US20160122817A1 - Methods and compositions for targeted nucleic acid sequencing - Google Patents

Methods and compositions for targeted nucleic acid sequencing Download PDF

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US20160122817A1
US20160122817A1 US14/927,297 US201514927297A US2016122817A1 US 20160122817 A1 US20160122817 A1 US 20160122817A1 US 201514927297 A US201514927297 A US 201514927297A US 2016122817 A1 US2016122817 A1 US 2016122817A1
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Prior art keywords
fragments
nucleic acid
targeted
regions
probes
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Mirna Jarosz
Michael Schnall-Levin
Serge Saxonov
Benjamin Hindson
Xinying Zheng
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10X Genomics Inc
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10X Genomics Inc
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Priority to US14/927,297 priority Critical patent/US20160122817A1/en
Assigned to 10X GENOMICS, INC. reassignment 10X GENOMICS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JAROSZ, MIRNA, SAXONOV, SERGE, HINDSON, BENJAMIN, SCHNALL-LEVIN, MICHAEL, ZHENG, Xinying
Publication of US20160122817A1 publication Critical patent/US20160122817A1/en
Priority to US15/174,928 priority patent/US10287623B2/en
Priority to US15/174,919 priority patent/US20160281136A1/en
Priority to US15/174,922 priority patent/US20160281161A1/en
Priority to US15/174,923 priority patent/US20160281137A1/en
Priority to US17/064,508 priority patent/US11739368B2/en
Priority to US18/346,011 priority patent/US20240035066A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6806—Preparing nucleic acids for analysis, e.g. for polymerase chain reaction [PCR] assay
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6869—Methods for sequencing
    • C12Q1/6874—Methods for sequencing involving nucleic acid arrays, e.g. sequencing by hybridisation
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6813—Hybridisation assays
    • C12Q1/6834—Enzymatic or biochemical coupling of nucleic acids to a solid phase
    • C12Q1/6837—Enzymatic or biochemical coupling of nucleic acids to a solid phase using probe arrays or probe chips
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q2535/00—Reactions characterised by the assay type for determining the identity of a nucleotide base or a sequence of oligonucleotides
    • C12Q2535/122—Massive parallel sequencing
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q2537/00—Reactions characterised by the reaction format or use of a specific feature
    • C12Q2537/10—Reactions characterised by the reaction format or use of a specific feature the purpose or use of
    • C12Q2537/159—Reduction of complexity, e.g. amplification of subsets, removing duplicated genomic regions
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q2563/00—Nucleic acid detection characterized by the use of physical, structural and functional properties
    • C12Q2563/179—Nucleic acid detection characterized by the use of physical, structural and functional properties the label being a nucleic acid
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q2565/00—Nucleic acid analysis characterised by mode or means of detection
    • C12Q2565/50—Detection characterised by immobilisation to a surface
    • C12Q2565/514—Detection characterised by immobilisation to a surface characterised by the use of the arrayed oligonucleotides as identifier tags, e.g. universal addressable array, anti-tag or tag complement array

Definitions

  • exome sequencing offers advantages over whole genome sequencing: it is significantly less expensive, is more easily understood for functional interpretation, is significantly faster to analyze, makes very deep sequencing affordable, and results in a dataset that is easier to manage.
  • the present invention provides methods, systems and compositions for obtaining sequence information for targeted regions of the genome.
  • the present disclosure provides a method for sequencing one or more selected portions of a genome, the method generally including the steps of: (a) providing starting genomic material, (b) distributing individual nucleic acid molecules from the starting genomic material into discrete partitions such that each discrete partition contains a first individual nucleic acid molecule; (c) fragmenting the individual nucleic acid molecules in the discrete partitions to form a plurality of fragments, where each of the fragments further includes a barcode, and where fragments within a given discrete partition each include a common barcode, thereby associating each fragment with the individual nucleic acid molecule from which it is derived; (d) providing a population enriched for fragments including at least a portion of the one or more selected portions of the genome; (e) obtaining sequence information from the population, thereby sequencing one or more selected portions of a genome.
  • providing the population enriched for fragments including at least a portion of the one or more selected portions of the genome includes the steps of (i) hybridizing probes complementary to regions in or near the one or more selected portions of the genome to the fragments to form probe-fragment complexes; and (ii) capturing probe-fragment complexes to a surface of a solid support; thereby enriching the population with fragments including at least a portion of the one or more selected portions of the genome.
  • the solid support includes a bead.
  • the probes include binding moieties and the surface include capture moieties, and the probe-fragment complexes are captured on the surface through a reaction between the binding moieties and the capture moieties.
  • the capture moieties include streptavidin and the binding moieties include biotin.
  • the capture moieties comprise streptavidin magnetic beads and the binding moieties comprise biotinylated RNA library baits.
  • the methods of the invention include the use of capture moieties that are directed to whole or partial exome capture, panel capture, targeted exon capture, anchored exome capture, or tiled genomic region capture.
  • the methods disclosed herein include an obtaining step that includes a sequencing reaction.
  • the sequencing reaction is a short read-length sequencing reaction or a long read-length sequencing reaction.
  • the sequencing reaction provides sequence information on less than 90%, less than 75%, or less than 50% of the starting genomic material.
  • the methods described herein further include linking two or more of the individual nucleic acid molecules in an inferred contig based upon overlapping sequences of the isolated fragments, wherein the inferred contig comprises a length N50 of at least 10 kb, 20 kb, 40 kb, 50 kb, 100 kb, or 200 kb.
  • the methods disclosed herein further include linking two or more of the individual nucleic acid molecules in a phase block based upon overlapping phased variants within the sequences of the isolated fragments, where the phase block comprises a length N50 of at least 10 kb, of at least 20 kb, of at least 40 kb, of at least 50 kb, of at least 100 kb or of at least 200 kb.
  • the methods disclosed herein provide sequence information from selected portions of the genome that together cover an exome.
  • the individual nucleic acid molecules in the discrete partitions include genomic DNA from a single cell.
  • the discrete partitions each include genomic DNA from a different chromosome.
  • the present disclosure provides a method of obtaining sequence information from one or more targeted portions of a genomic sample.
  • a method includes without limitation the steps of: (a) providing individual first nucleic acid fragment molecules of the genomic sample in discrete partitions; (b) fragmenting the individual first nucleic acid fragment molecules within the discrete partitions to create a plurality of second fragments from each of the individual first nucleic acid fragment molecules; (c) attaching a common barcode sequence to the plurality of the second fragments within a discrete partition, such that each of the plurality of second fragments are attributable to the discrete partition in which they are contained; (d) applying a library of probes directed to the one or more targeted portions of the genomic sample to the second fragments; (e) conducting a sequencing reaction to identify sequences of the plurality of second fragments that hybridized to the library of probes, thereby obtaining sequence information from the one or more targeted portions of the genomic sample.
  • the library of probes are attached to binding moieties, and before the conducting step (e), the second fragments are captured on a surface comprising capture moieties through a reaction between the binding moieties and the capture moieties.
  • the second fragments are amplified before or after the second fragments are captured on the surface.
  • the binding moieties comprise biotin and the capture moieties comprise streptavidin.
  • the sequencing reaction is a short read, high accuracy sequencing reaction.
  • the second fragments are amplified such that the resultant amplification products are capable of forming partial or complete hairpin structures.
  • the present disclosure provides methods for obtaining sequence information from one or more targeted portions of a genomic sample while retaining molecular context.
  • Such methods include the steps of: (a) providing starting genomic material; (b) distributing individual nucleic acid molecules from the starting genomic material into discrete partitions such that each discrete partition contains a first individual nucleic acid molecule; (c) fragmenting the first individual nucleic acid molecules in the discrete partitions to form a plurality of fragments; (d) providing a population enriched for fragments that include at least a portion of the one or more selected portions of the genome; (e) obtaining sequence information from the population, thereby sequencing one or more targeted portions of the genomic sample while retaining molecular context.
  • the plurality of fragments are tagged with a barcode to associate each fragment with the discrete partition in which it was formed.
  • the individual nucleic acid molecules in step (b) are distributed such that molecular context of each first individual nucleic acid molecule is maintained.
  • the present disclosure provides methods of obtaining sequence information from one or more targeted portions of a genomic sample.
  • Such methods include without limitation steps of (a) providing individual nucleic acid molecules of the genomic sample; (b) fragmenting the individual nucleic acid molecules to form a plurality of fragments, where each of the fragments further includes a barcode, and where fragments from the same individual nucleic molecule have a common barcode, thereby associating each fragment with the individual nucleic acid molecule from which it is derived; (c) enriching the plurality of fragments for fragments containing the one or more targeted portions of the genomic sample; and (d) conducting a sequencing reaction to identify sequences of the enriched plurality of fragments, thereby obtaining sequence information from the one or more targeted portions of the genomic sample.
  • the enriching step including applying a library of probes directed to the one or more targeted portions of the genomic sample.
  • the library of probes are attached to binding moieties, and prior to the conducting step, the fragments are captured through a reaction between the binding moieties and the capture moieties.
  • the reaction between the binding moieties and the capture moieties immobilizes the fragments on a surface.
  • FIG. 1 provides a schematic illustration of identification and analysis of targeted genomic regions using conventional processes versus the processes and systems described herein.
  • FIG. 2A and FIG. 2B provide schematic illustrations of identification and analysis of targeted genomic regions using processes and systems described herein.
  • FIG. 3 illustrates a typical workflow for performing an assay to detect sequence information, using the methods and compositions disclosed herein.
  • FIG. 4 provides a schematic illustration of a process for combining a nucleic acid sample with beads and partitioning the nucleic acids and beads into discrete droplets.
  • FIG. 5 provides a schematic illustration of a process for barcoding and amplification of chromosomal nucleic acid fragments.
  • FIG. 6 provides a schematic illustration of the use of barcoding of chromosomal nucleic acid fragments in attributing sequence data to individual chromosomes.
  • FIG. 7 illustrates a general embodiment of a method of the invention.
  • FIG. 8 illustrates a general embodiment of a method of the invention.
  • the practice of the present invention may employ, unless otherwise indicated, conventional techniques and descriptions of organic chemistry, polymer technology, molecular biology (including recombinant techniques), cell biology, biochemistry, and immunology, which are within the skill of the art.
  • Such conventional techniques include polymer array synthesis, hybridization, ligation, phage display, and detection of hybridization using a label.
  • Specific illustrations of suitable techniques can be had by reference to the example herein below. However, other equivalent conventional procedures can, of course, also be used.
  • Such conventional techniques and descriptions can be found in standard laboratory manuals such as Genome Analysis: A Laboratory Manual Series (Vols.
  • compositions and methods include the recited elements, but not excluding others.
  • Consisting essentially of when used to define compositions and methods, shall mean excluding other elements of any essential significance to the composition or method.
  • Consisting of shall mean excluding more than trace elements of other ingredients for claimed compositions and substantial method steps. Embodiments defined by each of these transition terms are within the scope of this invention. Accordingly, it is intended that the methods and compositions can include additional steps and components (comprising) or alternatively including steps and compositions of no significance (consisting essentially of) or alternatively, intending only the stated method steps or compositions (consisting of).
  • compositions and systems useful for characterization of genetic material provide methods, compositions and systems useful for characterization of genetic material.
