Transcription factor involved in epidermis differentiation. Required for terminal epidermal differentiation: acts downstream of p63/TP63 and activates expression of late epidermal differentiation genes. Specifically binds to the promoter of KLF4 and promotes its expression. Expressed in the skin, prostate, lung, placenta and thymus, and at low level in T-cells. Not expressed in peripheral blood leukocytes, pancreas and brain. Clearly expressed in primary keratinocytes but not in fibroblasts. During epidermal differentiation: expression is activated by p63/TP63. The disease is caused by variants affecting the gene represented in this entry.