Abstract
The vertebrate photoreceptor is the epitome of polarized neurons, containing two specialized compartments—the outer segment and the inner segment, connected by a narrow non-motile cilium. The outer segment of rod and cone photoreceptors is principally dedicated to capturing light and converting the energy of a photon into a change in membrane potential. The primary function of the inner segment is to provide the metabolic and synthetic demands of the photoreceptors. In order to maintain this high degree of specialization, molecules are routinely targeted to their appropriate compartment during protein synthesis. However, in addition to this relatively slow transport process, photoreceptors have a much more rapid process whereby some molecules are rapidly moved between the inner segment and outer segment through the connecting cilium in response to the light adaptational state of the eye. This translocation process has been conclusively demonstrated for two molecules involved in the phototransduction cascade—transducin and arrestin (Broekhuyse et al. 1985; Mangini and Pepperberg 1988; Whelan and McGinnis 1988; Sokolov et al. 2002; Peterson et al. 2003).
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Smith, W.C., Peterson, J.J., Orisme, W., Dinculescu, A. (2006). Arrestin Translocation in Rod Photoreceptors. In: Hollyfield, J.G., Anderson, R.E., LaVail, M.M. (eds) Retinal Degenerative Diseases. Advances in Experimental Medicine and Biology, vol 572. Springer, Boston, MA. https://doi.org/10.1007/0-387-32442-9_63
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DOI: https://doi.org/10.1007/0-387-32442-9_63
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