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Functional motifs composed of morphologically homologous neurons repeated in the hindbrain segments. J Neurosci 2014; 34:3291-302. [PMID: 24573288 DOI: 10.1523/jneurosci.4610-13.2014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Segmental organization along the neuraxis is a prominent feature of the CNS in vertebrates. In a wide range of fishes, hindbrain segments contain orderly arranged reticulospinal neurons (RSNs). Individual RSNs in goldfish and zebrafish hindbrain are morphologically identified. RSNs sharing similar morphological features are called segmental homologs and repeated in adjacent segments. However, little is known about functional relationships among segmental homologs. Here we investigated the electrophysiological connectivity between the Mauthner cell (M-cell), a pair of giant RSNs in segment 4 (r4) that are known to trigger fast escape behavior, and different series of homologous RSNs in r4-r6. Paired intracellular recordings in adult goldfish revealed unidirectional connections from the M-cell to RSNs. The connectivity was similar in morphological homologs. A single M-cell spike produced IPSPs in dorsally located RSNs (MiD cells) on the ipsilateral side and excitatory postsynaptic depolarization on the contralateral side, except for MiD2cm cells. The inhibitory or excitatory potentials effectively suppressed or enhanced target RSNs spiking, respectively. In contrast to the lateralized effects on MiD cells, single M-cell spiking elicited equally strong depolarizations on bilateral RSNs located ventrally (MiV cells), and the depolarization was high enough for MiV cells to burst. Therefore, the morphological homology of repeated RSNs in r4-r6 and their functional M-cell connectivity were closely correlated, suggesting that each functional connection works as a functional motif during the M-cell-initiated escape.
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Abu-Amero KK, Kondkar AA, Alorainy IA, Khan AO, Al-Enazy LA, Oystreck DT, Bosley TM. Xq26.3 microdeletion in a male with Wildervanck Syndrome. Ophthalmic Genet 2013; 35:18-24. [PMID: 23373430 DOI: 10.3109/13816810.2013.766218] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Wildervanck Syndrome (WS; cervico-oculo-acoustic syndrome) consists of Duane retraction syndrome (DRS), the Klippel-Feil anomaly, and congenital deafness. It is much more common in females than males and could be due to an X-linked mutation that is lethal to hemizygous males. We present the genetic evaluation of a male with WS and his family. MATERIALS AND METHODS Clinical evaluation and neuroimaging, sequencing of candidate genes, and array comparative genomic hybridization. RESULTS The patient had bilateral type 1 DRS, fusion of almost the entire cervical spine, and bilateral severe sensorineural hearing loss due to bilateral cochlear dysplasia; he also had congenital heart disease requiring surgery. His parents were unrelated, and he had eight unaffected siblings. The patient had no mutation found by Sanger sequencing of HOXA1, KIF21A, SALL4, and CHN1. He had a 3kB deletion in the X-chromosome at Xq26.3 that was not found in his mother, one unaffected sibling, or 56 healthy controls of matching ethnicity. This deletion encompassed only one gene, Fibroblast Growth Factor Homologous Factor 13 (FGF13), which encodes a 216-amino acid protein that acts intracellularly in neurons throughout brain development. CONCLUSIONS Analysis of this patient's phenotype and genotype open the possibility that X-chromosome deletions may be a cause of WS with larger deletions being lethal to males and that FGF13 mutations may be a cause of WS.
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Affiliation(s)
- Khaled K Abu-Amero
- Department of Ophthalmology, College of Medicine, King Saud University , Riyadh , Saudi Arabia
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3
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Abstract
The vertebrate A-P axis is a time axis. The head is made first and more and more posterior levels are made at later and later stages. This is different to the situation in most other animals, for example, in Drosophila. Central to this timing is Hox temporal collinearity (see below). This occurs rarely in the animal kingdom but is characteristic of vertebrates and is used to generate the primary axial Hox pattern using time space translation and to integrate successive derived patterns (see below). This is thus a different situation than in Drosophila, where the primary pattern guiding Hox spatial collinearity is generated externally, by the gap and segmentation genes.
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Affiliation(s)
- Aj Durston
- Institute of Biology, University of Leiden, Sylvius Laboratory, Wassenaarseweg 72, 2333 BE, Leiden, Netherlands
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4
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Development of the serotonergic cells in murine raphe nuclei and their relations with rhombomeric domains. Brain Struct Funct 2012; 218:1229-77. [PMID: 23052546 PMCID: PMC3748323 DOI: 10.1007/s00429-012-0456-8] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 09/08/2012] [Indexed: 12/18/2022]
Abstract
The raphe nuclei represent the origin of central serotonergic projections. The literature distinguishes seven nuclei grouped into rostral and caudal clusters relative to the pons. The boundaries of these nuclei have not been defined precisely enough, particularly with regard to developmental units, notably hindbrain rhombomeres. We hold that a developmental point of view considering rhombomeres may explain observed differences in connectivity and function. There are twelve rhombomeres characterized by particular genetic profiles, and each develops between one and four distinct serotonergic populations. We have studied the distribution of the conventional seven raphe nuclei among these twelve units. To this aim, we correlated 5-HT-immunoreacted neurons with rhombomeric boundary landmarks in sagittal mouse brain sections at different developmental stages. Furthermore, we performed a partial genoarchitectonic analysis of the developing raphe nuclei, mapping all known serotonergic differentiation markers, and compared these results, jointly with others found in the literature, with our map of serotonin-containing populations, in order to examine regional variations in correspondence. Examples of regionally selective gene patterns were identified. As a result, we produced a rhombomeric classification of some 45 serotonergic populations, and suggested a corresponding modified terminology. Only a minor rostral part of the dorsal raphe nucleus lies in the midbrain. Some serotonergic neurons were found in rhombomere 4, contrary to the conventional assumption that it lacks such neurons. We expect that our reclassification of raphe nuclei may be useful for causal analysis of their differential molecular specification, as well as for studies of differential connectivity and function.
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Burzynski GM, Reed X, Taher L, Stine ZE, Matsui T, Ovcharenko I, McCallion AS. Systematic elucidation and in vivo validation of sequences enriched in hindbrain transcriptional control. Genome Res 2012; 22:2278-89. [PMID: 22759862 PMCID: PMC3483557 DOI: 10.1101/gr.139717.112] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Illuminating the primary sequence encryption of enhancers is central to understanding the regulatory architecture of genomes. We have developed a machine learning approach to decipher motif patterns of hindbrain enhancers and identify 40,000 sequences in the human genome that we predict display regulatory control that includes the hindbrain. Consistent with their roles in hindbrain patterning, MEIS1, NKX6-1, as well as HOX and POU family binding motifs contributed strongly to this enhancer model. Predicted hindbrain enhancers are overrepresented at genes expressed in hindbrain and associated with nervous system development, and primarily reside in the areas of open chromatin. In addition, 77 (0.2%) of these predictions are identified as hindbrain enhancers on the VISTA Enhancer Browser, and 26,000 (60%) overlap enhancer marks (H3K4me1 or H3K27ac). To validate these putative hindbrain enhancers, we selected 55 elements distributed throughout our predictions and six low scoring controls for evaluation in a zebrafish transgenic assay. When assayed in mosaic transgenic embryos, 51/55 elements directed expression in the central nervous system. Furthermore, 30/34 (88%) predicted enhancers analyzed in stable zebrafish transgenic lines directed expression in the larval zebrafish hindbrain. Subsequent analysis of sequence fragments selected based upon motif clustering further confirmed the critical role of the motifs contributing to the classifier. Our results demonstrate the existence of a primary sequence code characteristic to hindbrain enhancers. This code can be accurately extracted using machine-learning approaches and applied successfully for de novo identification of hindbrain enhancers. This study represents a critical step toward the dissection of regulatory control in specific neuronal subtypes.
