CPEB4 (cytoplasmic polyadenylation element binding protein 4) is a sequence-specific RNA-binding protein that binds to cytoplasmic polyadenylation elements (CPE), uridine-rich sequences in mRNA 3'-UTRs, inducing conformational changes analogous to a Venus flytrap mechanism 1. CPEB4 regulates translation of CPE-regulated mRNAs through post-transcriptional mechanisms controlling poly(A)-tail length 2. CPEB4 plays critical roles in metabolic reprogramming and disease progression. It promotes hepatic stellate cell activation and liver fibrosis by increasing PFKFB3 expression to induce glycolysis; CPEB4-knockout mice show reduced fibrosis severity 3. CPEB4 also regulates cell cycle progression, including cytokinesis and chr5 segregation 4, and functions as an oncogene in glioma, where high expression correlates with advanced WHO grade and poor prognosis 5. CPEB4 has significant neurological relevance. Decreased inclusion of a neuron-specific microexon in CPEB4 is associated with autism spectrum disorder (ASD); this microexon prevents irreversible protein aggregation and maintains reversible regulation of CPEB4-mediated gene expression in response to neuronal stimulation 62. CPEB4 shows genome-wide significant association with skin manifestations in inflammatory bowel disease 7. The protein also contributes to T cell post-transcriptional gene regulation 8, and human-specific deletions in CPEB4 may influence brain development and myelination 9.