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Neuro-immunohistochemical and molecular expression variations during hibernation and activity phases between Rana mascareniensis and Rana ridibunda. J Therm Biol 2023. [DOI: 10.1016/j.jtherbio.2023.103490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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2
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Daume D, Offner T, Hassenklöver T, Manzini I. Patterns of tubb2b Promoter-Driven Fluorescence in the Forebrain of Larval Xenopus laevis. Front Neuroanat 2022; 16:914281. [PMID: 35873659 PMCID: PMC9304554 DOI: 10.3389/fnana.2022.914281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 06/20/2022] [Indexed: 11/25/2022] Open
Abstract
Microtubules are essential components of the cytoskeleton of all eukaryotic cells and consist of α- and β-tubulin heterodimers. Several tissue-specific isotypes of α- and β-tubulins, encoded by distinct genes, have been described in vertebrates. In the African clawed frog (Xenopus laevis), class II β-tubulin (tubb2b) is expressed exclusively in neurons, and its promoter is used to establish different transgenic frog lines. However, a thorough investigation of the expression pattern of tubb2b has not been carried out yet. In this study, we describe the expression of tubb2b-dependent Katushka fluorescence in the forebrain of premetamorphic Xenopus laevis at cellular resolution. To determine the exact location of Katushka-positive neurons in the forebrain nuclei and to verify the extent of neuronal Katushka expression, we used a transgenic frog line and performed several additional antibody stainings. We found tubb2b-dependent fluorescence throughout the Xenopus forebrain, but not in all neurons. In the olfactory bulb, tubb2b-dependent fluorescence is present in axonal projections from the olfactory epithelium, cells in the mitral cell layer, and fibers of the extrabulbar system, but not in interneurons. We also detected tubb2b-dependent fluorescence in parts of the basal ganglia, the amygdaloid complex, the pallium, the optic nerve, the preoptic area, and the hypothalamus. In the diencephalon, tubb2b-dependent fluorescence occurred mainly in the prethalamus and thalamus. As in the olfactory system, not all neurons of these forebrain regions exhibited tubb2b-dependent fluorescence. Together, our results present a detailed overview of the distribution of tubb2b-dependent fluorescence in neurons of the forebrain of larval Xenopus laevis and clearly show that tubb2b-dependent fluorescence cannot be used as a pan-neuronal marker.
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Rodríguez-Moldes I, Quintana-Urzainqui I, Santos-Durán GN, Ferreiro-Galve S, Pereira-Guldrís S, Candás M, Mazan S, Candal E. Identifying Amygdala-Like Territories in Scyliorhinus canicula (Chondrichthyan): Evidence for a Pallial Amygdala. BRAIN, BEHAVIOR AND EVOLUTION 2021; 96:283-304. [PMID: 34662880 DOI: 10.1159/000519221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 08/24/2021] [Indexed: 12/16/2022]
Abstract
To identify the putative amygdalar complex in cartilaginous fishes, our first step was to obtain evidence that supports the existence of a pallial amygdala in the catshark Scyliorhinus canicula, at present the prevailing chondrichthyan model in comparative neurobiology and developmental biology. To this end, we analyzed the organization of the lateral walls of the telencephalic hemispheres of adults, juveniles, and early prehatching embryos by immunohistochemistry against tyrosine hydroxylase (TH), somatostatin (SOM), Pax6, serotonin (5HT), substance P (SP), and Met-enkephalin (MetEnk), calbindin-28k (CB), and calretinin (CR), and by in situ hybridization against regulatory genes such as Tbr1, Lhx9, Emx1, and Dlx2. Our data were integrated with those available from the literature related to the secondary olfactory projections in this shark species. We have characterized two possible amygdalar territories. One, which may represent a ventropallial component, was identified by its chemical signature (moderate density of Pax6-ir cells, scarce TH-ir and SOM-ir cells, and absence of CR-ir and CB-ir cells) and gene expressions (Tbr1 and Lhx9 expressions in an Emx1 negative domain, as the ventral pallium of amniotes). It is perhaps comparable to the lateral amygdala of amphibians and the pallial amygdala of teleosts. The second was a territory related to the pallial-subpallial boundary with abundant Pax6-ir and CR-ir cells, and 5HT-ir, SP-ir, and MetEnk-ir fibers capping dorsally the area superficialis basalis. This olfactory-related region at the neighborhood of the pallial-subpallial boundary may represent a subpallial amygdala subdivision that possibly contains migrated cells of ventropallial origin.
