Spatially encoded biological assays
The present invention provides assays and assay systems for use in spatially encoded biological assays. The invention provides an assay system comprising an assay capable of high levels of multiplexing where reagents are provided to a biological sample in defined spatial patterns; instrumentation capable of controlled delivery of reagents according to the spatial patterns; and a decoding scheme providing a readout that is digital in nature.
1. A composition comprising:
a plurality of probes, wherein a probe of the plurality of probes comprises: (i) a first nucleic acid sequence hybridized to at least a portion of a target nucleic acid from a tissue sample affixed to a support and (ii) a second nucleic acid sequence hybridized to at least a portion of an encoding agent,
wherein the encoding agent comprises a third nucleic acid sequence that identifies a spatial location to where the encoding agent was delivered and a fourth nucleic acid sequence hybridized to the second nucleic acid sequence.
2. The composition of claim 1 , wherein the probe and the encoding agent are coupled together, thereby producing a nucleic acid molecule hybridized to the portion of the target nucleic acid and comprising the third nucleic acid sequence.
3. The composition of claim 2 , wherein the probe and the encoding agent are coupled together by ligation.
4. The composition of claim 3 , wherein the ligation comprises the use of a ligase.
5. The composition of claim 1 , wherein the third nucleic acid sequence identifies a spatial location in the tissue sample to which the encoding agent was delivered.
6. The composition of claim 1 , wherein the target nucleic acid is RNA.
7. The composition of claim 6 , wherein the target nucleic acid is mRNA.
8. The composition of claim 1 , wherein the target nucleic acid is DNA.
9. The composition of claim 8 , wherein the target nucleic acid is genomic DNA.
10. The composition of claim 1 , wherein the tissue sample comprises a tissue section.
11. The composition of claim 10 , wherein the tissue section is a fresh, frozen tissue section.
12. The composition of claim 10 , wherein the tissue section is a fixed tissue section.
13. The composition of claim 12 , wherein the fixed tissue section is a formalin-fixed, paraffin-embedded tissue section.
14. The composition of claim 1 , wherein the support is a slide or a culture dish.
15. The composition of claim 1 , further comprising a second probe of the plurality of probes, wherein the second probe comprises: (i) a fifth nucleic acid sequence hybridized to a least a second portion of the target nucleic acid from the tissue sample affixed to the support and (ii) a sixth nucleic acid sequence hybridized to at least a portion of a second encoding agent,
wherein the second encoding agent comprises a seventh nucleic acid sequence that identifies a spatial location to where the second encoding agent was delivered and an eighth nucleic acid sequence hybridized to the sixth nucleic acid sequence.
16. The composition of claim 15 , wherein the second probe and the second encoding agent are coupled together, thereby producing a second nucleic acid molecule hybridized to the second portion of the target nucleic acid and comprising the seventh nucleic acid sequence.
17. The composition of claim 16 , wherein the second probe and the second encoding agent are coupled together by ligation.
18. The composition of claim 17 , wherein the ligation comprises the use of a ligase.
19. The composition of claim 15 , wherein:
the seventh nucleic acid sequence identifies a spatial location in the tissue sample to which the second encoding agent was delivered; and
the seventh nucleic acid sequence is different than the third nucleic acid sequence.
20. The composition of claim 15 , wherein the second probe is hybridized to a different sequence of the target nucleic acid than where the first probe is hybridized to the target nucleic acid.
21. The composition of claim 15 , wherein the second encoding agent further comprises a primer region.
22. The composition of claim 1 , wherein the encoding agent further comprises a primer region.