1
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Kim SE, Kim HY, Wlodarczyk BJ, Finnell RH. The novel linkage between Fuz and Gpr161 genes regulates sonic hedgehog signaling during mouse embryonic development. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.11.575263. [PMID: 38260275 PMCID: PMC10802560 DOI: 10.1101/2024.01.11.575263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Sonic hedgehog (Shh) signaling regulates embryonic morphogenesis utilizing primary cilia, the cell antenna acting as a signaling hub. Fuz, an effector of planar cell polarity (PCP) signaling, involves Shh signaling via cilia formation, while the G protein-coupled receptor 161 (Gpr161) is a negative regulator of Shh signaling. The range of phenotypic malformations observed in mice bearing mutations in either of these two genes is similar; however, their functional relations have not been previously explored. This study identified the genetic and biochemical link between Fuz and Gpr161 in mouse embryonic development. Fuz was genetically epistatic to Gpr161 via Shh signaling during mouse embryonic development. The FUZ biochemically interacted with GPR161, and Fuz regulated Gpr161 ciliary trafficking via β-arrestin2. Our study suggested the novel Gpr161-Fuz axis that regulates Shh signaling during mouse embryonic development.
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Affiliation(s)
- Sung-Eun Kim
- Department of Pediatrics, Dell Pediatric Research Institute, The University of Texas at Austin/Dell Medical School, Austin, TX, 78723, USA
| | | | - Bogdan J. Wlodarczyk
- Departments of Molecular and Cellular Biology, Molecular and Human Genetics, and Medicine, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Richard H. Finnell
- Department of Pediatrics, Dell Pediatric Research Institute, The University of Texas at Austin/Dell Medical School, Austin, TX, 78723, USA
- Departments of Molecular and Cellular Biology, Molecular and Human Genetics, and Medicine, Baylor College of Medicine, Houston, TX, 77030, USA
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2
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Miozzo F, Valencia-Alarcón EP, Stickley L, Majcin Dorcikova M, Petrelli F, Tas D, Loncle N, Nikonenko I, Bou Dib P, Nagoshi E. Maintenance of mitochondrial integrity in midbrain dopaminergic neurons governed by a conserved developmental transcription factor. Nat Commun 2022; 13:1426. [PMID: 35301315 PMCID: PMC8931002 DOI: 10.1038/s41467-022-29075-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 02/25/2022] [Indexed: 12/21/2022] Open
Abstract
Progressive degeneration of dopaminergic (DA) neurons in the substantia nigra is a hallmark of Parkinson’s disease (PD). Dysregulation of developmental transcription factors is implicated in dopaminergic neurodegeneration, but the underlying molecular mechanisms remain largely unknown. Drosophila Fer2 is a prime example of a developmental transcription factor required for the birth and maintenance of midbrain DA neurons. Using an approach combining ChIP-seq, RNA-seq, and genetic epistasis experiments with PD-linked genes, here we demonstrate that Fer2 controls a transcriptional network to maintain mitochondrial structure and function, and thus confers dopaminergic neuroprotection against genetic and oxidative insults. We further show that conditional ablation of Nato3, a mouse homolog of Fer2, in differentiated DA neurons causes mitochondrial abnormalities and locomotor impairments in aged mice. Our results reveal the essential and conserved role of Fer2 homologs in the mitochondrial maintenance of midbrain DA neurons, opening new perspectives for modeling and treating PD. Mitochondrial dysfunction in dopaminergic neurons is a pathological hallmark of Parkinson’s disease. Here, the authors find a conserved mechanism by which a single transcription factor controls mitochondrial health in dopaminergic neurons during the aging process.
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Affiliation(s)
- Federico Miozzo
- Department of Genetics and Evolution and Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, CH-1211, Geneva 4, Switzerland.,Neuroscience Institute - CNR (IN-CNR), Milan, Italy
| | - Eva P Valencia-Alarcón
- Department of Genetics and Evolution and Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, CH-1211, Geneva 4, Switzerland
| | - Luca Stickley
- Department of Genetics and Evolution and Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, CH-1211, Geneva 4, Switzerland
| | - Michaëla Majcin Dorcikova
- Department of Genetics and Evolution and Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, CH-1211, Geneva 4, Switzerland
| | | | - Damla Tas
- Department of Genetics and Evolution and Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, CH-1211, Geneva 4, Switzerland.,The Janssen Pharmaceutical Companies of Johnson & Johnson, Bern, Switzerland
| | - Nicolas Loncle
- Department of Genetics and Evolution and Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, CH-1211, Geneva 4, Switzerland.,Puma Biotechnology, Inc., Berkeley, CA, USA
| | - Irina Nikonenko
- Department of Basic Neurosciences and the Center for Neuroscience, CMU, University of Geneva, CH-1211, Geneva 4, Switzerland
| | - Peter Bou Dib
- Institute of Cell Biology, University of Bern, CH-3012, Bern, Switzerland
| | - Emi Nagoshi
- Department of Genetics and Evolution and Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, CH-1211, Geneva 4, Switzerland.
