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Multiple sclerosis and HLA class II susceptibility and resistance genes

Probes to the HLA class II genes DRβ, DQβ, and DQα were used to study DNA from unrelated Caucasian multiple sclerosis (MS) patients by sequential restriction fragment length polymorphism (RFLP) analysis in Taq1 restriction enzyme digests. Comparison of 104 patients and 108 controls, who were not matched for DR type, has identified for the first time a linked series of allele‐specific RFLPs or allogenotypes which form an extended haplotype that is preferentially associated with MS. These allogenotypes include DRw15 or DR2(15);DQβlb, which corresponds at the DNA level to the DQwl (DQw6) serotype; a DQA1 allogenotype termed DQα1b; and a 2.2kb DX (DQA2) allogenotype termed DXαU (DQA2U).