US20170292149A1 - Methods using randomer-containing synthetic molecules - Google Patents

Methods using randomer-containing synthetic molecules Download PDF

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US20170292149A1
US20170292149A1 US15/123,397 US201515123397A US2017292149A1 US 20170292149 A1 US20170292149 A1 US 20170292149A1 US 201515123397 A US201515123397 A US 201515123397A US 2017292149 A1 US2017292149 A1 US 2017292149A1
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oligonucleotide
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Anna M. Sherwood
Ryan O. Emerson
Harlan S. Robins
Mark J. RIEDER
Joe PARSONS
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Adaptive Biotechnologies Corp
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Definitions

  • the adaptive immune system protects higher organisms against infections and other pathological events that may be attributable to foreign substances, using adaptive immune receptors, the antigen-specific recognition proteins that are expressed by hematopoietic cells of the lymphoid lineage and that are capable of distinguishing self from non-self molecules in the host.
  • These lymphocytes may be found in the circulation and tissues of a host, and their recirculation between blood and the lymphatics has been described, including their extravasation via lymph node high endothelial venules, as well as at sites of infection, inflammation, tissue injury and other clinical insults.
  • the dynamic nature of movement by lymphocytes throughout a host organism is reflected in changes in the qualitative (e.g., antigen-specificity of the clonally expressed adaptive immune receptor (immunoglobulin or T cell receptor), T cell versus B cell, T helper (T h ) cell versus T regulatory (T reg ) cell, effector T cell versus memory T cell, etc.) and quantitative distribution of lymphocytes among tissues, as a function of changes in host immune status.
  • T cell receptor immunoglobulin or T cell receptor
  • T cell versus B cell T helper (T h ) cell versus T regulatory (T reg ) cell
  • T reg T regulatory
  • effector T cell versus memory T cell etc.
  • tumor infiltrating lymphocytes TIL
  • tumor infiltrating T cells having a specific phenotype e.g., CD8 + and CD4 + T cells or regulatory T cells
  • TIL count alone is a predictor of long-term survival (e.g., Katz et al., 2009 Ann. Surg. Oncol. 16:2524-2530).
  • TIL counts has high prognostic value in a variety of cancers including colorectal, hepatocellular, gallbladder, pancreatic, esophageal, ovarian endometrial, cervical, bladder and urothelial cancers. While more is known about the association of tumor-infiltrating T cells, B cells are also known to infiltrate tumors and studies have shown an association of tumor-infiltrating B cells with survival advantage (e.g., Ladinyi, et al., Cancer Immunol. Immunother. 60(12):1729-38, Jul. 21, 2011 (epub ahead of print).
  • the quantitative determination of the presence of adaptive immune cells may therefore provide useful information for diagnostic, prognostic and other purposes, such as in cancer, infection, inflammation, tissue injury and other conditions.
  • adaptive immune cells e.g., T and B lymphocytes
  • the adaptive immune system employs several strategies to generate a repertoire of T- and B-cell antigen receptors with sufficient diversity to recognize the universe of potential pathogens.
  • B lymphocytes mature to express antibodies (immunoglobulins, Igs) that occur as heterodimers of a heavy (H) a light (L) chain polypeptide, while T lymphocytes express heterodimeric T cell receptors (TCR).
  • TCR T cell antigen receptor
  • TCR T cell antigen receptor
  • the proteins which make up these chains are encoded by DNA, which employs a unique mechanism for generating the tremendous diversity of the TCR
  • This multi-subunit immune recognition receptor associates with the CD3 complex and binds to peptides presented by the major histocompatibility complex (MHC) class I and II proteins on the surface of antigen-presenting cells (APCs). Binding of TCR to the antigenic peptide on the APC is the central event in T cell activation, which occurs at an immunological synapse at the point of contact between the T cell and the APC.
  • MHC major histocompatibility complex
  • APCs antigen-presenting cells
  • Each TCR peptide contains variable complementarity determining regions (CDRs), as well as framework regions (FRs) and a constant region.
  • CDRs variable complementarity determining regions
  • FRs framework regions
  • the sequence diversity of ⁇ T cells is largely determined by the amino acid sequence of the third complementarity-determining region (CDR3) loops of the ⁇ and ⁇ chain variable domains, which diversity is a result of recombination between variable (V ⁇ ), diversity (D ⁇ ), and joining (J ⁇ ) gene segments in the ⁇ chain locus, and between analogous V ⁇ and J ⁇ gene segments in the ⁇ chain locus, respectively.
  • V ⁇ variable
  • D ⁇ diversity
  • J ⁇ joining
  • CDR3 sequence diversity is further increased by independent addition and deletion of nucleotides at the V ⁇ -D ⁇ , D ⁇ -J ⁇ , and V ⁇ -J ⁇ junctions during the process of TCR gene rearrangement.
  • immunocompetence is reflected in the diversity of TCRs.
  • the ⁇ TCR is distinctive from the ⁇ TCR in that it encodes a receptor that interacts closely with the innate immune system.
  • TCR ⁇ is expressed early in development, has specialized anatomical distribution, has unique pathogen and small-molecule specificities, and has a broad spectrum of innate and adaptive cellular interactions.
  • a biased pattern of TCR ⁇ V and J segment expression is established early in ontogeny as the restricted subsets of TCR ⁇ cells populate the mouth, skin, gut, vagina, and lungs prenatally. Consequently, the diverse TCR ⁇ repertoire in adult tissues is the result of extensive peripheral expansion following stimulation by environmental exposure to pathogens and toxic molecules.
  • Igs expressed by B cells are proteins consisting of four polypeptide chains, two heavy chains (H chains) and two light chains (L chains), forming an H 2 L 2 structure.
  • Each pair of H and L chains contains a hypervariable domain, consisting of a V L and a V H region, and a constant domain.
  • the H chains of Igs are of several types, ⁇ , ⁇ , ⁇ , ⁇ , and ⁇ .
  • the diversity of Igs within an individual is mainly determined by the hypervariable domain.
  • the V domain of H chains is created by the combinatorial joining of the V H , D H , and J H gene segments.
  • Hypervariable domain sequence diversity is further increased by independent addition and deletion of nucleotides at the V H -D H , D H -J H , and V H -J H junctions during the process of Ig gene rearrangement. In this respect, immunocompetence is reflected in the diversity of Igs.
  • Multiplex PCR and sequencing of DNA molecules present major concerns for quantitative data analysis.
  • the first concern involves measurement and correction of uneven PCR amplification, attributable to the different primers present in the multiplex amplification scheme.
  • Current methods of addressing this concern include measuring the amplification bias attributable to each primer in the multiplex PCR using test molecules that are amplified and sequenced separately, and then using the resulting information to correct sequencing output in subsequent reactions.
  • the second concern involves quantitation of the number of molecules of each unique type present in the input sample, as opposed to the relative frequencies produced by raw DNA sequencing data. While standard measures of the number of input nucleic acids, like A260 absorbance, can provide a crude estimate of the number of total cells, this value cannot always be trusted if samples poorly handled or treated with preserving agents, such as formalin. Both formalin and the passage of time can fragment DNA, making it difficult to estimate the number of amplifiable genomes in a sample. Methods and systems are needed for estimating the total number of usable genomes added to a PCR reaction.
  • the state of the art for addressing this concern involves comparing the number of sequencing reads observed in an experiment to an estimate of the number of starting test molecules included in the reaction, generating a mean coverage that can be used to estimate the number of starting templates attributable to non-test molecules.
  • adaptive immune cells Quantitative characterization of adaptive immune cells based on the presence in such cells of functionally rearranged Ig and TCR encoding genes that direct productive expression of adaptive immune receptors has been achieved using biological samples from which adaptive immune cells can be readily isolated in significant numbers, such as blood, lymph or other biological fluids. In these samples, adaptive immune cells occur as particles in fluid suspension. See, e.g., US 2010/0330571; see also, e.g., Murphy, Janeway's Immunobiology (8 th Ed.), 2011 Garland Science, NY, Appendix I, pp. 717-762.
  • Previous methods include quantification of the relative representation of adaptive immune cells in a sample by amplifying V-region polypeptides, J-region polypeptides, and an internal control gene from the sample, and comparing the number of cells containing V- and J-region polypeptides to the number of cells containing the internal control gene. See, e.g., U.S. Ser. No. 13/656,265.
  • this method does not allow for absolute quantitation of the adaptive immune cells in the sample.
  • a relative representation of the adaptive immune cells can be determined, current methods do not allow determination of the absolute number of adaptive immune cells in the input sample.
  • the methods of the invention address the previously stated concerns by using synthetic molecules that are intended to be directly included in amplification and sequencing reactions of a sample, and whose quantity in the reaction (the exact number of molecules) can be precisely measured to improve the accuracy of multiplex PCR amplification bias correction and absolute input template quantitation, while alleviating the need for any extrinsic data to guarantee accurate and quantitative results.
  • Amplification bias is described further in International Application No. PCT/US2013/040221, filed on May 8, 2013, which is incorporated by reference in its entirety.
  • a method for determining and correcting for amplification bias in a PCR reaction of a sample.
  • the method provides amplifying by multiplex PCR and sequencing rearranged T cell receptor loci (TCRs) from T cells or immunoglobulin (Ig) loci from V cells in a sample to obtain a total number of output biological sequences.
  • TCRs T cell receptor loci
  • Ig immunoglobulin loci from V cells in a sample to obtain a total number of output biological sequences.
  • methods are provided for amplifying by multiplex PCR and sequencing a set of synthetic templates each comprising one TCR or Ig V segment and one TCR of Ig J or C segment and a unique bar code which identifies said synthetic template as synthetic.
  • each synthetic template comprises a unique combination of V and J or C segments, universal forward and/or reverse priming adaptor sequences, one or more barcodes that identify the template molecules as synthetic, an internal marker oligonucleotide sequence, and a string of random oligonucleotides.
  • the string of random oligonucleotides comprises a unique nucleotide sequence.
  • each synthetic template comprises a unique combination of V segments and J segments.
  • the method comprises clustering and identifying the resulting sequencing reads through extraction of the reads and comparison of the reads against the clustered synthetic template sequences to match read sequences with clustered synthetic template sequences. Those sequencing reads that are identified as synthetic template sequences are collapsed together if they share the same random oligonucleotide sequence.
  • the number of reads of each unique synthetic template and the V and J segments are identified, and a mean read count for each unique V segment and each reference J segment associated with said V segment is calculated and a mean read count list is compiled for each particular V segment.
  • an overall mean of the mean read counts from all unique V segments and reference J segments is calculated and the mean read count for each V/J segment combination is divided by the overall mean of mean read counts to arrive at an amplification factor for the V segment and corresponding reference J segment.
  • the normalization factor for a given V segment is produced by calculating the reciprocal of the mean of the amplification factors for each V segment across different reference J genes.
  • the normalization factor for the J segments is calculated for each J segment and corresponding reference V segment as previously described for V segments. The calculated normalization factor for each V segment and J segment is them applied to the number of output biological sequences for each V segment and J segment.
  • the step of comparing the sequencing reads against the clustered synthetic template sequences is performed with the Hammering metric. In a further embodiment, the step of comparing the remaining unmatched sequence reads against the clustered synthetic template sequences is performed with the Levenshtein metric.
  • the sample may be obtained from a mammalian subject.
  • the sample may comprise a mixture of T cells and/or B cells, as well as cells that are not T cells or B cells.
  • the sample may comprise somatic tissue or comprise a tumor biopsy.
  • the sample may comprise cells from humans, rats or mice
  • the method includes synthetic templates which comprise the sequence, 5′-U1-B1-V-I-B2-N-J-B3-U2-3′.
  • V is an oligonucleotide sequence comprising at least 20 and not more than 1000 contiguous nucleotides of a TCR or Ig variable (V) region encoding gene sequence or the complement thereof.
  • each synthetic template comprises a unique V region oligonucleotide sequence.
  • J is an oligonucleotide sequence comprising at least 15 and not more than 600 contiguous nucleotides of a TCR or Ig joining (J) region encoding gene sequence or the complement thereof.
  • U1 comprises an oligonucleotide sequence that is a first universal adaptor sequence or a first sequencing platform oligonucleotide sequence that is linked to and positioned 5′ to a first universal adaptor oligonucleotide sequence.
  • U2 comprises an oligonucleotide sequence that is a universal adaptor sequence or a second sequencing platform oligonucleotide sequence that is linked to and positioned 5′ to a second universal adaptor oligonucleotide sequence.
  • I is an internal marker oligonucleotide sequence comprising at least 2 and not more than 100 nucleotides.
  • N is a random oligonucleotide sequence comprising at least 2 and not more than 100 nucleotides.
  • B1, B2 and B3 are each independently, either nothing or an oligonucleotide barcode sequence of at least 2 and not more than 100 nucleic acids that uniquely identifies as a pair combination a unique V region oligonucleotide sequence and a unique J region oligonucleotide.
  • at least one B1, B2 and B3 is present in each synthetic template.
  • at least two of B1, B2 and B3 are present in each synthetic template.
  • all three of B1, B2 and B3 are present in each synthetic template.
  • the synthetic templates comprise a string of random oligonucleotides comprising at least 4 and not more than 15 nucleotides. In one embodiment, the string of random oligonucleotides comprises at least 4 and not more than 50 nucleotides. In one embodiment, the random stretch of oligonucleotides comprises about 8 oligonucleotides. In one embodiment, the random oligonucleotides comprise about 12 oligonucleotides.
  • amplification of the rearranged TCR or Ig loci and first set of synthetic templates is done using a plurality of oligonucleotide primers.
  • the oligonucleotide primers comprise a plurality of V segment oligonucleotide primers that are each independently capable of specifically hybridizing to at least one polynucleotide encoding a TCR of Ig V region polypeptide or to the complement thereof.
  • each V segment primer comprises a nucleotide sequence of at least 15 contiguous nucleotides that is complementary to at least one functional a TCR or Ig V region encoding gene segment.
  • the plurality of V segment primers specifically hybridize to substantially all functional TCR or Ig V region encoding gene segments that are present in the composition.
  • the plurality of primers further includes a plurality of J segment oligonucleotide primers that are each independently capable of specifically hybridizing to at least one polynucleotide encoding a TCR or Ig J region polypeptide or to the complement thereof.
  • each J segment primer comprises a nucleotide sequence of at least 15 contiguous nucleotides that is complementary to at least one functional TCR or Ig J region encoding gene segment.
  • the plurality of J segment primers specifically hybridize to substantially all functional TCR or Ig J region encoding gene segments that are present in the composition.
  • the plurality of V segment oligonucleotide primers and said plurality of J-segment oligonucleotide primers comprise the sequences set forth in SEQ ID NOs: 1-764.
  • the plurality of V segment oligonucleotide primers comprise sequences having at least 90% sequence identity to nucleotide sequences set forth in SEQ ID NOs: 1-120, 147-158, 167-276, 407-578, and 593-740
  • the plurality of J segment oligonucleotide primers comprise sequences having at least 90% sequence identity to nucleotide sequences set forth in SEQ ID NOs: 121-146, 159-166, 277-406, 579-592, and 741-764.
  • the sample is tumor biopsy.
  • the TCR V segment comprises a TCR VS segment, a TCR V ⁇ segment, a TCR V ⁇ segment, or a TCR V ⁇ segment.
  • the TCR J segment comprises a TCR J ⁇ segment, a TCR J ⁇ segment, a TCR J ⁇ segment, or a TCR J ⁇ segment.
  • the Ig V segment comprises an IGH V gene segment, an IGL V gene segment, or an IGK V gene segment.
  • the Ig J region segment comprises an IGH J gene segment, an IGL J gene segment, or an IGK V gene segment.
  • the output sequences obtained are each about 100 to 300 nucleotides in length.
  • the synthetic template molecules can include oligonucleotide sequences that are complementary to a target molecule, a random oligonucleotide sequence of length N, and a unique barcode sequence.
  • the random oligonucleotide sequences can be randomly generated during synthesis of the molecule.
  • methods are provided for estimating the number of input genomes in a sample.
  • the method involves amplifying by multiplex PCR and sequencing one or more biological sequences to obtain a total number of output biological sequences and as set of synthetic templates which contain one or more biological sequences corresponding the amplified biological sequences.
  • the set of synthetic templates include, in addition to the one or more corresponding biological sequences, a unique barcode that identifies the synthetic template(s) as synthetic and a stretch of random nucleic acids.
  • each member of the set of synthetic templates is represented only once in the amplified set.
  • an amplification factor is determined for each of the one or more biological sequences by dividing the total number of synthetic sequences amplified and sequenced by the total number input number of unique synthetic templates amplified and sequenced.
  • the number of input genomes in the sample is estimated by dividing the total number of output biological sequences for each of the one or more biological sequences amplified and sequenced by the corresponding amplification factor for that biological sequence.
  • the sample comprises T cells and/or B cells and provides an estimate of the number of total input T cells and/or B cell genomes.
  • the method includes amplifying by multiplex PCR and sequencing one or more rearranged CDR3 oligonucleotide sequences from T cell receptor (TCR loci) from T cells and or Immunoglobulin (Ig) loci from B cells.
  • TCR loci T cell receptor
  • Ig Immunoglobulin loci from B cells.
  • each CDR3 oligonucleotide sequence comprises a V segment and a J segment.
  • the total number of T cells and/or B cells is determined by adding the number of estimated genomes for each rearranged TCR and/or Ig loci.
  • the method includes amplifying by multiplex PCR and sequencing one or more genomic control regions. In one embodiment, the method includes amplifying by multiplex PCR and sequencing two or more genomic control regions. In one embodiment, the method includes amplifying by multiplex PCR and sequencing three or more genomic control regions. In one embodiment, the method includes amplifying by multiplex PCR and sequencing four or more genomic control regions. In one embodiment, the method includes amplifying by multiplex PCR and sequencing five or more genomic control regions.
  • the method includes amplifying by multiplex PCR and sequencing one or more of ACTB, B2M, Clorf34, CHMP2A, GPI, GUSB, HMBS, HPRT1, PSMB4, RPL13A, RPLP0, SDHA, SNRPD3, UBC, VCP, VPS29, PPIA, PSMB2, RAB7A, UBC, VCP, REEP5 and EMC7.
  • the method includes amplifying by multiplex PCR and sequencing PSMB2, RAB7A, PPIA, REEP5, and EMC7.
  • the total number of input genomes is calculated by taking an average using each of the five amplification factors determined for each of PSMB2, RAB7A, PPIA, REEP5, and EMC7 amplified and sequenced. In a further embodiment, the highest and lowest calculated number of input genomes is discarded prior to taking the average.
  • the method involves amplifying by multiplex PCR and sequencing a set of synthetic templates of formula I: 5′-U1-B1-V-B2-J-B3-U2-3′.
  • V is an oligonucleotide sequence comprising at least 20 and not more than 1000 contiguous nucleotides of a TCR or Ig variable (V) region encoding gene sequence, or the complement thereof and each template in set first set of synthetic templates having a unique V-region oligonucleotide sequence.
  • J is an oligonucleotide sequence comprising at least 15 and not more than 600 contiguous nucleotides of a TCR or Ig joining (J) region encoding gene sequence, or the complement thereof and each template in said first set of synthetic templates comprising a unique J-region oligonucleotide sequence.
  • U1 comprises an oligonucleotide sequence that is selected from (i) a first universal adaptor oligonucleotide sequence; and (ii) a first sequencing platform oligonucleotide sequence that is linked to and positioned 5′ to a first universal adaptor oligonucleotide sequence.
  • U2 comprises an oligonucleotide sequence that is selected from (i) a second universal adaptor oligonucleotide sequence; and (ii) a second sequencing platform oligonucleotide sequence that is linked to and positioned 5′ to a second universal adaptor oligonucleotide sequence.
  • B1, B2 and B3 each independently comprise either nothing or an oligonucleotide barcode sequence of 3-25 nucleic acids that uniquely identifies, as a pair combination (i) said unique V-region oligonucleotide sequence; and said unique J-region oligonucleotide, %% herein at least one of B1.
  • the synthetic templates each comprises a stretch of unique random nucleotides.
  • the random stretch of nucleotides comprise from 4 to 50 nucleotides. In a further embodiment, the random stretch of nucleotides comprises 8 nucleotides.
  • a method for determining the ratio of T or B cells in a sample relative to the total number of input genomes.
  • the method provides amplifying by multiplex PCR and sequencing rearranged T cell receptor loci (TCRs) from T cells or immunoglobulin (Ig) loci from V cells in a sample to obtain a total number of output biological sequences.
  • TCRs T cell receptor loci
  • Ig immunoglobulin loci from V cells in a sample to obtain a total number of output biological sequences.
  • methods are provided for amplifying by multiplex PCR and sequencing a first set of synthetic templates each comprising one TCR or Ig V segment and one TCR of Ig J or C segment and a unique bar code which identifies said synthetic template as synthetic.
  • each synthetic template comprises a unique combination of V and J or C segments.
  • the method provides determining an amplification factor for each synthetic template that is represented by the total number of first synthetic templates amplified and sequenced divided by the total input number of unique first synthetic templates. In one embodiment, the method provides for determining the total number of T cells or B cells in the sample by dividing the total number of output biological sequences by the amplification factor corresponding to that biological sequence.
  • the method further provides amplifying by multiplex PCR and sequencing one or more genomic control regions from DNA obtained from a sample to obtain the total number of output biological sequences for each genomic control region.
  • methods are provided for amplifying by multiplex PCR and sequencing a second set of synthetic templates, each comprising the sequence of one or more of said genomic control regions, a unique barcode and stretch of random nucleic acids.
  • each synthetic template in the second set of synthetic templates is represented only once.
  • the method provides for determining an amplification factor for each of the one or more genomic control regions by dividing the total number of second synthetic templates amplified and sequenced by the total input number of unique second synthetic templates.
  • the method further provides for a method for determining the total number of input genomes by dividing the total number of output biological sequences from each genomic control region by the corresponding amplification factor for that genomic control region.