  • the methods, compositions and systems described herein provide genetic characterization of targeted regions of a genome, including without limitation particular chromosomes, regions of chromosomes, all exons (exomes), portions of exomes, specific genes, panels of genes (e.g., kinomes or other targeted gene panels), intronic regions, tiled portions of a genome, or any other chosen portion of a genome.
  • the methods and systems described herein accomplish targeted genomic sequencing by providing for the determination of the sequence of long individual nucleic acid molecules and/or the identification of direct molecular linkage as between two sequence segments separated by long stretches of sequence, which permit the identification and use of long range sequence information, but this sequencing information is obtained using methods that have the advantages of the extremely low sequencing error rates and high throughput of short read sequencing technologies.
  • the methods and systems described herein segment long nucleic acid molecules into smaller fragments that can be sequenced using high-throughput, higher accuracy short-read sequencing technologies, and that segmentation is accomplished in a manner that allows the sequence information derived from the smaller fragments to retain the original long range molecular sequence context, i.e., allowing the attribution of shorter sequence reads to originating longer individual nucleic acid molecules.
  • By attributing sequence reads to an originating longer nucleic acid molecule one can gain significant characterization information for that longer nucleic acid sequence that one cannot generally obtain from short sequence reads alone.
  • This long range molecular context is not only preserved through a sequencing process, but is also preserved through the targeted enrichment process used in targeted sequencing approaches described herein, where no other sequencing approach has shown this ability.
  • sequence information from smaller fragments will retain the original long range molecular sequence context through the use of a tagging procedure, including the addition of barcodes as described herein and known in the art.
  • fragments originating from the same original longer individual nucleic acid molecule will be tagged with a common barcode, such that any later sequence reads from those fragments can be attributed to that originating longer individual nucleic acid molecule.
  • Such barcodes can be added using any method known in the art, including addition of barcode sequences during amplification methods that amplify segments of the individual nucleic acid molecules as well as insertion of barcodes into the original individual nucleic acid molecules using transposons, including methods such as those described in Amini et al., Nature Genetics 46: 1343-1349 (2014) (advance online publication on Oct. 29, 2014), which is hereby incorporated by reference in its entirety for all purposes and in particular for all teachings related to adding adaptor and other oligonucleotides using transposons.
  • the resultant tagged fragments can be enriched using methods described herein such that the population of fragments represents targeted regions of the genome.
  • sequence reads from that population allows for targeted sequencing of select regions of the genome, and those sequence reads can also be attributed to the originating nucleic acid molecules, thus preserving the original long range molecular sequence context.
  • sequence reads can be obtained using any sequencing methods and platforms known in the art and described herein.
  • the methods and systems described herein can also provide other characterizations of genomic material, including without limitation haplotype phasing, identification of structural variations, and identifying copy number variations, as described in co-pending applications U.S. Ser. Nos. 14/752,589 and 14/752,602, both filed on Jun. 26, 2015), which are herein incorporated by reference in their entirety for all purposes and in particular for all written description, figures and working examples directed to characterization of genomic material.
  • nucleic acids 102 and 104 are illustrated, each having a number of regions of interest, e.g., region 106 and 108 in nucleic acid 102 , and regions 110 and 112 in nucleic acid 104 .
  • the regions of interest in each nucleic acid are linked within the same nucleic acid molecule, but may be relatively separated from each other, e.g., more than 1 kb apart, more than 5 kb apart, more than 10 kb apart, more than 20 kb apart, more than 30 kb apart, more than 40 kb apart, more than 50 kb apart, and in some cases, as much as 100 kb apart.
  • the regions may denote individual genes, gene groups, exons, or simply discrete and separate parts of the genome. Solely for ease of discussion, the regions shown in FIG. 1 will be referred to as exons 106 , 108 , 110 and 112 .
  • each nucleic acid 102 and 104 is separated into its own partition 114 and 116 , respectively.
  • these partitions are, in many cases, aqueous droplets in a water in oil emulsion.
  • portions of each fragment are copied in a manner that preserves the original molecular context of those fragments, e.g., as having originated from the same molecule. As shown, this is achieved through the inclusion in each copied fragment of a barcode sequence, e.g., barcode sequence “1” or “2” as illustrated, that is representative of the droplet into which the originating fragment was partitioned.
  • target enrichment steps may be applied to the libraries of barcoded sequence fragments in order to “pull down” the sequences associated with the desired targets.
  • These may include exon targeted pull downs, gene panel specific targeted pull downs, or the like.
  • a large number of targeted pull down kits that allow for the enriched separation of specific targeted regions of the genome are commercially available, such as the Agilent SureSelect exome pull down kits, and the like.
  • application of a targeted enrichment results in enriched, barcoded sequence library 118 .
  • the pulled down fragments within library 118 retain their original molecular context, e.g., through the retention of the barcode information, they may be reassembled into their original molecular contexts with embedded long range linkage information, e.g., with inferred linkage as between each of the assembled regions of interest 106 : 108 and 110 : 112 .
  • one may identify direct molecular linkage between two disparate targeted portions of the genome, e.g., two or more exons, and that direct molecular linkage may be used to identify structural variations and other genomic characteristics, as well as to identify the phase information as to the two or more exons, e.g. providing phased exons, including potentially an entire phased exome, or other phased targeted portions of a genome.
  • methods of the invention include steps as illustrated in FIG. 7 , which provides a schematic overview of methods of the invention discussed in further detail herein.
  • FIG. 9 provides a schematic overview of methods of the invention discussed in further detail herein.
  • the method outlined in FIG. 9 is an exemplary embodiment that may be altered or modified as needed and as described herein.
  • each partition will include a single individual nucleic acid molecule from a particular locus that is then fragmented or copied in such a way as to preserve the original molecular context of the fragments ( 702 ), usually by barcoding the fragments that are specific to the partition in which they are contained.
  • Each partition may in some examples include more than one nucleic acid, and will in some instances contain several hundred nucleic acid molecules—in situations in which multiple nucleic acids are within a partition, any particular locus of the genome will generally be represented by a single individual nucleic acid prior to barcoding.
  • oligonucleotides are the samples within the distinct partitions. Such oligonucleotides may comprise random sequences intended to randomly prime numerous different regions of the samples, or they may comprise a specific primer sequence targeted to prime upstream of a targeted region of the sample. In further examples, these oligonucleotides also contain a barcode sequence, such that the replication process also barcodes the resultant replicated fragment of the original sample nucleic acid. A particularly elegant process for use of these barcode oligonucleotides in amplifying and barcoding samples is described in detail in U.S. patent application Ser. Nos.
  • Extension reaction reagents e.g., DNA polymerase, nucleoside triphosphates, co-factors (e.g., Mg 2+ or Mn 2+ etc.), that are also contained in the partitions, then extend the primer sequence using the sample as a template, to produce a complementary fragment to the strand of the template to which the primer annealed, and the complementary fragment includes the oligonucleotide and its associated barcode sequence.
  • Annealing and extension of multiple primers to different portions of the sample can result in a large pool of overlapping complementary fragments of the sample, each possessing its own barcode sequence indicative of the partition in which it was created.
  • these complementary fragments may themselves be used as a template primed by the oligonucleotides present in the partition to produce a complement of the complement that again, includes the barcode sequence.
  • this replication process is configured such that when the first complement is duplicated, it produces two complementary sequences at or near its termini to allow the formation of a hairpin structure or partial hairpin structure, which reduces the ability of the molecule to be the basis for producing further iterative copies.
  • the barcoded fragments are then pooled ( 703 ).
  • Target enrichment techniques can then be applied ( 704 ) to “pull down” the targeted regions of interest.
  • Those targeted regions of interest are then sequenced ( 705 ) and the sequences of the fragments are attributed to their originating molecular context ( 706 ), such that the targeted regions of interest are both identified and also linked with that originating molecular context.
  • a unique feature of the methods and systems described herein and illustrated in FIG. 7 is that barcodes are attached to the fragments ( 702 ) prior to the targeted enrichment step ( 704 ).
  • An advantage of the methods and systems described herein is that attaching a partition- or sample-specific barcode to the copied fragments prior to enriching the fragments for targeted genomic regions preserves the original molecular context of those targeted regions, allowing them to be attributed to their original partition and thus their originating sample nucleic acid.
  • targeted genomic regions are enriched, isolated or separated, i.e., “pulled down,” for further analysis, particularly sequencing, using methods that include both chip-based and solution-based capture methods.
  • Such methods utilize probes that are complementary to the genomic regions of interest or to regions near or adjacent to the genomic regions of interest.
  • hybrid (or chip-based) capture microarrays containing capture probes (usually single-stranded oligonucleotides) with sequences that taken together cover the region of interest are fixed to a surface.
  • Genomic DNA is fragmented and may further undergo processing such as end-repair to produce blunt ends and/or addition of additional features such as universal priming sequences. These fragments are hybridized to the probes on the microarray.
  • Unhybridized fragments are washed away and the desired fragments are eluted or otherwise processed on the surface for sequencing or other analysis, and thus the population of fragments remaining on the surface is enriched for fragments containing the targeted regions of interest (e.g., the regions comprising the sequences complementary to those contained in the capture probes).
  • the enriched population of fragments may further be amplified using any amplification technologies known in the art.
  • Additional methods of targeted genomic region capture include solution-based methods, in which genomic DNA fragments are hybridized to oligonucleotide probes.
  • the oligonucleotide probes are often referred to as “baits”.
  • These baits are generally attached to a capture molecule, including without limitation a biotin molecule.
  • the baits are complementary to targeted regions of the genome (or to regions near or adjacent to the targeted regions of interest), such that upon application to genomic DNA fragments, the baits hybridize to the fragments, and the capture molecule (e.g., biotin) is then used to selectively pull down the targeted regions of interest (for example, with magnetic streptavidin beads) to thereby enrich the resultant population of fragments with those containing the targeted regions of interest.
  • capture protocols can include any of those known in the art, including without limitation any of the exome capture protocols and kits produced by Roche/NimbleGen, Illumina, and Agilent.
  • Capture of targeted genomic regions for use in the methods and systems described herein are not limited to whole exomes, and can include any one or combination of partial exomes, genes, panels of genes, introns, and combinations of introns and exons.
  • the procedure for capture of these different types of targeted regions follows the general method of using baits to pull down fragments containing the targeted regions of interest.
  • the design of the baits, particularly the oligonucleotide probe portions of the baits that hybridize to or near to the targeted regions of interest, will in part depend on the type of targeted region to be captured.
  • the baits can be designed to capture that part of the exome.
  • the specific identities of the portions of the exome that are needed are known, and the library of baits comprises oligonucleotides that are complementary to those identified portions or to regions that are near or adjacent to those portions.
  • Such examples can further include without limitation capture of specific genes and/or panels of genes, or identified portions of the exome known to be associated with a particular phenotype, such as a disorder or disease.
  • the baits used can be subsets of a library directed to a whole genome, and that subset can be chosen randomly or through any kind of intelligent design in which the library of baits is selected or enriched for probes that are complementary to the targeted subsections of the genome or exome.
  • the targeted regions can be captured using baits that comprise oligonucleotide probes that are complementary to the whole or part of a targeted region, or the oligonucleotide probes may be complementary to another region, e.g., an intronic region, that is near the targeted region or adjacent to the targeted region.
  • a genomic sequence 201 comprises exonic regions 202 and 203 .
  • Those exonic regions can be captured by directing the baits to one or more of the intronic sequences nearby (for example intronic region 204 and/or 205 to capture exonic region 202 and intronic region 206 for capture of exonic region 203 ).
