Understanding the basic circuitry of the cerebral hemispheres: the case of lizards and its implications in the evolution of the telencephalon

Lanuza, Enrique; Novejarque, Amparo; Moncho-Bogani, José; Hernández, Adoración Guamán; Martı́nez-Garcı́a, Fernando

doi:10.1016/s0361-9230(01)00710-9

Cited by 16 publications

(7 citation statements)

References 13 publications

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“…In other vertebrate species, proliferation is almost constitutive along lateral ventricles, and discrete areas in the pallium that show hot spots of proliferation during adulthood have been interpreted as hippocampal domains (for a review see Kaslin et al 2008). This is true for the dorso-medial cortex in reptiles (Lanuza et al 2002;Ramirez-Castillejo et al 2002;Rodríguez et al 2002) and the lateral portion of dorsal telencephalon in teleosts Broglio et al 2005;Zupanc et al 2005;Grandel et al 2006;Adolf et al 2006). We, therefore, tentatively identified the medial pallial domain that contains subpallial-derived Nkx2.1-expressing cells as the homolog in sharks of the primordial hippocampus.…”

Section: Discussionmentioning

confidence: 99%

Tangential migratory pathways of subpallial origin in the embryonic telencephalon of sharks: evolutionary implications

et al. 2014

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Tangential neuronal migration occurs along different axes from the axis demarcated by radial glia and it is thought to have evolved as a mechanism to increase the diversity of cell types in brain areas, which in turn resulted in increased complexity of functional networks. In the telencephalon of amniotes, different embryonic tangential pathways have been characterized. However, little is known about the exact routes of migrations in basal vertebrates. Cartilaginous fishes occupy a key phylogenetic position to assess the ancestral condition of vertebrate brain organization. In order to identify putative subpallial-derived tangential migratory pathways in the telencephalon of sharks, we performed a detailed analysis of the distribution pattern of GAD and Dlx2, two reliable markers of tangentially migrating interneurons of subpallial origin in the developing forebrain. We propose the existence of five tangential routes directed toward different telencephalic regions. We conclude that four of the five routes might have emerged in the common ancestor of jawed vertebrates. We have paid special attention to the characterization of the proposed migratory pathway directed towards the olfactory bulbs. Our results suggest that it may be equivalent to the "rostral migratory stream" of mammals and led us to propose a hypothesis about its evolution. The analysis of the final destinations of two other streams allowed us to identify the putative dorsal and medial pallium of sharks, the regions from which the neocortex and hippocampus might have, respectively, evolved. Derived features were also reported and served to explain some distinctive traits in the morphology of the telencephalon of cartilaginous fishes.

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Section: Discussionmentioning

confidence: 99%

Tangential migratory pathways of subpallial origin in the embryonic telencephalon of sharks: evolutionary implications

et al. 2014

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“…Our description is based on the general scheme of the cerebral hemispheres proposed by Swanson and Risold (1999), further refined by Lanuza et al (2002). According to this scheme, the subcortical telencephalon is composed of striatal and pallidal territories.…”

Section: Discussionmentioning

confidence: 99%

Amygdalostriatal projections in reptiles: A tract‐tracing study in the lizardPodarcis hispanica

Novejarque

Lanuza

Martı́nez-Garcı́a

2004

J of Comparative Neurology

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Registro de acceso restringido Este recurso no está disponible en acceso abierto por política de la editorial. No obstante, se puede acceder al texto completo desde la Universitat Jaume I o si el usuario cuenta con suscripción. Registre d'accés restringit Aquest recurs no està disponible en accés obert per política de l'editorial. No obstant això, es pot accedir al text complet des de la Universitat Jaume I o si l'usuari compta amb subscripció. Restricted access item This item isn't open access because of publisher's policy. The full--text version is only available from Jaume I University or if the user has a running suscription to the publisher's contents.

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“…Constitutive neurogenesis and turnover of cells is seen in the hippocampus of mammals and birds (Doetsch & Scharff 2001;Kempermann et al 2004a). Similarly, active neurogenesis is seen in the dorsomedial cortex of reptiles, a structure that is thought to be homologous to the hippocampus of birds and mammals based on developmental, neuroanatomical and behavioural data (Lanuza et al 2002;Rodriguez et al 2002). Furthermore, recently generated neuroblasts in the medial cortex express PSA-NCAM as they migrate (RamirezCastillejo et al 2002).…”

Section: (D) Reptilesmentioning

confidence: 99%

Proliferation, neurogenesis and regeneration in the non-mammalian vertebrate brain

Kaslin

Ganz

Brand

2007

Phil. Trans. R. Soc. B

319

302

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Post-embryonic neurogenesis is a fundamental feature of the vertebrate brain. However, the level of adult neurogenesis decreases significantly with phylogeny. In the first part of this review, a comparative analysis of adult neurogenesis and its putative roles in vertebrates are discussed. Adult neurogenesis in mammals is restricted to two telencephalic constitutively active zones. On the contrary, non-mammalian vertebrates display a considerable amount of adult neurogenesis in many brain regions. The phylogenetic differences in adult neurogenesis are poorly understood. However, a common feature of vertebrates (fish, amphibians and reptiles) that display a widespread adult neurogenesis is the substantial post-embryonic brain growth in contrast to birds and mammals. It is probable that the adult neurogenesis in fish, frogs and reptiles is related to the coordinated growth of sensory systems and corresponding sensory brain regions. Likewise, neurons are substantially added to the olfactory bulb in smell-oriented mammals in contrast to more visually oriented primates and songbirds, where much fewer neurons are added to the olfactory bulb. The second part of this review focuses on the differences in brain plasticity and regeneration in vertebrates. Interestingly, several recent studies show that neurogenesis is suppressed in the adult mammalian brain. In mammals, neurogenesis can be induced in the constitutively neurogenic brain regions as well as ectopically in response to injury, disease or experimental manipulations. Furthermore, multipotent progenitor cells can be isolated and differentiated in vitro from several otherwise silent regions of the mammalian brain. This indicates that the potential to recruit or generate neurons in non-neurogenic brain areas is not completely lost in mammals. The level of adult neurogenesis in vertebrates correlates with the capacity to regenerate injury, for example fish and amphibians exhibit the most widespread adult neurogenesis and also the greatest capacity to regenerate central nervous system injuries. Studying these phenomena in non-mammalian vertebrates may greatly increase our understanding of the mechanisms underlying regeneration and adult neurogenesis. Understanding mechanisms that regulate endogenous proliferation and neurogenic permissiveness in the adult brain is of great significance in therapeutical approaches for brain injury and disease.

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Understanding the basic circuitry of the cerebral hemispheres: the case of lizards and its implications in the evolution of the telencephalon

Cited by 16 publications

References 13 publications

Tangential migratory pathways of subpallial origin in the embryonic telencephalon of sharks: evolutionary implications

Tangential migratory pathways of subpallial origin in the embryonic telencephalon of sharks: evolutionary implications

Amygdalostriatal projections in reptiles: A tract‐tracing study in the lizardPodarcis hispanica

Proliferation, neurogenesis and regeneration in the non-mammalian vertebrate brain

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