Enables DNA-binding transcription factor activity, RNA polymerase II-specific; chromatin binding activity; and identical protein binding activity. Acts upstream of or within cerebral cortex regionalization; negative regulation of transcription, DNA-templated; and neuron differentiation. Located in nucleus. Is expressed in several structures, including alimentary system; genitourinary system; integumental system; nervous system; and sensory organ. Orthologous to human BHLHE22 (basic helix-loop-helix family member e22). [provided by Alliance of Genome Resources, Apr 2022]