  • a population of fragments comprising exonic regions 202 or 203 can be captured through the use of baits complementary to intronic regions 204 and/or 205 and 206 .
  • the intronic region used as an intronic bait for the nearby exonic region can be adjacent to the exonic region of interest—i.e., there is no gap between the intronic region and the targeted exonic region.
  • the intronic region used to capture the nearby exonic region may be near enough so that both regions are likely to be in the same fragment, but there is a gap of one or more nucleotides between the exonic region and the intronic region (for example 202 and 205 in FIG. 2A ).
  • the baits are designed to be complementary to portions of the genome at particular ranges or distances.
  • the library of baits can be designed to cover sequences every 5 kilobases (kb) along the genome, such that applying this library of baits to a fragmented genomic sample will capture only a certain subset of the genome—i.e., those regions that are contained in fragments containing complementary sequences to the baits.
  • the baits can be designed based on a reference sequence, such as a human genome reference sequence.
  • the tiled library of baits is designed to capture regions every 1, 2, 5, 10, 15, 20, 25, 50, 100, 200, 250, 500, 750, 1000, or 10000 kilobases of a genome.
  • the tiled library of baits is designed to capture a mixture of distances—that mixture can be a random mixture of distances or intelligently designed such that a specific portion or percentage of the genome is captured.
  • tiling methods of capture will capture both intronic and exonic regions of the genome for further analysis such as sequencing. Any of the tiling or other intronic baiting methods described herein provide a way to link sequence information from exons widely separated by long intervening intronic regions.
  • the tiling or other capture methods described herein will capture about 5%, 10%, 15%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% of the whole genome. In still further examples, the capture methods described herein capture about 1-10%, 5-20%, 10-30%, 15-40%, 20-50%, 25-60%, 30-70%, 35-80%, 40-90%, or 45-95% of the whole genome.
  • sample preparation methods including methods of fragmenting, amplifying, partitioning, and otherwise processing genomic DNA, can lead to biases or lower coverage of certain regions of a genome.
  • biases or lowered coverage can be compensated for in the methods and systems disclosed herein by altering the concentration or genomic locations of baits used to capture targeted regions of the genome.
  • the library of baits can be altered to increase the concentration of baits directed to those regions of low coverage—in other words, the population of baits used may be “spiked” to ensure that a sufficient number of fragments containing targeted regions of the genome in those low coverage areas are obtained in the final population of fragments to be sequenced.
  • Such spiking of baits may be conducted in commercially available whole exome kits, such that a custom library of baits directed toward the lower coverage regions are added to off-the-shelf exome capture kits.
  • baits can be design to target a region of the genome that is very close to the region of interest, but has more favorable coverage, as is also discussed in further detail herein and embodiments of which are schematically illustrated in FIG. 2 .
  • the library of baits used in methods of the present invention is a product of informed design that fulfills one or more characteristics as further described herein.
  • This informed design includes instances in which the library of baits is directed to informative single nucleotide polymorphisms (SNPs).
  • SNPs single nucleotide polymorphisms
  • the term “informative SNPs” as used herein refers to SNPs that are heterozygous.
  • the library of baits in some examples is designed to contain a plurality of probes that are directed to regions of the genomic sample that contain informative SNPs. By “directed to” as used herein is meant that the probes contain sequences that are complementary to sequences that encompass the SNPs.
  • the library of baits is designed to contain probes directed to SNPs that are at predetermined distances from the boundary of an exon and an intron.
  • the library of baits includes probes that tile across such regions at a predetermined distance and/or that hybridize to the first informative SNP within the next nearest intron or exon.
  • An advantage of the methods and systems described herein is that the targeted regions that are captured are processed prior to capture in such a way that even after the steps of capturing the targeted regions and conducting sequencing analyses, the original molecular context of those targeted regions is retained.
  • the ability to attribute specific targeted regions to their original molecular context (which can include the original chromosome or chromosomal region from which they are derived and/or the location of particular targeted regions in relation to each other within the full genome) provides a way to obtain sequence information from regions of the genome that are otherwise poorly mapped or have poor coverage using traditional sequencing techniques.
  • nucleic acid molecule 207 contains two exons (shaded bars) interrupted by a long intronic region ( 208 ).
  • Generally used sequencing technologies would be unable to span the distance across the intron to provide information on the relationship of the two exons.
  • the individual nucleic acid molecule 207 is distributed into its own discrete partition 209 and then fragmented such that different fragments contain different portions of the exons and the intron. Because each of those fragments is tagged such that any sequence information obtained from the fragments is then attributable to the discrete partition in which it was generated, each fragment is thus also attributable to the individual nucleic acid molecule 207 from which it was derived.
  • fragments from different partitions are combined together. Targeted capture methods can then be used to enrich the population of fragments that undergoes further analysis, such as sequencing, with fragments containing the targeted region of interest. In the example illustrated in FIG.
  • the baits used will enrich the population of fragments to capture only those containing a portion of one of the two exons and/or part of the intervening intron, but regions outside of the exons and intron (such as 209 and 210 ) would not be captured.
  • regions outside of the exons and intron such as 209 and 210 .
  • Short read, high accuracy sequencing technologies can then be used to identify the sequences of this enriched population of fragments, and because each of the fragments is tagged and thus attributable to its original molecular context, i.e., its original individual nucleic acid molecule, the short read sequences can provide information that spans over the long length of the intervening intron to provide information on the relationship between the two exons.
  • individual molecular context refers to sequence context beyond the specific sequence read, e.g., relation to adjacent or proximal sequences, that are not included within the sequence read itself, and as such, will typically be such that they would not be included in whole or in part in a short sequence read, e.g., a read of about 150 bases, or about 300 bases for paired reads.
  • a short sequence read e.g., a read of about 150 bases, or about 300 bases for paired reads.
  • the methods and systems provide long range sequence context for short sequence reads.
  • Such long range context includes relationship or linkage of a given sequence read to sequence reads that are within a distance of each other of longer than 1 kb, longer than 5 kb, longer than 10 kb, longer than 15 kb, longer than 20 kb, longer than 30 kb, longer than 40 kb, longer than 50 kb, longer than 60 kb, longer than 70 kb, longer than 80 kb, longer than 90 kb or even longer than 100 kb, or longer.
  • one can also derive the phasing information of variants within that individual molecular context e.g., variants on a particular long molecule will be, by definition commonly phased.
  • Sequence context can include mapping or providing linkage of fragments across different (generally on the kilobase scale) ranges of full genomic sequence.
  • mapping the short sequence reads to the individual longer molecules or contigs of linked molecules as well as long range sequencing of large portions of the longer individual molecules, e.g., having contiguous determined sequences of individual molecules where such determined sequences are longer than 1 kb, longer than 5 kb, longer than 10 kb, longer than 15 kb, longer than 20 kb, longer than 30 kb, longer than 40 kb, longer than 50 kb, longer than 60 kb, longer than 70 kb, longer than 80 kb, longer than 90 kb or even longer than 100 kb.
  • the attribution of short sequences to longer nucleic acids may include both mapping of short sequences against longer nucleic acid stretches to provide high level sequence context, as well as providing assembled sequences from the short sequences through these longer nucleic acids.
  • long range sequence context associated with long individual molecules
  • having such long range sequence context also allows one to infer even longer range sequence context.
  • long range molecular context described above, one can identify overlapping variant portions, e.g., phased variants, translocated sequences, etc., among long sequences from different originating molecules, allowing the inferred linkage between those molecules.
  • inferred linkages or molecular contexts are referred to herein as “inferred contigs”.
  • phase blocks may represent commonly phased sequences, e.g., where by virtue of overlapping phased variants, one can infer a phased contig of substantially greater length than the individual originating molecules.
  • phase blocks are referred to herein as “phase blocks”.
  • inferred contig or phase blocks By starting with longer single molecule reads (e.g., the “long virtual single molecule reads” discussed above), one can derive longer inferred contigs or phase blocks than would otherwise be attainable using short read sequencing technologies or other approaches to phased sequencing. See, e.g., published U.S. Patent Application No. 2013-0157870.
  • N50 where the sum of the block lengths that are greater than the stated N50 number is 50% of the sum of all block lengths
  • inferred contig or phase block lengths having an N50 of at least about 100 kb, at least about 150 kb, at least about 200 kb, and in many cases, at least about 250 kb, at least about 300 kb, at least about 350 kb, at least about 400 kb, and in some cases, at least about 500 kb or more, are attained.
  • maximum phase block lengths in excess of 200 kb, in excess of 300 kb, in excess of 400 kb, in excess of 500 kb, in excess of 1 Mb, or even in excess of 2 Mb may be obtained.
  • the methods and systems described herein provide for the compartmentalization, depositing or partitioning of sample nucleic acids, or fragments thereof, into discrete compartments or partitions (referred to interchangeably herein as partitions), where each partition maintains separation of its own contents from the contents of other partitions.
  • Unique identifiers may be previously, subsequently or concurrently delivered to the partitions that hold the compartmentalized or partitioned sample nucleic acids, in order to allow for the later attribution of the characteristics, e.g., nucleic acid sequence information, to the sample nucleic acids included within a particular compartment, and particularly to relatively long stretches of contiguous sample nucleic acids that may be originally deposited into the partitions.
  • sample nucleic acids utilized in the methods described herein typically represent a number of overlapping portions of the overall sample to be analyzed, e.g., an entire chromosome, exome, or other large genomic portion. These sample nucleic acids may include whole genomes, individual chromosomes, exomes, amplicons, or any of a variety of different nucleic acids of interest.
  • the sample nucleic acids are typically partitioned such that the nucleic acids are present in the partitions in relatively long fragments or stretches of contiguous nucleic acid molecules.
  • these fragments of the sample nucleic acids may be longer than 1 kb, longer than 5 kb, longer than 10 kb, longer than 15 kb, longer than 20 kb, longer than 30 kb, longer than 40 kb, longer than 50 kb, longer than 60 kb, longer than 70 kb, longer than 80 kb, longer than 90 kb or even longer than 100 kb, which permits the longer range molecular context described above.
  • the sample nucleic acids are also typically partitioned at a level whereby a given partition has a very low probability of including two overlapping fragments of the starting sample nucleic acid. This is typically accomplished by providing the sample nucleic acid at a low input amount and/or concentration during the partitioning process. As a result, in preferred cases, a given partition may include a number of long, but non-overlapping fragments of the starting sample nucleic acids.
  • the sample nucleic acids in the different partitions are then associated with unique identifiers, where for any given partition, nucleic acids contained therein possess the same unique identifier, but where different partitions may include different unique identifiers.
  • the partitioning step allocates the sample components into very small volume partitions or droplets, it will be appreciated that in order to achieve the desired allocation as set forth above, one need not conduct substantial dilution of the sample, as would be required in higher volume processes, e.g., in tubes, or wells of a multiwell plate. Further, because the systems described herein employ such high levels of barcode diversity, one can allocate diverse barcodes among higher numbers of genomic equivalents, as provided above. In particular, previously described, multiwell plate approaches (see, e.g., U.S. Published Application No.
  • 2013-0079231 and 2013-0157870 typically only operate with a hundred to a few hundred different barcode sequences, and employ a limiting dilution process of their sample in order to be able to attribute barcodes to different cells/nucleic acids. As such, they will generally operate with far fewer than 100 cells, which would typically provide a ratio of genomes:(barcode type) on the order of 1:10, and certainly well above 1:100.
