Abstract:
:Aminoacyl-transfer ribonucleic acid (RNA) synthetases (ARSs) are a group of enzymes required for the first step of protein translation. Each aminoacyl-transfer RNA synthetase links a specific amino acid to its corresponding transfer RNA component within the cytoplasm, mitochondria, or both. Mutations in ARSs have been linked to a growing number of diseases. Lysyl-transfer RNA synthetase (KARS) links the amino acid lysine to its cognate transfer RNA. We report 2 siblings with severe infantile visual loss, progressive microcephaly, developmental delay, seizures, and abnormal subcortical white matter. Exome sequencing identified mutations within the KARS gene (NM_005548.2):c.1312C>T; p.Arg438Trp and c.1573G>A; p.Glu525Lys occurring within a highly conserved region of the catalytic domain. Our patients' phenotype is remarkably similar to a phenotype recently reported in glutaminyl-transfer RNA synthetase (QARS), another bifunctional ARS gene. This finding expands the phenotypic spectrum associated with mutations in KARS and draws attention to aminoacyl-transfer RNA synthetase as a group of enzymes that are increasingly being implicated in human disease.
journal_name
J Child Neuroljournal_title
Journal of child neurologyauthors
McMillan HJ,Humphreys P,Smith A,Schwartzentruber J,Chakraborty P,Bulman DE,Beaulieu CL,FORGE Canada Consortium.,Majewski J,Boycott KM,Geraghty MTdoi
10.1177/0883073814553272subject
Has Abstractpub_date
2015-07-01 00:00:00pages
1037-43issue
8eissn
0883-0738issn
1708-8283pii
0883073814553272journal_volume
30pub_type
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