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- W2510214503 abstract "Munc18-1 is a key component of the exocytic machinery that controls neurotransmitter release. Munc18-1 heterozygous mutations cause developmental defects and epileptic phenotypes, including infantile epileptic encephalopathy (EIEE), suggestive of a gain of pathological function. Here, we used single-molecule analysis, gene-edited cells, and neurons to demonstrate that Munc18-1 EIEE-causing mutants form large polymers that coaggregate wild-type Munc18-1 in vitro and in cells. Surprisingly, Munc18-1 EIEE mutants also form Lewy body-like structures that contain α-synuclein (α-Syn). We reveal that Munc18-1 binds α-Syn, and its EIEE mutants coaggregate α-Syn. Likewise, removal of endogenous Munc18-1 increases the aggregative propensity of α-Syn(WT) and that of the Parkinson's disease-causing α-Syn(A30P) mutant, an effect rescued by Munc18-1(WT) expression, indicative of chaperone activity. Coexpression of the α-Syn(A30P) mutant with Munc18-1 reduced the number of α-Syn(A30P) aggregates. Munc18-1 mutations and haploinsufficiency may therefore trigger a pathogenic gain of function through both the corruption of native Munc18-1 and a perturbed chaperone activity for α-Syn leading to aggregation-induced neurodegeneration." @default.
- W2510214503 created "2016-09-16" @default.
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- W2510214503 date "2016-09-05" @default.
- W2510214503 modified "2023-10-12" @default.
- W2510214503 title "Munc18-1 is a molecular chaperone for α-synuclein, controlling its self-replicating aggregation" @default.
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- W2510214503 doi "https://doi.org/10.1083/jcb.201512016" @default.
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