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Affiliation(s)
- Grzegorz M Burzynski
- McKusick-Nathans Institute of Genetic Medicine, Department of Molecular and Comparative Pathobiology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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Correa GG, Amaral LF, Vedolin LM. Neuroimaging of Dandy-Walker malformation: new concepts. Top Magn Reson Imaging 2011; 22:303-312. [PMID: 24132069 DOI: 10.1097/rmr.0b013e3182a2ca77] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Dandy-Walker malformation (DWM) is the most common human cerebellar malformation, characterized by hypoplasia of the cerebellar vermis, cystic dilation of the fourth ventricle, and an enlarged posterior fossa with upward displacement of the lateral sinuses, tentorium, and torcular. Although its pathogenesis is not completely understood, there are several genetic loci related to DWM as well as syndromic malformations and congenital infections. Dandy-Walker malformation is associated with other central nervous system abnormalities, including dysgenesis of corpus callosum, ectopic brain tissue, holoprosencephaly, and neural tube defects. Hydrocephalus plays an important role in the development of symptoms and neurological outcome in patients with DWM, and the aim of surgical treatment is usually the control of hydrocephalus and the posterior fossa cyst. Imaging modalities, especially magnetic resonance imaging, are crucial for the diagnosis of DWM and distinguishing this disorder from other cystic posterior fossa lesions. Persistent Blake's cyst is seen as a retrocerebellar fluid collection with cerebrospinal fluid signal intensity and a median line communication with the fourth ventricle, commonly associated with hydrocephalus. Mega cisterna magna presents as an extraaxial fluid collection posteroinferior to an intact cerebellum. Retrocerebellar arachnoid cysts frequently compress the cerebellar hemispheres and the fourth ventricle. Patients with DWM show an enlarged posterior fossa filled with a cystic structure that communicates freely with the fourth ventricle and hypoplastic vermis. Comprehension of hindbrain embryology is of utmost importance for understanding the cerebellar malformations, including DWM, and other related entities.
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Affiliation(s)
- Gustavo Gumz Correa
- From the *Hospital Moinhos de Vento, Porto Alegre; and †Medimagem, Hospital Beneficiência Portuguesa, São Paulo, Brazil
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7
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Jimenez-Guri E, Pujades C. An ancient mechanism of hindbrain patterning has been conserved in vertebrate evolution. Evol Dev 2011; 13:38-46. [DOI: 10.1111/j.1525-142x.2010.00454.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sturgeon K, Kaneko T, Biemann M, Gauthier A, Chawengsaksophak K, Cordes SP. Cdx1 refines positional identity of the vertebrate hindbrain by directly repressing Mafb expression. Development 2010; 138:65-74. [PMID: 21098558 DOI: 10.1242/dev.058727] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An interplay of transcription factors interprets signalling pathways to define anteroposterior positions along the vertebrate axis. In the hindbrain, these transcription factors prompt the position-appropriate appearance of seven to eight segmental structures, known as rhombomeres (r1-r8). The evolutionarily conserved Cdx caudal-type homeodomain transcription factors help specify the vertebrate trunk and tail but have not been shown to directly regulate hindbrain patterning genes. Mafb (Kreisler, Krml1, valentino), a basic domain leucine zipper transcription factor, is required for development of r5 and r6 and is the first gene to show restricted expression within these two segments. The homeodomain protein vHnf1 (Hnf1b) directly activates Mafb expression. vHnf1 and Mafb share an anterior expression limit at the r4/r5 boundary but vHnf1 expression extends beyond the posterior limit of Mafb and, therefore, cannot establish the posterior Mafb expression boundary. Upon identifying regulatory sequences responsible for posterior Mafb repression, we have used in situ hybridization, immunofluorescence and chromatin immunoprecipitation (ChIP) analyses to determine that Cdx1 directly inhibits early Mafb expression in the neural tube posterior of the r6/r7 boundary, which is the anteriormost boundary of Cdx1 expression in the hindbrain. Cdx1 dependent repression of Mafb is transient. After the 10-somite stage, another mechanism acts to restrict Mafb expression in its normal r5 and r6 domain, even in the absence of Cdx1. Our findings identify Mafb as one of the earliest direct targets of Cdx1 and show that Cdx1 plays a direct role in early hindbrain patterning. Thus, just as Cdx2 and Cdx4 govern the trunk-to-tail transition, Cdx1 may regulate the hindbrain-to-spinal cord transition.
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Affiliation(s)
- Kendra Sturgeon
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, ON M5G 1X5, Canada
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9
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Esain V, Postlethwait JH, Charnay P, Ghislain J. FGF-receptor signalling controls neural cell diversity in the zebrafish hindbrain by regulating olig2 and sox9. Development 2010; 137:33-42. [PMID: 20023158 DOI: 10.1242/dev.038026] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The mechanisms underlying the generation of neural cell diversity are the subject of intense investigation, which has highlighted the involvement of different signalling molecules including Shh, BMP and Wnt. By contrast, relatively little is known about FGF in this process. In this report we identify an FGF-receptor-dependent pathway in zebrafish hindbrain neural progenitors that give rise to somatic motoneurons, oligodendrocyte progenitors and differentiating astroglia. Using a combination of chemical and genetic approaches to conditionally inactivate FGF-receptor signalling, we investigate the role of this pathway. We show that FGF-receptor signalling is not essential for the survival or maintenance of hindbrain neural progenitors but controls their fate by coordinately regulating key transcription factors. First, by cooperating with Shh, FGF-receptor signalling controls the expression of olig2, a patterning gene essential for the specification of somatic motoneurons and oligodendrocytes. Second, FGF-receptor signalling controls the development of both oligodendrocyte progenitors and astroglia through the regulation of sox9, a gliogenic transcription factor the function of which we show to be conserved in the zebrafish hindbrain. Overall, for the first time in vivo, our results reveal a mechanism of FGF in the control of neural cell diversity.
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Affiliation(s)
- Virginie Esain
- INSERM, U784, Laboratoire de Génétique Moléculaire du Développement, 46 rue d'Ulm, 75230 Paris Cedex 05, France
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Aragon F, Pujades C. FGF signaling controls caudal hindbrain specification through Ras-ERK1/2 pathway. BMC DEVELOPMENTAL BIOLOGY 2009; 9:61. [PMID: 19958530 PMCID: PMC2794271 DOI: 10.1186/1471-213x-9-61] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2009] [Accepted: 12/03/2009] [Indexed: 11/10/2022]
Abstract
Background During early steps of embryonic development the hindbrain undergoes a regionalization process along the anterior-posterior (AP) axis that leads to a metameric organization in a series of rhombomeres (r). Refinement of the AP identities within the hindbrain requires the establishment of local signaling centers, which emit signals that pattern territories in their vicinity. Previous results demonstrated that the transcription factor vHnf1 confers caudal identity to the hindbrain inducing Krox20 in r5 and MafB/Kreisler in r5 and r6, through FGF signaling [1]. Results We show that in the chick hindbrain, Fgf3 is transcriptionally activated as early as 30 min after mvHnf1 electroporation, suggesting that it is a direct target of this transcription factor. We also analyzed the expression profiles of FGF activity readouts, such as MKP3 and Pea3, and showed that both are expressed within the hindbrain at early stages of embryonic development. In addition, MKP3 is induced upon overexpression of mFgf3 or mvHnf1 in the hindbrain, confirming vHnf1 is upstream FGF signaling. Finally, we addressed the question of which of the FGF-responding intracellular pathways were active and involved in the regulation of Krox20 and MafB in the hindbrain. While Ras-ERK1/2 activity is necessary for MKP3, Krox20 and MafB induction, PI3K-Akt is not involved in that process. Conclusion Based on these observations we propose that vHnf1 acts directly through FGF3, and promotes caudal hindbrain identity by activating MafB and Krox20 via the Ras-ERK1/2 intracellular pathway.
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Affiliation(s)
- Ferran Aragon
- Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Parc de Recerca Biomèdica de Barcelona, PRBB, Barcelona, Spain.
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Champagnat J, Morin-Surun MP, Fortin G, Thoby-Brisson M. Developmental basis of the rostro-caudal organization of the brainstem respiratory rhythm generator. Philos Trans R Soc Lond B Biol Sci 2009; 364:2469-76. [PMID: 19651648 DOI: 10.1098/rstb.2009.0090] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The Hox genetic network plays a key role in the anteroposterior patterning of the rhombencephalon at pre- and early-segmental stages of development of the neural tube. In the mouse, it controls development of the entire brainstem respiratory neuronal network, including the pons, the parafacial respiratory group (pFRG) and the pre-Bötzinger complex (preBötC). Inactivation of Krox20/Egr2 eliminates the pFRG activity, thereby causing life-threatening neonatal apnoeas alternating with respiration at low frequency. Another respiratory abnormality, the complete absence of breathing, is induced when neuronal synchronization fails to develop in the preBötC. The present paper summarizes data on a third type of respiratory deficits induced by altering Hox function at pontine levels. Inactivation of Hoxa2, the most rostrally expressed Hox gene in the hindbrain, disturbs embryonic development of the pons and alters neonatal inspiratory shaping without affecting respiratory frequency and apnoeas. The same result is obtained by the Phox2a(+/-) mutation modifying the number of petrosal chemoafferent neurons, by eliminating acetylcholinesterase and by altering Hox-dependent development of the pons with retinoic acid administration at embryonic day 7.5. In addition, embryos treated with retinoic acid provide a mouse model for hyperpnoeic episodic breathing, widely reported in pre-term neonates, young girls with Rett's syndrome, patients with Joubert syndrome and adults with Cheyne-Stokes respiration. We conclude that specific respiratory deficits in vivo are assignable to anteroposterior segments of the brainstem, suggesting that the adult respiratory neuronal network is functionally organized according to the rhombomeric, Hox-dependent segmentation of the brainstem in embryos.
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Affiliation(s)
- J Champagnat
- Centre de Recherche de Gif, UPR 2216 (Neurobiologie Génétique et Intégrative), IFR 2118 (Institut de Neurobiologie Alfred Fessard), CNRS, 91198 Gif-sur-Yvette, France.
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12
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A functional interaction between Irx and Meis patterns the anterior hindbrain and activates krox20 expression in rhombomere 3. Dev Biol 2009; 327:566-77. [DOI: 10.1016/j.ydbio.2008.12.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2008] [Revised: 11/17/2008] [Accepted: 12/16/2008] [Indexed: 11/20/2022]
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Sela-Donenfeld D, Kayam G, Wilkinson DG. Boundary cells regulate a switch in the expression of FGF3 in hindbrain rhombomeres. BMC DEVELOPMENTAL BIOLOGY 2009; 9:16. [PMID: 19232109 PMCID: PMC2656489 DOI: 10.1186/1471-213x-9-16] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2008] [Accepted: 02/20/2009] [Indexed: 11/18/2022]
Abstract
Background During formation of the vertebrate central nervous system, the hindbrain is organized into segmental units, called rhombomeres (r). These cell-lineage restricted segments are separated by a subpopulation of cells known as boundary cells. Boundary cells display distinct molecular and cellular properties such as an elongated shape, enriched extracellular matrix components and a reduced proliferation rate compared to intra-rhombomeric cells. However, little is known regarding their functions and the mechanisms that regulate their formation. Results Hindbrain boundary cells express several signaling molecules, such as FGF3, which at earlier developmental stages is transiently expressed in specific rhombomeres. We show that chick embryos that lack boundary cells due to overexpression of truncated EphA4 receptor in the hindbrain have continued segmental expression of FGF3 at stages when it is normally restricted to hindbrain boundaries. Furthermore, surgical ablation of the boundary between r3 and r4, or blocking of the contact of r4 with boundary cells, results in sustained FGF3 expression in this segment. Conclusion These findings suggest that boundary cells are required for the downregulation of segmental FGF3, presumably mediated by a soluble factor(s) that emanates from boundaries. We propose that this new function of boundary cells enables a switch in gene expression that may be required for stage-specific functions of FGF3 in the developing hindbrain.
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Affiliation(s)
- Dalit Sela-Donenfeld
- Koret School of Veterinary Medicine, The Hebrew University, The Robert H Smith Faculty of Agriculture, Food and Environment, Rehovot, Israel.
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Desmazières A, Decker L, Vallat JM, Charnay P, Gilardi-Hebenstreit P. Disruption of Krox20-Nab interaction in the mouse leads to peripheral neuropathy with biphasic evolution. J Neurosci 2008; 28:5891-900. [PMID: 18524893 PMCID: PMC6670318 DOI: 10.1523/jneurosci.5187-07.2008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2007] [Revised: 03/21/2008] [Accepted: 04/21/2008] [Indexed: 11/21/2022] Open
Abstract
Krox20/Egr2 is a zinc finger transcription factor that plays essential roles in several developmental processes, including peripheral nervous system myelination by Schwann cells, where it acts as a master gene regulator. Krox20 is known to interact with cofactors of the Nab family and a mutation affecting isoleucine 268, which prevents this interaction, has been shown to result in congenital hypomyelinating neuropathy in humans. To further investigate the role of this interaction, we have introduced such a mutation, Krox20(I268F), in the mouse germ line. Clinical, immunohistochemical, and ultrastructural analyses of the homozygous mutants reveal that they develop a severe hypomyelination phenotype that mimics the human syndrome. Furthermore, a time-course analysis of the disease indicates that it follows a biphasic evolution, the hypomyelination phase being followed by a dramatic demyelination. Although for the regulation of most analyzed Krox20 target genes the mutation behaves as a loss of function, this is not the case for a few of them. This differential effect indicates that the molecular function of the Krox20-Nab interaction is target dependent and might explain the degradation of the residual myelin, because of imbalances in its composition. In conclusion, this work provides a novel and useful model for severe human peripheral neuropathies.
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Affiliation(s)
- Anne Desmazières
- Inserm U784, 75230 Paris Cedex 05, France
- Ecole Normale Supérieure, 75230 Paris Cedex 05, France, and
| | - Laurence Decker
- Inserm U784, 75230 Paris Cedex 05, France
- Ecole Normale Supérieure, 75230 Paris Cedex 05, France, and
| | - Jean-Michel Vallat
- Laboratoire de Neurologie, Centre Hospitalier Universitaire Dupuytren, 87402 Limoges, France
| | - Patrick Charnay
- Inserm U784, 75230 Paris Cedex 05, France
- Ecole Normale Supérieure, 75230 Paris Cedex 05, France, and
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Maves L, Kimmel CB. Dynamic and sequential patterning of the zebrafish posterior hindbrain by retinoic acid. Dev Biol 2006; 285:593-605. [PMID: 16102743 DOI: 10.1016/j.ydbio.2005.07.015] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2005] [Revised: 06/19/2005] [Accepted: 07/15/2005] [Indexed: 11/24/2022]
Abstract
A prominent region of the vertebrate hindbrain is subdivided along the anterior-posterior axis into a series of seven segments, or rhombomeres. The identity of each rhombomere is specified by the expression of conserved transcription factors, including Krox-20, vHnf1, Val (Kreisler, Mafb) and several Hox proteins. Previous work has shown that retinoic acid (RA) signaling plays a critical role in regulating the expression of these factors and that more posterior rhombomeres require higher levels of RA than more anterior rhombomeres. Models to account for RA concentration dependency have proposed either a static RA gradient or increasing time periods of RA exposure. Here, we provide evidence against both of these models. We show that early zebrafish rhombomere-specification genes, including vhnf1 in r5-r6 and hoxd4a in r7, initiate expression sequentially in the hindbrain, each adjacent to the source of RA synthesis in paraxial mesoderm. By knocking down RA signaling, we show that progressively more posterior rhombomeres require increasingly higher levels of RA signaling, and vhnf1 and hoxd4a expression are particularly RA-dependent. RA synthesis is required just at the time of initiation, but not for maintenance, of vhnf1 and hoxd4a expression. Furthermore, a premature RA increase causes premature activation of vhnf1 and hoxd4a expression. Our results support a new model of dynamic RA action in the hindbrain, in which a temporally increasing source of RA is required to sequentially initiate progressively more posterior rhombomere identities.
