DNA-binding protein that binds to the to a 5'-TGTACAGTGT-3' core sequence. May function as a transcriptional transactivator and transcriptional repressor. Probably exerts its repressor effect by preventing GATA3 from binding to DNA. May play a role in regulating the differentiation and activation of helper T-cells (By similarity). Homodimer (via PTB domain). Interacts with the N-terminal of FANCC. Interacts with ZBTB16. Interacts with GATA3 (By similarity). Located in nuclear speckles. The C-terminal zinc finger domain functions as a transcriptional transactivator. The BTB (POZ) domain possesses repressor activity. Belongs to the krueppel C2H2-type zinc-finger protein family.