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

Area of Science:

• Immunogenetics
• Neurology
• Human Genetics

Background:

• Multiple sclerosis (MS) prevalence is associated with the major histocompatibility complex (MHC) class II DR15 haplotype, specifically HLA-DRB1*15:01∼HLA-DRB5*01:01.
• Understanding the genetic underpinnings of MS is crucial for developing targeted therapies.

Purpose of the Study:

• To investigate the association between the main MS susceptibility haplotype, HLA-DRB1*15:01∼HLA-DRB5*01:01, and the progression of multiple sclerosis.
• To determine if specific genetic markers influence the clinical course of MS.

Main Methods:

• Genotyping of HLA-DRB1 and HLA-DRB5 in 1230 patients with MS and 2110 healthy controls.
• Assessment of baseline Expanded Disability Status Scale (EDSS) scores and follow-up of patients for at least 3 years to evaluate disease progression.

Main Results:

• The susceptibility allele HLA-DRB1*15:01 was significantly more frequent in patients with clinical isolated syndrome (OR 1.56) and multiple sclerosis (OR 3.17) compared to controls.
• Patients with MS positive for the HLA-DRB1*15:01∼HLA-DRB5*01:01 haplotype showed increased baseline EDSS scores, longer disease duration, and a higher frequency of secondary progressive MS with relapses.

Conclusions:

• The study confirms HLA-DRB1*15:01 and HLA-DRB5*01:01 as key susceptibility alleles for multiple sclerosis.
• Preliminary evidence suggests a potential indirect role for this haplotype in influencing the progression of multiple sclerosis.