Multiple sclerosis (MS) is a complex genetic trait, Analyses to identi
fy genetic variants that increase susceptibility to MS have primarily
focused on candidate genes, either in family linkage investigations or
in association (linkage disequilibrium) studies in sporadic cases and
control subjects, Most of the candidate genes considered to date eith
er influence immune function or encode structural myelin proteins, Rec
ently, three preliminary whole genomic surveys mere completed, and the
y reveal multiple loci of possible genetic linkage that are worthy of
further study, No convincing evidence for a single strong locus has em
erged from analysis of the three studies, Linkage promises to focus th
e future choice of candidate genes for further investigation.