Genetic association of multiple sclerosis and HL-A determinants.
Segregation of HL-A haplotypes was analyzed in 10 families in which there were at least two cases of multiple sclerosis. In nine families, multiple sclerosis was associated with only one parental HL-A haplotype. Specific HL-A determinants associated with multiple sclerosis differed among the families, suggesting that another histocompatibility-linked factor, possibly a gene determining susceptibility (or lack of resistance) played an etiologic role. Lod score analysis based on nine families suggested a close association between such a gene (labeled MSS) and the HL-A gene complex. However, when all 10 available families were analyzed, the association approached but did not reach statistical significance. Thus, the HL-A haplotype segregation did not prove that a histocompatibility-linked gene is related to the cause of multiple sclerosis, but study of additional multiplex families is certainly warranted. Other factors, possibly genetic (although not HL-A-linked), environmental, or the two together, may be required for multiple sclerosis to become clinically apparent.
D000939:Epitopes; D005260:Female; D006680:HLA Antigens / Q000032:analysis*; D006649:Histocompatibility Antigens / Q000032:analysis*; D006801:Humans; D008297:Male; D009103:Multiple Sclerosis / Q000235:genetics* / Q000276:immunology; D010375:Pedigree
D000939:Epitopes; D006680:HLA Antigens; D006649:Histocompatibility Antigens