  • the sample is obtained from a mammalian subject.
  • the sample comprises a mixture of cells comprising T cells and/or B cells and cells that are not Tc ells and/or B cells.
  • the total number of synthetic templates in the first set of synthetic templates subject to amplification is used to determined using a limiting dilution of said synthetic templates each comprising a unique TCR of Ig V and J or C region such that each unique synthetic template is found in single copy.
  • the total number of synthetic templates in the first set of synthetic templates subject to amplification is determined by counting the number of unique synthetic templates based on unique random nucleotides contained in each synthetic template.
  • the method provides for amplification of two or more genomic control regions. In another embodiment, the method provides for amplification of three or more genomic control regions. In yet another embodiment, the method provides for amplification of four or more genomic control regions. In still another embodiment, the method provides for amplification of five or more genomic control regions. In one embodiment, the method provides for amplification of five genomic control regions and calculating amplification factors for each. In one embodiment, the average amplification factor is determined by taking the average of amplification factors for each genomic control region. In one embodiment, the highest and lowest genomic control region amplification factor is discarded prior to taking an average.
  • the genomic control regions are one or more of PPIA, PSMB2, RAB7A, UBC, VCP, REEP5, EMC7, VPS29, SNRPD3, SDHA, RPLPO, RPL13A, PSMB4, HPRT1, HMBS, GUSB, GPI, CHMP2A, Clorf43, B2M, and ACT3.
  • the genomic control regions are PSMB2, RAB7A, PPIA, REEP5, and EMC7.
  • the multiplex PCR and sequencing of rearranged TCR or Ig loci and first synthetic templates are done in one multiplex PCR reaction while the amplification of the genomic control regions and second set of synthetic templates are done in a second multiplex PCR reaction.
  • the rearranged TCR and or Ig loci, the first set of synthetic templates, the genomic control regions and second set of synthetic templates are amplified and sequenced in the same multiplex PCR reaction.
  • amplification of the rearranged TCR or Ig loci and first set of synthetic templates is done using a plurality of oligonucleotide primers.
  • the oligonucleotide primers comprise a plurality of V segment oligonucleotide primers that are each independently capable of specifically hybridizing to at least one polynucleotide encoding a TCR of Ig V region polypeptide or to the complement thereof.
  • each V segment primer comprises a nucleotide sequence of at least 15 contiguous nucleotides that is complementary to at least one functional a TCR or Ig V region encoding gene segment.
  • the plurality of V segment primers specifically hybridize to substantially all functional TCR or Ig V region encoding gene segments that are present in the composition.
  • the plurality of primers further includes a plurality of J segment oligonucleotide primers that are each independently capable of specifically hybridizing to at least one polynucleotide encoding a TCR or Ig J region polypeptide or to the complement thereof.
  • each J segment primer comprises a nucleotide sequence of at least 15 contiguous nucleotides that is complementary to at least one functional TCR or Ig J region encoding gene segment.
  • the plurality of J segment primers specifically hybridize to substantially all functional TCR or Ig J region encoding gene segments that are present in the composition.
  • the plurality of V segment oligonucleotide primers and said plurality of J-segment oligonucleotide primers comprise the sequences set forth in SEQ ID NOs: 1-764. In one embodiment, the plurality of V segment oligonucleotide primers comprise sequences having at least 90% sequence identity to nucleotide sequences set forth in SEQ ID NOs: 1-120, 147-158, 167-276, 407-578, and 593-740, and/or the plurality of J segment oligonucleotide primers comprise sequences having at least 90% sequence identity to nucleotide sequences set forth in SEQ ID NOs: 1-120, 147-158, 167-276, 407-578, and 593-740.
  • the sample is fresh, frozen or fixed tissue.
  • the sample comprises human cells, mouse cells or rat cells.
  • the sample comprises somatic tissue.
  • the sample is tumor biopsy.
  • the TCR V segment comprises a TCR VS segment, a TCR V ⁇ segment, a TCR V ⁇ segment, or a TCR V ⁇ segment.
  • the TCR J segment comprises a TCR J ⁇ segment, a TCR J ⁇ segment, a TCR J ⁇ segment, or a TCR J ⁇ segment.
  • the Ig V segment comprises an IGH V gene segment, an IGL V gene segment, or an IGK V gene segment.
  • the Ig J region segment comprises an IGH J gene segment, an IGL J gene segment, or an IGK V gene segment.
  • the biological output sequences for the TCR or Ig loci and the synthetic templates contained in the first set of synthetic templates are each about 100-300 nucleotides in length. In another embodiment, the output sequences for each genomic control region and the synthetic templates contained in the second set of synthetic templates are each about 100-300 nucleotides in length. In still another embodiment, the biological output sequences for the TCR or Ig loci, the synthetic templates contained in the first set of synthetic templates, the output sequences for each genomic control region and the synthetic templates contained in the second set of synthetic templates are each about 100-300 nucleotides in length.
  • an amplification factor is determined for (i) a plurality of biological rearranged nucleic acid molecules encoding an adaptive immune receptor comprising a T-cell receptor (TCR) or Immunoglobulin (Ig) from said biological sample, each biological rearranged nucleic acid molecule comprising a unique variable (V) region encoding gene segment and a unique joining (J) region encoding gene segment, and (ii) a plurality of synthetic template oligonucleotide molecules, each comprising a paired combination of a unique V region gene segment and a unique J region gene segment found in one of the plurality of biological rearranged nucleic acid molecules.
  • TCR T-cell receptor
  • Ig Immunoglobulin
  • a total number of input biological rearranged nucleic acid molecules is determined by comparing the number of output sequences of biological rearranged nucleic acid molecules obtained from sequencing of amplified biological rearranged nucleic acid molecules produced from said multiplex PCR with said amplification factor.
  • the relative representation of adaptive immune cells is determined by comparing said number of input biological rearranged nucleic acid molecules with said number of total input biological nucleic acid molecules.
  • determining said amplification factor comprises dividing (1) said number of output synthetic template oligonucleotide sequences obtained from sequencing of amplified synthetic template oligonucleotide molecules generated from the multiplex PCR by (2) said number of input synthetic template oligonucleotides added to said multiplex PCR.
  • determining a number of input biological rearranged nucleic acid molecules comprises dividing (1) a total number of output sequences of biological rearranged nucleic acid molecules obtained from sequencing of amplified biological rearranged nucleic acid molecules produced from said multiplex PCR by (2) said amplification factor.
  • comparing said number of input biological rearranged nucleic acid molecules with said number of total input biological nucleic acid molecules comprises dividing number of input biological rearranged nucleic acid molecules by said the number of total input biological nucleic acid molecules.
  • said number of input synthetic template oligonucleotides added in said multiplex PCR is determined by amplifying an undiluted synthetic template oligonucleotide pool using simplex PCR to obtain a plurality of synthetic template amplicons, sequencing said plurality of synthetic template amplicons to determine a frequency of each unique synthetic template oligonucleotide in the pool, quantifying a relationship based on in silico simulations of said frequency of each unique synthetic template oligonucleotide in the pool, between a total number of unique observed synthetic template oligonucleotide sequences in a subset of the pool and the number of total synthetic template oligonucleotides present in said subset, and determining a number of input total synthetic template oligonucleotides in said multiplex PCR, said multiplex PCR including a limiting dilution of said synthetic template oligonucleotide pool, said determination based on the number of unique synthetic template oligonucleotides observed in the sequencing
  • said number of input synthetic template oligonucleotides added in said multiplex PCR is further determined by adding a known quantity of said pool of diluted synthetic template oligonucleotides to said multiplex PCR to produce a number of amplified total synthetic template oligonucleotides.
  • said multiplex PCR is performed using a plurality of oligonucleotide primer sets comprising: (a) a plurality of V segment oligonucleotide primers that are each independently capable of specifically hybridizing to at least one polynucleotide encoding an adaptive immune receptor V region polypeptide or to the complement thereof, wherein each V segment primer comprises a nucleotide sequence of at least 15 contiguous nucleotides that is complementary to at least one functional adaptive immune receptor V region encoding gene segment and wherein said plurality of V segment primers specifically hybridize to substantially all functional adaptive immune receptor V region encoding gene segments that are present in the composition, and (b) a plurality of J segment oligonucleotide primers that are each independently capable of specifically hybridizing to at least one polynucleotide encoding an adaptive immune receptor J region polypeptide or to the complement thereof, wherein each J segment primer comprises a nucleotide sequence of at least 15 contiguous nucleotides that
  • said plurality of synthetic template oligonucleotide molecules comprises a number of at least a or at least b unique oligonucleotide sequences, whichever is larger, wherein a is the number of unique adaptive immune receptor V region-encoding gene segments in the subject and b is the number of unique adaptive immune receptor J region-encoding gene segments in the subject.
  • a ranges from 1 to a number of maximum V gene segments in the genome of said mammalian subject.
  • b ranges from 1 to a number of maximum J gene segments in the genome of said mammalian subject.
  • said plurality of synthetic template oligonucleotide molecules comprises at least one synthetic template oligonucleotide sequence for each unique V region oligonucleotide sequence and at least one synthetic template oligonucleotide sequence for each unique J region oligonucleotide sequence.
  • said adaptive immune cells are T cells or B cells.
  • said biological sample is fresh tissue, frozen tissue, or fixed tissue, and said biological sample comprises human cells, mouse cells, or rat cells. In further embodiments, said biological sample comprises somatic tissue.
  • said V region encoding gene segment comprises a TCR VS segment, a TCR V ⁇ segment, a TCR V ⁇ segment, or a TCR V ⁇ segment.
  • said J region encoding gene segment comprises a TCR J ⁇ segment, a TCR J ⁇ segment, a TCR J ⁇ segment, or a TCR J ⁇ segment.
  • said V region encoding gene segment comprises an IGH V gene segment, an IGL V gene segment, or an IGK V gene segment.
  • said J region encoding gene segment comprises an IGH J gene segment, an IGL J gene segment, or an IGK V gene segment.
  • said plurality of synthetic template oligonucleotide sequences comprise sequences selected from SEQ ID NOs: 707-3003.
  • V of formula (I) is an oligonucleotide sequence comprising at least 30, 60, 90, 120, 150, 180, or 210, or not more than 900, 800, 700, 600, or 500 contiguous nucleotides of an adaptive immune receptor V region encoding gene sequence, or the complement thereof.
  • J of formula (I) is an oligonucleotide sequence comprising at least 16-30, 31-60, 61-90, 91-120, or 120-150, or not more than 500, 400, 300, or 200 contiguous nucleotides of an adaptive immune receptor J region encoding gene sequence, or the complement thereof.
  • J of formula (I) comprises a sequence comprising a constant region of J region encoding gene sequence.
  • each synthetic template oligonucleotide sequence is less than 1000, 900, 800, 700, 600, 500, 400, 300 or 200 nucleotides in length.
  • kits comprising reagents comprising a composition comprising a plurality of synthetic template oligonucleotides and a set of oligonucleotide primers as described above, and instructions for quantifying a relative representation of adaptive immune cells in a biological sample that comprises a mixture of cells comprising adaptive immune cells and cells that are not adaptive immune cells, by quantifying: (i) a synthetic template product number of amplified synthetic template oligonucleotide molecules, and (ii) a biological rearranged product number of a number of output sequences.
  • FIG. 1 depicts two of many envisioned embodiments of synthetic template molecules of the present disclosure.
  • Universal adaptors may be used to characterize synthetic templates with the use of primers tailed with the universal and Illumina adaptors and sequenced with illumine adaptors ( FIG. 1 a ).
  • the use of VF and JR multiplex PCR primers may be used to characterize the sequences that fall between, and including, the V and J genes ( FIG. 1 b ).
  • FIG. 2 depicts PCR amplification of vBlocks and gBlocks in two separate runs. Each point represents the average amplification bias observed for synthetic templates with a given V gene (darker shade) or J gene (lighter shade). The legend on each plot shows the squared Pearson correlation (R 2 ) between amplification bias measurements from vBlocks and gBlocks. The correlation is stronger in the left-hand plot because PCR Run1 included a larger number of vBlocks.
  • FIG. 3 depicts measurements of amplification bias as consistent across different “Reference” V and J genes (Ref 1 and Ref 2) in both PCR experiments (runs).
  • each point represents the average amplification bias observed for synthetic templates with a given V gene (darker shade) or J gene (lighter shade).
  • the squared Pearson correlations (R 2 ) were computed between amplification bias measurements from different reference V and J genes in a given PCR run. The correlation is stronger in the left-hand plot as PCR Run 1 included a larger number of vBlocks.
  • FIG. 4 depicts both vBlocks and gBlocks as producing stable measurements of amplification bias across different PCR experiments (runs). Each point represents the average amplification bias observed for synthetic templates with a given V gene (darker shade) or J gene (lighter shade).
  • R 2 squared Pearson correlations
  • FIG. 5 depicts organization of synthetic controls for measuring relative input sequences in a biological sample, wherein the random nucleotide sequence and the barcode are, in one embodiment, are linked together and flanked by sequences of a chosen housekeeping gene.
  • FIG. 6 depicts the methods of the current invention utilizing genomic control regions as able to accurately calculate the number of input genomes and number of T cells based on the number of input sequences.
  • Methods of the disclosure are provided for accurate determination and correction of amplification bias in multiplex amplification of V and/or J segments of adaptive immune cells. Methods and compositions are provided for determining the number of input genomes from adaptive immune cells in a complex mixture of cells. In addition, the present disclosure relates to methods for quantitative determination of lymphocyte presence in complex tissues, such as solid tissues.
  • the methods of the invention also include a quantification of the relative representation of tumor-infiltrating lymphocyte (TIL) genomes as a relative proportion of all cellular genomes that are represented in a sample, such as a solid tissue or solid tumor sample, or quantification of the genomes of lymphocytes that have infiltrated somatic tissue in the pathogenesis of inflammation, allergy or autoimmune disease or in transplanted organs as a relative proportion of all cellular genomes that are represented in a tissue DNA sample.
  • TIL tumor-infiltrating lymphocyte
  • compositions of the invention include primer pairs that amplify a region of the genome and a synthetic template that includes primer-annealing sites and a sequence tag identifying the template as synthetic.
  • the primer pairs amplify the genomic region and the synthetic templates with the same efficacy, resulting in a mixed library that includes amplicons of both the synthetic and biologic templates.
  • Synthetic templates are described further in International Application No. PCT/US2013/040221, filed on May 8, 2013, U.S. Ser. No. 61/644,294, filed on May 8, 2012, U.S. Ser. No. 61/726,489, filed on Nov. 14, 2012, which are each incorporated by reference in its entirety.
  • primer pairs of primers to amplify conserved regions of the genome are understood by one of skill in the art (e.g., those trained in molecular biology). Specifically, an optimal primer pair amplifies a conserved region of the genome, specifically avoiding regions that have common single nucleotide polymorphisms and copy number variants. Additionally, researchers may desire primers to amplify one region of the genome, but as long as the primer pairs consistently amplify the same number of regions whether one or two or three, the assay can work.
  • primer pairs should amplify a region of the genome that is approximately the same size as the region of interest. For example, we have targeted a region of interest in the CDR3 regions of rearranged TRB chains. This region of interest is only carried by T lymphocytes, not all cell types.
  • compositions and methods that are useful for reliably quantifying and determining the sequences of large and structurally diverse populations of rearranged genes encoding adaptive immune receptors, such as immunoglobulins (IG) and/or T cell receptors (TCR).
  • IG immunoglobulins
  • TCR T cell receptors
  • rearranged genes may be present in a biological sample containing DNA from lymphoid cells of a subject or biological source, including a human subject, and/or mRNA transcripts of these rearranged genes may be present in such a sample and used as templates for cDNA synthesis by reverse transcription.
  • Methods are provided for quantifying an amount of synthetic template oligonucleotides in a sample to determine a total number of input genomes from adaptive immune cells in a biological sample.
  • a sample of synthetic template oligonucleotides is used to determine a ratio of the number of input synthetic template oligonucleotide molecules compared with the number of total output (amplicon) synthetic template oligonucleotides.
  • a limiting dilution of this sample is spiked-in to a biological sample (at the start of a multiplex PCR assay) and used to determine the total number of input genomes from adaptive immune cells in the biological sample.
  • the synthetic templates in the sample comprise a stretch of random nucleic acids, for example an 8 nucleotide randomer. Therefore, limiting dilutions can be made such that each synthetic template in the sample is present only once and can be identified by the 8 nucleotide randomer contained therein.
  • the invention is not limited by the use of an 8 nucleotide randomer, however. Randomers of various lengths, for example 4-15, or more nucleotides may be used in accordance with the methods of the current invention.
  • the method also includes determining the relative representation of adaptive immune cells in a sample that contains a mixture of cells, where the mixture comprises adaptive immune cells and cells that are not adaptive immune cells.
  • a relative representation of DNA from adaptive immune cells e.g., T and/or B lymphocytes having rearranged adaptive immune receptor genes, including T- and B-lineage cells of different maturational stages such as precursors, blast cells, progeny or the like
  • T and/or B lymphocytes having rearranged adaptive immune receptor genes including T- and B-lineage cells of different maturational stages such as precursors, blast cells, progeny or the like
  • certain embodiments permit determination, in DNA extracted from a biological sample, of the relative representation of DNA from tumor infiltrating lymphocytes (TIL) in the DNA from the biological sample, where the sample comprises all or a portion of a tumor that contains adaptive immune cells and cells that are not adaptive immune cells (including tumor cells).
  • TIL tumor infiltrating lymphocytes
  • Certain other embodiments permit determination, in DNA extracted from a biological sample, of the relative representation of DNA from infiltrating lymphocytes in the DNA from the biological sample, where the sample comprises all or a portion of a somatic tissue that contains adaptive immune cells and cells that are not adaptive immune cells, such as cells of a solid tissue.
  • Alternative methods of quantifying the relative representation of adaptive immune cells in a mixture of cells are disclosed in U.S. Ser. No. 13/656,265, filed on Oct. 21, 2012, and International App. No. PCT/US2012/061193, filed on Oct. 21, 2012, which are hereby incorporated by reference in their entireties.
  • compositions and methods are provided for quantifying the proportion of cellular genomes in a sample comprising nucleic acid molecules (e.g., DNA) that are contributed by adaptive immune cells relative to the total number of cellular genomes in the sample, starting from a DNA sample that has been extracted from a mixture of cell types, such as a solid tumor or a solid tissue.
  • nucleic acid molecules e.g., DNA
  • rearranged adaptive immune receptor nucleic acid molecules are amplified in a single multiplex PCR using rearranged adaptive immune receptor-specific oligonucleotide primer sets to produce adaptive immune cell-specific DNA sequences, which are used to determine the relative contribution of adaptive immune cells as compared to the total DNA extracted from a sample of mixed cell types.
  • rearranged adaptive immune cell mRNA molecules are amplified using rt-qPCR and rearranged adaptive immune receptor-specific oligonucleotide primer sets to quantify rearranged adaptive immune receptor cDNA signals and to determine the relative contribution of adaptive immune cells to the total number of genomes extracted from a sample of mixed cell types.
  • methods of the invention include using a real time quantitative polymerase chain reaction (qPCR) assay with oligonucleotide primer sets that specifically amplify substantially all rearranged adaptive immune receptor genes (e.g., CDR3 encoding polynucleotide-containing portions of rearranged T cell receptor and/or immunoglobulin genes) that may be present in a sample, to generate a first detectable DNA signal that quantitatively reflects the production of a multiplicity of amplified rearranged adaptive immune receptor encoding DNA molecules.
  • qPCR real time quantitative polymerase chain reaction
  • qPCR amplification may be monitored at one or a plurality of time points during the course of the qPCR reaction, i.e., in “real time”. Real-time monitoring permits determination of the quantity of DNA that is being generated by comparing a so-measured adaptive immune receptor-encoding DNA-quantifying signal to an appropriate synthetic template (or control template DNA) quantifying signal, which may be used as a calibration standard. Methods for quantification using qPCR are described in detail in U.S. application Ser. No. 13/656,265, filed on Oct. 21, 2012, International App. No. PCT/US2012/061193, filed on Oct. 21, 2012, which are each incorporated by reference in their entireties.
  • compositions and methods for the use of synthetic template oligonucleotides that are intended to be directly included in amplification and sequencing reactions of a sample, and whose quantity in the reaction (the number of molecules) can be precisely measured to improve the accuracy of multiplex PCR amplification bias correction and absolute input template quantitation.
  • Amplification bias is described further in WO/2013/169957 (PCT/US2013/040221) and Carlson, C. S. et al. Using synthetic templates to design an unbiased multiplex PCR assay, Nature Communications 4, 2680, doi: 10.1038/ncomms3680 (2013), both of which are each incorporated by reference in its entirety.
  • the present invention is directed in certain embodiments as described herein to quantification of DNA from adaptive immune cells that are present in solid tissues, and in particular embodiments, to solid tumors, such that the relative presence of adaptive immune cells as a proportion of all cell types that may be present in the tissue (e.g., tumor) can be determined.
  • tissue e.g., tumor
  • oligonucleotide primer sets permit production of amplified rearranged DNA molecules and synthetic template molecules that encode portions of adaptive immune receptors.
  • These and related embodiments feature the selection of a plurality of oligonucleotide primers that specifically hybridize to adaptive immune receptor (e.g., T cell receptor, TCR; or immunoglobulin, Ig) V-region polypeptide encoding polynucleotide sequences and J-region polypeptide encoding polynucleotide sequences.
  • adaptive immune receptor e.g., T cell receptor, TCR; or immunoglobulin, Ig
  • V-region polypeptide encoding polynucleotide sequences e.g., T cell receptor, TCR; or immunoglobulin, Ig
  • V-region polypeptide encoding polynucleotide sequences e.g., T cell receptor, TCR; or immunoglobulin, Ig
  • V-region polypeptide encoding polynucleotide sequences e.g., T cell receptor, TCR; or immunoglobulin, Ig
  • the primers promote PCR amplification of nucleic acid molecules, such as DNA, that include substantially all rearranged TCR CDR3-encoding or Ig CDR3-encoding gene regions that may be present in a test biological sample, where the sample contains a mixture of cells which comprises adaptive immune cells (e.g., T- and B-lymphocyte lineage cells) and cells that are not adaptive immune cells.
