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• W3200956161 abstract "Biallelic variants in the TBCK gene cause intellectual disability with remarkable clinical variability, ranging from static encephalopathy to progressive neurodegeneration (TBCK-Encephaloneuronopathy). The biological factors underlying variable disease penetrance remain unknown. Since previous studies had suggested aberrant autophagy, we tested whether mitophagy and mitochondrial function are altered in TBCK-/- fibroblasts derived from patients exhibiting variable clinical severity. Our data show significant accumulation of mitophagosomes, reduced mitochondrial respiratory capacity and mitochondrial DNA content, suggesting impaired mitochondrial quality control. Furthermore, the degree of mitochondrial dysfunction correlates with a neurodegenerative clinical course. Since mitophagy ultimately depends on lysosomal degradation, we also examined lysosomal function. Our data show that lysosomal proteolytic function is significantly reduced in TBCK-/- fibroblasts. Moreover, acidifying lysosomal nanoparticles rescue the mitochondrial respiratory defects in fibroblasts, suggesting impaired mitochondrial quality control secondary to lysosomal dysfunction. Our data provide insight into the disease mechanisms of TBCK Encephaloneuronopathy and the potential relevance of mitochondrial function as a biomarker beyond primary mitochondrial disorders. It also supports the benefit of lysosomal acidification strategies for disorders of impaired lysosomal degradation affecting mitochondrial quality control." @default.
• W3200956161 created "2021-09-27" @default.
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• W3200956161 date "2021-09-16" @default.
• W3200956161 modified "2023-09-23" @default.
• W3200956161 title "Lysosomal dysfunction impairs mitochondrial quality control and is associated with neurodegeneration in <i>TBCK</i> encephaloneuronopathy" @default.
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• W3200956161 doi "https://doi.org/10.1093/braincomms/fcab215" @default.
• W3200956161 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8603245" @default.
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• W3200956161 hasPublicationYear "2021" @default.
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