Long insert-based whole genome sequencing
View Patent ↗The present invention is directed to a method of detecting a genomic rearrangement in a nucleic acid sample with Long Insert Whole Genome Sequencing (LI-WGS). The method may include obtaining a nucleic acid sample and then fragmenting the nucleic acid sample (e.g., via sonication). In particular, the fragmenting may result in the production of a plurality of inserts. Thereafter, the method comprises purifying the plurality of inserts using magnetic beads and then amplifying the purified plurality of inserts. In addition, the method further comprises sequencing the purified and amplified plurality of inserts. In some aspects, the plurality of inserts have a length of between about 800 and about 1,100 base pairs.
1. A method of detecting a genomic translocation in a tumor biopsy nucleic acid sample, the method comprising the steps of:
(a) obtaining the tumor biopsy nucleic acid sample;
(b) fragmenting the nucleic acid sample with sonication to produce a fragmented sample comprising nucleic acids with a length of 900 to 1,100 base pairs;
(c) mixing a volume of the fragmented sample with a volume of magnetic beads;
(d) removing unbound nucleic acids approximately 200 base pairs or shorter;
(e) selecting nucleic acids having a median length between 900 and 1,100 base pairs to produce a plurality of inserts;
(f) amplifying the plurality of inserts; and
(g) performing whole-genome sequencing on the plurality of inserts to detect the genomic translocation.
2. The method of claim 1 , further comprising simultaneously detecting a copy number variant (CNV).
3. The method of claim 1 , wherein the nucleic acid sample of step (a) is not circularized or linearized.
4. The method of claim 1 , wherein the nucleic acid sample of step (a) comprises at least about 1 microgram of DNA.
5. The method of claim 1 , wherein the nucleic acid sample is fragmented with an ultrasonicator at an intensity of about 6.
6. The method of claim 5 , wherein the sonication occurs for about 20 seconds in a volume of less than 100 μl of nucleic acid sample.
7. The method of claim 1 , wherein the ratio of the volume of the fragmented sample to the volume of magnetic beads is about 1:1.
8. The method of claim 1 , further comprising ligating an adapter to the fragmented sample and purifying the fragmented sample with an agarose gel prior to sequencing.
9. The method of claim 8 , further comprising quantifying the purified and amplified fragmented sample.
10. The method of claim 1 , wherein the whole-genome sequencing is Sanger sequencing, next-generation sequencing, pyrosequencing, sequencing by oligonucleotide ligation and detection, massively parallel sequencing, pooled sequencing, or barcoded DNA sequencing.
11. The method of claim 1 , wherein the nucleic acid sample of step (a) comprises 0.1-2.0 micrograms of DNA.
12. A method of detecting a genomic translocation in a tumor biopsy nucleic acid sample from a subject, the method comprising the steps of:
(a) obtaining the tumor biopsy nucleic acid sample from the subject;
(b) fragmenting the nucleic acid sample with sonication to produce a fragmented sample comprising nucleic acids with a length of about 900 to 1,100 base pairs;
(c) mixing a volume of the fragmented sample with a volume of magnetic beads;
(d) selecting nucleic acids having a median length between 900 and 1,100 base pairs to produce a plurality of inserts;
(e) amplifying the plurality of inserts; and
(f) performing whole-genome sequencing on the plurality of inserts to detect the genomic translocation.
13. The method of claim 12 , further comprising simultaneously detecting a copy number variant (CNV).
14. The method of claim 12 , further comprising ligating an adapter to the fragmented sample and purifying the fragmented sample with an agarose gel prior to sequencing.
15. The method of claim 12 , wherein the nucleic acid sample of step (a) comprises 0.1-2.0 micrograms of DNA.
16. The method of claim 15 , further comprising confirming that the genomic translocation is unique to the tumor biopsy by comparing results from the sequencing of the plurality of inserts from the sample to results from sequencing of a reference sample from the subject, wherein the reference sample does not comprise a tumor biopsy.
17. The method of claim 12 , wherein the nucleic acid sample of step (a) comprises at least about 1 microgram of DNA.