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- W2161802912 abstract "In craniates, opsin-based photopigments expressed in the eye encode molecular ‘light sensors’ that constitute the initial protein in photoreception and the activation of the phototransduction cascade. Since the cloning and sequencing of the first vertebrate opsin gene (bovine rod opsin) nearly 30 years ago (Ovchinnikov Yu 1982, FEBS Letters, 148, 179–191; Hargrave et al. 1983, Biophysics of Structure & Mechanism, 9, 235–244; Nathans & Hogness 1983, Cell, 34, 807–814), it is now well established that variation in the subtypes and spectral properties of the visual pigments that mediate colour and dim-light vision is a prevalent mechanism for the molecular adaptation to diverse light environments. In this review, we discuss the origins and spectral tuning of photopigments that first arose in the agnathans to sample light within the ancient aquatic landscape of the Early Cambrian, detailing the molecular changes that subsequently occurred in each of the opsin classes independently within the main branches of extant jawed gnathostomes. Specifically, we discuss the adaptive changes that have occurred in the photoreceptors of craniates as they met the ecological challenges to survive in quite differing photic niches, including brightly lit aquatic surroundings; the deep sea; the transition to and from land; diurnal, crepuscular and nocturnal environments; and light-restricted fossorial settings. The review ends with a discussion of the limitations inherent to the ‘nocturnal-bottleneck’ hypothesis relevant to the evolution of the mammalian visual system and a proposition that transition through a ‘mesopic-bottleneck’ may be a more appropriate model." @default.
- W2161802912 created "2016-06-24" @default.
- W2161802912 creator A5050275183 @default.
- W2161802912 creator A5053471289 @default.
- W2161802912 creator A5074274548 @default.
- W2161802912 date "2012-05-31" @default.
- W2161802912 modified "2023-10-14" @default.
- W2161802912 title "Molecular ecology and adaptation of visual photopigments in craniates" @default.
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