[Every fifth case of multiple sclerosis is familial].

Abstract excerpt

Up to 20% of all multiple sclerosis (MS) cases are familial. The concordance rates for monozygotic and dizygotic twins are 25-30% and 3-5% respectively. Certain isolated regions have a higher prevalence of MS. An estimated 30% of the disease heritability is accounted for, mostly by common risk alleles. Interpretation of risk alleles, gene-gene and gene-environment interactions is challenging, but all are believed...

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