APC gene mutations and colorectal adenomatosis in familial adenomatous polyposis

F. Ficari, A. Cama, R. Valanzano, M. C. Curia, R. Palmirotta, G. Aceto, D. L. Esposito, S. Crognale, A. Lombardi, L. Messerini, R. Mariani-Costantini, F. Tonelli, P. Battista

Research output: Contribution to journalArticle

Abstract

Correlations between germline APC mutation sites and colorectal pathophenotypes, as evaluated by the direct count of adenomas at colectomy, were investigated analysing colectomy specimens from 29 FAP patients carrying one mis-sense (codon 208) and 14 frame-shift or non-sense APC mutations (codons 232, 367, 437, 623, 876, 995, 1061, 1068, 1075, 1112, 1114, 1309, 1324, 1556). The missense mutation at codon 208 was associated with a relatively mild colorectal pathophenotype. The mutation at codon 367, subject to alternative splicing, was associated with attenuated FAP. The mutation at codon 1309 was associated with the profuse colorectal adenomatosis. For 13 mutations, predicted to result in null alleles or truncated APC proteins, we correlated density and distribution of colorectal adenomas with the predicted functional effects of the mutation. The most severe colorectal pathophenotype was significantly associated with the truncating mutation at codon 1309, which is located downstream to the I β-catenin binding domain but upstream II β-catenin-binding domain. Mutations between codons 867 and 1114, which affect the I β-catenin binding domain, as well as mutations occurring in exons 6 and 9, predicted to result in null alleles, were associated with a less severe colorectal pathophenotype. Overall, the highest number of adenomas was detected in the right colon, followed by the left colon, transverse colon sigma and rectum. However, the highest density of adenomas was observed in the left colon, followed by the right colon, sigma, transverse colon and rectum. Colorectal carcinomas, observed in only five patients, were all in the left colon.

Original languageEnglish
Pages (from-to)348-353
Number of pages6
JournalBritish Journal of Cancer
Volume82
Issue number2
Publication statusPublished - 2000

Keywords

  • APC (adenomatous polyposis coli) gene
  • Colorectal adenomas
  • Distribution
  • FAP (familial adenomatous polyposis)
  • Germline mutations
  • Number

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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  • Cite this

    Ficari, F., Cama, A., Valanzano, R., Curia, M. C., Palmirotta, R., Aceto, G., Esposito, D. L., Crognale, S., Lombardi, A., Messerini, L., Mariani-Costantini, R., Tonelli, F., & Battista, P. (2000). APC gene mutations and colorectal adenomatosis in familial adenomatous polyposis. British Journal of Cancer, 82(2), 348-353.