A recurrent GARS mutation causes distal hereditary motor neuropathy

Area of Science:

• Genetics
• Neurology
• Molecular Biology

Background:

• Charcot-Marie-Tooth disease and related peripheral neuropathies are often genetically heterogeneous.
• Identifying specific gene mutations is crucial for understanding disease mechanisms and developing targeted therapies.

Observation:

• Two unrelated women presented with similar symptoms: motor weakness starting in late childhood, affecting distal limbs.
• Neuropathy was predominantly motor, with slowed motor but not sensory nerve conduction velocities.

Findings:

• A specific mutation, p.Gly327Arg, was identified in the GARS gene in both patients.
• This GARS variant demonstrated impaired protein function in yeast complementation assays, confirming its pathogenicity.
• The mutation was de novo in one patient and suspected in the other, indicating a genetic cause.

Implications:

• The p.Gly327Arg GARS mutation is identified as a cause of distal motor neuropathy.
• This finding advances the understanding of genetic peripheral neuropathies.
• Further research can explore genotype-phenotype correlations and potential therapeutic strategies for GARS-related neuropathies.