Predicted to enable DNA-binding transcription factor activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Predicted to be involved in several processes, including commitment of neuronal cell to specific neuron type in forebrain; regulation of neuron projection development; and regulation of transcription by RNA polymerase II. Predicted to act upstream of or within positive regulation of DNA-templated transcription. Predicted to be active in chromatin and nucleus. Is expressed in margin; nervous system; and shield. Orthologous to human TBR1 (T-box brain transcription factor 1).