We delineated sequential changes affecting the exchange protein (Epac1/2), cAMP‐dependent protein kinase A (PKA) and Ca2+/Calmodulin‐dependent kinase II (CaMKII) at 4, 8 and 12 weeks following diabetes, by real‐time quantitative PCR and western blot. The gene discussed is RAPGEF3; the disease is diabetes mellitus.