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Affiliation(s)
- Isabel Rodríguez-Moldes
- Grupo Neurodevo,Departamento de Bioloxía Funcional, Centro de Investigación en Bioloxía (CIBUS), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Idoia Quintana-Urzainqui
- Grupo Neurodevo,Departamento de Bioloxía Funcional, Centro de Investigación en Bioloxía (CIBUS), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.,Developmental Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Gabriel Nicolás Santos-Durán
- Grupo Neurodevo,Departamento de Bioloxía Funcional, Centro de Investigación en Bioloxía (CIBUS), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.,Laboratory of Artificial and Natural Evolution (LANE), Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland
| | - Susana Ferreiro-Galve
- Grupo Neurodevo,Departamento de Bioloxía Funcional, Centro de Investigación en Bioloxía (CIBUS), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Santiago Pereira-Guldrís
- Grupo Neurodevo,Departamento de Bioloxía Funcional, Centro de Investigación en Bioloxía (CIBUS), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - María Candás
- REBUSC-Marine Biology Station of A Graña, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Sylvie Mazan
- CNRS, Sorbonne Universités, UPMC Univ Paris 06, UMR7232, Observatoire Océanologique, Banyuls, France
| | - Eva Candal
- Grupo Neurodevo,Departamento de Bioloxía Funcional, Centro de Investigación en Bioloxía (CIBUS), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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Marín O, Moreno N. Agustín González, an Inspirational Leader in Spanish Comparative Neuroanatomy. BRAIN, BEHAVIOR AND EVOLUTION 2021; 96:174-180. [PMID: 34644701 DOI: 10.1159/000519259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 08/14/2021] [Indexed: 06/13/2023]
Affiliation(s)
- Oscar Marín
- Centre for Developmental Neurobiology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom
- MRC Centre for Neurodevelopmental Disorders, King's College London, London, United Kingdom
| | - Nerea Moreno
- Departamento de Biología Celular, Facultad de Biología, Universidad Complutense de Madrid, Madrid, Spain
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5
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López JM, Jiménez S, Morona R, Lozano D, Moreno N. Analysis of Islet-1, Nkx2.1, Pax6, and Orthopedia in the forebrain of the sturgeon Acipenser ruthenus identifies conserved prosomeric characteristics. J Comp Neurol 2021; 530:834-855. [PMID: 34547112 DOI: 10.1002/cne.25249] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 09/07/2021] [Accepted: 09/09/2021] [Indexed: 12/19/2022]
Abstract
The distribution patterns of a set of conserved brain developmental regulatory transcription factors were analyzed in the forebrain of the basal actinopterygian fish Acipenser ruthenus, consistent with the prosomeric model. In the telencephalon, the pallium was characterized by ventricular expression of Pax6. In the subpallium, the combined expression of Nkx2.1/Islet-1 (Isl1) allowed to propose ventral and dorsal areas, as the septo-pallidal (Nkx2.1/Isl1+) and striatal derivatives (Isl1+), respectively, and a dorsal portion of the striatal derivatives, ventricularly rich in Pax6 and devoid of Isl1 expression. Dispersed Orthopedia (Otp) cells were found in the supracommissural and posterior nuclei of the ventral telencephalon, related to the medial portion of the amygdaloid complex. The preoptic area was identified by the Nkx2.1/Isl1 expression. In the alar hypothalamus, an Otp-expressing territory, lacking Nkx2.1/Isl1, was identified as the paraventricular domain. The adjacent subparaventricular domain (Spa) was subdivided in a rostral territory expressing Nkx2.1 and an Isl1+ caudal one. In the basal hypothalamus, the tuberal region was defined by the Nkx2.1/Isl1 expression and a rostral Otp-expressing domain was identified. Moreover, the Otp/Nkx2.1 combination showed an additional zone lacking Isl1, tentatively identified as the mamillary area. In the diencephalon, both Pax6 and Isl1 defined the prethalamic domain, and within the basal prosomere 3, scattered Pax6- and Isl1-expressing cells were observed in the posterior tubercle. Finally, a small group of Pax6 cells was observed in the pretectal area. These results improve the understanding of the forebrain evolution and demonstrate that its basic bauplan is present very early in the vertebrate lineage.
