Single cell nucleic acid detection and analysis
Methods and compositions for digital profiling of nucleic acid sequences present in a sample are provided.
1. A method, comprising:
(a) tagging a plurality of nucleic acid molecules that have different nucleic acid sequences in a sample with a number of different barcodes comprising barcode sequences to generate a plurality of tagged nucleic acid molecules, wherein the tagged nucleic acid molecules comprise a barcode associated with the nucleic acid sequence of the nucleic acid molecule, wherein the barcode comprises at least two barcode sequences and wherein the barcode sequences are present in an asymmetric sequencing adapter prior to use for the tagging;
(b) sequencing the plurality of tagged nucleic acid molecules or derivatives thereof to generate sequence reads, wherein the sequence reads comprise the sequence of the nucleic acid molecule and the sequence of the associated barcodes;
(c) aligning the sequence reads to a reference sequence wherein the starting position and ending position of the sequence of the nucleic acid molecule from which the reads are derived can be determined and, wherein the aligning is performed by a computer implemented method, wherein the reference sequence provides a sense strand and an anti-sense strand information;
(d) determining which strand of the reference sequence the sequence reads align to; and
(e) counting the number of unique barcodes associated with the tagged nucleic acid molecule having sequences that can be aligned by starting position and ending position to the same location on the reference sequence, wherein the counting is performed by a computer implemented method, wherein a barcode is not classified as unique if the sequence of a molecule tagged with the same barcode maps to the same starting position and ending position on the corresponding anti-sense strand of the reference sequence.
2. The method of claim 1 , wherein the asymmetric sequencing adapter is a Y-shaped adapter.
3. The method of claim 1 , wherein the plurality of nucleic acid molecules is obtained from a biological fluid of a subject.
4. The method of claim 1 , wherein each of the plurality of nucleic acid molecules is double stranded DNA.
5. The method of claim 1 , wherein the barcodes comprise pseudo-random or random sequences.
6. The method of claim 1 , wherein the barcodes are double stranded.
7. The method of claim 1 , further comprising comparing the counted number of tagged nucleic acid molecules that align to a first region of the reference sequence to the counted number of tagged nucleic acid molecules that align to a second region of the reference sequence.
8. The method of claim 1 , wherein the sequencing comprises performing massively parallel sequencing.
9. The method of claim 1 , wherein the sequencing comprises performing paired end sequencing.
10. The method of claim 1 , wherein the plurality of nucleic acid molecules comprises nucleic acid molecules with identical sequences, and the number of barcodes is sufficient to differently tag nucleic acid molecules with identical sequences, and the number of barcodes is not sufficient to uniquely barcode each nucleic acid molecule in the sample.
11. The method of claim 1 , further comprising amplifying the plurality of tagged nucleic acid molecules to produce amplicons.
12. The method of claim 1 , wherein there is an error-resistant distance between the barcode sequences.
13. The method of claim 1 , wherein the error-resistant distance between the barcode sequence is at least 9.
14. A method, comprising:
(a) tagging a plurality of nucleic acid molecules that have different nucleic acid sequences in a sample with a number of different barcodes comprising barcode sequences to generate a plurality of tagged nucleic acid molecules, wherein the tagged nucleic acid molecules comprise a barcode associated with the nucleic acid sequence of the nucleic acid molecule, wherein the barcode comprises at least two barcode sequences and wherein the barcode sequences are present in an asymmetric sequencing adapter prior to use for the tagging;
(b) sequencing the plurality of tagged nucleic acid molecules or derivatives thereof to generate sequence reads, wherein the sequence reads comprise the sequence of the nucleic acid molecule and the sequence of the associated barcodes;
(c) aligning the sequence reads to a reference sequence wherein the starting position and ending position of the sequence of the nucleic acid molecule from which the reads are derived can be determined, wherein the aligning is performed by a computer implemented method, wherein the reference sequence provides a sense strand and an anti-sense strand information;
(d) determining which strand of the reference sequence the sequence reads align to;
(e) identifying reads with the same barcode that can be mapped to the same starting position and ending position on the corresponding anti-sense strand of the reference sequence; and
(f) determining a count number of the nucleic acid molecules that have been tagged and can be aligned to the same reference sequence location by a computer implemented method.
15. The method of claim 14 , wherein the asymmetric sequencing adapter is a Y-shaped adapter.
16. The method of claim 14 , wherein the plurality of nucleic acid molecules is obtained from a biological fluid of a subject.
17. The method of claim 14 , wherein each of the plurality of nucleic acid molecules is double stranded DNA.
18. The method of claim 14 , wherein the barcodes comprise pseudo-random or random sequences.
19. The method of claim 14 , wherein the barcodes are double stranded.
20. The method of claim 14 , further comprising comparing the counted number of tagged nucleic acid molecules that align to a first region of the reference sequence to the counted number of tagged nucleic acid molecules that align to a second region of the reference sequence.
21. The method of claim 14 , wherein the sequencing comprises performing massively parallel sequencing.
22. The method of claim 14 , wherein the sequencing comprises performing paired end sequencing.
23. The method of claim 14 , wherein the plurality of nucleic acid molecules comprises nucleic acid molecules with identical sequences, and the number of barcodes is sufficient to differently tag nucleic acid molecules with identical sequences, and the number of barcodes is not sufficient to uniquely barcode each nucleic acid molecule in the sample.
24. The method of claim 14 , further comprising amplifying the plurality of tagged nucleic acid molecules to produce amplicons.
25. The method of claim 14 , wherein there is an error-resistant distance between the barcode sequences.
26. The method of claim 14 , wherein the error-resistant distance between the barcode sequence is at least 9.