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Elziny S, Sran S, Yoon H, Corrigan RR, Page J, Ringland A, Lanier A, Lapidus S, Foreman J, Heinzen EL, Iffland P, Crino PB, Bedrosian TA. Loss of Slc35a2 alters development of the mouse cerebral cortex. Neurosci Lett 2024; 836:137881. [PMID: 38909838 DOI: 10.1016/j.neulet.2024.137881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 06/17/2024] [Accepted: 06/19/2024] [Indexed: 06/25/2024]
Abstract
Brain somatic variants in SLC35A2, an intracellular UDP-galactose transporter, are commonly identified mutations associated with drug-resistant neocortical epilepsy and developmental brain malformations, including focal cortical dysplasia type I and mild malformation of cortical development with oligodendroglial hyperplasia in epilepsy (MOGHE). However, the causal effects of altered SLC35A2 function on cortical development remain untested. We hypothesized that focal Slc35a2 knockout (KO) or knockdown (KD) in the developing mouse cortex would disrupt cortical development and change network excitability. Through two independent studies, we used in utero electroporation (IUE) to introduce CRISPR/Cas9/targeted guide RNAs or short-hairpin RNAs into the embryonic mouse brain at day 14.5-15.5 to achieve Slc35a2 KO or KD, respectively, from neural precursor cells. Slc35a2 KO or KD caused disrupted radial migration of electroporated neurons evidenced by heterotopic cells located in lower cortical layers and in the sub-cortical white matter. Slc35a2 KO in neurons did not induce changes in oligodendrocyte number, importantly suggesting that the oligodendroglial hyperplasia observed in MOGHE originates from distinct cell autonomous effects of Slc35a2 mutations. Adult KO mice were implanted with EEG electrodes for 72-hour continuous recording. Spontaneous seizures were not observed in focal Slc35a2 KO mice, but there was reduced seizure threshold following pentylenetetrazol injection. Here we demonstrate that focal Slc35a2 KO or KD in vivo disrupts corticogenesis through altered neuronal migration and that KO leads to reduced seizure threshold. Together these results demonstrate a direct causal role for SLC35A2 in cortical development.
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Affiliation(s)
- Soad Elziny
- Dept. of Neurology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Sahibjot Sran
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, OH, United States
| | - Hyojung Yoon
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, OH, United States
| | - Rachel R Corrigan
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, OH, United States
| | - John Page
- Dept. of Neurology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Amanda Ringland
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, OH, United States
| | - Anna Lanier
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, OH, United States
| | - Sara Lapidus
- Dept. of Neurology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - James Foreman
- Dept. of Neurology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Erin L Heinzen
- Division of Pharmacotherapy and Experimental Therapeutics, Eshelman School of Pharmacy and Department of Genetics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Philip Iffland
- Dept. of Neurology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Peter B Crino
- Dept. of Neurology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Tracy A Bedrosian
- Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, OH, United States; Dept. of Pediatrics, The Ohio State University College of Medicine, Columbus, OH, United States.
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2
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Elziny S, Sran S, Yoon H, Corrigan RR, Page J, Ringland A, Lanier A, Lapidus S, Foreman J, Heinzen EL, Iffland P, Crino PB, Bedrosian TA. Loss of Slc35a2 alters development of the mouse cerebral cortex. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.11.29.569243. [PMID: 38077069 PMCID: PMC10705455 DOI: 10.1101/2023.11.29.569243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Brain somatic variants in SLC35A2 are associated with clinically drug-resistant epilepsy and developmental brain malformations, including mild malformation of cortical development with oligodendroglial hyperplasia in epilepsy (MOGHE). SLC35A2 encodes a uridine diphosphate galactose translocator that is essential for protein glycosylation; however, the neurodevelopmental mechanisms by which SLC35A2 disruption leads to clinical and histopathological features remain unspecified. We hypothesized that focal knockout (KO) or knockdown (KD) of Slc35a2 in the developing mouse cortex would disrupt cerebral cortical development through altered neuronal migration and cause changes in network excitability. We used in utero electroporation (IUE) to introduce CRISPR/Cas9 and targeted guide RNAs or short-hairpin RNAs to achieve Slc35a2 KO or KD, respectively, during early corticogenesis. Following Slc35a2 KO or KD, we observed disrupted radial migration of transfected neurons evidenced by heterotopic cells located in lower cortical layers and in the sub-cortical white matter. Slc35a2 KO in neurons did not induce changes in oligodendrocyte number, suggesting that the oligodendroglial hyperplasia observed in MOGHE originates from distinct cell autonomous effects. Spontaneous seizures were not observed, but intracranial EEG recordings after focal KO showed a reduced seizure threshold following pentylenetetrazol injection. These results demonstrate that Slc35a2 KO or KD in vivo disrupts corticogenesis through altered neuronal migration.
