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Unstable mutants in the peripheral endosomal membrane component ALS2 cause early-onset motor neuron disease.

Authors
  • 1
Type
Published Article
Journal
Proceedings of the National Academy of Sciences of the United States of America
Publication Date
Volume
100
Issue
26
Pages
16041–16046
Identifiers
PMID: 14668431
Source
Medline

Abstract

Mutations in ALS2, carrying three putative guanine exchange factor (GEF) domains, are causative for a juvenile, autosomal recessive form of amyotrophic lateral sclerosis (ALS), primary lateral sclerosis, and infantile-ascending hereditary spastic paralysis. Endogenous ALS2 is shown here to be enriched in nervous tissue and to be peripherally bound to the cytoplasmic face of endosomal membranes, an association that requires the amino-terminal "RCC1 (regulator of chromatin condensation)-like" GEF domain. Disease-causing mutants and a naturally truncated isoform of ALS2 are shown to be rapidly degraded when expressed in cultured human cells, including lymphocytes derived from patients with ALS2 mutations. Thus, mutations in the ALS2 gene linked to early-onset motor neuron disease uniformly produce loss of activity through decreased protein stability of this endosomal GEF.

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