ATXN1 (Ataxin 1): ATXN1 is a gene that encodes the ataxin-1 protein, which is involved in neuronal function. Mutations in ATXN1, particularly those with expanded CAG repeats, cause spinocerebellar ataxia type 1 (SCA1)—a neurodegenerative disorder characterized by progressive loss of motor coordination and balance. Researching ATXN1 is crucial for understanding SCA1 and developing potential treatments for related neurological conditions.