The function of POU4F3 (POU class 4 homeobox 3, ENSG00000091010) is as follows. Acts as a transcriptional activator (PubMed:18228599). Acts by binding to sequences related to the consensus octamer motif 5'- ATGCAAAT-3' in the regulatory regions of its target genes (PubMed:18228599). Involved in the auditory system development, required for terminal differentiation of hair cells in the inner ear (By similarity). {ECO:0000250|UniProtKB:Q63955, ECO:0000269|PubMed:18228599}.