Is SOD1 loss of function involved in amyotrophic lateral sclerosis
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TLDR
There is a possibility that S OD1 loss of function may play a modifying role in amyotrophic lateral sclerosis, and this likelihood has implications for some current therapies aimed at knocking down the level of mutant protein in patients with SOD1–amyotrophicateral sclerosis.Abstract:
Mutations in the gene superoxide dismutase 1 (SOD1) are causative for familial forms of the neurodegenerative disease amyotrophic lateral sclerosis. When the first SOD1 mutations were identified they were postulated to give rise to amyotrophic lateral sclerosis through a loss of function mechanism, but experimental data soon showed that the disease arises from a—still unknown—toxic gain of function, and the possibility that loss of function plays a role in amyotrophic lateral sclerosis pathogenesis was abandoned. Although loss of function is not causative for amyotrophic lateral sclerosis, here we re-examine two decades of evidence regarding whether loss of function may play a modifying role in SOD1–amyotrophic lateral sclerosis. From analysing published data from patients with SOD1–amyotrophic lateral sclerosis, we find a marked loss of SOD1 enzyme activity arising from almost all mutations. We continue to examine functional data from all Sod1 knockout mice and we find obvious detrimental effects within the nervous system with, interestingly, some specificity for the motor system. Here, we bring together historical and recent experimental findings to conclude that there is a possibility that SOD1 loss of function may play a modifying role in amyotrophic lateral sclerosis. This likelihood has implications for some current therapies aimed at knocking down the level of mutant protein in patients with SOD1–amyotrophic lateral sclerosis. Finally, the wide-ranging phenotypes that result from loss of function indicate that SOD1 gene sequences should be screened in diseases other than amyotrophic lateral sclerosis.read more
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References
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Mutations in Cu/Zn superoxide dismutase gene are associated with familial amyotrophic lateral sclerosis
TL;DR: Tight genetic linkage between FALS and a gene that encodes a cytosolic, Cu/Zn-binding superoxide dismutase (SOD1), a homodimeric metalloenzyme that catalyzes the dismutation of the toxic superoxide anion O–2 to O2 and H2O2 is reported.
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Motor neuron degeneration in mice that express a human Cu,Zn superoxide dismutase mutation.
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TL;DR: In this article, the authors found that mutations of human Cu,Zn superoxide dismutase (SOD) contribute to the pathogenesis of familial amyotrophic lateral sclerosis (ALS).
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Superoxide Radical and Superoxide Dismutases
TL;DR: O2- oxidizes the [4Fe-4S] clusters of dehydratases, such as aconitase, causing-inactivation and release of Fe(II), which may then reduce H2O2 to OH- +OH..
Journal ArticleDOI
TDP-43 Mutations in Familial and Sporadic Amyotrophic Lateral Sclerosis
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