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Affiliation(s)
- Soad Elziny
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Sahibjot Sran
- Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH, USA
| | - Hyojung Yoon
- Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH, USA
| | - Rachel R. Corrigan
- Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH, USA
| | - John Page
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Amanda Ringland
- Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH, USA
| | - Anna Lanier
- Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH, USA
| | - Sara Lapidus
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - James Foreman
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Erin L. Heinzen
- Division of Pharmacotherapy and Experimental Therapeutics, Eshelman School of Pharmacy and Department of Genetics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Philip Iffland
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Peter B. Crino
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Tracy A. Bedrosian
- Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH, USA
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH, USA
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3
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Morrison HM, Craft J, Rivera-Lugo R, Johnson JR, Golovkine GR, Bell SL, Dodd CE, Van Dis E, Beatty WL, Margolis SR, Repasy T, Shaker I, Lee AY, Vance RE, Stanley SA, Watson RO, Krogan NJ, Portnoy DA, Penn BH, Cox JS. Deficiency in Galectin-3, -8, and -9 impairs immunity to chronic Mycobacterium tuberculosis infection but not acute infection with multiple intracellular pathogens. PLoS Pathog 2023; 19:e1011088. [PMID: 37352334 PMCID: PMC10325092 DOI: 10.1371/journal.ppat.1011088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 07/06/2023] [Accepted: 05/01/2023] [Indexed: 06/25/2023] Open
Abstract
Macrophages employ an array of pattern recognition receptors to detect and eliminate intracellular pathogens that access the cytosol. The cytosolic carbohydrate sensors Galectin-3, -8, and -9 (Gal-3, Gal-8, and Gal-9) recognize damaged pathogen-containing phagosomes, and Gal-3 and Gal-8 are reported to restrict bacterial growth via autophagy in cultured cells. However, the contribution of these galectins to host resistance during bacterial infection in vivo remains unclear. We found that Gal-9 binds directly to Mycobacterium tuberculosis (Mtb) and Salmonella enterica serovar Typhimurium (Stm) and localizes to Mtb in macrophages. To determine the combined contribution of membrane damage-sensing galectins to immunity, we generated Gal-3, -8, and -9 triple knockout (TKO) mice. Mtb infection of primary macrophages from TKO mice resulted in defective autophagic flux but normal bacterial replication. Surprisingly, these mice had no discernable defect in resistance to acute infection with Mtb, Stm or Listeria monocytogenes, and had only modest impairments in bacterial growth restriction and CD4 T cell activation during chronic Mtb infection. Collectively, these findings indicate that while Gal-3, -8, and -9 respond to an array of intracellular pathogens, together these membrane damage-sensing galectins play a limited role in host resistance to bacterial infection.
