Increasing confidence of allele calls with molecular counting
First Claim
1. A method for assessing the presence of an allele of a polymorphic target sequence in a tagged genomic sample, comprising:
- a) amplifying a population of different initial target DNA molecules from a tagged genomic sample thereby producing a population of amplified target DNA molecules, wherein the different initial target DNA molecules that comprise a polymorphic target sequence are tagged with different degenerate base region (DBR) sequences, wherein said DBR sequences comprises at least one nucleotide base selected from;
R, Y, S, W, K, M, B, D, H, V, N and modified versions thereof and wherein the amplified target DNA molecules comprise said polymorphic target sequence and an associated DBR sequence of said DBR sequences;
b) sequencing a plurality of the amplified target DNA molecules, thereby producing a plurality of sequence reads, wherein the sequencing step provides, for each of the amplified target DNA molecules that are sequenced;
(i) the nucleotide sequence of at least a portion of the polymorphic target sequence and (ii) the nucleotide sequence of an associated DBR sequence;
c) assessing, using a computer, the presence of said allele in said tagged genomic sample, based on;
(i) a determination of the number of said different DBR sequences that are associated with said allele; and
(ii) a determination of the number of said sequence reads that comprise each of the different DBR sequences that are associated with said allele.
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Abstract
Aspects of the present invention include methods and compositions for determining the number of individual polynucleotide molecules originating from the same genomic region of the same original sample that have been sequenced in a particular sequence analysis configuration or process. In these aspects of the invention, a degenerate base region (DBR) is attached to the starting polynucleotide molecules that are subsequently sequenced (e.g., after certain process steps are performed, e.g., amplification and/or enrichment). The number of different DBR sequences present in a sequencing run can be used to determine/estimate the number of different starting polynucleotides that have been sequenced. DBRs can be used to enhance numerous different nucleic acid sequence analysis applications, including allowing higher confidence allele call determinations in genotyping applications.
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Citations
22 Claims
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1. A method for assessing the presence of an allele of a polymorphic target sequence in a tagged genomic sample, comprising:
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a) amplifying a population of different initial target DNA molecules from a tagged genomic sample thereby producing a population of amplified target DNA molecules, wherein the different initial target DNA molecules that comprise a polymorphic target sequence are tagged with different degenerate base region (DBR) sequences, wherein said DBR sequences comprises at least one nucleotide base selected from;
R, Y, S, W, K, M, B, D, H, V, N and modified versions thereof and wherein the amplified target DNA molecules comprise said polymorphic target sequence and an associated DBR sequence of said DBR sequences;b) sequencing a plurality of the amplified target DNA molecules, thereby producing a plurality of sequence reads, wherein the sequencing step provides, for each of the amplified target DNA molecules that are sequenced;
(i) the nucleotide sequence of at least a portion of the polymorphic target sequence and (ii) the nucleotide sequence of an associated DBR sequence;c) assessing, using a computer, the presence of said allele in said tagged genomic sample, based on; (i) a determination of the number of said different DBR sequences that are associated with said allele; and (ii) a determination of the number of said sequence reads that comprise each of the different DBR sequences that are associated with said allele. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification