title: P53 tumour-suppressor gene mutations are mainly localised on exon 7 in human primary and metastatic prostate cancer.
abstract: Mutations in the p53 tumour-suppressor gene are among the most common genetic alterations in human cancers. In the present study we analysed the mutations in the p53 tumor-suppressor gene in 25 primary and 20 metastatic human prostate cancer specimens. DNA extracted from the paraffin-embedded sections was amplified by hot-start polymerase chain reaction, and p53 gene mutations in the conserved mid-region (exons 4-9) were examined using single-strand conformation polymorphism (SSCP) analysis and immunohistochemistry. In the present study, we used a novel hot-start PCR-SSCP technique using DNA Taq polymerase antibody, which eliminates primer-dimers and non-specific products. Because of this new technique, the results of PCR-SSCP showed very high resolution. Polymerase chain reaction products were sequenced directly for point mutations for the p53 gene. Mutations were found in 2 out of 25 primary prostate cancers (8%) and 4 out of 20 metastatic cancers (20%). Mutations were observed exclusively in exon 7 and not in exons 4, 5, 6, 8 or 9. Nuclear accumulation of p53 protein, determined by immunohistochemistry, correlated with the degree of metastasis in prostatic cancer.
authors.affiliation: Department of Urology, University of California San Francisco, USA.
authors.forename: R
authors.initials: R
authors.lastname: Dahiya
authors.forename: G
authors.initials: G
authors.lastname: Deng
authors.forename: K M
authors.initials: KM
authors.lastname: Chen
authors.forename: R M
authors.initials: RM
authors.lastname: Chui
authors.forename: P C
authors.initials: PC
authors.lastname: Haughney
authors.forename: P
authors.initials: P
authors.lastname: Narayan
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics* / Q000556:secondary*; D001483:Base Sequence; D017931:DNA Primers; D004273:DNA, Neoplasm / Q000032:analysis / Q000235:genetics; D005091:Exons; D016158:Genes, p53; D006801:Humans; D007150:Immunohistochemistry; D008207:Lymphatic Metastasis; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D016612:Paraffin Embedding; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D011471:Prostatic Neoplasms / Q000235:genetics* / Q000473:pathology*; D012189:Retrospective Studies; D016159:Tumor Suppressor Protein p53 / Q000032:analysis
chemical_list: D017931:DNA Primers; D004273:DNA, Neoplasm; D016159:Tumor Suppressor Protein p53