Linked target capture
The invention generally relates to sequencing library preparation methods. In certain embodiments, two or more template nucleic acids are joined together by a linking molecule, such as a PEG derivative. Identical copies of a nucleic acid fragment or both strands of a duplex fragment may be linked together. The linked nucleic acids are amplified, creating linked amplicons. Emulsion PCR with linked primers creates linked template nucleic acids for seeding sequencing clusters and errors can be readily identified by their presence on only one of the linked fragments.
1. A method for capturing genomic regions of interest for sequencing, the method comprising:
ligating adapters comprising priming sites onto a plurality of nucleic acid fragments wherein the plurality of nucleic acid fragments comprise at least one genomic region of interest;
exposing the nucleic acid fragments to a plurality of linked capture molecules comprising a target probe complimentary to at least a portion of the genomic region of interest, the target probe linked to a primer complimentary to the priming site, wherein the exposing step occurs under conditions such that binding of the target probe to the genomic region of interest increases the rate of binding of the primer to the priming site;
extending the 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 exposing and extending steps are performed within an emulsion droplet.
3. The method of claim 1 , wherein the adapters further comprise a barcode sequence.
4. The method of claim 3 , wherein the barcode sequence is sense specific such that sense and antisense strands of a nucleic acid fragment of the plurality of nucleic acid fragments are identifiable as having originated from the nucleic acid fragment.
5. The method of claim 1 , further comprising joining the target probe and the primer together using a linking molecule.
6. The method of claim 5 , wherein the target probe and the primer are biotinylated and the linking molecule comprises a streptavidin-derived molecule.
7. 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.
8. The method of claim 1 , further comprising amplifying the genomic region of interest using primers complimentary to the priming site prior to the sequencing step.
9. The method of claim 8 , wherein the primers complimentary to the priming site are linked such that the amplification step produces linked copies of the genomic region of interest.
10. The method of claim 9 , wherein the linked primers are sense specific such that the amplification step produces linked copies of sense and antisense strands of the genomic region of interest.
11. The method of claim 1 wherein the primer comprises a sequence for flow cell hybridization.
12. The method of claim 1 , wherein the target probe is blocked from extension.
13. The method of claim 5 , wherein the target probe and the primer are linked through click chemistry.
14. The method of claim 1 , wherein the priming site is common across the plurality of nucleic acid fragments.
15. The method of claim 14 , wherein the plurality of nucleic acid fragments comprise two or more different target fragments.