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Affiliation(s)
- Jesús M López
- Department of Cell Biology, Faculty of Biology, Complutense University, Madrid, Spain
| | - Sara Jiménez
- Department of Cell Biology, Faculty of Biology, Complutense University, Madrid, Spain
| | - Ruth Morona
- Department of Cell Biology, Faculty of Biology, Complutense University, Madrid, Spain
| | - Daniel Lozano
- Department of Cell Biology, Faculty of Biology, Complutense University, Madrid, Spain
| | - Nerea Moreno
- Department of Cell Biology, Faculty of Biology, Complutense University, Madrid, Spain
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6
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Alejevski F, Leemans M, Gaillard AL, Leistenschneider D, de Flori C, Bougerol M, Le Mével S, Herrel A, Fini JB, Pézeron G, Tostivint H. Conserved role of the urotensin II receptor 4 signalling pathway to control body straightness in a tetrapod. Open Biol 2021; 11:210065. [PMID: 34375549 PMCID: PMC8354755 DOI: 10.1098/rsob.210065] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Urp1 and Urp2 are two neuropeptides of the urotensin II family identified in teleost fish and mainly expressed in cerebrospinal fluid (CSF)-contacting neurons. It has been recently proposed that Urp1 and Urp2 are required for correct axis formation and maintenance. Their action is thought to be mediated by the receptor Uts2r3, which is specifically expressed in dorsal somites. In support of this view, it has been demonstrated that the loss of uts2r3 results in severe scoliosis in adult zebrafish. In the present study, we report for the first time the occurrence of urp2, but not of urp1, in two tetrapod species of the Xenopus genus. In X. laevis, we show that urp2 mRNA-containing cells are CSF-contacting neurons. Furthermore, we identified utr4, the X. laevis counterparts of zebrafish uts2r3, and we demonstrate that, as in zebrafish, it is expressed in the dorsal somatic musculature. Finally, we reveal that, in X. laevis, the disruption of utr4 results in an abnormal curvature of the antero-posterior axis of the tadpoles. Taken together, our results suggest that the role of the Utr4 signalling pathway in the control of body straightness is an ancestral feature of bony vertebrates and not just a peculiarity of ray-finned fishes.
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Affiliation(s)
- Faredin Alejevski
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - Michelle Leemans
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - Anne-Laure Gaillard
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - David Leistenschneider
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - Céline de Flori
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - Marion Bougerol
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - Sébastien Le Mével
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - Anthony Herrel
- Mécanismes adaptatifs et évolution UMR 7179 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - Jean-Baptiste Fini
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - Guillaume Pézeron
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
| | - Hervé Tostivint
- Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France
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Iyer A, Tole S. Neuronal diversity and reciprocal connectivity between the vertebrate hippocampus and septum. WILEY INTERDISCIPLINARY REVIEWS-DEVELOPMENTAL BIOLOGY 2019; 9:e370. [PMID: 31850675 DOI: 10.1002/wdev.370] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 11/13/2019] [Accepted: 11/13/2019] [Indexed: 02/02/2023]
Abstract
A hallmark of the nervous system is the precision with which myriad cell types are integrated into functional networks that control complex behaviors. The limbic system governs evolutionarily conserved processes essential for survival. The septum and the hippocampus are central to the limbic system, and control not only emotion-related behaviors but also learning and memory. Here, we provide a developmental and evolutionary perspective of the hippocampus and septum and highlight the neuronal diversity and circuitry that connects these two central components of the limbic system. This article is categorized under: Nervous System Development > Vertebrates: Regional Development Nervous System Development > Vertebrates: General Principles Comparative Development and Evolution > Regulation of Organ Diversity.
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Affiliation(s)
- Archana Iyer
- Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai, India
| | - Shubha Tole
- Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai, India
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López JM, Morona R, Moreno N, Lozano D, Jiménez S, González A. Pax6 expression highlights regional organization in the adult brain of lungfishes, the closest living relatives of land vertebrates. J Comp Neurol 2019; 528:135-159. [PMID: 31299095 DOI: 10.1002/cne.24744] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 06/27/2019] [Accepted: 07/05/2019] [Indexed: 12/15/2022]
Abstract
The Pax6 gene encodes a regulatory transcription factor that is key in brain development. The molecular structure of Pax6, the roles it plays and its patterns of expression in the brain have been highly conserved during vertebrate evolution. As neurodevelopment proceeds, the Pax6 expression changes from the mitotic germinal zone in the ventricular zone to become distributed in cell groups in the adult brain. Studies in various vertebrates, from fish to mammals, found that the Pax6 expression is maintained in adults in most regions that express it during development. Specifically, in amphibians, Pax6 is widely expressed in the adult brain and its distribution pattern serves to highlight regional organization of the brain. In the present study, we analyzed the detailed distribution of Pax6 cells in the adult central nervous system of lungfishes, the closest living relatives of all tetrapods. Immunohistochemistry performed using double labeling techniques with several neuronal markers of known distribution patterns served to evaluate the actual location of Pax6 cells. Our results show that the Pax6 expression is maintained in the adult brain of lungfishes, in distinct regions of the telencephalon (pallium and subpallium), diencephalon, mesencephalon, hindbrain, spinal cord, and retina. The pattern of Pax6 expression is largely shared with amphibians and helps to understand the primitive condition that would have characterized the common ancestors to all sarcopterygians (lobe-finned fishes and tetrapods), in which Pax6 would be needed to maintain specific entities of subpopulations of neurons.
