Enables DNA-binding transcription repressor activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Acts upstream of or within negative regulation of transcription by RNA polymerase II. Predicted to be located in cytosol; fibrillar center; and plasma membrane. Predicted to be active in nucleus. Is expressed in brain. Human ortholog(s) of this gene implicated in autosomal recessive non-syndromic intellectual disability and intellectual disability. Orthologous to human CC2D1A (coiled-coil and C2 domain containing 1A). [provided by Alliance of Genome Resources, Apr 2022]