Unbiased identification of double-strand breaks and genomic rearrangement by genome-wide insert capture sequencing
The invention provides for systems, methods, compositions, and kits for the complete characterization of targeted nuclease specificity which necessitates techniques that can assess the full possibility space of off-target activity and genomic stability following genome editing. Also provided are the materials and techniques which enable the comprehensive genomic stability accompanying a range of cellular perturbations, including genome editing (ZFN, TALEN, CRISPR, and future technologies) and disease modeling among other applications.
1. A method for identifying the location of at least one double strand break (DSB) in DNA of a cell or tissue, the method comprising:
a) ligating a linker to each end of the DSB to create a linker-DSB conjugate at each end,
wherein the linker comprises:
i) a promoter sequence for linear amplification, and
ii) a unique molecular identifier sequence;
b) producing a polynucleotide complementary to the linker-DSB conjugate by linear amplification; and
c) determining the sequence of the complementary polynucleotide, whereby the location of the DSB is identified;
wherein each linker comprises a different unique molecular identifier sequence, and wherein the complementary polynucleotide comprises a sequence of the DNA adjacent to the DSB.
2. The method of claim 1 , wherein the cell or tissue is a fixed cell or issue.
3. The method of claim 1 , wherein the cell or tissue was cultured for a period of time from 24 hours to 60 days.
4. The method of claim 1 , wherein the cell or tissue was cultured for a period of time from 5 hours to 30 days.
5. The method of claim 1 , wherein the cell or tissue was exposed to an agent that promotes DSBs.
6. The method of claim 5 , wherein the agent comprises endonuclease activity.
7. The method of claim 5 , wherein the agent comprises a genome editing agent.
8. The method of claim 5 , wherein the agent comprises a ZFN, TALEN, or CRISPR.
9. The method of claim 1 , wherein the DSB is blunt ended before linker ligation.
10. The method of claim 1 , wherein the DNA is fragmented before linear amplification.
11. The method of claim 1 , wherein the linear amplification product is an RNA.
12. The method of claim 1 , which further comprises reverse transcription and sequencing of the linear amplification product.
13. The method of claim 12 , which further comprises exponential amplification of the reverse transcript prior to sequencing.
14. The method according to claim 1 for use in a non-naturally occurring or engineered composition to assess the phenotypic effects of mutations at individual genomic loci or genomic rearrangement.
15. The method according to claim 1 for use in a non-naturally occurring or engineered composition to map on and off-target genomic editing events.
16. The method according to claim 1 for use in a non-naturally occurring or engineered composition for the identification of editing at discrete on and off-target loci.
17. The method of claim 1 , wherein the promoter sequence is a T7 promoter sequence.
18. The method of claim 1 , wherein the linker is ligated to a single strand or both strands of the DSB.
19. The method of claim 18 , wherein this ligated to the 5′ end of the single strand.
20. The method of claim 18 , wherein the linker is ligated to the 3′ end of the single strand.
21. The method of claim 18 , wherein the linker comprises a blunt end, a 5′ overhang, or a 3′ overhang.