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Affiliation(s)
- Jesús M López
- Department of Cell Biology, Faculty of Biology, University Complutense of Madrid, Madrid, Spain
| | - Ruth Morona
- Department of Cell Biology, Faculty of Biology, University Complutense of Madrid, Madrid, Spain
| | - Nerea Moreno
- Department of Cell Biology, Faculty of Biology, University Complutense of Madrid, Madrid, Spain
| | - Daniel Lozano
- Department of Cell Biology, Faculty of Biology, University Complutense of Madrid, Madrid, Spain
| | - Sara Jiménez
- Department of Cell Biology, Faculty of Biology, University Complutense of Madrid, Madrid, Spain
| | - Agustín González
- Department of Cell Biology, Faculty of Biology, University Complutense of Madrid, Madrid, Spain
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9
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Parallel Emergence of a Compartmentalized Striatum with the Phylogenetic Development of the Cerebral Cortex. Brain Sci 2019; 9:brainsci9040090. [PMID: 31010240 PMCID: PMC6523536 DOI: 10.3390/brainsci9040090] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 04/09/2019] [Accepted: 04/17/2019] [Indexed: 01/05/2023] Open
Abstract
The intricate neuronal architecture of the striatum plays a pivotal role in the functioning of the basal ganglia circuits involved in the control of various aspects of motor, cognitive, and emotional functions. Unlike the cerebral cortex, which has a laminar structure, the striatum is primarily composed of two functional subdivisions (i.e., the striosome and matrix compartments) arranged in a mosaic fashion. This review addresses whether striatal compartmentalization is present in non-mammalian vertebrates, in which simple cognitive and behavioral functions are executed by primitive sensori-motor systems. Studies show that neuronal subpopulations that share neurochemical and connective properties with striosomal and matrix neurons are present in the striata of not only anamniotes (fishes and amphibians), but also amniotes (reptiles and birds). However, these neurons do not form clearly segregated compartments in these vertebrates, suggesting that such compartmentalization is unique to mammals. In the ontogeny of the mammalian forebrain, the later-born matrix neurons disperse the early-born striosome neurons into clusters to form the compartments in tandem with the development of striatal afferents from the cortex. We propose that striatal compartmentalization in mammals emerged in parallel with the evolution of the cortex and possibly enhanced complex processing of sensory information and behavioral flexibility phylogenetically.
