Rho GTPases are a subgroup of the Ras superfamily of GTP-binding proteins that regulate a wide range of cellular functions. They are conserved across species and function as molecular switches, cycling between GDP- and GTP-bound states. Initially thought to be involved in cytoskeletal organization, Rho GTPases are now known to play roles in membrane trafficking, transcriptional regulation, cell growth, and development. Their activity is regulated by GEFs, which promote GTP exchange, and GAPs, which enhance GTP hydrolysis. GDIs also regulate Rho GTPases by inhibiting GTP exchange and hydrolysis. GEFs, such as Dbl, Tiam, Fgd1, and Vav, contain DH and PH domains and are essential for Rho activation. Some GEFs, like Lbc, Lfc, and Lsc, are specific to Rho, while others, like Fgd1, are specific to Cdc42. GAPs, such as p50Rho-GAP and p190GAP, regulate Rho activity by promoting GTP hydrolysis. Rho GDI is involved in the translocation of Rho GTPases between membranes and the cytoplasm. Rho GTPases are involved in various signaling pathways, including those mediated by G proteins and phosphoinositide kinases. They regulate actin cytoskeleton organization, leading to the formation of stress fibers, focal adhesions, and lamellipodia. Rho also influences membrane trafficking, phagocytosis, and cell motility. Rho GTPases interact with various proteins, including Rho kinase, MBS, and p140mDia, to regulate actin polymerization and cytoskeletal rearrangements. Cdc42 and Rac also play roles in cytoskeletal organization, with PAKs and other proteins involved in their signaling. Rho GTPases are essential for cell growth, development, and responses to extracellular signals. Understanding their molecular mechanisms is crucial for elucidating their roles in various cellular processes.Rho GTPases are a subgroup of the Ras superfamily of GTP-binding proteins that regulate a wide range of cellular functions. They are conserved across species and function as molecular switches, cycling between GDP- and GTP-bound states. Initially thought to be involved in cytoskeletal organization, Rho GTPases are now known to play roles in membrane trafficking, transcriptional regulation, cell growth, and development. Their activity is regulated by GEFs, which promote GTP exchange, and GAPs, which enhance GTP hydrolysis. GDIs also regulate Rho GTPases by inhibiting GTP exchange and hydrolysis. GEFs, such as Dbl, Tiam, Fgd1, and Vav, contain DH and PH domains and are essential for Rho activation. Some GEFs, like Lbc, Lfc, and Lsc, are specific to Rho, while others, like Fgd1, are specific to Cdc42. GAPs, such as p50Rho-GAP and p190GAP, regulate Rho activity by promoting GTP hydrolysis. Rho GDI is involved in the translocation of Rho GTPases between membranes and the cytoplasm. Rho GTPases are involved in various signaling pathways, including those mediated by G proteins and phosphoinositide kinases. They regulate actin cytoskeleton organization, leading to the formation of stress fibers, focal adhesions, and lamellipodia. Rho also influences membrane trafficking, phagocytosis, and cell motility. Rho GTPases interact with various proteins, including Rho kinase, MBS, and p140mDia, to regulate actin polymerization and cytoskeletal rearrangements. Cdc42 and Rac also play roles in cytoskeletal organization, with PAKs and other proteins involved in their signaling. Rho GTPases are essential for cell growth, development, and responses to extracellular signals. Understanding their molecular mechanisms is crucial for elucidating their roles in various cellular processes.