US20140057799A1 - System and Methods for Massively Parallel Analysis of Nucleic Acids in Single Cells - Google Patents

System and Methods for Massively Parallel Analysis of Nucleic Acids in Single Cells Download PDF

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US20140057799A1
US20140057799A1 US13/993,047 US201113993047A US2014057799A1 US 20140057799 A1 US20140057799 A1 US 20140057799A1 US 201113993047 A US201113993047 A US 201113993047A US 2014057799 A1 US2014057799 A1 US 2014057799A1
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nucleic acid
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David Scott Johnson
Everett Hurteau Meyer
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Gigagen Inc
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Definitions

  • the invention relates to the fields of molecular biology and molecular diagnostics, and more specifically to methods for massively parallel genetic analysis of nucleic acids in single cells.
  • PGD pre-implantation genetic diagnosis
  • a single cell is removed from a cleavage stage human embryo for genome-wide analysis of genetic diseases (Johnson et al., 2010 Human Reproduction 25:1066-75).
  • Applications such as PGD require time-consuming, hand-guided biopsy technology, and the largest studies include hundreds of single cells.
  • genetic recombination between loci of interest can be measured in single sperm cells (Jiang et al., 2005 Nucleic Acids Research 33:e91), but a manual analysis of thousands of single sperm would be time-consuming and impractical.
  • FACS fluorescence-activated cell sorting
  • Single cells can also be used as reaction compartments for performing various genetic analyses (Embleton et al., 1992 Nucleic Acids Research 20:3831-37; Hviid, 2002 Clinical Chemistry 48:2115-2123; U.S. Pat. No. 5,830,663). Single cells can be sorted in aqueous-in-oil microdroplet emulsions, and molecular analyses can be performed in the microdroplets (Johnston et al., 1996 Science 271:624-626; Brouzes et al., 2009 PNAS 106:14195-200; Kliss et al., 2008 Anal Chem 80:8975-81; Zeng et al., 2010 Anal Chem 82:3183-90).
  • single cell assays are limited to single cell PCR in emulsions, or in situ PCR in single fixed and permeabilized cells. Moreover, when analyzing large populations of cells, it is difficult to trace back each gene product to a single cell or subpopulations of cells.
  • the method includes providing a providing a first set of nucleic acid probes, the first set comprising a first probe comprising a sequence that is complementary to a first target nucleic acid subsequence, a second probe comprising a sequence that is complementary to a second subsequence of the first target nucleic acid and a second sequence that is complementary to an exogenous sequence, a third probe comprising the exogenous sequence and a sequence that is complementary to a first subsequence of a second target nucleic acid, and a fourth probe comprising a sequence that is complementary to a second subsequence of the second target nucleic acid sequence.
  • the method includes isolating the single cells with at least one set of nucleic acid probes; amplifying the first and second target nucleic acid sequences independently, wherein the first target nucleic acid sequence is amplified using the first probe and the second probe, and wherein the second target nucleic acid sequence is amplified using the third probe and the fourth probe; hybridizing the exogenous sequence to its complement; and amplifying the first target nucleic acid sequence, the second target nucleic acid sequence, and the exogenous sequence using the first and fourth probes, thereby generating a fused complex.
  • the method also provides performing a bulk sequencing reaction to generate sequence information for at least 100,000 fused complexes from at least 10,000 cells within the population of cells, wherein the sequence information is sufficient to co-localize the first target nucleic acid sequence and the second target nucleic acid sequence to a single cell from the population of at least 10,000 cells.
  • the single cell is isolated in an emulsion microdroplet. In another aspect, the single cell is isolated in a reaction container.
  • the amplifying step includes performing a polymerase chain reaction, wherein the amplifying step comprises performing a polymerase chain reaction, and wherein the first and third probes are forward primers and the second and fourth probes are reverse primers for the polymerase chain reaction.
  • the amplifying step includes performing a polymerase chain reaction, wherein the first and third amplification primers are forward primers and the second and fourth amplification primers are reverse primers for the polymerase chain reaction.
  • the amplifying step comprises performing a ligase chain reaction.
  • the amplifying step can include performing a polymerase chain reaction, a reverse-transcriptase polymerase chain reaction, a ligase chain reaction, or a ligase chain reaction followed by a polymerase chain reaction.
  • the fused complex is circular.
  • the first or second target nucleic acid sequence is an RNA sequence.
  • the first or second target nucleic acid sequence can also be a DNA sequence.
  • the first or second target nucleic acid sequence comprises a T-cell receptor sequence.
  • the first target nucleic sequence, the second target nucleic acid sequence or both target nucleic acid sequences comprises an immunoglobulin sequence.
  • the first target nucleic acid comprises a T-cell receptor sequence
  • the second target nucleic sequence comprises a second molecule that is associated with immune cell function.
  • the first target nucleic acid sequence comprises an immunoglobulin sequence
  • the second sequence comprises a second molecule associated with immune cell function.
  • the second molecule associated with immune cell function is selected from the group consisting of: interleukin-2 (IL-2), interleukin-4 (IL-4), interferon gamma (IFN ⁇ ), interleukin-10 (IL-10), interleukin-1 (IL-1), interleukin-13 (IL-13), interleukin-17 (IL-17), interleukin-18 (IL-18), tumor necrosis factor alpha (TNF ⁇ ), tumor necrosis factor beta (TNF ⁇ ), T-box transcription factor 21 (TBX21), forkhead box P3 (FOXP3), cluster of differentiation 4 (CD4), cluster of differentiation 8 (CD8), cluster of differentiation 1d (CD 1d), cluster of differentiation 161 (CD 161), cluster of differentiation 3 (CD3), major histocompatibility complex (MHC), cluster of differentiation 19 (CD19), interleukin 7 receptor (IL-17 receptor), cluster of differentiation 10 (CD10), cluster of differentiation 20 (CD20), cluster of differentiation 22 (CD22), cluster of differentiation 34 (CD34), cluster of differentiation 27 (CD
  • the first or second target nucleic acid includes a rare gene sequence.
  • the rare gene sequence is present in fewer than 5% of the cells, fewer than 1% of the cells, or fewer than 0.1% of the cells.
  • the rare gene sequence results from a genetic mutation.
  • the genetic mutation is a somatic mutation.
  • the genetic mutation is a mutation in a gene selected from the group consisting of epidermal growth factor receptor (EGFR), phosphatase and tensin homolog (PTEN), tumor protein 53 (p53), MutS homolog 2 (MSH2), multiple endocrine neoplasia 1 (MEN1), adenomatous polyposis coli (APC), Fas receptor (FASR), retinoblastoma protein (Rb1), Janus kinase 2 (JAK2), (ETS)-like transcription factor 1 (ELK1), v-ets avian erythroblastosis virus E26 oncogene homolog 1 (ETS1), breast cancer 1 (BRCA1), breast cancer 2 (BRCA2), hepatocyte growth factor receptor (MET), ret protoco-oncogene (RET), V-erb-b2 erythroblastic leukemia viral oncogene homolog 2 (HER2), V-Ki-ras2 Kirsten rat
  • the mutation is associated with a disease, and in one embodiment, the disease is cancer.
  • the cancer is a cancer selected from the group consisting of lung carcinoma, non-small cell lung cancer, small cell lung cancer, uterine cancer, thyroid cancer, breast carcinoma, prostate carcinoma, pancreas carcinoma, colon carcinoma, lymphoma, Burkitt lymphoma, Hodgkin lymphoma, myeloid leukemia, leukemia, sarcoma, blastoma, melanoma, seminoma, brain cancer, glioma, glioblastoma, cerebellar astrocytoma, cutaneous T-cell lymphoma, gastric cancer, liver cancer, ependymona, laryngeal cancer, neck cancer, stomach cancer, kidney cancer, pancreatic cancer, bladder cancer, esophageal cancer, testicular cancer, medulloblastoma, vaginal cancer, ovarian cancer, cervical cancer, bas
  • the method can include in certain embodiments fixing and permeabilizing the cells prior to performing the amplification step.
  • the method can also include lysing the cells prior to performing the amplification step and quantifying the sequence information generated from the bulk sequencing reaction.
  • the method for analyzing the single cell includes a single cell contained within a population of at least 25,000 cells, at least 50,000 cells, at least 75,000 cells, or at least 100,000 cells.
  • the single cell is a unique cell with respect to the remaining cells in the population.
  • the single cell is a representative of a subpopulation of cells within the population. The population can be considered in some embodiments to be the total number of cells analyzed in a method of the invention.
  • performing the bulk sequencing reaction to generate sequence information is carried out for at least 1,000,000 fused complexes from at least 10,000 cells within the population of cells.
  • the method includes providing a second set of nucleic acid probes, the second set comprising a fifth probe comprising a sequence that is complementary to a third target nucleic acid subsequence, a sixth probe comprising a sequence that is complementary to a second subsequence of the third target nucleic acid sequence and a second sequence that is complementary to a second exogenous sequence, a seventh probe comprising the exogenous sequence and a sequence that is complementary to a first subsequence of a fourth target nucleic acid sequence, and an eighth probe comprising a sequence that is complementary to a second subsequence of the fourth target nucleic acid sequence.
  • the method also provides isolating the single cells with the first and second sets of nucleic acid probes; amplifying the third and fourth target nucleic acid sequences independently, wherein the third target nucleic acid sequence is amplified using the fifth probe and the sixth probe, and wherein the fourth target nucleic acid sequence is amplified using the seventh probe and the eighth probe; hybridizing the exogenous sequence to its complement; amplifying the third target nucleic acid sequence, the fourth target nucleic acid sequence and the exogenous sequence using the fifth and eighth probes, thereby generating a fused complex; and performing a bulk sequencing reaction to generate sequence information for at least 100,000 fused complexes from at least 10,000 cells within the population of cells, wherein the sequence information is sufficient to co-localize the first target nucleic acid sequence, the second target nucleic acid sequence, the third target nucleic acid sequence, and the fourth target nucleic acid sequence to a single cell from the population of at least 10,000 cells.
  • the first target nucleic acid sequence and the third target nucleic acid sequence are the same. In other aspects, the first target nucleic acid sequence and the third target nucleic acid sequence are different.
  • the method includes providing N sets of nucleic acid probes, wherein each of the N sets comprise an I 1 probe comprising a sequence that is complementary to an I a target nucleic acid first subsequence, an I 2 probe comprising a sequence that is complementary to an I a target nucleic acid second subsequence and a second sequence that is complementary to an I exogenous sequence, an I 3 probe comprising the I exogenous sequence and a sequence that is complementary to an I b target nucleic acid first subsequence, and an I 4 probe comprising a sequence that is complementary to an I b target nucleic acid second subsequence, wherein I ranges from 1 to N
  • the method also includes isolating the single cells with the N sets of nucleic acid probes; amplifying for all values of I, the I a and I b target nucleic acid sequences independently, wherein the I a target nucleic acid sequence is amplified using the I 1 probe and the I 2 probe and the I b target nucleic acid sequence is amplified using the I 3 probe and the I 4 probe; hybridizing the I exogenous sequence to its complement; amplifying for each I, the I a target sequence, the I b target sequence and the I exogenous sequence using the I 1 and I 4 probes, thereby generating N fused complexes; and performing a bulk sequencing reaction to generate sequence information for at least 100,000 fused complexes from at least 10,000 cells within the population of cells, wherein the sequence information is sufficient to co-localize the N I a target nucleic acid sequence and the I b target nucleic acid sequence to a single cell from the population of at least 10,000 cells.
  • N is less than or equal to 10, less than or equal to 100, less than or equal to 1000, less than or equal to 10,000, less than or equal to 100,000 or N represents all of the polyadenylated transcripts in a cell.
  • the method includes introducing a unique barcode sequence comprising at least six nucleotides into each of the plurality of single cells, wherein each barcode sequence is selected from a pool of barcode sequences with greater than 1000-fold diversity in sequences.
  • the method includes providing at least one set of nucleic acid probes.
  • the method includes steps for analyzing at least two nucleic acid sequences in a single cell contained within a population of at least 10,000 cells, comprising isolating each of a plurality of single cells from a population of at least 10,000 cells in an emulsion microdroplet or a reaction container.
  • the method includes introducing a unique barcode sequence comprising at least six nucleotides into each of the plurality of single cells, wherein each barcode sequence is selected from a pool of barcode sequences with greater than 1000-fold diversity in sequence.
  • the method For each of the plurality of single cells, the method provides at least one set of nucleic acid probes, the set comprising a first probe comprising a sequence that is complementary to a nucleic acid sequence that is located at the 5′ end of the barcode sequence, a second probe comprising a sequence that is complementary to a nucleic acid sequence that is located at the 3′ end of the barcode sequence and a second region of sequence that is complementary to a non-human, exogenous sequence, a third probe comprising a sequence that comprises the non-human, exogenous sequence and a sequence that is complementary to a first subsequence of a second target nucleic acid sequence, and a fourth probe comprising a sequence that is complementary to a second subsequence of the second target nucleic acid sequence.
  • the method continues by amplifying the first and second nucleic acid sequences independently, wherein the first target nucleic acid sequence is amplified using the first probe and the second probe, and wherein the second target nucleic acid sequence is amplified using the third probe and the fourth probe; hybridizing the exogenous sequence to its complement; amplifying the first target nucleic acid sequence, the second target nucleic acid sequence, and the exogenous sequence using the first and fourth probes; performing bulk sequencing of the fused complexes; and identifying a single cell for each of the fused complexes based on the barcode sequence.
  • the barcode sequence is affixed to a bead or a solid surface.
  • the bead or the solid surface can be isolated in the emulsion microdroplet or the reaction container.
  • the method includes introducing a unique barcode sequence comprises fusing the emulsion microdroplet or a reaction container comprising the single cell with the emulsion microdroplet or a reaction container comprising the barcode sequence affixed to the bead or the solid surface.
  • the second target nucleic acid sequence can be complementary to an RNA sequence.
  • the second target nucleic acid sequence can be complementary to a DNA sequence.
  • amplifying comprises performing a polymerase chain reaction, performing a ligase chain reaction, or performing by ligase chain reaction followed by polymerase chain reaction.
  • the single cell is contained within a population of at least 25,000 cells. In other embodiments, the single cell is contained within a population of at least 50,000 cells. The single cell can be contained within a population of at least 75,000 cells or within a population of at least 100,000 cells.
  • the method also includes quantifying the fused complexes.
  • the fused complexes are circular.
  • the method includes providing N sets of nucleic acid probes, wherein each of the N sets comprise an I 1 probe comprising a sequence that is complementary a first subsequence of a barcode sequence, an I 2 probe comprising a sequence that is complementary to a second subsequence of the barcode sequence and a second sequence that is complementary to an I exogenous sequence, an I 3 probe comprising the I exogenous sequence and a sequence that is complementary to an I b target nucleic acid first subsequence, and an I 4 probe comprising a sequence that is complementary to an I b target nucleic acid second subsequence, wherein I ranges from 1 to N.
  • the method also provides isolating the single cells with the N sets of nucleic acid probes; amplifying for all values of I, the barcode sequence and the I b target nucleic acid sequences independently, wherein the barcode sequence is amplified using the I 1 probe and the I 2 probe and the I b target nucleic acid sequence is amplified using the I 3 probe and the I 4 probe; hybridizing the I exogenous sequence to its complement; amplifying for each I, the barcode sequence, the I b target sequence and the I exogenous sequence using the I 1 and I 4 probes, thereby generating N fused complexes; and performing a bulk sequencing reaction to generate sequence information for at least 100,000 fused complexes from at least 10,000 cells within the population of cells, wherein the sequence information is sufficient to co-localize the barcode sequence and the I b target nucleic acid sequence to a single cell from the population of at least 10,000 cells.
  • N is less than or equal to 10, less than or equal to 100, less than or equal to 1000, less than or equal to 100,000, or N represents all of the polyadenylated transcripts in a cell.
  • the barcode sequence is the same sequence for all N.
  • the invention also provides a method for introducing said barcode sequences into reaction containers or emulsion microdroplets.
  • the method includes providing a pool of unique barcode sequences, wherein each barcode sequence is linked to a selection resistance gene.