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Affiliation(s)
- Huntly M. Morrison
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
| | - Julia Craft
- Department of Internal Medicine, Division of Infectious Diseases, University of California, Davis, Davis, California, United States of America
| | - Rafael Rivera-Lugo
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
| | - Jeffery R. Johnson
- Department of Cellular and Molecular Pharmacology, University of California, San Francisco; Quantitative Biosciences Institute (QBI), University of California, San Francisco; Gladstone Institutes, San Francisco, California, United States of America
| | - Guillaume R. Golovkine
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
| | - Samantha L. Bell
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health, School of Medicine, Bryan, Texas, United States of America
| | - Claire E. Dodd
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
| | - Erik Van Dis
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
| | - Wandy L. Beatty
- Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Shally R. Margolis
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
| | - Teresa Repasy
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
| | - Isaac Shaker
- Department of Internal Medicine, Division of Infectious Diseases, University of California, Davis, Davis, California, United States of America
| | - Angus Y. Lee
- Cancer Research Laboratory, University of California, Berkeley, Berkeley, California, United States of America
| | - Russell E. Vance
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
- Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, California, United States of America
| | - Sarah A. Stanley
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
- School of Public Health, Division of Infectious Diseases and Vaccinology, University of California, Berkeley, Berkeley, California, United States of America
| | - Robert O. Watson
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health, School of Medicine, Bryan, Texas, United States of America
| | - Nevan J. Krogan
- Department of Cellular and Molecular Pharmacology, University of California, San Francisco; Quantitative Biosciences Institute (QBI), University of California, San Francisco; Gladstone Institutes, San Francisco, California, United States of America
| | - Daniel A. Portnoy
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
| | - Bennett H. Penn
- Department of Internal Medicine, Division of Infectious Diseases, University of California, Davis, Davis, California, United States of America
| | - Jeffery S. Cox
- Department of Molecular and Cell Biology, Division of Immunology and Molecular Medicine, University of California, Berkeley, Berkeley, California, United States of America
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4
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Espinosa-Medina I, Feliciano D, Belmonte-Mateos C, Linda Miyares R, Garcia-Marques J, Foster B, Lindo S, Pujades C, Koyama M, Lee T. TEMPO enables sequential genetic labeling and manipulation of vertebrate cell lineages. Neuron 2023; 111:345-361.e10. [PMID: 36417906 DOI: 10.1016/j.neuron.2022.10.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 08/15/2022] [Accepted: 10/26/2022] [Indexed: 11/24/2022]
Abstract
During development, regulatory factors appear in a precise order to determine cell fates over time. Consequently, to investigate complex tissue development, it is necessary to visualize and manipulate cell lineages with temporal control. Current strategies for tracing vertebrate cell lineages lack genetic access to sequentially produced cells. Here, we present TEMPO (Temporal Encoding and Manipulation in a Predefined Order), an imaging-readable genetic tool allowing differential labeling and manipulation of consecutive cell generations in vertebrates. TEMPO is based on CRISPR and powered by a cascade of gRNAs that drive orderly activation and inactivation of reporters and/or effectors. Using TEMPO to visualize zebrafish and mouse neurogenesis, we recapitulated birth-order-dependent neuronal fates. Temporally manipulating cell-cycle regulators in mouse cortex progenitors altered the proportion and distribution of neurons and glia, revealing the effects of temporal gene perturbation on serial cell fates. Thus, TEMPO enables sequential manipulation of molecular factors, crucial to study cell-type specification.
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Affiliation(s)
| | - Daniel Feliciano
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA
| | - Carla Belmonte-Mateos
- Department of Experimental and Health Sciences, Universitat Pompeu Fabra, PRBB, Barcelona 08003, Spain
| | - Rosa Linda Miyares
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA
| | - Jorge Garcia-Marques
- Centro Nacional de Biotecnologia, Consejo Superior de Investigaciones Cientificas, Madrid 28049, Spain
| | - Benjamin Foster
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA
| | - Sarah Lindo
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA
| | - Cristina Pujades
- Department of Experimental and Health Sciences, Universitat Pompeu Fabra, PRBB, Barcelona 08003, Spain
| | - Minoru Koyama
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA; Department of Biological Sciences, University of Toronto Scarborough, Toronto, ON M1C 1A4, Canada
| | - Tzumin Lee
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA.
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5
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Xu H, Gao K, Liu Q, Wang T, Zhang Z, Cai L, Wu Y, Jiang Y. Brain Somatic Variant in Ras-Like Small GTPase RALA Causes Focal Cortical Dysplasia Type II. Front Behav Neurosci 2022; 16:919485. [PMID: 35846790 PMCID: PMC9280360 DOI: 10.3389/fnbeh.2022.919485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 06/03/2022] [Indexed: 11/24/2022] Open
Abstract
Purpose In our group’s previous study, we performed deep whole-exome sequencing and targeted amplicon sequencing in the postoperative brain tissue of epilepsy patients with focal cortical dysplasia type II (FCD II). We identified the first somatic variant of RALA in the brain tissue of a child with FCD type IIb. RALA encodes a small GTPase of the Ras superfamily. To date, the role of RALA in brain development is not yet known. In this study, we reported that the RALA somatic variant led to FCD type II through activation of the mammalian target of rapamycin (mTOR) pathways. Materials and Methods HEK293T cells were transfected in vitro to analyze the expression of the RalA protein, as well as phosphorylated S6 (P-S6), one of the major markers of mTOR pathway activation, RalA GTPase activity, and the interaction between RalA and its downstream binding effectors. In vivo, wild-type, and mutant RALA plasmids were transfected into the local cortex of mice using in utero electroporation to evaluate the effect of RALA c.G482A on neuronal migration. Results The RALA c.G482A mutation increased RalA protein expression, the abnormal activation of the mTOR pathways, RalA GTPase activity, and binding to downstream effectors. RALA c.G482A local transfection in the embryonic brain in utero induced abnormal cortical neuron migration in mice. Conclusion This study demonstrated for the first time that the somatic gain-of-function variant of RALA activates the mTOR pathway and leads to neuronal migration disorders in the brain, facilitating the development of FCD II. Therefore, RALA brain somatic mutation may be one of the pathogenic mechanisms leading to FCD II, which is always related to drug-resistant epilepsy in children. However, more somatic variations of this gene are required to be confirmed in more FCD II patient brain samples.
