ZC3H13 is a zinc finger CCCH-type protein that functions as a key component of the m6A methyltransferase writer complex, specifically the MACOM (m6A-METTL-associated complex) subcomplex 1. As an m6A writer, ZC3H13 mediates N6-methyladenosine modification of RNAs, which regulates mRNA stability, splicing, and processing 2. The protein anchors other MACOM components in the nucleus and bridges WTAP to RNA-binding components RBM15/15B within the writer complex 1. ZC3H13 exhibits tissue-specific expression patterns and plays crucial roles in cancer biology. In gastric cancer, ZC3H13 promotes epithelial-mesenchymal transition through m6A modification of SNTB1 in a YTHDF1-dependent manner 3. Conversely, in triple-negative breast cancer, ZC3H13 acts as a tumor suppressor by reducing doxorubicin resistance through ferroptosis induction via the KCNQ1OT1/TRABD axis 4. In esophageal squamous cell carcinoma, ZC3H13 promotes M2 macrophage infiltration through m6A-mediated stabilization of chemokine mRNAs like CXCL8 5. These findings highlight ZC3H13's context-dependent roles in cancer progression and its potential as both a prognostic marker and therapeutic target.