Intron 6 of brain expressed associated with NEDD4‐1 (BEAN1) gene contains around 20 repeats of TGGAA, which expands to > 200 repeats in SCA31 patients (Sato et al, 2009; Niimi et al, 2013; Ishiguro et al, 2017). The gene discussed is BEAN1; the disease is spinocerebellar ataxia type 31.