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Proskorovski-Ohayon R, Kadir R, Michalowski A, Flusser H, Perez Y, Hershkovitz E, Sivan S, Birk OS. PAX7mutation in a syndrome of failure to thrive, hypotonia, and global neurodevelopmental delay. Hum Mutat 2017; 38:1671-1683. [DOI: 10.1002/humu.23310] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 07/16/2017] [Accepted: 07/27/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Regina Proskorovski-Ohayon
- The Morris Kahn Laboratory of Human Genetics; National Institute for Biotechnology in the Negev and Faculty of Health Sciences; Ben Gurion University of the Negev; Beer Sheva Israel
| | - Rotem Kadir
- The Morris Kahn Laboratory of Human Genetics; National Institute for Biotechnology in the Negev and Faculty of Health Sciences; Ben Gurion University of the Negev; Beer Sheva Israel
| | - Analia Michalowski
- Zussman Child Development Center; Division of Pediatrics; Soroka University Medical Center; Faculty of Health Sciences; Ben Gurion University of the Negev; Beer Sheva Israel
| | - Hagit Flusser
- Zussman Child Development Center; Division of Pediatrics; Soroka University Medical Center; Faculty of Health Sciences; Ben Gurion University of the Negev; Beer Sheva Israel
| | - Yonatan Perez
- The Morris Kahn Laboratory of Human Genetics; National Institute for Biotechnology in the Negev and Faculty of Health Sciences; Ben Gurion University of the Negev; Beer Sheva Israel
| | - Eli Hershkovitz
- Pediatric Endocrinology and Metabolism Unit; Division of Pediatrics; Soroka University Medical Center; Faculty of Health Sciences; Ben Gurion University of the Negev; Beer Sheva Israel
| | - Sara Sivan
- The Morris Kahn Laboratory of Human Genetics; National Institute for Biotechnology in the Negev and Faculty of Health Sciences; Ben Gurion University of the Negev; Beer Sheva Israel
| | - Ohad S. Birk
- The Morris Kahn Laboratory of Human Genetics; National Institute for Biotechnology in the Negev and Faculty of Health Sciences; Ben Gurion University of the Negev; Beer Sheva Israel
- Genetics Institute; Soroka University Medical Center; affiliated to Ben Gurion University of the Negev; Beer Sheva Israel
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11
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Moreno N, González A. Pattern of Neurogenesis and Identification of Neuronal Progenitor Subtypes during Pallial Development in Xenopus laevis. Front Neuroanat 2017; 11:24. [PMID: 28396626 PMCID: PMC5366753 DOI: 10.3389/fnana.2017.00024] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 03/08/2017] [Indexed: 11/13/2022] Open
Abstract
The complexity of the pallium during evolution has increased dramatically in many different respects. The highest level of complexity is found in mammals, where most of the pallium (cortex) shows a layered organization and neurons are generated during development following an inside-out order, a sequence not observed in other amniotes (birds and reptiles). Species-differences may be related to major neurogenetic events, from the neural progenitors that divide and produce all pallial cells. In mammals, two main types of precursors have been described, primary precursor cells in the ventricular zone (vz; also called radial glial cells or apical progenitors) and secondary precursor cells (called basal or intermediate progenitors) separated from the ventricle surface. Previous studies suggested that pallial neurogenetic cells, and especially the intermediate progenitors, evolved independently in mammalian and sauropsid lineages. In the present study, we examined pallial neurogenesis in the amphibian Xenopus laevis, a representative species of the only group of tetrapods that are anamniotes. The pattern of pallial proliferation during embryonic and larval development was studied, together with a multiple immunohistochemical analysis of putative progenitor cells. We found that there are two phases of progenitor divisions in the developing pallium that, following the radial unit concept from the ventricle to the mantle, finally result in an outside-in order of mature neurons, what seems to be the primitive condition of vertebrates. Gene expressions of key transcription factors that characterize radial glial cells in the vz were demonstrated in Xenopus. In addition, although mitotic cells were corroborated outside the vz, the expression pattern of markers for intermediate progenitors differed from mammals.
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Affiliation(s)
- Nerea Moreno
- Department of Cell Biology, Faculty of Biology, Complutense University of Madrid Madrid, Spain
| | - Agustín González
- Department of Cell Biology, Faculty of Biology, Complutense University of Madrid Madrid, Spain
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12
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Morona R, Ferran JL, Puelles L, González A. Gene expression analysis of developing cell groups in the pretectal region ofXenopus laevis. J Comp Neurol 2016; 525:715-752. [DOI: 10.1002/cne.24099] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 07/18/2016] [Accepted: 07/28/2016] [Indexed: 01/09/2023]
Affiliation(s)
- Ruth Morona
- Department of Cell Biology, Faculty of Biology; University Complutense of Madrid; 28040 Madrid Spain
| | - José Luis Ferran
- Department of Human Anatomy and Psychobiology; University of Murcia and Murcian Institute of Biomedical Research (IMIB); E30071 Murcia Spain
| | - Luis Puelles
- Department of Human Anatomy and Psychobiology; University of Murcia and Murcian Institute of Biomedical Research (IMIB); E30071 Murcia Spain
| | - Agustín González
- Department of Cell Biology, Faculty of Biology; University Complutense of Madrid; 28040 Madrid Spain
