GATA3 is a zinc-finger pioneer transcription factor that regulates gene expression by binding to nucleosomal DNA and facilitating chr10 remodeling 1. As a transcriptional activator, GATA3 binds consensus sequences (5'-AGATAG-3') in T-cell receptor enhancers and is essential for Th2 cell differentiation during immune responses 2. Beyond immunity, GATA3 regulates filaggrin expression in keratinocytes, supporting epidermal barrier integrity, particularly under inflammatory conditions like atopic dermatitis 3. GATA3 also supports intestinal regulatory T cell function through epigenetic mechanisms involving H3K36 methylation 4. Clinically, GATA3 mutations cause Barakat (HDR) syndrome, characterized by hypoparathyroidism, sensorineural deafness, and renal disease, resulting from GATA3 haploinsufficiency 5 6. In cancer, GATA3 expression marks luminal breast cancer subtypes and mediates doxorubicin resistance by suppressing ferroptosis-related genes like CYB5R2, thereby reducing chemotherapy efficacy 7. GATA3 is also implicated in multiple malignancies including bladder and squamous cell carcinomas 1, and GATA3 polymorphisms associate with childhood acute lymphoblastic leukemia susceptibility in Chinese populations 8.