Analysis of the expression pattern of Cajal-Retzius cell markers in the Xenopus laevis forebrain

Impacto

Downloads

Downloads per month over past year

Jiménez Álvarez, Sara and Moreno García, Nerea (2021) Analysis of the expression pattern of Cajal-Retzius cell markers in the Xenopus laevis forebrain. Brain, Behavior and Evolution, 96 . pp. 263-282. ISSN 0006-8977, Electronic: 1421-9743

[thumbnail of Jiménez, S. et al. 2021. Analysis of the Expression Pattern of Cajal-Retzius.....pdf] PDF
Restringido a Repository staff only

2MB

Official URL: https://doi.org/10.1159/000519025




Abstract

Cajal-Retzius cells are essential for cortical development in mammals, and their involvement in the evolution of this structure has been widely postulated, but very little is known about their progenitor domains in non-mammalian vertebrates. Using in situ hybridization and immunofluorescence techniques we analyzed the expression of some of the main Cajal-Retzius cell markers such as Dbx1, Ebf3, ER81, Lhx1, Lhx5, p73, Reelin, Wnt3a, Zic1, and Zic2 in the forebrain of the anuran Xenopus laevis, because amphibians are the only class of anamniote tetrapods and show a tetrapartite evaginated pallium, but no layered or nuclear organization. Our results suggested that the Cajal-Retzius cell progenitor domains were comparable to those previously described in amniotes. Thus, at dorsomedial telencephalic portions a region comparable to the cortical hem was defined in Xenopus based on the expression of Wnt3a, p73, Reelin, Zic1, and Zic2. In the septum, two different domains were observed: a periventricular dorsal septum, at the limit between the pallium and the subpallium, expressing Reelin, Zic1, and Zic2, and a related septal domain, expressing Ebf3, Zic1, and Zic2. In the lateral telencephalon, the ventral pallium next to the pallio-subpallial boundary, the lack of Dbx1 and the unique expression of Reelin during development defined this territory as the most divergent with respect to mammals. Finally, we also analyzed the expression of these markers at the prethalamic eminence region, suggested as Cajal-Retzius progenitor domain in amniotes, observing there Zic1, Zic2, ER81, and Lhx1 expression. Our data show that in anurans there are different subtypes and progenitor domains of Cajal-Retzius cells, which probably contribute to the cortical regional specification and territory-specific properties. This supports the notion that the basic organization of pallial derivatives in vertebrates follows a comparable fundamental arrangement, even in those that do not have a sophisticated stratified cortical structure like the mammalian cerebral cortex.


Item Type:Article
Uncontrolled Keywords:Pallium; Evolution; Cortical hem; Septum; Ventral pallium
Subjects:Medical sciences > Biology > Amphibians
Medical sciences > Biology > Cytology
ID Code:72807
Deposited On:10 Jun 2022 11:42
Last Modified:14 Jun 2022 08:09

Origin of downloads

Repository Staff Only: item control page