Abstract
Fluorescence quenching by guanine allows DNA hybridization to be monitored and any point mutations in oligonucleotides to be detected. However, fluorescence quenching is often affected by untargeted guanine located in a protruding end (single-strand DNA) of the probe-target DNA duplex resulting in an unsatisfactory sensitivity. In the present study, we used enzymatic digestion of the protruding end of a probe-target DNA duplex to avoid interference by untargeted guanine on fluorescence quenching for detection of a nucleobase mutation. Enzymatic digestion of the protruding end of the DNA duplex fully prevented interference by untargeted guanine, and produced a marked difference in the quenching ratios (36% for wild-type, and 0% for mutant).
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Base Sequence
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DNA, Single-Stranded / genetics
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DNA, Single-Stranded / metabolism*
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DNA-Directed DNA Polymerase / chemistry
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DNA-Directed DNA Polymerase / genetics
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Exodeoxyribonucleases / metabolism
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Fluorescein-5-isothiocyanate / chemistry
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Fluoresceins / chemistry
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Fluorescence
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Fluorescence Resonance Energy Transfer / methods*
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Guanosine Triphosphate / chemistry
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Guanosine Triphosphate / genetics
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Hepatitis B virus / enzymology
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Humans
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Molecular Sequence Data
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Nucleic Acid Hybridization
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Oligodeoxyribonucleotides / chemistry
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Oligodeoxyribonucleotides / genetics*
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Oligonucleotide Probes / chemistry
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Oligonucleotide Probes / genetics
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Point Mutation*
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Rhodamines / chemistry
Substances
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5-carboxytetramethylrhodamine succinimidyl ester
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DNA, Single-Stranded
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Fluoresceins
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Oligodeoxyribonucleotides
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Oligonucleotide Probes
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Rhodamines
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4-carboxyfluorescein
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Guanosine Triphosphate
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DNA-Directed DNA Polymerase
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Exodeoxyribonucleases
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gene b exonuclease
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Fluorescein-5-isothiocyanate