Detection of specific DNA sequences by flow cytometry
First Claim
1. A method of detecting preselected DNA sequences in a chromatin particle by fluorescence activated flow cytometry or fluorescence microscopy comprising(1) contacting chromatin with a cross-linking agent for the protein of said chromatin to provide a substantially rigid chromatin particle;
- (2) subjecting the DNA of said chromatin particle to denaturing conditions so as to separate double stranded DNA into single stranded DNA;
(3) contacting preselected sequences of said single stranded DNA with a nucleic acid probe complementary to said preselected DNA sequence;
(4) marking said nucleic acid probe with a fluorescent label; and
(5) detecting said marked nucleic acid probe by fluorescence activated flow cytometry or fluorescence microscopy so to identify said preselected DNA sequence.
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Abstract
A method for detection of DNA sequences. In the method, chromatin (comprising protein and DNA) is contacted with a cross-linking agent for the protein of the chromatin to provide a substantially rigid chromatin particle. The DNA of the chromatin particle is then subjected to treatment to cause a separation of the individual DNA strands into single stranded DNA. Preselected sequences of the single stranded DNA are then contacted with a complementary polynucleotide probe specific for the DNA sequence of interest. The polynucleotide probe is marked with a fluorescent label thereby labelling a target sequence of DNA in the chromatin particles. The fluorescently tagged DNA sequences are then detected by subjecting the polynucleotide probe to a suitable light source and detecting the light emitted by the fluorescent label so as to identify the preselected DNA sequence.
188 Citations
17 Claims
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1. A method of detecting preselected DNA sequences in a chromatin particle by fluorescence activated flow cytometry or fluorescence microscopy comprising
(1) contacting chromatin with a cross-linking agent for the protein of said chromatin to provide a substantially rigid chromatin particle; -
(2) subjecting the DNA of said chromatin particle to denaturing conditions so as to separate double stranded DNA into single stranded DNA; (3) contacting preselected sequences of said single stranded DNA with a nucleic acid probe complementary to said preselected DNA sequence; (4) marking said nucleic acid probe with a fluorescent label; and (5) detecting said marked nucleic acid probe by fluorescence activated flow cytometry or fluorescence microscopy so to identify said preselected DNA sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of detecting preselected DNA sequences in a chromatin particle by fluorescence activated flow cytometry or fluorescence microscopy comprising:
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(1) contacting chromatin with a cross-linking agent for the protein of said chromatin to provide a substantially rigid chromatin particle, (2) subjecting the DNA of said chromatin particle to denaturing conditions so as to separate double stranded DNA into single stranded DNA; (3) contacting preselected sequences of said single stranded DNA with a nucleic acid probe complementary to said preselected DNA sequence, said nucleic acid probe being conjugated to a fluorescent label; (4) detecting said fluorescently labeled nucleic acid probe by fluorescence activated flow cytometry or fluorescence microscopy so to identify said preselected DNA sequence.
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Specification