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Am J Hum Genet. 2001 Oct;69(4):900-3. Epub 2001 Aug 22.

Evidence of linkage with HLA-DR in DRB1*15-negative families with multiple sclerosis.

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  • 1Division of Neurology, Karolinska Institutet at Huddinge University Hospital, Stockholm, Sweden.

Abstract

The importance of the HLA-DR locus to multiple sclerosis (MS) susceptibility was assessed in 542 sib pairs with MS and in their families. By genotyping 1,978 individuals for HLA-DRB1 alleles, we confirmed the well-established association of MS with HLA-DRB1*15 (HLA-DRB1*1501 and HLA-DRB5*0101), by the transmission/disequilibrium test (chi2=138.3; P<.0001). We obtained significant evidence of linkage throughout the whole data set (mlod=4.09; 59.9% sharing). Surprisingly, similar sharing was also observed in 58 families in which both parents lacked the DRB1*15 allele (mlod=1.56; 62.7% sharing; P=.0081). Our findings suggest that the notion that HLA-DRB1*15 is the sole major-histocompatibility-complex determinant of susceptibility in northern-European populations with MS may be incorrect. It remains possible that the association of MS with HLA-DRB1*15 is due to linkage disequilibrium with a nearby locus and/or to the presence of disease-influencing allele(s) in DRB1*15-negative haplotypes.

PMID:
11519010
[PubMed - indexed for MEDLINE]
PMCID:
PMC1226077
Free PMC Article
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