title: Association of single-nucleotide polymorphisms in RHOB and TXNDC3 with knee osteoarthritis susceptibility: two case-control studies in East Asian populations and a meta-analysis.
abstract: BACKGROUND
  Conflicting findings on the association of single nucleotide polymorphisms (SNPs) in RHOB and TXNDC3 with susceptibility to knee osteoarthritis (OA) have been reported in European Caucasians. To examine the associations of these SNPs with OA in East Asian populations and to evaluate their global significance, we conducted two case-control studies in 955 Chinese and 750 Japanese patients.
  
  
  METHODS
  We genotyped the previously implicated SNPs rs585017 (in RHOB) and rs4720262 (in TXNDC3) in patients with primary symptomatic knee OA with radiographic confirmation and in matched control individuals, and analyzed their associations. We further conducted a meta-analysis of the study findings together with those of previously reported European studies using the DerSimonian-Laird procedure.
  
  
  RESULTS
  A significant association of RHOB with knee OA was observed in male Chinese patients (P = 0.02). No significant associations were found for RHOB in any other comparisons in the East Asian populations. The association of TXNDC3 was replicated in Chinese female (P = 0.04) and Japanese (P = 0.03) patients, although none of these associations persisted after Bonferroni correction. Significant association (P = 0.02 for the allelic frequency) with nonsignificant heterogeneity was found in the East Asian replication study. No significant association was found in any comparison in the meta-analysis for all studies.
  
  
  CONCLUSIONS
  Our study replicates the association, previously reported in European Caucasians, of TXNDC3 with knee OA susceptibility in an East Asian population.
authors.affiliation: The Center of Diagnosis and Treatment for Joint Disease, Drum Tower Hospital Affiliated to Medical School of Nanjing University, 321 Zhongshan Road, Nanjing 210008, Jiangsu, China.
authors.forename: Dongquan
authors.initials: D
authors.lastname: Shi
authors.forename: Takahiro
authors.initials: T
authors.lastname: Nakamura
authors.forename: Masahiro
authors.initials: M
authors.lastname: Nakajima
authors.forename: Jin
authors.initials: J
authors.lastname: Dai
authors.forename: Jianghui
authors.initials: J
authors.lastname: Qin
authors.forename: Haijian
authors.initials: H
authors.lastname: Ni
authors.forename: Yong
authors.initials: Y
authors.lastname: Xu
authors.forename: Chen
authors.initials: C
authors.lastname: Yao
authors.forename: Jia
authors.initials: J
authors.lastname: Wei
authors.forename: Baorui
authors.initials: B
authors.lastname: Liu
authors.forename: Shiro
authors.initials: S
authors.lastname: Ikegawa
authors.forename: Qing
authors.initials: Q
authors.lastname: Jiang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People / Q000235:genetics*; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000453:epidemiology / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000453:epidemiology / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D013879:Thioredoxins / Q000235:genetics*; D020743:rhoB GTP-Binding Protein / Q000235:genetics*
chemical_list: C452260:NME8 protein, human; D013879:Thioredoxins; D020743:rhoB GTP-Binding Protein