Congenital Visual Impairment and Progressive Microcephaly Due to Lysyl-Transfer Ribonucleic Acid (RNA) Synthetase (KARS) Mutations: The Expanding Phenotype of Aminoacyl-Transfer RNA Synthetase Mutations in Human Disease.

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 Neurol

authors

McMillan HJ,Humphreys P,Smith A,Schwartzentruber J,Chakraborty P,Bulman DE,Beaulieu CL,FORGE Canada Consortium.,Majewski J,Boycott KM,Geraghty MT

doi

10.1177/0883073814553272

subject

Has Abstract

pub_date

2015-07-01 00:00:00

pages

1037-43

issue

8

eissn

0883-0738

issn

1708-8283

pii

0883073814553272

journal_volume

30

pub_type

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