Fast multiple sclerosis progression in North Africans: Both genetics and environment matter

Area of Science:

• Neurology
• Epidemiology
• Immunology

Background:

• Multiple sclerosis (MS) is a chronic autoimmune disease affecting the central nervous system.
• Geographical variations in MS prevalence and severity suggest environmental and genetic influences.

Purpose of the Study:

• To compare disability progression in multiple sclerosis (MS) among North Africans (NAs) living in France (NAF) and Tunisia (NAT) versus Caucasian patients in France (CF).

Main Methods:

• Retrospective study of 462 MS patients (171 CF, 151 NAT, 140 NAF).
• Analysis of time to disability milestones (EDSS 3, 4, 6) using log-rank tests.
• Cox proportional hazard models to identify factors influencing progression.

Main Results:

• North African patients in France (NAF) showed significantly faster progression to EDSS 3, 4, and 6.
• The second-generation NA group had an earlier age of onset and faster progression in relapsing-remitting MS.
• NA ethnicity was a significant predictor of rapid MS progression, independent of covariates.

Conclusions:

• Multiple sclerosis (MS) exhibits greater severity in North African populations.
• MS severity is particularly pronounced in second-generation North Africans residing in France.