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3
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Dhakal P, Strawn M, Samal A, Behura SK. Fetal Brain Elicits Sexually Conflicting Transcriptional Response to the Ablation of Uterine Forkhead Box A2 ( Foxa2) in Mice. Int J Mol Sci 2021; 22:ijms22189693. [PMID: 34575858 PMCID: PMC8468108 DOI: 10.3390/ijms22189693] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 08/30/2021] [Accepted: 09/03/2021] [Indexed: 12/13/2022] Open
Abstract
In this study, we investigated the effects of ablation of uterine Forkhead Box A2 (Foxa2) on gene expression of fetal brain relative to placenta. Using a conditional knockout mouse model for uterine Foxa2, here we show that the lack of uterine Foxa2 elicits a sexually-conflicting transcriptional response in the fetal brain relative to placenta. The ablation of Foxa2 in the uterus altered expression of genes related to growth, nutrient sensing, aging, longevity and angiogenesis among others. In the wildtype mice, these genes were expressed higher in the fetal brain and placenta of males compared to females. However, in mice lacking uterine Foxa2, the same genes showed the opposite pattern i.e., higher expression in the fetal brain and placenta of females compared to males. Based on the known marker genes of mice placenta and fetal brain cells, we further predicted that the genes exhibiting the sexually conflicting expression were associated with vascular endothelial cells. Overall, our study suggests that uterine Foxa2 plays a role in the regulation of the brain-placental axis by influencing the fetoplacental vascular changes during pregnancy.
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Affiliation(s)
- Pramod Dhakal
- Division of Animal Sciences, University of Missouri, 920 East Campus Drive, Columbia, MO 65211, USA; (P.D.); (M.S.); (A.S.)
| | - Monica Strawn
- Division of Animal Sciences, University of Missouri, 920 East Campus Drive, Columbia, MO 65211, USA; (P.D.); (M.S.); (A.S.)
| | - Ananya Samal
- Division of Animal Sciences, University of Missouri, 920 East Campus Drive, Columbia, MO 65211, USA; (P.D.); (M.S.); (A.S.)
| | - Susanta K. Behura
- Division of Animal Sciences, University of Missouri, 920 East Campus Drive, Columbia, MO 65211, USA; (P.D.); (M.S.); (A.S.)
- MU Institute for Data Science and Informatics, University of Missouri, Columbia, MO 65211, USA
- Correspondence: ; Tel.: +1-573-882-1722
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4
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Cañizares MA, Albors AR, Singer G, Suttie N, Gorkic M, Felts P, Storey KG. Multiple steps characterise ventricular layer attrition to form the ependymal cell lining of the adult mouse spinal cord central canal. J Anat 2019; 236:334-350. [PMID: 31670387 PMCID: PMC6956438 DOI: 10.1111/joa.13094] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/03/2019] [Indexed: 12/22/2022] Open
Abstract
The ventricular layer of the spinal cord is remodelled during embryonic development and ultimately forms the ependymal cell lining of the adult central canal, which retains neural stem cell potential. This anatomical transformation involves the process of dorsal collapse; however, accompanying changes in tissue organisation and cell behaviour as well as the precise origin of cells contributing to the central canal are not well understood. Here, we describe sequential localised cell rearrangements which accompany the gradual attrition of the spinal cord ventricular layer during development. This includes local breakdown of the pseudostratified organisation of the dorsal ventricular layer prefiguring dorsal collapse and evidence for a new phenomenon, ventral dissociation, during which the ventral‐most floor plate cells separate from a subset that are retained around the central canal. Using cell proliferation markers and cell‐cycle reporter mice, we further show that following dorsal collapse, ventricular layer attrition involves an overall reduction in cell proliferation, characterised by an intriguing increase in the percentage of cells in G1/S. In contrast, programmed cell death does not contribute to ventricular layer remodelling. By analysing transcript and protein expression patterns associated with key signalling pathways, we provide evidence for a gradual decline in ventral sonic hedgehog activity and an accompanying ventral expansion of initial dorsal bone morphogenetic protein signalling, which comes to dominate the forming the central canal lining. This study identifies multiple steps that may contribute to spinal cord ventricular layer attrition and adds to increasing evidence for the heterogeneous origin of the spinal cord ependymal cell population, which includes cells from the floor plate and the roof plate as well as ventral progenitor domains.
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Affiliation(s)
- Marco A Cañizares
- Division of Cell & Developmental Biology, School of Life Sciences, University of Dundee, Dundee, UK
| | - Aida Rodrigo Albors
- Division of Cell & Developmental Biology, School of Life Sciences, University of Dundee, Dundee, UK
| | - Gail Singer
- Division of Cell & Developmental Biology, School of Life Sciences, University of Dundee, Dundee, UK
| | - Nicolle Suttie
- Division of Cell & Developmental Biology, School of Life Sciences, University of Dundee, Dundee, UK
| | - Metka Gorkic
- Division of Cell & Developmental Biology, School of Life Sciences, University of Dundee, Dundee, UK
| | - Paul Felts
- Centre for Anatomy & Human Identification, University of Dundee, Dundee, UK
| | - Kate G Storey
- Division of Cell & Developmental Biology, School of Life Sciences, University of Dundee, Dundee, UK
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5
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Peterson DJ, Marckini DN, Straight JL, King EM, Johnson W, Sarah SS, Chowdhary PK, DeLano-Taylor MK. The Basic Helix-Loop-Helix Gene Nato3 Drives Expression of Dopaminergic Neuron Transcription Factors in Neural Progenitors. Neuroscience 2019; 421:176-191. [PMID: 31672641 DOI: 10.1016/j.neuroscience.2019.09.003] [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: 01/03/2019] [Revised: 08/17/2019] [Accepted: 09/04/2019] [Indexed: 12/17/2022]
Abstract
The floor plate of the developing midbrain gives rise to dopaminergic (DA) neurons, an important class of cells involved in Parkinson's disease (PD). Neural progenitors of the midbrain floor plate utilize key genes in transcriptional networks to drive dopamine neurogenesis. Identifying factors that promote dopaminergic neuron transcriptional networks can provide insight into strategies for therapies in PD. Using the chick embryo, we developed a quantitative PCR (qPCR) based method to assess the potential of a candidate factor to drive DA neuron gene expression, including the basic helix-loop-helix transcription factor Nato3 (Ferd3l). We then showed that overexpression of Nato3 in the developing chick mesencephalon produces a regionally dependent increase in genes associated with the DA neurogenesis, (such as Foxa2, Lmx1b and Shh) as well as DA neuron genes Nurr1 (an immature DA neuron marker) and mRNA expression of tyrosine hydroxylase (TH, a mature DA neuron marker). Interestingly, our data also showed that Nato3 is a potent regulator of Lmx1b by its broad induction of Lmx1b expression in neural progenitors of multiple regions of the CNS, including the midbrain and spinal cord. These data introduce a new, in vivo approach to identifying a gene that can drive DA transcriptional networks and provide the new insight that Nato3 can drive expression of key DA neuron genes, including Lmx1b, in neural progenitors.
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Affiliation(s)
- Doug J Peterson
- Department of Biomedical Sciences, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA; Department of Cell and Molecular Biology, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA
| | - Darcy N Marckini
- Department of Cell and Molecular Biology, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA
| | - Jordan L Straight
- Department of Cell and Molecular Biology, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA
| | - Elizabeth M King
- Department of Biomedical Sciences, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA
| | - William Johnson
- Department of Cell and Molecular Biology, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA
| | - Sarala S Sarah
- Department of Biomedical Sciences, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA
| | - Puneet K Chowdhary
- Department of Biomedical Sciences, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA; Center for Neurodegenerative Science, Van Andel Research Institute, 333 Bostwick Ave., Grand Rapids MI 49506, USA
| | - Merritt K DeLano-Taylor
- Department of Biomedical Sciences, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA; Department of Cell and Molecular Biology, Grand Valley State University, 1 Campus Drive, Allendale MI 49401, USA; Center for Neurodegenerative Science, Van Andel Research Institute, 333 Bostwick Ave., Grand Rapids MI 49506, USA.