  • a cell mixture may be obtained from a solid tumor that comprises tumor cells and TILs.
  • the native TCR is a heterodimeric cell surface protein of the immunoglobulin superfamily, which is associated with invariant proteins of the CD3 complex involved in mediating signal transduction.
  • TCRs exist in ⁇ and ⁇ forms, which are structurally similar but have quite distinct anatomical locations and probably functions.
  • the MHC class I and class II ligands, which bind to the TCR, are also immunoglobulin superfamily proteins but are specialized for antigen presentation, with a highly polymorphic peptide binding site which enables them to present a diverse array of short peptide fragments at the APC cell surface.
  • the extracellular portions of native heterodimeric ⁇ and ⁇ TCRs consist of two polypeptides each of which has a membrane-proximal constant domain, and a membrane-distal variable domain. Each of the constant and variable domains includes an intra-chain disulfide bond.
  • the variable domains contain the highly polymorphic loops analogous to the complementarity determining regions (CDRs) of antibodies. CDR3 of ⁇ TCRs interact with the peptide presented by MHC, and CDRs 1 and 2 of ⁇ TCRs interact with the peptide and the MHC.
  • the diversity of TCR sequences is generated via somatic rearrangement of linked variable (V), diversity (D), joining (J), and constant genes.
  • the Ig and TCR gene loci contain many different variable (V), diversity (D), and joining (J) gene segments, which are subjected to rearrangement processes during early lymphoid differentiation.
  • Ig and TCR V, D and J gene segment sequences are known in the art and are available in public databases such as GENBANK.
  • the V-D-J rearrangements are mediated via a recombinase enzyme complex in which the RAG1 and RAG2 proteins play a key role by recognizing and cutting the DNA at the recombination signal sequences (RSS).
  • the RSS are located downstream of the V gene segments, at both sides of the D gene segments, and upstream of the J gene segments. Inappropriate RSS reduce or even completely prevent rearrangement.
  • the RSS consists of two conserved sequences (heptamer, 5′-CACAGTG-3′, and nonamer, 5′-ACAAAAACC-3′), separated by a spacer of either 12+/ ⁇ 1 bp (“12-signal”) or 23+/ ⁇ 1 bp (“23-signal”).
  • a number of nucleotide positions have been identified as important for recombination, including the CA dinucleotide at position one and two of the heptamer, and a C at heptamer position three has also been shown to be strongly preferred as well as an A nucleotide at positions 5, 6, 7 of the nonamer.
  • the rearrangement process generally starts with a D to J rearrangement followed by a V to D-J rearrangement in the case of Ig heavy chain (IgH).
  • the sequences between rearranging gene segments are generally deleted in the form of a circular excision product, also called TCR excision circle (TREC) or B cell receptor excision circle (BREC).
  • TCR excision circle also called TCR excision circle (TREC) or B cell receptor excision circle (BREC).
  • V, D, and J gene segments represent the so-called combinatorial repertoire, which is estimated to be ⁇ 2 ⁇ 10 6 for Ig molecules, ⁇ 3 ⁇ 10 6 for TCR ⁇ and 5 ⁇ 10 3 for TCR ⁇ molecules.
  • deletion and random insertion of nucleotides occurs during the rearrangement process, resulting in highly diverse junctional regions, which significantly contribute to the total repertoire of Ig and TCR molecules, estimated to be >10 12 .
  • Mature B-lymphocytes further extend their Ig repertoire upon antigen recognition in follicle centers via somatic hypermutation, a process, leading to affinity maturation of the Ig molecules.
  • the somatic hypermutation process focuses on the V-(D-) J exon of IgH and Ig light chain genes and concerns single nucleotide mutations and sometimes also insertions or deletions of nucleotides. Somatically-mutated Ig genes are also found in mature B-cell malignancies of follicular or post-follicular origin.
  • the term “gene” refers to a segment of DNA that can be expressed as a polypeptide chain.
  • the polypeptide chain can be all or a portion of a TCR or Ig polypeptide (e.g., a CDR3-containing polypeptide).
  • the gene can include regions preceding and following the coding region (“leader and trailer”), intervening sequences (introns) between individual coding segments (exons), regulatory elements (e.g., promoters, enhancers, repressor binding sites and the like), and recombination signal sequences (RSS's), as described herein.
  • nucleic acids or “nucleic acid molecules” or “polynucleotides” or “oligonucleotides” can be in the form of ribonucleic acids (RNA), or in the form of deoxyribonucleic acids (DNA).
  • RNA includes mRNA.
  • DNA includes cDNA, genomic DNA, and synthetic DNA. The DNA can be double-stranded or single-stranded, and if single stranded may be the coding strand or non-coding (anti-sense) strand.
  • a coding sequence which encodes a TCR or an immunoglobulin or a region thereof can be identical to the coding sequence known in the art for any given TCR or immunoglobulin gene regions or polypeptide domains (e.g., V-region domains, CDR3 domains, etc.).
  • the coding sequence can be a different coding sequence, which, as a result of the redundancy or degeneracy of the genetic code, encodes the same TCR or immunoglobulin region or polypeptide.
  • primer refers to an oligonucleotide capable of acting as a point of initiation of DNA synthesis under suitable conditions. Such conditions include those in which synthesis of a primer extension product complementary to a nucleic acid strand is induced in the presence of four different nucleoside triphosphates and an agent for extension (e.g., a DNA polymerase or reverse transcriptase) in an appropriate buffer and at a suitable temperature.
  • agent for extension e.g., a DNA polymerase or reverse transcriptase
  • a primer is preferably a single-stranded DNA.
  • the appropriate length of a primer depends on the intended use of the primer but typically ranges from 6 to 50 nucleotides, or in certain embodiments, from 15-35 nucleotides. Short primer molecules generally require cooler temperatures to form sufficiently stable hybrid complexes with the template.
  • a primer need not reflect the exact sequence of the template nucleic acid, but must be sufficiently complementary to hybridize with the template. The design of suitable primers for the amplification of a given target sequence is well known in the art and described in the literature cited herein.
  • primers can incorporate additional features which allow for the detection or immobilization of the primer but do not alter the basic property of the primer, that of acting as a point of initiation of DNA synthesis.
  • primers may contain an additional nucleic acid sequence at the 5′ end which does not hybridize to the target nucleic acid, but which facilitates cloning, detection, or sequencing of the amplified product.
  • the region of the primer which is sufficiently complementary to the template to hybridize is referred to herein as the hybridizing region.
  • a primer is “specific,” for a target sequence if, when used in an amplification reaction under sufficiently stringent conditions, the primer hybridizes primarily to the target nucleic acid.
  • a primer is specific for a target sequence if the primer-target duplex stability is greater than the stability of a duplex formed between the primer and any other sequence found in the sample.
  • salt conditions such as salt conditions as well as base composition of the primer and the location of the mismatches, will affect the specificity of the primer, and that routine experimental confirmation of the primer specificity will be needed in many cases.
  • Hybridization conditions can be chosen under which the primer can form stable duplexes only with a target sequence.
  • the use of target-specific primers under suitably stringent amplification conditions enables the selective amplification of those target sequences which contain the target primer binding sites.
  • ameliorating refers to any therapeutically beneficial result in the treatment of a disease state. e.g., a cancer stage, an autoimmune disease state, including prophylaxis, lessening in the severity or progression, remission, or cure thereof.
  • in vivo refers to processes that occur in a living organism.
  • mammal as used herein includes both humans and non-humans and include but is not limited to humans, non-human primates, canines, felines, murines, bovines, equines, and porcines.
  • percent “identity,” in the context of two or more nucleic acid or polypeptide sequences, refer to two or more sequences or subsequences that have a specified percentage of nucleotides or amino acid residues that are the same, when compared and aligned for maximum correspondence, as measured using one of the sequence comparison algorithms described below (e.g., BLASTP and BLASTN or other algorithms available to persons of skill) or by visual inspection.
  • sequence comparison algorithms e.g., BLASTP and BLASTN or other algorithms available to persons of skill
  • the percent “identity” can exist over a region of the sequence being compared, e.g., over a functional domain, or, alternatively, exist over the full length of the two sequences to be compared.
  • sequence comparison typically one sequence acts as a reference sequence to which test sequences are compared.
  • test and reference sequences are input into a computer, subsequence coordinates are designated, if necessary, and sequence algorithm program parameters are designated.
  • sequence comparison algorithm then calculates the percent sequence identity for the test sequence(s) relative to the reference sequence, based on the designated program parameters.
  • Optimal alignment of sequences for comparison can be conducted, e.g., by the local homology algorithm of Smith & Waterman, Adv. Appl. Math. 2:482 (1981), by the homology alignment algorithm of Needleman & Wunsch, J. Mol. Biol. 48:443 (1970), by the search for similarity method of Pearson & Lipman, Proc. Nat'l. Acad. Sci. USA 85:2444 (1988), by computerized implementations of these algorithms (GAP, BESTFIT, FASTA, and TFASTA in the Wisconsin Genetics Software Package, Genetics Computer Group, 575 Science Dr., Madison, Wis.), or by visual inspection (see generally Ausubel et al., infra).
  • BLAST algorithm One example of an algorithm that is suitable for determining percent sequence identity and sequence similarity is the BLAST algorithm, which is described in Altschul et al., J. Mol. Biol. 215:403-410 (1990). Software for performing BLAST analyses is publicly available through the National Center for Biotechnology Information (www.ncbi.nlm.nih.gov/).
  • a sample, test sample or test biological sample refer to biological tissues (e.g., an aggregate of cells that have similar structure and function) obtained from a subject of interest.
  • the sample can include a complex mixture of adaptive immune cells (e.g., T- and B-lymphocyte lineage cells) and cells that are not adaptive immune cells (e.g., solid tumor cells).
  • a test biological sample of interest comprises somatic tissue.
  • the somatic tissue can comprise a solid tissue.
  • the solid tissue can be a site for autoimmune disease pathology, such as a tissue that is inappropriately targeted by a host's immune system for an “anti-self” immune response.
  • the somatic tissue can comprise a solid tissue that is a site of an infection, such as a bacterial, yeast, viral or other microbial infection (e.g., a Herpes Simplex Virus (HSV) infection).
  • HSV Herpes Simplex Virus
  • the somatic tissue is obtained from a transplanted organ (e.g., a transplanted liver, lung, kidney, heart, spleen, pancreas, skin, intestine and thymus).
  • Samples can be obtained from tissues prior to, during, and/or post treatment. Samples can be used in diagnostic, prognostic, disease monitoring, therapeutic efficacy monitoring and other contexts, thereby providing important information, such as quantification of adaptive immune cell representation in complex tissues comprising a mixture of cells.
  • Adaptive immune cell quantification e.g., quantification of the relative representation of adaptive immune cells in samples
  • adaptive immune cell DNA quantification e.g., quantification of the relative representation of adaptive immune cell DNA in samples that contain DNA from a mixture of cells
  • Adaptive immune cell quantification e.g., quantification of the relative representation of adaptive immune cell DNA in samples that contain DNA from a mixture of cells
  • Adaptive immune cell quantification e.g., quantification of the relative representation of adaptive immune cells in samples
  • adaptive immune cell DNA quantification e.g., quantification of the relative representation of adaptive immune cell DNA in samples that contain DNA from a mixture of cells
  • alterations e.g., statistically significant increases or decreases
  • the sample is obtained from a solid tumor in a subject. Multiple samples can be obtained prior to, during and/or following administration of a therapeutic regimen to the subject. A sample can be obtained, for example, by excision of tissue from a pre- or post-treatment subject.
  • the sample comprising tissue is evaluated or analyzed according to other art-accepted criteria.
  • Indicators of status can be, for example, detectable indicator compounds, nanoparticles, nanostructures or other compositions that comprise a reporter molecule which provides a detectable signal indicating the physiological status of a cell or tissue, such as a vital dye (e.g., Trypan blue), a colorimetric pH indicator, a fluorescent compound that may exhibit distinct fluorescence as a function of any of a number of cellular physiological parameters (e.g., pH, intracellular Ca 2+ or other physiologically relevant ion concentration, mitochondrial membrane potential, plasma membrane potential, etc., see Haugland, The Handbook: A Guide to Fluorescent Probes and Labeling Technologies (10 th Ed.) 2005, Invitrogen Corp., Carlsbad, Calif.), an enzyme substrate, a specific oligonucleotide probe
  • the subject or biological source, from which a test biological sample may be obtained may be a human or non-human animal, or a transgenic or cloned or tissue-engineered (including through the use of stem cells) organism.
  • the subject or biological source may be known to have, or may be suspected of having or being at risk for having, a solid tumor or other malignant condition, or an autoimmune disease, or an inflammatory condition, and in certain preferred embodiments of the invention the subject or biological source may be known to be free of a risk or presence of such disease.
  • Certain preferred embodiments contemplate a subject or biological source that is a human subject such as a patient that has been diagnosed as having or being at risk for developing or acquiring cancer according to art-accepted clinical diagnostic criteria, such as those of the U.S. National Cancer Institute (Bethesda, Md., USA) or as described in DeVita, Hellman, and Rosenberg's Cancer: Principles and Practice of Oncology (2008, Lippincott, Williams and Wilkins, Philadelphia/Ovid, New York); Pizzo and Poplack, Principles and Practice of Pediatric Oncology (Fourth edition, 2001. Lippincott, Williams and Wilkins.
  • non-human subject or biological source including, but not limited to, a non-human primate, such as a macaque, chimpanzee, gorilla, vervet, orangutan, baboon, or other non-human primate, including such non-human subjects that may be known to the art as preclinical models, including preclinical models for solid tumors and/or other cancers.
  • a non-human subject that is a mammal, for example, a mouse, rat, rabbit, pig, sheep, horse, bovine, goat, gerbil, hamster, guinea pig or other mammal.
  • Many such mammals may be subjects that are known to the art as preclinical models for certain diseases or disorders, including solid tumors and/or other cancers (e.g., Talmadge et al., 2007 Am. J. Pathol. 170:793: Kerbel, 2003 Canc. Biol. Therap. 2(4 Suppl 1):S 134; Man et al., 2007 Canc. Met. Rev. 26:737; Cespedes et al., 2006 Clin. Transl. Oncol. 8:318).
  • Talmadge et al. 2007 Am. J. Pathol. 170:793: Kerbel, 2003 Canc. Biol. Therap. 2(4 Suppl 1):S 134; Man et al., 2007 Canc. Met. Rev. 26:737; Cespedes et al., 2006 Clin. Transl. Oncol. 8:318).
  • the subject or biological source can be a non-mammalian vertebrate, for example, another higher vertebrate, or an avian, amphibian or reptilian species, or another subject or biological source.
  • Biological samples can be provided by obtaining a blood sample, biopsy specimen, tissue explant, organ culture, biological fluid or any other tissue or cell preparation from a subject or a biological source.
  • a test biological sample can be obtained from a solid tissue (e.g., a solid tumor), for example by surgical resection, needle biopsy or other means for obtaining a test biological sample that contains a mixture of cells.
  • Solid tissues are well known to the medical arts and can include any cohesive, spatially discrete non-fluid defined anatomic compartment that is substantially the product of multicellular, intercellular, tissue and/or organ architecture, such as a three-dimensionally defined compartment that may comprise or derive its structural integrity from associated connective tissue and may be separated from other body areas by a thin membrane (e.g., meningeal membrane, pericardial membrane, pleural membrane, mucosal membrane, basement membrane, omentum organ-encapsulating membrane, or the like).
  • a thin membrane e.g., meningeal membrane, pericardial membrane, pleural membrane, mucosal membrane, basement membrane, omentum organ-encapsulating membrane, or the like.
  • Non-limiting exemplary solid tissues can include brain, liver, lung, kidney, prostate, ovary, spleen, lymph node (including tonsil), skin, thyroid, pancreas, heart, skeletal muscle, intestine, larynx, esophagus and stomach.
  • Anatomical locations, morphological properties, histological characterization, and invasive and/or non-invasive access to these and other solid tissues are all well known to those familiar with the relevant arts.
  • Solid tumors of any type are contemplated as being suitable for characterization of TIL using the compositions and methods described herein.
  • the solid tumor can be a benign tumor or a malignant tumor, which can further be a primary tumor, an invasive tumor or a metastatic tumor.
  • Certain embodiments contemplate a solid tumor that comprises one of a prostate cancer cell, a breast cancer cell, a colorectal cancer cell, a lung cancer cell, a brain cancer cell, a renal cancer cell, a skin cancer cell (such as squamous cell carcinoma, basal cell carcinoma, or melanoma) and an ovarian cancer cell, but the invention is not intended to be so limited and other solid tumor types and cancer cell types may be used.
  • the tumor may comprise a cancer selected from adenoma, adenocarcinoma, squamous cell carcinoma, basal cell carcinoma, melanoma (e.g., malignant melanoma), small cell carcinoma, large cell undifferentiated carcinoma, chondrosarcoma and fibrosarcoma, or the like.
  • a cancer selected from adenoma, adenocarcinoma, squamous cell carcinoma, basal cell carcinoma, melanoma (e.g., malignant melanoma), small cell carcinoma, large cell undifferentiated carcinoma, chondrosarcoma and fibrosarcoma, or the like.
  • art-accepted clinical diagnostic criteria have been established for these and other cancer types, such as those promulgated by the U.S.
  • B cells and T cells can be obtained from a biological sample, such as from a variety of tissue and biological fluid samples including bone marrow, thymus, lymph glands, lymph nodes, peripheral tissues and blood, but peripheral blood is most easily accessed. Any peripheral tissue can be sampled for the presence of B and T cells and is therefore contemplated for use in the methods described herein.
  • Tissues and biological fluids from which adaptive immune cells can be obtained include, but are not limited to skin, epithelial tissues, colon, spleen, a mucosal secretion, oral mucosa, intestinal mucosa, vaginal mucosa or a vaginal secretion, cervical tissue, ganglia, saliva, cerebrospinal fluid (CSF), bone marrow, cord blood, serum, serosal fluid, plasma, lymph, urine, ascites fluid, pleural fluid, pericardial fluid, peritoneal fluid, abdominal fluid, culture medium, conditioned culture medium or lavage fluid.
  • adaptive immune cells can be isolated from an apheresis sample.
  • Peripheral blood samples may be obtained by phlebotomy from subjects.
  • Peripheral blood mononuclear cells PBMCs
  • PBMCs Peripheral blood mononuclear cells
  • Ficoll-Hypaque® density gradient separation e.g., by Ficoll-Hypaque® density gradient separation.
  • whole PBMCs are used for analysis.
  • samples that comprise predominantly lymphocytes e.g., T and B cells
  • samples that comprise predominantly T cells or predominantly B cells can be prepared for use as provided herein, according to established, art-accepted methodologies.
  • kits for isolating different subpopulations of T and B cells include, but are not limited to, subset selection immunomagnetic bead separation or flow immunocytometric cell sorting using antibodies specific for one or more of any of a variety of known T and B cell surface markers.
  • Illustrative markers include, but are not limited to, one or a combination of CD2. CD3, CD4, CD8, CD14, CD19, CD20, CD25, CD28, CD45RO, CD45RA, CD54, CD62, CD62L, CDw137 (41BB), CD154, GITR, FoxP3, CD54, and CD28.
  • cell surface markers such as CD2, CD3, CD4, CD8, CD14, CD19, CD20, CD45RA, and CD45RO can be used to determine T, B, and monocyte lineages and subpopulations using flow cytometry.
  • forward light-scatter, side-scatter, and/or cell surface markers such as CD25, CD62L, CD54, CD137, and CD154, can be used to determine activation state and functional properties of cells.
  • Illustrative combinations useful in certain of the methods described herein can include CD8 + CD45RO (memory cytotoxic T cells), CD4 + CD45RO + (memory T helper), CD8 + CD45RO ⁇ (CD8 + CD62L + CD45RA + (na ⁇ ve-like cytotoxic T cells); CD4 + CD25 + CD62L hi GITR + FoxP3 + (regulatory T cells).
  • Illustrative antibodies for use in immunomagnetic cell separations or flow immunocytometric cell sorting include fluorescently labeled anti-human antibodies, e.g., CD4 FITC (clone M-T466, Miltenyi Biotec), CD8 PE (clone RPA-T8, BD Biosciences), CD45RO ECD (clone UCHL-1, Beckman Coulter), and CD45RO APC (clone UCHL-1, BD Biosciences). Staining of cells can be done with the appropriate combination of antibodies, followed by washing cells before analysis.
  • fluorescently labeled anti-human antibodies e.g., CD4 FITC (clone M-T466, Miltenyi Biotec), CD8 PE (clone RPA-T8, BD Biosciences), CD45RO ECD (clone UCHL-1, Beckman Coulter), and CD45RO APC (clone UCHL-1, BD Biosciences).
  • Staining of cells can be done with the appropriate
  • Lymphocyte subsets can be isolated by fluorescence activated cell sorting (FACS), e.g., by a BD FACSAriaTM cell-sorting system (BD Biosciences) and by analyzing results with FlowJoTM software (Treestar Inc.), and also by conceptually similar methods involving specific antibodies immobilized to surfaces or beads.
  • FACS fluorescence activated cell sorting
  • BD Biosciences BD Biosciences
  • FlowJoTM software Telestar Inc.
  • total genomic DNA can be extracted from cells using methods known in the art and/or commercially available kits, e.g., by using the QIAamp® DNA blood Mini Kit (QIAGEN®).
  • the approximate mass of a single haploid genome is 3 picograms (pg).
  • a single diploid genome is approximately 6.5 picograms.
