alexa Prevalence of the Y165C, G382D and 1395delGGA germline mutations of the MYH gene in Italian patients with adenomatous polyposis coli and colorectal adenomas.
Genetics & Molecular Biology

Genetics & Molecular Biology

Hereditary Genetics: Current Research

Author(s): Gismondi V, Meta M, Bonelli L, Radice P, Sala P,

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Abstract Biallelic germline mutations in the base excision repair gene MYH have been reported in patients with multiple colorectal adenomas and cancer and in sporadic FAP patients not showing a detectable APC germline mutation. In this study, the prevalence of the common Y165C and G382D germline variants of the MYH gene was examined in 70 FAP/AAPC patients with no detectable APC mutation and a family history compatible with recessive inheritance. In addition, 141 normal-population adenoma patients (mean number of adenomas, 2.8; range, 1-9) and 52 clean colon controls were studied. The entire coding region of the MYH gene was analyzed in Y165C or G382D heterozygous patients. Since the same second mutational event (a 3 bp deletion in exon 14, 1395delGGA) was detected in 3 patients, the prevalence of this variant was also examined in all groups. In all, 14 of 70 patients in the FAP/AAPC group (20\%; 95\% CI = 11.7-31.6\%) had biallelic germline MYH variants and 3 were heterozygotes (4.3\%). None of the 141 normal-population adenoma patients carried biallelic germline MYH variants (95\% CI = 0.06-4.1\%) and 3 were heterozygotes (2.1\%). In the control group, no MYH variants were detected. These results indicated that MYH-associated polyposis (MAP) is present in about 20\% of Italian FAP/AAPC patients, in whom no germline APC mutation is detectable and showing a family history compatible with recessive inheritance, and in a small fraction of patients with colorectal adenomas in the general population. In addition, our data suggest that mutation 1395delGGA is a subpolymorphic MYH mutational event in some Caucasian populations. Copyright 2004 Wiley-Liss, Inc. This article was published in Int J Cancer and referenced in Hereditary Genetics: Current Research

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