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Affiliation(s)
- Lisa Maves
- Institute of Neuroscience, 1254 University of Oregon, Eugene, OR 97403-1254, USA.
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16
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Aragón F, Vázquez-Echeverría C, Ulloa E, Reber M, Cereghini S, Alsina B, Giraldez F, Pujades C. vHnf1regulates specification of caudal rhombomere identity in the chick hindbrain. Dev Dyn 2005; 234:567-76. [PMID: 16110512 DOI: 10.1002/dvdy.20528] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The homeobox-containing gene variant hepatocyte nuclear factor-1 (vHnf1) has recently been shown to be involved in zebrafish caudal hindbrain specification, notably in the activation of MafB and Kro x 20 expression. We have explored this regulatory network in the chick by in ovo electroporation in the neural tube. We show that mis-expression of vHnf1 confers caudal identity to more anterior regions of the hindbrain. Ectopic expression of mvHnf1 leads to ectopic activation of MafB and Kro x 20, and downregulation of Hoxb1 in rhombomere 4. Unexpectedly, mvhnf1 strongly upregulates Fgf3 expression throughout the hindbrain, in both a cell-autonomous and a non-cell-autonomous manner. Blockade of FGF signaling correlates with a selective loss of MafB and Kro x 20 expression, without affecting the expression of vHnf1, Fgf3, or Hoxb1. Based on these observations, we propose that in chick, as in zebrafish, vHnf1 acts with FGF to promote caudal hindbrain identity by activating MafB and Kro x 20 expression. However, our data suggest differences in the vHnf1 downstream cascade in different vertebrates.
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Affiliation(s)
- Ferran Aragón
- Developmental Biology Group, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain
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Hoyle J, Tang YP, Wiellette EL, Wardle FC, Sive H. nlz gene family is required for hindbrain patterning in the zebrafish. Dev Dyn 2004; 229:835-46. [PMID: 15042707 DOI: 10.1002/dvdy.20001] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
This study describes the conserved nlz gene family whose members encode unusual zinc finger proteins. In the zebrafish neurectoderm, both nlz1 and the newly isolated nlz2 are expressed in the presumptive hindbrain and midbrain/hindbrain boundary, where expression of nlz1 is dependent on pax2a. In addition, nlz2 is uniquely expressed more anteriorly, in the presumptive midbrain and diencephalon. Overexpression of Nlz proteins during gastrula stages inhibits hindbrain development. In particular, ectopically expressed Nlz1 inhibits formation of future rhombomeres 2 and 3 (r2, r3), whereas neighboring r1 and r4 are not affected. Conversely, simultaneous reduction of Nlz1 and Nlz2 protein function by expression of antisense morpholino-modified oligomers leads to expansion of future r3 and r5, with associated loss of r4. These data indicate that one function of the nlz gene family is to specify or maintain r4 identity, and to limit r3 and r5 during hindbrain formation.
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Affiliation(s)
- Jacqueline Hoyle
- Whitehead Institute for Biomedical Research, Nine Cambridge Center, Cambridge, Massachusetts, USA
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18
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Abstract
Since a dozen years, biology is in a state of permanent technical and conceptual excitement. The pendulum is swinging back from the selectionist populationist biology of Darwin--the organism is a black box: viewed from the outside--to the mechanistic embryology of Aristotle--viewed from the inside of the organism--leading to a new interpretation of old concepts. This short text tries to get to the meaning of these events by putting them in historical and epistemological perspectives, through such concepts as teleology and differentiation, on the way describing several paradoxes: experimental results yield a detailed description of purposeless mechanical devices, explaining Nature, which, to us, appears purposeful.
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Affiliation(s)
- André Weydert
- Department of Developmental Biology, Institut Pasteur, Pavillon Louis-Martin n 10, 25-28, rue du Docteur-Roux, 75724 Paris 15, France.
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19
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Diman NYSG, Chauvier E, Pacico N, Picard JJ, Rezsohazy R. The proximal 2-kb of the Hoxa3 promoter directs gene expression in distinct branchial compartments and cranial ganglia. BRAIN RESEARCH. DEVELOPMENTAL BRAIN RESEARCH 2004; 150:211-3. [PMID: 15158084 DOI: 10.1016/j.devbrainres.2004.03.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/31/2004] [Indexed: 11/28/2022]
Abstract
Developing structures such as hindbrain, neural crest cells or spinal cord express Hoxa3. Here, we have investigated the regulatory role of a 2-kb fragment spanning the proximal promoter of Hoxa3 by a reporter-based approach in mice. We show that this fragment promotes reporter activity in ganglionic and branchial compartments known to express Hoxa3 but for which no cis-regulatory elements have been identified so far. We also show that the 2-kb promoter fragment is active in rhombomere 4 and in the ganglion of the cranial nerve complex VII/VIII that are devoid of Hoxa3 expression.
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Affiliation(s)
- Nata Y S-G Diman
- Unit of Developmental Genetics, Université Catholique de Louvain, 73 (box 82) Avenue Mounier, Brussels 1200, Belgium
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20
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Lecaudey V, Anselme I, Rosa F, Schneider-Maunoury S. The zebrafish Iroquois gene iro7 positions the r4/r5 boundary and controls neurogenesis in the rostral hindbrain. Development 2004; 131:3121-31. [PMID: 15175248 DOI: 10.1242/dev.01190] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Early brain regionalisation involves the activation of genes coding for transcription factors in distinct domains of the neural plate. The limits of these domains often prefigure morphological boundaries. In the hindbrain, anteroposterior patterning depends on a segmentation process that leads to the formation of seven bulges called rhombomeres (r). The molecular cues involved in the early subdivision of the hindbrain and in rhombomere formation are not well understood. We show that iro7, a zebrafish gene coding for a transcription factor of the Iroquois family, is expressed at the end of gastrulation in the future midbrain and hindbrain territories up to the prospective r4/r5 boundary. This territory is strictly complementary to the expression domain of another homeobox gene, vhnf1, in the caudal neural plate. We demonstrate that Iro7 represses vhnf1 expression anterior to their common border and that, conversely, vHnf1 represses iro7 expression caudal to it. This suggests that the r4/r5 boundary is positioned by mutual repression between these two transcription factors. In addition, iro7 is involved in the specification of primary neurons in the rostral hindbrain. In particular, it is essential for the formation of the Mauthner neurons in r4. We propose that iro7 has a dual function in the hindbrain of the zebrafish embryo: it is required for the proper positioning of the prospective r4/r5 boundary and it promotes neurogenesis in the anterior hindbrain.
