LATERAL INTERACTIONS BETWEEN VERTEBRATE PHOTORECEPTORS
نویسندگان
چکیده
منابع مشابه
Vertebrate Photoreceptors *
Twenty-five years ago I landed in New Haven with a suit-case, a few dollars, and an urgent desire to study chemistry and biology of which I had already had the hors d'oeuvre, as it were. I was properly matriculated, with advanced standing, in the Sheffield Scientific School. Although I intended to major in chemistry, my chief concern that first week was how to earn "bread and butter," not to sp...
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When light is absorbed within the outer segment of a vertebrate photoreceptor, the conformation of the photopigment rhodopsin is altered to produce an activated photoproduct called metarhodopsin II or Rh(*). Rh(*) initiates a transduction cascade similar to that for metabotropic synaptic receptors and many hormones; the Rh(*) activates a heterotrimeric G protein, which in turn stimulates an eff...
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Electron microscopic examination of the bases of adult rod and cone outer segments (rhesus monkey, ground squirrel, and grey squirrel) has led to a new model of disc morphogenesis. In this model the disc surfaces and disc rims develop by separate mechanisms and from separate regions of the membrane of the inner face of the cilium. This membrane is alternately specified into regions that will fo...
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Evidence is reviewed from a wide range of studies relevant to the evolution of vertebrate photoreceptors and phototransduction, in order to permit the synthesis of a scenario for the major steps that occurred during the evolution of cones, rods and the vertebrate retina. The ancestral opsin originated more than 700 Mya (million years ago) and duplicated to form three branches before cnidarians ...
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Meeting the challenge of sampling an ancient aquatic landscape by the early vertebrates was crucial to their survival and would establish a retinal bauplan to be used by all subsequent vertebrate descendents. Image-forming eyes were under tremendous selection pressure and the ability to identify suitable prey and detect potential predators was thought to be one of the major drivers of speciatio...
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ژورنال
عنوان ژورنال: Photochemistry and Photobiology
سال: 1987
ISSN: 0031-8655,1751-1097
DOI: 10.1111/j.1751-1097.1987.tb05379.x