  • the absolute number of T cells can be estimated by assuming one total cell of input material per 6.5 picograms of genomic data. In some embodiments, at least 100,000 to 200,000 cells are used for analysis, i.e., about 0.6 to 1.2 ⁇ g DNA from diploid T or B cells.
  • the method for quantifying the relative representation of adaptive immune cell DNA in a complex mixture of cells involves a multiplex PCR method using a set of forward primers that specifically hybridize to the V segments and a set of reverse primers that specifically hybridize to the J segments, where the multiplex PCR reaction allows amplification of all the possible VJ (and VDJ) combinations within a given population of T or B cells.
  • the multiplex PCR method includes using the set of forward V-segment primers and set of reverse J-segment primers to amplify a given population of synthetic template oligonucleotides comprising the VJ and VDJ combinations. Because the multiplex PCR reaction amplifies substantially all possible combinations of V and J segments, it is possible to determine, using multiplex PCR, the relative number of T cell or B cell genomes in a sample comprising a mixed population of cells.
  • total genomic DNA can be extracted from cells using standard methods known in the art and/or commercially available kits, e.g., by using the QIAamp® DNA blood Mini Kit (QIAGEN®).
  • the approximate mass of a single haploid genome is 3 pg.
  • at least 100,000 to 200,000 cells are used for analysis of diversity, i.e., about 0.6 to 1.2 ⁇ g DNA from diploid T or B cells.
  • total nucleic acid can be isolated from cells, including both genomic DNA and mRNA. If diversity is to be measured from mRNA in the nucleic acid extract, the mRNA must be converted to cDNA prior to measurement. This can readily be done by methods of one of ordinary skill, for example, using reverse transcriptase according to known procedures.
  • DNA or mRNA can be extracted from a sample comprising a mixed population of cells.
  • the sample can be a neoplastic tissue sample or somatic tissue.
  • Illustrative samples for use in the present methods include any type of solid tumor, in particular, a solid tumor from colorectal, hepatocellular, gallbladder, pancreatic, esophageal, lung, breast, prostate, head and neck, renal cell carcinoma, ovarian, endometrial, cervical, bladder and urothelial cancers. Any solid tumor in which tumor-infiltrating lymphocytes are to be assessed is contemplated for use in the present methods.
  • Somatic tissues that are the target of an autoimmune reaction include, but are not limited to, joint tissues, skin, intestinal tissue, all layers of the uvea, iris, vitreous tissue, heart, brain, lungs, blood vessels, liver, kidney, nerve tissue, muscle, spinal cord, pancreas, adrenal gland, tendon, mucus membrane, lymph node, thyroid, endometrium, connective tissue, and bone marrow.
  • DNA or RNA can be extracted from a transplanted organ, such as a transplanted liver, lung, kidney, heart, spleen, pancreas, skin, intestine, and thymus.
  • two or more samples can be obtained from a single tissue (e.g., a single neoplastic tissue) and the relative representations of adaptive immune cells in the two or more samples are quantified to consider variations in different sections of a test tissue.
  • the determination of the relative representation of adaptive immune cells in one sample from a test tissue is sufficient due to minimum variations among different sections of the test tissue.
  • compositions (Primers for Multiplex PCR)
  • compositions are provided for use in a multiplex PCR that comprise a plurality of V-segment primers and a plurality of J-segment primers that are capable of promoting amplification of substantially all productively rearranged adaptive immune receptor CDR3-encoding regions in a sample to produce a multiplicity of amplified rearranged DNA molecules from a population of T cells (for TCR) or B cells (for Ig) in the sample.
  • the TCR and Ig genes can generate millions of distinct proteins via somatic mutation. Because of this diversity-generating mechanism, the hypervariable complementarity determining regions of these genes can encode sequences that can interact with millions of ligands, and these regions are linked to a constant region that can transmit a signal to the cell indicating binding of the protein's cognate ligand.
  • the adaptive immune system employs several strategies to generate a repertoire of T- and B-cell antigen receptors with sufficient diversity to recognize the universe of potential pathogens.
  • CDR3 complementarity-determining region
  • compositions and methods relate to substantially all (e.g., greater than 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%) of these known and readily detectable adaptive immune receptor V-, D- and J-region encoding gene segments.
  • compositions of the invention provide a plurality of V-segment primers and a plurality of J-segment primers that are capable of amplifying substantially all combinations of the V and J segments of a rearranged immune receptor locus.
  • substantially all combinations refers to at least 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more of all the combinations of the V- and J-segments of a rearranged immune receptor locus.
  • the plurality of V-segment primers and the plurality of J-segment primers amplify all of the combinations of the V and J segments of a rearranged immune receptor locus.
  • the plurality of V-segment and J-segment primers can each comprise or consist of a nucleic acid sequence that is the same as, complementary to, or substantially complementary to a contiguous sequence of a target V- or J-region encoding segment (i.e., portion of genomic polynucleotide encoding a V-region or J-region polypeptide, or a portion of mRNA).
  • the V-segment and J-segment primers are “fully complementary” to a contiguous sequence of a target V- or J-region encoding segment, respectively. In other embodiments, the V-segment and J-segment primers are “substantially complementary” with respect to contiguous sequence of a target V- or J-region encoding segment. Generally there are no more than 4, 3 or 2 mismatched base pairs upon hybridization, while retaining the ability to hybridize under the conditions most relevant to their ultimate application.
  • the first “forward” pool can include oligonucleotide primers that are each specific to (e.g., having a nucleotide sequence complementary to a unique sequence region of) each V-region encoding segment (“V segment”) in the respective TCR or Ig gene locus.
  • V segment V-region encoding segment
  • primers targeting a highly conserved region are used, to simultaneously capture many V segments, thereby reducing the number of primers required in the multiplex PCR.
  • a V-segment primer can be complementary to (e.g., hybridize to) more than one functional TCR or Ig V-region encoding segment and act as a promiscuous primer.
  • each V-segment primer is specific for a different, functional TCR or Ig V-region encoding segment.
  • the “reverse” pool primers can include oligonucleotide primers that are each specific to (e.g., having a nucleotide sequence complementary to a unique sequence region of) each J-region encoding segment (“J segment”) in the respective TCR or Ig gene locus.
  • the J-primer can anneal to a conserved sequence in the joining (“J”) segment.
  • a J-segment primer can be complementary to (e.g., hybridize to) more than one J-segment.
  • each J-segment primer is specific to a different, functional TCR or Ig J-region encoding segment. By way of illustration and not limitation.
  • V-segment primers can be used as “forward” primers and J-segment primers can be used as “reverse” primers, according to commonly used PCR terminology, but the skilled person will appreciate that in certain other embodiments J-segment primers may be regarded as “forward” primers when used with V-segment “reverse” primers.
  • the V-segment or J-segment primer is at least 15 nucleotides in length. In other embodiments, the V-segment or J-segment primer is at least 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 45, or 50 nucleotides in length and has the same sequence as, or is complementary to, a contiguous sequence of the target V- or J-region encoding segment.
  • the length of the primers may be longer, such as about 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 80, 85, 90, 95, 100 or more nucleotides in length or more, depending on the specific use or need. All intermediate lengths of the presently described primers are contemplated for use herein.
  • the primers can comprise additional sequences (e.g., nucleotides that may not be the same as or complementary to the target V- or J-region encoding polynucleotide segment), such as restriction enzyme recognition sites, universal adaptor sequences for sequencing, bar code sequences, chemical modifications, and the like (see e.g., primer sequences provided in the sequence listing herein).
  • additional sequences e.g., nucleotides that may not be the same as or complementary to the target V- or J-region encoding polynucleotide segment
  • restriction enzyme recognition sites e.g., restriction enzyme recognition sites, universal adaptor sequences for sequencing, bar code sequences, chemical modifications, and the like (see e.g., primer sequences provided in the sequence listing herein).
  • the V-segment or J-segment primers comprise sequences that share a high degree of sequence identity to the oligonucleotide primers for which nucleotide sequences are presented herein, including those set forth in the Sequence Listing.
  • the V-segment or J-segment primers comprise primer variants that may have substantial identity to the adaptive immune receptor V-segment or J-segment primer sequences disclosed herein.
  • such oligonucleotide primer variants may comprise at least 70% sequence identity, preferably at least 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% or higher sequence identity compared to a reference oligonucleotide sequence, such as the oligonucleotide primer sequences disclosed herein, using the methods described herein (e.g., BLAST analysis using standard parameters).
  • BLAST analysis e.g., BLAST analysis using standard parameters
  • oligonucleotide primer variants will contain one or more substitutions, additions, deletions and/or insertions, preferably such that the annealing ability of the variant oligonucleotide is not substantially diminished relative to that of an adaptive immune receptor V-segment or J-segment primer sequence that is specifically set forth herein.
  • the V-segment or J-segment primers are designed to be capable of amplifying a rearranged TCR or IGH sequence that includes the coding region for CDR3.
  • the plurality of V-segment and J-segment primers each comprise additional sequences at the 5′ end, such as universal adaptor sequences, bar code sequences, random oligonucleotide sequences, and the like.
  • the sequences can be non-naturally occurring sequences and/or sequences that do not naturally appear adjacent to contiguous with a target V- or J-region encoding segment.
  • the plurality of V-segment and J-segment primers are designed to produce amplified rearranged DNA molecules that are less than 600 nucleotides in length, thereby excluding amplification products from non-rearranged adaptive immune receptor loci.
  • the amplified rearranged DNA molecules are at least 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, or 600 nucleotides in length.
  • the amplified rearranged DNA molecule is at least 250 nucleotides in length. In another embodiment, the amplified rearranged DNA molecule is approximately 200 nucleotides in length.
  • the amplified rearranged DNA molecule can be referred to as an amplicon, amplified molecule, PCR product, or amplification product, for example.
  • An exemplary multiplex PCR assay uses a plurality of forward V-segment primers and a plurality of reverse J-segment primers to selectively amplify the rearranged VDJ from each cell. While these primers can anneal to both rearranged and germline V and J gene segments, PCR amplification is limited to rearranged gene segments, due to size bias (e.g., 250 bp PCR product using rearranged gene segments as templates vs. >10 Kb PCR product using germline gene segments as templates).
  • primer selection and primer set design can be performed in a manner that preferably detects productive V and J gene segments, and excludes TCR or IG pseudogenes.
  • Pseudogenes may include V segments that contain an in-frame stop codon within the V-segment coding sequence, a frameshift between the start codon and the CDR3 encoding sequence, one or more repeat-element insertions, and deletions of critical regions, such as the first exon or the RSS.
  • IMGT ImmunoGeneTics
  • V segment genes of which 26 are orphons on other chromosomes and 139 are in the IGH locus at chromosome 14.
  • 51 have at least one functional allele
  • 6 are ORFs (open-reading frames) which are missing at least one highly conserved amino-acid residue
  • 81 are pseudogenes.
  • oligonucleotide primers which are designed to include only those V segments that participate in a functional rearrangement to encode a TCR or IG, without having to include amplification primers specific to the pseudogene and/or orphon sequences or the like.
  • V-segment primers and J-segment primers are designed to sit outside regions where untemplated deletions occur. These V-segment primer and J-segment primer positions are relative to the V gene recombination signal sequence (V-RSS) and J gene recombination signal sequence (J-RSS) in the gene segment. In some embodiments, the V-segment primers and J-segment primers are designed to provide adequate sequence information in the amplified product to identify both the V and J genes uniquely.
  • each of the V-segment primers comprises a first sequence and a second sequence, wherein the first sequence is located 3′ to the second sequence on the V-segment primer.
  • the first sequence is complementary to a portion of a first region of at least one V-segment, and the first region of the V-segment is located immediately 5′ to a second region of the V-segment where untemplated deletions occur during TCR or IG gene rearrangement.
  • the second region of the V-segment is adjacent to and 5′ to a V-recombination signal sequence (V-RSS) of the V-segment.
  • V-RSS V-recombination signal sequence
  • the second region where untemplated deletions occur on the V-segment can be at least 10 base pairs (bps) in length.
  • the 3′-end of the V-segment primer can be placed at least 10 bps upstream from the V-RSS.
  • the V-segment primer is placed greater than 40 base pairs of sequence upstream of the V-RSS.
  • each of the J-segment primers has a first sequence and a second sequence, wherein the first sequence is located 3′ to the second sequence on the J-segment primer.
  • the first sequence of the J-segment primer is complementary to a portion of a first region of a J-segment, and the first region of the J-segment is located immediately 3′ to a second region of the J-segment where untemplated deletions occur during TCR or IG gene rearrangement.
  • the second region of the J-segment is adjacent to and 3′ to a J-recombination signal sequence (J-RSS) of said J-segment, and the second region of the J-segment can be at least 10 base pairs in length.
  • the 3′ end of the J-segment primers are placed at least 10 base pairs downstream of the J-RSS.
  • the first region of the J-segment includes a unique four base tag at positions +11 through +14 downstream of the RSS site.
  • the J-segment deletions are 4 bp+/ ⁇ 2.5 bp in length, and the J-segment primers are placed at least 4 bp downstream of the J-RSS. In some embodiments, the J-segment primer is placed greater than 30 base pairs downstream of the J-RSS.
  • V-segment primers and J-segment primers and exemplary primers can be found in U.S. Ser. No. 12/794,507, filed on Jun. 4, 2010, International App. No. PCT/US2010/037477, filed on Jun. 4, 2010, and U.S. Ser. No. 13/217,126, filed on Aug. 24, 2011, and Robins et al., 2009 Blood 114, 4099, which are each incorporated by reference in its entirety.
  • a multiplex PCR system can be used to amplify rearranged adaptive immune cell receptor loci from genomic DNA and from synthetic template oligonucleotides, preferably from a CDR3 region.
  • the CDR3 region is amplified from a TCR ⁇ , TCR ⁇ , TCR ⁇ , or TCR ⁇ CDR3 region, or similarly from an Ig locus, such as a IgH or IgL (lambda or kappa) locus.
  • a multiplex PCR system comprises a plurality of V-segment forward primers and a plurality of J-segment reverse primers.
  • the plurality of V-segment forward primers can comprise at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25, and in certain embodiments, at least 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, or 39, and in other embodiments 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 65, 70, 75, 80, 85, or more forward primers.
  • Each forward primer specifically hybridizes to or is complementary to a sequence corresponding to one or more V region segments.
  • V-segment primers for amplification of the TCRB are provided in SEQ ID NOs: 1-120.
  • Illustrative J-segment primers for TCRB are provided in SEQ ID NOs: 121-146.
  • Illustrative TCRG V-segment primers are provided in SEQ ID NOs: 147-158.
  • Illustrative TCRG J-segment primers are provided in SEQ ID NOs: 159-166.
  • Illustrative TCRA and TCRD V-segment primers are provided in SEQ ID NOs: 167-276.
  • Exemplary TCRA and TCRD J-segment primers are provided in SEQ ID NOs: 277-406.
  • Illustrative IGH V-segment primers are provided in SEQ ID NOs: 407-578.
  • Exemplary IGH J-segment primers are provided in SEQ ID NOs: 579-592.
  • Exemplary IGK and IGL V-segment primers are provided in SEQ ID NOs: 593-740.
  • Exemplary IGK and IGL J-segment primers are provided in SEQ ID NOs: 741-764.
  • Oligonucleotides that are capable of specifically hybridizing or annealing to a target nucleic acid sequence by nucleotide base complementarity may do so under moderate to high stringency conditions.
  • suitable moderate to high stringency conditions for specific PCR amplification of a target nucleic acid sequence would be between 25 and 80 PCR cycles, with each cycle consisting of a denaturation step (e.g., about 10-30 seconds (s) at least about 95° C.), an annealing step (e.g., about 10-30 s at about 60-68° C.), and an extension step (e.g., about 10-60 s at about 60-72° C.), optionally according to certain embodiments with the annealing and extension steps being combined to provide a two-step PCR.
  • a denaturation step e.g., about 10-30 seconds (s) at least about 95° C.
  • an annealing step e.g., about 10-30 s at about 60-68° C.
  • PCR reagents may be added or changed in the PCR reaction to increase specificity of primer annealing and amplification, such as altering the magnesium concentration, optionally adding DMSO, and/or the use of blocked primers, modified nucleotides, peptide-nucleic acids, and the like.
  • nucleic acid hybridization techniques may be used to assess hybridization specificity of the primers described herein.
  • Hybridization techniques are well known in the art of molecular biology.
  • suitable moderately stringent conditions for testing the hybridization of a polynucleotide as provided herein with other polynucleotides include prewashing in a solution of 5 ⁇ SSC, 0.5% SDS, 1.0 mM EDTA (pH 8.0): hybridizing at 50° C.-60° C., 5 ⁇ SSC, overnight; followed by washing twice at 65° C. for 20 minutes with each of 2 ⁇ , 0.5 ⁇ and 0.2 ⁇ SSC containing 0.1% SDS.
  • stringency of hybridization can be readily manipulated, such as by altering the salt content of the hybridization solution and/or the temperature at which the hybridization is performed.
  • suitable highly stringent hybridization conditions include those described above, with the exception that the temperature of hybridization is increased, e.g., to 60° C.-65° C. or 65° C.-70° C.
  • the primers are designed not to cross an intron/exon boundary.
  • the forward primers in certain embodiments anneal to the V segments in a region of relatively strong sequence conservation between V segments so as to maximize the conservation of sequence among these primers. Accordingly, this minimizes the potential for differential annealing properties of each primer, and so that the amplified region between V- and J-segment primers contains sufficient TCR or Ig V sequence information to identify the specific V gene segment used.
  • the J-segment primers hybridize with a conserved element of the J segment, and have similar annealing strength.
  • the J segment primers anneal to the same conserved framework region motif.
  • Oligonucleotides can be prepared by any suitable method, including direct chemical synthesis by a method such as the phosphotriester method of Narang et al., 1979, Meth. Enzymol. 68:90-99: the phosphodiester method of Brown et al., 1979, Meth. Enzymol. 68:109-151: the diethylphosphoramidite method of Beaucage et al., 1981. Tetrahedron Lett. 22:1859-1862; and the solid support method of U.S. Pat. No. 4,458,066, each incorporated herein by reference.
  • a review of synthesis methods of conjugates of oligonucleotides and modified nucleotides is provided in Goodchild, 1990, Bioconjugate Chemistry 1(3): 165-187, incorporated herein by reference.
  • the V-segment primers and J-segment primers of the invention include a second subsequence situated at their 5′ ends that include a universal adaptor sequence complementary to and that can hybridize to sequencing adaptor sequences for use in a DNA sequencer, such as Illumina.
  • the J-region encoding gene segments each have a unique sequence-defined identifier tag of 2, 3, 4, 5, 6, 7, 8, 9, 10 or about 15, 20 or more nucleotides, situated at a defined position relative to a RSS site.
  • a four-base tag may be used, in the J ⁇ -region encoding segment of amplified TCRO CDR3-encoding regions, at positions +11 through +14 downstream from the RSS site.
  • these and related embodiments need not be so limited and also contemplate other relatively short nucleotide sequence-defined identifier tags that may be detected in J-region encoding gene segments and defined based on their positions relative to an RSS site. These may vary between different adaptive immune receptor encoding loci.
  • the recombination signal sequence consists of two conserved sequences (heptamer, 5′-CACAGTG-3′, and nonamer, 5′-ACAAAAACC-3′), separated by a spacer of either 12+/ ⁇ 1 bp (“12-signal”) or 23+/ ⁇ 1 bp (“23-signal”).
  • a number of nucleotide positions have been identified as important for recombination including the CA dinucleotide at position one and two of the heptamer, and a C at heptamer position three has also been shown to be strongly preferred as well as an A nucleotide at positions 5, 6, 7 of the nonamer.
  • the sequencing oligonucleotides may hybridize adjacent to a four base tag within the amplified J-encoding gene segments at positions +11 through +14 downstream of the RSS site.
  • sequencing oligonucleotides for TCRB may be designed to anneal to a consensus nucleotide motif observed just downstream of this “tag”, so that the first four bases of a sequence read will uniquely identify the J-encoding gene segment.
  • Exemplary sequencing oligonucleotide sequences are found below in Table 1 and SEQ ID NOs:765-786.
  • the information used to assign identities to the J- and V-encoding segments of a sequence read is entirely contained within the amplified sequence, and does not rely upon the identity of the PCR primers.
  • the methods described herein allow for the amplification of all possible V-J combinations at a TCR or Ig locus and sequencing of the individual amplified molecules allows for the identification and quantitation of the rearranged DNA encoding the CDR3 regions.
  • the diversity of the adaptive immune cells of a given sample can be inferred from the sequences generated using the methods and algorithms described herein.
  • Methods of the invention further comprise sequencing the amplified adaptive immune receptor encoding DNA molecules that are produced. Sequencing can performed on amplicon products produced from a biological sample comprising adaptive immune cells, and/or of the synthetic template oligonucleotides that are described below.
  • sequencing involves using a set of sequencing oligonucleotides (adaptor sequences) that hybridize to sequencing oligonucleotide sequences within the amplified DNA molecules or the synthetic template oligonucleotides that are described below.
  • Sequencing may be performed using any of a variety of available high through-put single molecule sequencing machines and systems.
  • Illustrative sequence systems include sequence-by-synthesis systems such as the Illumina Genome Analyzer, the Illumina MiSeq, and associated instruments (Illumina, Inc., San Diego, Calif.), Helicos Genetic Analysis System (Helicos BioSciences Corp., Cambridge, Mass.), Pacific Biosciences PacBio RS ( Pacific Biosciences, Menlo Park, Calif.), or other systems having similar capabilities.
  • Sequencing is achieved using a set of sequencing oligonucleotides that hybridize to a defined region within the amplified DNA molecules.
  • the sequencing oligonucleotides are designed such that the V- and J-encoding gene segments can be uniquely identified by the sequences that are generated, based on the present disclosure and in view of known adaptive immune receptor gene sequences that appear in publicly available databases.
  • At least 30, 40, 50, 60, 70, 80, 90, 100, 101-150, 151-200, 201-300, 301-500, and not more than 1000 contiguous nucleotides of the amplified adaptive immune receptor encoding DNA molecules are sequenced.
  • the amplicons and synthetic template oligonucleotides that are sequenced are less than 600 bps in length.
  • the resulting sequencing reads are approximately 130 bps in length.
  • approximately 30 million sequencing reads are produced per sequencing assay.
  • the amplified J-region encoding gene segments may each have a unique sequence-defined identifier tag of 2, 3, 4, 5, 6, 7, 8, 9, 10 or about 15, 20 or more nucleotides, situated at a defined position relative to a RSS site.
  • a four-base tag may be used, in the J ⁇ -region encoding segment of amplified TCR ⁇ CDR3-encoding regions, at positions +11 through +14 downstream from the RSS site.
  • these and related embodiments need not be so limited and also contemplate other relatively short nucleotide sequence-defined identifier tags that may be detected in J-region encoding gene segments and defined based on their positions relative to an RSS site. These may vary between different adaptive immune receptor encoding loci.
  • the recombination signal sequence consists of two conserved sequences (heptamer, 5′-CACAGTG-3′, and nonamer, 5′-ACAAAAACC-3′), separated by a spacer of either 12+/ ⁇ 1 bp (“12-signal”) or 23+/ ⁇ 1 bp (“23-signal”).
  • a number of nucleotide positions have been identified as important for recombination including the CA dinucleotide at position one and two of the heptamer, and a C at heptamer position three has also been shown to be strongly preferred as well as an A nucleotide at positions 5, 6, 7 of the nonamer.
  • sequencing oligonucleotides may hybridize adjacent to a four base tag within the amplified J-encoding gene segments at positions +11 through +14 downstream of the RSS site.
  • sequencing oligonucleotides for TCRB may be designed to anneal to a consensus nucleotide motif observed just downstream of this “tag”, so that the first four bases of a sequence read will uniquely identify the J-encoding gene segment.
  • Exemplary TCRB J primers are found in SEQ ID NOs: 121-146 (showing TCRB J-segment reverse primers (gene specific) and TCRB J-segment reverse primers with an universal adaptor sequence.
  • the information used to assign identities to the J- and V-encoding segments of a sequence read is entirely contained within the amplified sequence, and does not rely upon the identity of the PCR primers.
  • the methods described herein allow for the amplification of all possible V-J combinations at a TCR or Ig locus and sequencing of the individual amplified molecules allows for the identification and quantitation of the rearranged DNA encoding the CDR3 regions.
  • the diversity of the adaptive immune cells of a given sample can be inferred from the sequences generated using the methods and algorithms described herein.
  • One surprising advantage provided in certain preferred embodiments by the compositions and methods of the present disclosure was the ability to amplify successfully all possible V-J combinations of an adaptive immune cell receptor locus in a single multiplex PCR reaction.
  • the sequencing oligonucleotides described herein may be selected such that promiscuous priming of a sequencing reaction for one J-encoding gene segment by an oligonucleotide specific to another distinct J-encoding gene segment generates sequence data starting at exactly the same nucleotide as sequence data from the correct sequencing oligonucleotide. In this way, promiscuous annealing of the sequencing oligonucleotides does not impact the quality of the sequence data generated.
  • the average length of the CDR3-encoding region, for the TCR defined as the nucleotides encoding the TCR polypeptide between the second conserved cysteine of the V segment and the conserved phenylalanine of the J segment, is 35+/ ⁇ 3 nucleotides. Accordingly and in certain embodiments, PCR amplification using V-segment primers and J-segment primers that start from the J segment tag of a particular TCR or IgH J region (e.g., TCR JO, TCR J ⁇ or IgH JH as described herein) will nearly always capture the complete V-D-J junction in a 50 base pair read.
  • the average length of the IgH CDR3 region is less constrained than at the TCR ⁇ locus, but will typically be between about 10 and about 70 nucleotides. Accordingly and in certain embodiments, PCR amplification using V-segment primers and J-segment primers that start from the IgH J segment tag will capture the complete V-D-J junction in a 100 base pair read.
  • the TCR and Ig J-segment reverse PCR primers may be designed to minimize overlap with the sequencing oligonucleotides, in order to minimize promiscuous priming in the context of multiplex PCR.
  • the TCR and Ig J-segment reverse primers may be anchored at the 3′ end by annealing to the consensus splice site motif, with minimal overlap of the sequencing primers.
  • the TCR and Ig V and J-segment primers may be selected to operate in PCR at consistent annealing temperatures using known sequence/primer design and analysis programs under default parameters.
  • exemplary IGH J primers used for sequencing are found in SEQ ID NOs:579-592 (showing IGH J-segment reverse primers (gene specific) and IGH J-segment reverse primers with a universal adaptor sequence.
  • an algorithm is provided to correct for PCR bias, sequencing and PCR errors and for estimating true distribution of specific clonotypes (e.g., a TCR or Ig having a uniquely rearranged CDR3 sequence) in a sample.
  • specific clonotypes e.g., a TCR or Ig having a uniquely rearranged CDR3 sequence
  • a preferred algorithm is described in further detail herein. As would be recognized by the skilled person, the algorithms provided herein may be modified appropriately to accommodate particular experimental or clinical situations.
  • Sequenced reads are filtered for those including CDR3 sequences.
  • Sequencer data processing involves a series of steps to remove errors in the primary sequence of each read, and to compress the data.
  • a complexity filter removes approximately 20% of the sequences that are misreads from the sequencer.
  • sequences were required to have a minimum of a six base match to both one of the TCR or Ig J-regions and one of V-regions.
  • Applying the filter to the control lane containing phage sequence on average only one sequence in 7-8 million passed these steps.
  • a nearest neighbor algorithm is used to collapse the data into unique sequences by merging closely related sequences, in order to remove both PCR error and sequencing error.
  • the ratio of sequences in the PCR product are derived working backward from the sequence data before estimating the true distribution of clonotypes (e.g., unique clonal sequences) in the blood. For each sequence observed a given number of times in the data herein, the probability that that sequence was sampled from a particular size PCR pool is estimated. Because the CDR3 regions sequenced are sampled randomly from a massive pool of PCR products, the number of observations for each sequence are drawn from Poisson distributions. The Poisson parameters are quantized according to the number of T cell genomes that provided the template for PCR. A simple Poisson mixture model both estimates these parameters and places a pairwise probability for each sequence being drawn from each distribution. This is an expectation maximization method which reconstructs the abundances of each sequence that was drawn from the blood.
  • clonotypes e.g., unique clonal sequences
  • a computational approach employing the “unseen species” formula may be employed (Efron and Thisted, 1976 Biometrika 63, 435-447).
  • This approach estimates the number of unique species (e.g., unique adaptive immune receptor sequences) in a large, complex population (e.g., a population of adaptive immune cells such as T cells or B cells), based on the number of unique species observed in a random, finite sample from a population (Fisher et al., 1943 J. Anim. Ecol. 12:42-58; Ionita-Laza et al., 2009 Proc. Nat. Acad. Sci. USA 106:5008).
  • the method employs an expression that predicts the number of “new” species that would be observed if a second random, finite and identically sized sample from the same population were to be analyzed.
  • “Unseen” species refers to the number of new adaptive immune receptor sequences that would be detected if the steps of amplifying adaptive immune receptor-encoding sequences in a sample and determining the frequency of occurrence of each unique sequence in the sample were repeated an infinite number of times.
  • adaptive immune cells e.g., T cells, B cells
  • unique adaptive immune receptors e.g., TCR ⁇ , TCR ⁇ , TCR ⁇ , TCR ⁇ , IgH
  • clonotypes takes the place of species.
  • S the total number of adaptive immune receptors having unique sequences (e.g., TCR ⁇ , TCR ⁇ , IgH “species” or clonotypes, which may in certain embodiments be unique CDR3 sequences)
  • a sequencing experiment observes x s copies of sequence s.
  • each TCR or Ig clonotype is “captured” in the course of obtaining a random sample (e.g., a blood draw) according to a Poisson process with parameter ⁇ s .
  • the number of T or B cell genomes sequenced in the first measurement is defined as 1, and the number of T or B cell genomes sequenced in the second measurement is defined as i.
  • G( ⁇ ) is the empirical distribution function of the parameters ⁇ 1 , . . . , ⁇ S , and n x is the number of clonotypes (e.g., unique TCR or Ig sequences, or unique CDR3 sequences) observed exactly x times
  • n x is the number of clonotypes (e.g., unique TCR or Ig sequences, or unique CDR3 sequences) observed exactly x times
  • formula (I) may be used to estimate the total diversity of species in the entire source from which the identically sized samples are taken.
  • the principle is that the sampled number of clonotypes in a sample of any given size contains sufficient information to estimate the underlying distribution of clonotypes in the whole source.
  • the value for ⁇ (t), the number of new clonotypes observed in a second measurement, may be determined, preferably using the following equation (II):
  • a sample such as a sample that comprises a mixture of cells only some of which are adaptive immune cells, can be determined advantageously without the need for cell sorting or for DNA sequencing.
  • TIL adaptive immune cell presence in a sample
  • oligoclonal e.g., whether all TILs are the progeny of one or a relatively limited number of adaptive immune cells
  • adaptive immune cell presence in the sample is polyclonal (e.g., TILs are the progeny of a relatively large number of adaptive immune cells).
  • these embodiments exploit current understanding in the art (also described above) that once an adaptive immune cell (e.g., a T or B lymphocyte) has rearranged its adaptive immune receptor-encoding (e.g., TCR or Ig) genes, its progeny cells possess the same adaptive immune receptor-encoding gene rearrangement, thus giving rise to a clonal population that can be identified by the presence therein of rearranged CDR3-encoding V- and J-gene segments that may be amplified by a specific pairwise combination of V- and J-specific oligonucleotide primers as herein disclosed.
  • an adaptive immune cell e.g., a T or B lymphocyte
  • its adaptive immune receptor-encoding e.g., TCR or Ig
  • Synthetic Template Oligonucleotide Compositions for Use in Quantifying Input Genomes from Adaptive Immune Cells, and Determining Relative Representation of Adaptive Immune Cells
  • Synthetic template oligonucleotides can be designed to quantify a number of input molecules in a biological sample.
  • synthetic template means an oligonucleotide containing sequences which include sequences substantially identical to biological sequences (i.e. TCR V, J or C segments or genomic control regions) in addition to non-naturally occurring sequences (i.e. barcodes, randomers, adaptors, etc.).
  • sequences substantially identical to biological sequences i.e. TCR V, J or C segments or genomic control regions
  • non-naturally occurring sequences i.e. barcodes, randomers, adaptors, etc.
  • a ratio of the number of input synthetic template oligonucleotide molecules in a sample compared to the number of total output sequencing reads of synthetic template oligonucleotides (sequenced from synthetic template amplicons) in the sample is determined.
  • a limiting dilution of synthetic template oligonucleotides (which allows for the determination of the number of total synthetic template oligonucleotide molecules present by measuring the number of unique synthetic template oligonucleotide sequences observed) is added to a biological sample for multiplex PCR, and by assuming the same ratio holds for biological as synthetic templates, the ratio is used to determine the number of rearranged T or B cell receptor molecules, and thus the number of T or B cells, in the biological sample.
  • the invention comprises a synthetic template composition comprising a plurality of template oligonucleotides of general formula (I) or (II):
  • the constituent template oligonucleotides are diverse with respect to the nucleotide sequences of the individual template oligonucleotides.
  • U1 and U2 are each either nothing or each comprise an oligonucleotide having, independently, a sequence that is selected from (i) a universal adaptor oligonucleotide sequence, and (ii) a sequencing platform-specific oligonucleotide sequence that is linked to and positioned 5′ to the universal adaptor oligonucleotide sequence.
  • I depicted in general formula II is an internal marker oligonucleotide sequence comprising at least 2 nucleotides, and not more than 100 nucleotides.
  • B1, B2, and B3 can each be independently either nothing or each comprise an oligonucleotide “B” that comprises an oligonucleotide barcode sequence of 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700, 800, 900 or 1000 contiguous nucleotides (including all integer values therebetween).
  • B1, B2, and B3 can each comprise a unique oligonucleotide sequence that uniquely identifies, or identifies as a paired combination, (i) the unique V oligonucleotide sequence of the template oligonucleotide and (ii) the unique J oligonucleotide sequence of the template oligonucleotide.
  • the relative positioning of the barcode oligonucleotides B, B2, and B3 and universal adaptors U1 and U2 advantageously permits rapid identification and quantification of the amplification products of a given unique template oligonucleotide by short sequence reads and paired-end sequencing on automated DNA sequencers (e.g., Illumina HiSeqTM or Illumina MiSEQ®, or GeneAnalyzerTM-2, Illumina Corp., San Diego, Calif.).
  • automated DNA sequencers e.g., Illumina HiSeqTM or Illumina MiSEQ®, or GeneAnalyzerTM-2, Illumina Corp., San Diego, Calif.
  • these and related embodiments permit rapid high-throughput determination of specific combinations of a V-segment sequence and a J-segment sequence that are present in an amplification product, thereby to characterize the relative amplification efficiency of each V-specific primer and each J-specific primer that may be present in a primer set, which is capable of amplifying rearranged TCR or BCR encoding DNA in a sample. Verification of the identities and/or quantities of the amplification products may be accomplished by longer sequence reads, optionally including sequence reads that extend to B2.
  • V can be either nothing or a polynucleotide comprising at least 20, 30, 60, 90, 120, 150, 180, or 210, and not more than 1000, 900, 800, 700, 600 or 500 contiguous nucleotides of a DNA sequence.
  • the DNA sequence is of an adaptive immune receptor variable (V) region encoding gene sequence, or the complement thereof, and in each of the plurality of template oligonucleotide sequences V comprises a unique oligonucleotide sequence.
  • V adaptive immune receptor variable
  • J can be either nothing or a polynucleotide comprising at least 15-30, 31-60, 61-90, 91-120, or 120-150, and not more than 600, 500, 400, 300 or 200 contiguous nucleotides of a DNA sequence.
  • the DNA sequence is of an adaptive immune receptor joining (J) region encoding gene sequence, or the complement thereof, and in each of the plurality of template oligonucleotide sequences J comprises a unique oligonucleotide sequence.
  • J adaptive immune receptor joining
  • V and J regions of the synthetic template oligonucleotides of formula I or 11 various adaptive immune receptor variable (V) region and joining (J) region gene sequences can be used.
  • V and J region gene sequences are known as nucleotide and/or amino acid sequences, including non-rearranged genomic DNA sequences of TCR and Ig loci, and productively rearranged DNA sequences at such loci and their encoded products, and also including pseudogenes at these loci, and also including related orphons. See, e.g., U.S. Ser. No. 13/217,126: U.S. Ser. No.
  • V region gene sequences include polynucleotide sequences that encode the products of expressed, rearranged TCR and BCR genes and also include polynucleotide sequences of pseudogenes that have been identified in the V region loci.
  • V polynucleotide sequences that may be incorporated into the presently disclosed templates of general formula I or II may vary widely in length, in nucleotide composition (e.g., GC content), and in actual linear polynucleotide sequence, and are known, for example, to include “hot spots” or hypervariable regions that exhibit particular sequence diversity.
  • sequences known to the art may be used according to the present disclosure for the design and production of template oligonucleotides to be included in the presently provided template composition for standardizing amplification efficiency of an oligonucleotide primer set, and for the design and production of the oligonucleotide primer set that is capable of amplifying rearranged DNA encoding TCR or Ig polypeptide chains, which rearranged DNA may be present in a biological sample comprising lymphoid cell DNA.
  • each polynucleotide V in general formula I or II can, but need not, consist exclusively of contiguous nucleotides from each distinct V gene.
  • each polynucleotide V of formula I or II need only have at least a region comprising a unique V oligonucleotide sequence that is found in one V gene and to which a single V region primer in the primer set can specifically anneal.
  • the V polynucleotide of formula I or II may comprise all or any prescribed portion (e.g., at least 15, 20, 30, 60, 90, 120, 150, 180 or 210 contiguous nucleotides, or any integer value therebetween) of a naturally occurring V gene sequence (including a V pseudogene sequence), so long as at least one unique V oligonucleotide sequence region (e.g., the primer annealing site) is included that is not included in any other template V polynucleotide.
  • a naturally occurring V gene sequence including a V pseudogene sequence
  • the plurality of V polynucleotides that are present in the synthetic template composition have lengths that simulate the overall lengths of known, naturally occurring V gene nucleotide sequences, even where the specific nucleotide sequences differ between the template V region and any naturally occurring V gene.
  • the V region lengths in the synthetic templates can differ from the lengths of naturally occurring V gene sequences by no more than 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 percent.
  • the V polynucleotide of the herein described synthetic template oligonucleotide includes a stop codon at or near the 3′ end of V in general formula I or 11.
  • the V polynucleotide in formula (I) may thus, in certain embodiments, comprise a nucleotide sequence having a length that is the same or similar to that of the length of a typical V gene from its start codon to its CDR3 encoding region and may, but need not, include a nucleotide sequence that encodes the CDR3 region.
  • CDR3 encoding nucleotide sequences and sequence lengths may vary considerably and have been characterized by several different numbering schemes (e.g., Lefranc, 1999 The Immunologist 7:132; Kabat et al., 1991 In: Sequences of Proteins of Immunological Interest , NIH Publication 91-3242: Chothia et al., 1987 J. Mol. Biol.
  • the CDR3 lengths of the presently disclosed synthetic template oligonucleotides should, for any given TCR or BCR locus, fall within the same range as 95% of naturally occurring rearrangements.
  • the CDR3 encoding portion of the V polynucleotide cab has a length of from 24 to 54 nucleotides, including every integer therebetween.
  • the numbering schemes for CDR3 encoding regions described above denote the positions of the conserved cysteine, phenylalanine and typtophan codons, and these numbering schemes may also be applied to pseudogenes in which one or more codons encoding these conserved amino acids may have been replaced with a codon encoding a different amino acid.
  • the CDR3 length may be defined relative to the corresponding position at which the conserved residue would have been observed absent the substitution, according to one of the established CDR3 sequence position numbering schemes referenced above.
  • each polynucleotide J in general formula I or II may, but need not, consist exclusively of contiguous nucleotides from each distinct J gene.
  • each polynucleotide J of formula I or II need only have at least a region comprising a unique J oligonucleotide sequence that is found in one J gene and to which a single V region primer in the primer set can specifically anneal.
  • the V polynucleotide of formula I or II may comprise all or any prescribed portion (e.g., at least 15, 20, 30, 60, 90, 120, 150, 180 or 210 contiguous nucleotides, or any integer value therebetween) of a naturally occurring V gene sequence (including a V pseudogene sequence) so long as at least one unique V oligonucleotide sequence region (the primer annealing site) is included that is not included in any other template J polynucleotide.
  • a naturally occurring V gene sequence including a V pseudogene sequence
  • the plurality of J polynucleotides that are present in the herein described template composition have lengths that simulate the overall lengths of known, naturally occurring J gene nucleotide sequences, even where the specific nucleotide sequences differ between the template J region and any naturally occurring J gene.
  • the J region lengths in the herein described templates may differ from the lengths of naturally occurring J gene sequences by no more than 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 percent.
  • the J polynucleotide in formula I or II may thus, in certain embodiments, comprise a nucleotide sequence having a length that is the same or similar to that of the length of a typical naturally occurring J gene and may, but need not, include a nucleotide sequence that encodes the CDR3 region, as discussed above.
  • J region gene sequences include polynucleotide sequences that encode the products of expressed and unexpressed rearranged TCR and BCR genes.
  • the diverse J polynucleotide sequences that may be incorporated into the presently disclosed templates of general formula I or II may vary widely in length, in nucleotide composition (e.g., GC content), and in actual linear polynucleotide sequence.
  • V and J sequences described herein for use in construction of the herein described template oligonucleotides and/or V-segment and J-segment oligonucleotide primers, may be selected by a skilled person based on the present disclosure using knowledge in the art regarding published gene sequences for the V- and J-encoding regions of the genes for each TCR and Ig subunit.
  • Reference Genbank entries for human adaptive immune receptor sequences include: TCR ⁇ : (TCRA/D): NC_000014.8 (chr14:22090057.23021075); TCR ⁇ : (TCRB): NC_000007.13 (chr7:141998851.142510972); TCR ⁇ : (TCRG): NC_000007.13 (chr7:38279625.38407656); immunoglobulin heavy chain, IgH (IGH): NC_000014.8 (chr14: 106032614.107288051); immunoglobulin light chain-kappa.
  • Reference Genbank entries for mouse adaptive immune receptor loci sequences include: TCR ⁇ : (TCRB): NC_000072.5 (chr6: 40841295.41508370), and immunoglobulin heavy chain, IgH (IGH): NC_000078.5 (chr12:114496979.117248165).
  • Template and primer design analyses and target site selection considerations can be performed, for example, using the OLIGO primer analysis software and/or the BLASTN 2.0.5 algorithm software (Altschul et al., Nucleic Acids Res. 1997, 25(17):3389-402), or other similar programs available in the art.
  • oligonucleotide design methodologies for inclusion in the instant template oligonucleotides those skilled in the art can design a plurality of V region-specific and J region-specific polynucleotide sequences that each independently contain oligonucleotide sequences that are unique to a given V and J gene, respectively.
  • a primer set comprising a plurality of V region-specific and J region-specific oligonucleotide primers that are each independently capable of annealing to a specific sequence that is unique to a given V and J gene, respectively, whereby the plurality of primers is capable of amplifying substantially all V genes and substantially all J genes in a given adaptive immune receptor-encoding locus (e.g., a human TCR or IgH locus).
  • a given adaptive immune receptor-encoding locus e.g., a human TCR or IgH locus
  • Such primer sets permit generation, in multiplexed (e.g., using multiple forward and reverse primer pairs) PCR, of amplification products that have a first end that is encoded by a rearranged V region-encoding gene segment and a second end that is encoded by a J region-encoding gene segment.
