Most of the 19 mitochondrial aminoacyl-tRNA synthetases (mt-aaRSs) involved in mitochondrial protein synthesis are already linked to specific entities, one of the exceptions being PARS2 mutations for which pathogenic significance is not finally validated. The aim of the study was to characterize the PARS2- related phenotype.
Three siblings with biallelic PARS2 mutations presented from birth with infantile spasms, secondary microcephaly, and similar facial dysmorphy. Mental development was deeply impaired with speech absence and no eye contact. A dilated cardiomyopathy and multiorgan failure developed in childhood at the terminal stage, together with mitochondrial dysfunction triggered by valproate administration.
Brain MRI showed progressive volume loss of the frontal lobes, both cortical and subcortical, with widening of the cortical sulci and frontal horns of the lateral ventricles. Hypoplasia of the corpus callosum and progressive demyelination were additional findings. Similar brain features were seen in three already reported PARS2 patients and seemed specific for this defect when compared with other mt-aaRSs defects (DARS2, EARS2, IARS2, and RARS2).
Striking resemblance of the phenotype and Alpers-like brain MRI changes with predominance of frontal cerebral volume loss (FCVL-AS) in six patients from three families of different ethnicity with PARS2 mutations, justifies to distinguish the condition as a new disease entity.
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This work was supported by the CMHI grants 134/13, 136/13, 216/12 and EU Structural Funds, project POIG.02.01.00-14-059/09. ML and DP are supported by the Polish National Science Centre (Grant Number 2014/15/B/ST6/05082) and Foundation for Polish Science (TEAM to DP).
Conflict of interest
The author declare that they have no conflict of interest.
Elżbieta Ciara, Dariusz Rokicki, and Michal Lazniewski contributed equally to this work.
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Ciara, E., Rokicki, D., Lazniewski, M. et al. Clinical and molecular characteristics of newly reported mitochondrial disease entity caused by biallelic PARS2 mutations. J Hum Genet 63, 473–485 (2018). https://doi.org/10.1038/s10038-017-0401-z
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