ATP8A2 and aceruloplasminemia: Mutations in the gene encoding ATP8A2 have been linked to the neurodevelopmental disorder known as cerebellar ataxia, impaired intellectual development and disequilibrium syndrome 4 (CAMRQ4) (Heidari et al., 2021; Martin-Hernandez et al., 2016; McMillan et al., 2018; Onat et al., 2013).