Methods and devices for single-molecule whole genome analysis
Provided are methods and devices for single-molecule genomic analysis. In one embodiment, the methods entail processing a double-stranded nucleic acid and characterizing said nucleic acid. These methods are useful in, e.g. determining structural variations and copy number variations between individuals.
1. A method of characterizing a first DNA and a second DNA, comprising:
labeling a plurality of sequence-specific locations on a first DNA and a second DNA with a labeling technique that does not cut or nick a strand of DNA;
linearizing at least a portion of the labeled first DNA and a portion of the labeled second DNA;
detecting a recognizable pattern of labels on the linearized first DNA and on the linearized second DNA, wherein the labels are indicative of a sequence characteristic of the first DNA and a sequence characteristic of the second DNA; and
comparing the recognizable patterns of the first and second DNAs to ascertain a similarity or difference in a sequence characteristic of the first and second DNAs.
2. The method of claim 1 , wherein the first and second DNAs are each double stranded.
3. The method of claim 2 , wherein the labeling is effected with one or more selected from the group consisting of a methyltransferase, a zinc finger protein, an antibody, a transcription factor, a DNA binding protein, a hairpin polyamide, a triplex-forming oligodeoxynucleotide, a peptide nucleic acid, and a combination thereof.
4. The method of claim 2 , wherein the labeling is effected with a methyltransferase.
5. The method of claim 2 , wherein the label further comprises a fluorophore or quantum dot.
6. The method of claim 2 , further comprising labeling at least one additional sequence-specific location on the first DNA with a label that differs from the label of claim 1 .
7. The method of claim 6 , wherein one label identifies genomic information, and wherein the other label identifies epigenomic information.
8. The method of claim 1 , wherein the labeling technique does not comprise hybridization of a sequence-specific nucleic acid probe.
9. The method of claim 1 , wherein detecting the recognizable pattern of labels on the on the linearized first DNA and on the linearized second DNA comprises simultaneously detecting labels at the plurality of sequence-specific locations on the first DNA and the second DNA in the same field of view.
10. A method of characterizing a DNA, comprising:
labeling a plurality of sequence-specific locations on a first DNA with a labeling technique that does not cut or nick a strand of DNA;
linearizing at least a portion of the labeled first DNA;
detecting a recognizable pattern of labels on the linearized first DNA, wherein the labels are indicative of a sequence characteristic of the first DNA; and
comparing the recognizable pattern of labels on the linearized first DNA to a pattern of labels indicative of a known sequence characteristic of a reference DNA to ascertain a similarity or difference in a sequence characteristic of the first DNA and the reference DNA.
11. The method of claim 10 , wherein the labeling technique does not comprise hybridization of a sequence-specific nucleic acid probe.
12. The method of claim 10 , wherein the linearizing includes transporting the DNA into a nanochannel.
13. The method of claim 10 , further comprising correlating a recognizable pattern of labels to one or more selected from the group consisting of a structure, a sequence assembly, a genetic map, a cytogenetic map, a methylation pattern, a physiological characteristic, a location of a CpG island, an epigenomic pattern, and a combination thereof.
14. The method of claim 10 , wherein the first DNA is double stranded.
15. The method of claim 10 , wherein the labeling is effected with one or more selected from the group consisting of a methyltransferase, a zinc finger protein, an antibody, a transcription factor, a DNA binding protein, a hairpin polyamide, a triplex-forming oligodeoxynucleotide, a peptide nucleic acid, and any combination thereof.
16. The method of claim 10 , wherein the labeling is effected with a methyltransferase.
17. The method of claim 10 , wherein the label further comprises a fluorophore or quantum dot.
18. The method of claim 10 , further comprising labeling at least one additional sequence-specific location on the first DNA with a label that differs from the label of claim 10 .
19. The method of claim 18 , wherein one label identifies genomic information, and wherein the other label identifies epigenomic information.
20. The method of claim 10 , wherein the sequence characteristic of the reference DNA is obtained from a reference database genome assembly sequencing or an in silico barcode computationally generated based on same sequence-specific motifs.