  • the method also includes providing a population of single cells, transfecting the population of single cells with the pool of unique barcode sequences, selecting cells containing a unique barcode sequence and the selection resistance gene, and isolating each of the selected cells into reaction containers or emulsion microdroplets.
  • the selection resistance gene can encode resistance to gentamycin, neomycin, hygromycin, or puromycin, for example.
  • FIG. 1A shows an example of sequence linkage in a single cell by intra-cellular multiprobe circularization of a molecular complex, according to one embodiment of the invention.
  • Each probe has a region of complementarity to each of the target loci.
  • the complex includes two nucleic acid probes (a and b) and two target nucleic acids (c and d).
  • the single cell (e) can be contained in a reaction container or an emulsion droplet (j).
  • FIG. 1B illustrates an example of sequence linkage in a single cell (also in a reaction container or emulsion droplet (j)) by intra-cellular multiprobe circularization of a complex, according to one embodiment of the invention.
  • the two nucleic acid probes (a and b) are hybridized to the complementary regions of the two target nucleic acids (c and d).
  • FIG. 1C illustrates an example of circularization of a probe-target linkage complex occurs by amplification, according to one embodiment of the invention.
  • FIG. 2 is an example of amplification of a circularized probe-target linkage complex (a) using a polymerase (b), according to one embodiment of the invention.
  • a ⁇ -29 polymerase is used in a mediated rolling circle amplification, and copies (b and c) of the circularized probe-target complex are generated.
  • FIG. 3 illustrates an example of amplification of a circularized probe-target linkage complex (a) using a polymerase (b) and primers (c and d), according to one embodiment of the invention.
  • the primers (c and d) are used to amplify the region of the circularized probe-target complex that is complementary to the target nucleic acid.
  • Multiple copies (e) of a linear double-stranded polynucleic acid amplicon are generated and sequenced in bulk.
  • FIG. 4 illustrates an example of amplification of a circularized probe-target linkage complex (a) in a single cell (b), according to one embodiment of the invention.
  • Amplification occurs by transformation into bacteria and subsequent selection with antibiotics.
  • the amplicon (a) contains an antibiotic resistant gene and cells (c) that are transformed with the amplicon are selected in the presence of antibiotics. Cells without the circularized probe-target complex (d) are not selected.
  • FIG. 5A shows an example of single cell sequence linkage by intracellular overlap extension polymerase chain reaction, according to one embodiment of the invention.
  • a forward primer (a) targets one locus of a first target nucleic acid (g).
  • a reverse primer (b) targets another locus of the first target nucleic acid (g) and has a region of complementarity (c) to a region (d) of the forward primer (e).
  • the forward primer (e) has a region of complementarity to the second target nucleic acid (h) and the reverse primer (f) targets another region of the second target nucleic acid (h).
  • the steps of FIG. 5 can be performed in a reaction container or an emulsion droplet.
  • FIG. 5B illustrates an example of the hybridization of the probes (a, b, e and f) to respective target nucleic acids (g and h), according to one embodiment of the invention.
  • FIG. 6A illustrates an example of the complementary regions (c) and (d) between amplicons (g) and (h), according to one embodiment of the invention.
  • FIG. 6B shows linkage amplification of the amplicons (g) and (h) using polymerase (e) to create a linked major amplicon (i).
  • the end product is a library of “major amplicons” that include the linked amplicons (g) and (h), which can be sequenced in bulk.
  • the steps of FIG. 6 can be performed in a reaction container or an emulsion droplet.
  • FIGS. 7A and 7B illustrate an example of single cell sequence linkage by intracellular ligase chain reaction combined with overlap extension polymerase chain reaction, according to one embodiment of the invention.
  • FIG. 8A shows an example of the complementary regions between amplicons (a) and (d), according to one embodiment of the invention.
  • FIG. 8B shows linkage amplification of the amplicons using polymerase (e) to create a linked major amplicon.
  • the steps of FIGS. 7 and 8 can be performed in a reaction container or an emulsion droplet.
  • FIG. 9A shows an example of a linked amplicon (f), according to one embodiment of the invention.
  • FIG. 9B shows the resulting amplicon produced from the steps shown in FIGS. 8 A and 8 B.
  • the end product can be a library of “major amplicons” and are be sequenced in bulk.
  • FIG. 10 illustrates an example of the components required for a single cell sequence linkage by padlock probes combined with overlap extension polymerase chain reaction, according to one embodiment of the invention.
  • FIG. 11 shows the complementary regions between a first padlock probe (a) and the first target nucleic acid (c) and between a second padlock probe (b) and a second target nucleic acid (d) in a single cell, according to one embodiment of the invention.
  • FIG. 12 illustrates the resulting circularized amplicons (g) and (h) and the primers that are used to amplify the circularized amplicons, according to one embodiment of the invention.
  • FIG. 13 shows an example of the resulting amplicons from amplification of the circular probes (g) and (h), according to one embodiment of the invention.
  • FIG. 14 shows an example of overlap extension PCR amplification of the amplicons using a polymerase (e), according to one embodiment of the invention.
  • FIG. 15 illustrates an example of plasmid library deconvolution by barcoded tailed end (5′-end barcoded) polymerase chain reaction, which is followed by bulk sequencing and informatics, according to one embodiment of the invention.
  • the barcode sequence can be traced back to a well and plate position, the barcode sequence can then be traced to a nucleic acid sequence, and the nucleic acid sequence is traced back to a well.
  • Each of the primers in (a) and (b) have a 5′-end barcoded tag.
  • the target nucleic acids in (c) and (d) are amplified using the primers in (a) and (b).
  • the steps can be performed in enclosed containers or emulsion droplets, as shown in (c) and (d).
  • FIG. 16 shows an example of amplification (e, f) of two target nucleic acids (A and B) using primers that include barcode sequences, according to one embodiment of the invention.
  • the resulting amplicons that include the barcode sequences are shown in (g) and (h).
  • FIG. 17 shows a simplified example of tracing back a barcode sequence in an amplicon to a cell target (A or B), and tracing back the cell target to a physical location (c, d) (e.g., a well), according to one embodiment of the invention.
  • FIG. 18 illustrates molecular linkage between two transcripts (g and h) and a molecular barcode sequence (k), according to one embodiment of the invention.
  • FIG. 19 shows an example of amplification of the target nucleic acids (g and h) using primers as shown, according to one embodiment of the invention.
  • FIG. 20 shows an example of amplicons resulting after amplification of two target nucleic acids and a barcode sequence (k), according to one embodiment of the invention.
  • FIG. 21 illustrates a fused amplicon that includes sequences of two target nucleic acids (g and h) and a barcode sequence (k) inside an emulsion droplet or reaction container (j), according to one embodiment of the invention.
  • the fused (“major”) amplicon can be isolated by reverse emulsion and bulk sequenced.
  • FIG. 22 is an example of molecular linkage between two transcripts (g and h) and a molecular barcode sequence (k) attached to a bead (m), according to one embodiment of the invention.
  • FIG. 23 illustrates the forward and reverse primers that are used in a molecular linkage between two transcripts (g and h) and a molecular barcode sequence (k) attached to a bead (m), according to one embodiment of the invention.
  • FIG. 24 shows an example of amplicons resulting after amplification of two target nucleic acids and a barcode sequence (k) attached to a bead (m), according to one embodiment of the invention.
  • FIG. 25 illustrates a fused amplicon that includes sequences of two target nucleic acids (g and h) and a barcode sequence (k), inside an emulsion droplet or reaction container (j), according to one embodiment of the invention.
  • the fused (“major”) amplicon can be isolated by reverse emulsion and bulk sequenced.
  • FIG. 26 is an example of single cell sequence linkage by ligase chain reaction combined with overlap extension polymerase chain reaction, as applied to a method for noninvasive prenatal diagnosis, according to one embodiment of the invention.
  • FIG. 27 shows an example of hybridization of primers and target nucleic acids in a single cell sequence linkage by ligase chain reaction combined with overlap extension polymerase chain reaction, as applied to a method for noninvasive prenatal diagnosis, according to one embodiment of the invention.
  • the process is carried out in an emulsion droplet or reaction container (k).
  • FIG. 28 shows an example of resulting amplicons produced in a single cell sequence linkage by ligase chain reaction combined with overlap extension polymerase chain reaction, as applied to a method for noninvasive prenatal diagnosis, according to one embodiment of the invention.
  • FIG. 29 shows hybridization of overlapping complementary regions of the resulting amplicons, and overlap extension polymerase chain reaction, as applied to a method for noninvasive prenatal diagnosis, according to one embodiment of the invention.
  • FIG. 30 shows the resulting amplicons from the overlap extension polymerase chain reaction, as applied to a method for noninvasive prenatal diagnosis, according to one embodiment of the invention.
  • the end product is a library of “major amplicons”, or linked loci, which can then be sequenced in bulk.
  • FIG. 31 shows a simplified workflow for high-throughput generation of TCR ⁇ repertoire libraries, according to one embodiment of the invention.
  • Genetic loci of interest are targeted in a single cell using specially-designed probes, and a fusion complex is formed by molecular linkage and amplification techniques. Multiple genetic loci can be targeted, and many sets of probes can be multiplexed by PCR into a single analysis, such that several loci or even the entire transcriptome or genome is analyzed.
  • the invention is useful for analyzing genetic information in single cells in a high-throughput, parallel fashion for a large quantity of cells (10 4 or greater cells).
  • the invention is also useful for tracing genetic information back to a cell or population of cells using unique barcode sequences.
  • cell refers to a functional basic unit of living organisms.
  • a cell includes any kind of cell (prokaryotic or eukaryotic) from a living organism. Examples include, but are not limited to, mammalian mononuclear blood cells, yeast cells, or bacterial cells.
  • PCR refers to a molecular biology technique for amplifying a DNA sequence from a single copy to several orders of magnitude (thousands to millions of copies). PCR relies on thermal cycling, which requires cycles of repeated heating and cooling of the reaction for DNA melting and enzymatic replication of the DNA. Primers (short DNA fragments) containing sequences complementary to the target region of the DNA sequence and a DNA polymerase are key components to enable selective and repeated amplification. As PCR progresses, the DNA generated is itself used as a template for replication, setting in motion a chain reaction in which the DNA template is exponentially amplified. A heat-stable DNA polymerase, such as Taq polymerase, is used.
  • the thermal cycling steps are necessary first to physically separate the two strands in a DNA double helix at a high temperature in a process called DNA melting. At a lower temperature, each strand is then used as the template in DNA synthesis by the DNA polymerase to selectively amplify the target DNA.
  • the selectivity of PCR results from the use of primers that are complementary to the DNA region targeted for amplification under specific thermal cycling conditions.
  • RT-PCR refers to a type of PCR reaction used to generate multiple copies of a DNA sequence.
  • an RNA strand is first reverse transcribed into its DNA complement (complementary DNA or cDNA) using the enzyme reverse transcriptase, and the resulting cDNA is amplified using traditional PCR techniques.
  • LCR ligase chain reaction
  • emulsion droplet or “emulsion microdroplet” refers to a droplet that is formed when two immiscible fluids are combined.
  • an aqueous droplet can be formed when an aqueous fluid is mixed with a non-aqueous fluid.
  • a non-aqueous fluid can be added to an aqueous fluid to form a droplet.
  • Droplets can be formed by various methods, including methods performed by microfluidics devices or other methods, such as injecting one fluid into another fluid, pushing or pulling liquids through an orifice or opening, forming droplets by shear force, etc.
  • the droplets of an emulsion may have any uniform or non-uniform distribution.
  • any of the emulsions disclosed herein may be monodisperse (composed of droplets of at least generally uniform size), or may be polydisperse (composed of droplets of various sizes). If monodisperse, the droplets of the emulsion may vary in volume by a standard deviation that is less than about plus or minus 100%, 50%, 20%, 10%, 5%, 2%, or 1% of the average droplet volume. Droplets generated from an orifice may be monodisperse or polydisperse.
  • An emulsion may have any suitable composition. The emulsion may be characterized by the predominant liquid compound or type of liquid compound that is used. The predominant liquid compounds in the emulsion may be water and oil.
  • Oil is any liquid compound or mixture of liquid compounds that is immiscible with water and that has a high content of carbon.
  • oil also may have a high content of hydrogen, fluorine, silicon, oxygen, or any combination thereof, among others.
  • any of the emulsions disclosed herein may be a water-in-oil (W/O) emulsion (i.e., aqueous droplets in a continuous oil phase).
  • W/O) emulsion i.e., aqueous droplets in a continuous oil phase.
  • the oil may be or include at least one silicone oil, mineral oil, fluorocarbon oil, vegetable oil, or a combination thereof, among others.
  • Any other suitable components may be present in any of the emulsion phases, such as at least one surfactant, reagent, sample (i.e., partitions thereof), buffer, salt, ionic element, other additive, label, particles, or any combination thereof.
  • Droplet refers to a small volume of liquid, typically with a spherical shape or as a slug that fills the diameter of a microchannel, encapsulated by an immiscible fluid.
  • the volume of a droplet, and/or the average volume of droplets in an emulsion may be less than about one microliter (i.e., a “microdroplet”) (or between about one microliter and one nanoliter or between about one microliter and one picoliter), less than about one nanoliter (or between about one nanoliter and one picoliter), or less than about one picoliter (or between about one picoliter and one femtoliter), among others.
  • a droplet may have a diameter (or an average diameter) of less than about 1000, 100, or 10 micrometers, or of about 1000 to 10 micrometers, among others.
  • a droplet may be spherical or nonspherical. In some embodiments, the droplet has a volume and diameter that is large enough to encapsulate a cell.
  • barcode refers to a nucleic acid sequence that is used to identify a single cell or a subpopulation of cells.
  • a barcode sequence is used to identify a particular organism or a species.
  • barcode sequences can be introduced into a cell, linked by various amplification methods to a target nucleic acid of interest, and used to trace back the amplicon to the cell.
  • Barcode sequences can be flanked by universal sequences that can be used to amplify libraries of barcodes using universal primer pairs.
  • the barcode sequences can be contained within a circular or linear double-stranded molecule, or in a single-stranded linear molecule.
  • bulk sequencing or “next generation sequencing” or “massively parallel sequencing” refers to any high throughput sequencing technology that parallelizes the DNA sequencing process. For example, bulk sequencing methods are typically capable of producing more than one million polynucleic acid amplicons in a single assay.
  • bulk sequencing “massively parallel sequencing,” and “next generation sequencing” refer only to general methods, not necessarily to the acquisition of greater than 1 million sequence tags in a single run.
  • Any bulk sequencing method can be implemented in the invention, such as reversible terminator chemistry (e.g., Illumina), pyrosequencing using polony emulsion droplets (e.g., Roche), ion semiconductor sequencing (IonTorrent), single molecule sequencing (e.g., Pacific Biosciences), massively parallel signature sequencing, etc.
  • reversible terminator chemistry e.g., Illumina
  • pyrosequencing using polony emulsion droplets e.g., Roche
  • IonTorrent ion semiconductor sequencing
  • single molecule sequencing e.g., Pacific Biosciences
  • massively parallel signature sequencing etc.
  • in situ refers to examining a biological phenomenon in the environment in which it occurs e.g. the practice of in situ hybridization refers to hybridization of a probe to a nucleic acid target with the cell still intact.
  • 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.
  • T cell refers to a type of cell that plays a central role in cell-mediated immune response.
  • T cells belong to a group of white blood cells known as lymphocytes and can be distinguished from other lymphocytes, such as B cells and natural killer T (NKT) cells by the presence of a T cell receptor (TCR) on the cell surface.
  • T cells responses are antigen-specific and are activated by foreign antigens.
  • T cells are activated to proliferate and differentiate into effector cells when the foreign antigen is displayed on the surface of the antigen-presenting cells in peripheral lymphoid organs.
  • T cells recognize fragments of protein antigens that have been partly degraded inside the antigen-presenting cell.
  • B cell refers to a type of lymphocyte that plays a large role in the humoral immune response (as opposed to the cell-mediated immune response, which is governed by T cells).
  • the principal functions of B cells are to make antibodies against antigens, perform the role of antigen-presenting cells (APCs) and eventually develop into memory B cells after activation by antigen interaction.
  • APCs antigen-presenting cells
  • B cells are an essential component of the adaptive immune system.
  • a microfluidic device is used to generate single cell emulsion droplets.
  • the microfluidic device ejects single cells in aqueous reaction buffer into a hydrophobic oil mixture.
  • the device can create thousands of emulsion microdroplets per minute. After the emulsion microdroplets are created, the device ejects the emulsion mixture into a trough.
  • the mixture can be pipetted or collected into a standard reaction tube for thermocycling.
  • Custom microfluidics devices for single-cell analysis are routinely manufactured in academic and commercial laboratories (Kintses et al., 2010 Current Opinion in Chemical Biology 14:548-555).
  • chips may be fabricated from polydimethylsiloxane (PDMS), plastic, glass, or quartz.
  • PDMS polydimethylsiloxane
  • fluid moves through the chips through the action of a pressure or syringe pump.
  • Single cells can even be manipulated on programmable microfluidic chips using a custom dielectrophoresis device (Hunt et al., 2008 Lab Chip 8:81-87).
  • a pressure-based PDMS chip comprised of flow-focusing geometry manufactured with soft lithographic technology is used (Dolomite Microfluidics (Royston, UK)) (Anna et al., 2003 Applied Physics Letters 82:364-366).
  • the stock design can typically generate 10,000 aqueous-in-oil microdroplets per second at size ranges from 10-150 ⁇ m in diameter.
  • the hydrophobic phase will consist of fluorinated oil containing an ammonium salt of carboxy-perfluoropolyether, which ensures optimal conditions for molecular biology and decreases the probability of droplet coalescence (Johnston et al., 1996 Science 271:624-626).
  • images are recorded at 50,000 frames per second using standard techniques, such as a Phantom V7 camera or Fastec InLine (Abate et al., 2009 Lab Chip 9:2628-31).
  • the microfluidic system can optimize microdroplet size, input cell density, chip design, and cell loading parameters such that greater than 98% of droplets contain a single cell.
  • the metrics for success include: (i) encapsulation rate (i.e., the number of drops containing exactly one cell); (ii) the yield (i.e., the fraction of the original cell population ending up in a drop containing exactly one cell); (iii) the multi-hit rate (i.e., the fraction of drops containing more than one cell); (iv) the negative rate (i.e., the fraction of drops containing no cells); and (v) encapsulation rate per second (i.e., the number of droplets containing single cells formed per second).
  • single cell emulsions are generated by extreme cell dilution.
  • the probability that a microdroplet will contain k cells is given by the Poisson distribution:
  • a simple microfluidic chip with a drop-making junction is used, such that an aqueous stream flows through a 10 ⁇ m square nozzle and dispenses the aqueous-in-oil emulsion mixtures into a reservoir.
  • the emulsion mixture can then be pipetted from the reservoir and thermocycled in standard reaction tubes. This method will produce predictably high encapsulation rates and low multi-hit rates, but a low encapsulation rate per second.
  • a design that can achieve filled droplet throughput of 1000 Hz is capable of sorting up to 10 6 cells in less than 17 minutes.
  • Fluorescence techniques can also be used to sort microdroplets with particular emission characteristics (Baroud et al., 2007 Lab Chip 7:1029-1033; Kintses et al., 2010 Current Opinion in Chemical Biology 14:548-555). In these studies, chemical methods are used to stain cells. In some embodiments, autofluorescence is used to select microemulsions that contain cells. A fluorescent detector reduces the negative rate resulting from extreme cell dilution. A microfluidic device can also be equipped with a laser directed at a “Y” sorting junction downstream of the cell encapsulation junction. The Y junction has a “keep” and a “waste” channel. A photomultiplier tube is used to collect the fluorescence of each drop as it passes the laser.
  • the voltage difference is calibrated between empty drops and drops with at least one cell.
  • the device detects a droplet that contains at least one cell, and electrodes at the Y sorting junction create a field gradient by dielectrophoresis (Hunt et al., 2008 Lab on a Chip 8:81-87) and push droplets containing cells in to the keep channel.
  • the microfluidic device uses extreme cell dilution to control the multi-hit rate and fluorescent cell sorting to reduce the negative rate.
  • input cell flow is aligned with droplet formation periodicity, such that greater than 98% of droplets contain a single cell (Edd et al., 2008 Lab Chip 8:1262-1264; Abate et al., 2009 Lab Chip 9:2628-31).
  • a high-density suspension of cells is forced through a high aspect-ratio channel, such that the cell diameter is a large fraction of the channel's width.
  • the chip is designed with a 27 ⁇ m ⁇ 52 ⁇ m rectangular microchannel that flows cells into microdroplets at >104/min (Edd et al., 2008 Lab Chip 8:1262-1264). A number of input channel widths and flow rates are tested to arrive at an optimal solution.
  • cells with different morphology might behave differently in the microchannel stream of the microfluidic device, confounding optimization of the technique when applied to clinical biological samples.
  • a field gradient perpendicular to the microchannel by dielectrophoresis is induced. Dielectrophoresis pulls the cells to one side of the microchannel, creating in-channel ordering that is independent of cell morphology.
  • This method requires substantial optimization of charge and flow rate and a more complicated chip and device design, so this method may be necessary if existing methodologies fail to perform for certain cell types.
  • the emulsion microdroplet mixtures are pipetted from the trough in the microfluidic device to a reaction tube for thermocycling.
  • a number of methods might achieve emulsion reversal to recover the aqueous phase of the reaction.
  • Two straightforward reversal processes that have been used by prior investigators are flash-freezing in liquid nitrogen for 10 seconds (Kliss et al., 2008 Analytical Chem 80:8975-8981) and passage through a 15 ⁇ m mesh filter (Zeng et al., 2010 Analytical Chem 82: 3183-90).
  • Emulsion reversal can also be achieved using commercially available reagents designed for this purpose (Brouzes et al., 2009 PNAS 106:14195-200). Success of the emulsion reversal is assessed by visualization of the aqueous and hydrophobic phases under a microscope.
  • the methods of the invention use single cells in reaction containers, rather than emulsion droplets.
  • reaction containers include 96 well plates, 0.2 mL tubes, 0.5 mL tubes, 1.5 mL tubes, 384-well plates, 1536-well plates, etc.
  • PCR is used to amplify many kinds of sequences, including but not limited to SNPs, short tandem repeats (STRs), variable protein domains, methylated regions, and intergenic regions.
  • Methods for overlap extension PCR are used to create fusion amplicon products of several independent genomic loci in a single tube reaction (Johnson et al., 2005 Genome Research 15:1315-24; U.S. Pat. No. 7,749,697).
  • At least two nucleic acid target sequences are chosen in the cell and designated as target loci.
  • Forward and backward primers are designed for each of the two nucleic acid target sequences, and the primers are used to amplify the target sequences.
  • “Minor” amplicons are generated by amplifying the two nucleic acid target sequences separately, and then fused by amplification to create a fusion amplicon, also known as a “major” amplicon.
  • a “minor” amplicon is a nucleic acid sequence amplified from a target genomic loci
  • a “major” amplicon is a fusion complex generated from sequences amplified between multiple genomic loci.
  • Exemplary primers that can be used for generating minor and major amplicons are listed in Table 2. These primers are used for multiplexed amplification of a single cell's TCR ⁇ and then linkage of the TCR ⁇ to immune effector targets IL-2, IL-4, INFG, TBX21, FOXP3, or TNF ⁇ .
  • SEQ ID NOs: 1-57 are pooled together with primers for a single immune effector target, e.g., SEQ ID NOs: 68 and 69.
  • the method uses “inner” primers (i.e., the reverse primer for the first locus and the forward primer for the second locus) comprising of one domain that hybridizes with a minor amplicon and a second domain that hybridizes with a second minor amplicon.
  • “Inner” primers are a limiting reagent, such that during the exponential phase of PCR, inner primers are exhausted, driving overlapping domains in the minor amplicons to anneal and create major amplicons.
  • PCR primers are designed against targets of interest using standard parameters, i.e., melting temperature (Tm) of approximately 55-65° C., and with a length 20-50 nucleotides.
  • Tm melting temperature
  • the primers are used with standard PCR conditions, for example, 1 mM Tris-HCl pH 8.3, 5 mM potassium chloride, 0.15 mM magnesium chloride, 0.2-2 ⁇ M primers, 200 ⁇ M dNTPs, and a thermostable DNA polymerase.
  • Many commercial kits are available to perform PCR, such as Platinum Taq (Life Technologies), Amplitaq Gold (Life Technologies), Titanium Taq (Clontech), Phusion polymerase (Finnzymes), HotStartTaq Plus (Qiagen). Any standard thermostable DNA polymerase can be used for this step, such as Taq polymerase or the Stoffel fragment.
  • a set of nucleic acid probes are used to amplify a first target nucleic acid sequence and a second target nucleic acid sequence to form a fusion complex.
  • the first probe includes a sequence that is complementary to a first target nucleic acid sequence (e.g., the 5′ end of the first target nucleic acid sequence).
  • the second probe includes a sequence that is complementary to the first target nucleic acid sequence (e.g., the 3′ end of the first target nucleic acid sequence) and a second sequence that is complementary to an exogenous sequence.
  • the exogenous sequence is a non-human nucleic acid sequence and is not complementary to either of the target nucleic acid sequences.
  • the first and second probes are the forward primer and reverse primer for the first target nucleic acid sequence.
  • the third probe includes a sequence that is complementary to the portion of the second probe that is complementary to the exogenous sequence and a sequence that is complementary to the second target nucleic acid sequence (e.g., the 5′ end of the second target nucleic acid sequence).
  • the fourth probe includes a sequence that is complementary to the second target nucleic acid sequence (e.g., the 3′ end of the second target nucleic acid sequence).
  • the third probe and the fourth probe are the forward and reverse primers for the second target nucleic acid sequence.
  • the second and third probes are also called the “inner” primers of the reaction (i.e., the reverse primer for the first locus and the forward primer for the second locus) and are limiting in concentration, (e.g., 0.01 ⁇ M for the inner primers and 0.1 ⁇ M for all other primers). This will drive amplification of the major amplicon preferentially over the minor amplicons.
  • the first and fourth probes are called the “outer” primers.
  • the first and second nucleic acid sequences are amplified independently, such that the first nucleic acid sequence is amplified using the first probe and the second probe, and the second nucleic acid sequence is amplified using the third probe and the fourth probe.
  • a fusion complex is generated by hybridizing the complementary sequence regions of the amplified first and second nucleic acid sequences and amplifying the hybridized sequences using the first and fourth probes. This is called overlap extension PCR amplification.
  • the complementary sequence regions of the amplified first and second nucleic acid sequences act as primers for extension on both strands and in each direction by DNA polymerase molecules.
  • the outer primers prime the full fused sequence such that the fused complex is duplicated by DNA polymerase. This method produces a plurality of fusion complexes.
  • FIGS. 5-6 show an example of the single cell sequence linkage by intracellular overlap extension polymerase chain reaction, according to one embodiment of the invention.
  • a forward primer targets one locus of a first target nucleic acid (g).
  • a reverse primer targets another locus of the first target nucleic acid (g) and has a region of complementarity (c) to a region (d) of the forward primer (e).
  • the forward primer (e) has a region of complementarity to the second target nucleic acid (h) and the reverse primer (f) targets another region of the second target nucleic acid (h).
  • FIG. 5A a forward primer (a) targets one locus of a first target nucleic acid (g).
  • a reverse primer targets another locus of the first target nucleic acid (g) and has a region of complementarity (c) to a region (d) of the forward primer (e).
  • the forward primer (e) has a region of complementarity to the second target nucleic acid (h) and the
  • FIG. 5B illustrates an example of the hybridization of the probes (a, b, e and f) to respective target nucleic acids (g and h), according to one embodiment of the invention.
  • FIG. 6A illustrates an example of the complementary regions (c) and (d) between amplicons (g) and (h), according to one embodiment of the invention.
  • FIG. 6B shows linkage amplification of the amplicons (g) and (h) using polymerase (e) to create a linked major amplicon (i).
  • the end product is a library of “major amplicons” that include the linked amplicons (g) and (h), which can be sequenced in bulk.
  • the steps of FIGS. 5-6 can be performed in a reaction container or an emulsion droplet.
  • multiple loci are targeted in a single cell, and many sets of probes can be multiplexed into a single analysis, such that several loci or even the entire transcriptome or genome is analyzed.
  • Multiplex PCR is a modification of PCR that uses multiple primer sets within a single PCR mixture to produce amplicons of varying sizes that are specific to different DNA sequences. By targeting multiple genes at once, additional information may be gained from a single test run that otherwise would require several times the reagents and more time to perform.
  • 10-20 different transcripts are targeted in a single cell and linked to a second target nucleic acid (e.g., linked to a variable region such as a mutated gene sequence, a barcode, or an immune variable region).
  • single cells are encapsulated in aqueous-in-oil picoliter microdroplets.
  • the droplets enable compartmentalization of reactions such that molecular biology can be performed on millions of single cells in parallel.
  • Monodisperse aqueous-in-oil microdroplets can be generated on microfluidic devices at size ranges from 10-150 ⁇ m in diameter.
  • droplets can be generated by vortexing or by a TissueLyser (Qiagen).
  • Two embodiments of oil and aqueous solutions for creating PCR microdroplets are: (i) PCR buffer that contains 0.5 ⁇ g/ ⁇ L bovine serum albumin (New England Biolabs) combined with mixture of fluorocarbon oil (3M), Krytox 157FSH surfactant (Dupont), and PicoSurf (Sphere Microfluidics); and (ii) PCR buffer with 0.1% Tween 20 (Sigma) combined with a mixture of light mineral oil (Sigma), EM90 (Evonik), and Triton X-100 (Sigma).
  • PCR can occur in a standard thermocycling tube, a 96-well plate, or a 384-well plate, using a standard thermocycler (Life Technologies). PCR can also occur in heated microfluidic chips, or any other kind of container that can hold the emulsion and transfer heat.
  • the amplified material After thermocycling and PCR, the amplified material must be recovered from the emulsion.
  • ether is used to break the emulsion, and then the ether is evaporated from the aqueous/ether layer to recover the amplified DNA in solution.
  • Other methods include adding a surfactant to the emulsion, flash-freezing with liquid nitrogen, and centrifugation.
  • the major amplicon is isolated from the minor amplicons using gel electrophoresis. If yield is not sufficient, the major amplicon is amplified again using PCR and the two outer primers. This material can then be sequenced directly using bulk sequencing. In some embodiments, the outer primers are used to produce molecules than can be sequenced directly. In other embodiments, adapters must be added to the major amplicon before bulk sequencing. Once the sequencing library is synthesized, bulk sequencing can be performed using standard methods and without significant modification.
  • the overlap extension PCR method adapts to single tube overlap extension RT-PCR, which amplifies DNA from RNA transcripts.
  • the RT-PCR method combines cDNA synthesis and PCR in enclosed tubes without buffer exchange or reagent addition between the molecular steps.
  • Thermostable reverse transcriptase (RT) enzymes are used that withstand temperatures greater than 95° C., though thermostable RT is not necessary if first strand cDNA synthesis occurs prior to PCR amplification.
  • RT reverse transcriptase
  • both ThermoScript RT (Lucigen) and GeneAmp Thermostable rTth are designed and used in single-tube reverse transcriptase PCR.
  • a set of nucleic acid probes are used to amplify a first target nucleic acid sequence and a second target nucleic acid sequence to form a fusion complex.
  • the first target nucleic acid sequence or the second target nucleic acid sequence is RNA.
  • the first probe includes a sequence that is complementary to a first target nucleic acid sequence (e.g., the 5′ end of the first target nucleic acid sequence).
  • the second probe includes a sequence that is complementary to the first target nucleic acid sequence (e.g., the 3′ end of the first target nucleic acid sequence) and a second sequence that is complementary to an exogenous sequence.
  • the exogenous sequence is a non-human nucleic acid sequence and is not complementary to either of the target nucleic acid sequences.
  • the first and second probes are the forward primer and reverse primer for the first target nucleic acid sequence.
  • the third probe includes a sequence that is complementary to the portion of the second probe that is complementary to the exogenous sequence and a sequence that is complementary to the second target nucleic acid sequence (e.g., the 5′ end of the second target nucleic acid sequence).
  • the fourth probe includes a sequence that is complementary to the second target nucleic acid sequence (e.g., the 3′ end of the second target nucleic acid sequence).
  • the third probe and the fourth probe are the forward and reverse primers for the second target nucleic acid sequence.
  • the second and third probes are also called the “inner” primers of the reaction (i.e., the reverse primer for the first locus and the forward primer for the second locus) and are limiting in concentration, (e.g., 0.01 ⁇ M for the inner primers and 0.1 ⁇ M for all other primers). This will drive amplification of the major amplicon preferentially over the minor amplicons.
  • the first and fourth probes are called the “outer” primers.
  • the method includes amplifying using RT-PCR the first and second nucleic acid sequences independently, such that the first nucleic acid sequence is amplified using the first probe and the second probe, and the second nucleic acid sequence is amplified using the third probe and the fourth probe.
  • a fusion complex is generated by hybridizing the complementary sequence regions of the amplified first and second nucleic acid sequences and amplifying the hybridized sequences using the first and fourth probes. (See FIGS. 5-6 ).
  • Ligase chain reaction is used to target and amplify genetic loci of interest (Landegren et al., 1988 Science 241:1077-1080; Benjamin et al., 2003 Methods in Molecular Biology 226: 135-149; U.S. Pat. No. 6,235,472).
  • ligase chain reaction two polynucleic acid probes target a polynucleic acid locus of interest. Upon hybridization, the two probes are ligated by a ligase enzyme.
  • LCR amplifies both RNA and DNA, facilitating many different kinds of multiplexed analysis.
  • Another notable advantage of ligase chain reaction is the capacity for allele-specific amplification. Whereas PCR amplifies both alleles for a particular variant, the ligation process of LCR is allele-specific.
  • LCR probes are used as a molecular “switch.” For example, if millions of single cells are screened for a particular variant, only cells that include that variant will produce major amplicons. LCR is used to perform genetic analysis only on cells that contain a particular sequence of interest. Cells that lack the sequence of interest are not substantially amplified and are therefore silent in the reaction. LCR can also be multiplexed more efficiently than PCR, using hundreds of probes targeting hundreds of genetic loci in a single cell microdroplet or intracellular reaction.
  • a single tube-single buffer overlap extension LCR/PCR reaction mixture is formulated using DNA and/or RNA, LCR probes, the PCR primers, Ampligase (Epicentre), a DNA polymerase such as Stoffel fragment (Life Technologies), and reaction buffer (20 mM Tris-HCl, 25 mM KCl, 10 mM MgCl 2 , 0.5 mM NAD, 0.01% Triton X-100).
  • the method combines LCR with overlap extension PCR to leverage the benefits of both LCR and PCR ( FIGS. 7-9 ).
  • the “inner” probes are added at 1/10 th of the concentration of the other oligonucleotides in the reaction such that they become a limiting reagent at later cycles.
  • the mixtures can be incubated for 4 minutes at 20° C., 5 minutes at 95° C., and 15 minutes at 60° C.
  • Standard PCR thermocycling conditions are used to amplify the minor and major amplicons (95° C., 5 minutes; [95° C., 30 seconds; 60° C., 30 seconds; 72° C., 30 seconds] ⁇ 30 cycles).
  • the major amplicon is amplified further by gel size selection and another round of amplification using the outer primers only.
  • a forward LCR primer targets one locus of a first target nucleic acid (g).
  • a reverse LCR primer targets another locus of the first target nucleic acid (g) and has a region of complementarity (c) to a region (d) of the forward primer (e).
  • the forward LCR primer (e) has a region of complementarity to the second target nucleic acid (h) and the reverse LCR primer (f) targets another region of the second target nucleic acid (h).
  • FIG. 8A shows another example of the complementary regions between amplicons (a) and (d), according to one embodiment of the invention.
  • FIG. 8B shows linkage amplification of the amplicons using polymerase (e) to create a linked major amplicon.
  • the steps of FIGS. 7 and 8 can be performed in a reaction container or an emulsion droplet.
  • FIG. 9A shows an example of a linked amplicon (f), according to one embodiment of the invention.
  • FIG. 9B shows the resulting amplicon produced from the steps shown in FIGS. 8A and 8B .
  • the end product can be a library of “major amplicons” and are sequenced in bulk.
  • the single cell sequence linkage by intracellular ligase chain reaction combined with overlap extension polymerase chain reaction is performed with the following set of probes: a first LCR probe comprising a sequence that is complementary to a first target nucleic acid subsequence, a second probe comprising a sequence that is complementary to a second subsequence of the first target nucleic acid and a second sequence that is complementary to an exogenous sequence, a third probe comprising the exogenous sequence and a sequence that is complementary to a first subsequence of a second target nucleic acid, and a fourth probe comprising a sequence that is complementary to a second subsequence of the second target nucleic acid sequence.
  • the method includes isolating the single cells with at least one set of nucleic acid probes.
  • the first and second probes are hybridized to the first nucleic acid and ligated by a ligase enzyme.
  • the third and fourth probes are hybridized to the second target nucleic acid and ligated by a ligase enzyme.
  • the ligated probes for the first and second target nucleic acids are hybridized across the complementary region comprising the exogenous sequence and overlap extension PCR is used to generating a fused complex.
  • the fused complexes can be bulk sequenced.
  • a padlock probe is a circularized, single stranded DNA or RNA molecule with complementarity to a sequence target of interest (Hardenbol et al., 2003 Nature Biotechnology 21:673-678; U.S. Pat. No. 6,858,412).
  • a polymerase fills the gap between the two ends of the probe, and a ligase completes the polynucleotide chain to form a circularized polynucleotide molecule.
  • the circularized molecule can then be amplified with multiple displacement amplification (MDA).
  • MDA multiple displacement amplification
  • MDA is an isothermal amplification method that functions by annealing single stranded polynucleotides to the template, followed by DNA synthesis by a high fidelity enzyme such as ⁇ -29 polymerase.
  • Inverse PCR can also be used to amplify only the circularized molecules because PCR primers that amplify the circularized molecules will not amplify the single stranded probes (U.S. Pat. No. 6,858,412).
  • padlock probes over PCR is the capacity for allele-specific amplification. Whereas PCR amplifies both alleles for a particular variant, the ligation process of padlock probes is allele-specific. As with LCR, padlock probes are used as a molecular “switch.” If millions of single cells are screened for a particular variant, only cells that include that variant will produce major amplicons. Thus, padlock probes are used to perform genetic analysis only on cells that contain a particular sequence of interest. Also, in certain embodiments, padlock probes are highly multiplexed, with tens of thousands of probe types targeting tens of thousands of genetic loci in a single cell microdroplet or intracellular reaction (See U.S. Pat. No. 6,858,412).
  • Padlock probes are typically hybridized to targets by cycling at least 20 times between 95° C. for 5 min and 55° C. for 20 min (Baner et al., 2003 Nucleic Acids Research 31: e103). The single nucleotide gaps are then filled with Stoffel polymerase and ligase, such as Tth ligase or Ampligase (Epicentre). The circularized probes are then be amplified using PCR with universal primers. When multiplexed for overlap extension PCR, two sets of universal primers are used, one for each padlock probe type. The universal primers contain sequence regions of overlap, which enables standard overlap extension PCR following initial sequence capture by the padlock probes. (See FIGS. 10-14 ). The probes can also be engineered to contain the appropriate primer sequences for bulk sequencing, so the library is sequenced directly after PCR amplification.
  • FIG. 10 illustrates an example of the components required for a single cell sequence linkage by padlock probes combined with overlap extension polymerase chain reaction, according to one embodiment of the invention.
  • FIG. 11 shows the complementary regions between a first padlock probe (a) and the first target nucleic acid (c) and between a second padlock probe (b) and a second target nucleic acid (d) in a single cell, according to one embodiment of the invention.
  • the reaction components can be contained in a physical reaction container or an emulsion droplet (k).
  • the first padlock probe (a) includes two separate regions that are complementary to the first target nucleic acid (c).
  • the second padlock probe (b) includes two separate regions that are complementary to a second target nucleic acid (d).
  • a polymerase and a ligase are used (m) to amplify and ligate the gap between complementary regions of the padlock probes (a) and (b).
  • FIG. 12 illustrates the resulting circularized amplicons (g) and (h) and the primers that are used to amplify the circularized amplicons, according to one embodiment of the invention.
  • a forward primer (a) and a reverse primer (i) are used to amplify circular amplicon (g).
  • Forward and reverse primers (j) and (f) are used to amplify circular amplicon (h).
  • Primer (i) has a region (b) that is complementary to a region of amplicon (g) and a region (c) that is complementary to region (d) of primer (j).
  • Primer (j) has a region (e) that is complementary to the amplicon (h) and a region (d) that is complementary to region (c) of primer (i).
  • FIG. 13 is an example of the resulting amplicons from amplification of the circular probes (g) and (h), according to one embodiment of the invention.
  • region (a) is complementary to amplicon (g) and region (b) is complementary to region (c).
  • Region (d) is complementary to amplicon (h) and region (c) is complementary to region (b).
  • FIG. 14 is an example of overlap extension PCR amplification of the amplicons using a polymerase (e), according to one embodiment of the invention.
  • the resulting amplicon (f) includes sequences (a), (d), and the overlapping sequences (b) and (c).
  • the resulting amplicon (f) can be used for bulk sequencing. The steps can be performed in a reaction container or an emulsion droplet (g).
  • multiprobe circularization can be used.
  • two padlock probes target two genetic loci.
  • a polymerase fills the gap between the ends of the two probes, and a ligase completes the polynucleotide chains to form a circularized polynucleotide molecule.
  • MDA multiple displacement amplification
  • Inverse PCR can also be used to amplify only the circularized molecules, because PCR primers that amplify the circularized molecules will not amplify the single stranded probes (See FIGS. 2-3 ).
  • the probes are hybridized to targets by cycling at least 20 times between 95° C. for 5 min and 55° C. for 20 min (Baner et al., 2003 Nucleic Acids Research 31: e103).
  • the single nucleotide gaps are filled with a Stoffel polymerase and ligase.
  • the circularized probes are amplified using PCR with universal primers. When multiplexed for overlap extension PCR, the two sets of universal primers are used, one for each padlock probe type.
  • the universal primers contain sequence regions of overlap, which enables standard overlap extension PCR following initial sequence capture by the padlock probes ( FIGS. 2-3 ).
  • the probes can also be engineered to contain the appropriate primer sequences for bulk sequencing, so the library is sequenced directly after PCR amplification.
  • FIG. 1 shows an example of sequence linkage in a single cell by intra-cellular multiprobe circularization of a molecular complex, according to one embodiment of the invention.
  • Each probe has a region of complementarity to each of the target loci.
  • the complex includes two nucleic acid probes (a and b) and two target nucleic acids (c and d).
  • the single cell (e) can be contained in a reaction container or an emulsion droplet (j).
  • FIG. 1A illustrates that the nucleic acid probe (a) has a first region (f) that is complementary to a region on the target nucleic acid (c), and a second region (g) that is complementary to a region on the target nucleic acid (d).
  • the nucleic acid probe (b) has a first region (h) that is complementary to a region on the target nucleic acid (c) and a second region (i) that is complementary to a region on the target nucleic acid (d).
  • FIG. 1B illustrates an example of sequence linkage in a single cell (also in a reaction container or emulsion droplet (j)) by intra-cellular multiprobe circularization of a complex, according to one embodiment of the invention.
  • the two nucleic acid probes (a and b) are hybridized to the complementary regions of the two target nucleic acids (c and d).
  • FIG. 1C illustrates an example of circularization of a probe-target linkage complex occurs by amplification, according to one embodiment of the invention.
  • a ⁇ -29 polymerase mediated rolling circle amplification is used to circularize the end regions (f) of the two nucleic acid probes (a) and (b).
  • FIG. 2 shows an example of amplification of a circularized probe-target linkage complex (a) using a polymerase (b), according to one embodiment of the invention.
  • a ⁇ -29 polymerase is used in a mediated rolling circle amplification, and copies (b and c) of the circularized probe-target complex are generated.
  • FIG. 3 illustrates an example of amplification of a circularized probe-target linkage complex (a) using a polymerase (b) and primers (c and d), according to one embodiment of the invention.
  • the primers (c and d) are used to amplify the region of the circularized probe-target complex that is complementary to the target nucleic acid. Multiple copies (e) of a linear double-stranded polynucleic acid amplicon are generated and sequenced in bulk.
  • RNA sequencing requires destruction of cells or emulsion microdroplets, such that all polynucleic acid analytes are pooled into a single reaction mixture. Trace back of a particular sequence target from bulk sequencing data to a particular cell is typically not possible. However, many applications will require trace back of sequences to their original single cells. For example, an investigator may wish to analyze a cell population for single cell expression patterns for two RNA transcripts. Overlap extension reverse transcriptase PCR amplification of two RNA transcript targets followed by bulk sequencing is not adequate for such an analysis because all of the transcripts are mixed together, and transcripts from high-expressing cells are indistinguishable from transcripts from low-expressing cells. To address this problem, polynucleic acid barcodes are used.
  • Each single cell emulsion microdroplet or physical reaction container contains a single unique clonal polynucleic acid barcode. This barcode is then linked to the target polynucleic acids (i.e., RNA transcripts), and is used to trace back the major amplicons to a single cell (See FIGS. 18-25 ). With trace back of each sequence to an original single cell, it is possible to tabulate genetic data for each single cell, which then enables single cell quantification (i.e., single cell gene expression levels).
  • target polynucleic acids i.e., RNA transcripts
  • the linker barcode oligonucleotide is highly diluted, such that less than 1% of picoliter emulsion microdroplets carry more than one linker barcode. This enables the linking of a single cell to a single barcode.
  • the linker barcode oligonucleotide is amplified by PCR using universally primers inside each droplet, such that each droplet will contain millions of copies of only one linker barcode sequence, and that barcode will be unique to that droplet ( FIGS. 18-21 ).
  • the barcode is then physically linked to the target molecule by overlap extension PCR.
  • Barcodes can be produced by a number of methods.
  • a library of random decamers are subcloned into a plasmid vector (e.g., Life Technologies). This produces a mixed plasmid library with >1 million unique decamer barcodes. Then, the plasmids are transformed into bacteria and 3,840 clones are picked. The clones are sequenced by capillary sequencing (Sequetech) and archived in glycerol stocks on 384-well plates. Next, the clones are digested at restriction sites on either side of the random decamer inserts to produce a ⁇ 100 bp fragment. These fragments are then biotinylated using Klenow fragment with standard procedures.
  • the method provides beads attached to barcode nucleic acid sequences.
  • a library of random 15-mers is subcloned into a plasmid vector (Life Technologies). This produces a mixed plasmid library with >1 billion unique 15-mer barcodes.
  • the biotinylated fragments are then affixed to 17 ⁇ m diameter streptavidin beads (Life Technologies).
  • the plasmid barcode mixture is diluted in PCR mix such that 99% of the droplets that contain a plasmid will contain only a single clonal plasmid.
  • the PCR mix contains biotinylated nucleotides, such that amplified barcodes are biotinylated.
  • streptavidin beads are flowed into this PCR mix to encapsulate single beads in microdroplets. At least 10 million beads are typically encapsulated, and then the bead/plasmid mixes are thermocycled to amplify and biotinylate the barcodes. The barcoded beads are then recovered and can be used in the droplet barcoding method.
  • a microfluidic device injects beads coated with clonal linker barcode oligonucleotides into the single cell emulsion microdroplets.
  • a microfluidic device enables visualization of single beads and single cells in each drop, eliminating the requirement for highly dilute linker barcode oligonucleotides.
  • PCR is also used to amplify the linker barcode oligonucleotide, such that each droplet contains millions of copies of the same barcode sequence, but each barcode would be unique to a single microdroplet. The barcode is then linked to the target nucleic acid sequence using overlap extension PCR.
  • the complementary sequence regions of the amplified first and second nucleic acid sequences act as primers for extension on both strands in each direction by DNA polymerase molecules.
