Sequencing using a predetermined coverage amount of polynucleotide fragments
First Claim
1. A method of sequencing one or more target polynucleotides, the method comprising the steps of:
- providing a predetermined coverage amount of fragments of the one or more target polynucleotides to form a population containing overlapping first-sized fragments of the one or more target polynucleotides;
forming a number of separate mixtures from the population of first-sized fragments;
fragmenting the first-sized fragments in the separate mixtures to form populations of second-sized fragments;
incorporating oligonucleotide tags into the second-sized fragments in the separate mixtures to produce tagged second-sized fragments,whereby an oligonucleotide tag incorporated into a second-sized fragment in a separate mixture identifies that mixture;
obtaining sequence reads by sequencing at least a portion of a plurality of the tagged second-sized fragments from at least some of the mixtures; and
obtaining complete or partial nucleotide sequences of the one or more target polynucleotides by assembling at least a portion of the sequence reads, wherein the assembling comprises determining that second-sized fragment sequences comprising the same oligonucleotide tag have the same mixture of origin.
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Accused Products
Abstract
The invention provides methods and kits for ordering sequence information derived from one or more target polynucleotides. In one aspect, one or more tiers or levels of fragmentation and aliquoting are generated, after which sequence information is obtained from fragments in a final level or tier. Each fragment in such final tier is from a particular aliquot, which, in turn, is from a particular aliquot of a prior tier, and so on. For every fragment of an aliquot in the final tier, the aliquots from which it was derived at every prior tier is known, or can be discerned. Thus, identical sequences from overlapping fragments from different aliquots can be distinguished and grouped as being derived from the same or different fragments from prior tiers. When the fragments in the final tier are sequenced, overlapping sequence regions of fragments in different aliquots are used to register the fragments so that non-overlapping regions are ordered. In one aspect, this process is carried out in a hierarchical fashion until the one or more target polynucleotides are characterized, e.g. by their nucleic acid sequences, or by an ordering of sequence segments, or by an ordering of single nucleotide polymorphisms (SNPs), or the like.
170 Citations
19 Claims
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1. A method of sequencing one or more target polynucleotides, the method comprising the steps of:
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providing a predetermined coverage amount of fragments of the one or more target polynucleotides to form a population containing overlapping first-sized fragments of the one or more target polynucleotides; forming a number of separate mixtures from the population of first-sized fragments; fragmenting the first-sized fragments in the separate mixtures to form populations of second-sized fragments; incorporating oligonucleotide tags into the second-sized fragments in the separate mixtures to produce tagged second-sized fragments, whereby an oligonucleotide tag incorporated into a second-sized fragment in a separate mixture identifies that mixture; obtaining sequence reads by sequencing at least a portion of a plurality of the tagged second-sized fragments from at least some of the mixtures; and obtaining complete or partial nucleotide sequences of the one or more target polynucleotides by assembling at least a portion of the sequence reads, wherein the assembling comprises determining that second-sized fragment sequences comprising the same oligonucleotide tag have the same mixture of origin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of determining a nucleotide sequence of one or more target polynucleotides of an organism without cell-based cloning, the method comprising the steps of:
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providing a plurality of aliquots of a sample, at least some of which comprise a plurality of first-sized fragments of the target polynucleotide(s); producing tagged second-sized fragments from the first-sized fragments; mixing together fragments from a plurality of the aliquots to form a mixture; obtaining sequence reads from second-sized fragments of the mixture; and assembling the sequence reads to produce an assembled sequence of the target polynucleotide(s) by a process that comprises grouping sequence reads from fragments that have the same tag. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of determining a nucleotide sequence of one or more target polynucleotides of an organism without cell-based cloning, the method comprising the steps of:
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providing a plurality of aliquots, at least some of which comprise a plurality of first-sized fragments of the target polynucleotide(s) wherein any given portion of the target polynucleotide(s) is represented by a single non-overlapping fragment in sixty percent or more of the mixtures containing such portion; producing tagged second-sized fragments from the first-sized fragments; mixing together second-sized fragments from a plurality of the aliquots to form a mixture; obtaining sequence reads from second-sized fragments of the mixture; and assembling the sequence reads to produce an assembled sequence of the target polynucleotide(s) by a process that comprises grouping sequence reads from fragments that have the same tag.
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Specification