HLA class II‐associated genetic susceptibility in multiple sclerosis: A critical evaluation

Wiley - Tập 38 Số 2 - Trang 1-15 - 1991
Olle Olerup1,2, Jan Hillert1,3
1Center for BioTechnology. Karolinska Institute, NOVUM. Huddinge
2Department of Clinical Immunology and
3Department of Neurology, Karolinska Institute at Huddinge Hospital, huddinge, Sweden

Tóm tắt

Abstract: Multiple sclerosis (MS) has, since the 1970s, been known to be associated with the HLA‐Dw2 and ‐DR2 specificities in Caucasian Europeans and North Americans. By the use of genomic typing techniques, the association has been specified to be with the DRwlS,DQw6,Dw2, i.e. the DRBI* 1501‐DQAI*0102‐DQBl*0602 haplotype. A significant DPw4 association in Scandinavian MS patients has been described in one report. However, this association has not been confirmed in several subsequent studies with patients from the same and other ethnic groups. During the last few years several reports, based on serological, RFLP and PCR‐SSO data, have suggested that the HLA class II‐associated MS susceptibility gene(s) may be more closely associated with the DQ than with the DR subregion. The observations that the HLA‐DQBI genes of MS patients share long stretches of sequence motifs and also carry DQA1 alleles encoding glutamine at position 34 of the DQ α chain have received considerable attention. It has been suggested that the susceptibility to develop MS might be determined by the corresponding DQ α‐β heterodimers either encoded in cis or in trans. We have investigated these issues in a large group of Swedish MS patients (n= 179). We found that the associations with the suggested DQBI sequences and position 34 of the DQ α chain were due to linkage disequilibrium and secondary to the association with the DRw15,DQw6,Dw2 haplotype (p < 10‐9 and p < 10‐8, respectively). No overrepresentation of the implicated DQ α‐β heterodimers was observed in DRw1S,DQw6,Dw2‐negative patients. We conclude that available data does not allow the localization of the HLA class II‐associated MS susceptibility genes within the DRw15,DQw6,I>w2 haplotype. We have previously described immunogenetic differences between different clinical forms of MS. In the present study of a new group of MS patients compared with a new control panel, these differences were partly confirmed. The DRw17,DQw2 association in relapsing/remitting MS was affirmed. However, in patients with primarily chronic progressive MS a negative association with the DQw7 allele was not substantiated and a positive association with the DR4.DQw8 haplotype could neither be confirmed nor rejected.

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