PNPT1 and optic atrophy: Cystic leukoencephalopathy and early-onset hypomyelinating leukodystrophies have also been reported in association with biallelic PNPT1 variants [25,36], as well as severe multisystemic presentations of Leigh syndrome and complex neurodegenerative phenotypes, including myoclonus, choreoathetosis, cerebellar ataxia, and optic atrophy [37,38].