Method of tagging using a split DBR
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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.
123 Citations
41 Claims
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1-24. -24. (canceled)
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25. A method of sequencing, comprising:
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a) appending a degenerate base region (DBR) sequence to both ends of a plurality of target nucleic acid molecules in a genomic sample, wherein said DBR sequence 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 said appending produces a population of asymmetrically tagged nucleic acid molecules that each comprise;
(i) a target polynucleotide, (ii) a first DBR sequence at the 5′
end of the target polynucleotide and (iii) a second DBR sequence at the 3′
end of the target polynucleotide, wherein;in each of said asymmetrically tagged nucleic acid molecules the first DBR sequence is different from the second DBR sequence; and the different asymmetrically tagged nucleic acid molecules in said population have different first DBR sequences and different second DBR sequences, relative to one another; b) amplifying at least some of said asymmetrically tagged nucleic acid molecules, thereby producing a population of amplified asymmetrically tagged nucleic acid molecules; and c) sequencing a plurality of the amplified asymmetrically tagged nucleic acid molecules to produce a plurality of sequences, wherein the sequencing step provides, for each of the asymmetrically tagged nucleic acid molecules that are sequenced;
(i) the nucleotide sequence of at least a portion of a target polynucleotide;
(ii) the nucleotide sequence of a first DBR sequence; and
(iii) the nucleotide sequence of a second DBR sequence. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification