LATERAL FLOW DETECTION OF TARGET SEQUENCES
First Claim
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1. A method for detecting the presence a target DNA sequence in a sample comprising:
- amplifying the target DNA sequence by applying polymerase chain reaction (PCR), to the sample, wherein the PCR is performed using a composition comprising;
a thermostable DNA polymerase having 5′
exonuclease activity;
forward and reverse amplification primers;
deoxyribonucleotides; and
a probe oligonucleotide that is complementary to an internal region of the target DNA sequence, wherein the probe oligonucleotide comprises a 5′
modification, the 5′
modification comprising a first moiety capable of associating with a first affinity reagent, and wherein the probe oligonucleotide comprises a 3′
modification, the 3′
modification comprising a second moiety capable of associating with a second affinity reagent;
mixing a portion of the PCR composition after amplification of the target DNA sequence with a mobile reporter agent to form a mobile reporter-PCR composition mixture, wherein said mobile reporter agent comprises the second affinity reagent, wherein the second affinity reagent binds to the second moiety of the probe oligonucleotide;
introducing the mobile reporter-PCR composition mixture into a lateral flow strip under conditions that allow the probe oligonucleotide associated with the mobile reporter agent to migrate along the strip, wherein the probe oligonucleotide associated with the mobile reporter agent is captured by first affinity reagents positioned at a detection position of the lateral flow strip, and wherein the first affinity reagent binds to the first moiety on the probe oligonucleotide to inhibit further lateral flow of the probe oligonucleotide associated with the mobile reporter agent;
analyzing the detection position of the lateral flow strip to determine the intensity of the mobile reporter agent captured at the detection position, wherein the intensity of the mobile reporter agent indicates the presence of the target DNA in the sample.
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Abstract
Provided is a sensitive method to specifically detect nucleic acid sequences using a combination of DNA replication based signal amplification (e.g., PCR) and lateral flow analyte detection. The disclosed method uses a dual-labeled DNA probe complementary to a region of the target DNA sequence. Cleavage of the probe, caused by the presence of the amplified DNA target, is detected using lateral flow methods.
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Citations
8 Claims
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1. A method for detecting the presence a target DNA sequence in a sample comprising:
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amplifying the target DNA sequence by applying polymerase chain reaction (PCR), to the sample, wherein the PCR is performed using a composition comprising; a thermostable DNA polymerase having 5′
exonuclease activity;forward and reverse amplification primers; deoxyribonucleotides; and a probe oligonucleotide that is complementary to an internal region of the target DNA sequence, wherein the probe oligonucleotide comprises a 5′
modification, the 5′
modification comprising a first moiety capable of associating with a first affinity reagent, and wherein the probe oligonucleotide comprises a 3′
modification, the 3′
modification comprising a second moiety capable of associating with a second affinity reagent;mixing a portion of the PCR composition after amplification of the target DNA sequence with a mobile reporter agent to form a mobile reporter-PCR composition mixture, wherein said mobile reporter agent comprises the second affinity reagent, wherein the second affinity reagent binds to the second moiety of the probe oligonucleotide; introducing the mobile reporter-PCR composition mixture into a lateral flow strip under conditions that allow the probe oligonucleotide associated with the mobile reporter agent to migrate along the strip, wherein the probe oligonucleotide associated with the mobile reporter agent is captured by first affinity reagents positioned at a detection position of the lateral flow strip, and wherein the first affinity reagent binds to the first moiety on the probe oligonucleotide to inhibit further lateral flow of the probe oligonucleotide associated with the mobile reporter agent; analyzing the detection position of the lateral flow strip to determine the intensity of the mobile reporter agent captured at the detection position, wherein the intensity of the mobile reporter agent indicates the presence of the target DNA in the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification