The National Ataxia Foundation

Coordination of Rare Diseases at Sanford (CoRDS)

U.S. National Library of Medicine Genetics Home Reference on SCA1

U.S. National Library of Medicine Genetics Home Reference on SCA3

U.S. National Library of Medicine Clinical Trials – Clinical Trial Readiness for SCA1 and SCA3 (READISCA) ClinicalTrials.gov Identifier: NCT03487367

European Integrated Project on Spinocerebellar Ataxias (EUROSCA)

Spastic Paraparesis and Ataxia Network (SPATAX)

European Spinocerebellar Ataxia Type 3/Machado-Joseph Disease Initiative (ESMI)