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Analysis of DNMT3B 579 G>T polymorphism in the head and neck squamous cell carcinogenesis

Grant number: 11/17886-6
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2011
Effective date (End): October 31, 2013
Field of knowledge:Biological Sciences - Genetics - Human and Medical Genetics
Principal Investigator:Eny Maria Goloni Bertollo
Grantee:Jéssika Nunes Gomes da Silva
Home Institution: Faculdade de Medicina de São José do Rio Preto (FAMERP). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São José do Rio Preto , SP, Brazil


The head and neck squamous cell carcinoma (HNSCC) is considered one of the most often malignant tumors in develop countries that is frequently discovered in advanced stages and have few effective options of treatment. The major risk factors for this type of neoplasia are tobacco and alcohol consumption, poor diet and viral infections. Alterations in folate metabolism may contribute to carcinogenesis process by influencing the reactions of DNA methylation and genomic stability. Polymorphisms in genes that encode enzymes involved in the folate pathway may affect the enzymatic activity by interfering with homocysteine, S-adenosylmethionine concentrations and other products of metabolism that are essentials for DNA synthesis and cellular methylation reactions. Thus, the aim of this study is investigate the association between 579 G>T DNMT3B gene single nucleotide polymorphism (SNP), which encodes the DNMT3B enzyme of folate metabolism, and the carcinogenesis of head and neck risk; and evaluate the impact of this polymorphism with histopathological parameters and risk factors (tobacco, alcohol and gender). Genotype analysis will be performed by the Polymerase Chain Reaction in Real Time in 200 head and neck cancer patients and 400 control individuals. The results may contribute to determination of involvement of the DNMT3B gene in head and neck squamous cell carcinoma susceptibility and make significant contributions to the understanding of the mechanisms related to the tumorigenesis process.