Photothermal detection of nucleic acid hybridization
First Claim
1. A method of detecting a target nucleic acid sequence, comprising:
- providing a hybridization complex comprising (a) a capture probe that is attached to a solid surface and (b) a target nucleic acid sequence that is hybridized to the capture probe, wherein the target nucleic acid sequence additionally comprises at least one nanoparticle attached to the target nucleic acid sequence;
exposing the solid surface to light at a wavelength absorbed by the nanoparticle; and
detecting a temperature of the solid surface, whereby detection of an increased temperature relative to a temperature of the solid surface that would be detected in the absence of said complex indicates the presence or amount of target nucleic acid sequence hybridized to the solid surface.
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Abstract
A nucleic acid hybridization detection assay is carried out at a solid surface. Capture probes comprising single-stranded oligonucleotides are immobilized to a solid substrate surface. In some embodiments using sandwich assay methodology, the capture probes hybridize complementary target nucleic acid sequences, which in turn are bound to detection probes comprising nanoparticle-oligonucleotide conjugates comprising target-complementary oligonucleotides. In some embodiments, detection probes comprise nanoparticles attached to molecules comprising one partner of a ligand-binding pair (e.g., streptavidin), while target sequences comprise the other partner of the ligand-binding pair (e.g., biotin). The solid surface is exposed to light at a wavelength that is absorbed by the nanoparticle, thus eliciting a temperature jump. The heat generated by the nanoparticle excitation is detected by a photothermography method such as infrared thermography.
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Citations
42 Claims
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1. A method of detecting a target nucleic acid sequence, comprising:
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providing a hybridization complex comprising (a) a capture probe that is attached to a solid surface and (b) a target nucleic acid sequence that is hybridized to the capture probe, wherein the target nucleic acid sequence additionally comprises at least one nanoparticle attached to the target nucleic acid sequence;
exposing the solid surface to light at a wavelength absorbed by the nanoparticle; and
detecting a temperature of the solid surface, whereby detection of an increased temperature relative to a temperature of the solid surface that would be detected in the absence of said complex indicates the presence or amount of target nucleic acid sequence hybridized to the solid surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification