Impaired function is a common feature of neuropathy-associated glycyl-tRNA synthetase mutations

Laurie B. Griffin, Reiko Sakaguchi, David Mcguigan, Michael A. Gonzalez, Charles Searby, Stephan Züchner, Ya Ming Hou, Anthony Antonellis

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Charcot-Marie-Tooth disease type 2D (CMT2D) is an autosomal-dominant axonal peripheral neuropathy characterized by impaired motor and sensory function in the distal extremities. Mutations in the glycyl-tRNA synthetase (GARS) gene cause CMT2D. GARS is a member of the ubiquitously expressed aminoacyl-tRNA synthetase (ARS) family and is responsible for charging tRNA with glycine. To date, 13 GARS mutations have been identified in patients with CMT disease. While functional studies have revealed loss-of-function characteristics, only four GARS mutations have been rigorously studied. Here, we report the functional evaluation of nine CMT-associated GARS mutations in tRNA charging, yeast complementation, and subcellular localization assays. Our results demonstrate that impaired function is a common characteristic of CMT-associated GARS mutations. Additionally, one mutation previously associated with CMT disease (p.Ser581Leu) does not demonstrate impaired function, was identified in the general population, and failed to segregate with disease in two newly identified families with CMT disease. Thus, we propose that this variant is not a disease-causing mutation. Together, our data indicate that impaired function is a key component of GARS-mediated CMT disease and emphasize the need for careful genetic and functional evaluation before implicating a variant in disease onset.

Original languageEnglish (US)
Pages (from-to)1363-1371
Number of pages9
JournalHuman mutation
Volume35
Issue number11
DOIs
StatePublished - Nov 1 2014

Keywords

  • Aminoacyl-tRNA synthetase
  • Charcot-Marie-Tooth disease
  • GARS
  • Glycyl-tRNA synthetase
  • Peripheral neuropathy

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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    Griffin, L. B., Sakaguchi, R., Mcguigan, D., Gonzalez, M. A., Searby, C., Züchner, S., Hou, Y. M., & Antonellis, A. (2014). Impaired function is a common feature of neuropathy-associated glycyl-tRNA synthetase mutations. Human mutation, 35(11), 1363-1371. https://doi.org/10.1002/humu.22681