title: HLA haplotypes in a family with ankylosing spondylitis and rheumatoid arthritis.
abstract: HLA haplotypes (including A, B, C and DR loci) were studied in a family with members who had both rheumatoid arthritis (RA) and ankylosing spondylitis (AS). Sacroiliitis was found in 7 family members, one of whom had AS and 2 others erosive, seropositive RA. They carried the B27-DR4 haplotype, suggesting a possible dual genetic association of the same haplotype in both RA and AS. Three other different HLA-B27 containing haplotype were found, 2 of which could be associated with sacroiliitis/AS. Within this family sacroiliitis and/or AS rather seemed associated with the B27 antigen itself than with the same haplotype.
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000150:complications / Q000235:genetics* / Q000276:immunology; D005260:Female; D006680:HLA Antigens / Q000235:genetics*; D015796:HLA-B27 Antigen; D015804:HLA-DR4 Antigen; D000949:Histocompatibility Antigens Class II / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D013167:Spondylitis, Ankylosing / Q000150:complications / Q000235:genetics* / Q000276:immunology
chemical_list: D006680:HLA Antigens; D015796:HLA-B27 Antigen; D015804:HLA-DR4 Antigen; D000949:Histocompatibility Antigens Class II