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01-08-2017 | Original Article

Non-neurogenic SVZ-like niche in dolphins, mammals devoid of olfaction

Authors: Roberta Parolisi, Bruno Cozzi, Luca Bonfanti

Published in: Brain Structure and Function | Issue 6/2017

Abstract

Adult neurogenesis has been implicated in brain plasticity and brain repair. In mammals, it is mostly restricted to specific brain regions and specific physiological functions. The function and evolutionary history of mammalian adult neurogenesis has been elusive so far. The largest neurogenic site in mammals (subventricular zone, SVZ) generates neurons destined to populate the olfactory bulb. The SVZ neurogenic activity appears to be related to the dependence of the species on olfaction since it occurs at high rates throughout life in animals strongly dependent on this function for their survival. Indeed, it dramatically decreases in humans, who do not depend so much on it. This study investigates whether the SVZ neurogenic site exists in mammals devoid of olfaction and olfactory brain structures, such as dolphins. Our results demonstate that a small SVZ-like region persists in these aquatic mammals. However, this region seems to have lost its neurogenic capabilities since neonatal stages. In addition, instead of the typical newly generated neuroblasts, some mature neurons were observed in the dolphin SVZ. Since cetaceans evolved from terrestrial ancestors, non-neurogenic SVZ may indicate extinction of adult neurogenesis in the absence of olfactory function, with the retention of an SVZ-like anatomical region either vestigial or of still unknown role.

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Title: Non-neurogenic SVZ-like niche in dolphins, mammals devoid of olfaction
Authors: Roberta Parolisi
Bruno Cozzi
Luca Bonfanti
Publication date: 01-08-2017
Publisher: Springer Berlin Heidelberg
Published in: Brain Structure and Function / Issue 6/2017
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-016-1361-3

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Non-neurogenic SVZ-like niche in dolphins, mammals devoid of olfaction

Abstract

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