title: Genetic epidemiology of rheumatoid arthritis.
abstract: OBJECTIVE
  This review aims to summarize articles published between October 2004 and November 2005 that have investigated the genetic epidemiology of rheumatoid arthritis.
  
  
  RESULTS
  The consistent replication of an association between the R620W single nucleotide polymorphism in PTPN22 and rheumatoid arthritis clearly establishes this polymorphism as an important risk factor for rheumatoid arthritis.
  
  
  CONCLUSIONS
  Genetic investigations of rheumatoid arthritis have predominantly been single nucleotide polymorphism-based candidate gene association studies searching for markers of susceptibility, severity or treatment response. Studies of the human leukocyte antigen region have refined and added to our understanding of the complex associations to polymorphisms with this locus. PTPN22 has emerged strongly as a genuine rheumatoid arthritis susceptibility gene with replications of the association to the R620W single nucleotide polymorphism. Many investigations have been conducted on the genetics of treatment response -- some 'generic' and others specific in terms of identifying genetic influences to the mode of action and metabolism of particular agents.
authors.affiliation: arc Epidemiology Unit, Manchester University, School of Epidemiology and Health Sciences, Manchester, UK.
authors.forename: Jacqueline E
authors.initials: JE
authors.lastname: Oliver
authors.forename: Jane
authors.initials: J
authors.lastname: Worthington
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Silman
mesh_terms: D018501:Antirheumatic Agents / Q000494:pharmacology; D001172:Arthritis, Rheumatoid / Q000188:drug therapy / Q000453:epidemiology* / Q000235:genetics*; D004351:Drug Resistance / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D006680:HLA Antigens / Q000235:genetics; D006801:Humans; D009154:Mutation / Q000235:genetics; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D054596:Protein Tyrosine Phosphatase, Non-Receptor Type 22; D017027:Protein Tyrosine Phosphatases / Q000235:genetics*
chemical_list: D018501:Antirheumatic Agents; D006680:HLA Antigens; C516765:PTPN22 protein, human; D054596:Protein Tyrosine Phosphatase, Non-Receptor Type 22; D017027:Protein Tyrosine Phosphatases