  • such amplification products may include a CDR3-encoding sequence although the invention is not intended to be so limited and contemplates amplification products that do not include a CDR3-encoding sequence.
  • the primers may be preferably designed to yield amplification products having sufficient portions of V and J sequences and/or of V-J barcode (B) sequences as described herein, such that by sequencing the products (amplicons), it is possible to identify on the basis of sequences that are unique to each gene segment (i) the particular V gene, and (ii) the particular J gene in the proximity of which the V gene underwent rearrangement to yield a functional adaptive immune receptor-encoding gene.
  • the PCR amplification products will not be more than 600 base pairs in size, which according to non-limiting theory will exclude amplification products from non-rearranged adaptive immune receptor genes. In certain other preferred embodiments the amplification products will not be more than 500, 400, 300, 250, 200, 150, 125, 100, 90, 80, 70, 60, 50, 40, 30 or 20 base pairs in size, such as may advantageously provide rapid, high-throughput quantification of sequence-distinct amplicons by short sequence reads.
  • V is a polynucleotide sequence that encodes at least 10-70 contiguous amino acids of an adaptive immune receptor V-region, or the complement thereof:
  • J is a polynucleotide sequence that encodes at least 5-30 contiguous amino acids of an adaptive immune receptor J-region, or the complement thereof:
  • U1 and U2 are each either nothing or comprise an oligonucleotide comprising a nucleotide sequence that is selected from (i) a universal adaptor oligonucleotide sequence, and (ii) a sequencing platform-specific oligonucleotide sequence that is linked to and positioned 5′ to the universal adaptor oligonucleotide sequence:
  • B1, B2, and B3 are each independently either nothing or each comprise an oligonucleotide B that comprises an oligonucleotide barcode sequence of 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 contiguous nucleotides, wherein in each of the
  • V is a polynucleotide sequence of at least 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400 or 450 and not more than 1000, 900, 800, 700, 600 or 500 contiguous nucleotides of an adaptive immune receptor (e.g., TCR or BCR) variable (V) region gene sequence, or the complement thereof, and in each of the plurality of oligonucleotide sequences V comprises a unique oligonucleotide sequence.
  • an adaptive immune receptor e.g., TCR or BCR
  • V variable
  • FIG. 1A illustrates one example of a synthetic template oligonucleotide, according to an embodiment of the invention.
  • a synthetic template oligonucleotide comprises the following regions (left to right, as shown in FIG. 1 ): a universal primer sequence (UA) (102), a template-specific barcode (BC) (104), a sequence comprising a portion of or all of a unique adaptive immune receptor variable (V) region encoding gene sequence (V gene) (106), a synthetic template internal marker (IM) (108), a repeat of the barcode (BC) (104), a repeat of the internal marker (IM) (108), a sequence comprising a portion of or all of a unique adaptive immune receptor variable (J) region encoding gene sequence (J gene) (110), a third repeat of the barcode (BC) (104), and a reverse universal primer sequence (UB) (112).
  • UUA universal primer sequence
  • BC template-specific barcode
  • V unique adaptive immune receptor variable region encoding gene sequence
  • IM
  • Each synthetic template oligonucleotide includes a unique adaptive immune receptor variable (V) region encoding gene sequence and unique adaptive immune receptor joining (J) region encoding gene sequence.
  • V adaptive immune receptor variable
  • J adaptive immune receptor joining
  • the synthetic template oligonucleotide can be a 495 bp sequence comprising a universal primer sequence (UA) (102), a 16 bp template-specific barcode (BC) (104), a 300 bp adaptive immune receptor variable (V) region encoding gene sequence (V gene) (106), a 9 bp synthetic template internal marker (IM) (108), a repeat of the barcode (BC) (104), a repeat of the internal marker (IM) (108), a 100 bp adaptive immune receptor variable (J) region encoding gene sequence (J gene) (110), a third repeat of the barcode (BC) (104), and a reverse universal primer sequence (UB) (112).
  • Various lengths of the sequences and order of the regions can be used in designing the synthetic template oligonucleotides, as known by one skilled in the art.
  • the synthetic template oligonucleotides of Formula I can also include adaptor sequences.
  • the adaptor sequences can be added to the synthetic template oligonucleotides by designing primers that include adaptor sequences at their 5′-ends and that specifically hybridize to the adaptor UA and UB regions on the synthetic template oligonucleotides (see FIG. 1(A) .
  • An example of an adaptor sequence is an Illumina adaptor sequence, as described in the section “Adaptors” below.
  • the resulting synthetic template oligonucleotide amplicons have the structure of general formula I and can include an adaptor sequence or adaptor sequences (Illumina sequence), such that the sequence of the synthetic template oligonucleotide comprises the following: an adaptor sequence, a universal primer sequence (UA) (102), a template-specific barcode (BC) (104), an adaptive immune receptor variable (V) region encoding gene sequence (V gene) (106), a synthetic template internal marker (IM) (108), a repeat of the barcode (BC) (104), a repeat of the internal marker (IM) (108), an adaptive immune receptor variable (J) region encoding gene sequence (J gene) (110), a third repeat of the barcode (BC) (104), a reverse universal primer sequence (UB) (112), and a second adaptor sequence.
  • UUA universal primer sequence
  • BC template-specific barcode
  • V adaptive immune receptor variable region encoding gene sequence
  • IM synthetic template internal marker
  • J adaptive immune receptor variable region encoding gene sequence
  • the synthetic template composition comprises a plurality of distinct and unique synthetic template oligonucleotides.
  • the plurality of synthetic template oligonucleotides comprises at least a or at least b unique oligonucleotide sequences, whichever is larger, wherein a is the number of unique adaptive immune receptor V region-encoding gene segments in the subject and b is the number of unique adaptive immune receptor J region-encoding gene segments in the subject, and the composition comprises at least one template oligonucleotide for each unique V polynucleotide and at least one template oligonucleotide for each unique J polynucleotide.
  • the plurality of template oligonucleotides comprises at least (a ⁇ b) unique oligonucleotide sequences, where a is the number of unique adaptive immune receptor V region-encoding gene segments in the subject and b is the number of unique adaptive immune receptor J region-encoding gene segments in the subject, and the composition comprises at least one template oligonucleotide for every possible combination of a V region-encoding gene segment and a J region-encoding gene segment.
  • the composition may accommodate at least one occurrence of each unique V polynucleotide sequence and at least one occurrence of each unique J polynucleotide sequence, where in some instances the at least one occurrence of a particular unique V polynucleotide will be present in the same template oligonucleotide in which may be found the at least one occurrence of a particular unique J polynucleotide.
  • “at least one template oligonucleotide for each unique V polynucleotide and at least one template oligonucleotide for each unique J polynucleotide” may in certain instances refer to a single template oligonucleotide in which one unique V polynucleotide and one unique J polynucleotide are present.
  • a is 1 to a number of maximum V gene segments in the mammalian genome of the subject.
  • b is 1 to a number of maximum J gene segments in the mammalian genome of the subject.
  • a is 1.
  • b is 1.
  • a can range from 1 V gene segment to 54 V gene segments for TCRA, 1-76 V gene segments for TCRB, 1-15 V gene segments for TCRG, 1-7 V gene segments for TCRD, 1-165 V gene segments for IGH, 1-111 for IGK, or 1-79 V gene segments for IGL.
  • b can range from 1 J gene segment to 61 J gene segments for TCRA, 1-14 J gene segments for TCRB, 1-5 J gene segments for TCRG, 1-4 gene segments for TCRD, 1-9 J gene segments for IGH, 1-5 J gene segments for IGK, or 1-11 J gene segments for IGL.
  • a pool of synthetic template oligonucleotides comprising every possible combination of a V region-encoding gene segment and a J region-encoding gene segment comprises 248 unique synthetic template types for TCRA-D, 858 unique synthetic types for TCRB, 70 unique synthetic template types for TCRG, 1116 unique synthetic template types for IGH, and 370 unique synthetic template types for IGK/L.
  • V gene segments (a) and J gene segments (b) for each human adaptive immune receptor loci, including functional V and J segments.
  • V gene segments (a) and J gene segments (b) functional V Functional J V segments* segments** J segments* segments** TCRA 54 45 61 50 TCRB 76 48 14 13 TCRG 15 6 5 5 TCRD 7 7 4 4 IGH 165 51 9 6 IGK 111 44 5 5 IGL 79 33 11 7 *Total variable and joining segment genes **Variable and joining segment genes with at least one functional allele
  • the J polynucleotide of the synthetic template oligonucleotide comprises at least 15-30, 31-60, 61-90, 91-120, or 120-150, and not more than 600, 500, 400, 300 or 200 contiguous nucleotides of an adaptive immune receptor J constant region, or the complement thereof.
  • the presently contemplated invention is not intended to be so limited, however, such that in certain embodiments, a substantially fewer number of template oligonucleotides may advantageously be used.
  • the minimum number of unique oligonucleotide sequences of which the plurality of synthetic template oligonucleotides is comprised may be determined by whichever is the larger of a and b, so long as each unique V polynucleotide sequence and each unique J polynucleotide sequence is present in at least one synthetic template oligonucleotide in the template composition.
  • the template composition may comprise at least one synthetic template oligonucleotide for each unique V polynucleotide, e.g., that includes a single one of each unique V polynucleotide according to general formula I or II, and at least one synthetic template oligonucleotide for each unique J polynucleotide, e.g., that includes a single one of each unique J polynucleotide according to general formula I or II.
  • the template composition comprises at least one synthetic template oligonucleotide to which each oligonucleotide amplification primer in an amplification primer set can anneal.
  • the template composition comprises at least one synthetic template oligonucleotide having an oligonucleotide sequence of general formula (I) to which each V-segment oligonucleotide primer can specifically hybridize, and at least one synthetic template oligonucleotide having an oligonucleotide sequence of general formula (I) to which each J-segment oligonucleotide primer can specifically hybridize.
  • the oligonucleotide primer set that is capable of amplifying rearranged DNA encoding one or a plurality of adaptive immune receptors comprises a plurality a′ of unique V-segment oligonucleotide primers and a plurality b′ of unique J-segment oligonucleotide primers.
  • the plurality of a′ V-segment oligonucleotide primers are each independently capable of annealing or specifically hybridizing to at least one polynucleotide encoding an adaptive immune receptor V-region polypeptide or to the complement thereof, wherein each V-segment primer comprises a nucleotide sequence of at least 15 contiguous nucleotides that is complementary to at least one adaptive immune receptor V region-encoding gene segment.
  • the plurality of b′ J-segment oligonucleotide primers are each independently capable of annealing or specifically hybridizing to at least one polynucleotide encoding an adaptive immune receptor J-region polypeptide or to the complement thereof, wherein each J-segment primer comprises a nucleotide sequence of at least 15 contiguous nucleotides that is complementary to at least one adaptive immune receptor J region-encoding gene segment.
  • a′ is the same as a (described above for synthetic template oligonucleotides). In other embodiments, b′ is the same as b (described above for synthetic template oligonucleotides).
  • the present synthetic template composition may be used in amplification reactions with amplification primers that are designed to amplify all rearranged adaptive immune receptor encoding gene sequences, including those that are not expressed.
  • the template composition and amplification primers may be designed so as not to yield amplification products of rearranged genes that are not expressed (e.g., pseudogenes, orphans). It will therefore be appreciated that in certain embodiments only a subset of rearranged adaptive immune receptor encoding genes may desirably be amplified, such that suitable amplification primer subsets may be designed and employed to amplify only those rearranged V-J sequences that are of interest.
  • a synthetic template composition comprising only a subset of interest of rearranged V-J rearranged sequences may be used, so long as the synthetic template composition comprises at least one synthetic template oligonucleotide to which each oligonucleotide amplification primer in an amplification primer set can anneal.
  • the actual number of synthetic template oligonucleotides in the template composition may thus vary considerably among the contemplated embodiments, as a function of the amplification primer set that is to be used.
  • the plurality of synthetic template oligonucleotides comprise SEQ ID NOs:707-3003.
  • the polynucleotide V in general formula I or II includes sequences to which members of oligonucleotide primer sets specific for TCR or BCR genes can specifically anneal.
  • Primer sets that are capable of amplifying rearranged DNA encoding a plurality of TCR or BCR are described, for example, in U.S. Ser. No. 13/217,126: U.S. Ser. No.
  • oligonucleotide sequences that can specifically hybridize to each unique V gene and to each J gene in a particular TCR or BCR gene locus (e.g., TCR ⁇ , ⁇ , ⁇ or ⁇ , or IgH ⁇ , ⁇ , ⁇ , ⁇ or ⁇ , or IgL ⁇ or ⁇ ).
  • an oligonucleotide primer of an oligonucleotide primer amplification set that is capable of amplifying rearranged DNA encoding one or a plurality of TCR or BCR may typically include a nucleotide sequence of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 or 40 contiguous nucleotides, or more, and may specifically anneal to a complementary sequence of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 or 40 contiguous nucleotides of a V or a J polynucleotide as provided herein.
  • the primers may comprise at least 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30 nucleotides, and in certain embodiment the primers may comprise sequences of no more than 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 or 40 contiguous nucleotides. Primers and primer annealing sites of other lengths are also expressly contemplated, as disclosed herein.
  • the polynucleotide J in general formula (I) includes sequences to which members of oligonucleotide primer sets specific for TCR or BCR genes can specifically anneal.
  • Primer sets that are capable of amplifying rearranged DNA encoding a plurality of TCR or BCR are described, for example, in U.S. Ser. No. 13/217,126; U.S. Ser. No.
  • PCT/US2011/026373; or PCT/US2011/049012; or the like; or as described therein may be designed to include oligonucleotide sequences that can specifically hybridize to each unique V gene and to each unique J gene in a particular TCR or BCR gene locus (e.g., TCR ⁇ , ⁇ , ⁇ or ⁇ , or IgH ⁇ , ⁇ , ⁇ , ⁇ or ⁇ , or IgL ⁇ or ⁇ ).
  • V-segment and J-segment oligonucleotide primers can comprise universal adaptor sequences at their 5′-ends for sequencing the resulting amplicons, as described above and in U.S. Ser. No. 13/217,126: U.S. Ser. No. 12/794,507: PCT/US2011/026373; or PCT/US2011/049012.
  • FIG. 1B illustrates primers that hybridize to specific regions of the V-segment and J-segment sequences and also include universal adaptor sequences.
  • oligonucleotide primer sets for amplification may be provided in substantially equimolar amounts.
  • concentration of one or more primers in a primer set may be adjusted deliberately so that certain primers are not present in equimolar amounts or in substantially equimolar amounts.
  • the herein described template oligonucleotides of general formula (I) also may in certain embodiments comprise first (U1) (102) and second (U2) (112) universal adaptor oligonucleotide sequences, or may lack either or both of U1(102) and U2 (112).
  • U1(102) thus may comprise either nothing or an oligonucleotide having a sequence that is selected from (i) a first universal adaptor oligonucleotide sequence, and (ii) a first sequencing platform-specific oligonucleotide sequence that is linked to and positioned 5′ to a first universal adaptor oligonucleotide sequence
  • U2 (112) may comprise either nothing or an oligonucleotide having a sequence that is selected from (i) a second universal adaptor oligonucleotide sequence, and (ii) a second sequencing platform-specific oligonucleotide sequence that is linked to and positioned 5′ to a second universal adaptor oligonucleotide sequence.
  • U1 (102) and/or U2 (112) may, for example, comprise universal adaptor oligonucleotide sequences and/or sequencing platform-specific oligonucleotide sequences that are specific to a single-molecule sequencing technology being employed, for example the HiSeq® or GeneAnalyzerTM-2 (GA-2) systems (Illumina. Inc., San Diego, Calif.) or another suitable sequencing suite of instrumentation, reagents and software.
  • HiSeq® or GeneAnalyzerTM-2 (GA-2) systems Illumina. Inc., San Diego, Calif.
  • Another suitable sequencing suite of instrumentation, reagents and software e.g., a single-molecule sequencing technology
  • Inclusion of such platform-specific adaptor sequences permits direct quantitative sequencing of the presently described template composition, which comprises a plurality of different template oligonucleotides of general formula (I), using a nucleotide sequencing methodology such as the HiSeqTM or GA2 or equivalent. This feature therefore advantageously permits
  • the ability to sequence all components of the template composition directly allows for verification that each template oligonucleotide in the plurality of template oligonucleotides is present in a substantially equimolar amount.
  • a set of the presently described template oligonucleotides may be generated that have universal adaptor sequences at both ends, so that the adaptor sequences can be used to further incorporate sequencing platform-specific oligonucleotides at each end of each template.
  • platform-specific oligonucleotides may be added onto the ends of such modified templates using 5′ (5′-platform sequence-universal adaptor-1 sequence-3′) and 3′ (5′-platform sequence-universal adaptor-2 sequence-3′) oligonucleotides in as little as two cycles of denaturation, annealing and extension, so that the relative representation in the template composition of each of the component template oligonucleotides is not quantitatively altered.
  • Unique identifier sequences e.g., barcode sequences B comprising unique V and B oligonucleotide sequences that are associated with and thus identify, respectively, individual V and J regions, as described herein
  • barcode sequences B comprising unique V and B oligonucleotide sequences that are associated with and thus identify, respectively, individual V and J regions, as described herein
  • Unique identifier sequences are placed adjacent to the adaptor sequences, thus permitting quantitative sequencing in short sequence reads, in order to characterize the template population by the criterion of the relative amount of each unique template sequence that is present.
  • oligonucleotides may be over- or underrepresented in a preparation of the template composition
  • adjustment of the template composition can be made accordingly to obtain a template composition in which all oligonucleotides are present in substantially equimolar amounts.
  • the template composition in which all oligonucleotides are present in substantially equimolar amounts may then be used as a calibration standard for amplification primer sets, such as in the presently disclosed methods for determining and correcting non-uniform amplification potential among members of a primer set.
  • certain embodiments contemplate designing the template oligonucleotide sequences to contain short signature sequences that permit unambiguous identification of the template sequence, and hence of at least one primer responsible for amplifying that template, without having to sequence the entire amplification product.
  • B1, B2, B3, and B4 are each independently either nothing or each comprises an oligonucleotide B that comprises an oligonucleotide barcode sequence of 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600), 700, 800, 900 or 1000 or more contiguous nucleotides (including all integer values therebetween), wherein in each of the plurality of template oligonucleotide sequences B comprises a unique oligonucleotide sequence that uniquely identifies, as a paired combination, (i) the unique V oligonucleotide sequence of the template oligonucleotide and (ii) the unique J oligonucleotide sequence of the template oligonucleotide.
  • synthetic template oligonucleotides having barcode identifier sequences may permit relatively short amplification product sequence reads, such as barcode sequence reads of no more than 1000, 900, 800, 700, 600, 500, 400, 300, 200, 100, 90, 80, 70, 60, 55, 50, 45, 40, 35, 30, 25, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4 or fewer nucleotides, followed by matching this barcode sequence information to the associated V and J sequences that are incorporated into the template having the barcode as part of the template design.
  • barcode sequence reads of no more than 1000, 900, 800, 700, 600, 500, 400, 300, 200, 100, 90, 80, 70, 60, 55, 50, 45, 40, 35, 30, 25, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4 or fewer nucleotides
  • Exemplary barcodes may comprise a first barcode oligonucleotide of 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16 nucleotides that uniquely identifies each V polynucleotide in the template and a second barcode oligonucleotide of 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16 nucleotides that uniquely identifies each J polynucleotide in the template, to provide barcodes of, respectively, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 or 32 nucleotides in length, but these and related embodiments are not intended to be so limited.
  • Barcode oligonucleotides may comprise oligonucleotide sequences of any length, so long as a minimum barcode length is obtained that precludes occurrence of a given barcode sequence in two or more template oligonucleotides having otherwise distinct sequences (e.g., V and J sequences).
  • the minimum barcode length to avoid such redundancy amongst the barcodes that are used to uniquely identify different V-J sequence pairings, is X nucleotides, where 4 x is greater than the number of distinct template species that are to be differentiated on the basis of having non-identical sequences.
  • the minimum barcode length would be five nucleotides, which would permit a theoretical total of 1024 (i.e., greater than 871) different possible pentanucleotide sequences.
  • barcode oligonucleotide sequence read lengths may be limited only by the sequence read-length limits of the nucleotide sequencing instrument to be employed.
  • different barcode oligonucleotides that will distinguish individual species of template oligonucleotides should have at least two nucleotide mismatches (e.g., a minimum hamming distance of 2) when aligned to maximize the number of nucleotides that match at particular positions in the barcode oligonucleotide sequences.
  • B1, B2. B3, and B4 will be identical.
  • oligonucleotide barcode sequences of, for instance, at least 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 200, 300, 300, 500 or more contiguous nucleotides, including all integer values therebetween.
  • design and implementation of oligonucleotide barcode sequence identification strategies see, e.g., de Carcer et al., 2011 Adv. Env. Microbiol. 77:6310; Parameswaran et al., 2007 Nucl. Ac. Res. 35(19):330; Roh et al., 2010 Trends Biotechnol. 28:291.
  • barcodes are placed in templates at locations where they are not found naturally, i.e., barcodes comprise nucleotide sequences that are distinct from any naturally occurring oligonucleotide sequences that may be found in the vicinity of the sequences adjacent to which the barcodes are situated (e.g., V and/or J sequences).
  • barcode sequences may be included, according to certain embodiments described herein, as elements B1, B2 and/or B3 of the presently disclosed template oligonucleotide of general formula (I).
  • certain of the herein described template oligonucleotides of general formula (I) may also in certain embodiments comprise one, two or all three of barcodes B1, B2 and B3, while in certain other embodiments some or all of these barcodes may be absent.
  • all barcode sequences will have identical or similar GC content (e.g., differing in GC content by no more than 20%, or by no more than 19, 18, 17, 16, 15, 14, 13, 12, 11 or 10%).
  • the barcode-containing element B (e.g., B1, B2, B3, and/or B4) comprises the oligonucleotide sequence that uniquely identifies a single paired V-J combination.
  • the barcode-containing element B may also include a random nucleotide, or a random polynucleotide sequence of at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 45, 50, 55, 60, 70, 80, 90, 100, 200, 300, 300, 500 or more contiguous nucleotides, situated upstream and/or downstream of the specific barcode sequence that uniquely identifies each specific paired V-J combination.
  • the random nucleotide or random polynucleotide sequence are independent of one another, that is, they may but need not comprise the same nucleotide or the same polynucleotide sequence.
  • the synthetic template oligonucleotide comprises a randomly generated oligonucleotide sequence, or a “randomer” sequence (110).
  • the randomer sequence is represented as “N” in general formula II.
  • the randomer sequence (110) is generally situated between the V and J sequences, but can be located elsewhere along the synthetic template oligonucleotide. In an embodiment, the randomer sequence (110) only occurs once in the synthetic template.
  • N comprises a random oligonucleotide sequence of 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, or more than 30 contiguous nucleotides.
  • the number of possible nucleotide sequences of length X is 4 X , thus a random nucleotide segment of even a short length may encode many possible unique nucleotide sequences.
  • a randomer sequence (110) of 12 base pairs could encode any one of 16,777,216 unique nucleotide sequences.
  • the randomer sequence (110) ensures that any two synthetic template oligonucleotides have a probability of about 1 in 17 million of containing the same randomer sequence (110).
  • tens or hundreds of thousands of synthetic template oligonucleotides can be included in the PCR reaction with minimal to no overlap in randomer sequences (110) between two distinct synthetic template oligonucleotides.
  • Randomer sequences (110) allow each synthetic template oligonucleotide to be quantitated exactly.
  • each unique random nucleotide sequence observed in the sequencing output represents a single molecule of input material.
  • the input number of synthetic template oligonucleotides added to the amplification reaction can be determined by counting the number of unique random nucleotide sequences.
  • the input number of synthetic template oligonucleotides associated with a particular barcode can be determined by counting the number of unique random nucleotide sequences associated with a particular barcode.
  • Examples of synthetic templates comprising randomers can be found, for example, in SEQ ID NOs: 3004-3159.
  • the template oligonucleotide can also comprise a restriction endonuclease (RE) recognition site that is situated between the V and J sequences and does not occur elsewhere in the template oligonucleotide sequence.
  • the RE recognition site may optionally be adjacent to a barcode site that identifies the V region sequence.
  • the RE site may be included for any of a number of purposes, including without limitation as a structural feature that may be exploited to destroy templates selectively by contacting them with the appropriate restriction enzyme. It may be desirable to degrade the present template oligonucleotides selectively by contacting them with a suitable RE, for example, to remove template oligonucleotides from other compositions into which they may have been deliberately or accidentally introduced.
  • the RE site may be usefully exploited in the course of sequencing template oligonucleotides in the template composition, and/or as a positional sequence marker in a template oligonucleotide sequence regardless of whether or not it is cleaved with a restriction enzyme.
  • An exemplary RE site is the oligonucleotide motif GTCGAC, which is recognized by the restriction enzyme Sal I.
  • additional restriction enzymes and their respective RE recognition site sequences are known in the art and are available commercially (e.g., New England Biolabs, Beverly, Mass.). These include, for example, EcoRI (GAATTC) and SphI (GCATGC).
  • GCATGC EcoRI
  • CATGC SphI
  • Control synthetic template oligonucleotides can be designed to quantify a number of input molecules in a biological sample. These control synthetic template oligonucleotides are similar to the synthetic template oligonucleotides described above, but do not contain a V oligonucleotide sequence or a J oligonucleotide sequence. When referring to synthetic templates, often the V and J region-containing oligonucleotides are referred to as a “first” set of synthetic templates while control synthetic templates are often referred to as a “second” set of synthetic templates. Instead, a control synthetic template composition comprises a plurality of template oligonucleotides of general formula (II):
  • X1 and X2 are either nothing or each comprises a polynucleotide comprising at least 10, 20, 30, or 40, and not more than 1000, 900, or 800 contiguous nucleotides of a DNA sequence.
  • the DNA sequence is of a genomic control gene (also referred to as an “internal control gene”), or the complement thereof.
  • genomic control gene or “internal control gene” is any gene that is found in all cells (including both adaptive immune cells and cells that are not adaptive immune cells), such as a housekeeping gene like RNase P, PSMB2, RAB7A, UBC, VCP, REEP5, or EMC7.
  • Synthetic template oligonucleotides of formula (I) are used to determine a total number of input adaptive immune receptor molecules (and thus adaptive immune cells) in a biological sample.
  • control synthetic template oligonucleotides of formula (II) can be used to determine the total number of all input genomes in a biological sample, the biological sample including adaptive immune cells and cells that are not adaptive immune cells.
  • a control synthetic template composition comprises one of the sequences found in SEQ ID NOs: 3160-3252.
  • SEQ ID NOs: 3167-3194 demonstrate exemplary sequencing primers for control synthetic template compositions containing various control gene segments
  • SEQ ID NOs: 3195-3222 demonstrate exemplary primer sequences for adaptor sequences of the control synthetic template compositions
  • SEQ ID NOs:3223-3236 demonstrate exemplary primer sequences specific for the control synthetic template compositions.
  • FIG. 1 illustrates one example of a control synthetic template oligonucleotide, according to an embodiment of the invention.
  • the control synthetic template oligonucleotide of FIG. 1 has the formula: 5′-X1-N-B1-X2-3′, which differs slightly from the general formula (II) above.
  • control synthetic control templates it is advantageous for the control synthetic control templates to be of similar length to synthetic templates containing TCR and/or Ig V and J or C segments. Furthermore, it is also advantageous in many embodiments for the synthetic templates (both control templates and those containing biological TCR or Ig sequences) to be of similar length to the amplification product of the TCR/Ig loci and the genomic control region from the input sample.
  • the length of the synthetic templates and corresponding amplicons from biological material are between about 100 and about 300 nucleotides (for example, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, or 300 nucleotides).
  • methods of the invention include determining a number of synthetic template oligonucleotides added to a starting sample for use in PCR.
  • the number of input synthetic template oligonucleotides can be estimated by using a limiting dilution of synthetic template oligonucleotides in a multiplex PCR assay. This number of input synthetic template oligonucleotides into a PCR assay and the number of output sequencing reads produced from the PCR assay can then be used to calculate an amplification ratio.
  • a limiting dilution is achieved when the amount of DNA in a sample is diluted to the point where only a very small subset of synthetic template oligonucleotides is present in the dilution.
  • the limiting dilution can include only 100 of the 1000 unique synthetic template oligonucleotides. Most of the unique synthetic templates would be absent in the limiting dilution.
  • the limiting dilution can include only 100 unique types of synthetic template oligonucleotide and only 1 copy of each unique synthetic template oligonucleotide.
  • the limiting dilution of the unique synthetic template oligonucleotides includes one molecule of each detectable, unique synthetic template oligonucleotide.
  • the limiting dilution can include two molecules of one or more of the detectable, unique synthetic template oligonucleotides.
  • the limiting dilution includes a very low concentration of unique synthetic template oligonucleotides.
  • the limiting dilution of synthetic template oligonucleotides is amplified as part of a multiplex PCR, and the number of unique types of synthetic template oligonucleotide amplicons (having a unique barcode sequence, for example) is calculated.
  • Simplex PCR allows for amplification of each unique synthetic template oligonucleotide using one pair of PCR primers for all synthetic templates in the complete pool of synthetic template oligonucleotides.
  • Simplex PCR can be performed on the synthetic template oligonucleotides by using universal primers that include the adaptor sequences and hybridize to the universal primer sequences (UA (102) and UB (112), as shown in FIG. 1B ). Then, the resulting library of synthetic template oligonucleotide amplicons can be individually sequenced using the adaptor sequences on each amplicon on a sequencer, such as an Illumina sequencer. This process allows the direct measurement of the frequency of each synthetic template oligonucleotide in the complex pool.
  • an in silico simulation is used to analyze the relationship between the number of unique synthetic template oligonucleotide amplicons sequenced from the limiting dilution used in a multiplex PCR reaction and the estimated total input number of synthetic template oligonucleotides added to said multiplex PCR reaction.
  • FIG. 2 provides an in silico simulation of the relationship between the number of unique types of synthetic template oligonucleotides observed (e.g., sequenced from the sample) and the number of synthetic template molecules sampled (e.g., number of synthetic template oligonucleotides in the starting sample).
  • the starting sample included approximately 500 synthetic template oligonucleotide molecules. Accordingly, the total number of input synthetic template oligonucleotide can be determined from the number of unique synthetic template oligonucleotides observed.
  • a portion of this pool of synthetic template oligonucleotides can then be added into a multiplex PCR reaction comprising biological rearranged TCR or IG nucleic acid molecules obtained from lymphocytes in a given sample.
  • the determined number of added (“spiked in”) synthetic template oligonucleotides and the calculated amplification ratio can be used to determine a total number of lymphocytes in the sample.
  • a limiting dilution of this pool can be added to a biological sample to determine the number of B or T cells present in said biological sample.
  • An amplification factor is determined based on the number of synthetic template oligonucleotides in a starting sample of synthetic template oligonucleotides that has been added to a biological sample. The amplification factor is calculated by comparing the number of total sequencing reads for synthetic template oligonucleotides obtained from a sample with the total number of input synthetic template oligonucleotides in the sample, and can be used to determine the number of total lymphocytes (T cells or B cells) in a biological sample.
  • This amplification factor can be assumed to apply to biological templates (e.g., rearranged TCR or IG nucleic acid molecules) that have been amplified with the same V-segment and J-segment-specific primers used to amplify synthetic template oligonucleotide molecules.
  • biological templates e.g., rearranged TCR or IG nucleic acid molecules
  • V-segment and J-segment-specific primers used to amplify synthetic template oligonucleotide molecules.
  • the amplification factor (ratio) of the number of sequencing reads of synthetic template oligonucleotide amplicons to the number of total input synthetic template oligonucleotide molecules is compared to the number of total sequencing reads of biological molecule amplicons in order to calculate the starting number of input biological molecules.
  • the number of synthetic template oligonucleotide molecules at the start of the PCR assay can then be used in calculations of the relative representation of adaptive immune cells in the sample, as described in detail below.
  • Methods are provided for determining the absolute representation of rearranged adaptive immune receptor encoding sequences in a sample
  • Methods of the invention include extracting biological nucleic acid molecules (e.g., rearranged TCR or IG DNA molecules) from a biological sample comprising adaptive immune cells and cells that are not adaptive immune cells.
  • the biological nucleic acid molecules in the sample are “spiked” with a known amount of synthetic template oligonucleotides (e.g., as described above and determined by limiting dilution).
  • the synthetic template oligonucleotides comprise the same V-segment and J-segment oligonucleotide sequences as the biological nucleic acid molecule templates.
  • the method for quantifying the absolute number of rearranged DNA molecules encoding a plurality of adaptive immune receptors in a biological sample of a subject comprises the following steps:
  • the amplified synthetic template oligonucleotides are sequenced, and the number of unique synthetic template oligonucleotides based on unique barcode sequences is determined. The number of total sequencing reads from the synthetic template oligonucleotides is also determined from the sequencing output.
  • the results of an in silico simulation based on previous characterization of the synthetic template oligonucleotide pool is referenced to determine from the number of unique synthetic template oligonucleotide sequences the total input number of synthetic template oligonucleotide molecules (e.g., based on the relationship shown in FIG. 2 ).
  • An amplification factor is determined from the ratio of the total output of sequencing reads from the sample and the estimated total number of input synthetic template oligonucleotides. This amplification factor can be used to estimate the total number of biological rearranged molecules, and thus, the total number of lymphoid cells, are in a given sample. This can be done by adding (“spiking in”) a small portion of the pool of dilute synthetic template oligonucleotides to the multiplex PCR.
  • the sequencing information includes the number of output sequencing products from the plurality of rearranged TCR or Ig adaptive immune receptor amplicons (A i ) and the number of output sequencing products from the synthetic template amplicons (A ii ).
  • an amplification factor is first calculated.
  • the amplification factor is the ratio of the number of output sequencing products from the synthetic template amplicons (A ii ) with the known number of input synthetic template oligonucleotides (referred to herein as A iii ).
  • the number of input synthetic template oligonucleotides is determined based on the in silico simulation performed in (I) to determine the relationship between the number of unique synthetic template oligonucleotide amplicons and the total input number of synthetic template oligonucleotides. It is assumed that the amplification factor of a particular primer set for a synthetic template oligonucleotide is the same amplification factor for the biological template.
  • the total number of rearranged TCR or Ig adaptive immune receptor molecules in the sample can be determined.
  • the number of biological rearranged nucleic acid molecules encoding adaptive immune receptors is determined by the following:
  • the total number of rearranged nucleic acid molecules encoding adaptive immune receptors is equal to the total number of adaptive immune cells (e.g., T cells or B cells) in the sample. Accordingly, the total number of adaptive immune cells in the sample can be determined.
  • adaptive immune cells e.g., T cells or B cells
  • Methods of the invention include determining a relative representation of adaptive immune cells in a complex mixture of cells that include adaptive immune cells and cells that are not adaptive immune cells.
  • the total number of adaptive immune cells is determined as described in the section above and then used to calculate the relative representation of adaptive immune cells in the total sample of cells.
  • the total number of rearranged nucleic acid molecules encoding adaptive immune receptors is used to determine the relative representation of adaptive immune cells in the complex mixture.
  • the total mass of DNA in the sample is used to quantify the total number of adaptive immune cells and non-adaptive immune cells in the complex mixture. Assuming that each cell has approximately 6.5 picograms of DNA and given a known total mass of input DNA to the PCR assay, the total number of total adaptive immune cells and non-adaptive immune cells in the sample is quantified by dividing the total known mass of input DNA by 6.5 picograms. This results in the relative representation of adaptive immune cells in the complex mixture of cells that include adaptive immune cells and cells that are not adaptive immune cells.
  • the relative representation of adaptive immune cells total number of rearranged nucleic acid molecules encoding adaptive immune receptors/(total mass of DNA representing adaptive immune cells and non-adaptive immune cells).
  • methods for determining a course of treatment for a patient in need thereof, comprising quantifying the relative representation of tumor-infiltrating lymphocytes or lymphocytes infiltrating a somatic tissue that is the target of an autoimmune reaction, using the methods described herein.
  • the patient in need thereof may be a cancer patient or a patient having an autoimmune disease.
  • a patient may have a cancer including, but not limited to, colorectal, hepatocellular, gallbladder, pancreatic, esophageal, lung, breast, prostate, skin (e.g., melanoma), head and neck, renal cell carcinoma, ovarian, endometrial, cervical, bladder and urothelial cancer.
  • a patient may have an organ transplant, such as a liver transplant, a lung transplant, a kidney transplant, a heart transplant, a spleen transplant, a pancreas transplant, a skin transplant/graft, an intestine transplant, and a thymus transplant.
  • organ transplant such as a liver transplant, a lung transplant, a kidney transplant, a heart transplant, a spleen transplant, a pancreas transplant, a skin transplant/graft, an intestine transplant, and a thymus transplant.
  • Autoimmune diseases include, but are not limited to, arthritis (including rheumatoid arthritis, reactive arthritis), systemic lupus erythematosus (SLE), psoriasis, inflammatory bowel disease (IBD) (including ulcerative colitis and Crohn's disease), encephalomyelitis, uveitis, myasthenia gravis, multiple sclerosis, insulin dependent diabetes, Addison's disease, celiac disease, chronic fatigue syndrome, autoimmune hepatitis, autoimmune alopecia, ankylosing spondylitis, fibromyalgia, pemphigus vulgaris, Sjogren's syndrome, Kawasaki's Disease, hyperthyroidism/Graves disease, hypothyroidism/Hashimoto's disease, endometriosis, scleroderma, pernicious anemia, Goodpasture syndrome, Guillain-Barré syndrome, Wegener's disease, glomerulonephritis, a
  • Evan's syndrome Factor VIII inhibitor syndrome
  • systemic vasculitis dermatomyositis, polymyositis and rheumatic fever
  • autoimmune lymphoproliferative syndrome APS
  • autoimmune bullous pemphigoid Parkinson's disease
  • sarcoidosis vitiligo
  • primary biliary cirrhosis autoimmune myocarditis.
  • the methods described herein may be used to enumerate the relative presence of tumor-infiltrating lymphocytes, or of lymphocytes infiltrating a somatic tissue that is the target of an autoimmune reaction, based on quantification of the relative representation of DNA from such adaptive immune cells in DNA extracted from a biological sample, comprising a mixture of cell types, that has been obtained from such a tumor or tissue.
  • Such methods are useful for determining cancer or autoimmune disease prognosis and diagnosis, for assessing effects of a therapeutic treatment (e.g., assessing drug efficacy and/or dose-response relationships), and for identifying therapeutic courses for cancer treatment, for treatment of autoimmune diseases, or for treatment of transplant rejection, and may find other related uses.
  • certain embodiments contemplate a method in which is assessed an effect of the therapeutic treatment on the relative representation of adaptive immune cells in at least one tissue in a subject to whom the treatment has been administered.
  • a treatment that alters (e.g., increases or decreases in a statistically significant manner) the relative representation of adaptive immune cells in a tissue or tissues may confer certain benefits on the subject.
  • certain cancer immunotherapies are designed to enhance the number of tumor infiltrating lymphocytes (TIL). It has been shown that the presence of CD3+ TIL in ovarian tumors is strongly correlated with patient outcome (see, e.g., Hwang et al., 2011 Gynecol.
  • TIL may be an independent prognostic factor (see, Clarke et al., 2009 Mod. Pathol. 22:393-402).
  • quantification of the relative representation of adaptive immune cell DNA as described herein, for purposes of detecting possible increases in TIL in tumor tissue samples obtained at one or a plurality of time points before treatment, during the course of treatment and/or following treatment may provide highly useful information with respect to determining efficacy of the treatment, and therefrom developing a prognosis for the subject.
  • certain autoimmune disease-directed immunotherapies are designed to reduce the number of tissue infiltrating lymphocytes in one or more afflicted tissues such as tissues or organs that may be targets of clinically inappropriate autoimmune attack, such that quantification of the relative representation of adaptive immune cell DNA as described herein, for purposes of detecting possible decreases in adaptive immune cells in tissue samples obtained at one or a plurality of time points before treatment, during the course of treatment and/or following treatment may provide highly useful information with respect to determining efficacy of the treatment, and therefrom developing a prognosis for the subject.
  • transplant rejection-directed immunotherapies are designed to reduce the number of tissue infiltrating lymphocytes in transplanted organs, such that quantification of the relative representation of adaptive immune cell DNA as described herein, for purposes of detecting possible decreases in adaptive immune cells in tissue samples from transplanted organs obtained at one or a plurality of time points before treatment, during the course of treatment and/or following treatment may provide highly useful information with respect to determining efficacy of the treatment, and therefrom developing a prognosis for the subject.
  • the herein described methods for quantifying the relative representation of adaptive immune cell DNA may be practiced using test biological samples obtained from a subject at one or a plurality of time points prior to administering the therapeutic treatment to the subject, and at one or a plurality of time points after administering the therapeutic treatment to the subject.
  • the samples may be obtained from the same or from different tissues, which may vary as a function of the particular condition of the subject.
  • test biological samples that are obtained from the subject before and after treatment may be from the same tissue, whereas in the case of a tumor that is partially removed surgically, or that occurs at multiple sites in the subject, the test biological samples may be obtained from different tissues or from different tissue sites before and after the therapeutic treatment is administered.
  • any of the herein described methods may further comprise determination of the relative structural diversity of adaptive immune receptors (e.g., the sequence diversity among products of productively rearranged TCR and/or immunoglobulin genes) in the adaptive immune cell component of the mixture of cells that is present in the test biological sample.
  • the present qPCR methodologies using the herein described rearranged adaptive immune receptor encoding specific oligonucleotide primer sets permit ready identification of the particular primer combinations that generate the production of amplified rearranged DNA molecules. Accordingly, for example, these embodiments permit determination of the relative degree of clonality of an adaptive immune cell population that is present as part of a mixed cell population in a test biological sample, which may have prognostic value.
  • the present methods contemplate determination of whether only one or a few (e.g., no more than 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) combinations of a particular V-segment oligonucleotide primer and a particular J-segment oligonucleotide primer are predominantly (e.g., generating at least 80, 85, 90, 95, 97 or 99 percent of amplification products) responsible for the PCR production of amplified rearranged adaptive immune cell DNA molecules.
  • a few e.g., no more than 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10
  • combinations of a particular V-segment oligonucleotide primer and a particular J-segment oligonucleotide primer are predominantly (e.g., generating at least 80, 85, 90, 95, 97 or 99 percent of amplification products) responsible for the PCR production of amplified rearranged adaptive immune cell DNA molecules.
  • Described herein are methods for measuring the number of adaptive immune cells (e.g. T cells) in a complex mixture of cells.
  • the present methods have particular utility in quantifying tumor-infiltrating lymphocytes or lymphocytes infiltrating somatic tissue that is the target of an autoimmune response.
  • Existing methods for T and B cell quantification rely upon the physical separation of such cells from the mixture.
  • T and B cells cannot be separated from the initial sample, such as formalin-fixed or frozen tissue samples.
  • prior methods for adaptive immune cell quantification e.g., flow immunocytofluorimetry, fluorescence activated cell sorting (FACS), immunohistochemistry (IHC)
  • the presently disclosed methods are, by contrast, platform-independent and can be performed on any PCR instrument and high-throughput sequencing instrument, and the reagents can be synthesized and provided in kit form. The presently disclosed methods are also highly sensitive and can be applied in high throughput settings not previously attainable.
