Abstract
The phototransduction cascade is the series of biochemical reactions through which a photon of light results in decreased neurotransmitter release in the photoreceptor. Analogous but biochemically distinct pathways are responsible for both rod and cone phototransduction. 1 A photon of light results in the photoisomerization of rhodopsin from 11-cis retinal to all trans retinal in the rod. This allows transducin to exchange GTP for GDP. This activated transducin complex can then release the inhibitory γ subunit from the cGMP phosphodiesterase (PDE) resulting in a decreased concentration of free cGMP. A cGMP-gated cation channel is then closed decreasing sodium conductance and hyperpolarizing the photoreceptor.
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Hurwitz, R.L. et al. (1993). Nonsense Mutations in the ß Subunit Gene of the Rod cGMP Phosphodiesterase That are Associated with Inherited Retinal Degenerative Disease. In: Hollyfield, J.G., Anderson, R.E., LaVail, M.M. (eds) Retinal Degeneration. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2974-3_25
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DOI: https://doi.org/10.1007/978-1-4615-2974-3_25
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