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Affiliation(s)
- Virginie Lecaudey
- Unité de Biologie Moléculaire du Développement, Unité INSERM 368, Ecole Normale Supérieure, 46, rue d'Ulm, 75005 Paris, France
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21
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Borday C, Wrobel L, Fortin G, Champagnat J, Thaëron-Antôno C, Thoby-Brisson M. Developmental gene control of brainstem function: views from the embryo. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2004; 84:89-106. [PMID: 14769431 DOI: 10.1016/j.pbiomolbio.2003.11.002] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The respiratory rhythm is generated within the hindbrain reticular formation, rostrally in the vicinity of the facial nucleus and caudally within the vagal/glossopharyngeal domain. This is probably one of the best models to understand how genes have been selected and conserved to control adaptive behaviour in vertebrates. The para-facial region is well understood with respect to the transcription factors that underlie antero-posterior specification of neural progenitors in the embryo. Hox paralogs and Hox-regulating genes kreisler and Krox-20 govern transient formation of developmental compartments, the rhombomeres, in which rhythmic neuronal networks develop. Hox are master genes selecting and coordinating the developmental fate of reticular and motor neurons thereby specifying patterns of motor activities operating throughout life. Neuronal function and development are also tightly linked in the vagal/glossopharyngeal domain. At this level, bdnf acts as a neurotrophin of peripheral chemoafferent neural populations and as a neuromodulator of the central rhythmogenic respiratory circuits. A general view is now emerging on the role of developmental transcription and trophic factors allowing the coordinated integration of different neuronal types to produce, and eventually refine, respiratory rhythmic pattern in a use-dependent manner.
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Affiliation(s)
- Caroline Borday
- UPR 2216 Neurobiologie Génétique et Intégrative, Institut de Neurobiologie Alfred Fessard, CNRS, 1, av de la Terrasse, Gif-sur-Yvette 91198, France
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22
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Lampe X, Picard JJ, Rezsohazy R. The Hoxa2 enhancer 2 contains a critical Hoxa2 responsive regulatory element. Biochem Biophys Res Commun 2004; 316:898-902. [PMID: 15033486 DOI: 10.1016/j.bbrc.2004.02.138] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2004] [Indexed: 11/26/2022]
Abstract
Rhombomeres are embryonic territories arising from the transient segmentation of the hindbrain. Their identity is specified by Hox genes from paralogous groups 1-4. Hoxa2 is the only Hox gene to be expressed in the second rhombomere and the regulatory cues leading to this region-specific expression have been poorly investigated. A 2.5-kb DNA fragment overlapping with the 3' end of Hoxa2 was previously shown to specifically direct the expression of a reporter gene in the second rhombomere and the rostral somites of mouse embryos. Here, we report that this enhancer region is activated in vitro by Hoxa2 and that this activation is strictly dependent on a short 10-bp sequence matching the consensus for Hox-Pbx recognition sites.
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Affiliation(s)
- Xavier Lampe
- Unit of Developmental Genetics, Université catholique de Louvain, 73 (boîte 82) avenue Mounier, B-1200 Brussels, Belgium
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23
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Santagati F, Rijli FM. Cranial neural crest and the building of the vertebrate head. Nat Rev Neurosci 2003; 4:806-18. [PMID: 14523380 DOI: 10.1038/nrn1221] [Citation(s) in RCA: 319] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Fabio Santagati
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique, Université Lousis Pasteur, BP 10142-67404 Illkirch Cedex, CU de Strasbourg, France
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24
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Mechta-Grigoriou F, Giudicelli F, Pujades C, Charnay P, Yaniv M. c-jun regulation and function in the developing hindbrain. Dev Biol 2003; 258:419-31. [PMID: 12798298 DOI: 10.1016/s0012-1606(03)00135-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Hindbrain development is a well-characterised segmentation process in vertebrates. The bZip transcription factor MafB/kreisler is specifically expressed in rhombomeres (r) 5 and 6 of the developing vertebrate hindbrain and is required for proper caudal hindbrain segmentation. Here, we provide evidence that the mouse protooncogene c-jun, which encodes a member of the bZip family, is coexpressed with MafB in prospective r5 and r6. Analysis of mouse mutants suggests that c-jun expression in these territories is dependent on MafB but independent of the zinc-finger transcription factor Krox20, another essential determinant of r5 development. Loss- and gain-of-function studies, performed in mouse and chick embryos, respectively, demonstrate that c-Jun participates, together with MafB and Krox20, in the transcriptional activation of the Hoxb3 gene in r5. The action of c-Jun is likely to be direct, since c-Jun homodimers and c-Jun/MafB heterodimers can bind to essential regulatory elements within the transcriptional enhancer responsible for Hoxb3 expression in r5. These data indicate that c-Jun acts both as a downstream effector and a cofactor of MafB and belongs to the complex network of factors governing hindbrain patterning.
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Affiliation(s)
- Fatima Mechta-Grigoriou
- Unité Expression génétique et maladies, CNRS URA 1644, Institut Pasteur 25, rue du Docteur Roux, 75724 15, Paris Cedex, France.
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25
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Giudicelli F, Gilardi-Hebenstreit P, Mechta-Grigoriou F, Poquet C, Charnay P. Novel activities of Mafb underlie its dual role in hindbrain segmentation and regional specification. Dev Biol 2003; 253:150-62. [PMID: 12490204 DOI: 10.1006/dbio.2002.0864] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The bZip transcription factor Mafb is expressed in two segments of the developing vertebrate hindbrain: the rhombomeres 5 and 6. Loss of Mafb expression in the mouse mutant kreisler leads to elimination of r5 and to alterations of r6 regional identity. Here, we further investigated the role of Mafb in hindbrain patterning using gain-of-function experiments in the chick embryo. Our work has revealed novel functions for Mafb, including a positive autoregulatory activity, the capacity to repress Hoxb1 expression, and the capacity to synergise with or antagonise Krox20 activity. These different activities appear to be spatially restricted in the hindbrain, presumably due to interactions with other factors. Reinvestigation of the kreisler mutation indicated that it also results in an ectopic activation of Mafb in rhombomere 3, accounting for the previously described molecular alterations of this rhombomere in the mutant. Together, these data allow us to refine our view of the dual function of Mafb in both segmentation and specification of anteroposterior identity in the hindbrain.
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Affiliation(s)
- François Giudicelli
- Unité 368 de l'Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d'Ulm, 75230, Paris Cedex 05, France
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26
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Lemaire P, Bertrand V, Hudson C. Early steps in the formation of neural tissue in ascidian embryos. Dev Biol 2002; 252:151-69. [PMID: 12482707 DOI: 10.1006/dbio.2002.0861] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ascidians are simple invertebrate chordates whose lineage diverged from that of vertebrates at the base of the chordate tree. Their larvae display a typical chordate body plan, but are composed of a remarkably small number of cells. Ascidians develop with an invariant cell lineage, and their embryos can be easily experimentally manipulated during the cleavage stages. Their larval nervous system is organised in a similar way as in vertebrates but is composed of less than 130 neurones and around 230 glial cells. This remarkable simplicity offers an opportunity to understand, at the cellular and molecular levels, the ontogeny and function of each neural cell. Here, we first review the organisation of the ascidian nervous system and its lineage. We then focus on the current understanding of the processes of neural specification and patterning before and during gastrulation. We discuss these advances in the context of what is currently known in vertebrates.
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Affiliation(s)
- P Lemaire
- Institut de Biologie du Développement de Marseille, Laboratoire de Génétique et Physiologie du Développement, CNRS Université de la Méditerranée, Case 907, Campus de Luminy, F-13288 Marseille, France.
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27
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Abstract
Posterior fossa malformations are a special group of central nervous system anomalies that present during infancy with hypotonia, developmental delay, microcephaly, or hydrocephalus. Recent discoveries of the genetic and epigenetic factors that control hindbrain ontogenesis explain some of these disturbances in cerebellar development. A comprehensive classification of posterior fossa malformations is proposed with particular attention to Dandy-Walker malformation, Joubert syndrome, and other cerebellar hypoplasias. A rare form of cerebellar hypertrophy which caused repeated obstruction at the foramen magnum is recognized. The importance of the cerebellum in language, cognition, and brain growth is stressed.
