Homogenous method for the detection of a polynucleotide, with e.g. cleavable lanthanide chelate label
First Claim
1. A homogenous method for detecting at least one target polynucleotide in a sample comprising the steps ofcontacting a sample, comprising said polynucleotide with an oligonucleotide probe labeled with a label under conditions where said oligonucleotide probe selectively hybridizes to said target polynucleotide, wherein the signal of the label itself increases or decreases upon the hybridization of the oligonucleotide probe and the target polynucleotide, and the label consists of a fluorescent lanthanide chelate,exciting the label, andwithout removing unhybridized probes, monitoring the signal intensity of said label by time resolved fluorometry to indicate the presence or absence in a sample of said target polynucleotide.
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Abstract
The present invention relates to a homogenous method for detecting at least one target polynucleotide in a sample comprising the steps of
- contacting a sample comprising said polynucleotide or polynucleotide forming nucleic acids or derivatives thereof, with labelled oligonucleotide probe under conditions where said oligonucleotide probe selectively hybridizes to said target polynucleotide, wherein the signal of the label increases or decreases upon the hybridization between the oligonucleotide probe and the target polynucleotide,
- exciting the label, and
- monitoring the signal intensity of said label to indicate the presence or absence in a sample of said target polynucleotide.
According to the invention, said label is measured by time resolved fluorometry.
17 Citations
13 Claims
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1. A homogenous method for detecting at least one target polynucleotide in a sample comprising the steps of
contacting a sample, comprising said polynucleotide with an oligonucleotide probe labeled with a label under conditions where said oligonucleotide probe selectively hybridizes to said target polynucleotide, wherein the signal of the label itself increases or decreases upon the hybridization of the oligonucleotide probe and the target polynucleotide, and the label consists of a fluorescent lanthanide chelate, exciting the label, and without removing unhybridized probes, monitoring the signal intensity of said label by time resolved fluorometry to indicate the presence or absence in a sample of said target polynucleotide.
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11. A method of determining the presence of a target nucleic acid sequence in a sample, comprising the steps of
providing a mixture of a sample of interest, and a nucleic acid probe comprising a nucleic acid sequence selectively binding said target nucleic acid sequence and one or more labels wherein the one or more labels consist of fluorescent lanthanide chelates, wherein each of said fluorescent lanthanide chelate is capable of changing the intensity of its own fluorescence emission upon hybridization of said probe to said target nucleic acid sequence, subjecting the mixture to conditions under which the probe selectively hybridizes to the target nucleic acid, and without removing unhybridized probes from the mixture, determining whether each fluorescent lanthanide chelate changes the intensity of its own fluorescence emission by measuring fluorescence emission from the mixture by time resolved fluorometry, thereby determining the presence of said target nucleic acid sequence in the sample if the intensity does change over time.
Specification