  • the outer primers prime the full fused sequence such that it is duplicated by DNA polymerase. This method produces a plurality of fusion complexes.
  • the method includes steps for providing a pool of unique barcode sequences, where each barcode sequence is linked to a selection resistance gene, providing a population of single cells, transfecting the population of single cells with the pool of unique barcode sequences, selecting cells comprising a unique barcode sequence and the selection resistance gene, and isolating each of the selected cells into reaction containers or emulsion microdroplets.
  • the selection resistance gene encodes resistance to gentamycin, neomycin, hygromycin, or puromycin. The selection resistance gene enables one to select cells that have incorporated the barcode sequence into the cell. Cells that lack the plasmid also lack the selection resistance gene and therefore are killed in the presence of a mammalian selection chemical such as gentamycin, neomycin, hygromycin, or puromycin.
  • FIG. 15 illustrates an example of plasmid library deconvolution by barcoded tailed end (5′-end barcoded) polymerase chain reaction, which is followed by bulk sequencing and informatics, according to one embodiment of the invention.
  • the barcode sequence can be traced back to a well and plate position, the barcode sequence can then be traced to a nucleic acid sequence, and the nucleic acid sequence is traced back to a well.
  • Each of the primers in (a) and (b) have a 5′-end barcoded tag.
  • the target nucleic acids in (c) and (d) are amplified using the primers in (a) and (b).
  • the steps can be performed in enclosed containers or emulsion droplets, as shown in (c) and (d).
  • FIG. 16 also shows an example of amplification (e, f) of two target nucleic acids (A and B) using primers that include barcode sequences, according to one embodiment of the invention.
  • the resulting amplicons that include the barcode sequences are shown in (g) and (h).
  • FIG. 17 illustrates a simplified example of tracing back a barcode sequence in an amplicon to a cell target (A or B), and tracing back the cell target to a physical location (c, d) (e.g., a well), according to one embodiment of the invention.
  • FIG. 18 illustrates the components for molecular linkage between two transcripts (g and h) and a molecular barcode sequence (k), according to one embodiment of the invention.
  • the targets (g and h) can be RNA transcripts, and the molecular barcode sequence (k) is flanked by universal priming sites. Only one copy of the molecular barcode oligonucleotide is contained in the emulsion droplet or reaction container (j), and universal PCR primers amplify the oligonucleotide to produce a plurality of clonal barcode polynucleic acids.
  • a forward primer (a) and reverse primer (m) are used to amplify target nucleic acid (g).
  • a forward primer (n) and reverse primer (f) are used to amplify target nucleic acid (h).
  • the reverse primer (m) includes a region (b) that is complementary to the target nucleic acid (g) and a region (c) that is complementary to region (d) on primer (n).
  • Primer (n) includes a region (e) of complementarity to target nucleic acid (h) and a region (d) of complementarity to region (c) of primer (m).
  • more than two targets can be linked, and the targets can also be DNA.
  • FIG. 19 shows an example of amplification of the target nucleic acids (g and h) using primers as shown, according to one embodiment of the invention.
  • the forward primer (a) is complementary to target nucleic acid (g)
  • the reverse primer (b) for the target nucleic acid (g) includes a region (c) that is complementary to the barcode sequence (k).
  • Forward primer (e) and reverse primer (f) are used to amplify target nucleic acid (h).
  • the forward primer (e) includes a region (d) that is complementary to the barcode sequence (k).
  • FIG. 20 amplicons resulting after amplification of two target nucleic acids and a barcode sequence (k) are shown, according to one embodiment of the invention.
  • FIG. 21 illustrates a fused amplicon that includes sequences of two target nucleic acids (g and h) and a barcode sequence (k) inside an emulsion droplet or reaction container (j), according to one embodiment of the invention.
  • the fused (“major”) amplicon can be isolated by reverse emulsion and bulk sequenced.
  • the targets (g and h) can be RNA transcripts, and the molecular barcode sequence (k) is flanked by universal priming sites.
  • Only one copy of the molecular barcode sequence (k) is contained in the single cell emulsion droplet or reaction container (j), and universal PCR primers amplify the oligonucleotide to produce a plurality of clonal barcode polynucleic acids.
  • Forward primer (a) and reverse primer (b) are used to amplify target nucleic acid (g).
  • Forward primer (n) and reverse primer (f) are used to amplify target nucleic acid (h).
  • the reverse primer (m) includes a region (b) that is complementary to the target nucleic acid (g) and a region (c) that is complementary to region (d) on primer (n).
  • Primer (n) includes a region (e) of complementarity to target nucleic acid (h) and a region (d) of complementarity to region (c) of primer (m).
  • more than two targets can be linked, and the targets can also be DNA.
  • FIG. 23 illustrates the forward and reverse primers that are used in a molecular linkage between two transcripts (g and h) and a molecular barcode sequence (k) attached to a bead (m), according to one embodiment of the invention.
  • Forward primer (a) and reverse primer (b) are used to amplify target nucleic acid (g).
  • Forward primer (n) and reverse primer (f) are used to amplify target nucleic acid (h).
  • the reverse primer (m) includes a region (b) that is complementary to the target nucleic acid (g) and a region (c) that is complementary to region (d) on primer (n).
  • Primer (n) includes a region (e) of complementarity to target nucleic acid (h) and a region (d) of complementarity to region (c) of primer (m).
  • the two target nucleic acids are complementary to a DNA sequence (l).
  • FIG. 24 is an example of amplicons resulting after amplification of two target nucleic acids and a barcode sequence (k) attached to a bead (m), according to one embodiment of the invention.
  • FIG. 25 illustrates a fused amplicon that includes sequences of two target nucleic acids (g and h) and a barcode sequence (k), inside an emulsion droplet or reaction container (j), according to one embodiment of the invention.
  • FIGS. 24-25 illustrate an example of amplicons resulting after amplification of two target nucleic acids and a barcode sequence (k) attached to a bead (m), according to one embodiment of the invention.
  • Targeting and amplification of genetic loci in cells can be performed using PCR, LCR, padlock probes, RT-PCR, or multi-probe circularization. Any combination of these methods to target and amplify different loci can be used.
  • a combination amplification approach is used to amplify a genomic DNA locus and an RNA transcript.
  • a thermostable reverse transcriptase enzyme such as ThermoScript RT (Lucigen) or GeneAmp Thermostable rTth (Life Technologies) is combined with a thermostable DNA polymerase, such as the Stoffel fragment or Taq DNA polymerase. Thermocycling can induce first strand cDNA synthesis from the RNA transcript target. Once cDNA from the RNA transcript is synthesized, overlap extension PCR is performed using the cDNA and the genomic DNA target sequences.
  • polynucleic acid sequencing There are a number of new commercial methodologies for polynucleic acid sequencing. These technologies are often referred to as “next generation sequencing,” “massively parallel sequencing,” or “bulk sequencing.” These terms are used interchangeably to describe any sequencing method that is capable of acquiring more than one million polynucleic acid sequence tags in a single run. Typically these methods function by making highly parallelized measurements, i.e., parallelized screening of millions of DNA clones on glass slides.
  • the methods for linking multiple polynucleic acid targets in single cells could be used in combination with any commercialized bulk sequencing method. These methods include reversible terminator chemistry (Illumina), pyrosequencing using polony emulsion droplets (Roche), single molecule sequencing (Pacific Biosciences), and others (IonTorrent, Halcyon, etc.).
  • the method provides the step of performing a bulk sequencing reaction to generate sequence information for at least 100,000 fused complexes from at least 10,000 cells within a population of cells.
  • the bulk sequencing reaction generates sequence information for at least 75,000, 50,000, or 25,000, or 10,000 fused complexes from at least 10,000 cells within a population of cells.
  • the fused complexes can then be used to quantify the particular biological or clinical phenomenon of interest.
  • particular clonotypes that express functional molecules can be analyzed by first determining the CDR3 peptide sequence of the fused complex, and then tabulating the instances of that CDR3 peptide linked to a particular effector molecule. In this way the bulk sequencing quantifies clonal expansion and biological function of each single clonotype.
  • primers targeting multiple effector molecules and all possible variable regions are multiplexed into a single assay, and one can separate clonotypes into functional compartments.
  • barcodes When primers targeting multiple transcripts are multiplexed into a single assay, one can use barcodes to infer multigenic expression patterns for single cells traced back to single droplets.
  • linkage between a mutant or variable sequence and other mutant or variable sequences one can analyze the bulk sequencing data to determine the sequence at each locus in each molecule in the bulk sequencing library, and then tabulate the instances of each sequence type. If, for example, a mutation in each of the two linked targets is required to produce a disease phenotype, quantifying the number of linked targets with two mutations can be used to detect disease in an individual.
  • the molecular methods described in section B above can be performed intracellularly in thousands to millions of single fixed cells (Embleton et al., 1992 Nucleic Acids Research 20:3831-37; Hviid, 2002 Clinical Chemistry 48:2115-2123; U.S. Pat. No. 5,830,663).
  • the cell membranes of the cells serve as reaction compartments, enabling linkage between two or more genetic loci in thousands to millions of single fixed cells analyzed in parallel.
  • Using fixed cells as reaction compartments is more cost-effective than a microfluidic chip to make emulsion microdroplets.
  • heterogeneity in cell size or morphology in a particular cell population is less likely to disrupt the fixed cell method than the emulsion microdroplet method.
  • fixed and permeabilized cells are encapsulated into microdroplets, and amplification occurs using fixed, permeabilized cells in microdroplets instead of lysed cells inside of microdroplets.
  • reagents such as glutaraldehye, paraformaldehyde, IntraStain (Dako), or similar reagents can be used.
  • reagents such as Triton X-100, Tween-20, IntraStain (Dako), or similar reagents can be used (Lippincott-Schwartz 2003 Short Protocols in Cell Biology ; Celis 2005 Cell Biology: A Laboratory Handbook ).
  • a buffer such as phosphate-buffered saline (PBS).
  • the fixed and permeabilized cells are soaked in reaction buffer and the first strand cDNA is intracellularly synthesized at 55-70° C. for four hours. Without washing or buffer exchange, one could then use standard overlap extension PCR thermocycling conditions to amplify and link the targets. After this amplification procedure, the mixture is washed several times with PBS, and the supernatant is retained for quality control analysis. The membranes of the resuspended cells are then disrupted using alkaline lysis buffer or proteinase K solutions (Johnson et al., 2010 Human Reproduction 25:1066-75).
  • the method herein provides for parallelized synthesis, deconvolution, and re-multiplexing of polynucleic acid libraries. The method retains the advantages of both parallelized synthesis and individual clone optimization. These polynucleic acid libraries are used for a variety of applications, including but not limited to, multiplexed amplification of target nucleic acid sequences for sequencing and analysis ( FIGS. 15-17 ).
  • a pool of thousands of padlock probes that target single nucleotide polymorphisms, or SNPs are generated.
  • DNA oligonucleotide probe precursors are synthesized in pools (Atactic or NimbleGen). Universal primers are then used to PCR amplify double-stranded DNA from the oligonucleotide pool (Porreca et al., 2007 Nature Methods 4:931-36).
  • the ends of the double-stranded PCR amplicon library are digested using a restriction enzyme. For example, EcoP15I is used, which cleaves 25 base pairs from the recognition site and removes the universal PCR binding sites.
  • EcoP15I is one example of an enzyme that is adequate for subcloning, and uncleaved products do not affect downstream molecular steps.
  • the digested library is subcloned into custom-engineered plasmid vectors that confer ampicillin resistance.
  • the plasmids are then transformed into bacterial cultures under selection with an antibiotic.
  • FIG. 4 illustrates an example of amplification of a circularized probe-target linkage complex (a) in a single cell (b), according to one embodiment of the invention.
  • Amplification occurs by transformation into bacteria and subsequent selection with antibiotics.
  • the amplicon (a) contains an antibiotic resistant gene and cells (c) that are transformed with the amplicon are selected in the presence of antibiotics. Cells without the circularized probe-target complex (d) are not selected.
  • a bacterial stock containing a mixed library of thousands of clones, each targeting a particular SNP is used for single stranded probe synthesis en masse.
  • the bacterial cultures are spread on LB agar plates under ampicillin selection, and then individual colonies are picked.
  • PCR with barcoded primers is used to amplify the probe sequence and flanking universal priming regions.
  • the result is an amplicon that contains both the probe sequence and a barcode that can be traced back to a single well.
  • a unique molecular barcode will indicate a particular well position in a particular 384-well plate.
  • the system could have 3,840 unique barcodes that indicate the well positions and plate number for 3,840 PCRs in one of ten 384-well plates.
  • 3,840 barcoded PCRs To deconvolute a 10,000-plex library of clones, four rounds of deconvolution are performed using the set of 3,840 barcoded PCRs, and oversampling and screening a total of 15,360 clones. For each round of deconvolution, the PCR products can then be pooled and sequenced using any bulk sequencing method.
  • a deconvolution algorithm can then be used to deconvolute the library. Because the barcode is matched to the insert sequence, a table is created that matches the barcode sequence to the original well and plate, and accordingly, this matches the insert sequence to a well.
  • the bacterial clones can then be stored as glycerol stocks, and sequences of these stocks can then be catalogued in a database and stored at ⁇ 80° C.
  • this method involves (i) digestion of a double stranded DNA with a restriction endonuclease; (ii) dephosphorylation of the “sticky end”; (iii) digestion of the second end of the double stranded DNA with a second restriction endonuclease; and (iv) digestion of the desphosphorylated strand of DNA using a ⁇ exonuclease.
  • the desired clones are picked, and then cultured in 384-well plates.
  • ssDNA single stranded DNA
  • the methods in Section II. A. can also be used to deconvolute mixed libraries of cells or organisms with different underlying genetic characteristics.
  • the goal is to separate the mixed library of clones into reaction compartments, perform barcoded PCR followed by bulk sequencing on the clones, and then map sequence data back to the clones in reaction compartments.
  • a population of mammalian cells is mutagenized and then clonal populations of mutagenized cells are isolated from the mixed population.
  • single mutagenized cells are sorted into reaction compartments, and then targeted barcoded PCR or padlock probes are performed at genetic loci of interest.
  • Bulk sequencing data is used to trace back to the original clones, and then the physical clone stocks is used for further investigation or use.
  • the immune system responds to disease by inducing cellular responses. Nearly all immunology is involved with detection of clonotype expansion or contraction in response to an antigen and/or functional analysis of the expanded or contracted clonotypes. Described in this example are methods that leverage the information contained in immune response to diagnose and treat disease. Active and/or memory cells are particularly informative because these cells indicate a functional immune response to a disease, and therefore have high information content. Variable DNA regions and RNA transcripts were analyzed in single cells from populations of activated and/or memory immune cells, and then correlated with disease. These profiles were used to develop noninvasive diagnostics, high-value diagnostics that inform treatment regimens, and novel therapeutic agents.
  • T cells include T cell receptors (TCR) that recognize antigens and control immune responses.
  • the T cell receptor is composed of two subunits: ⁇ and ⁇ or ⁇ and ⁇ .
  • Current methods to examine T cells by their T cell receptors overwhelmingly sequence T cell receptor subunits from bulk populations that range from a few to millions of cells. This results in a catalogue of subunit sequences ( ⁇ or ⁇ ) that are unlinked to the other corresponding subunit sequence found in individual cells ( ⁇ or ⁇ ). This gives population level information about T cell receptor diversity but does not give a description of individual T cell receptors in individual cells by both subunits ( ⁇ and ⁇ or ⁇ and ⁇ ).
  • the TCRs of individual cells in mixed populations are analyzed with finer resolution, and this allows an unprecedented mapping of human T-cell diversity.
  • TCR subunits and immune functionality molecules were linked using the methods described in Sections I. A-C.
  • This approach called “functional T cell sequencing,” focused specifically on T cells likely to have a clinically or biologically relevant function.
  • the immune function of a T cell is indicated by expression of both clonal TCR and signaling molecules such as interleukin-4 (IL-4).
  • IL-4 interleukin-4
  • Na ⁇ ve T cells express clonal TCR but do not express signaling molecules such as IL-4, and have different immune functions.
