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• W2072793255 abstract "The purpose of this study was to evaluate the presence and type of mutations of the tumor suppressor gene p53 in squamous carcinoma cell lines of the vulva.Eight low-passage cell lines established from vulvar carcinoma were included in the analysis. Mutational analysis was restricted to exons 5 through 9 of the p53 gene, previously shown to have a high incidence of mutations. The sequences containing exons 5/6,7, and 8/9 were amplified by polymerase chain reaction and screened with a single-strand conformation polymorphism technique on PhastSystem (Pharmacia Biotech, Uppsala, Sweden). Exons from samples showing mobility shifts in single-strand conformation polymorphism were sequenced by polymerase chain reaction direct sequencing.Five vulvar carcinoma cell lines showed abnormal electrophoretic mobility of exons 5/6, one of exons 8/9, and one of exon 7. Reduction to homozygosity was detected in four vulvar carcinoma cell lines. Missense mutations were detected by sequence analysis in UM-SCV-2 (codon 171: GAG[Glu]-->TAG[STOP]), UM-SCV-3 (hot spot codon 273: CGT[Arg]-->TGT[Cys]), UM-SCV-4 (codon 151: CCC[Pro]-->CAC[His]), UM-SCV-5 (codon 155: ACC[Thr]-->ATC[lle]), and UM-SCV-7 (codon 245: GGC[Gly]-->AGC[Ser]). UM-SCV-3 also carried a missense mutation with no amino acid change (codon 314: TCC[Ser]-->TCT[Ser]). UM-SCV-7 carried an additional base deletion at codon 249 (AGG-->AG-), likely resulting in a frameshift in transcription and a truncated protein product. Four of the seven mutations were transitions, two were transversions, and one was a deletion. The presence of transitions suggests that at least a proportion of p53 mutations of these cancers may arise spontaneously without exogenous carcinogen exposure. UM-SCV-1A and UM-SCV-1B were derived from the primary tumor and pleural effusion of the same patient. UM-SCV-6 is a cell line that contains human papillomavirus 16. No mutations in these three cell lines were found by single-strand conformation polymorphism.On the basis of previous observations, loss of tumor suppressor p53 function either by mutation or human papillomavirus involvement is a frequent phenomenon in cervical carcinoma cells. It appears now that functional inactivation of p53 is associated also with vulvar carcinoma cell lines, but mutations of the p53 gene are much more common in vulvar than in cervical carcinoma cell lines." @default.
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• W2072793255 date "1995-11-01" @default.
• W2072793255 modified "2023-10-15" @default.
• W2072793255 title "Mutation of tumor suppressor gene p53 is frequently found in vulvar carcinoma cells" @default.
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• W2072793255 doi "https://doi.org/10.1016/0002-9378(95)90636-3" @default.
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