SOD1 gene mutations in ALS patients from British Columbia, Canada: clinical features, neurophysiology and ethical issues in management.
Two hundred and fifty-four ALS patients from British Columbia, Canada were screened for mutations in the gene encoding the enzyme superoxide dismutase type 1 (SOD1). Thirteen patients (5.1%) carried one of six missense mutations (A4V, G72C, D76Y, D90A, C111Y, I113T). Mutations were found both in sporadic and familial ALS cases. Atypical clinical features delayed diagnosis in some cases. The demographic and clinical features of the mutation carrying index cases are summarized, and compared with those of screened patients without mutations. The phenotypic variability between SOD1 mutation carrying patients in this study is dramatic, even among patients with the same mutation This underlines the hypothesis that ALS is a biologically heterogeneous disorder in which genetics, environment and ageing all interrelate to form the final clinical phenotype.
Eisen
Andrew
A
Neuromuscular Diseases Unit, Vancouver General Hospital, and the University of British Columbia, Canada.
Mezei
Michelle M
MM
Stewart
Heather G
HG
Fabros
Marife
M
Gibson
Gillan
G
Andersen
Peter M
PM
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000690:Amyotrophic Lateral Sclerosis / Q000453:epidemiology* / Q000235:genetics* / Q000628:therapy; D001955:British Columbia / Q000453:epidemiology; D002648:Child; D005260:Female; D020022:Genetic Predisposition to Disease / Q000453:epidemiology / Q000235:genetics; D005820:Genetic Testing / Q000941:ethics* / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009154:Mutation; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D013482:Superoxide Dismutase / Q000235:genetics*; D000072105:Superoxide Dismutase-1
C000606290:SOD1 protein, human; D013482:Superoxide Dismutase; D000072105:Superoxide Dismutase-1