Interaction between HLA-DR2 and abnormal brain MRI in optic neuritis and early MS. Optic Neuritis Study Group

Area of Science:

• Neuroimmunology
• Genetics
• Radiology

Background:

• Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system.
• Genetic factors, particularly human leukocyte antigen (HLA) alleles, are implicated in MS susceptibility.
• The role of HLA-DR2 in MS development, especially in relation to early imaging findings, requires further elucidation.

Purpose of the Study:

• To investigate the association between the HLA-DR2 allele and the development of MS.
• To examine the relationship between HLA-DR2 and brain MRI signal abnormalities in patients at risk for MS.
• To assess the predictive value of HLA-DR2 for MS conversion in individuals experiencing optic neuritis.

Main Methods:

• Retrospective analysis of 178 patients from the Optic Neuritis Treatment Trial.
• Genotyping for HLA-DR2 allele presence.
• Assessment of brain MRI for signal abnormalities at baseline.
• Follow-up evaluation for the development of probable or definite MS over 5 years.

Main Results:

• The HLA-DR2 allele was present in 48% of the study cohort.
• HLA-DR2 presence was associated with a nearly twofold increased odds of developing MS within 5 years (OR, 1.92; p=0.04).
• This association was particularly significant in patients exhibiting baseline brain MRI signal abnormalities.

Conclusions:

• The HLA-DR2 allele is a significant genetic risk factor for the development of MS.
• Baseline brain MRI abnormalities may identify individuals with HLA-DR2 who are at higher risk for MS.
• These findings highlight the interplay between genetic predisposition and early pathological changes in MS pathogenesis.