Forkhead box protein I1 (FOXI1)

Forkhead box protein I1 (FOXI1) is a member of the forkhead box (FOX) transcription factor family, characterized by a conserved forkhead DNA-binding domain. FOXI1 plays crucial roles in the development, differentiation, and function of multiple epithelial tissues, primarily by regulating the expression of genes involved in ion transport and homeostasis, such as vacuolar H⁺-ATPase subunits and SLC26A4 (pendrin). It is essential for proper cochlear, vestibular, renal, and epididymal function, and its absence or dysfunction leads to sensorineural hearing loss, balance deficits, and developmental abnormalities, such as Pendred syndrome and enlarged vestibular aqueduct. FOXI1 is also implicated in modulating chromatin structure, remaining bound to condensed chromosomes during mitosis and influencing gene accessibility. In cancer, FOXI1 shows tumor suppressive activity by activating specific signaling pathways in gastric cancer and serves as a diagnostic marker to distinguish renal tumor subtypes. No drugs are currently known to directly modify FOXI1 activity, and most clinical or pathological relevance is associated with its function or expression levels.

Other names

FKHL10FREAC6FREAC-6HFH-3HNF-3/fork-head homolog 3FKH10HFH3forkhead box protein I1HNF-3/fork-head homolog-3forkhead-like 10forkhead-related activator 6forkhead-related protein FKHL10forkhead-related transcription factor 6hepatocyte nuclear factor 3 forkhead homolog 3