G6PD and autosomal dominant cerebellar ataxia: Sickle cell anemia (SCA) is a genetic disorder characterized by a high inter-individual clinical variability partly related to the existence of various genetic modulators such as hemoglobin F (HbF) quantitative trait loci (QTL), alpha-thalassemia, and glucose-6-phosphate dehydrogenase (G6PD) deficiency [1].