  • the TCR was linked to the signaling molecule, which in turn linked the TCR to clinical function.
  • Primers amplifying the full TCR ⁇ repertoire were linked to a single immune effector molecule, such as IL-4.
  • Primers amplifying the full TCR ⁇ repertoire were linked to dozens of immune effector molecules, resulting in a full T cell phenotype for each T cell clonotype in the assay.
  • Examples of molecules that are associated with immune function and that are linked to a TCR sequence include, but are not limited to: interleukin-2 (IL-2), interleukin-4 (IL-4), interferon gamma (IFN ⁇ ), interleukin-10 (IL-10), interleukin-1 (IL-1), interleukin-13 (IL-13), interleukin-17 (IL-17), interleukin-18 (IL-18), tumor necrosis factor alpha (TNF ⁇ ), tumor necrosis factor beta (TNF ⁇ ), T-box transcription factor 21 (TBX21), forkhead box P3 (FOXP3), cluster of differentiation 4 (CD4), cluster of differentiation 8 (CD8), cluster of differentiation 1d (CD 1d), cluster of differentiation 161 (CD 161), cluster of differentiation 3 (CD3), and T-box transcription factor TBX21 (T-BET).
  • IL-2 interleukin-2
  • IL-4 interleukin-4
  • IFN ⁇ interferon gamma
  • IFN ⁇ interleukin-10
  • the TCR ⁇ chain was linked to a molecule associated with immune function.
  • the TCR ⁇ and ⁇ , or TCR ⁇ and ⁇ , or any of the individual subunits were linked to immune functionality molecules.
  • Published primers optimized for amplification of recombined genomic TCR were used (Robins et al., 2009 Blood 114:4099-107).
  • Much of the peptide variability of the TCR was encoded in CDR3 ⁇ , which was formed by recombination between noncontiguous variable (V), diversity (D), and joining (J) segments in the b chain loci (Wang et al., 2010 PNAS 107:1518-23).
  • the CDR3 ⁇ region begins with the second conserved cysteine in the 3′ region of the V ⁇ segment and ends with the conserved phenylalanine encoded by the 5′ region of the J ⁇ segment (Monod et al., 2004 Bioinformatics 20:1379-i385).
  • amplified sequences were informatically translated to locate the conserved cysteine, obtain the intervening peptide sequence, and tabulate counts of each unique clone in the sample.
  • primers that can be used for multiplex amplification of TCR sequences and linkage to various immune effector molecules are shown in Table 2. These primers have been used, for example with the methods of Section I. A-C, to amplify and link TCR sequences to various immune effector molecules.
  • a high-throughput protocol was implemented for human or mouse TCR ⁇ repertoire library construction.
  • the libraries were sequenced directly on the GAIIx next-gen sequencing platform (Illumina).
  • Illumina next-gen sequencing platform
  • multiplex PCR was performed using a set of 20 primers to amplify across all 50 V segments and 10 primers to amplify across all 13 J segments.
  • the primers libraries generated libraries that were the reverse complement of the native TCR ⁇ sequence. This enabled sequencing from the J side of the constructs without further manipulation.
  • the primers also had tails with the same sequence as a portion of the Illumina TruSeq library adapter.
  • the 30 primers were pooled in a single 400 ⁇ l PCR, which contained genomic DNA from at least 5 ⁇ 10 5 cells.
  • the reactions were then thermocycled for no more than 25 cycles, depending on the number of input cells. After thermocycling, a PCR column (Qiagen) was used to remove the primers. Next, a second round of PCR was performed, using an aliquot of the purified first round analyte and a set of universal primers. The universal primers for the second round of PCR annealed to the tails of the first primers, producing final PCR products that had the full Illumina sequencing adapter sequence fused to a library of TCR ⁇ sequences. The universal primers also had barcode tags, which enabled multiplexing of dozens of samples in a single next-generation sequencing lane. Finally, the libraries were purified with gel size selection, and quantified with a quantitative PCR kit (Kapa Biosystems) prior to sequencing. Over 300 TCR ⁇ libraries were built and sequenced using this protocol.
  • FIG. 31 shows a simplified workflow for high-throughput generation of TCR ⁇ repertoire libraries.
  • the first round used a set of 30 primers to amplify the full TCR ⁇ repertoire and attaches universal priming regions.
  • the second round amplified the repertoire with universal primers and added sequences for next-generation sequencing.
  • a 48-plex pool of mouse TCR ⁇ plasmid clones was designed to act as template for protocol optimization.
  • multiplexed amplification was performed of the mouse TCR ⁇ repertoire as described in Example 2.
  • the PCR products were subcloned using the TOPO-TA vector (Life Technologies), transformed post ligation into TOP10 competent cells (Life Technologies), and 48 transformed colonies were picked.
  • the clones were sequenced by Sanger sequencing to identify the TCR ⁇ clonotype sequences. All of the clones were unique, and represented a broad range of possible V-J ⁇ combinations.
  • the plasmids were then mixed in a single tube, across three orders of magnitude and with six replicates at each concentration.
  • the 48-plex mixture was used to optimize the TCR ⁇ amplification protocol.
  • the purification methodology after the first and second PCR steps, the number of cycles in the first PCR, and the annealing temperature in the first PCR were optimized.
  • WA PCR column or gel excision for the purification technology were used. Due to spurious mispriming, the first round of PCR produced multiple bands in addition to a major band in the target size range of 150-200 bp. Gel excision removed the undesired material, but the process was tedious and results in loss of up to 75% of the desired material. Protocols with fewer first PCR amplification cycles typically produce less severe amplification bias, whereas amplification bias is typically skewed in protocols with >30 cycles. Annealing temperature controls the stringency of priming events, with lower temperatures producing higher yields but less specificity.
  • Illumina libraries were constructed using the mixture of 48 plasmids and varying protocol parameters as described above.
  • the libraries were sequenced on a next-generation sequencing machine (Illumina) to obtain >500 k paired-end 80 bp sequence tags for each library.
  • each 2 ⁇ 80 bp sequence tag was aligned to the sequences of the 48 known clonotypes to obtain the best match.
  • the number of tags aligned to each plasmid for each library was counted, and then these results were correlated with the expected ratios of the input plasmid clones.
  • a linear regression analysis to fit each data set was performed (see Table 1: yielding correlation, R 2 of 1, and a slope of 1.
  • the protocol used 15 cycles of amplification for the first PCR, an annealing temperature of 61° C., PCR column purification after the first PCR, and gel purification following the second PCR.
  • the CDR3 region must not contain any sequencing errors in the form of uncalled bases; and (ii) the CDR3 region is in frame as defined by the second conserved cysteine. If all quality tests are passed, the method identified the protein coding sequence of the CDR3 region within the known reading frame for that particular gene. This algorithm ensured speed, accuracy and lowest error rates. It can easily be adapted for use with other variable gene families, such as TCR ⁇ , or IgH.
  • Additional experiments are performed to build a library of 960 TCR ⁇ clones that contains at least one representative from each of the 650 possible human V-J ⁇ combinations. This set of clones is used for molecular and statistical optimizations.
  • a plasmid library of human TCR ⁇ is generated as described above in Example 4. About 3,000 transformant colonies are picked and the clones are sequenced using standard capillary sequencing (e.g., Sequetech). The V-J ⁇ pairing corresponding to each sequenced clone is identified as described above in Example 4. The goal is to obtain at least one representative clone for each V-J ⁇ pair.
  • V-J ⁇ pairs are missing, those pairs are rescued by making libraries of TCR ⁇ using only primers for those missing V-J ⁇ pairs, subcloning, and sequencing. After several rounds, clones are identified for every possible V-J ⁇ pair. These plasmids are mixed into a single template mixture, with 96 clones at each concentration and 10 different concentrations across three orders of magnitude.
  • V(D)J ⁇ combinations result in an assortment GC contents and lengths.
  • the amplification bias is tested after addition of various reagents, such as betaine or magnesium chloride.
  • Approximately 60 TCR ⁇ libraries are generated from the plasmid mixture, with four replicates for each of 15 different buffers.
  • the library mixtures are quantified and ⁇ 4 million sequences are obtained from each library using a GAIIx next-gen sequencer (Illumina).
  • the V-J ⁇ pairing is identified corresponding to each sequenced clone as described above in Example 4, and the counts of sequence tags are tabulated for each clone in each data set.
  • Methods of the invention are applied to post-transplant immune monitoring. After an allogeneic transplant (i.e., kidney or liver), a host's T cells response to transplants are assessed to monitor the health of the host and the graft. Molecular monitoring of blood or urine is helpful to detect acute or chronic rejection before a biopsy would typically be indicated. For example, detection of alloantibodies to human leukocyte antigen (HLA) has been associated with chronic allograft rejection (Terasaki and Ozawa, 2004 American Journal of Transplantation 4:438-43).
  • HLA human leukocyte antigen
  • molecular markers include b 2 -microglobulin, neopterin, and proinflammatory cytokines in urine and blood (Sabek et al., 2002 Transplantation 74:701-7; Tatapudi et al., 2004 Kidney International 65:2390; Matz et al., 2006 Kidney International 69:1683; Bestard et al., 2010 Current Opinion in Organ Transplantation 15:467-473).
  • Treg regulatory T cells
  • Th down-regulating helper T cells
  • transplanting hematopoietic stem cells from HLA-mismatched donors into the recipient has resulted in long-term nonimmunosuppressive renal transplant tolerance up to 5 years after transplant (Kawai et al., 2008 NEJM 358:353-61).
  • Primers are designed that target transcripts from several immune functionality genes (described above), which produce overlap extension fusion constructs with CDR3 ⁇ amplicons.
  • these primers are designed to specifically amplify cDNA by spanning RNA splice junctions and hybridize to cDNA from processed messenger RNA.
  • molecules that are associated with immune function include, but are not limited to, T-BET and IFN-g, which indicate T helper 1 cells (Th1); GATA3 and IL-4, which indicate T helper 2 cells (Th2); IL-17, which indicates T helper 17 cells (Th17); and FoxP3 and IL-10, which indicate T regulatory cells (Treg).
  • Such signaling molecules are members of large protein families with strong homology between paralogues, which may result in background amplification during PCR. Accordingly, nucleotide alignments of all of the paralogues in each family (i.e., all of the interleukin genes) are generated and PCR primers are designed that span exons and have the lowest possible sequence homology to other genes in the family.
  • Functional T cell monitoring involves the following steps: (i) isolation of single peripheral blood mononuclear cells in emulsion microdroplet reactors; (ii) overlap extension amplification of complexes between TCR ⁇ and immune functionality molecules in microdroplet reactors; and (iii) emulsion reversal followed by bulk sequencing.
  • the TCR ⁇ and immune functionality primer sets will be combined to produce major amplicon fusion constructs from the minor amplicons.
  • the overlap extension primers are a combination of the reverse TCR ⁇ primers with approximately half of each immune functionality molecule forward primer, which results in a total of 91 fusion reverse TCR ⁇ primers.
  • the fusion primers between the forward primer for each immune functionality minor amplicon contain approximately half of each of the 13 TCR ⁇ reverse primers, for a total of 91 fusion reverse immune functionality primers.
  • the final result is that the overlap between any pair of TCR ⁇ and immune functionality minor amplicons has a melting temperature of approximately 55-65° C., such that each minor amplicon acts as a primer for the paired amplicon.
  • the outer primers are diluted to a final concentration of 0.1 ⁇ M, and the inner primers are diluted to 0.01 ⁇ M, such that the inner primers are limiting reagents.
  • Latent tuberculosis is a major global epidemic, affecting as many as 2 billion people worldwide. There is currently no reliable test for clinical diagnosis of latent TB. This technology gap has severe clinical consequences, since reactivated TB is the only reliable hallmark of latent TB. Furthermore, clinical trials for vaccines and therapies lack biomarkers for latent TB, and therefore must follow cohorts over many years to prove efficacy.
  • BCG Bacillus Calmette-Guérin
  • TST tuberculin skin test
  • T cell responses are used to distinguish latent from active TB (Schuck et al., 2009 PLoS One 4:e5590).
  • the premise of this prior work is that immune cells directed against TB antigens will be expanded in the memory T cell population if the TB is latent, but expanded in a helper T cell fraction if the TB is active.
  • Functional T cell sequencing is used to distinguish latent TB from cleared TB.
  • the protocol involves: (i) capture of single T cells in emulsion microdroplets; (ii) microdroplet reverse transcription and amplification at target loci; (iii) microdroplet synthesis of fusion complexes between two or more target loci; and (iv) reversing emulsions and sequencing major amplicons with bulk sequencing. Sequence specific PCR is used after overlap extension RT-PCR to detect the presence of a particular biomarker for latent TB.
  • T cell monitoring is used for diagnosis and monitoring of nearly any human disease.
  • diseases include but are not limited, to systemic lupus erythmatosis (SLE), allergy, autoimmune disease, heart transplants, liver transplants, bone marrow transplants, lung transplants, solid tumors, liquid tumors, myelodysplastic syndrome (MDS), chronic infection, acute infection, hepatitis, human papilloma virus (HPV), herpes simplex virus, cytomegalovirus (CMV), and human immunodeficiency virus (HIV).
  • SLE systemic lupus erythmatosis
  • MDS myelodysplastic syndrome
  • HPV human papilloma virus
  • CMV cytomegalovirus
  • HAV human immunodeficiency virus
  • Such monitoring includes individual diagnosis and monitoring or population monitoring for epidemiological studies.
  • T cell monitoring is used for research purposes using any non-human model system, such as zebrafish, mouse, rat, or rabbit. T cell monitoring also is used for research purposes using any human model system, such as primary T cell lines or immortal T cell lines.
  • Antibodies are produced by recombined genomic immunoglobulin (Ig) sequences in B lineage cells.
  • Immunoglobulin light chains are derived from either ⁇ or ⁇ genes.
  • the ⁇ genes are comprised of four constant (C) region genes and approximately thirty variable (V) region genes.
  • the ⁇ genes are comprised of one C region gene and 250 V region genes.
  • the heavy chain gene family is comprised of several hundred V gene segments, fifteen D gene segments, and four joining (J) gene segments. Somatic recombination during B cell differentiation randomly chooses one V-D-J combination in the heavy chain and one V-J combination in either ⁇ or ⁇ light chain. Because there are so many gene segments, millions of unique combinations are possible.
  • V regions also undergo somatic hypermutation after recombination, generating further diversity.
  • V regions also undergo somatic hypermutation after recombination, generating further diversity.
  • dozens of primers targeting conserved sequences to sequence the full heavy and light chain complement in several multiplexed reactions (van Dongen et al., 2003 Leukemia 17: 2257-2317).
  • a first target nucleic sequence, a second target nucleic acid sequence or both target nucleic acid sequences can comprise an immunoglobulin sequence.
  • the first target nucleic acid sequence can comprise an immunoglobulin sequence
  • the second sequence can comprise a second molecule associated with immune cell function.
  • Examples of functional B cell marker molecules include, but are not limited to, major histocompatibility complex (MHC), cluster of differentiation 19 (CD19), interleukin 7 receptor (IL-17 receptor), cluster of differentiation 10 (CD 10), cluster of differentiation 20 (CD20), cluster of differentiation 22 (CD22), cluster of differentiation 34 (CD34), cluster of differentiation 27 (CD27), cluster of differentiation 5 (CD5), and cluster of differentiation 45 (CD45), cluster of differentiation 38 (CD38), cluster of differentiation 78 (CD78), interleukin-6 receptor, Interferon regulatory factor 4 (IRF4), and cluster of differentiation 138 (CD138).
  • MHC major histocompatibility complex
  • CD19 interleukin 7 receptor
  • IL-17 receptor interleukin 7 receptor
  • CD 10 cluster of differentiation 20
  • CD22 cluster of differentiation 22
  • CD34 cluster of differentiation 34
  • CD27 CD27
  • CD5 cluster of differentiation 5
  • CD45 cluster of differentiation 45
  • CD45 cluster of differentiation 38
  • CD78 cluster of differentiation 78
  • IRF4 Interferon regulatory factor 4
  • This assay s all of the B cell clonotypes in a particular functional group, such as Bmem. Alternatively, a primer pool that amplifies the full IgH complement of B cells is combined with dozens of B cell marker primer pairs. This assay provides the full phenotype for each clonotype in the cell mixture.
