Signal enhancement method and kit
First Claim
1. A signal amplification method for detecting a target nucleic acid analyte having a homopolymeric region and a target sequence, wherein said homopolymeric region is poly A at the 3'"'"' terminus of said target nucleic acid analyte comprising the steps of:
- (a) contacting said analyte under hybridizing conditions with a multiplicity of reporter probes to form a triple helix, said probes comprising;
(i) a signal region; and
(ii) an oligonucleotide sequence, wherein said oligonucleotide sequence is complementary to said analyte homopolymeric region for forming a stable hybrid therewith, and wherein said reporter probes hybridize with said analyte homopolymeric region to form a triple helix and wherein the hybridization of multiple reporter probes to said analyte homopolymeric region provides for amplification of the detection signal and;
(b) forming an analyte;
capture probe hybrid by contacting said analyte target sequence with a capture probe under hybridizing conditions.
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Abstract
The invention discloses and claims a signal amplification method for detecting a target nucleic acid analyte having a homopolymeric region and a target sequence. The method comprises (a) contacting an analyte under hybridizing conditions with a multiplicity of reporter probes, each probe including a signal region and an oligonucleotide sequence which is complementary to, and capable of forming a stable hybrid with the analyte homopolymeric region, whereby the hybridization of multiple reporter probes to the homopolymeric region provides for signal amplification; and (b) forming an analyte:capture probe hybrid by contacting the analyte target sequence with a capture probe under hybridizing conditions.
146 Citations
16 Claims
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1. A signal amplification method for detecting a target nucleic acid analyte having a homopolymeric region and a target sequence, wherein said homopolymeric region is poly A at the 3'"'"' terminus of said target nucleic acid analyte comprising the steps of:
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(a) contacting said analyte under hybridizing conditions with a multiplicity of reporter probes to form a triple helix, said probes comprising; (i) a signal region; and (ii) an oligonucleotide sequence, wherein said oligonucleotide sequence is complementary to said analyte homopolymeric region for forming a stable hybrid therewith, and wherein said reporter probes hybridize with said analyte homopolymeric region to form a triple helix and wherein the hybridization of multiple reporter probes to said analyte homopolymeric region provides for amplification of the detection signal and; (b) forming an analyte;
capture probe hybrid by contacting said analyte target sequence with a capture probe under hybridizing conditions. - View Dependent Claims (2, 3)
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4. A signal amplification method for detecting a target nucleic acid analyte having a 3'"'"' terminus having a polyA region and a target sequence, comprising the steps of:
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(a) contacting said analyte under hybridizing conditions with a multiplicity of reporter probes, said probes comprising a fluorescent polymer comprising an oligonucleotide linked to a fluorophore, wherein said oligonucleotide is a linear polymer comprising (dT)n, or (U)n, where n is an integer between 8 and 30; and
wherein the hybridization of multiple reporter probes to said analyte polyA region provides for amplification of the detection signal; and(b) forming an analyte;
capture probe hybrid by contacting said analyte target sequence with a capture probe under hybridizing conditions. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16)
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12. A method for detecting a target mRNA analyte in a biological sample, said mRNA having a 3'"'"'-poly A region, comprising the steps of:
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(a) contacting the sample under hybridization conditions with a capture probe immobilized on a solid surface thereby forming a mRNA;
capture probe hybrid, and with a multiplicity of reporter probes, said reporter probes comprising a signal region linked to a homopolymeric sequence comprising (dT)n,(U)n or (U'"'"')n, where n is an integer between 8 and 30, wherein said signal region is comprised of fluorescently-labeled linear or hairpin oligonucleotides; and(b) detecting the fluorescence emitted by the reporter probes hybridized to the 3'"'"' poly A region of the mRNA;
capture probe hybrid.
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Specification