title: Association Between the Estrogen Receptor Beta (ESR2) Rs1256120 Single Nucleotide Polymorphism and Adolescent Idiopathic Scoliosis: A Systematic Review and Meta-Analysis.
abstract: METHODS
  A systematic review and meta-analysis.
  
  
  OBJECTIVE
  The aim of this study was to assess and synthesize the current evidence on the association between the rs1256120 single nucleotide polymorphism (SNP) of the estrogen receptor beta gene (ESR2) and adolescent idiopathic scoliosis (AIS).
  
  
  BACKGROUND
  Hormonal disturbance has been postulated as a potential etiological factor in the development of AIS. As estrogen receptors are important mediators of estrogen response, mutations in these genes, including rs1256120 of ESR2, have been chosen as susceptibility candidates for AIS predisposition. The association of rs1256120 with AIS has been investigated in several recent studies, but showed conflicting evidence. We conducted a systematic review to evaluate the strength of this body of evidence and quantitative synthesis to examine sources of heterogeneity.
  
  
  METHODS
  This study conformed to PRISMA guidelines. Using a sensitive search strategy, PubMed (MEDLINE), EMBASE, and HuGE Literature Finder databases were searched to identify relevant studies for inclusion in the systematic review and meta-analysis. Risk of bias was assessed using a modified Newcastle-Ottawa Scale. The inverse variance model was used to calculate summary odds ratios (ORs) and corresponding 95% confidence intervals (CIs) for the allelic (C vs. T) and genotypic comparisons. Planned subgroup and sensitivity analyses were performed.
  
  
  RESULTS
  Three studies were included for systematic review and meta-analysis (n = 1264 AIS cases and n=1020 controls). A null relationship was found between rs1256120 and AIS (allelic OR = 1.20, 95% CI: 0.81-1.78, P = 0.36, I = 84.9%), with the first reported association likely to be false-positive and contributing substantially to heterogeneity.
  
  
  CONCLUSIONS
  Findings from the systematic review and meta-analysis suggest that rs1256120 of ESR2 is unlikely to be a predisposing or disease-modifying genetic risk factor for AIS.
  
  
  METHODS
  2.
authors.affiliation: Ottawa Combined Adult Spinal Surgery Program, The Ottawa Hospital, Ottawa, ON, Canada.
authors.forename: Linlu
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Ottawa Combined Adult Spinal Surgery Program, The Ottawa Hospital, Ottawa, ON, Canada.|Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada.
authors.forename: Darren M
authors.initials: DM
authors.lastname: Roffey
authors.affiliation: Ottawa Combined Adult Spinal Surgery Program, The Ottawa Hospital, Ottawa, ON, Canada.
authors.forename: Suzan
authors.initials: S
authors.lastname: Chen
mesh_terms: D000293:Adolescent; D000483:Alleles; D047629:Estrogen Receptor beta / Q000235:genetics*; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D020641:Polymorphism, Single Nucleotide; D012600:Scoliosis / Q000235:genetics*
chemical_list: D047629:Estrogen Receptor beta