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Low frequency of p53 mutations observed in a diverse collection of primary hepatocellular carcinomas
Journal article   Open access   Peer reviewed

Low frequency of p53 mutations observed in a diverse collection of primary hepatocellular carcinomas

Kenneth H Buetow, Val C Sheffield, Minghua Zhu, Tianlun Zhou, Fu-Min Shen, Okio Hino, Moyra Smith, Brian J McMahon, Anne P Lanier, W Thomas London, …
Proceedings of the National Academy of Sciences - PNAS, Vol.89(20), pp.9622-9626
10/15/1992
DOI: 10.1073/pnas.89.20.9622
PMCID: PMC50184
PMID: 1329103
url
https://doi.org/10.1073/pnas.89.20.9622View
Published (Version of record) Open Access

Abstract

Recent studies of the p53 tumor suppressor locus (designated TP53) in primary hepatocellular carcinoma (PHC) have identified a high frequency of codon 249 mutations. Due to the geographic location from which the samples were obtained and the substitution observed, the mutation was suggested to be attributable to aflatoxin B1 (AFB1) exposure. To determine the generality of this phenomenon, we have examined PHC tissues from 107 geographically and ethnically diverse sources. The frequency of p53 gene mutations was evaluated by using PCR/restriction-digest methods, GC-clamp (G+C-rich sequence) denaturing gradient gel electrophoresis, and DNA sequencing. The mutation rate observed in tumors from high-AFB1-exposure regions (25%) was more than double the rate observed in low-exposure regions (12%) but lower than the 50% frequency previously reported. Codon 249 mutations occurred at a much lower frequency than previously reported (2 of 107 samples examined). These results suggest that changes in DNA encoding p53 may not represent primary oncogenic effects but instead represent genetic changes related to tumor progression. High AFB1 levels may facilitate the generation of these progressional changes, but not by inducing a specific p53 gene mutation at codon 249 as previously reported.

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