PPP2R2B and autosomal dominant cerebellar ataxia: In addition, >32-88 CAG repeats lead to autosomal-dominant cerebellar ataxias (ADCAs) when inserted in the exonic regions of the following genes: 1) ataxin (ATXN1, 2, 3 or 7) in SCA types 1-3,7; 2) calcium voltage-gated channel subunit alpha1A (CACNA1A) in SCA6; 3) protein phosphatase 2 regulatory subunit B beta (PPP2R2B) in SCA12; 4) TATA-binding protein (TBP) in SCA17; 5) atrophin 1 (ATN1) in DRPLA; 6) X-linked androgen receptor (AR) in SBMA, 7) potassium calcium-activated channel subfamily N member 3 (KCNN3) in some Schizophrenia/migraines.