ZC3H4 is an RNA-binding protein that functions as a critical suppressor of long non-coding RNA (lncRNA) transcription 12. As a component of the Restrictor complex with WDR82 and ARS2, ZC3H4 recognizes inefficiently spliced lncRNA first exons and promotes their transcription termination and subsequent degradation by the exosome 13. Beyond ncRNA regulation, ZC3H4 safeguards genome stability by preventing transcription-replication conflicts and R-loop formation at noncoding RNA loci, thereby mitigating replication stress and DNA damage 4. Clinically, ZC3H4 dysfunction associates with multiple pathologies. In pulmonary fibrosis, ZC3H4 promotes fibroblast activation via endoplasmic reticulum stress through a positive feedback loop 5. ZC3H4 loss increases mitochondrial dysfunction and drives prostate stromal cell senescence and anoikis resistance 6. Conversely, ZC3H4 is upregulated in silicosis, where the circZC3H4/ZC3H4 pathway mediates macrophage activation and promotes fibroblast proliferation 7. Notably, HPV16 hijacks ZC3H4 through BRD4-dependent recruitment to activate the viral late promoter during cell differentiation, supporting capsid protein expression and viral replication 8. These findings position ZC3H4 as a pivotal regulator at the intersection of transcriptional control, genome stability, and disease pathogenesis.