  • quantification of adaptive immune cells may be achieved by a simple preparation of DNA from a complex mixture of cells, in concert with quantification of the relative proportion of adaptive immune cells present by amplification of the rearranged adaptive immune cell CDR3-encoding genes.
  • the invention includes methods for comparing adaptive immune cell DNA quantities with total cell DNA (e.g., from adaptive immune cells plus non-adaptive immune cells in the cell mixture). Methods also include optionally comparing other relevant parameters before, during or after administration to a control subject of control compositions that can be, for example, negative controls that have been previously demonstrated to have undergone no statistically significant alteration of physiological state, such as sham injection, saline, DMSO or other vehicle or buffer control, inactive enantiomers, scrambled peptides or nucleotides, etc., and/or before, during or after administration of positive controls that have been previously demonstrated to cause a statistically significant alteration of physiological state, such as an FDA-approved therapeutic compound.
  • the singular forms “a,” “an” and “the” include plural references unless the content clearly dictates otherwise.
  • the terms “about” or “approximately” when preceding a numerical value indicates the value plus or minus a range of 5%, 6%, 7%, 8% or 9%. In other embodiments, the terms “about” or “approximately” when preceding a numerical value indicates the value plus or minus a range of 10%, 11%, 12%, 13% or 14%. In yet other embodiments, the terms “about” or “approximately” when preceding a numerical value indicates the value plus or minus a range of 15%, 16%, 17%, 18%, 19% or 20%.
  • the synthetic template molecules can include a universal forward adaptor sequence, at least one unique barcode sequence, a sequence complementary to a V gene segment, a template internal marker sequence, a random oligonucleotide sequence of length N, and a universal reverse adaptor sequence.
  • the synthetic template molecules with the random oligonucleotide sequence are named “vBlocks.”
  • the synthetic template molecules do not include the random oligonucleotide sequence of length N (called “gBlocks”).
  • the template internal marker sequence is used to distinguish synthetic template molecules from biological molecules.
  • the synthetic template molecule can range in length from 100-a few thousand base pairs in length. In certain embodiments, the synthetic template molecule is 100-2500 bps in length. In one example, the synthetic template molecule can be synthesized as 495 base pair oligonucleotides with the following structure (5′ to 3′): (1) a universal adaptor sequence (UA), (2) a 16 base pair barcode identifying V and J segments, (3) a V gene (about 300 base pairs), (4) a 9 base pair synthetic template internal marker (IM), (5) a repeat of the 16 base pair barcode, (6) a string of 12 random oligonucleotides (N12), (7) a J gene (about 100 base pairs), (8) a repeat of the 16 base pair barcode, and (9) a universal adaptor sequence (UB).
  • U universal adaptor sequence
  • IM 9 base pair synthetic template internal marker
  • the barcode sequences can vary in length from 2-100 base pairs.
  • the random nucleotide sequence (N) can vary in length from 2-100 base pairs, for example.
  • the random oligonucleotide sequence is 8 bps in length (N8). Examples of synthetic template molecules can be found in SEQ ID NOs:3004-3159.
  • FIG. 1 illustrates an exemplary synthetic template molecule, according to one embodiment of the invention.
  • Examples of synthetic template molecules can be found in SEQ ID NOs:3004-3159.
  • universal adaptors are used to characterize molecules without using multiplex PCR
  • Universal adaptors can be present in all synthetic templates. When primers are tailed with the universal and Illumina adaptors and sequenced with Illumina adaptors (see FIG. 1A , above), these templates behave in the same fashion as typical synthetic templates. When amplified using VF and JR multiplex PCR primers and sequenced with JR primers (see FIG. 1A , above), these templates behave in the same fashion as typical synthetic templates. When amplified using VF and JR multiplex PCR primers and sequenced with JR primers (see FIG.
  • these molecules produce a sequencing read with the following structure, for example, (5′ to 3′): (1) J gene sequence (about 15 base pairs), (2) a string of 12 random nucleotides (N12), (3) a 16 base pair V-J barcode (BC), (4) a 9 base pair synthetic template internal marker (IM), and (5) a V gene (about 15 base pairs).
  • the random oligonucleotide sequence is 8 bps in length (N8).
  • N bases of random sequence The chief purpose of including N bases of random sequence is to ensure that each molecule that is used as input to the multiplex PCR has an essentially unique string of random nucleotides (that is, the vast majority of molecules used in the PCR will bear a random oligonucleotide sequence that is distinct from any other molecule used in the PCR).
  • a random oligonucleotide sequence that is 12 base pairs in length ensures that any two molecules have a probability of about 1 in 17 million of containing the same N12 region. This means that tens or hundreds of thousands of these synthetic molecules can be included in the PCR reaction with minimal collisions between N12 regions.
  • the random oligonucleotide sequence is 8 bps in length.
  • 150 different types of synthetic templates are produced, covering different combinations of V and J genes. Each specific V and J combination is indicated by a specific barcode sequence. To determine the precise number of molecules of each combination type in a sample, the randomer sequences can be used. If 100 sequencing reads are determined for a given 16-basepair barcode (for example, for the V3-2 and J 1-7 combination), it is not immediately ascertainable how many molecules with that particular barcode were initially used as a PCR input. However, if all of the randomers associated with that barcode are counted, and there are 5 unique randomers, it can be determined that the 100 sequencing reads correspond to 5 PCR input molecules. This ratio of 20:1 is comparable to other V/J gene combinations to determine what primer bias was present in the PCR reaction, and can be used to count biological PCR inputs, by assuming one molecule of biological input material per twenty biological sequencing reads.
  • the randomized DNA region may be situated anywhere in the intended amplicon (that is, anywhere included in a region expected to be amplified in a PCR reaction).
  • the synthetic template internal marker may be situated anywhere in the intended amplicon, or absent from the amplicon.
  • DNA sequences specific for rearranged adaptive immune receptor gene sequences can be replaced with other DNA sequence-specific primers, allowing this method to be useful for correcting amplification bias and calculating absolute template quantitation in any setting in which multiplex PCR and DNA sequencing are to be performed.
  • the randomized segment of DNA can contain any sufficiently large string of N random nucleotides.
  • compositions and methods overcome inaccuracies that may arise in current methods that quantify TCR and BCR gene diversity by sequencing the products of multiplexed nucleic acid amplification.
  • oligonucleotide primer sets used in multiplexed amplification reactions typically comprise a wide variety of sequence lengths and nucleotide compositions (e.g., GC content).
  • the present disclosure provides a template composition and method for standardizing the amplification efficiencies of the members of an oligonucleotide primer set, where the primer set is capable of amplifying rearranged DNA encoding a plurality of adaptive immune receptors (TCR or Ig) in a biological sample that comprises DNA from lymphoid cells.
  • the primer set is able to amplify the synthetic template molecule and the biological template with the same amplification efficiency.
  • the amplification efficiency of a primer set on a synthetic template is the same for the corresponding biological template with the same V and J sequences as the synthetic template.
  • Synthetic templates are used as in-line controls to measure the amplification efficiencies of primer pairs in a multiplex PCR assay.
  • the resulting amplicons of synthetic template molecules and biological templates are sequenced using known high-throughput sequencing techniques, such as Illumina®. Methods and compositions for minimizing amplification bias are described in International Application No. PCT/US2013/040221, filed on May 8, 2013, which is incorporated by reference in its entirety.
  • Methods of the invention include identifying all vBlock sequences from the sequencing output that includes the amplified vBlocks and the amplified biological sequences.
  • the vBlocks are identified through statistical methods that identify the presence of randomer sequences versus the absence of randomer sequences in the amplified biological sequences.
  • the unique combination of each V gene and J gene IDs are also identified, thus allowing for the identification and segregation of all vBlocks and further allowing for the identification of each V/J combination displayed in each vBlock.
  • vBlock sequence reads are extracted from the sequencing file and clustered.
  • an algorithm is used for separating vBlock sequences from a data file that includes biological sequences.
  • First pass Compare read vs. vBlock sequences by Hamming metric.
  • the Hamming distance between two strings of equal length is the number of positions at which the corresponding symbols are different. Any read with a Hamming distance ⁇ the ⁇ max_dist parameter is considered matched with a vBlock.
  • the random oligonucleotide sequence is identified by recording the read sequence at the expected location of the random oligonucleotide sequences in the best-matching vBlock sequence.
  • Second pass For reads that did not find a good match by Hamming distance, repeat the read vs. vBlock comparison with a Levenshtein metric.
  • the Levenshtein distance is a string metric for measuring the difference between two sequences. Any read with Levenshtein distance ⁇ the ⁇ max_dist parameter is considered matched with a vBlock with indels (insertion/deletions). In this case, the random oligonucleotide sequence is identified by accounting for the locations of indels in the sequence alignment.
  • Methods of the invention include calculating normalization factors for all possible V/J gene combinations.
  • a normalization factor is a number that, when multiplied by the read count of a sequence, changes the read count to the value that would be expected if there were no PCR amplification bias. For example, genes that tend to under-amplify will have numbers greater than one so that the (read count ⁇ normalization factor) product is larger than the original read count.
  • the normalization factor is the reciprocal of the amplification factor, as described below.
  • the normalization method includes the following steps:
  • V and J genes Compute normalization factors for J genes using the same approach as above, with V and J genes reversing roles.
  • the reference V genes are TCRBV03-1 and TCRBV21.
  • This method produces a normalization factor for each V gene and J gene.
  • the synthetic template molecules can be used to quantify the number of input templates in an immunosequencing experiment.
  • Methods for multiplex PCR amplification and high throughput sequencing (“immunosequencing”) are described in detail, at least in U.S. Ser. No. 12/794,507 and U.S. Ser. No. 13/217,126, which are each incorporated by reference in its entirety.
  • a PCR assay is used to select a CDR3 region from rearranged TRB chains amplifies a 110 base pair (bp) fragment. Since the region of interest (ROI) is approximately 110 bp, the primer pairs used to estimate the total numbers of input genomes are also required to amplify approximately 110 bp regions of the genome. To use sequencing by synthesis, the primer pairs also need 5′ adaptor sequences. These adaptor sequences can either be sequencing by synthesis adaptors or be universal primers that then can be used to apply sequencing by synthesis adaptors. In this embodiment, the primers include 5′ pGEX universal primer flaps.
  • the sequencing by synthesis adaptors can then be added with a second PCR reaction using these universal primers (SEQ ID NOs:765-786).
  • SEQ ID NOs:765-786 Methods for using universal primers in high-throughput sequencing to amplify rearranged TCR and IG receptors are described in U.S. Ser. No. 12/794,507 and U.S. Ser. No. 13/217,126, which are each incorporated by reference in its entirety.
  • the method includes designing synthetic control templates.
  • the synthetic templates are designed to ensure that the primer pairs amplify the synthetic templates with the same efficiency as the genomic regions. To do this, the synthetic templates are required to include the same priming sites as the genome, and the primer pairs must amplify the same sized region. Additionally, the synthetic templates must also include an internal string of nucleotide sequences that differentiates the sequences derived from the synthetic sequences from those derived from the genome. While the number of required nucleotides can be one base pair, in one embodiment, the amplified sequences of the synthetic sequences can differ by 26 base pairs from the amplified sequences derived from the genome.
  • the synthetic templates can either be designed as double stranded DNA (e.g., ordered from a company like Integrated DNA Technologies) and require no processing, or be designed as a series of primers or one long primer (e.g., ordered from a primer synthesis company like IDT or Invitrogen), and be amplified to obtain double stranded DNA.
  • extremely long singled stranded primers were designed (and ordered from Integrated DNA Technologies).
  • these synthetic templates include 5′ and 3′ priming regions that permitted amplification to generate double stranded DNA.
  • the PCR reaction includes enzyme, template and primers, which include the ROI primers.
  • the assay includes a multiplex set of primers to amplify 110 base pairs of the CDR3 region of the rearranged TRB locus, the genomic control primer pair(s), and a known or knowable number of synthetic template(s).
  • a second PCR reaction is used to add sequencing by synthesis adaptors. The library is then sequenced, for example, using a sequencing by synthesis method.
  • the total number of synthetic sequences for each synthetic template is counted. Because the number of synthetic templates added to the PCR is known, either by template design or by careful molecular biology technique, the coverage, which is number of copies sequenced of each synthetic template, can be calculated. The coverage can then be used to estimate the number of input genomes. Because the primer pairs amplify the synthetic and biologic templates with the same affinity, the synthetic template coverage also represents the coverage of the biologic templates. Given this, to calculate the total number of input genomes, one can divide the total number of biologic sequences by the coverage. This is repeated for each unique region of the genome sampled.
  • the method includes the following calculations:
  • this process could be repeated for each unique region of the genome sampled. For example, if there are 7 unique primer pairs amplifying 7 regions of the genome, one can obtain 7 identical but independent measures of the number of input genomes.
  • One embodiment of the invention includes primers and synthetic templates for not just one genomic region, but primer pairs and synthetic templates for many genomic regions. While this embodiment requires more sequencing reads for each sample, it allows independent measures of genome input.
  • Another embodiment of the invention that increases the accuracy of the method is to increase the number of unique synthetic templates underlying each marker (each primer pair has many synthetic templates).
  • One embodiment includes increasing the number of synthetic templates to include a string of random nucleotides between the primer pairs.
  • the method includes using 10 random nucleotides, which increases the number of unique synthetic templates for every primer pair from 1 to 1,048,576 unique templates.
  • fewer than 10,000 unique synthetic templates are added to the PCR reaction, ensuring that each synthetic template is a unique sequence. This providesakily accurate counting of the number of input synthetic templates.
  • the equation to calculate coverage is:
  • Coverage number of total synthetic sequences/number of unique synthetic sequences.
  • Another method includes increasing the number of reactions per sample from one to two.
  • one reaction includes a large volume of template and the primers for the ROI.
  • the other reaction includes a smaller but consistent volume (1 ⁇ 2, 1 ⁇ 4, 1 ⁇ 8, or 1/16 of the volume of template used for the ROI) of template and the primers and synthetic templates to estimate the total number of genomes.
  • the equation to calculate the number of input genomes added to the ROI reaction is modified to:
  • the method maintains using one PCR reaction to ampli, both the ROI and regions to estimate the total number of genomes.
  • reducing the number of sampled genome sequences is accomplished by modifying the 5′ adaptor sequences on the primer pair(s) used to amplify the genomic regions.
  • the primer pairs use two or more 5′ adaptor sequences.
  • One of the 5′ adaptor sequence is identical to the 5′ adaptor sequence used on the ROI primers.
  • the rest of the 5′ adaptor sequences use a different sequence (one to many).
  • the sequencing by synthesis adaptors are added to the PCR amplicons with a second PCR, only the adaptor sequence used by the ROI is included.
  • the amplicons with the 5′ adaptor sequence that matches the ROI will undergo sequencing by synthesis adaptor. This will sub-sample the genomic sequencing templates.
  • Number of input genomes (total number of biologic sequences/coverage)*(5′ adaptor sequence of interest/total genome sequencing primers).
  • SEQ ID NOs:3254-3268 demonstrate exemplary sequences for amplified gene segments, gene specific forward and reverse primers, and housekeeping gene as a synthetic control, as used in the invention.
  • SEQ ID NOs:3269-3274 demonstrate examples of primers with adaptor (pGEXFGAPDPH_108 bp_F and pGEXR_GAPDPH_108 bp_R), exemplary adaptor sequences (Adaptor primer SEQ pGEXF, Adaptor primer SEQ pGEXR), and sequencing by synthesis adaptors (OligoC_PERead2Seq_N6_WD565_pGEXr and OligoD_PERead1Seq_WD565_N6.pGEXf).
  • Synthetic template molecules that include random oligonucleotide sequences were tested in methods for minimizing amplification bias and compared with synthetic template molecules that do not include random oligonucleotide sequences (called “gBlocks” herein).
  • the synthetic template molecules called gBlocks provide a benchmark for synthetic template molecules used for measuring and minimizing amplification bias of multiplex PCR primers.
  • Each synthetic template may can be synthesized as 495 base pair oligonucleotides with the following structure (5′ to 3′): (1) a universal adaptor sequence (UA), (2) a 16 base pair barcode identifying V and J segments, (3) a V gene (about 300 base pairs), (4) a 9 base pair synthetic template internal marker (IM). (5) a repeat of the 16 base pair barcode, (6) a string of 12 random oligonucleotides (N12), (7) a J gene (about 100 base pairs), (8) a repeat of the 16 base pair barcode, and (9) a universal adaptor sequence (UB).
  • U universal adaptor sequence
  • N12 a string of 12 random oligonucleotides
  • J gene about 100 base pairs
  • (8) a repeat of the 16 base pair barcode and (9) a universal adaptor sequence (UB).
  • vBlocks and gBlocks were evaluated to determine if the same amplification factors and normalization factors would be determined in the absence of the randomer sequence.
  • Two PCR runs were utilized: the first run used 5, 812 unique vBlock molecules, and the second run utilized 1, 245 unique vBlock molecules.
  • the amplification bias for each of the vBlocks and gBlocks across both runs were determined to be similar, as depicted in FIG. 2 .
  • Each point represents the average amplification bias observed for synthetic templates with a given V gene (darker shade) or J gene (lighter shade).
  • the legend on each plot shows the squared Pearson correlation (R 2 ) between amplification bias measurements from vBlocks and gBlocks. The correlation is stronger in the left-hand plot because PCR Run1 included a larger number of vBlocks.
  • the vBlocks produced measurements of primer amplification bias that were consistent with estimates from gBlocks, consistent across different reference V and J genes, and consistent across both PCR runs.
  • Example 2 Determining Normalization Factors in Correcting for Amplification Bias in Amplification of Polynucleotides in Adaptive Immune Cells
  • vBlocks and rearranged biological molecules of CDR3 regions of T cells were amplified in multiplex PCR reactions and sequenced using the methods described above.
  • the data from the vBlock sequence reads are extracted from the sequencing file and clustered together if they are determined to share the same randomer sequence.
  • Two statistical passes were used to identify vBlocks. The first pass used the Hamming metric to compare read sequences versus vBlock sequences, wherein the randomer sequence was identified by recording the read sequence at the expected location of the randomer sequences in the best-matching vBlock sequence.
  • the second pass was utilized for reads that did not find a good match by the Hamming metric.
  • the Levenshtein metric was used in this instance, wherein the randomer sequence was identified by accounting for the locations of the indels in the sequence alignment. Upon completion of the two statistical passes, the reads identified as vBlocks were clustered together by collapsing sequences that shared the same randomer sequence.
  • the amplification bias was determined by determining the read count of each collapsed vBlock sequence comprising a unique V/J combination, and mapping the read count of each biological output sequence to the corresponding vBlock containing the same V/J combination.
  • the normalization factors for the V genes were calculated by computing the mean read count for each observed vBlock with a unique V gene, which was accompanied by a reference J gene. Thus, the mean read counts for each unique V/J combo were determined and compiled in a list of mean read counts for vBlocks comprising the specific V gene. From each of these compiled lists, the overall mean of the mean read counts from all unique V genes and reference J genes was calculated.
  • the mean read count for this V/J combo was divided by the overall mean of the mean read counts, thus arriving at the amplification factor for a unique V gene and each reference J gene.
  • the mean of the amplification factors for each combination of a unique V gene with different reference J genes was calculated and then the reciprocal was taken; thus producing the normalization factor for the unique V gene.
  • the normalization factors for each of the unique J genes were also calculated using the same approach as above, with the V and J genes reversing roles. The number of reads of each unique V/J combination were then multiplied by the specific normalization factors, thus arriving at an accurate read that has been corrected for amplification bias.
  • Example 3 Determining the Number of Input Genomes from a Sample of Adaptive Immune Cells
  • synthetic templates and genomic control genes were used to accurately calculate the relative representation of adaptive immune cells in a sample containing adaptive immune cells and non-adaptive immune cells.
  • T cells were isolated from whole blood using standard cell biology techniques. DNA was extracted from the population of purified T cells. DNA was normalized, assuming 6.4 pg DNA/double stranded human genome such that approximately 5 genomes, 250 genomes, 1250 genomes, or 6250 genomes of T cell DNA were added to a standard TCRB PCR reaction.
  • TCRB Assay Rearranged TCRB genes were amplified using a multiplex PCR. V segment and J segment primers were designed to amplify ⁇ 110 bp rearranged fragments. Synthetic templates were added to each PCR reaction and were amplified with the same primers, and the synthetic templates included a barcode to differentiate them from biologic templates. The volume of DNA necessary to add 5, 250, 1250, and 6250 genomes were added to each PCR reaction.
  • a second PCR tailing reaction was performed using tailing primers comprising well-specific barcodes and Illumina sequencing adaptors.
  • the PCR tailing reaction added well-specific barcodes and Illumina sequencing adaptors to each PCR product.
  • each single copy autosomal locus is present in every cell and serves as a genomic control.
  • the genomic controls were used to count the number of genomes present in the sample.
  • Primers were designed to amplify 110 bp fragments of each locus, which were the same size as the TCRB primers.
  • the multiplex PCR reaction included co-amplification of synthetic templates that include oligonucleotide sequences of each of the five autosomal genes.
  • the synthetic templates included unique barcodes that identify the molecules as synthetic templates and a 6 bp random sequence.
  • the same concentration of DNA for genomic controls was used as the TCRB genes, but at an eighth of the volume, such that less than 1 genome, 31, 156, 781 double stranded genomes were added to each PCR reaction.
  • Well specific barcodes and Illumina sequencing adaptors were added to each PCR product in a second tailing PCR assay, as described above.
  • Sequencing coverage is an estimate of the number of sequencing clusters derived from a single molecule added to the PCR reaction.
  • the number of TCRB molecules in the sample was estimated using the methods described above.
  • the number of genomes added to the TCRB assay was determined by estimating the number of genomes in the genomic control assay as previously described (Section III).
  • the calculated number of genomes from the genomic control assay was scaled by 4 to account for 1) that there were 2 loci/genome and 2) the eight fold reduction of input ( FIG. 6 ).

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