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Physiological Reviews, Vol. 82, No. 3, July 2002, pp. 769-824; 10.1152/physrev.00008.2002.
Copyright ©2002 by the American Physiological Society
Institut für Biologische Informationsverarbeitung, Forschungszentrum Jülich, Jülich, Germany
Kaupp, U. Benjamin and
Reinhard Seifert.
Cyclic Nucleotide-Gated Ion Channels. Physiol. Rev. 82: 769-824, 2002.
Cyclic nucleotide-gated (CNG)
channels are nonselective cation channels first identified in retinal
photoreceptors and olfactory sensory neurons (OSNs). They are opened by
the direct binding of cyclic nucleotides, cAMP and cGMP. Although their
activity shows very little voltage dependence, CNG channels belong to
the superfamily of voltage-gated ion channels. Like their cousins the voltage-gated K+ channels, CNG channels form
heterotetrameric complexes consisting of two or three different types
of subunits. Six different genes encoding CNG channels, four A subunits
(A1 to A4) and two B subunits (B1 and B3), give rise to three different
channels in rod and cone photoreceptors and in OSNs. Important
functional features of these channels, i.e., ligand sensitivity and
selectivity, ion permeation, and gating, are determined by the subunit
composition of the respective channel complex. The function of CNG
channels has been firmly established in retinal photoreceptors and in
OSNs. Studies on their presence in other sensory and nonsensory cells have produced mixed results, and their purported roles in neuronal pathfinding or synaptic plasticity are not as well understood as their
role in sensory neurons. Similarly, the function of invertebrate homologs found in Caenorhabditis elegans, Drosophila,
and Limulus is largely unknown, except for two subunits
of C. elegans that play a role in chemosensation. CNG
channels are nonselective cation channels that do not discriminate well
between alkali ions and even pass divalent cations, in particular
Ca2+. Ca2+ entry through CNG channels is
important for both excitation and adaptation of sensory cells. CNG
channel activity is modulated by Ca2+/calmodulin and by
phosphorylation. Other factors may also be involved in channel
regulation. Mutations in CNG channel genes give rise to retinal
degeneration and color blindness. In particular, mutations in the A and
B subunits of the CNG channel expressed in human cones cause various
forms of complete and incomplete achromatopsia.
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