POU domain, class 3, transcription factor 4 (POU3F4)

POU domain, class 3, transcription factor 4 (POU3F4) is a neural transcription factor encoded by the POU3F4 gene on the X chromosome. It belongs to the family of POU homeodomain transcription factors, containing both a POU-specific domain and a homeodomain that mediate sequence-specific DNA binding and gene regulation. POU3F4 functions primarily during early neural and inner ear development, influencing cell type specification in the central nervous system and differentiation of the mesenchyme surrounding the inner ear. Mutations in POU3F4 cause X-linked non-syndromic hearing loss (DFNX2, also called DFN3) by disrupting development of the inner and middle ear. Defects in POU3F4 lead to characteristic radiological anomalies of the cochlea and internal auditory canal, and genetic diagnosis is used for patient selection and surgical management (such as risk mitigation for "gusher" events during cochlear implantation). POU3F4 itself is not a therapeutic target in terms of being the direct molecular target of drugs; instead, gene mutation status guides intervention strategies and genetic counseling for hearing loss syndromes.

Other names

POU Class 3 Homeobox 4Brain 4 (BRN4)DFN3DFNX2

Not applicable; POU3F4 is not directly targeted by drugs, but loss-of-function mutations disrupt transcriptional regulation required for normal ear and neural development