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DNA methylation is a major epigenetic modification in humans, and aberrant DNA methylation may play an important role in the development of various cancers through the silencing of some tumor suppressor genes. DNMT3B is required for the establishment and maintenance of genomic methylation patterns. The -149 C/T single nucleotide polymorphism (SNP) in the promoter of DNMT3B has been identified. This SNP influences DNMT3B promoter function, with the T allele having greater activity than the C allele, and is associated with an increased risk of lung cancer. The purpose of our study was to investigate the correlation between the DNMT3B promoter polymorphism and the development and progression of gastric cancer. We analyzed the SNP of the DNMT3B promoter in 152 gastric cancer patients and 247 controls from a Japanese population using PCR-RFLP and sequencing analysis, and also studied the association between the genotypes of DNMT3B and clinicopathological parameters among cases. Allelic difference was not found between gastric cancer patients and control subjects at the target site, -149 bp from the transcriptional start site in the DNMT3B gene promoter. Only the T/T genotype was detected in all gastric cancer patients and control subjects. We concluded that there was no association between SNP of the DNMT3B promoter and gastric cancer risk in a Japanese population.
Oncology Reports – Spandidos Publications
Published: Nov 1, 2005
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