TRPC4 and TRPC5 channels are important regulators of electrical excitability in both gastrointestinal myocytes and neurons. Much is known regarding the assembly and function of these channels including TRPC1 as a homotetramer or a heteromultimer and the roles that their interacting proteins play in controlling these events. Further, they are one of the best-studied targets of G protein-coupled receptors and growth factors in general and G alpha q protein coupled receptor or epidermal growth factor in particular. However, our understanding of the roles of G alpha i/o proteins on TRPC4/5 channels is still rudimentary. We discuss potential roles for G alpha i/o proteins in channel activation in addition to their known role in cellular signaling.