This gene encodes glycyl-tRNA synthetase, one of the aminoacyl-tRNA synthetases that charge tRNAs with their cognate amino acids. The encoded enzyme is an (alpha)2 dimer which belongs to the class II family of tRNA synthetases.
This enzyme belongs to the family of ligases, to be specific those forming carbon-oxygen bonds in aminoacyl-tRNA and related compounds. The systematic name of this enzyme class is glycine:tRNAGly ligase (AMP-forming). Other names in common use include glycyl-tRNA synthetase, glycyl-transfer ribonucleate synthetase, glycyl-transfer RNA synthetase, glycyl-transfer ribonucleic acid synthetase, and glycyl translase. This enzyme participates in glycine, serine and threonine metabolism and aminoacyl-trna biosynthesis.
The peripheral nerve diseases Charcot-Marie-Tooth disease type 2D (CMT2D) and distal spinal muscular atrophy type V (dSMA-V) have been liked to dominant mutations in GARS. CMT2D usually manifests during the teenage years, and results in muscle weakness predominantly in the hands and feet. Two mouse models of CMT2D have been used to better understand the disease, identifying that the disorder is caused by a toxic gain-of-function of the mutant glycine-tRNA ligase protein. The CMT2D mice display peripheral nerve axon degeneration  and defective development and function> of the neuromuscular junction.
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Del Bo R, Locatelli F, Corti S, Scarlato M, Ghezzi S, Prelle A, Fagiolari G, Moggio M, Carpo M, Bresolin N, Comi GP (Mar 2006). "Coexistence of CMT-2D and distal SMA-V phenotypes in an Italian family with a GARS gene mutation". Neurology. 66 (5): 752–4. PMID16534118. doi:10.1212/01.wnl.0000201275.18875.ac.
James PA, Cader MZ, Muntoni F, Childs AM, Crow YJ, Talbot K (Nov 2006). "Severe childhood SMA and axonal CMT due to anticodon binding domain mutations in the GARS gene". Neurology. 67 (9): 1710–2. PMID17101916. doi:10.1212/01.wnl.0000242619.52335.bc.