Transcriptional regulator. Involved in the initiation of neuronal differentiation. Activates transcription by binding to the E box (5'-CANNTG-3') (By similarity). May be involved in the functional network that regulates the development of the GnRH axis (PubMed:32620954). {ECO:0000250|UniProtKB:Q61286, ECO:0000269|PubMed:32620954}. This is the function of TCF12 (transcription factor 12, ENSG00000140262).