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De Novo and Bi-allelic Pathogenic Variants in NARS1 Cause Neurodevelopmental Delay Due to Toxic Gain-of-Function and Partial Loss-of-Function Effects

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Aminoacyl-tRNA synthetases (ARSs) are ubiquitous, ancient enzymes that charge amino acids to cognate tRNA molecules, the essential first step of protein translation. Here, we describe 32 individuals from 21 families, presenting with microcephaly, neurodevelopmental delay, seizures, peripheral neuropathy, and ataxia, with de novo heterozygous and bi-allelic mutations in asparaginyl-tRNA synthetase (NARS1). We demonstrate a reduction in NARS1 mRNA expression as well as in NARS1 enzyme levels and activity in both individual fibroblasts and induced neural progenitor cells (iNPCs). Molecular modeling of the recessive c.1633C>T (p.Arg545Cys) variant shows weaker spatial positioning and tRNA selectivity. We conclude that de novo and bi-allelic mutations in NARS1 are a significant cause of neurodevelopmental disease, where the mechanism for de novo variants could be toxic gain-of-function and for recessive variants, partial loss-of-function.

Original languageEnglish
JournalAmerican Journal of Human Genetics
Volume107
Issue number2
Pages (from-to)311-324
Number of pages14
ISSN0002-9297
DOIs
Publication statusPublished - 6 Aug 2020

    Research areas

  • Alleles, Amino Acyl-tRNA Synthetases/genetics, Aspartate-tRNA Ligase/genetics, Cell Line, Female, Gain of Function Mutation/genetics, Genetic Predisposition to Disease/genetics, Humans, Loss of Function Mutation/genetics, Male, Neurodevelopmental Disorders/genetics, Pedigree, RNA, Transfer/genetics, RNA, Transfer, Amino Acyl/genetics, Stem Cells/physiology

ID: 61319109