Spinocerebellar ataxia The Spinocerebellar ataxias (also called SCA's) are caused by mutations in different genes. For example, spinocerebellar ataxia 1 is linked to a default in the gene SCA1. Through research, more than 100 types of SCA's have been discovered since 1965. For more information on the different types of Spinocerebellar ataxias, see below: Spinocerebellar ataxia 1 (SCA1) Spinocerebellar ataxia 2 (SCA2) Spinocerebellar ataxia 3 (SCA3) Spinocerebellar ataxia 6 (SCA6)You can also view an illustrated leaflet on SCA6 kindly provided by Health Press Limited. Spinocerebellar ataxia 7 (SCA7) Spinocerebellar ataxia 11 (SCA11)