ATXN1 (Ataxin 1): ATXN1 encodes a protein called ataxin-1, which is involved in neuronal function. Mutations in this gene, particularly expanded CAG repeats, cause spinocerebellar ataxia type 1 (SCA1), a neurodegenerative disorder characterized by loss of motor coordination and balance. Research into ATXN1 is crucial for understanding and developing treatments for this and similar neurodegenerative diseases....