Enables DNA binding activity and DNA-binding transcription factor activity. Predicted to be involved in regulation of transcription by RNA polymerase II. Predicted to act upstream of or within regulation of heart contraction. Located in nucleus. Human ortholog(s) of this gene implicated in congenital heart disease and dilated cardiomyopathy. Orthologous to human SP4 (Sp4 transcription factor). [provided by Alliance of Genome Resources, Apr 2022]