Mutation detection in DNA oligonucleotides based on a Guanine quenching method coupled with enzymatic digestion of single-stranded DNA.
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).
Maruyama
Tatsuo
T
Department of Applied Chemistry Graduate School of Engineering, Kyushu University, 6-10-1 Hakozaki, 812-8581, Fukuoka, Japan.
Shinohara
Toshimitsu
T
Ichinose
Hirofumi
H
Kitaoka
Momoko
M
Okamura
Nobuko
N
Kamiya
Noriho
N
Goto
Masahiro
M
D001483:Base Sequence; D004277:DNA, Single-Stranded / Q000235:genetics / Q000378:metabolism*; D004259:DNA-Directed DNA Polymerase / Q000737:chemistry / Q000235:genetics; D005090:Exodeoxyribonucleases / Q000378:metabolism; D016650:Fluorescein-5-isothiocyanate / Q000737:chemistry; D005452:Fluoresceins / Q000737:chemistry; D005453:Fluorescence; D031541:Fluorescence Resonance Energy Transfer / Q000379:methods*; D006160:Guanosine Triphosphate / Q000737:chemistry / Q000235:genetics; D006515:Hepatitis B virus / Q000201:enzymology; D006801:Humans; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D009838:Oligodeoxyribonucleotides / Q000737:chemistry / Q000235:genetics*; D015345:Oligonucleotide Probes / Q000737:chemistry / Q000235:genetics; D017354:Point Mutation; D012235:Rhodamines / Q000737:chemistry
C114557:5-carboxytetramethylrhodamine succinimidyl ester; D004277:DNA, Single-Stranded; D005452:Fluoresceins; D009838:Oligodeoxyribonucleotides; D015345:Oligonucleotide Probes; D012235:Rhodamines; C045132:4-carboxyfluorescein; D006160:Guanosine Triphosphate; D004259:DNA-Directed DNA Polymerase; D005090:Exodeoxyribonucleases; C046264:gene b exonuclease; D016650:Fluorescein-5-isothiocyanate