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- W2000784101 abstract "RA is a heterogeneous group of disorders characterized by variations in clinical manifestations, disease course, and probably response to therapeutic interventions. We have addressed the question whether genetically and potentially etiologically more homogeneous subgroups of RA patients can be defined based upon the expression of the RA-linked sequence motif in the third hypervariable region of the HLA-DRB1 gene. Genetic comparison of patients classified upon clinical manifestation and disease course demonstrated that patients with mild disease were genetically distinct from those progressing to severe and destructive disease. Specifically, rheumatoid factor (RF) negative patients preferentially expressed RA-linked HLA-DRB1 alleles with an arginine substitution in position 71, whereas the alleles with a lysine substitution in position 71 accumulated in RF+ patients. RF- patients were further subdivided based on clinical markers (time of onset of erosive disease and requirement for aggressive therapy). Clinical heterogeneity correlated with genetic heterogeneity. Patients with early erosive disease and patients requiring aggressive therapy frequently typed HLA-DRB1*04+. Patients with late erosive/nonerosive disease or a benign disease course manageable with nonaggressive treatment preferentially expressed HLA-DRB1*01 or lacked an RA-linked haplotype. These data indicate that the heterogeneity of RA reflects genetic differences. Sequence variations within the disease-linked sequence motif, as well as polymorphisms surrounding the candidate genetic element, affect pattern, course, and treatment response of RA. Amino acid position 71 in the HLA-DRB1 gene has a unique role, the understanding of which may provide important clues to disease etiology." @default.
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- W2000784101 date "1995-05-01" @default.
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- W2000784101 title "Correlation between disease phenotype and genetic heterogeneity in rheumatoid arthritis." @default.
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- W2000784101 doi "https://doi.org/10.1172/jci117900" @default.
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