Forkhead box protein Q1 (FOXQ1)

Forkhead box protein Q1 (FOXQ1) is a member of the large forkhead (FOX) family of transcription factors, characterized by a conserved winged-helix DNA-binding domain[4][7][8]. FOXQ1 regulates key biological processes including cell proliferation, differentiation (notably in hair follicles), cell cycle control, epithelial differentiation, embryonic development, and mitochondrial metabolism in specialized cells such as brain endothelial cells[1][2][5][6]. It is best known for its roles in cancer progression, where FOXQ1 overexpression promotes epithelial to mesenchymal transition (EMT), enhances tumor proliferation, inhibits apoptosis, regulates autophagy, and maintains cancer stem-like cell populations[1][3][5]. FOXQ1 can directly recruit epigenetic complexes such as the MLL (KMT2) histone methyltransferase complex to activate transcriptional programs underlying EMT and metastasis[3]. FOXQ1 is also implicated in non-cancer roles, including ensuring proper barrier and metabolic functions in brain endothelium[2]. Its dysregulation is linked to various cancers and rare ectodermal disorders involving hair and nail development[7]. Despite being considered a potential therapeutic target in oncology, there are currently no approved drugs that directly inhibit FOXQ1.

Other names

Forkhead box Q1FOXQ1HFH1HFH-1HNF-3/forkhead-like protein 1hepatocyte nuclear factor 3 forkhead homolog 1winged helix/forkhead transcription factorForkhead box protein Q1

Agents that inhibit FOXQ1-related pathways may act by suppressing FOXQ1-driven transcription programs, reversing EMT, altering cancer stem cell maintenance, or influencing autophagy and apoptosis regulatory networks[3][5].