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• W4297262019 abstract "Abstract Aminoacyl-tRNA synthetases are essential enzymes responsible for charging amino acids onto cognate tRNAs during protein synthesis. In histidyl-tRNA synthetase (HARS), autosomal dominant mutations V133F, V155G, Y330C and S356N in the HARS catalytic domain cause Charcot–Marie–Tooth disease type 2 W (CMT2W), while tRNA-binding domain mutation Y454S causes recessive Usher syndrome type IIIB. In a yeast model, all human HARS variants complemented a genomic deletion of the yeast ortholog HTS1 at high expression levels. CMT2W associated mutations, but not Y454S, resulted in reduced growth. We show mistranslation of histidine to glutamine and threonine in V155G and S356N but not Y330C mutants in yeast. Mistranslating V155G and S356N mutants lead to accumulation of insoluble proteins, which was rescued by histidine. Mutants V133F and Y330C showed the most significant growth defect and decreased HARS abundance in cells. Here, histidine supplementation led to insoluble protein aggregation and further reduced viability, indicating histidine toxicity associated with these mutants. V133F proteins displayed reduced thermal stability in vitro, which was rescued by tRNA. Our data will inform future treatment options for HARS patients, where histidine supplementation may either have a toxic or compensating effect depending on the nature of the causative HARS variant." @default.
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• W4297262019 date "2022-09-26" @default.
• W4297262019 modified "2023-10-14" @default.
• W4297262019 title "Histidine supplementation can escalate or rescue HARS deficiency in a Charcot–Marie–Tooth disease model" @default.
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• W4297262019 doi "https://doi.org/10.1093/hmg/ddac239" @default.
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