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Affiliation(s)
- Charles E Niesen
- Division of Pediatric Neurology, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
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28
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Maves L, Jackman W, Kimmel CB. FGF3 and FGF8 mediate a rhombomere 4 signaling activity in the zebrafish hindbrain. Development 2002; 129:3825-37. [PMID: 12135921 DOI: 10.1242/dev.129.16.3825] [Citation(s) in RCA: 137] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The segmentation of the vertebrate hindbrain into rhombomeres is highly conserved, but how early hindbrain patterning is established is not well understood. We show that rhombomere 4 (r4) functions as an early-differentiating signaling center in the zebrafish hindbrain. Time-lapse analyses of zebrafish hindbrain development show that r4 forms first and hindbrain neuronal differentiation occurs first in r4. Two signaling molecules, FGF3 and FGF8, which are both expressed early in r4, are together required for the development of rhombomeres adjacent to r4, particularly r5 and r6. Transplantation of r4 cells can induce expression of r5/r6 markers, as can misexpression of either FGF3 or FGF8. Genetic mosaic analyses also support a role for FGF signaling acting from r4. Taken together, our findings demonstrate a crucial role for FGF-mediated inter-rhombomere signaling in promoting early hindbrain patterning and underscore the significance of organizing centers in patterning the vertebrate neural plate.
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Affiliation(s)
- Lisa Maves
- Institute of Neuroscience, 1254 University of Oregon, Eugene, OR 97403-1254, USA.
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29
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Manzanares M, Nardelli J, Gilardi-Hebenstreit P, Marshall H, Giudicelli F, Martínez-Pastor MT, Krumlauf R, Charnay P. Krox20 and kreisler co-operate in the transcriptional control of segmental expression of Hoxb3 in the developing hindbrain. EMBO J 2002; 21:365-76. [PMID: 11823429 PMCID: PMC125344 DOI: 10.1093/emboj/21.3.365] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In the segmented vertebrate hindbrain, the Hoxa3 and Hoxb3 genes are expressed at high relative levels in the rhombomeres (r) 5 and 6, and 5, respectively. The single enhancer elements responsible for these activities have been identified previously and shown to constitute direct targets of the transcription factor kreisler, which is expressed in r5 and r6. Here, we have analysed the contribution of the transcription factor Krox20, present in r3 and r5. Genetic analyses demonstrated that Krox20 is required for activity of the Hoxb3 r5 enhancer, but not of the Hoxa3 r5/6 enhancer. Mutational analysis of the Hoxb3 r5 enhancer, together with ectopic expression experiments, revealed that Krox20 binds to the enhancer and synergizes with kreisler to promote Hoxb3 transcription, restricting enhancer activity to their domain of overlap, r5. These analyses also suggested contributions from an Ets-related factor and from putative factors likely to heterodimerize with kreisler. The integration of multiple independent inputs present in overlapping domains by a single enhancer is likely to constitute a general mechanism for the patterning of subterritories during vertebrate development.
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Affiliation(s)
- Miguel Manzanares
- Division of Developmental Neurobiology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK and Unité 368 de I’Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d’Ulm, F-75230 Paris Cedex 05, France Present address: Department of Developmental Neurobiology, Insituto Cajal, CSIC, Av. Doctor Arce 37, E-28002 Madrid, Spain Present address: UMR 7000 du Centre National de la Recherche Scientifique, CHU Pitié-Salpêtrière, 105 bd de l’Hôpital, 75013 Paris, France Present address: Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, MO 64110, USA Corresponding author e-mail: M.Manzanares and J.Nardelli contributed equally to this work
| | - Jeannette Nardelli
- Division of Developmental Neurobiology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK and Unité 368 de I’Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d’Ulm, F-75230 Paris Cedex 05, France Present address: Department of Developmental Neurobiology, Insituto Cajal, CSIC, Av. Doctor Arce 37, E-28002 Madrid, Spain Present address: UMR 7000 du Centre National de la Recherche Scientifique, CHU Pitié-Salpêtrière, 105 bd de l’Hôpital, 75013 Paris, France Present address: Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, MO 64110, USA Corresponding author e-mail: M.Manzanares and J.Nardelli contributed equally to this work
| | - Pascale Gilardi-Hebenstreit
- Division of Developmental Neurobiology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK and Unité 368 de I’Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d’Ulm, F-75230 Paris Cedex 05, France Present address: Department of Developmental Neurobiology, Insituto Cajal, CSIC, Av. Doctor Arce 37, E-28002 Madrid, Spain Present address: UMR 7000 du Centre National de la Recherche Scientifique, CHU Pitié-Salpêtrière, 105 bd de l’Hôpital, 75013 Paris, France Present address: Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, MO 64110, USA Corresponding author e-mail: M.Manzanares and J.Nardelli contributed equally to this work
| | - Heather Marshall
- Division of Developmental Neurobiology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK and Unité 368 de I’Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d’Ulm, F-75230 Paris Cedex 05, France Present address: Department of Developmental Neurobiology, Insituto Cajal, CSIC, Av. Doctor Arce 37, E-28002 Madrid, Spain Present address: UMR 7000 du Centre National de la Recherche Scientifique, CHU Pitié-Salpêtrière, 105 bd de l’Hôpital, 75013 Paris, France Present address: Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, MO 64110, USA Corresponding author e-mail: M.Manzanares and J.Nardelli contributed equally to this work
| | - François Giudicelli
- Division of Developmental Neurobiology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK and Unité 368 de I’Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d’Ulm, F-75230 Paris Cedex 05, France Present address: Department of Developmental Neurobiology, Insituto Cajal, CSIC, Av. Doctor Arce 37, E-28002 Madrid, Spain Present address: UMR 7000 du Centre National de la Recherche Scientifique, CHU Pitié-Salpêtrière, 105 bd de l’Hôpital, 75013 Paris, France Present address: Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, MO 64110, USA Corresponding author e-mail: M.Manzanares and J.Nardelli contributed equally to this work
| | - María Teresa Martínez-Pastor
- Division of Developmental Neurobiology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK and Unité 368 de I’Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d’Ulm, F-75230 Paris Cedex 05, France Present address: Department of Developmental Neurobiology, Insituto Cajal, CSIC, Av. Doctor Arce 37, E-28002 Madrid, Spain Present address: UMR 7000 du Centre National de la Recherche Scientifique, CHU Pitié-Salpêtrière, 105 bd de l’Hôpital, 75013 Paris, France Present address: Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, MO 64110, USA Corresponding author e-mail: M.Manzanares and J.Nardelli contributed equally to this work
| | - Robb Krumlauf
- Division of Developmental Neurobiology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK and Unité 368 de I’Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d’Ulm, F-75230 Paris Cedex 05, France Present address: Department of Developmental Neurobiology, Insituto Cajal, CSIC, Av. Doctor Arce 37, E-28002 Madrid, Spain Present address: UMR 7000 du Centre National de la Recherche Scientifique, CHU Pitié-Salpêtrière, 105 bd de l’Hôpital, 75013 Paris, France Present address: Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, MO 64110, USA Corresponding author e-mail: M.Manzanares and J.Nardelli contributed equally to this work
| | - Patrick Charnay
- Division of Developmental Neurobiology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK and Unité 368 de I’Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d’Ulm, F-75230 Paris Cedex 05, France Present address: Department of Developmental Neurobiology, Insituto Cajal, CSIC, Av. Doctor Arce 37, E-28002 Madrid, Spain Present address: UMR 7000 du Centre National de la Recherche Scientifique, CHU Pitié-Salpêtrière, 105 bd de l’Hôpital, 75013 Paris, France Present address: Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, MO 64110, USA Corresponding author e-mail: M.Manzanares and J.Nardelli contributed equally to this work
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30
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Voiculescu O, Taillebourg E, Pujades C, Kress C, Buart S, Charnay P, Schneider-Maunoury S. Hindbrain patterning: Krox20 couples segmentation and specification of regional identity. Development 2001; 128:4967-78. [PMID: 11748134 DOI: 10.1242/dev.128.24.4967] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We have previously demonstrated that inactivation of the Krox20 gene led to the disappearance of its segmental expression territories in the hindbrain, the rhombomeres (r) 3 and 5. We now performed a detailed analysis of the fate of prospective r3 and r5 cells in Krox20 mutant embryos. Genetic fate mapping indicates that at least some of these cells persist in the absence of a functional Krox20 protein and uncovers the requirement for autoregulatory mechanisms in the expansion and maintenance of Krox20-expressing territories. Analysis of even-numbered rhombomere molecular markers demonstrates that in Krox20-null embryos, r3 cells acquire r2 or r4 identity, and r5 cells acquire r6 identity. Finally, study of embryonic chimaeras between Krox20 homozygous mutant and wild-type cells shows that the mingling properties of r3/r5 mutant cells are changed towards those of even-numbered rhombomere cells. Together, these data demonstrate that Krox20 is essential to the generation of alternating odd- and even-numbered territories in the hindbrain and that it acts by coupling the processes of segment formation, cell segregation and specification of regional identity.
