Probable DNA-binding transcriptional activator. Key determinant of the keratinocyte proliferation-differentiation switch involved in appropriate epidermal development. Plays a role in regulating mammary epithelial cell proliferation. May regulate WDR65 transcription. Interacts with SERPINB5. Expressed in normal mammary epithelial cells. Expression is reduced or absent in breast carcinomas. Belongs to the IRF family. Note: This description may include information from UniProtKB.