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000281509 1001_ $$aBrücke, Christof$$b0
000281509 245__ $$aA novel alpha-synuclein G14R missense variant is associated with atypical neuropathological features.
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000281509 520__ $$aParkinson's disease (PD) affects millions of people worldwide, but only 5-10% of patients suffer from a monogenic forms of the disease with Mendelian inheritance. SNCA, the gene encoding for the protein alpha-synuclein (aSyn), was the first to be associated with familial forms of PD and, since then, several missense variants and multiplications of the gene have been established as rare causes of autosomal dominant forms of PD. In this study, we report the identification of a novel SNCA mutation in a patient that presented with a complex neurogenerative disorder, and unconventional neuropathological findings. We also performed in depth molecular studies of the effects of the novel aSyn mutation.A patient carrying the novel aSyn missense mutation and the family members were studied. We present the clinical features, genetic testing-whole exome sequencing (WES), and neuropathological findings. The functional consequences of this aSyn variant were extensively investigated using biochemical, biophysical, and cellular assays.The patient exhibited a complex neurodegenerative disease that included generalized myocloni, bradykinesia, dystonia of the left arm and apraxia. WES identified a novel heterozygous SNCA variant (cDNA 40G > A; protein G14R). Neuropathological examination showed extensive atypical aSyn pathology with frontotemporal lobar degeneration (FTLD)-type distribution and nigral degeneration pattern with abundant ring-like neuronal inclusions, and few oligodendroglial inclusions. Sanger sequencing confirmed the SNCA variant in one healthy, 86-year-old parent of the patient suggesting incomplete penetrance. NMR studies suggest that the G14R mutation induces a local structural alteration in aSyn, and lower thioflavin T binding in in vitro fibrillization assays. Interestingly, the G14R aSyn fibers display different fibrillar morphologies than Lewy bodies as revealed by cryo-electron microscopy. Cellular studies of the G14R variant revealed increased inclusion formation, enhanced membrane association, and impaired dynamic reversibility of serine-129 phosphorylation.The atypical neuropathological features observed, which are reminiscent of those observed for the G51D aSyn variant, suggest a causal role of the SNCA variant with a distinct clinical and pathological phenotype, which is further supported by the properties of the mutant aSyn.
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000281509 650_7 $$2Other$$aAggregation
000281509 650_7 $$2Other$$aAlpha-synuclein
000281509 650_7 $$2Other$$aBradykinesia
000281509 650_7 $$2Other$$aDystonia
000281509 650_7 $$2Other$$aParkinson´s disease
000281509 650_7 $$2NLM Chemicals$$aalpha-Synuclein
000281509 650_7 $$2NLM Chemicals$$aSNCA protein, human
000281509 650_2 $$2MeSH$$aHumans
000281509 650_2 $$2MeSH$$aalpha-Synuclein: genetics
000281509 650_2 $$2MeSH$$aMutation, Missense: genetics
000281509 650_2 $$2MeSH$$aParkinson Disease: genetics
000281509 650_2 $$2MeSH$$aParkinson Disease: pathology
000281509 650_2 $$2MeSH$$aMale
000281509 650_2 $$2MeSH$$aFemale
000281509 650_2 $$2MeSH$$aPedigree
000281509 650_2 $$2MeSH$$aAged
000281509 650_2 $$2MeSH$$aMiddle Aged
000281509 650_2 $$2MeSH$$aExome Sequencing
000281509 650_2 $$2MeSH$$aBrain: pathology
000281509 7001_ $$aAl-Azzani, Mohammed$$b1
000281509 7001_ $$aRamalingam, Nagendran$$b2
000281509 7001_ $$aRamón, Maria$$b3
000281509 7001_ $$aSousa, Rita L$$b4
000281509 7001_ $$0P:(DE-2719)9002102$$aBuratti, Fiamma$$b5$$udzne
000281509 7001_ $$aZech, Michael$$b6
000281509 7001_ $$aSicking, Kevin$$b7
000281509 7001_ $$aAmaral, Leslie$$b8
000281509 7001_ $$aGelpi, Ellen$$b9
000281509 7001_ $$aChandran, Aswathy$$b10
000281509 7001_ $$aAgarwal, Aishwarya$$b11
000281509 7001_ $$aChaves, Susana R$$b12
000281509 7001_ $$aFernández, Claudio O$$b13
000281509 7001_ $$0P:(DE-2719)9000392$$aDettmer, Ulf$$b14
000281509 7001_ $$aLautenschläger, Janin$$b15
000281509 7001_ $$0P:(DE-2719)2810591$$aZweckstetter, Markus$$b16$$udzne
000281509 7001_ $$aBusnadiego, Ruben Fernandez$$b17
000281509 7001_ $$aZimprich, Alexander$$b18
000281509 7001_ $$0P:(DE-2719)2814138$$aOuteiro, Tiago Fleming$$b19$$eLast author$$udzne
000281509 773__ $$0PERI:(DE-600)2244557-2$$a10.1186/s13024-025-00889-y$$gVol. 20, no. 1, p. 98$$n1$$p98$$tMolecular neurodegeneration$$v20$$x1750-1326$$y2025
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