Enables DNA-binding transcription activator activity, RNA polymerase II-specific. Acts upstream of or within muscle organ development; regulation of transcription, DNA-templated; and somitogenesis. Predicted to be located in nucleus. Is expressed in several structures, including esophagus; ganglia; limb; paraxial mesenchyme; and skeletal musculature. Human ortholog(s) of this gene implicated in congenital structural myopathy. Orthologous to human MYF6 (myogenic factor 6). [provided by Alliance of Genome Resources, Apr 2022]