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Title: Allele-Specific Expression of APC in Adenomatous Polyposis Families
Author: Castellsagué Torrents, Ester
González, Sara
Guinó, Elisabet
Stevens, Kristen N.
Borràs, Ester
Raymond, Victoria M.
Lázaro García, Conxi
Blanco Guillermo, Ignacio
Gruber, Stephen B.
Capellá, G. (Gabriel)
Keywords: Expressió gènica
Genètica molecular
Càncer colorectal
Gene expression
Molecular genetics
Colorectal cancer
Issue Date: 29-Apr-2010
Publisher: Elsevier
Abstract: BACKGROUND & AIMS: Germline mutations in the APC gene cause of most cases of familial adenomatous polyposis (FAP) and a lesser proportion of attenuated FAP (AFAP). Systematic analysis of APC at the RNA level could provide insight into the pathogenicity of identified mutations and the molecular basis of FAP/AFAP in families without identifiable mutations. Here, we analyzed the prevalence of imbalances in the allelic expression of APC in polyposis families with germline mutations in the gene and without detectable mutations in APC and/or MUTYH. METHODS: Allele-specific expression (ASE) was determined by single nucleotide primer extension using an exon 11 polymorphism as an allele-specific marker. In total, 52 APC-mutation-positive (36 families) and 24 APC/MUTYH-mutation-negative (23 families) informative patients were analyzed. Seventy-six controls also were included. RESULTS: Of the APC-mutation-positive families, most of those in whom the mutation was located before the last exon of the gene (12 of 14) had ASE imbalance, which is consistent with a mechanism of nonsense-mediated decay. Of the APC/MUTYH-mutation-negative Families, 2 (9%) had ASE imbalance, which might cause the disease. Normal allele expression was restored shortly after lymphocytes were cultured with puromycin, supporting a 'nonsense-mediated' hypothesis. CONCLUSIONS: ASE analysis might be used to determine the pathogenesis of some cases of FAP and AFAP in which APC mutations are not found. ASE also might be used to prioritize the order in which different areas of APC are tested. RNA-level studies are important for the molecular diagnosis of FAP.
Note: Versió postprint del document publicat a:
It is part of: Gastroenterology, 2010, vol. 139, num. 2, p. 439-447
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ISSN: 0016-5085
Appears in Collections:Articles publicats en revistes (Patologia i Terapèutica Experimental)
Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))

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