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Frequency of the common germline MUTYH mutations p.G396D and p.Y179C in patients diagnosed with colorectal cancer in Southern Brazil

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Abstract

Introduction

MUTYH-associated polyposis (MAP) is an autosomal recessive cancer predisposition syndrome associated with the development of colorectal tumors and colonic polyps at an early age. MAP syndrome is associated to germline biallelic mutations in the MUTYH gene which lead to deficient DNA repair through the base-excision repair system and accumulation of G:C→T:A transversions. Occurrence of such mutations in oncogenes and tumor suppressor genes drives colorectal carcinogenesis and is associated with the development of colonic polyps. Two common mutations, p.Y179C and p.G396D, are present in approximately 70–80% of MAP in European families with identified MUTYH germline mutations. The aim of this study was to assess the frequency of the germline MUTYH mutations p.Y179C and p.G396D in Brazilian patients with MAP and other hereditary colorectal cancer (CRC) phenotypes, as well as in sporadic CRC cases.

Materials and methods

A total of 75 patients were included. Samples were screened for the MUTYH germline mutations p.Y179C and p.G396D by allelic discrimination assays using allele-specific TaqMan® probes. In all mutation-positive cases, results were confirmed by sequencing.

Results and conclusions

Biallelic germline MUTYH mutations were identified in 4 of 60 (6.6%) patients with a phenotype of hereditary colorectal cancer. Germline MUTYH mutation screening should be considered in the differential diagnosis of hereditary colorectal syndromes, and not only in MAP, but also in familial adenomatous polyposis and Bethesda criteria-positive families. Additional mutation screening studies of the MUTYH gene in a larger number of Brazilian patients will be necessary to confirm these results and determine the validity and applicability of MUTYH mutation screening in our population.

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Acknowledgments

We are indebted to the patients and their family members who agreed to participate in this study and to Fundação de Incentivo à Pesquisa do Hospital de Clínicas de Porto Alegre (FIPe-HCPA) who provided the financial support. We also thank Drs. Hector Yuri Wanderley, Daniel Damin, Bernardo Garicochea, Cristina Netto, and the coloproctology team at Hospital de Clínicas de Porto Alegre for the patient referrals. We are indebted to Stefan Aretz (Institute of Human Genetics, Bonn, Germany) for the sequencing protocols. We also thank Dr. Rogério Margis (Departamento de Genética, Universidade Federal do Rio Grande do Sul) for guidance in establishing the real-time PCR protocols. CEP, SLC, and PAP received grants from CNPq, and PKS received a grant from CAPES.

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Correspondence to Patricia Ashton-Prolla.

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Pitroski, C.E., Cossio, S.L., Koehler-Santos, P. et al. Frequency of the common germline MUTYH mutations p.G396D and p.Y179C in patients diagnosed with colorectal cancer in Southern Brazil. Int J Colorectal Dis 26, 841–846 (2011). https://doi.org/10.1007/s00384-011-1172-1

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  • DOI: https://doi.org/10.1007/s00384-011-1172-1

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