British Medical Bulletin 51:267-285 (1995)
© 1995 The British Council
research-article |
Genetic epidemiology of rheumatoid disease
ARC Epidemiology Research Unit, University of Manchester Manchester, UK
Abstract
The aetiology of rheumatoid arthritis (RA) has both genetic and environmental origins. However, the relationship of these with each other and with RA disease is complicated as both genes and environment may be protective or render individuals susceptible. Diagnostic certainty and disease heterogeneity have posed serious hurdles for investigating RA. Patients with similar disease phenotypes may have different aetiologies and it may now be more appropriate to investigate genetic susceptibility with respect to disease process or characteristic immunopathology. Disease concordance studies have been a classical approach to estimating the upper threshold of the genetic contribution to RA and recent studies have approximately halved the much quoted figure of 32% reported by Lawrence for RA concordance in monozygotic twins. However, the interpretation of twin data has to be treated with caution as MZ twins can differ in terms of somatic rearrangement/mutation of immunoglobulin and T cell receptor genes, X chromosome inactivation in females, genomic imprinting and in utero immune relationship. Calculations based on heritability put the genetic component in RA much higher. HLA is an important genetic factor in RA and risk is thought to be associated with a consensus sequence of amino acids within the third hypervariable region of certain DRB1 alleles. It is not clear that HLA is not particularly associated with onset of synovitis but is more associated with progression and severity of the disease process. The HLA-DRB1*0401/0404 genotype.
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