Enables chromatin binding activity and transcription corepressor activity. Acts upstream of or within animal organ development and regulation of transcription, DNA-templated. Located in several cellular components, including cytoskeleton; cytosol; and membrane raft. Is expressed in brain; heart; liver; lung; and metanephros. Used to study autosomal recessive polycystic kidney disease. Orthologous to human CYS1 (cystin 1). [provided by Alliance of Genome Resources, Apr 2022]