Nucleic acid analysis using sequence tokens
The present invention provides methods and compositions for tagging nucleic acid sequence fragments, e.g., a set of nucleic acid sequence fragments from a single genome, with one or more unique members of a collection of oligonucleotide tags, or sequence tokens, which, in turn, can be identified using a variety of readout platforms. As a general rule, a given sequence token is used once and only once in any tag sequence. In addition, the present invention also provides methods for using the sequence tokens to efficiently determine variations in nucleotide sequences in the associated nucleic acid sequence fragments.
1. A method of tagging a plurality of populations of polynucleotides each with a unique sequence token tag, comprising:
generating a plurality of unique sequence token tags;
dividing the polynucleotides of each of said populations of polynucleotides into at least two non-overlapping nucleic acid segments; and
ligating a unique sequence token tag to the at least two non-overlapping nucleic acid segments of each of said populations of polynucleotides to provide a plurality of populations of polynucleotides each tagged with a unique sequence token tag,
wherein each unique sequence token tag is used to tag only one of said populations of polynucleotides.
2. The method of claim 1 , wherein said at least two non-overlapping nucleic acid segments are all non-overlapping segments of said polynucleotide.
3. The method of claim 2 , wherein each of said at least two non-overlapping nucleic acid segments has a length that is the same for all such segments.
4. The method of claim 1 , wherein each population of polynucleotides comprises genomic DNA from a single subject.
5. The method of claim 4 , wherein the subject is a human.
6. The method of claim 1 , wherein said dividing is by restriction enzyme digestion of the polynucleotides.
7. A method of tagging a plurality of genomic DNA samples from a plurality of subjects each with a unique sequence token tag, comprising:
generating a plurality of unique sequence token tags;
dividing the genomic DNA of each of said plurality of DNA samples into at least two non-overlapping nucleic acid segments; and
ligating a unique sequence token tag to the at least two non-overlapping nucleic acid segments of each of said genomic DNA samples to provide a plurality of genomic DNA samples from a plurality of subjects each tagged with a unique sequence token tag,
wherein each unique sequence token tag is used to tag only the genomic DNA from one of said plurality of subjects.
8. The method of claim 7 , wherein said at least two non-overlapping nucleic acid segments are all non-overlapping segments of said polynucleotide.
9. The method of claim 8 , wherein each of said at least two non-overlapping nucleic acid segments has a length that is the same for all such segments.
10. The method of claim 7 , wherein the subject is a human.
11. The method of claim 7 , wherein said dividing is by restriction enzyme digestion of the polynucleotides.
12. The method of claim 1 , wherein said generating step comprises:
designing multiple groups of triplet units, wherein each of said groups of triplet units has four members, wherein each member of a group of triplet units is different from the other members of the same group by at least 2 out of 3 bases; and
choosing a unique combination of said triplet units to generate each of said plurality of unique sequence token tags.
13. The method of claim 12 , wherein each member of said plurality of sequence token tags has the same number of s bases and w bases, wherein s is G or C and w is A or T.
14. The method of claim 13 , wherein each member of said plurality of unique sequence token tags have no adjacent GC pairs.
15. The method of claim 14 , wherein a unique combination of at least three of said triplet units are chosen to generate each of said plurality of unique sequence token tags.
16. The method of claim 15 , wherein said multiple groups of triplet units are:
Group I (sww): CAA, GAT, CTT, GTA;
Group II (wsw): TGA, AGT, TCT, ACA;
Group III (wws): TAG, AAC, TTC, ATG;
Group IV (www): TAA, AAT, TTT, ATA; and
Group V (sws): CAG, GAC, CTC, GTG.
17. The method of claim 7 , wherein said generating step comprises:
designing multiple groups of triplet units, wherein each of said groups of triplet units has four members, wherein each member of a group of triplet units is different from the other members of the same group by at least 2 out of 3 bases; and
choosing a unique combination of said triplet units to generate each of said plurality of unique sequence token tags.
18. The method of claim 17 , wherein each member of said plurality of sequence token tags has the same number of s bases and w bases, wherein s is G or C and w is A or T.
19. The method of claim 18 , wherein each member of said plurality of unique sequence token tags have no adjacent GC pairs.
20. The method of claim 19 , wherein a unique combination of at least three of said triplet units are chosen to generate each of said plurality of unique sequence token tags.
21. The method of claim 20 , wherein said multiple groups of triplet units are:
Group I (sww): CAA, GAT, CTT, GTA;
Group II (wsw): TGA, AGT, TCT, ACA;
Group III (wws): TAG, AAC, TTC, ATG;
Group IV (www): TAA, AAT, TTT, ATA; and
Group V (sws): CAG, GAC, CTC, GTG.