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6
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Ogura T, Sakaguchi H, Miyamoto S, Takahashi J. Three-dimensional induction of dorsal, intermediate and ventral spinal cord tissues from human pluripotent stem cells. Development 2018; 145:145/16/dev162214. [PMID: 30061169 PMCID: PMC6124545 DOI: 10.1242/dev.162214] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 07/02/2018] [Indexed: 01/09/2023]
Abstract
The spinal cord contains more than 20 distinct subclasses of neurons that form well-organized neural circuits capable of sensing the environment and generating motor behavior. Although recent studies have described the efficient in vitro generation of spinal motor neurons, the induction of the spinal cord as a whole tissue has not been achieved. In the present study, we demonstrate three-dimensional (3D) induction of dorsal spinal cord-like tissues from human pluripotent stem cells. Our 3D spinal cord induction (3-DiSC) condition recapitulates patterning of the developing dorsal spinal cord and enables the generation of four types of dorsal interneuron marker-positive cell populations. By activating Shh signaling, intermediate and ventral spinal cord-like tissues are successfully induced. After dissociation of these tissues, somatosensory neurons and spinal motor neurons are detected and express neurotransmitters in an in vivo manner. Our approach provides a useful experimental tool for the analysis of human spinal cord development and will contribute to research on the formation and organization of the spinal cord, and its application to regenerative medicine.
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Affiliation(s)
- Takenori Ogura
- Department of Clinical Application, Center for iPS Cell Research and Application, Kyoto University, 606-8507 Kyoto, Japan.,Department of Neurosurgery, Kyoto University Graduate School of Medicine, 606-8507 Kyoto, Japan
| | - Hideya Sakaguchi
- Department of Clinical Application, Center for iPS Cell Research and Application, Kyoto University, 606-8507 Kyoto, Japan
| | - Susumu Miyamoto
- Department of Neurosurgery, Kyoto University Graduate School of Medicine, 606-8507 Kyoto, Japan
| | - Jun Takahashi
- Department of Clinical Application, Center for iPS Cell Research and Application, Kyoto University, 606-8507 Kyoto, Japan .,Department of Neurosurgery, Kyoto University Graduate School of Medicine, 606-8507 Kyoto, Japan
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7
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Mansour AA, Gonçalves JT, Bloyd CW, Li H, Fernandes S, Quang D, Johnston S, Parylak SL, Jin X, Gage FH. An in vivo model of functional and vascularized human brain organoids. Nat Biotechnol 2018; 36:432-441. [PMID: 29658944 DOI: 10.1038/nbt.4127] [Citation(s) in RCA: 703] [Impact Index Per Article: 117.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 03/23/2018] [Indexed: 02/06/2023]
Abstract
Differentiation of human pluripotent stem cells to small brain-like structures known as brain organoids offers an unprecedented opportunity to model human brain development and disease. To provide a vascularized and functional in vivo model of brain organoids, we established a method for transplanting human brain organoids into the adult mouse brain. Organoid grafts showed progressive neuronal differentiation and maturation, gliogenesis, integration of microglia, and growth of axons to multiple regions of the host brain. In vivo two-photon imaging demonstrated functional neuronal networks and blood vessels in the grafts. Finally, in vivo extracellular recording combined with optogenetics revealed intragraft neuronal activity and suggested graft-to-host functional synaptic connectivity. This combination of human neural organoids and an in vivo physiological environment in the animal brain may facilitate disease modeling under physiological conditions.
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Affiliation(s)
- Abed AlFatah Mansour
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA
| | - J Tiago Gonçalves
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA
| | - Cooper W Bloyd
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA
| | - Hao Li
- Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, California, USA
| | - Sarah Fernandes
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA.,Department of Biology, San Diego State University, San Diego, California, USA
| | - Daphne Quang
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA
| | - Stephen Johnston
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA
| | - Sarah L Parylak
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA
| | - Xin Jin
- Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, California, USA
| | - Fred H Gage
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA
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8
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Qin W, Chen S, Yang S, Xu Q, Xu C, Cai J. The Effect of Traditional Chinese Medicine on Neural Stem Cell Proliferation and Differentiation. Aging Dis 2017; 8:792-811. [PMID: 29344417 PMCID: PMC5758352 DOI: 10.14336/ad.2017.0428] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 04/28/2017] [Indexed: 12/12/2022] Open
Abstract
Neural stem cells (NSCs) are special types of cells with the potential for self-renewal and multi-directional differentiation. NSCs are regulated by multiple pathways and pathway related transcription factors during the process of proliferation and differentiation. Numerous studies have shown that the compound medicinal preparations, single herbs, and herb extracts in traditional Chinese medicine (TCM) have specific roles in regulating the proliferation and differentiation of NSCs. In this study, we investigate the markers of NSCs in various stages of differentiation, the related pathways regulating the proliferation and differentiation, and the corresponding transcription factors in the pathways. We also review the influence of TCM on NSC proliferation and differentiation, to facilitate the development of TCM in neural regeneration and neurodegenerative diseases.
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Affiliation(s)
- Wei Qin
- 1Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, China
| | - Shiya Chen
- 1Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, China
| | - Shasha Yang
- 1Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, China
| | - Qian Xu
- 2College of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, China
| | - Chuanshan Xu
- 3School of Chinese Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Jing Cai
- 2College of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou 350122, China
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9
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Danesin C, Soula C. Moving the Shh Source over Time: What Impact on Neural Cell Diversification in the Developing Spinal Cord? J Dev Biol 2017; 5:jdb5020004. [PMID: 29615562 PMCID: PMC5831764 DOI: 10.3390/jdb5020004] [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: 02/28/2017] [Revised: 03/29/2017] [Accepted: 04/06/2017] [Indexed: 12/18/2022] Open
Abstract
A substantial amount of data has highlighted the crucial influence of Shh signalling on the generation of diverse classes of neurons and glial cells throughout the developing central nervous system. A critical step leading to this diversity is the establishment of distinct neural progenitor cell domains during the process of pattern formation. The forming spinal cord, in particular, has served as an excellent model to unravel how progenitor cells respond to Shh to produce the appropriate pattern. In recent years, considerable advances have been made in our understanding of important parameters that control the temporal and spatial interpretation of the morphogen signal at the level of Shh-receiving progenitor cells. Although less studied, the identity and position of Shh source cells also undergo significant changes over time, raising the question of how moving the Shh source contributes to cell diversification in response to the morphogen. Here, we focus on the dynamics of Shh-producing cells and discuss specific roles for these time-variant Shh sources with regard to the temporal events occurring in the receiving field.
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Affiliation(s)
- Cathy Danesin
- Centre de Biologie du Développement (CBD) CNRS/UPS, Centre de Biologie Intégrative (CBI), Université de Toulouse, 31520 Toulouse, France.
| | - Cathy Soula
- Centre de Biologie du Développement (CBD) CNRS/UPS, Centre de Biologie Intégrative (CBI), Université de Toulouse, 31520 Toulouse, France.
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10
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Kutejova E, Sasai N, Shah A, Gouti M, Briscoe J. Neural Progenitors Adopt Specific Identities by Directly Repressing All Alternative Progenitor Transcriptional Programs. Dev Cell 2016; 36:639-53. [PMID: 26972603 PMCID: PMC4819439 DOI: 10.1016/j.devcel.2016.02.013] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 12/29/2015] [Accepted: 02/12/2016] [Indexed: 01/01/2023]
Abstract
In the vertebrate neural tube, a morphogen-induced transcriptional network produces multiple molecularly distinct progenitor domains, each generating different neuronal subtypes. Using an in vitro differentiation system, we defined gene expression signatures of distinct progenitor populations and identified direct gene-regulatory inputs corresponding to locations of specific transcription factor binding. Combined with targeted perturbations of the network, this revealed a mechanism in which a progenitor identity is installed by active repression of the entire transcriptional programs of other neural progenitor fates. In the ventral neural tube, sonic hedgehog (Shh) signaling, together with broadly expressed transcriptional activators, concurrently activates the gene expression programs of several domains. The specific outcome is selected by repressive input provided by Shh-induced transcription factors that act as the key nodes in the network, enabling progenitors to adopt a single definitive identity from several initially permitted options. Together, the data suggest design principles relevant to many developing tissues. Specific vertebrate neural progenitor populations generated in vitro Gene expression dynamics, transcription factor binding assessed in neural progenitors Progenitor fate selected by repressors blocking entire programs of other identities Repressors counteract non-selective morphogen and pan-neural activatory inputs
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Affiliation(s)
- Eva Kutejova
- The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London NW7 1AA, UK
| | - Noriaki Sasai
- The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London NW7 1AA, UK
| | - Ankita Shah
- The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London NW7 1AA, UK
| | - Mina Gouti
- The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London NW7 1AA, UK
| | - James Briscoe
- The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London NW7 1AA, UK.
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