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Wortmann, S.B. ; Timal, S.* ; Venselaar, H.* ; Wintjes, L.T.* ; Kopajtich, R. ; Feichtinger, R.G.* ; Onnekink, C.* ; Mühlmeister, M.* ; Brandt, U.* ; Smeitink, J.A.M.* ; Veltman, J.A.* ; Sperl, W.* ; Lefeber, D.J.* ; Pruijn, G.J.M.* ; Stojanovic, V.* ; Freisinger, P.* ; V Spronsen, F.* ; Derks, T.G.* ; Veenstra-Knol, H.E.* ; Mayr, J.A.* ; Rötig, A.* ; Tarnopolsky, M.* ; Prokisch, H. ; Rodenburg, R.J.*

Biallelic variants in WARS2 encoding mitochondrial tryptophanyl-tRNA synthase in six individuals with mitochondrial encephalopathy.

Hum. Mutat. 38, 1786-1795 (2017)
Postprint Research data DOI PMC
Open Access Green
Mitochondrial protein synthesis involves an intricate interplay between mitochondrial DNA encoded RNAs and nuclear DNA encoded proteins, such as ribosomal proteins and aminoacyl-tRNA synthases. Eukaryotic cells contain 17 mitochondria-specific aminoacyl-tRNA synthases. WARS2 encodes mitochondrial tryptophanyl-tRNA synthase (mtTrpRS), a homodimeric class Ic enzyme (mitochondrial tryptophan-tRNA ligase; EC 6.1.1.2). Here, we report six individuals from five families presenting with either severe neonatal onset lactic acidosis, encephalomyopathy and early death or a later onset, more attenuated course of disease with predominating intellectual disability. Respiratory chain enzymes were usually normal in muscle and fibroblasts, while a severe combined respiratory chain deficiency was found in the liver of a severely affected individual. Exome sequencing revealed rare biallelic variants in WARS2 in all affected individuals. An increase of uncharged mitochondrial tRNA(Trp) and a decrease of mtTrpRS protein content were found in fibroblasts of affected individuals. We hereby define the clinical, neuroradiological and metabolic phenotype of WARS2 defects. This confidently implicates that mutations in WARS2 cause mitochondrial disease with a broad spectrum of clinical presentation.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Cox Deficiency ; Lactic Acidosis ; Liver ; Mitochondrial Disorder; Synthetase; Mutations; Deficiency; Leukoencephalopathy; Diagnosis
ISSN (print) / ISBN 1059-7794
e-ISSN 1098-1004
Journal Human Mutation
Quellenangaben Volume: 38, Issue: 12, Pages: 1786-1795 Article Number: , Supplement: ,
Publisher Wiley
Publishing Place Hoboken
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Human Genetics (IHG)