  • diverse barcode types can operate at genome:(barcode type) ratios that are on the order of 1:50 or less, 1:100 or less, 1:1000 or less, or even smaller ratios, while also allowing for loading higher numbers of genomes (e.g., on the order of greater than 100 genomes per assay, greater than 500 genomes per assay, 1000 genomes per assay, or even more) while still providing for far improved barcode diversity per genome.
  • the sample is combined with a set of oligonucleotide tags that are releasably-attached to beads prior to the partitioning step. That combination can then lead to barcoding of nucleic acids in the samples using methods known in the art and described herein.
  • amplification methods are used to add barcodes to the resultant amplification products, which in some examples contain smaller segments (fragments) of the full originating nucleic acid molecule from which they are derived.
  • methods using transposons are utilized as described in Amini et al, Nature Genetics 46: 1343-1349 (2014) (advance online publication on Oct.
  • methods of attaching barcodes can include the use of nicking enzymes or polymerases and/or invasive probes such as recA to produce gaps along double stranded sample nucleic acids—barcodes can then be inserted into those gaps.
  • the oligonucleotide tags may comprise at least a first and second region.
  • the first region may be a barcode region that, as between oligonucleotides within a given partition, may be substantially the same barcode sequence, but as between different partitions, may and, in most cases is a different barcode sequence.
  • the second region may be an N-mer (either a random N-mer or an N-mer designed to target a particular sequence) that can be used to prime the nucleic acids within the sample within the partitions.
  • the N-mer may be designed to target a particular chromosome (e.g., chromosome 1, 13, 18, or 21), or region of a chromosome, e.g., an exome or other targeted region.
  • the N-mer may be designed to target a particular gene or genetic region, such as a gene or region associated with a disease or disorder (e.g., cancer).
  • an amplification reaction may be conducted using the second N-mer to prime the nucleic acid sample at different places along the length of the nucleic acid.
  • each partition may contain amplified products of the nucleic acid that are attached to an identical or near-identical barcode, and that may represent overlapping, smaller fragments of the nucleic acids in each partition.
  • the bar-code can serve as a marker that signifies that a set of nucleic acids originated from the same partition, and thus potentially also originated from the same strand of nucleic acid.
  • the nucleic acids may be pooled, sequenced, and aligned using a sequencing algorithm.
  • shorter sequence reads may, by virtue of their associated barcode sequences, be aligned and attributed to a single, long fragment of the sample nucleic acid, all of the identified variants on that sequence can be attributed to a single originating fragment and single originating chromosome. Further, by aligning multiple co-located variants across multiple long fragments, one can further characterize that chromosomal contribution. Accordingly, conclusions regarding the phasing of particular genetic variants may then be drawn, as can analyses across long ranges of genomic sequence—for example, identification of sequence information across stretches of poorly characterized regions of the genome. Such information may also be useful for identifying haplotypes, which are generally a specified set of genetic variants that reside on the same nucleic acid strand or on different nucleic acid strands. Copy number variations may also be identified in this manner.
  • the described methods and systems provide significant advantages over current nucleic acid sequencing technologies and their associated sample preparation methods.
  • Ensemble sample preparation and sequencing methods are predisposed towards primarily identifying and characterizing the majority constituents in the sample, and are not designed to identify and characterize minority constituents, e.g., genetic material contributed by one chromosome, or by one or a few cells, or fragmented tumor cell DNA molecule circulating in the bloodstream, that constitute a small percentage of the total DNA in the extracted sample.
  • the described methods and systems also provide a significant advantage for detecting populations that are present within a larger sample.
  • the methods disclosed herein are also useful for providing sequence information over regions of the genome that are poorly characterized or are poorly represented in a population of nucleic acid targets due to biases introduced during sample preparation.
  • the use of the barcoding technique disclosed herein confers the unique capability of providing individual molecular context for a given set of genetic markers, i.e., attributing a given set of genetic markers (as opposed to a single marker) to individual sample nucleic acid molecules, and through variant coordinated assembly, to provide a broader or even longer range inferred individual molecular context, among multiple sample nucleic acid molecules, and/or to a specific chromosome.
  • These genetic markers may include specific genetic loci, e.g., variants, such as SNPs, or they may include short sequences.
  • the use of barcoding confers the additional advantages of facilitating the ability to discriminate between minority constituents and majority constituents of the total nucleic acid population extracted from the sample, e.g.
  • implementation in a microfluidics format confers the ability to work with extremely small sample volumes and low input quantities of DNA, as well as the ability to rapidly process large numbers of sample partitions (droplets) to facilitate genome-wide tagging.
  • an advantage of the methods and systems described herein is that they can achieve the desired results through the use of ubiquitously available, short read sequencing technologies.
  • Such technologies have the advantages of being readily available and widely dispersed within the research community, with protocols and reagent systems that are well characterized and highly effective.
  • These short read sequencing technologies include those available from, e.g., Illumina, inc. (GXII, NextSeq, MiSeq, HiSeq, X10), Ion Torrent division of Thermo-Fisher (Ion Proton and Ion PGM), pyrosequencing methods, as well as others.
  • the methods and systems described herein utilize these short read sequencing technologies and do so with their associated low error rates.
  • the methods and systems described herein achieve the desired individual molecular readlengths or context, as described above, but with individual sequencing reads, excluding mate pair extensions, that are shorter than 1000 bp, shorter than 500 bp, shorter than 300 bp, shorter than 200 bp, shorter than 150 bp or even shorter; and with sequencing error rates for such individual molecular readlengths that are less than 5%, less than 1%, less than 0.5%, less than 0.1%, less than 0.05%, less than 0.01%, less than 0.005%, or even less than 0.001%.
  • the methods and systems described in the disclosure provide for depositing or partitioning individual samples (e.g., nucleic acids) into discrete partitions, where each partition maintains separation of its own contents from the contents in other partitions.
  • the partitions refer to containers or vessels that may include a variety of different forms, e.g., wells, tubes, micro or nanowells, through holes, or the like. In preferred aspects, however, the partitions are flowable within fluid streams. These vessels may be comprised of, e.g., microcapsules or micro-vesicles that have an outer barrier surrounding an inner fluid center or core, or they may be a porous matrix that is capable of entraining and/or retaining materials within its matrix.
  • these partitions may comprise droplets of aqueous fluid within a non-aqueous continuous phase, e.g., an oil phase.
  • a non-aqueous continuous phase e.g., an oil phase.
  • a variety of different vessels are described in, for example, U.S. patent application Ser. No. 13/966,150, filed Aug. 13, 2013.
  • emulsion systems for creating stable droplets in non-aqueous or oil continuous phases are described in detail in, e.g., Published U.S. Patent Application No. 2010-0105112.
  • microfluidic channel networks are particularly suited for generating partitions as described herein. Examples of such microfluidic devices include those described in detail in U.S. patent application Ser. No. 14/682,952, filed Apr.
  • partitioning of sample materials into discrete partitions may generally be accomplished by flowing an aqueous, sample containing stream, into a junction into which is also flowing a non-aqueous stream of partitioning fluid, e.g., a fluorinated oil, such that aqueous droplets are created within the flowing stream partitioning fluid, where such droplets include the sample materials.
  • partitions e.g., droplets
  • the partitions also typically include co-partitioned barcode oligonucleotides.
  • the relative amount of sample materials within any particular partition may be adjusted by controlling a variety of different parameters of the system, including, for example, the concentration of sample in the aqueous stream, the flow rate of the aqueous stream and/or the non-aqueous stream, and the like.
  • the partitions described herein are often characterized by having extremely small volumes.
  • the droplets may have overall volumes that are less than 1000 pL, less than 900 pL, less than 800 pL, less than 700 pL, less than 600 pL, less than 500 pL, less than 400pL, less than 300 pL, less than 200 pL, less than 100 pL, less than 50 pL, less than 20 pL, less than 10 pL, or even less than 1 pL.
  • the sample fluid volume within the partitions may be less than 90% of the above described volumes, less than 80%, less than 70%, less than 60%, less than 50%, less than 40%, less than 30%, less than 20%, or even less than 10% the above described volumes.
  • the use of low reaction volume partitions is particularly advantageous in performing reactions with very small amounts of starting reagents, e.g., input nucleic acids.
  • the sample nucleic acids within partitions are generally provided with unique identifiers such that, upon characterization of those nucleic acids they may be attributed as having been derived from their respective origins. Accordingly, the sample nucleic acids are typically co-partitioned with the unique identifiers (e.g., barcode sequences).
  • the unique identifiers are provided in the form of oligonucleotides that comprise nucleic acid barcode sequences that may be attached to those samples.
  • the oligonucleotides are partitioned such that as between oligonucleotides in a given partition, the nucleic acid barcode sequences contained therein are the same, but as between different partitions, the oligonucleotides can, and preferably have differing barcode sequences. In preferred aspects, only one nucleic acid barcode sequence will be associated with a given partition, although in some cases, two or more different barcode sequences may be present.
  • the nucleic acid barcode sequences will typically include from 6 to about 20 or more nucleotides within the sequence of the oligonucleotides. These nucleotides may be completely contiguous, i.e., in a single stretch of adjacent nucleotides, or they may be separated into two or more separate subsequences that are separated by one or more nucleotides. Typically, separated subsequences may typically be from about 4 to about 16 nucleotides in length.
  • the co-partitioned oligonucleotides also typically comprise other functional sequences useful in the processing of the partitioned nucleic acids. These sequences include, e.g., targeted or random/universal amplification primer sequences for amplifying the genomic DNA from the individual nucleic acids within the partitions while attaching the associated barcode sequences, sequencing primers, hybridization or probing sequences, e.g., for identification of presence of the sequences, or for pulling down barcoded nucleic acids, or any of a number of other potential functional sequences.
  • sequences include, e.g., targeted or random/universal amplification primer sequences for amplifying the genomic DNA from the individual nucleic acids within the partitions while attaching the associated barcode sequences, sequencing primers, hybridization or probing sequences, e.g., for identification of presence of the sequences, or for pulling down barcoded nucleic acids, or any of a number of other potential functional sequences.
  • beads are provided that each may include large numbers of the above described oligonucleotides releasably attached to the beads, where all of the oligonucleotides attached to a particular bead may include the same nucleic acid barcode sequence, but where a large number of diverse barcode sequences may be represented across the population of beads used.
  • the population of beads may provide a diverse barcode sequence library that may include at least 1000 different barcode sequences, at least 10,000 different barcode sequences, at least 100,000 different barcode sequences, or in some cases, at least 1,000,000 different barcode sequences.
  • each bead may typically be provided with large numbers of oligonucleotide molecules attached.
  • the number of molecules of oligonucleotides including the barcode sequence on an individual bead may be at least bout 10,000 oligonucleotides, at least 100,000 oligonucleotide molecules, at least 1,000,000 oligonucleotide molecules, at least 100,000,000 oligonucleotide molecules, and in some cases at least 1 billion oligonucleotide molecules.
  • the oligonucleotides may be releasable from the beads upon the application of a particular stimulus to the beads.
  • the stimulus may be a photo-stimulus, e.g., through cleavage of a photo-labile linkage that may release the oligonucleotides.
  • a thermal stimulus may be used, where elevation of the temperature of the beads environment may result in cleavage of a linkage or other release of the oligonucleotides form the beads.
  • a chemical stimulus may be used that cleaves a linkage of the oligonucleotides to the beads, or otherwise may result in release of the oligonucleotides from the beads.
  • the beads including the attached oligonucleotides may be co-partitioned with the individual samples, such that a single bead and a single sample are contained within an individual partition.
  • the flows and channel architectures are controlled as to ensure a desired number of singly occupied partitions, less than a certain level of unoccupied partitions and less than a certain level of multiply occupied partitions.
  • FIG. 3 illustrates one particular example method for barcoding and subsequently sequencing a sample nucleic acid, particularly for use for a copy number variation or haplotype assay.
  • a sample comprising nucleic acid may be obtained from a source, 300 , and a set of barcoded beads may also be obtained, 310 .
  • the beads are preferably linked to oligonucleotides containing one or more barcode sequences, as well as a primer, such as a random N-mer or other primer.
  • the barcode sequences are releasable from the barcoded beads, e.g., through cleavage of a linkage between the barcode and the bead or through degradation of the underlying bead to release the barcode, or a combination of the two.
  • the barcoded beads can be degraded or dissolved by an agent, such as a reducing agent to release the barcode sequences.
  • an agent such as a reducing agent to release the barcode sequences.
  • a low quantity of the sample comprising nucleic acid, 305 , barcoded beads, 315 , and optionally other reagents, e.g., a reducing agent, 320 are combined and subject to partitioning.
  • such partitioning may involve introducing the components to a droplet generation system, such as a microfluidic device, 325 .
  • a droplet generation system such as a microfluidic device, 325 .
  • a water-in-oil emulsion 330 may be formed, wherein the emulsion contains aqueous droplets that contain sample nucleic acid, 305 , reducing agent, 320 , and barcoded beads, 315 .
  • the reducing agent may dissolve or degrade the barcoded beads, thereby releasing the oligonucleotides with the barcodes and random N-mers from the beads within the droplets, 335 .
  • the random N-mers may then prime different regions of the sample nucleic acid, resulting in amplified copies of the sample after amplification, wherein each copy is tagged with a barcode sequence, 340 .
  • each droplet contains a set of oligonucleotides that contain identical barcode sequences and different random N-mer sequences.
  • additional sequences e.g., sequences that aid in particular sequencing methods, additional barcodes, etc.
  • sequences e.g., sequences that aid in particular sequencing methods, additional barcodes, etc.
  • sequences e.g., sequences that aid in particular sequencing methods, additional barcodes, etc.
  • Sequencing may then be performed, 355 , and an algorithm applied to interpret the sequencing data, 360 .
  • Sequencing algorithms are generally capable, for example, of performing analysis of barcodes to align sequencing reads and/or identify the sample from which a particular sequence read belongs. In addition, and as is described herein, these algorithms may also further be used to attribute the sequences of the copies to their originating molecular context.
  • FIG. 4 An example of a microfluidic channel structure for co-partitioning samples and beads comprising barcode oligonucleotides is schematically illustrated in FIG. 4 . As shown, channel segments 402 , 404 , 406 , 408 and 410 are provided in fluid communication at channel junction 412 . An aqueous stream comprising the individual samples 414 is flowed through channel segment 402 toward channel junction 412 . As described elsewhere herein, these samples may be suspended within an aqueous fluid prior to the partitioning process.
  • an aqueous stream comprising the barcode carrying beads 416 is flowed through channel segment 404 toward channel junction 412 .
  • a non-aqueous partitioning fluid is introduced into channel junction 412 from each of side channels 406 and 408 , and the combined streams are flowed into outlet channel 410 .
  • the two combined aqueous streams from channel segments 402 and 404 are combined, and partitioned into droplets 418 , that include co-partitioned samples 414 and beads 416 .
  • each of the fluids combining at channel junction 412 can optimize the combination and partitioning to achieve a desired occupancy level of beads, samples or both, within the partitions 418 that are generated.
  • reagents may be co-partitioned along with the samples and beads, including, for example, chemical stimuli, nucleic acid extension, transcription, and/or amplification reagents such as polymerases, reverse transcriptases, nucleoside triphosphates or NTP analogues, primer sequences and additional cofactors such as divalent metal ions used in such reactions, ligation reaction reagents, such as ligase enzymes and ligation sequences, dyes, labels, or other tagging reagents.
  • chemical stimuli such as nucleic acid extension, transcription, and/or amplification reagents such as polymerases, reverse transcriptases, nucleoside triphosphates or NTP analogues, primer sequences and additional cofactors such as divalent metal ions used in such reactions, ligation reaction reagents, such as ligase enzymes and ligation sequences, dyes, labels, or other tagging reagents.
  • nucleic acid extension such as
  • the oligonucleotides disposed upon the bead may be used to barcode and amplify the partitioned samples.
  • a particularly elegant process for use of these barcode oligonucleotides in amplifying and barcoding samples is described in detail in U.S. patent application Ser. Nos. 14/316,383, 14/316,398, 14/316,416, 14/316,431, 14/316,447, 14/316,463, all filed Jun. 26, 2014, the full disclosures of which are hereby incorporated by reference in their entireties.
  • the oligonucleotides present on the beads that are co-partitioned with the samples and released from their beads into the partition with the samples.
  • the oligonucleotides typically include, along with the barcode sequence, a primer sequence at its 5′ end.
  • This primer sequence may be random or structured. Random primer sequences are generally intended to randomly prime numerous different regions of the samples. Structured primer sequences can include a range of different structures including defined sequences targeted to prime upstream of a specific targeted region of the sample as well as primers that have some sort of partially defined structure, including without limitation primers containing a percentage of specific bases (such as a percentage of GC N-mers), primers containing partially or wholly degenerate sequences, and/or primers containing sequences that are partially random and partially structured in accordance with any of the description herein. As will be appreciated, any one or more of the above types of random and structured primers may be included in oligonucleotides in any combination.
  • the primer portion of the oligonucleotide can anneal to a complementary region of the sample.
  • Extension reaction reagents e.g., DNA polymerase, nucleoside triphosphates, co-factors (e.g., Mg2+ or Mn2+ etc.), that are also co-partitioned with the samples and beads, then extend the primer sequence using the sample as a template, to produce a complementary fragment to the strand of the template to which the primer annealed, with complementary fragment includes the oligonucleotide and its associated barcode sequence.
  • Annealing and extension of multiple primers to different portions of the sample may result in a large pool of overlapping complementary fragments of the sample, each possessing its own barcode sequence indicative of the partition in which it was created.
  • these complementary fragments may themselves be used as a template primed by the oligonucleotides present in the partition to produce a complement of the complement that again, includes the barcode sequence.
  • this replication process is configured such that when the first complement is duplicated, it produces two complementary sequences at or near its termini, to allow the formation of a hairpin structure or partial hairpin structure, which reduces the ability of the molecule to be the basis for producing further iterative copies. A schematic illustration of one example of this is shown in FIG. 5 .
  • oligonucleotides that include a barcode sequence are co-partitioned in, e.g., a droplet 502 in an emulsion, along with a sample nucleic acid 504 .
  • the oligonucleotides 508 may be provided on a bead 506 that is co-partitioned with the sample nucleic acid 504 , which oligonucleotides are preferably releasable from the bead 506 , as shown in panel A.
  • the oligonucleotides 508 include a barcode sequence 512 , in addition to one or more functional sequences, e.g., sequences 510 , 514 and 516 .
  • oligonucleotide 508 is shown as comprising barcode sequence 512 , as well as sequence 510 that may function as an attachment or immobilization sequence for a given sequencing system, e.g., a P5 sequence used for attachment in flow cells of an Illumina Hiseq or Miseq system.
  • the oligonucleotides also include a primer sequence 516 , which may include a random or targeted N-mer for priming replication of portions of the sample nucleic acid 504 .
  • oligonucleotide 508 Also included within oligonucleotide 508 is a sequence 514 which may provide a sequencing priming region, such as a “read1” or R1 priming region, that is used to prime polymerase mediated, template directed sequencing by synthesis reactions in sequencing systems.
  • a sequencing priming region such as a “read1” or R1 priming region
  • the barcode sequence 512 , immobilization sequence 510 and R1 sequence 514 may be common to all of the oligonucleotides attached to a given bead.
  • the primer sequence 516 may vary for random N-mer primers, or may be common to the oligonucleotides on a given bead for certain targeted applications.
  • the oligonucleotides are able to prime the sample nucleic acid as shown in panel B, which allows for extension of the oligonucleotides 508 and 508 a using polymerase enzymes and other extension reagents also co-portioned with the bead 506 and sample nucleic acid 504 .
  • panel C following extension of the oligonucleotides that, for random N-mer primers, would anneal to multiple different regions of the sample nucleic acid 504 ; multiple overlapping complements or fragments of the nucleic acid are created, e.g., fragments 518 and 520 .
  • sequence portions that are complementary to portions of sample nucleic acid e.g., sequences 522 and 524
  • these constructs are generally referred to herein as comprising fragments of the sample nucleic acid 504 , having the attached barcode sequences.
  • the replicated portions of the template sequences as described above are often referred to herein as “fragments” of that template sequence.
  • fragment encompasses any representation of a portion of the originating nucleic acid sequence, e.g., a template or sample nucleic acid, including those created by other mechanisms of providing portions of the template sequence, such as actual fragmentation of a given molecule of sequence, e.g., through enzymatic, chemical or mechanical fragmentation.
  • fragments of a template or sample nucleic acid sequence will denote replicated portions of the underlying sequence or complements thereof.
  • the barcoded nucleic acid fragments may then be subjected to characterization, e.g., through sequence analysis, or they may be further amplified in the process, as shown in panel D.
  • additional oligonucleotides e.g., oligonucleotide 508 b , also released from bead 306 , may prime the fragments 518 and 520 .
  • the oligonucleotide anneals with the fragment 518 , and is extended to create a complement 526 to at least a portion of fragment 518 which includes sequence 528 , that comprises a duplicate of a portion of the sample nucleic acid sequence. Extension of the oligonucleotide 508 b continues until it has replicated through the oligonucleotide portion 508 of fragment 518 .
  • the oligonucleotides may be configured to prompt a stop in the replication by the polymerase at a desired point, e.g., after replicating through sequences 516 and 514 of oligonucleotide 508 that is included within fragment 518 .
  • this may be accomplished by different methods, including, for example, the incorporation of different nucleotides and/or nucleotide analogues that are not capable of being processed by the polymerase enzyme used.
  • this may include the inclusion of uracil containing nucleotides within the sequence region 512 to prevent a non-uracil tolerant polymerase to cease replication of that region.
  • a fragment 526 is created that includes the full-length oligonucleotide 508 b at one end, including the barcode sequence 512 , the attachment sequence 510 , the R1 primer region 514 , and the random N-mer sequence 516 b .
  • the complement 516 ′ to the random N-mer of the first oligonucleotide 508 will be included, as well as a complement to all or a portion of the R1 sequence, shown as sequence 514 ′.
  • the R1 sequence 514 and its complement 514 ′ are then able to hybridize together to form a partial hairpin structure 528 .
  • sequence 516 ′ which is the complement to random N-mer 516
  • sequence 516 b which is the complement to random N-mer 516
  • the N-mers would be common among oligonucleotides within a given partition.
  • partial hairpin structures By forming these partial hairpin structures, it allows for the removal of first level duplicates of the sample sequence from further replication, e.g., preventing iterative copying of copies.
  • the partial hairpin structure also provides a useful structure for subsequent processing of the created fragments, e.g., fragment 526 .
  • a nucleic acid 604 originated from a first source 600 (e.g., individual chromosome, strand of nucleic acid, etc.) and a nucleic acid 606 derived from a different chromosome 602 or strand of nucleic acid are each partitioned along with their own sets of barcode oligonucleotides as described above.
  • a first source 600 e.g., individual chromosome, strand of nucleic acid, etc.
  • a nucleic acid 606 derived from a different chromosome 602 or strand of nucleic acid are each partitioned along with their own sets of barcode oligonucleotides as described above.
  • each nucleic acid 604 and 606 is then processed to separately provide overlapping set of second fragments of the first fragment(s), e.g., second fragment sets 608 and 610 .
  • This processing also provides the second fragments with a barcode sequence that is the same for each of the second fragments derived from a particular first fragment.
  • the barcode sequence for second fragment set 608 is denoted by “1” while the barcode sequence for fragment set 610 is denoted by “2”.
  • a diverse library of barcodes may be used to differentially barcode large numbers of different fragment sets. However, it is not necessary for every second fragment set from a different first fragment to be barcoded with different barcode sequences. In fact, in many cases, multiple different first fragments may be processed concurrently to include the same barcode sequence. Diverse barcode libraries are described in detail elsewhere herein.
  • the barcoded fragments may then be pooled for sequencing using, for example, sequence by synthesis technologies available from Illumina or Ion Torrent division of Thermo Fisher, Inc.
  • sequence reads 612 can be attributed to their respective fragment set, e.g., as shown in aggregated reads 614 and 616 , at least in part based upon the included barcodes, and optionally, and preferably, in part based upon the sequence of the fragment itself.
  • the attributed sequence reads for each fragment set are then assembled to provide the assembled sequence for each sample fragment, e.g., sequences 618 and 620 , which in turn, may be further attributed back to their respective original chromosomes ( 600 and 602 ).
  • Methods and systems for assembling genomic sequences are described in, for example, U.S. patent application Ser. No. 14/752,773, filed Jun. 26, 2015, the full disclosure of which is hereby incorporated by reference in its entirety.
  • targeted regions of a genome is meant a whole genome or any one or more regions of a genome identified as of interest and/or selected through one or more methods described herein.
  • the targeted regions of the genome sequenced by methods and systems described herein include without limitation introns, exons, intergenic regions, or any combination thereof.
  • the methods and systems described herein provide sequence information on whole exomes, portions of exomes, one or more selected genes (including selected panels of genes), one or more introns, and combinations of intronic and exonic sequences.
  • Targeted regions of the genome may also include certain portions or percentages of the genome rather than regions identified by sequence.
  • targeted regions of the genome captured and analyzed in accordance with the methods described herein include portions of the genome located every 1, 2, 5, 10, 15, 20, 25, 50, 100, 200, 250, 500, 750, 1000, or 10000 kilobases of a genome.
  • targeted regions of the genome comprise 5%, 10%, 15%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% of the whole genome.
  • the targeted regions comprise 1-10%, 5-20%, 10-30%, 15-40%, 20-50%, 25-60%, 30-70%, 35-80%, 40-90%, or 45-95% of the whole genome.
  • targeted regions of a genome are captured for use in any sequencing methods known in the art and described herein.
  • captured as used herein is meant any method or system for enriching a population of nucleic acid and/or nucleic acid fragments such that the resultant population contains an increased percentage of the targeted regions of interest as compared to the genomic regions that are not of interest.
  • the enriched population contains at least 50%, 55%, 60%, 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99%, or 100% nucleic acids/nucleic acid fragments comprising the targeted regions.
  • Capture methods generally include chip-based methods, in which targeted regions are captured through hybridization or other association with capture molecules on a surface, and solution based methods, in which oligonucleotide probes (baits), which are complementary to the targeted regions (or to regions near the targeted regions) are hybridized to genomic fragment libraries.
  • the probes used in the capture methods disclosed herein are generally attached to capture molecules, such as biotin, which can be used to “pull down” the probes and the fragments to which they are hybridized—these pull down methods include any methods by which the baits hybridized to nucleic acids or nucleic acid fragments that contain the targeted regions of interest are separated from fragments that do not contain the regions of interest.
  • the probes are biotynilated
  • magnetic streptavidin beads are used to selectively pull-down and enrich baits with bound targeted regions.
  • a library of baits is used that covers all the targeted regions desired for further study.
  • a library of baits thus includes oligonucleotide probes that together cover the full exome.
  • only portions of the exome are needed for further analysis.
  • the baits are designed to target that subset of the exome. This design can be accomplished using methods and algorithms known in the art and in general is based upon a reference sequence, such as the human genome.
  • the targeted genomic regions processed and sequenced in accordance with the methods and systems described herein are full or partial exomes.
  • These full or partial exomes can be captured for sequencing using any methods known in the art, including without limitation any of the Roche/NimbleGen exome protocols, including the NimbleGen 2.1M Human Exome array and the NimbleGen SeqCap EZ Exome Library, any of the Agilent SureSelect products, any Illumina exome capture products, including the TruSeq and Nextera Exome products, and any other products, methods, systems and protocols known in the art.
  • the baits used to capture those targeted regions may be designed to be complementary to those exonic sequences.
  • the baits are not complementary to the exonic sequences themselves but are instead complementary to sequences near the exonic sequence or to intronic sequences between two exons.
  • Such designs are also referred to herein as “anchored exome capture” or “intronic baiting,” by which, as discussed herein, is meant a process in which one or more portions of an exome are captured through the use of baits complementary to one or more intronic sequences near or adjacent to the one or more portions of the exome that are of interest. For example, as schematically illustrated in FIG.
  • a genomic sequence 201 comprises exonic regions 202 and 203 .
  • Those exonic regions can be captured by utilizing baits directed to one or more of the intronic sequences nearby (for example intronic region 204 and/or 205 to capture exonic region 202 and intronic region 206 for capture of exonic region 203 ).
  • baits directed to one or more of the intronic sequences nearby (for example intronic region 204 and/or 205 to capture exonic region 202 and intronic region 206 for capture of exonic region 203 ).
  • a population of fragments comprising exonic regions 202 or 203 would be captured through the use of baits complementary to intronic regions 204 and/or 205 and 206 .
  • intronic baiting is used to bridge exons separated by long intronic regions by sparsely baiting longer introns.
  • the baits are not necessarily targeting intronic regions that are close to the exonic regions of interest, but the baits are instead designed to target regions separated by particular distances (or sets of distances) or are designed to tile across the intronic regions by a particular number of bases or combinations of numbers of bases. Such embodiments are described in further detail below.
  • the intronic regions used for anchored exome capture/intronic baiting techniques of the invention are adjacent to the exonic region to be captured.
  • the intronic regions are separated from the exonic region to be captured by about 1-50, 2-45, 3-40, 4-35, 5-30, 6-25, 7-20, 8-15, 9-10, 2-20, 3-15, 4-10, 5-30, 10-40, 15-50, 20-75, 25-100 nucleotides.
  • the intronic regions are separated from the exonic regions to be captured by about 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200, 300, 400, or 500 nucleotides.
  • the intronic regions are separated from the exonic regions to be captured by distances on the orders of kilobases, e.g., 1-20, 2-18, 3-16, 4-14, 5-12, 6-10 kilobases. Since the original molecular context of the enriched population of oligonucleotides is retained, this sparse baiting of intronic regions allows for the linking of sequence information between exonic regions separated by long introns.
  • the baits are instead designed to be complementary to portions of the genome at particular ranges or distances.
  • the library of baits can be designed to hybridize to sequences located every 5 kilobases (kb) along the genome, such that applying this library of baits to a fragmented genomic sample will capture only a certain subset of the genome—i.e., those regions that are contained in fragments containing complementary sequences to the baits.
  • the baits can be designed based on a reference sequence, such as a human genome reference sequence.
  • the tiled library of baits is designed to capture regions every 1, 2, 5, 10, 15, 20, 25, 50, 100, 200, 250, 500, 750, 1000, or 10000 kilobases of a genome.
  • this tiling method has the effect of sparsely capturing intronic regions, thus providing a way to link sequence information of exonic regions that are separated by long intronic regions, because the original molecular context of those exonic regions captured through sparse capture of intronic regions is retained.
  • the baits are designed to tile the genome in a random or combined manner—for example, a mixture of tiled libraries can be used where some of the libraries capture regions every 1 kb, whereas other libraries in the mixture capture regions every 100 kb.
  • the tiled libraries are designed so that the baits target within a range of positions within the genome—for example, the baits may target regions of every 1-10, 2-5, 5-200, 10-175, 15-150, 20-125, 30-100, 40-75, 50-60 kb of the genome.
  • the tiled or other capture methods described herein will capture about 5%, 10%, 15%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% of the whole genome. As will be appreciated, such tiling methods of capture will capture both intronic and exonic regions of the genome for further analysis such as sequencing.
  • the library of baits used in methods of the present invention is a product of informed design that fulfills one or more characteristics as further described herein.
  • This informed design includes instances in which the library of baits is directed to informative single nucleotide polymorphisms (SNPs).
  • SNPs single nucleotide polymorphisms
  • the term “informative SNPs” as used herein refers to SNPs that are heterozygous.
  • the library of baits in some examples is designed to contain a plurality of probes that are directed to regions of the genomic sample that contain informative SNPs.
  • directed to as used herein is meant that the probes contain sequences that are complementary to those regions of the genomic sequences.
  • Informed bait design provides the ability to optimize targeted sequencing methods by allowing for targeted enrichment with full coverage while at the same time reducing the number of probes needed (and thus reducing costs and streamlining the work flow).
  • the libraries of baits are designed to include baits directed to particular sequences in targeted regions of the genome based on the presence or absence of informative SNPs in those regions and/or the location(s) of those informative SNPs.
  • An exemplary illustration of general considerations for informed bait design is provided in FIG. 8 .
  • a region of the genome 801 can include exons ( 802 and 803 ).
  • an informative SNP 804 will be located at the boundary between the exon ( 802 ) and the adjacent intron.
  • the bait library can be designed to include probes directed to one or more nucleotides ( 805 ) at a specified distance away from the boundary.
  • the bait library can be designed to include probes directed to one or more positions in the intron near that boundary ( 807 and 808 ). Those positions will preferably include informative SNPs, but may also include other SNPs and/or other sequences as needed.
  • the bait library can be designed to include probes directed to several positions 810 , 811 , and 812 in the adjacent intron that include a mixture of informative and non-informative SNPs (as well as any other sequences as needed).
  • one or more input characteristics are used to design a probe bait library that is directed to shifting locations along the genome based on those input characteristics as well as map quality in various regions.
  • This design is generally based on spacing between informative SNPs rather than on the locations of introns and exons.
  • any of the descriptions provided herein related to bait design based on intron and exon locations can also be used in combination with the informed bait design methods based on informative SNPs.
  • Input characteristics used in informed bait design include without limitation and in any combination locations of exons, introns, intergenic regions, informative SNPs, as well as regions of repeating sequences (such as GC-rich regions), centromeres, and sample nucleic acid lengths.
  • probe bait libraries are designed to include probes directed to regions that have a high likelihood of containing informative SNPs in a given sample.
  • targets may include individual bases (the informative SNPs themselves) or one or more bases that are proximal or adjacent to the informative SNPs.
