HLA class II polymorphism in Saudi patients with multiple sclerosis.

Area of Science:

• Immunogenetics
• Neurology
• Human Genetics

Background:

• Multiple sclerosis (MS) is a complex autoimmune disease with known associations to Human Leukocyte Antigen (HLA) genes.
• Previous research has explored HLA associations with MS globally, but high-resolution HLA typing data from the Saudi population remains limited.

Purpose of the Study:

• To investigate the association of specific HLA class II alleles with MS in the Saudi population.
• To explore the correlation between identified HLA alleles and clinical characteristics, including relapse history and vitamin D levels.

Main Methods:

• Employed next-generation sequencing for high-resolution HLA typing.
• Conducted the study at King Abdulaziz Medical City in Riyadh, Saudi Arabia.
• Analyzed the association of HLA class II alleles (HLA-DRB1, DQB1) with MS and clinical parameters.

Main Results:

• Identified significant associations between several HLA-DRB1 and DQB1 alleles and MS in Saudis.
• HLA-DRB1*15:01 showed a strong association with increased MS risk (OR: 3.01) and a higher likelihood of previous relapses.
• HLA-DQB1*02:01, HLA-DQB1*06:02, and HLA-DQB1*06:03 were also significantly associated with MS risk.
• HLA-DRB1*15:01 and HLA-DQB1*06:02 were linked to lower vitamin D levels.

Conclusions:

• This study establishes specific HLA class II allele associations with MS in the Saudi population.
• The findings highlight HLA-DRB1*15:01 as a risk factor for MS and relapses, and link it with reduced vitamin D levels.
• These genetic insights may inform personalized clinical management strategies for MS patients in Saudi Arabia based on their HLA profile.