Methods for the detection of loss of heterozygosity
First Claim
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1. A method for detecting the presence of a mutant nucleic acid in a sample population, comprising the steps of:
- a) introducing a first radionucleotide to a sample population suspected to contain a subpopulation of a nucleic acid mutant, wherein said first radionucleotide hybridizes to a first wild-type nucleic acid target, a subpopulation of which suspected to be mutated in the sample;
b) introducing a second radionucleotide to the sample, wherein said second radionucleotide hybridizes to a second wild-type nucleic acid target in the samplec) washing said sample to remove unhybridized first and second radionucleotides;
d) determining a number X of radioactive decay events associated with said first radionucleotide;
e) determining a number Y of radioactive decay events associated with said second radionucleotide;
f) determining whether a difference exists between number X and number Y, the presence of a statistically-significant difference being indicative of the presence of a mutation in said sample.
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Abstract
Methods are provided for detecting loss of heterozygosity in a nucleic acid sample. These methods are particularly useful for identifying individuals with gene mutations indicative of early colorectal cancer.
341 Citations
25 Claims
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1. A method for detecting the presence of a mutant nucleic acid in a sample population, comprising the steps of:
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a) introducing a first radionucleotide to a sample population suspected to contain a subpopulation of a nucleic acid mutant, wherein said first radionucleotide hybridizes to a first wild-type nucleic acid target, a subpopulation of which suspected to be mutated in the sample; b) introducing a second radionucleotide to the sample, wherein said second radionucleotide hybridizes to a second wild-type nucleic acid target in the sample c) washing said sample to remove unhybridized first and second radionucleotides; d) determining a number X of radioactive decay events associated with said first radionucleotide; e) determining a number Y of radioactive decay events associated with said second radionucleotide; f) determining whether a difference exists between number X and number Y, the presence of a statistically-significant difference being indicative of the presence of a mutation in said sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20, 21, 22, 23, 24, 25)
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12. A method for determining the number of molecules of a nucleic acid comprising the steps of:
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a) exposing a sample to a plurality of first radionucleotides; b) isolating radionucleotides specifically bound to first target nucleic acid molecules; c) determining a number of radioactive decay events associated with the radionucleotides of step b); d) calculating a number of molecules of said sequence as equivalent to said number of radioactive decay events.
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13. A method for detecting the presence of a mutation in a nucleic acid, comprising the steps of:
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a) exposing a sample to a plurality of a oligonucleotide; b) performing a primer extension reaction in the presence of a plurality of a chain terminating nucleotide, to generate extension products of said oligonucleotide; c) determining the size of the extension products, the presence of extension products of different sizes being indicative of the presence of a mutation. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for detecting loss of heterozygosity in a nucleic acid, comprising the steps of:
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a) contacting a sample with a radionucleotide; b) isolating a nucleic acid specifically bound to said radionucleotide; c) determining a number of radioactive decay events associated with said nucleic acid; d) comparing said number to a reference number, wherein a statistically significant difference between said number and said reference number is indicative of loss of heterozygosity.
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Specification