title: Identification of a genetic variant at 2q12.1 associated with blood pressure in East Asians by genome-wide scan including gene-environment interactions.
abstract: BACKGROUND
  Genome-wide association studies have identified many genetic loci associated with blood pressure (BP). Genetic effects on BP can be altered by environmental exposures via multiple biological pathways. Especially, obesity is one of important environmental risk factors that can have considerable effect on BP and it may interact with genetic factors. Given that, we aimed to test whether genetic factors and obesity may jointly influence BP.
  
  
  METHODS
  We performed meta-analyses of genome-wide association data for systolic blood pressure (SBP) and diastolic blood pressure (DBP) that included analyses of interaction between single nucleotide polymorphisms (SNPs) and the obesity-related anthropometric measures, body mass index (BMI), height, weight, and waist/hip ratio (WHR) in East-Asians (n = 12,030).
  
  
  RESULTS
  We identified that rs13390641 on 2q12.1 demonstrated significant association with SBP when the interaction between SNPs and BMI was considered (P < 5 × 10 -8). The gene located nearest to rs13390641, TMEM182, encodes transmembrane protein 182. In stratified analyses, the effect of rs13390641 on BP was much stronger in obese individuals (BMI ≥ 30) than non-obese individuals and the effect of BMI on BP was strongest in individuals with the homozygous A allele of rs13390641.
  
  
  CONCLUSIONS
  Our analyses that included interactions between SNPs and environmental factors identified a genetic variant associated with BP that was overlooked in standard analyses in which only genetic factors were included. This result also revealed a potential mechanism that integrates genetic factors and obesity related traits in the development of high BP.
authors.forename: Yun Kyoung
authors.initials: YK
authors.lastname: Kim
authors.forename: Youngdoe
authors.initials: Y
authors.lastname: Kim
authors.forename: Mi Yeong
authors.initials: MY
authors.lastname: Hwang
authors.forename: Kazuro
authors.initials: K
authors.lastname: Shimokawa
authors.forename: Sungho
authors.initials: S
authors.lastname: Won
authors.forename: Norihiro
authors.initials: N
authors.lastname: Kato
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Tabara
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Yokota
authors.forename: Bok-Ghee
authors.initials: BG
authors.lastname: Han
authors.forename: Jong Ho
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Division of Structural and Functional Genomics, Center for Genome Science, National Institute of Health, Centers for Disease Control and Prevention, 363-700 Chungcheongbuk-do, Republic of Korea. kbj6181@cdc.go.kr.
authors.forename: Bong-Jo
authors.initials: BJ
authors.lastname: Kim
mesh_terms: D044466:Asian People / Q000235:genetics*; D001794:Blood Pressure / Q000235:genetics*; D015992:Body Mass Index; D002889:Chromosomes, Human, Pair 2; D059647:Gene-Environment Interaction; D056726:Genetic Association Studies; D014644:Genetic Variation; D055106:Genome-Wide Association Study; D005838:Genotype; D006801:Humans; D009765:Obesity / Q000235:genetics / Q000503:physiopathology; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide