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Germline MUTYH (MYH) mutations in Portuguese individuals with multiple colorectal adenomas

✍ Scribed by Glória Isidro; Francisco Laranjeira; Ana Pires; Júlio Leite; Fernando Regateiro; F. Castro e Sousa; José Soares; Clara Castro; João Giria; Maria J. Brito; Ana Medeira; Ricardo Teixeira; Henrique Morna; Isabel Gaspar; Carla Marinho; Rosa Jorge; António Brehm; J. Silva Ramos; Maria Guida Boavida

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
73 KB
Volume
24
Category
Article
ISSN
1059-7794

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✦ Synopsis

Germinal mutations in the base excision repair (BER) gene MUTYH (MYH) have recently been described in association with predisposition to multiple colorectal adenomas and cancer. In contrast to the classic dominant condition of familial adenomatous polyposis (FAP) due to germinal mutations in the APC gene, the MYH polyposis is an autosomal recessive disease. The identification of individuals affected by MYH polyposis brings new and important implications for the diagnostic, screening, genetic counseling, follow up and therapeutic options in these patients. In this study, screening for germinal mutations in the MYH gene was performed in 53 Portuguese individuals with multiple colorectal adenomas or classic adenomatous polyposis, in whom no mutation had been identified in the APC gene. The results revealed the presence of biallelic germline MYH mutations in 21 patients. In addition, we here report 3 mutations (c.340T>C [p.Y114H]; c.503G>A [p.R168H]; and c.1186_1187insGG [p.E396fsX437]) which, to our knowledge, have not been previously described.

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