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Acts as a transcriptional repressor of the GATA3 promoter. Sequence-specific DNA-binding factor that binds to the 5'-AGGTCTC-3' sequence within the negative cis-acting element intronic regulatory region(IRR) of the GATA3 gene(By similarity). Component of the little elongation complex(LEC), a complex required to regulate small nuclear RNA(snRNA) gene transcription by RNA polymerase II and III(PubMed:23932780). Induces thymocyte apoptosis when overexpressed, which may indicate a role in regulation of thymocyte homeostasis.