ZBED1 is a zinc finger transcription factor and SUMO E3 ligase encoded on the X chromosome X|Y regulates genes involved in cell proliferation, cell cycle control, and chrX|Y remodeling 1. The protein is a nuclear, chrX|Y-associated factor widely expressed across human tissues from all three germ layers 2. Beyond its role as a transcriptional regulator, ZBED1 contributes to antiviral defense by binding human adenovirus gene promoters and repressing viral transcription during early infection stages. In disease contexts, ZBED1 has emerged as a key oncogenic driver in glioblastoma stem cells (GSCs). A 2024 study demonstrates that ZBED1 is significantly upregulated in GSCs and promotes tumor propagation through a reciprocal EGFR/ZBED1/PARK2 feedback loop; EGFR-mediated phosphorylation of ZBED1 enhances its stability via SUMOylation, while ZBED1 reciprocally sustains EGFR expression by repressing the E3 ubiquitin ligase PARK2 3. Genetic ablation of ZBED1 impaired GSC self-renewal and extended survival in xenograft models, identifying ZBED1 as an attractive therapeutic target for glioblastoma. ZBED1 also regulates multiple biological processes in placental biology, controlling genes involved in trophoblast differentiation, cell survival, and immune tolerance 4. Additionally, ZBED1 exhibits X chromosome X|Y sensitivity; it is among 14 X-linked genes showing coordinated downregulation in Turner syndrome (45,X) and upregulation in Klinefelter syndrome (47,XXY) across multiple tissues, suggesting roles in sex chrX|Y-related disease pathogenesis 5.