High affinity cGMP-specific 3',5'-cyclic phosphodiesterase 9A is an enzyme that in humans is encoded by the PDE9A gene.[5][6]
The protein encoded by this gene catalyzes the hydrolysis of cAMP and cGMP to their corresponding monophosphates. The encoded protein plays a role in signal transduction by regulating the intracellular concentration of these cyclic nucleotides. Multiple transcript variants encoding several different isoforms have been found for this gene.[6]