PGBD4 and autosomal dominant cerebellar ataxia: While preparing this manuscript and after completing the literature search, a U.S.-based GWAS on pediatric SCA patients (n = 467, 97% African American) was published, which identified a new genome-wide significant locus at 15q14 (rs8182015) in the PGBD4-KATNBL1 intergenic region, and confirmed BCL11A (rs1427407 and rs766432) as a key modifier of HbF levels [82].