A chromatin-binding factor that represses Notch signaling and associates with RNA. Expansion of the polyglutamine tract by expanded CAG repeats in the ATXN1 gene coding region is associated with SPINOCEREBELLAR ATAXIA 1.

Synonyms: Protein, Atxn-1, Ataxin-1, Protein, Atxn1, Ataxin 1 Protein, SCA1 Protein, Spinocerebellar Ataxia Type 1 Protein, Atxn 1 Protein, 0, Protein, SCA1, Ataxin 1, Protein, Ataxin-1, Ataxin-1 Protein, Atxn1 Protein, Atxn-1 Protein