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A bi-allelic loss-of-function SARS1 variant in children with neurodevelopmental delay, deafness, cardiomyopathy, and decompensation during fever.

Jean-Marie RavelNatacha DreumontPauline MoscaDesiree E C SmithMarisa I MendesArnaud WiedemannDavid CoelhoEmmanuelle SchmittJean-Baptiste RivièreFrédéric Tran Mau ThemJulien ThevenonPaul KuentzMarc PolivkaSabine A FuchsGautam KokChristel Thauvin-RobinetJean-Louis GuéantGajja S SalomonsLaurence FaivreFrançois Feillet
Published in: Human mutation (2021)
Aminoacyl-tRNA synthetases (aaRS) are ubiquitously expressed enzymes responsible for ligating amino acids to their cognate tRNA molecules through an aminoacylation reaction. The resulting aminoacyl-tRNA is delivered to ribosome elongation factors to participate in protein synthesis. Seryl-tRNA synthetase (SARS1) is one of the cytosolic aaRSs and catalyzes serine attachment to tRNASer . SARS1 deficiency has already been associated with moderate intellectual disability, ataxia, muscle weakness, and seizure in one family. We describe here a new clinical presentation including developmental delay, central deafness, cardiomyopathy, and metabolic decompensation during fever leading to death, in a consanguineous Turkish family, with biallelic variants (c.638G>T, p.(Arg213Leu)) in SARS1. This missense variant was shown to lead to protein instability, resulting in reduced protein level and enzymatic activity. Our results describe a new clinical entity and expand the clinical and mutational spectrum of SARS1 and aaRS deficiencies.
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