Linked target capture and ligation
The invention generally relates to capturing, amplifying, and sequencing nucleic acids. In certain embodiments, linked capture probes and multiple binding and extension steps improve specificity over traditional single binding target capture techniques. Methods of seeding sequencing clusters with captured target nucleic acids are also disclosed. Linked adapters may be used to increase adapter ligation selectively or efficiency and yield. Ligation adapters and primers can be linked to various sequence-specific or feature-specific molecules to selectively bind targets for ligation or amplification with universal adapters or primers.
1. A method for capturing genomic regions of interest for targeted DNA sequencing, the method comprising:
ligating universal priming sites onto a plurality of duplex nucleic acid fragments wherein the plurality of duplex nucleic acid fragments comprise at least one genomic region of interest;
denaturing the plurality of ligated duplex nucleic acid fragments to create single stranded nucleic acid fragments that include at least one fragment comprising the genomic region of interest and one universal priming site of the universal priming sites;
exposing the single stranded nucleic acid fragments to a plurality of linked capture probes comprising a nucleic acid binding-protein that binds in a sequence-specific manner to a target sequence in the genomic region of interest, wherein the nucleic acid binding-protein is linked to a universal primer;
binding the nucleic acid binding-protein to the target sequence within the least one fragment;
binding the universal primer to the one universal priming site in the at least one fragment while the nucleic acid binding protein is bound to the target sequence within the at least one fragment;
extending the universal primer to produce a copy of the genomic region of interest; and
sequencing the genomic region of interest.
2. The method of claim 1 , wherein the denaturing, exposing, and extending steps are performed within an emulsion droplet.
3. The method of claim 1 , further comprising repeating the exposing and extending steps to amplify the genomic region of interest prior to the sequencing step.
4. The method of claim 1 , further comprising amplifying the genomic region of interest using universal primers complementary to the universal priming site.
5. The method of claim 4 , wherein the universal primers are linked such that the amplification step produces linked copies of the genomic region of interest.
6. The method of claim 5 , wherein the linked universal primers are sense specific such that the amplification step produces linked copies of the sense and antisense strands of the genomic region of interest.
7. The method of claim 1 , wherein the target protein probe is selected from the group consisting of a zinc finger domain, a TAL effector, an antibody, a MBD domain, SSB protein, DsbA protein, and an RNA binding protein.
8. The method of claim 1 , wherein the linked capture probes comprise a barcode identifying the target protein probe.