RARS1 and leukodystrophy: Biallelic RARS1 variants have been linked to hypomyelination leukodystrophy in 30 cases (Di Bella et al., 2021; Ji et al., 2018; McSherry et al., 2018; Mendes et al., 2020; Nafisinia et al., 2017; Rezaei et al., 2019; Wan et al., 2023; Wolf et al., 2014).