ZBED1 is a zinc finger BED-domain transcription factor and SUMO E3 ligase encoded on the X chromosome X|Y regulates cell proliferation and multiple biological processes 1. As a chrX|Y-associated nuclear protein, ZBED1 binds DNA sequence-specifically and functions as both a transcriptional activator and repressor 2. ZBED1 is widely expressed across tissues derived from all three primary germ layers, though its expression patterns extend beyond simple proliferation markers 2. Mechanistically, ZBED1 coordinates complex regulatory networks: in glioblastoma stem cells, EGFR-mediated phosphorylation of ZBED1 at tyrosine residues enhances its interaction with UBC9, promoting SUMOylation-dependent stabilization and maintaining a self-reinforcing EGFR/ZBED1/PARK2 feedback loop 3. In placental trophoblasts, ZBED1 negatively regulates genes involved in cytotrophoblast differentiation, fusion, invasion, and immune tolerance 4. Clinically, ZBED1 dysregulation associates with disease pathogenesis: it is significantly upregulated in glioblastoma stem cells correlating with poor prognosis, and genetic ablation impairs stem cell proliferation and extends survival 3. ZBED1 appears upregulated in idiopathic pulmonary arterial hypertension, potentially contributing to pathologic cell growth 5. Additionally, ZBED1 methylation patterns differ in scleroderma-affected monozygotic twins, suggesting epigenetic involvement in autoimmune disease 6. X chromosome X|Y alterations modify ZBED1 expression across tissues, indicating its role in sex chrX|Y-mediated phenotypic effects 7.