TRIM29 is a member of the tripartite motif-containing protein family that functions as an E3 ubiquitin ligase with diverse roles in cellular homeostasis and disease pathogenesis. Unlike other TRIM family members, TRIM29 lacks the RING finger domain typically required for E3 ligase activity 1. The protein plays context-dependent roles in various pathological processes. In viral myocarditis, TRIM29 promotes disease progression by interacting with PERK to enhance its SUMOylation and stability, thereby amplifying PERK-mediated ER stress responses and viral replication 2. TRIM29 also facilitates protein degradation through K48-linked ubiquitination, targeting proteins such as IGF2BP1 in gastric cancer, which leads to PD-L1 downregulation and enhanced antitumor immunity 3. In cardiac injury following myocardial infarction, TRIM29 acts as an E3 ligase that promotes PHB2 degradation through K48-linked polyubiquitination, thereby inhibiting mitophagy and exacerbating cardiac damage 4. Additionally, TRIM29 contributes to chemotherapy resistance in pancreatic cancer by activating the MEK/ERK pathway 5. The protein's expression is tightly regulated by non-coding RNAs, epigenetic modifications, and post-translational mechanisms, reflecting its importance as a regulatory hub in both physiological and pathological processes 6.