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Affiliation(s)
- O Voiculescu
- Laboratoire de Biologie Moléculaire du Développement, INSERM U368, Ecole Normale Supérieure, 46 rue d'Ulm, 75230 Paris Cedex 05, France
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31
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Fan M, Mi R, Yew DT, Chan WY. Analysis of gene expression following sciatic nerve crush and spinal cord hemisection in the mouse by microarray expression profiling. Cell Mol Neurobiol 2001; 21:497-508. [PMID: 11860187 DOI: 10.1023/a:1013867306555] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
1. The responses of periphery (PNS) and central nervous systems (CNS) towards nerve injury are different: while injured mammalian periphery nerons can successfully undergo regeneration, axons in the central nervous system are usually not able to regenerate. 2. In the present study, the genes which were differentially expressed in the PNS and CNS following nerve injury were identified and compared by microarray profiling techniques. 3. Sciatic nerve crush and hemisection of the spinal cord of adult mice were used as the models for nerve injury in PNS and CNS respectivey. 4. It was found that of all the genes examined, 14% (80/588) showed changes in expression following either PNS or CNS injury, and only 3% (18/588) showed changes in both types of injuries. 5. Among all the differentially expressed genes, only 8% (6/80) exhibited similar changes in gene expression (either up- or down-regulation) following injury in both PNS and CNS nerve injuries. 6. Our results indicated that microarray expression profiling is an efficient and useful method to identify genes that are involved in the regeneration process following nerve injuries, and several genes which are differentially expressed in the PNS and/or CNS following nerve injuries were identified in the present study.
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Affiliation(s)
- M Fan
- Institute of Basic Medical Science, Academy of Military Science, Beijing, People's Republic of China
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32
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Giudicelli F, Taillebourg E, Charnay P, Gilardi-Hebenstreit P. Krox-20 patterns the hindbrain through both cell-autonomous and non cell-autonomous mechanisms. Genes Dev 2001; 15:567-80. [PMID: 11238377 PMCID: PMC312642 DOI: 10.1101/gad.189801] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2000] [Accepted: 01/05/2001] [Indexed: 11/25/2022]
Abstract
The Krox-20 gene encodes a zinc finger transcription factor, which has been shown previously, by targeted inactivation in the mouse, to be required for the development of rhombomeres (r) 3 and 5 in the segmented embryonic hindbrain. In the present work, Krox-20 was expressed ectopically in the developing chick hindbrain by use of electroporation. We demonstrate that Krox-20 expression is sufficient to confer odd-numbered rhombomere characteristics to r2, r4, and r6 cells, presumably in a cell-autonomous manner. Therefore, Krox-20, appears as the major determinant of odd-numbered identity within the hindbrain. In addition, we provide evidence for the existence of a non cell-autonomous autoactivation mechanism allowing recruitment of Krox-20-positive cells from even-numbered territories by neighboring Krox-20-expressing cells. On the basis of these observations, we propose that Krox-20 regulates multiple, intertwined steps in segmental patterning: Initial activation of Krox-20 in a few cells leads to the segregation, homogenization, and possibly expansion of territories to which Krox-20 in addition confers an odd-numbered identity.
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Affiliation(s)
- F Giudicelli
- Unité 368 de l'Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 75230 Paris Cedex 05, France
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Garel S, Garcia-Dominguez M, Charnay P. Control of the migratory pathway of facial branchiomotor neurones. Development 2000; 127:5297-307. [PMID: 11076752 DOI: 10.1242/dev.127.24.5297] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Facial branchiomotor (fbm) neurones undergo a complex migration in the segmented mouse hindbrain. They are born in the basal plate of rhombomere (r) 4, migrate caudally through r5, and then dorsally and radially in r6. To study how migrating cells adapt to their changing environment and control their pathway, we have analysed this stereotyped migration in wild-type and mutant backgrounds. We show that during their migration, fbm neurones regulate the expression of genes encoding the cell membrane proteins TAG-1, Ret and cadherin 8. Specific combinations of these markers are associated with each migratory phase in r4, r5 and r6. In Krox20 and kreisler mutant mouse embryos, both of which lack r5, fbm neurones migrate dorsally into the anteriorly positioned r6 and adopt an r6-specific expression pattern. In embryos deficient for Ebf1, a gene normally expressed in fbm neurones, part of the fbm neurones migrate dorsally within r5. Accordingly, fbm neurones prematurely express a combination of markers characteristic of an r6 location. These data suggest that fbm neurones adapt to their changing environment by switching on and off specific genes, and that Ebf1 is involved in the control of these responses. In addition, they establish a close correlation between the expression pattern of fbm neurones and their migratory behaviour, suggesting that modifications in gene expression participate in the selection of the local migratory pathway.
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Affiliation(s)
- S Garel
- Unité 368 de l'Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 75230 Paris Cedex 05, France
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White JC, Highland M, Clagett-Dame M. Abnormal development of the sinuatrial venous valve and posterior hindbrain may contribute to late fetal resorption of vitamin A-deficient rat embryos. TERATOLOGY 2000; 62:374-84. [PMID: 11091359 DOI: 10.1002/1096-9926(200012)62:6<374::aid-tera4>3.0.co;2-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
BACKGROUND Normal embryonic development and survival in utero is dependent on an adequate supply of vitamin A. Embryos from vitamin A-deficient (VAD) pregnant rats fed an inadequate amount of all-trans retinoic acid (atRA; 12 microg per g of diet or approximately 230 microg per rat per day) exhibit severe developmental abnormalities of the anterior cardinal vein and hindbrain by embryonic day (E) 12.5 and die shortly thereafter. METHODS In the present study, we sought to determine whether supplementation of VAD-RA supported (12 microg per g of diet) pregnant rats with retinol (ROL) at the late-gastrula (presomite or rat E9.5) or early somite stages (E10.5), or provision of higher levels of atRA throughout this period could prevent abnormalities in the developing cardiovascular and nervous systems. RESULTS A newly described defect in the sinuatrial venus valve along with enlarged anterior cardinal veins and nervous system abnormalities and the later death of embryos are prevented by supplementing pregnant animals with ROL on the morning of E9.5. If ROL supplementation is delayed by 1 day (E10.5), most embryos are abnormal and die by E18.5. Supplementation of VAD rats with atRA (250 microg per g of diet) between E8.5 and E10.5 also prevents the cardiovascular and nervous system abnormalities and a significant number of these embryos survive to parturition. Thus, high levels of atRA can obviate the need for ROL between E9.5 and E10.5. CONCLUSIONS These results support an essential role for retinoid signaling between the late gastrula and early somite stages in the rat embryo for normal morphogenesis of the primitive heart tube and the posterior hindbrain. Further, these results suggest that embryonic death occurring at midgestation in the VAD rat may be linked to the abnormal development of one or both of these embryonic structures.
