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Autoantibodies in twins discordant for rheumatoid arthritis
  1. A J Svendsen1,
  2. J V Hjelmborg2,
  3. A Wiik3,
  4. G Houen3,
  5. K O Kyvik1,4,
  6. P Junker5
  1. 1The Danish Twin Registry, Institute of Public Health, University of Southern Denmark, Denmark
  2. 2Epidemiology and Statistics, Institute of Public Health, University of Southern Denmark, Denmark
  3. 3Department of Clinical Biochemistry and Immunology, Statens Serum Institute, Copenhagen, Denmark
  4. 4Institute of Regional Health Services Research, University of Southern Denmark, Denmark
  5. 5Department of Rheumatology, Odense University Hospital, Odense C, Denmark
  1. Correspondence to Dr A J Svendsen, The Danish Twin Registry, Epidemiology, Institute of Public Health, University of Southern Denmark, J.B.Winsløws Vej 9B, 5000 Odense C, Denmark; asvendsen{at}health.sdu.dk

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Rheumatoid arthritis (RA) is characterised by frequent occurrence of autoantibodies. The anti-cyclic citrullinated peptide antibodies (anti-CCP) are now used routinely as they may antedate the development of seropositive RA, because their diagnostic sensitivity and specificity is better than rheumatoid factors (RFs), and because they may predict a more severe outcome.1,,3 Previous studies have observed an increased prevalence of RF and anti-CCP in first-degree relatives of patients with RA.4 One study on RA discordant twin pairs provided evidence for genetic effects on IgM-RF and IgG-RF independent of HLA-DR.5 Anti-CCPs have been reported to be independently associated with the HLA-DRB1 shared epitope, PTPN22 and smoking, …

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