  • the targets for the probe baits may be directly adjacent to the informative SNPs or separated by distances from about 1-200, 10-190, 20-180, 30-170, 40-160, 50-150, 60-140, 70-130, 80-120, 90-100 bases from an informative SNP.
  • the probe bait libraries include probes directed to regions of particular densities related to the average length of the nucleic acid molecules.
  • the probes can be designed to include probes at a density of target sequences that is x-fold more dense than the average length of the nucleic acid molecules/fragments to which the probes are hybridizing, where x can be without limitation 1, 5, 10, 20, 50, 75, 100, 125, 150, or 200.
  • Increasing the density of the probe targets relative to the length of the nucleic acids increases the ability to link probes across loci on the same physical molecule.
  • Such methods can also improve the probability that the linked regions will include informative SNPs, thus further improving the ability of the probe bait libraries to attach to targeted regions of the genome.
  • the density of the probe targets may also be increased in situations in which (at the population level) there is not a high probability of informative SNPs in a given region of interest. In such regions, tiling methods such as those described herein can be used to direct probes at periodic spacings along the region. In certain embodiments, the density of the spacing can be differentially based, such that the density of probe spacing in these regions lacking informative SNPs are at a 1, 2, 5, 10, 25, 50-fold shorter distance than probe spacing in regions containing informative SNPs.
  • the probe bait library is designed to consider only informative SNP distribution within a gene (including exons and introns).
  • This method of design is directed to capture a sufficient number of heterozygous SNPs at key locations to link/phase from one end of the gene to the other.
  • Such a design method includes baits directed to sets of targets that combine exonic informative SNPs with one or more non-exonic SNPs such that the distance between informative SNPs in a gene is below the above described densities of spacing.
  • Such informed design methods allow detection of not only general targeted regions of the genome, but also allows the detection and phasing of genomic structural variations, such as translocations and gene fusions. By ensuring that any individual gene can be phased, it follows that the vast majority of gene fusion events can be detected and phased using the methods described herein.
  • the bait libraries are designed to target probes at distances of about 1 kb to about 2 Mb. In further embodiments, the distances are from about 1-50, 5-45, 10-40, 15-35, 20-30, 10-50 kb.
  • the nucleic acid fragments being targeted by the probe baits are from about 2 kb to about 250 Mb. In still further embodiments, the fragments are from about 10-1000, 20-900, 30-800, 40-700, 50-600, 60-500, 70-400, 80-300, 90-200, 100-150, 50-500, 25-300 kb.
  • the probe bait libraries are designed such that about 60-95% of the probes hybridize to sequences containing informative SNPs. In further embodiments, the probe bait libraries are designed such that about 65%-85%, 70%-80%, 60-90%, 80-90%, 90-95%, 95%-99% of the probes in the library of probes are designed to hybridize to informative SNPs. In still further embodiments, at least 65%, 75%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97% of the probes in the library of probes are designed to hybridize to informative SNPs. As will be appreciated, for a probe to be designed to “hybridize to” an informative SNP means that such a probe hybridizes to a sequence region that includes that informative SNP.
  • the probe bait libraries are designed to include a plurality of probes directed to informative SNPs that are located within both exons and introns in targeted portions of the genomic sample.
  • the libraries are designed such that a majority of the probes in the library hybridize to informative SNPs spaced apart by about 1-15, 5-10, 3-6 kb. In yet further embodiments, the majority of the probes in the library of probes are further designed to hybridize to informative SNPs spaced apart by about 1, 3, 5, 10, 20, 30, 50 kb.
  • a plurality of probes within the library of probes are designed such that for targeted portions of the genomic samples in which there are no informative SNPs within 5-300, 10-50, 20-100, 30-150, or 40-200 kb of boundaries between exons and introns, the plurality of probes is designed to hybridize at an informative SNP within an intron from those boundaries.
  • a plurality of probes within the library of probes are designed such that for targeted portions of the genomic samples in which there is a first informative SNP within an exon and that first informative SNP is located 5-300, 10-50, 20-100, 30-150, or 40-200 kb from a boundary with an adjacent intron and a second informative SNP within the adjacent intron and that second informative SNP is located 10-50 kb from the boundary, the plurality of probes is designed to hybridize to a region of the genomic sample between the first and second informative SNPs;
  • a plurality of probes within the library of probes are designed such that for targeted portions of the genomic samples comprising no informative SNPs for at least 5-300, 10-50, 20-100, 30-150, or 40-200 kb, the plurality of probes is designed to hybridize every 0.5, 1, 3, or 5 kb to those targeted portions of the genomic samples. In further embodiments, the plurality of probes is designed to hybridize every 0.1, 0.5, 1, 1.5, 3, 5, 10, 15, 20, 30, 35, 40, 45, 50 kb along those targeted portions of the genomic samples.
  • a plurality of probes within the library of probes are designed such that for targeted portions of the genomic samples in which there are no informative SNPs within 5-300, 10-50, 20-100, 30-150, or 40-200 kb of boundaries between exons and introns, the plurality of probes are designed to hybridize to the next closest informative SNP to the exon-intron boundaries.
  • the library of probes comprises probes designed to hybridize to regions of the genomic sample that flank exons at a density that provides linkage information across barcodes.
  • the range of coverage represented by the library of probes is inversely proportional to the distribution of lengths of the individual nucleic acid fragment molecules of the genomic sample in the discrete partitions, such that methods containing a higher proportion of longer individual nucleic acid fragment molecules use libraries of probes with smaller ranges of coverage.
  • the library of probes is optimized for coverage of the targeted portions of the genomic sample.
  • the density of coverage may be lower for regions of high map quality, particularly for those regions containing informative SNPs, and the density may further be higher for regions of low map quality to ensure that linkage information is provided across targeted regions.
  • the library of probes has features informed by characteristics of the one or more targeted portions of a genomic sample, such that for targeted portions with high map quality, the library of probes comprises probes that hybridize to informative SNPs within 1 kb-1 Mb of boundaries of exons and introns.
  • the library of probes may in such situations further include probes that hybridize to informative SNPs within 10-500, 20-450, 30-400, 40-350, 50-300, 60-250, 70-200, 80-150, 90-100 kb of boundaries of exons and introns.
  • the library of probes has features informed by characteristics of the one or more targeted portions of a genomic sample, such that for targeted portions in which the distribution of lengths of the barcoded fragments has a high proportion of fragments longer than about 100, 150, 200, 250 kb, the library of probes comprise probes that hybridize to informative SNPs separated by at least 50 kb.
  • the library of probes may in such situations further include probes that hybridize to informative SNPs separated by at least 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 75, 100, 125, 150, 175, 200 kb.
  • the library of probes has features informed by characteristics of the one or more targeted portions of a genomic sample, such that for targeted portions with low map quality, the library of probes comprises probes that hybridize to informative SNPs within 1 kb of exon-intron boundaries.
  • the library of probes may in such situations further include probes that hybridize to informative SNPs within 2, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 75, 100, 125, 150, 175, 200 kb of exon-intron boundaries.
  • the library will further include probes that hybridize and probes that hybridize to informative SNPs within exons, within introns, or both.
  • the library of probes has features informed by characteristics of the one or more targeted portions of a genomic sample, such that for targeted portions comprising intergenic regions, the library of probes comprises probes that hybridize to informative SNPs spaced apart at distances of at least 1, 2, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 75, 100 kb.
  • the baits used in the capture methods described herein can be of any size or structure that is useful for enriching a population of fragments for fragments containing targeted regions of the genome.
  • the baits of use in the present invention comprise oligonucleotide probes that are attached to a capture molecule, such as biotin.
  • the oligonucleotide probes may be complementary to sequences within a targeted region of interest, or they may be complementary to regions outside of the targeted region but close enough to that targeted region that both the “anchoring” region and the targeted region are within the same fragment, such that the bait is able to pull down the targeted region by hybridizing to that nearby region (such as a flanking intron).
  • the capture molecule attached to the bait may be any capture molecule that can be used for isolating the bait and its hybridization partner from other fragments in a population.
  • the baits used herein are attached to biotin, and then solid supports comprising streptavidin (including without limitation magnetic streptavidin beads) can be used to capture the baits and the fragments to which they are hybridized.
  • Other capture molecule pairs may include without limitation biotin/neutravidin, antigen/antibody, or complementary oligonucleotide sequences.
  • the oligonucleotide probe portion of the baits can be of any length suitable for hybridizing to targeted regions or to regions near targeted regions.
  • the oligonucleotide probe portion comprises a length of about 5-10, 10-50, 20-100, 30-90, 40-80, 50-70, nucleotides in length.
  • any of the oligonucleotide probe portions described herein may comprise RNA, DNA, non-natural nucleotides such as PNAs, LNAs, and so on, or any combinations thereof.
  • An advantage of the methods and systems described herein is that the targeted regions that are captured are processed prior to capture in such a way that even after the steps of capturing the targeted regions and conducting sequencing analyses, the original molecular context of those targeted regions is retained.
  • the ability to attribute specific targeted regions to their original molecular context (which can include the original chromosome or chromosomal region from which they are derived and/or the location of particular targeted regions in relation to each other within the full genome) provides a way to obtain sequence information from regions of the genome that are otherwise poorly mapped or have poor coverage using traditional sequencing techniques.
  • Short-read technologies are often preferable sequencing technologies, because they possess superior accuracy as compared to long-read technologies.
  • generally used short-read technologies are unable to span across long regions of the genome, and thus information may not be obtainable using these conventional technologies in regions of the genome that are difficult to characterize due to structural characteristics such as long lengths of tandem repeating sequences, high GC content, and exons containing long introns.
  • the molecular context of targeted regions is retained, generally through the tagging procedure illustrated in FIG. 1 and described in further detail herein. As such, links can be made across extended regions of the genome.
  • nucleic acid molecule 207 contains two exons (shaded bars) with a long intronic region ( 208 ).
  • the individual nucleic acid molecule 207 is distributed into its own discrete partition 211 and then fragmented such that different fragments contain different portions of the exons and the intron. Because each of those fragments is tagged such that any sequence information obtained from the fragments is then attributable to the discrete partition in which it was generated, each fragment is thus also attributable to the individual nucleic acid molecule 207 from which it was derived.
  • fragments from different partitions are combined together.
  • Targeted capture methods can then be used to enrich the population of fragments that undergoes further analysis, such as sequencing, with fragments containing the targeted region of interest.
  • the baits used will enrich the population of fragments to capture only those containing a portion of the exons, but regions outside of the exon and intron (such as 209 and 210 ) would not be captured.
  • the final population of fragments that undergoes sequencing will be enriched for the fragments containing the portions of the exons, even if those exons are separated by a long intronic region.
  • Short read, high accuracy sequencing technologies can then be used to identify the sequences of this enriched population of fragments, and because each of the fragments is tagged and thus attributable to its original molecular context, i.e., its original individual nucleic acid molecule, the short read sequences can be pieced together to provide information about the relationship between the exons.
  • the baits used to capture fragments containing all or part of one or more exons are complementary to one or more portions of the one or more exons themselves.
  • the baits are complementary to one or more portions of the intervening introns or to sequences adjacent to or near the exon on either the 3′ or 5′ side of the exon regions (such baits are also referred to herein as “intronic baits”).
  • the baits used to capture the fragments containing all or part of the exon include baits complementary to the exon itself and intronic baits.
  • the ability to retain the molecular context of the targeted regions captured for sequencing also provides the advantage of allowing for sequencing across poorly characterized regions of the genome.
