AARS1 and Epileptic encephalopathy: Mutations in alanyl-tRNA synthetase 1 (AARS1) may show two distinct phenotypes with neurological symptoms: (i): epileptic encephalopathy with deficient myelination (DEE29; OMIM# 616239) [34,35]; and (ii): progressive posterior predominant leukoencephalopathy [34,35].