FOXO6 Gene - Function, Expression, Mutations & Disease Associations

FOXO6 is a member of the forkhead box O (FOXO) family of transcription factors, characterized by a conserved forkhead DNA-binding domain. It regulates gene expression involved in cellular metabolism, oxidative stress response, cell cycle arrest, and apoptosis. FOXO6 is predominantly expressed in the brain and liver, and its activity is modulated by post-translational modifications including phosphorylation and acetylation. Dysregulation of FOXO6 has been implicated in metabolic disorders, neurodegenerative diseases, and several cancers.

Tissue Expression

Cell Line Expression

Hotspot Mutations

Mutation functional classification

• PI3K-Akt signaling pathway (hsa04151)

• FoxO signaling pathway (hsa04068)

• Insulin signaling pathway (hsa04910)

• Longevity regulating pathway (hsa04211)

• Hepatocellular carcinoma (hsa05225)

FOXO6 is a 492-amino acid transcription factor with a central forkhead DNA-binding domain. It shuttles between the cytoplasm and nucleus; nuclear localization is regulated by Akt-mediated phosphorylation, which promotes cytoplasmic retention and inactivation. In the nucleus, FOXO6 binds to insulin response elements (IREs) and forkhead response elements (FHREs) to regulate target genes involved in gluconeogenesis (e.g., G6PC, PCK1), cell cycle (e.g., CDKN1B), and oxidative stress (e.g., SOD2, CAT). Post-translational modifications such as acetylation by p300/CBP modulate its transcriptional activity. FOXO6 is highly expressed in brain and liver, and its aberrant activation contributes to tumorigenesis and metabolic dysfunction.