  • a significant percentage at least 5-10% according to, for example Altemose et al., PLOS Computational Biology, May 15, 2014, Vol. 10, Issue 5
  • the reference assembly generally annotates these missing regions as multi-megabase heterochromatic gaps, found primarily near centromeres and on the short arms of the acrocentric chromosomes.
  • This missing fraction of the genome includes structural features that remain resistant to accurate characterization using generally used sequencing technologies.
  • sample preparation methods including methods of fragmenting, amplifying, partitioning, and otherwise processing genomic DNA, can lead to biases or lower coverage of certain regions of a genome.
  • biases or lowered coverage can be compensated for in the methods and systems disclosed herein by altering the concentration of baits used to capture targeted regions of the genome. For example, in some situations it is known that certain regions of the genome will have low coverage after the fragment library is processed, such as regions containing high GC content or other structural variations that lead to bias toward certain areas of the genome over others.
  • the library of baits can be altered to increase the concentration of baits directed to those regions of low coverage—in other words, the population of baits used may be “spiked” to ensure that a sufficient number of fragments containing targeted regions of the genome in those low coverage areas are obtained in the final population of fragments to be sequenced.
  • Such spiking of baits may be conducted through design of custom libraries in some embodiments.
  • the spiking of baits can be conducted in commercially available whole exome kits, such that a custom library of baits directed toward the lower coverage regions are added to off-the-shelf exome capture kits.
  • An advantage of the methods and systems described herein is that the targeted regions that are captured are processed prior to capture in such a way that even after the steps of capturing the targeted regions and conducting sequencing analyses, the original molecular context of those targeted regions is retained.
  • the ability to attribute specific targeted regions to their original molecular context (which can include the original chromosome or chromosomal region from which they are derived and/or the location of particular targeted regions in relation to each other within the full genome) provides a way to obtain sequence information from regions of the genome that are otherwise poorly mapped or have poor coverage using traditional sequencing techniques.
  • nucleic acid molecule 207 contains exons (shaded bars) interrupted by a long intronic region.
  • sequencing technologies would be unable to span the distance across the intron to provide information on the relationship between the two exons.
  • the individual nucleic acid molecule 207 is distributed into its own discrete partition 209 and then fragmented such that different fragments contain different portions of the exons and the intron. Because each of those fragments is tagged such that any sequence information obtained from the fragments is then attributable to the discrete partition in which it was generated, each fragment is thus also attributable to the individual nucleic acid molecule 207 from which it was derived.
  • fragments from different partitions are combined together. Targeted capture methods can then be used to enrich the population of fragments that undergoes further analysis, such as sequencing, with fragments containing the targeted region of interest. In the example illustrated in FIG.
  • the baits used will enrich the population of fragments to capture only those containing a portion of one of exons, but regions outside of the exons (such as 209 and 210 ) would not be captured. Thus, the final population of fragments that undergoes sequencing will be enriched for the fragments containing the exons of interest.
  • Short read, high accuracy sequencing technologies can then be used to identify the sequences of this enriched population of fragments, and because each of the fragments is tagged and thus attributable to its original molecular context, i.e., its original individual nucleic acid molecule, the short read sequences can be pieced together to span across the length of the intervening intron (which can in some examples be on the order of 1, 2, 5, 10 or more kilobases in length) to provide linked sequence information on the two exons.
  • the intervening intron which can in some examples be on the order of 1, 2, 5, 10 or more kilobases in length
  • individual molecular context refers to sequence context beyond the specific sequence read, e.g., relation to adjacent or proximal sequences, that are not included within the sequence read itself, and as such, will typically be such that they would not be included in whole or in part in a short sequence read, e.g., a read of about 150 bases, or about 300 bases for paired reads.
  • a short sequence read e.g., a read of about 150 bases, or about 300 bases for paired reads.
  • the methods and systems provide long range sequence context for short sequence reads.
  • Such long range context includes relationship or linkage of a given sequence read to sequence reads that are within a distance of each other of longer than 1 kb, longer than 5 kb, longer than 10 kb, longer than 15 kb, longer than 20 kb, longer than 30 kb, longer than 40 kb, longer than 50 kb, longer than 60 kb, longer than 70 kb, longer than 80 kb, longer than 90 kb or even longer than 100 kb, or longer.
  • the methods and systems of the invention also provide much longer inferred molecular context.
  • Sequence context can include lower resolution context, e.g., from mapping the short sequence reads to the individual longer molecules or contigs of linked molecules, as well as the higher resolution sequence context, e.g., from long range sequencing of large portions of the longer individual molecules, e.g., having contiguous determined sequences of individual molecules where such determined sequences are longer than 1 kb, longer than 5 kb, longer than 10 kb, longer than 15 kb, longer than 20 kb, longer than 30 kb, longer than 40 kb, longer than 50 kb, longer than 60 kb, longer than 70 kb, longer than 80 kb, longer than 90 kb or even longer than 100 kb.
  • the attribution of short sequences to longer nucleic acids may include both mapping of short sequences against longer nucleic acid stretches to provide high level sequence context, as well as providing assembled sequences from the short sequences through these longer nucleic acids.
  • genomic material may be obtained from a sample taken from a patient.
  • genomic material may be obtained from a sample taken from a patient.
  • samples and types of genomic material of use in the methods and systems discussed herein include without limitation polynucleotides, nucleic acids, oligonucleotides, circulating cell-free nucleic acid, circulating tumor cell (CTC), nucleic acid fragments, nucleotides, DNA, RNA, peptide polynucleotides, complementary DNA (cDNA), double stranded DNA (dsDNA), single stranded DNA (ssDNA), plasmid DNA, cosmid DNA, chromosomal DNA, genomic DNA (gDNA), viral DNA, bacterial DNA, mtDNA (mitochondrial DNA), ribosomal RNA, cell-free DNA, cell free fetal DNA (cffDNA), mRNA, rRNA, tRNA, nRNA, siRNA, snRNA, s
  • the substance may be a fluid, e.g., a biological fluid.
  • a fluidic substance may include, but not limited to, blood, cord blood, saliva, urine, sweat, serum, semen, vaginal fluid, gastric and digestive fluid, spinal fluid, placental fluid, cavity fluid, ocular fluid, serum, breast milk, lymphatic fluid, or combinations thereof.
  • the substance may be solid, for example, a biological tissue.
  • the substance may comprise normal healthy tissues, diseased tissues, or a mix of healthy and diseased tissues. In some cases, the substance may comprise tumors. Tumors may be benign (non-cancer) or malignant (cancer).
  • Non-limiting examples of tumors may include: fibrosarcoma, myxosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma, chordoma, angiosarcoma, endotheliosarcoma, lymphangiosarcoma, lymphangioendotheliosarcoma, synovioma, mesothelioma, Ewing's, leiomyosarcoma, rhabdomyosarcoma, gastrointestinal system carcinomas, colon carcinoma, pancreatic cancer, breast cancer, genitourinary system carcinomas, ovarian cancer, prostate cancer, squamous cell carcinoma, basal cell carcinoma, adenocarcinoma, sweat gland carcinoma, sebaceous gland carcinoma, papillary carcinoma, papillary adenocarcinomas, cystadenocarcinoma, medullary carcinoma, bronchogenic carcinoma, renal cell carcinoma, hepatoma, bile duct carcinoma, chor
  • the substance may be associated with various types of organs.
  • organs may include brain, liver, lung, kidney, prostate, ovary, spleen, lymph node (including tonsil), thyroid, pancreas, heart, skeletal muscle, intestine, larynx, esophagus, stomach, or combinations thereof.
  • the substance may comprise a variety of cells, including but not limited to: eukaryotic cells, prokaryotic cells, fungi cells, heart cells, lung cells, kidney cells, liver cells, pancreas cells, reproductive cells, stem cells, induced pluripotent stem cells, gastrointestinal cells, blood cells, cancer cells, bacterial cells, bacterial cells isolated from a human microbiome sample, etc.
  • the substance may comprise contents of a cell, such as, for example, the contents of a single cell or the contents of multiple cells.
  • contents of a cell such as, for example, the contents of a single cell or the contents of multiple cells.
  • Samples may be obtained from various subjects.
  • a subject may be a living subject or a dead subject. Examples of subjects may include, but not limited to, humans, mammals, non-human mammals, rodents, amphibians, reptiles, canines, felines, bovines, equines, goats, ovines, hens, avines, mice, rabbits, insects, slugs, microbes, bacteria, parasites, or fish.
  • the subject may be a patient who is having, suspected of having, or at a risk of developing a disease or disorder.
  • the subject may be a pregnant woman.
  • the subject may be a normal healthy pregnant woman.
  • the subject may be a pregnant woman who is at a risking of carrying a baby with certain birth defect.
  • a sample may be obtained from a subject by any means known in the art.
  • a sample may be obtained from a subject through accessing the circulatory system (e.g., intravenously or intra-arterially via a syringe or other apparatus), collecting a secreted biological sample (e.g., saliva, sputum urine, feces, etc.), surgically (e.g., biopsy) acquiring a biological sample (e.g., intra-operative samples, post-surgical samples, etc.), swabbing (e.g., buccal swab, oropharyngeal swab), or pipetting.
  • a biological sample e.g., intra-operative samples, post-surgical samples, etc.
  • swabbing e.g., buccal swab, oropharyngeal swab
  • pipetting e.g., buccal swab, oropharyngeal swab
  • Genomic DNA from the NA12878 human cell line was subjected to size based separation of fragments using a Blue Pippin DNA sizing system to recover fragments that were greater than or equal to approximately 10 kb in length.
  • the size selected sample nucleic acids were then copartitioned with barcode beads in aqueous droplets within a fluorinated oil continuous phase using a microfluidic partitioning system (See, e.g., U.S. patent application Ser. No. 14/682,952, filed Apr.
  • aqueous droplets also included the dNTPs, thermostable DNA polymerase and other reagents for carrying out amplification within the droplets, as well as DTT for releasing the barcode oligonucleotides from the beads.
  • dNTPs thermostable DNA polymerase
  • DTT DTT for releasing the barcode oligonucleotides from the beads.
  • BC denotes the barcode portion of the oligonucleotide
  • Nmer denotes a random 10 base N-mer priming sequence used to prime the template nucleic acids. See, e.g., U.S. patent application Ser. No. 14/316,383, filed Jun. 26, 2014, the full disclosure of which is hereby incorporated herein by reference in its entirety for all purposes.
  • the droplets were thermocycled to allow for primer extension of the barcode oligos against the template of the sample nucleic acids within each droplet. This resulted in amplified copy fragments of the sample nucleic acids that included the barcode sequence representative of the originating partition, in addition to the other included sequences set forth above.
  • the emulsion of droplets including the amplified copy fragments was broken and the additional sequencer required components, e.g., read2 primer sequence and P7 attachment sequence, were added to the copy fragments through an additional amplification step, which attached these sequences to the other end of the copy fragments.
  • the barcoded DNA was then subjected to hybrid capture using an Agilent SureSelect Exome capture kit.
  • the three different versions listed above represent three different shear lengths for the barcoded fragments before the second adapter attachment step.
  • Genomic DNA from the NA19701 and NA19661 cell lines was prepared according to the methods described above in Example 1. Data, including phasing data, from those two cells lines is provided in the table below:
US14/927,297 2014-10-29 2015-10-29 Methods and compositions for targeted nucleic acid sequencing Abandoned US20160122817A1 (en)

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