Impact of Mutations in Aminoacyl tRNA Synthetases on Protein Translation and Cellular Stress

Mutations in the genes encoding cytosolic aminoacyl-tRNA synthetases are responsible for early-onset multisystemic diseases including to varying degrees interstitial lung disease, liver damage, neurological and digestive disorders, and systemic inflammation. These are rare and severe diseases whose pathophysiology is poorly understood. The investigative team hypothesizes that mutations within these genes are responsible for a decrease in protein translation and lead to a cellular stress response similar to that induced by amino acid deprivation. The investigative team also hypothesizes that these alterations could be corrected by high-dose supplementation in the culture medium of the corresponding amino acid. The main objective of the study is to precisely determine the consequences of cytosolic aminoacyl-tRNA synthetase mutations at the cell level on protein translation.