RAP2A (RAP2A, member of RAS oncogene family) is a small GTPase that functions as a molecular switch cycling between GDP-bound inactive and GTP-bound active states 1. The protein serves as a key mechanotransducer in the Hippo pathway, where it is activated by low extracellular matrix stiffness and subsequently activates MAP4K kinases to regulate YAP/TAZ transcriptional activity 1. RAP2A integrates cytoskeletal signals and coordinates cellular responses to mechanical cues, including regulation of cell migration, adhesion, and proliferation 2. In metabolic contexts, RAP2A participates in β3-adrenergic receptor desensitization through the EPAC/RAP2A/PI-PLC pathway, contributing to catecholamine resistance in obesity 3. The gene is transcriptionally regulated by p53 following DNA damage and shows aberrant expression in various cancers 4. In cancer contexts, RAP2A enhances cell migration and invasion through Akt pathway activation and MMP regulation 4. However, its expression requires tight regulation, as both overexpression and knockdown impair macrophage NF-κB signaling and inflammatory responses 5. RAP2A also affects chemotherapy sensitivity, with its downregulation enhancing 5-FU sensitivity in gastric cancer cells 6.