  • IgH and Ig ⁇ are linked in single cells to immune functionality molecules that indicate B cell activity or subpopulations.
  • the vast majority of diversity in the B cell repertoire is comprised of the V-D-J regions of IgH and V-J regions of Ig ⁇ (Sandberg et al., 2005 Journal of Molecular Diagnostics 7:495-503; Boyd et al., 2009 Science Translational Med 1:12ra23).
  • Previously-reported primer pools van Dongen et al., 2003 Leukemia 17: 2257-2317 are used to amplify these regions of IgH and Ig ⁇ .
  • Antibody therapeutics are increasingly used by pharmaceutical companies to treat intractable diseases such as cancer (Carter 2006 Nature Reviews Immunology 6:343-357).
  • the process of antibody drug discovery is expensive and tedious, requiring the identification of an antigen, and then the isolation and production of monoclonal antibodies with activity against the antigen.
  • Individuals that have been exposed to disease produce antibodies against antigens associated with that disease, so it is possible mine patient immune repertoires for antibodies that could be used for pharmaceutical development.
  • a functional monoclonal antibody requires both heavy and light chain immunoglobulins.
  • Overlap extension PCR and/or overlap extension RT-PCR in single cell emulsion microdroplets is used to capture functional antibody sequences from patient B cell repertoires.
  • the method involves the following steps: (i) isolation of single B cells in aqueous-in-oil microreactors using a microfluidic device; (ii) molecular linkage between heavy and light chain immunoglobulin (IgH and Ig ⁇ ) amplicons inside the single cell microreactors; and (iii) reversal of the emulsions followed by bulk sequencing of the linked polynucleic acid sequences.
  • the fusion primer sequences for overlap extension PCR and overlap extension RT-PCR are identical to the independent IgH and Ig ⁇ primers, except certain primers contain additional polynucleotide sequences for overlap extension: (i) the forward primer of the IgH locus has a random 10-20 nt sequence with no complementarity to either target; (ii) the reverse primer of the IgH loci has a 10-20 nt sequence with complementarity to the forward primer of Ig ⁇ , and (iii) the forward primer of Ig ⁇ has complementarity to the reverse primers for the IgH locus.
  • the outer primers are diluted to a final concentration of 0.1 ⁇ M, and the inner primers are diluted to 0.01 ⁇ M, such that the inner primers will be a limiting reagent. This drives formation of the major amplicon.
  • Humoral memory B cells help mammalian immune systems retain certain kinds of immunity. After exposure to an antigen and expansion of antibody-producing cells, Bmem cells survive for many years and contribute to the secondary immune response upon re-introduction of an antigen. Such immunity is typically measured in a cellular or antibody-based in vitro assay. In some cases, it is beneficial to detect immunity by amplifying, linking, and detecting IgH and light chain immunoglobulin variable regions in single B cells. Such a method is more specific and sensitive than current methods. Massively parallel B cell repertoire sequencing is used as described in Example 13 to screen for Bmem cells that contain a certain heavy and light chain pairing which is indicative of immunity.
  • single cell heavy and light chain pairing are combined with functional B cell sequencing, i.e., developing overlap extension RT-PCR primers that target RNA transcripts that are overrepresented in Bmem cells (i.e., CD27).
  • functional B cell sequencing i.e., developing overlap extension RT-PCR primers that target RNA transcripts that are overrepresented in Bmem cells (i.e., CD27).
  • B cell monitoring is used for diagnosis and monitoring of nearly any human disease.
  • diseases include, but are not limited to, systemic lupus erythmatosis (SLE), allergy, autoimmune disease, heart transplants, liver transplants, bone marrow transplants, lung transplants, solid tumors, liquid tumors, myelodysplastic syndrome (MDS), chronic infection, acute infection, hepatitis, human papilloma virus (HPV), herpes simplex virus (HSV), cytomegalovirus (CMV), and human immunodeficiency virus (HIV).
  • SLE systemic lupus erythmatosis
  • MDS myelodysplastic syndrome
  • HPV human papilloma virus
  • HSV herpes simplex virus
  • CMV cytomegalovirus
  • HMV human immunodeficiency virus
  • Such monitoring could include individual diagnosis and monitoring or population monitoring for epidemiological studies.
  • B cell monitoring is also used for research purposes using any non-human model system, such as zebrafish, mouse, rat, or rabbit.
  • B cell monitoring is used for research purposes using any human model system, such as primary B cell lines or immortal B cell lines.
  • FNRBCs circulating fetal nucleated red blood cells
  • Nucleated red blood cells are among the first hematopoietic cell types produced during fetal development. These cells cross the placenta and are detectable at low concentrations in maternal blood during the first trimester (Ganshirt et al., 1994 Lancet 343:1038-9).
  • Another attractive feature of FNRBCs is their short lifespan compared to other circulating fetal cell types (Pearson, 1967 Journal of Pediatrics 70:166-71), making them unlikely to persist in maternal blood from previous pregnancies.
  • LCR or padlock probes are used to capture and amplify paternal-specific alleles in an allele-specific manner and to perform overlap extension PCR to detect disease alleles ( FIGS. 26-30 ).
  • the method involves the following steps: (i) parental genotyping to find paternal-specific polymorphisms; (ii) isolation of single mononuclear cells from maternal blood into emulsion microdroplets; (iii) amplification of disease and paternal-specific “linker” loci by a modified LCR/PCR protocol in emulsion microdroplet reactors; (iv) overlap extension amplification of complexes between disease and linker loci in microdroplet reactors; (v) recovery of linked complexes by emulsion reversal; and (vi) massively parallel sequencing.
  • the massively parallel sequencing data are analyzed to quantify instances of linked genotypes.
  • Only microdroplet reactors that contain single fetal cells yield linked complexes between the disease locus and the paternal-specific allele. Both alleles amplify from the fetal cell, providing the physician with status as a carrier, homozygous normal, or homozygous affected.
  • LCR probes are designed to target a locus associated with a disease and a linker SNP locus.
  • the LCR probes are 20-30 nucleotides long and have melting temperatures (Tm) of approximately 55-65° C.
  • Tm melting temperatures
  • the 5′ nucleotides are phosphorylated, and probes are designed to minimize probe self-complementarity, as well as complementarity between probes.
  • three of the probes include polynucleotide sequences that enable amplification after ligation: (i) the 5′ probe for the disease locus have a random 10-20 nt sequence with no complementarity to either target locus; (ii) the 3′ probe for the disease locus has a 10-20 nucleotide sequence with complementarity to the 5′ end of the linker SNP locus; and (iii) the 5′ probe for the linker SNP locus have complementarity to the 3′ end of the disease locus ( FIGS. 26-30 ).
  • a reaction mixture is formulated using cell line genomic DNA, the LCR probes, the PCR primers, Ampligase (Epicentre), Stoffel fragment DNA polymerase (Life Technologies), and reaction buffer (after Hardenbol et al., 2005; 20 mM Tris-HCl, 25 mM KCl, 10 mM MgCl 2 , 0.5 mM NAD, 0.01% Triton X-100).
  • the “inner” probes are added at 1/10 th of the concentration of the other oligonucleotides in the reaction.
  • the mixtures are incubated for 4 minutes at 20° C., 5 minutes at 95° C., and 15 minutes at 60° C. Then, standard PCR thermocycling conditions are used to amplify the minor and major amplicons (e.g., 95° C., 5 minutes; [95° C., 30 seconds; 60° C., 30 seconds; 72° C., 30 seconds] ⁇ 30 cycles).
  • disease and unaffected alleles are analyzed to diagnose the fetus as homozygous normal, heterozygous carriers, or homozygous affected.
  • major amplicons linked to the paternal-specific allele comprise approximately 50% disease alleles and 50% normal alleles.
  • major amplicons linked to the paternal-specific allele comprise of nearly 100% disease alleles. This method can be extended beyond single nucleotide mutations to find paternal-allele specific gene expression patterns and/or multiplexed analysis of many germline mutations in circulating fetal cells.
  • genes that are often mutated and are of interest in prenatal diagnostics include, but are not limited to, cystic fibrosis transmembrane receptor (CFTR), aspartoacylase (ASPA), Fanconi anemia, complementation group C (FANCC), Glucose-6-phosphatase (G6CP), Glucocerebrosidase (GBA), Hexosaminidase A (HEXA), hemoglobin beta (HBB), Frataxin (FXN), low density lipoprotein receptor (LDLR), and methyl CpG binding protein 2 (MECP2).
  • cystic fibrosis transmembrane receptor CFTR
  • ASPA aspartoacylase
  • Fanconi anemia FANCC
  • FANCC complementation group C
  • G6CP Glucose-6-phosphatase
  • G6CP Glucocerebrosidase
  • HEXA Hexosaminidase A
  • HBB hemoglobin beta
  • Frataxin FXN
  • the target nucleic acid (g) is a paternal-specific allele
  • the target nucleic acid (h) is a first disease allele
  • the target nucleic acid (i) is a second disease allele.
  • both alleles (h) and (i) are amplified in any cell (j) that contains the paternal-specific variant, and no major amplicons are produced in cells that lack the paternal-specific nucleotide variant.
  • Primer (a) is a forward LCR probe and primer (b) is a reverse LCR probe for amplifying target nucleic acid (g).
  • Primer (e) is a forward PCR primer and primer (f) is a reverse PCR primer for both disease alleles (h) and (i).
  • the forward primer targeting the disease locus has a region of complementarity to the reverse probe targeting the paternal-specific nucleotide variant.
  • the process can be carried out in an emulsion droplet or reaction container (k).
  • FIG. 27 also shows an example of hybridization of primers and target nucleic acids in a single cell sequence linkage by ligase chain reaction combined with overlap extension polymerase chain reaction, as applied to a method for noninvasive prenatal diagnosis, according to one embodiment of the invention.
  • the process is carried out in an emulsion droplet or reaction container (k).
  • FIG. 28 shows an example of resulting amplicons produced in a single cell sequence linkage by ligase chain reaction combined with overlap extension polymerase chain reaction, as applied to a method for noninvasive prenatal diagnosis, according to one embodiment of the invention.
  • FIG. 29 shows hybridization of overlapping complementary regions of the resulting amplicons, and overlap extension polymerase chain reaction, as applied to a method for noninvasive prenatal diagnosis, according to one embodiment of the invention.
  • FIG. 30 illustrates the resulting amplicons that are produced from the overlap extension polymerase chain reaction, as applied to a method for noninvasive prenatal diagnosis.
  • the end product is a library of “major amplicons,” or linked loci, which can then be sequenced in bulk.
  • Methods for genetic disease detection are adapted for noninvasive prenatal molecular karyotyping.
  • Such a method involves the following steps: (i) parental genotyping to find paternal-specific polymorphisms; (ii) isolation of single mononuclear cells from maternal blood into emulsion microdroplets; (iii) amplification of disease and paternal-specific “linker” loci by a modified LCR/PCR protocol in emulsion microdroplet reactors; (iv) overlap extension amplification of complexes between tens to thousands to hundreds of thousands of chromosomal probes and linker loci in microdroplet reactors; (v) recovery of linked complexes by emulsion reversal; and (vi) massively parallel sequencing.
  • the massively parallel sequencing data are analyzed to quantify instances of linked genotypes. Only microdroplet reactors that contain single fetal cells yield linked complexes between the chromosomal probes and the paternal-specific allele.
  • the chromosomal probes are used to quantify the number of chromosomes or chromosome segments present in the fetal cells, and, by association, the fetus. Chromosome copy number is quantified by comparing sequence counts from an unknown chromosome to sequence counts from a known reference chromosome within a single experiment, or by looking for allelic imbalance (Johnson et al., 2010 Human Reproduction 25:1066-75).
  • This method is also used to detect a variety of chromosome disorders, including aneuploidy, unbalanced structural chromosome disorders, microdeletions, microinsertions, and other kinds of congenital disorders.
  • disorders of interest include Trisomy 13, Trisomy 18, and Trisomy 21.
  • Noninvasive methods for diagnosis can enable molecular staging of tumors prior to biopsy, which can both reduce cost and lead to better clinical outcomes.
  • noninvasive methods are used to assess the success of the treatment regimen without the need for invasive and expensive re-biopsy.
  • There is general consensus among clinicians that noninvasive methods for characterization of tumors would greatly benefit patients and increase the probability of favorable outcomes.
  • Single cell overlap extension PCR, LCR, padlock probes, and/or RT-PCR are used to specifically analyze only tumor cells in heterogeneous cell populations, such as cerebrospinal fluid (CSF) or blood ( FIGS. 18-25 ). Unlike current methods, this approach completely bypasses the complexities caused by differences in cell surface markers and morphology. Such methods are particularly useful in cancers where a biopsy is invasive and expensive, and the treatment decisions, such as pharmacological therapy decisions, would benefit from molecular analysis of the tumor.
  • the technology is used for any kind of tumor or any kind of genetic problem or combination of genetic problems in tumors.
  • Single cell overlap extension PCR, LCR, padlock probes, and/or RT-PCR is used to amplify a first nucleic acid or a second nucleic acid that is associated with cancer.
  • the first target nucleic acid includes a rare somatic mutation and the second target is a gene transcript associated with cancer.
  • one sequence is a molecular barcode and the second sequence is either a rare mutation sequence or a gene transcript associated with cancer.
  • higher levels of multiplexing produce single-cell expression patterns for 10, 100, 1000, 10,000 transcripts or even all transcripts in the cell.
  • the rare gene sequence is present in fewer than 5% of the cells, fewer than 1% of the cells, or fewer than 0.1% of the cells.
  • the rare gene sequence results from a genetic mutation.
  • the genetic mutation can be a somatic mutation.
  • the genetic mutation can be a mutation in a gene selected from the group consisting of: epidermal growth factor receptor (EGFR), phosphatase and tensin homolog (PTEN), tumor protein 53 (p53), MutS homolog 2 (MSH2), multiple endocrine neoplasia 1 (MEN1), adenomatous polyposis coli (APC), Fas receptor (FASR), retinoblastoma protein (Rb1), Janus kinase 2 (JAK2), (ETS)-like transcription factor 1 (ELK1), v-ets avian erythroblastosis virus E26 oncogene homolog 1 (ETS1), breast cancer 1 (BRCA1), breast cancer 2 (BRCA2), hepatocyte growth factor receptor (MET), ret protoco-oncogene (RET), V-erb-b2 erythroblastic leukemia viral oncogene homolog 2 (HER2), V-Ki-ras2 Kirsten rat s
  • the cancer-associated transcript is a gene selected from the group consisting of epidermal cell adhesion molecule (EpCAM), V-erb-b2 erythroblastic leukemia viral oncogene homolog 2 (HER2), estrogen receptor (ER), Signal transducer and activator of transcription 3 (STAT3), CCAAT-enhancer-binding proteins (C/EBP), prostate-specific antigen (PSA), androgen receptor (AR), progesterone receptor (PR), Jun B (JUNB), Ras-related protein Rab-31 (RAB31), Early growth response protein 1 (EGR1), B-cell lymphoma 2 (BCL2), Protein C-ets-1 (ETS1), FBJ murine osteosarcoma viral oncogene homolog (c-Fos), and Insulin-like growth factor 1 (IGF-1).
  • STAT2 epidermal cell adhesion molecule
  • HER2 V-erb-b2 erythroblastic leukemia viral oncogene homolog 2
  • the cancer-associated transcripts can multiplexed to produce a signal from 10, 100, 1000, 10,000 transcripts, or all of the transcripts in the cell, which is analyzed by next-generation sequencing to identify a mutation.
  • the mutation is associated with cancer.
  • the cancer is selected from the group consisting of lung carcinoma, non-small cell lung cancer, small cell lung cancer, uterine cancer, thyroid cancer, breast carcinoma, prostate carcinoma, pancreas carcinoma, colon carcinoma, lymphoma, Burkitt lymphoma, Hodgkin lymphoma, myeloid leukemia, leukemia, sarcoma, blastoma, melanoma, seminoma, brain cancer, glioma, glioblastoma, cerebellar astrocytoma, cutaneous T-cell lymphoma, gastric cancer, liver cancer, ependymona, laryngeal cancer, neck cancer, stomach cancer, kidney cancer, pancreatic cancer, bladder cancer, esophageal cancer, testicular cancer,
  • the methods in this Example can be applied in an assay using intact mammalian cell mixtures to detect cancer cells.
