Title: Recessive amyotrophic lateral sclerosis families with the D90A SOD1 mutation share a common founder: evidence for a linked protective factor
Authors: Al-Chalabi, A ×
Andersen, P M
Chioza, B
Shaw, C
Sham, P C
Robberecht, Wim
Matthijs, Gert
Camu, W
Marklund, S L
Forsgren, L
Rouleau, G
Laing, N G
Hurse, P V
Siddique, T
Leigh, P N
Powell, J F #
Issue Date: Jan-1999
Series Title: Human Molecular Genetics vol:7 issue:13 pages:2045-50
Abstract: Amyotrophic lateral sclerosis (ALS) is a progressive motor neurodegeneration resulting in paralysis and death from respiratory failure within 3-5 years. About 20% of familial cases are associated with mutations in the gene for copper/zinc superoxide dismutase ( SOD1 ), which catalyses the dismutation of the superoxide radical to hydrogen peroxide and oxygen. Experimental evidence suggests mutations act by a toxic gain of function but the mechanism is unknown. There are >60 known SOD1 mutations associated with ALS and all are dominant except for one in exon 4, a D90A substitution which is recessive. D90A pedigrees with dominant inheritance have now been reported and this apparent contradiction needs to be explained. We performed a worldwide haplotype study on 28 D90A pedigrees using six highly polymorphic microsatellite markers. We now show that all 20 recessive families share the same founder (alpha = 0.999), regardless of geographical location, whereas several founders exist for the eight dominant families (alpha = 0.385). This finding confirms that D90A can act in a dominant fashion in keeping with all other SOD1 mutations, but that on one occasion, a new instance of this mutation has been recessive. We propose a tightly linked protective factor which modifies the toxic effect of mutant SOD1 in recessive families.
ISSN: 0964-6906
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Research Group Experimental Neurology
Clinical Genetics Section (-)
Laboratory for Neurobiology (Vesalius Research Center)
Department of Human Genetics - miscellaneous
× corresponding author
# (joint) last author

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