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- W1989589064 abstract "The general features of the olfactory system are remarkably consistent across vertebrates. A phylogenetic analysis of central olfactory projections indicates that at least three distinct olfactory subsystems may be broadly present in vertebrates and that a fourth, the accessory olfactory or vomeronasal system, arose in tetrapods. The origin and function of the vomeronasal system have been the subject of much controversy, but some conclusions can be drawn. The vomeronasal system did not arise as an adaptation to terrestrial life, as indicated by the presence of a vomeronasal system in modern aquatic amphibians and the increasing paleontological evidence that the last common ancestor of amphibians and amniotes was aquatic. The vomeronasal system is involved in both foraging and reproductive behaviors in reptiles and has been shown to be involved in some pheromonally mediated behaviors in mammals. However, among mammals, some pheromonal responses are not mediated by the vomeronasal system, and the possible involvement of the vomeronasal system in other type of behaviors has not yet been investigated. Thus, the relative functions of the olfactory and vomeronasal systems of tetrapods remain unclear. Other hypotheses that features of the olfactory system are specialized for aquatic chemoreception or for pheromone detection are similarly insupportable. For example, the suggestion that members of the olfactory receptor family can be separated into two groups that function for transduction of air-borne or water-borne odorants is contradicted by the presence of both groups in aquatic amphibians and by a phylogenetic analysis of the sequences for these genes. Interestingly, the putative odorant receptors from the vomeronasal epithelium share little sequence similarity with those from the olfactory epithelium, indicating that these receptors may have been independently co-opted from the larger family of seven transmembrane domain receptors for use in odor transduction. A phylogenetic analysis of the distribution of olfactory receptor cell types indicates that microvillar olfactory receptor cells are widespread among vertebrates and are not restricted to aquatic animals or to the vomeronasal epithelium of tetrapods. Previous suggestions that all microvillar receptor cells are specialized for the detection of pheromones are not tenable. Attempts to recognize features of the olfactory system that are common to all vertebrates and might be specialized for the detection of pheromones vs. more general odorants, or for the detection of water-borne vs. air-borne odorants, are not supported by current evidence." @default.
- W1989589064 created "2016-06-24" @default.
- W1989589064 creator A5020830861 @default.
- W1989589064 date "1997-01-01" @default.
- W1989589064 modified "2023-10-03" @default.
- W1989589064 title "Evolution of Vertebrate Olfactory Systems" @default.
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