  • the non-small cell lung carcinoma cells CRL-5908 (ATCC) is used as a cancer model and Jurkat cells are used as a stand-in for primary lymphocytes.
  • CRL-5908 has an L858R point mutation in EGFR, and expresses EpCAM.
  • Jurkat does not express EpCAM (Landolin et al., 2010).
  • Cell mixtures are created at six CRL-5908:Jurkat ratios between of 0% and 1%. Cells are encapsulated from the mixtures with beads into a lysis mix, and then merged with a stream containing a RT-PCR mix using the methods described above.
  • >1 million droplets are generated in each of six replicate experiments for each cell mixture.
  • a fast-speed camera is used to obtain bead and cell encapsulation rates.
  • the major amplicons are purified by gel electrophoresis and sequenced by next-generation sequencing to obtain at least 10 million sequence tags for each library.
  • Detecting cancer cells in these cell mixtures requires a special analytical framework. Sequencing generates counts of mutated EGFR and EpCAM linked to each barcode, and the barcodes are traced back to cells. If each droplet contains a single cell only, then these counts are used to directly quantify the percentage of CRL-5908 in the cell mixture. However, there may be an arbitrary number of cells encapsulated in droplets according to a Poisson distribution, resulting in many droplets with multiple cells.
  • an algorithm that computes the number of cancer cells in a sample given counts of cancer markers such as mutated EGFR or EpCAM and statistics for cell encapsulation Poisson ⁇ .
  • cancer markers such as mutated EGFR or EpCAM and statistics for cell encapsulation Poisson ⁇ .
  • the process of encapsulation is simulated, and the ratio of cancer marker expression in cancer cells to normal cells is determined.
  • a Poisson distribution for the cell encapsulation rate is assumed, log-normally distributed expression levels over a fixed background, and the signal-to-noise ratio (SNR) is defined as the ratio of the mean expression level to the mean background.
  • SNR signal-to-noise ratio
  • GBM glioblastoma multiforme
  • the method involves the following steps: (i) isolation of mononuclear cells from CSF (Spriggs 1954 ; Journal of Clinical Pathology 7:122) with emulsion microdroplet technology; (ii) reverse transcriptase polymerase chain reaction targeting C/EBP ⁇ , STAT3, and a linker barcode sequence unique to each microdroplet; (iii) overlap extension amplification of complexes between C/EBP ⁇ , STAT3, and the linker sequence; (iv) recovery of linked complexes by emulsion reversal; and (v) digital quantification of fusion complexes using next-generation sequencing. Only microdroplet reactors that contain tumor cells co-expressing C/EBP ⁇ and STAT3 yield large numbers of complete linked complexes. Though next-generation sequencing pools all analytes from all cells, linker barcode sequences enable the trace back of gene expression to single cells. The final result is digital quantification of multiple linked transcripts that are traced back to millions of single cells analyzed in parallel.
  • the method also provides cDNA synthesis and PCR in emulsion microdroplets without buffer exchange or reagent addition between the molecular steps.
  • Thermostable reverse transcriptase (RT) enzymes are used that withstand temperatures >95° C., such as ThermoScript RT (Lucigen) and GeneAmp Thermostable rTth (Life Technologies).
  • RT reverse transcriptase
  • three of the primers in the set include polynucleotide sequences that enable amplification of a fusion complex: (i) the 5′ primer of the C/EBP ⁇ locus has a random 10-20 nt sequence with no complementarity to either target locus; (ii) the 3′ primer of the C/EBP ⁇ locus has a 10-20 nt sequence with complementarity to the 5′ end of the linker barcode oligonucleotide; (iii) the 5′ probe of the STAT3 locus has complementarity to the 3′ end of the linker. Two more oligonucleotides act as forward and reverse PCR primers to specifically amplify the linker barcode oligonucleotide.
  • the “inner” primers of the STAT3 and C/EBP ⁇ loci are at limiting concentration, i.e., 0.01 ⁇ M for the inner primers and 0.1 ⁇ M for all other primers. This drives amplification of the major amplicon preferentially over the minor amplicons.
  • the major amplicons are subjected to bulk sequencing.
  • the barcode is linked to C/EBP ⁇ and STAT3 sequences, and are used to trace back the major amplicons to a single cell ( FIGS. 18-25 ). With trace back of each sequence to an original single cell, it is possible to tabulate genetic data for each single cell, which then enables single cell transcript quantification, i.e., single cell gene expression levels which are translated to a clinically actionable diagnosis.
  • chromosome changes such as loss of heterozygosity (LOH) or gain of full chromosomes or segments thereof, will lead to progression of a tumor (Parsons et al., 2008 Science 321:1807-1812).
  • Clinicians often examine the karyotype of a tumor to formulate a prognosis and treatment regimen.
  • the methods outlined above are adapted to analyze both gene expression and detect chromosome abnormalities for any tumor type in a single multiplexed reaction.
  • a mutant cancer sequence is linked to probes to determine chromosome copy number or structural chromosome aberrations.
  • Such a method involves the following steps: (i) isolation of single mononuclear cells from blood into emulsion microdroplets; (ii) amplification of chromosome probes and cancer mutation “linker” loci by a modified LCR/PCR protocol in emulsion microdroplet reactors; (iii) overlap extension amplification of complexes between chromosomal probes and mutant linker loci in microdroplet reactors; (iv) recovery of linked complexes by emulsion reversal; and (v) massively parallel sequencing.
  • the massively-parallel sequencing data is analyzed to quantify instances of linked genotypes. Only microdroplet reactors that contain cells with cancer mutations yield linked complexes between the chromosomal probes and the cancer-specific sequence.
  • the chromosomal probes are used to quantify the number of chromosomes or chromosome segments present in circulating cancer cells, and, by association, the tumor. Chromosome copy number is quantified by comparing sequence counts from an unknown chromosome to sequence counts from a known reference chromosome within a single experiment, or by looking for allelic imbalance (Johnson et al., 2010 Human Reproduction 25:1066-75).
  • This method is also used to detect a variety of chromosome disorders, including aneuploidy, unbalanced structural chromosome disorders, microdeletions, microinsertions, and other kinds of congenital disorders.
  • the chromosome probes are linked to a barcode sequence rather than a cancer mutation, such that massively parallel sequencing measures chromosomal disorders in all of the cells in the assay rather than just cells that harbor a particular mutation.
  • somatic cell mutations i.e., in tumor promoter genes such as p53, p16, and/or EGFR, contribute to the progression of cancer (Parsons et al., 2008 Science 321:1807-1812).
  • Clinicians often analyze tumors for such known somatic cell mutations to formulate a prognosis and treatment regimen.
  • somatic cell mutations are often indicative of progression to more aggressive stages of a tumor.
  • the methods described above are adapted to analyze gene expression, somatic cell mutations, and/or chromosomal changes for any tumor type in multiplexed emulsion microdroplet reactions on millions of single cells in parallel. If somatic cell mutations are known, a molecular barcode is not necessary because allele-specific LCR or padlock probes are used to specifically amplify major amplicons only in cells that harbor the somatic cell mutation.
  • any combination of gene expression, molecular karyotyping, and somatic cell mutation analysis is carried out in single tumor cells in heterogeneous cell populations.
  • LCR or padlock probes are used to affect allele-specific locus capture and major amplicon amplification only in cells with a particular somatic cell mutation.
  • This method is an alternative to the molecular barcode method described above at least at Section B.6), achieving tumor cell-specific genetic analysis in a highly heterogeneous mixed background of cells.
  • the allele-specific somatic cell mutation amplification are linked to RNA transcripts associated with disease outcomes and/or probes for quantification of loss of heterozygosity (LOH) or regional duplications in chromosome.
  • LH loss of heterozygosity
  • the method is used to analyze co-expression of two or more microRNA sequences in single cells, or co-expression of a microRNA with another transcript, a methylated DNA sequence, or somatic cell mutation.
  • Certain applications require multiplexed analysis of cell populations that are chimers between two organisms. For example, after hematopoietic stem cell (HSC) transplantation, the host's T and B cells are chimeric between the host and graft. PCR amplification in a chimeric cell population of a variable genetic locus combined with some kind of functional genetic locus, such as an RNA transcript, enables analysis of the functional genetic locus in an individual-specific manner.
  • HSC hematopoietic stem cell
  • nonmyeloablative hematopoietic stem cell transplantation Physicians lack powerful tools for monitoring patients after nonmyeloablative allogeneic hematopoietic stem cell (HSC) transplants (Pollack et al., 2009 American Journal of Clinical Oncology 32:618-28).
  • HSC nonmyeloablative allogeneic hematopoietic stem cell
  • the host immune system is a chimera between host and graft T cells.
  • the chimera is a poorly characterized tissue, and chimeric instability is associated with poor outcome.
  • graft-versus-tumor effect GVT
  • graft-versus-host disease GVHD
  • susceptibility to infection T cells appear to play a major role in mediating each of these processes through adaptive immunity and T cell receptor (TCR) antigen recognition.
  • TCR T cell receptor
  • a method is used to monitor chimeric T cell populations.
  • TCR ⁇ and host- and graft-specific single nucleotide polymorphisms are linked by overlap extension PCR or overlap extension RT-PCR in single cell microdroplets.
  • This method involves the following steps: (i) genotyping to find SNPs specific to the graft and host; (ii) post-transplant isolation of single cells from host blood in emulsion microdroplets; (iii) overlap extension PCR amplification of fusion complexes between SNPs and TCR ⁇ in microdroplet reactors; and (iv) recovery and sequencing of SNP-TCR ⁇ linkage complexes by emulsion reversal.
  • the result is a library of TCR ⁇ sequences with linkage to host or graft.
  • the TCR ⁇ sequences are correlated with clinical outcomes over time.
  • T cell chimerism analysis is adaptable to applications such as B cell analysis or any other subpopulation of mononuclear cells in blood. Additionally, the method is combinable with functional T cell sequencing to indicate the immune activity of particular T cell clones.
  • chimeric cell population analysis outside of the field of medicine.
  • an investigator may create chimeric organisms, such as fruit flies, mice, or rats, which are chimers between multiple individuals with different genetic backgrounds, or even between multiple species.
  • Chimeric cell populations for RNA transcripts, DNA methylation, somatic cell mutations, presence of a recombinant gene, or a variable DNA region are also capable of analysis with this method.
  • methods for analysis of chimeric T and B cell populations are adapted to other organisms and other kinds of cell populations. Additionally, such methods are used for allogeneic or autologous cellular therapeutics.
  • physicians lack powerful tools for monitoring patients after immune cells have been introduced either from a donor or as previously harvested from the patient. T cells, B cells, or NK cells are monitored to establish characteristics and efficacy of therapy.
  • the method includes mutagenizing cells, capturing single cells in aqueous-in-oil microdroplets, and then fusing an amplified putative regulatory locus with RNA transcripts from the nearby gene. In this way, mutations in regulatory sequences could be linked with gene expression levels.
  • sperm cells are captured in aqueous-in-oil microdroplets, and then several variable genetic loci are fused in the cells, such as SNPs or STRs. This enables massively parallel molecular phasing.
  • An method for phasing of two loci is provided. Haplotypes millions of single sperm are analyzed in parallel. The method involves the following steps: (i) isolation of single sperm cells using emulsion microdroplet technology; (ii) amplification of two genetic variants by PCR in microdroplet reactors; (iii) overlap extension PCR amplification of fusion complexes between the variants in microdroplet reactors; and (iv) recovery of linked complexes by emulsion reversal. The result is a library of phased haplotypes, which are then sequenced using next-generation sequencing.
  • Some kinds of industrial applications require improved enzymes and/or biological strains to optimize engineered biosystems.
  • enzymes that degrade a particular kind of industrial waste might not be found in nature, but in vitro evolution of existing enzymes might result in an optimized enzyme.
  • Many such processes benefit from molecular genetic analysis of multiple loci in millions of single cells analyzed in parallel.
  • yeast cells are mutagenized and grown on special media containing xylose as the primary food source.
  • the single yeast cells are captured in aqueous-in-oil microdroplets, and then several metabolic pathway genes are sequenced.
  • At least one company (Microbiogen, Sydney, AUS) is developing yeast strains for growth on xylose, but is using slow, traditional screening methods.
  • T cell sequencing and B cell sequencing are applicable to animals. These animals include, but are not limited to, cows, pigs, chickens, or salmon, etc.
  • livestock and other agricultural animals suffer from infectious disease, which results in considerable economic hardships.
  • the methods described herein are adaptable to improve monitoring and detection of infectious disease in an agricultural setting.
  • Metagenomics is a method of studying genetic diversity in ecosystems in which environmental samples are directly sequenced.
  • cells such as algae in environmental samples such as seawater are separated into single cell emulsion microdroplets, and then analyzed for at least two genetic loci.
  • an investigator may be interested to find a particular species of algae that expresses a particular form of chlorophyll and belongs to a particular algal species.
  • Genotyping by LCR is used to amplify major amplicons only algal cells from a particular species that harbor that particular form of chlorophyll.
  • DNA methylation is a type of epigenetic modifier that helps cells control RNA transcription and other cellular processes (Brunner et al., 2009 Genome Research 19:1044-56). For example, blood lymphocytes can suffer aberrant DNA methylation, leading to liquid tumors.
  • the methods described above are useful for analyzing DNA methylation in single cells (e.g., multiple DNA methylation loci in single cells, or at least one DNA methylation locus with an RNA transcript target or DNA sequence target).
  • DNA methylation is analyzed by methylation-specific restriction enzymes, bisulfate conversion, or precipitation with anti-methylcytosine. Most of these analyses would require multiple inputs of reaction buffers if using a microfluidic chip to create emulsion microdroplets.
  • performing bisulfite conversion requires a buffer that is inappropriate for PCR, LCR, RT-PCR, or padlock probes.
  • single cells are encapsulated in emulsion microdroplets using a standard bisulfite conversion buffer. Then, after bisulfite conversion, the microdroplets are merged with a second aqueous buffer. This second buffer dilutes the bisulfite conversion buffer, enabling PCR, LCR, RT-PCR, or padlock probe methods. Similar approaches are useful for anti-methylcytosine or methylation sensitive restriction digestion.
  • Chromatin immunoprecipitation is a method in which DNA is crosslinked to proteins in cell nuclei (Johnson et al., 2007 Science 316:1497-502). An antibody directed against a DNA binding protein of interest is then used to specifically precipitate DNA-protein complexes, and then the DNA is sequenced or analyzed with a DNA microarray.
  • the molecular linkage methods described above are used to analyze multiple DNA-protein binding loci in single cells, or at least one DNA-protein binding locus with an RNA transcript target or DNA sequence target. Most of these analyses require multiple inputs of reaction buffers if using a microfluidic chip to create emulsion microdroplets.
  • performing chromatin immunoprecipitation requires a buffer that is inappropriate for PCR, LCR, RT-PCR, or padlock probes.
  • single cells are encapsulated in emulsion microdroplets using a standard immunoprecipitation buffer. Then, after precipitation, the microdroplets are merged with a second aqueous buffer. This second buffer dilutes the precipitation buffer, enabling PCR, LCR, RT-PCR, or padlock probe methods.
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US20170166889A1 (en) 2017-06-15
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US10106789B2 (en) 2018-10-23
US20230313291A1 (en) 2023-10-05
US20150344871A1 (en) 2015-12-03
US9695474B2 (en) 2017-07-04
US20170204460A1 (en) 2017-07-20
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US20200140947A1 (en) 2020-05-07
US10787706B2 (en) 2020-09-29
US10465243B2 (en) 2019-11-05
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US20200291474A1 (en) 2020-09-17
US11591652B2 (en) 2023-02-28
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US11053543B2 (en) 2021-07-06
US20160326583A1 (en) 2016-11-10
US20210292835A1 (en) 2021-09-23
US20220056522A1 (en) 2022-02-24

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