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Mutations in FARS2 are known to cause dysfunction of mitochondrial translation due to deficient aminoacylation of the mitochondrial phenylalanine tRNA. Here, we report three novel mutations in FARS2 found in two patients in a compound heterozygous state. The missense mutation c.1082C>T (p.Pro361Leu) was detected in both patients. The mutations c.461C>T (p.Ala154Val) and c.521_523delTGG (p.Val174del) were each detected in one patient. We report abnormal in vitro aminoacylation assays as a functional validation of the molecular genetic findings. Based on the phenotypic data of previously reported subjects and the two subjects reported here, we conclude that FARS2 deficiency can be associated with two phenotypes: (i) an epileptic phenotype, and (ii) a spastic paraplegia phenotype. Copyright © 2017 The Authors. Published by Elsevier Inc. All rights reserved.


Elise Vantroys, Austin Larson, Marisa Friederich, Kaz Knight, Michael A Swanson, Christopher A Powell, Joél Smet, Sarah Vergult, Boel De Paepe, Sara Seneca, Herbert Roeyers, Björn Menten, Michal Minczuk, Arnaud Vanlander, Johan Van Hove, Rudy Van Coster. New insights into the phenotype of FARS2 deficiency. Molecular genetics and metabolism. 2017 Dec;122(4):172-181

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PMID: 29126765

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