Is multiple sclerosis progression associated with the HLA-DR15 haplotype?

BACKGROUND

The prevalence of multiple sclerosis is associated with the major histocompatibility complex class II DR15 haplotype HLA-DRB115:01∼HLA-DRB501:01.

OBJECTIVE

To assess whether multiple sclerosis progression is associated with the main susceptibility haplotype HLA-DRB115:01∼HLA-DRB501:01.

METHODS

Patients ( = 1230) and healthy controls ( = 2110) were genotyped for HLA-DRB1 and HLA-DRB5. The baseline Expanded Disability Status Scale (EDSS) score was determined and patients were followed for at least 3 years.

RESULTS

After follow-up of the consecutive cohort 349 patients were classified as having clinical isolated syndrome and 881 patients as having multiple sclerosis. The susceptibility allele HLA-DRB115:01 was more frequent in clinical isolated syndrome (odds ratio 1.56) and multiple sclerosis (odds ratio 3.17) compared to controls. HLA- DRB115:01 was the only enriched HLA-DRB1 allele in multiple sclerosis patients. Comparison of clinical characteristics between HLA-DRB115:01∼HLA-DRB501:01 negative and positive patients with multiple sclerosis showed that baseline EDSS score, disease duration and frequency of the category secondary progressive multiple sclerosis with relapse were increased in the HLA-DRB115:01∼HLA-DRB501:01 positive group.

CONCLUSION

The study confirmed HLA-DRB115:01 and HLA-DRB501:01 as the main susceptibility alleles and showed weak indirect evidence for a role in progression of the disease.