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Affiliation(s)
- J C White
- School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53706-1508, USA
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Marín F, Charnay P. Hindbrain patterning: FGFs regulate Krox20 and mafB/kr expression in the otic/preotic region. Development 2000; 127:4925-35. [PMID: 11044406 DOI: 10.1242/dev.127.22.4925] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Krox20 and mafB/kr are regulatory genes involved in hindbrain segmentation and anteroposterior (AP) patterning. They are expressed in rhombomeres (r) r3/r5 and r5/r6 respectively, as well as in the r5/r6 neural crest. Since several members of the fibroblast growth factor (FGF) family are expressed in the otic/preotic region (r2-r6), we investigated their possible involvement in the regulation of Krox20 and mafB/kr. Application of exogenous FGFs to the neural tube of 4- to 7-somite chick embryos led to ectopic expression in the neural crest of the somitic hindbrain (r7 and r8) and to the extension of the Krox20- or mafB/kr-positive areas in the neuroepithelium. Application of an inhibitor of FGF signalling led to severe and specific downregulation of Krox20 and mafB/kr in the hindbrain neuroepithelium and neural crest. These data indicate that FGFs are involved in the control of regional induction and/or maintenance of Krox20 and mafB/kr expression, thus identifying a novel function for these factors in hindbrain development, besides their proposed more general role in early neural caudalisation.
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Affiliation(s)
- F Marín
- Unité 368 de l'Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 75230 Paris Cedex 05, France
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Fortin G, del Toro ED, Abadie V, Guimarães L, Foutz AS, Denavit-Saubié M, Rouyer F, Champagnat J. Genetic and developmental models for the neural control of breathing in vertebrates. RESPIRATION PHYSIOLOGY 2000; 122:247-57. [PMID: 10967348 DOI: 10.1016/s0034-5687(00)00163-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The present paper reviews some of the possible mechanisms that may link gene function in the brainstem and breathing patterns in vertebrates. On one hand, adaptation and acclimatisation of mature breathing to environmental constraints such as hypoxia, involves complex regulation of the gene expression in precise cardiorespiratory sites of the brainstem. On the other hand, targeted inactivation of different genes suggests that postnatal respiratory variables at rest depend on genes controlling the prenatal development of the brainstem. During embryogenesis, neurotrophins (gdnf, bdnf) regulate the survival of specific cellular populations composing the respiratory neuronal network. The expression of developmental genes such as Hox and Krox-20 initiates hindbrain segmentation, the earliest sign of regionalisation in the brainstem. As shown in the chick embryo, segmental specifications allow the establishment of an active embryonic rhythmic network and later insertion of specific neuronal circuits increasing the primordial rhythm frequency to near mature values.
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Affiliation(s)
- G Fortin
- U.P.R. 2216, Neurobiologie Génétique et Intégrative, C.N.R.S., Avenue de la Terrasse, Bâtiment 33, 91198, Gif-sur-Yvette, France
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Marín F, Charnay P. Positional regulation of Krox-20 and mafB/kr expression in the developing hindbrain: potentialities of prospective rhombomeres. Dev Biol 2000; 218:220-34. [PMID: 10656765 DOI: 10.1006/dbio.1999.9538] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Krox-20 and mafB/kr encode transcription factors involved in the control of hindbrain development and are expressed in rhombomeres (r) 3 and 5 and 5 and 6, respectively. To analyse the regulation of the expression of these genes by positional cues, focusing on the stages just preceding the formation of rhombomeres, we have performed ectopic grafts involving single prospective rhombomeres (pr) or couples of pr on 4-6 somite avian embryos. Transplantation of pr6 in the pr5 position leads to Krox-20 activation and grafting of pr7 in the pr5 position results in mafB/kr activation. Furthermore, pr6 grafted in the pr5 position develops an r5-like cytoarchitecture. These data establish that rostral transplantation can lead to anteriorization within the hindbrain. However, additional experiments indicate that the competence of the transplanted tissue for such anteriorization appears limited and that transformations corresponding to shifts of a single rhombomere are favoured. We also show that caudal transplantation of pr5 into the pr6 position can lead to a down-regulation of Krox-20 expression consistent with posteriorization, suggesting that caudalizing influences are present within the nonsomitic hindbrain after the 4- to 6-somite stage. Finally, combinations of extirpation and grafting experiments suggest that the regulation of mafB/kr expression in the r6-r7 region may involve anteriorizing influences in addition to previously identified posteriorizing signals from the somitic region.
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Affiliation(s)
- F Marín
- Unité 368 de l'Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, 46 rue d'Ulm, Paris Cedex 05, 75230, France
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Mechta-Grigoriou F, Garel S, Charnay P. Nab proteins mediate a negative feedback loop controlling Krox-20 activity in the developing hindbrain. Development 2000; 127:119-28. [PMID: 10654606 DOI: 10.1242/dev.127.1.119] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The developing vertebrate hindbrain is transiently subdivided along the anterior-posterior axis into metameric units, called rhombomeres (r). These segments constitute units of lineage restriction and display specific gene expression patterns. The transcription factor gene Krox-20 is restricted to r3 and r5, and is required for the development of these rhombomeres. We present evidence that Krox-20 transcriptional activity is under the control of a negative feedback mechanism in the hindbrain. This regulatory loop involves two closely related proteins, Nabl and Nab2, previously identified as antagonists of Krox-20 transcriptional activity in cultured cells. Here we show that in the mouse hindbrain, Nab1 and Nab2 recapitulate the Krox-20 expression pattern and that their expression is dependent on Krox-20 function. Furthermore, misexpression of Nab1 or Nab2 in zebrafish embryos leads to alterations in the expression patterns of several hindbrain markers, consistent with an inhibition of Krox-20 activity. Taken together, these data indicate that Krox-20 positively regulates the expression of its own antagonists and raise the possibility that this negative feedback regulatory loop may play a role in the control of hindbrain development.
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Affiliation(s)
- F Mechta-Grigoriou
- Unité 368 de l'Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, Paris France
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Abadie V, Champagnat J, Fortin G, Couly G. [Sucking-deglutition-respiration and brain stem development genes]. Arch Pediatr 1999; 6:1043-7. [PMID: 10544777 DOI: 10.1016/s0929-693x(00)86976-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rockett JC, Esdaile DJ, Gibson GG. Differential gene expression in drug metabolism and toxicology: practicalities, problems and potential. Xenobiotica 1999; 29:655-91. [PMID: 10456687 DOI: 10.1080/004982599238317] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
1. An important feature of the work of many molecular biologists is identifying which genes are switched on and off in a cell under different environmental conditions or subsequent to xenobiotic challenge. Such information has many uses, including the deciphering of molecular pathways and facilitating the development of new experimental and diagnostic procedures. However, the student of gene hunting should be forgiven for perhaps becoming confused by the mountain of information available as there appears to be almost as many methods of discovering differentially expressed genes as there are research groups using the technique. 2. The aim of this review was to clarify the main methods of differential gene expression analysis and the mechanistic principles underlying them. Also included is a discussion on some of the practical aspects of using this technique. Emphasis is placed on the so-called 'open' systems, which require no prior knowledge of the genes contained within the study model. Whilst these will eventually be replaced by 'closed' systems in the study of human, mouse and other commonly studied laboratory animals, they will remain a powerful tool for those examining less fashionable models. 3. The use of suppression-PCR subtractive hybridization is exemplified in the identification of up- and down-regulated genes in rat liver following exposure to phenobarbital, a well-known inducer of the drug metabolizing enzymes. 4. Differential gene display provides a coherent platform for building libraries and microchip arrays of 'gene fingerprints' characteristic of known enzyme inducers and xenobiotic toxicants, which may be interrogated subsequently for the identification and characterization of xenobiotics of unknown biological properties.
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Affiliation(s)
- J C Rockett
- Molecular Toxicology Laboratory, School of Biological Sciences, University of Surrey, Guildford, UK
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