Phosphodiesterase 6A, cGMP-specific, rod, alpha subunit (PDE6A)

Phosphodiesterase 6A, cGMP-specific, rod, alpha subunit (PDE6A) is an enzyme highly expressed in the outer segments of retinal rod photoreceptors. It forms the catalytic alpha subunit of the PDE6 holoenzyme, which functions as the central effector in the phototransduction cascade. Upon light activation, PDE6A associates with other subunits (beta and gamma) to hydrolyze cyclic GMP (cGMP), causing a rapid decrease in intracellular cGMP concentrations. This decline results in the closure of cGMP-gated ion channels, hyperpolarization of the photoreceptor cell, and transmission of the visual signal. Mutations in the PDE6A gene disrupt these processes and are a known cause of autosomal recessive retinitis pigmentosa and related inherited retinal diseases. While the catalytic mechanism and regulatory interactions of PDE6A are well characterized, there are currently no approved drugs that selectively target this subunit; therapies are primarily supportive, with gene therapy approaches in development[2][4][5].

Other names

PDE6AcGMP-specific 3',5'-cyclic phosphodiesterase subunit alphaRod cGMP phosphodiesterase alpha subunit

Inhibition of cGMP hydrolysis (for phosphodiesterase inhibitors acting on this class, although these are not PDE6A-specific); Restoration of gene function (for gene therapies targeting PDE6A mutations in retinal diseases[5][2])