Predicted to enable DNA-binding transcription factor activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Acts upstream of or within eye morphogenesis; negative regulation of retinal cell programmed cell death; and positive regulation of transcription by RNA polymerase II. Predicted to be active in nucleus. Is expressed in several structures, including brain; branchial arch; limb; maxillary process; and urinary system. Orthologous to human BHLHE23 (basic helix-loop-helix family member e23). [provided by Alliance of Genome Resources, Apr 2022]