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13
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Bandín S, Morona R, González A. Prepatterning and patterning of the thalamus along embryonic development of Xenopus laevis. Front Neuroanat 2015; 9:107. [PMID: 26321920 PMCID: PMC4530589 DOI: 10.3389/fnana.2015.00107] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 07/24/2015] [Indexed: 01/18/2023] Open
Abstract
Previous developmental studies of the thalamus (alar part of the diencephalic prosomere p2) have defined the molecular basis for the acquisition of the thalamic competence (preparttening), the subsequent formation of the secondary organizer in the zona limitans intrathalamica, and the early specification of two anteroposterior domains (rostral and caudal progenitor domains) in response to inducing activities and that are shared in birds and mammals. In the present study we have analyzed the embryonic development of the thalamus in the anuran Xenopus laevis to determine conserved or specific features in the amphibian diencephalon. From early embryonic stages to the beginning of the larval period, the expression patterns of 22 markers were analyzed by means of combined In situ hybridization (ISH) and immunohistochemical techniques. The early genoarchitecture observed in the diencephalon allowed us to discern the boundaries of the thalamus with the prethalamus, pretectum, and epithalamus. Common molecular features were observed in the thalamic prepatterning among vertebrates in which Wnt3a, Fez, Pax6 and Xiro1 expression were of particular importance in Xenopus. The formation of the zona limitans intrathalamica was observed, as in other vertebrates, by the progressive expression of Shh. The largely conserved expressions of Nkx2.2 in the rostral thalamic domain vs. Gbx2 and Ngn2 (among others) in the caudal domain strongly suggest the role of Shh as morphogen in the amphibian thalamus. All these data showed that the molecular characteristics observed during preparttening and patterning in the thalamus of the anuran Xenopus (anamniote) share many features with those described during thalamic development in amniotes (common patterns in tetrapods) but also with zebrafish, strengthening the idea of a basic organization of this diencephalic region across vertebrates.
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Affiliation(s)
- Sandra Bandín
- Faculty of Biology, Department of Cell Biology, University Complutense Madrid, Spain
| | - Ruth Morona
- Faculty of Biology, Department of Cell Biology, University Complutense Madrid, Spain
| | - Agustín González
- Faculty of Biology, Department of Cell Biology, University Complutense Madrid, Spain
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14
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Moreno N, Joven A, Morona R, Bandín S, López JM, González A. Conserved localization of Pax6 and Pax7 transcripts in the brain of representatives of sarcopterygian vertebrates during development supports homologous brain regionalization. Front Neuroanat 2014; 8:75. [PMID: 25147506 PMCID: PMC4123791 DOI: 10.3389/fnana.2014.00075] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 07/21/2014] [Indexed: 11/20/2022] Open
Abstract
Many of the genes involved in brain patterning during development are highly conserved in vertebrates and similarities in their expression patterns help to recognize homologous cell types or brain regions. Among these genes, Pax6 and Pax7 are expressed in regionally restricted patterns in the brain and are essential for its development. In the present immunohistochemical study we analyzed the distribution of Pax6 and Pax7 cells in the brain of six representative species of tetrapods and lungfishes, the closest living relatives of tetrapods, at several developmental stages. The distribution patterns of these transcription factors were largely comparable across species. In all species only Pax6 was expressed in the telencephalon, including the olfactory bulbs, septum, striatum, and amygdaloid complex. In the diencephalon, Pax6 and Pax7 were distinct in the alar and basal parts, mainly in prosomeres 1 and 3. Pax7 specifically labeled cells in the optic tectum (superior colliculus) and Pax6, but not Pax7, cells were found in the tegmentum. Pax6 was found in most granule cells of the cerebellum and Pax7 labeling was detected in cells of the ventricular zone of the rostral alar plate and in migrated cells in the basal plate, including the griseum centrale and the interpeduncular nucleus. Caudally, Pax6 cells formed a column, whereas the ventricular zone of the alar plate expressed Pax7. Since the observed Pax6 and Pax7 expression patterns are largely conserved they can be used to identify subdivisions in the brain across vertebrates that are not clearly discernible with classical techniques.
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Affiliation(s)
- Nerea Moreno
- Department of Cell Biology, Faculty of Biology, Complutense University of Madrid Madrid, Spain
| | - Alberto Joven
- Department of Cell Biology, Faculty of Biology, Complutense University of Madrid Madrid, Spain
| | - Ruth Morona
- Department of Cell Biology, Faculty of Biology, Complutense University of Madrid Madrid, Spain
| | - Sandra Bandín
- Department of Cell Biology, Faculty of Biology, Complutense University of Madrid Madrid, Spain
| | - Jesús M López
- Department of Cell Biology, Faculty of Biology, Complutense University of Madrid Madrid, Spain
| | - Agustín González
- Department of Cell Biology, Faculty of Biology, Complutense University of Madrid Madrid, Spain
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