title: A novel functional TagSNP Rs7560488 in the DNMT3A1 promoter is associated with susceptibility to gastric cancer by modulating promoter activity.
abstract: DNA-methyltransferase (DNMT)-3A which contains DNMT3A1 and DNMT3A2 isoforms have been suggested to play a crucial role in carcinogenesis and showed aberrant expression in most cancers. Accumulated evidences also indicated that single nucleotide polymorphisms (SNP) in DNMT genes were associated with susceptibility to different tumors. We hypothesized that genetic variants in DNMT3A1 promoter region are associated with gastric cancer risk. We selected the tagSNPs from the HapMap database for the Chinese and genotyped in a case-control study to evaluate the association with gastric cancer (GC) in a Chinese population. We identified that the functional tagSNP rs7560488 T>C associated with a significantly increased risk of GC. In vitro functional analysis by luciferase reporter assay and EMSA indicated that the tagSNP rs7560488 T>C substantially altered transcriptional activity of DNMT3A1 gene via influencing the binding of some transcriptional factors, although a definite transcriptional factor remains to be established. Compared with TT homozygotes, subjects who were TC heterozygotes and CC homozygotes exhibited a reduced expression of DNMT3A1. Furthermore, stratified analysis showed that individuals who harbor TC or CC genotypes less than 60 years old were more susceptible to GC. Our results suggest that the genetic variations in the DNMT3A1 promoter contribute to the susceptibility to GC and also provide an insight that tagSNP rs7560488 T>C may be a promising biomarker for predicting GC genetic susceptibility and a valuable information in GC pathogenesis.
authors.affiliation: The Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Departments of Medical Genetics and Developmental Biology, Medical School of Southeast University, Nanjing, China.
authors.forename: Huazhang
authors.initials: H
authors.lastname: Wu
authors.affiliation: The Third Affiliated Hospital of Harbin Medical University (Harbin Medical University Cancer Hospital), Harbin, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Zhang
authors.affiliation: The Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Departments of Medical Genetics and Developmental Biology, Medical School of Southeast University, Nanjing, China.
authors.forename: Pihai
authors.initials: P
authors.lastname: Gong
authors.affiliation: The Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Departments of Medical Genetics and Developmental Biology, Medical School of Southeast University, Nanjing, China.
authors.forename: Fengchang
authors.initials: F
authors.lastname: Qiao
authors.affiliation: The Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Departments of Medical Genetics and Developmental Biology, Medical School of Southeast University, Nanjing, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Wang
authors.affiliation: The Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Departments of Medical Genetics and Developmental Biology, Medical School of Southeast University, Nanjing, China.
authors.forename: He
authors.initials: H
authors.lastname: Cui
authors.affiliation: The Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Departments of Medical Genetics and Developmental Biology, Medical School of Southeast University, Nanjing, China.
authors.forename: Xinyuan
authors.initials: X
authors.lastname: Sui
authors.affiliation: The Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Departments of Medical Genetics and Developmental Biology, Medical School of Southeast University, Nanjing, China.
authors.forename: Jifan
authors.initials: J
authors.lastname: Gao
authors.affiliation: The Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Departments of Medical Genetics and Developmental Biology, Medical School of Southeast University, Nanjing, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Fan
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000235:genetics; D000483:Alleles; D044466:Asian People / Q000235:genetics; D001483:Base Sequence; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000235:genetics*; D000090205:DNA Methyltransferase 3A; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D060148:HapMap Project; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D011401:Promoter Regions, Genetic / Q000235:genetics*; D013274:Stomach Neoplasms / Q000201:enzymology* / Q000235:genetics*; D018808:Transcription Factor AP-1 / Q000378:metabolism; D014158:Transcription, Genetic / Q000235:genetics; D055815:Young Adult
chemical_list: C000717967:DNMT3A protein, human; D018808:Transcription Factor AP-1; D004248:DNA (Cytosine-5-)-Methyltransferases; D000090205:DNA Methyltransferase 3A