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Affiliation(s)
- Han Xu
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Kai Gao
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Qingzhu Liu
- Children Epilepsy Center, Peking University First Hospital, Beijing, China
| | - Tianshuang Wang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Zhongbin Zhang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
| | - Lixin Cai
- Children Epilepsy Center, Peking University First Hospital, Beijing, China
| | - Ye Wu
- Department of Pediatrics, Peking University First Hospital, Beijing, China
- Children Epilepsy Center, Peking University First Hospital, Beijing, China
- *Correspondence: Ye Wu,
| | - Yuwu Jiang
- Department of Pediatrics, Peking University First Hospital, Beijing, China
- Children Epilepsy Center, Peking University First Hospital, Beijing, China
- Beijing Key Laboratory of Molecular Diagnosis and Study on Pediatric Genetic Diseases, Beijing, China
- Key Laboratory for Neuroscience, Ministry of Education/National Health and Family Planning Commission, Peking University, Beijing, China
- Institute for Brain Disorders, Beijing, China
- Yuwu Jiang, ,
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6
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Andersen RE, Hong SJ, Lim JJ, Cui M, Harpur BA, Hwang E, Delgado RN, Ramos AD, Liu SJ, Blencowe BJ, Lim DA. The Long Noncoding RNA Pnky Is a Trans-acting Regulator of Cortical Development In Vivo. Dev Cell 2020; 49:632-642.e7. [PMID: 31112699 DOI: 10.1016/j.devcel.2019.04.032] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 02/15/2019] [Accepted: 04/18/2019] [Indexed: 02/06/2023]
Abstract
While it is now appreciated that certain long noncoding RNAs (lncRNAs) have important functions in cell biology, relatively few have been shown to regulate development in vivo, particularly with genetic strategies that establish cis versus trans mechanisms. Pnky is a nuclear-enriched lncRNA that is transcribed divergently from the neighboring proneural transcription factor Pou3f2. Here, we show that conditional deletion of Pnky from the developing cortex regulates the production of projection neurons from neural stem cells (NSCs) in a cell-autonomous manner, altering postnatal cortical lamination. Surprisingly, Pou3f2 expression is not disrupted by deletion of the entire Pnky gene. Moreover, expression of Pnky from a BAC transgene rescues the differential gene expression and increased neurogenesis of Pnky-knockout NSCs, as well as the developmental phenotypes of Pnky-deletion in vivo. Thus, despite being transcribed divergently from a key developmental transcription factor, the lncRNA Pnky regulates development in trans.
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Affiliation(s)
- Rebecca E Andersen
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA; Developmental and Stem Cell Biology Graduate Program, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Sung Jun Hong
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA; Developmental and Stem Cell Biology Graduate Program, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Justin J Lim
- Donnelly Centre and Department of Molecular Genetics, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada
| | - Miao Cui
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Brock A Harpur
- Donnelly Centre and Department of Molecular Genetics, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada
| | - Elizabeth Hwang
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA; Medical Scientist Training Program, Biomedical Sciences Graduate Program, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Ryan N Delgado
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA; Medical Scientist Training Program, Biomedical Sciences Graduate Program, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Alexander D Ramos
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA; Medical Scientist Training Program, Biomedical Sciences Graduate Program, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Siyuan John Liu
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA; Medical Scientist Training Program, Biomedical Sciences Graduate Program, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Benjamin J Blencowe
- Donnelly Centre and Department of Molecular Genetics, University of Toronto, 160 College Street, Toronto, ON M5S 3E1, Canada
| | - Daniel A Lim
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA; Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA; San Francisco Veterans Affairs Medical Center, San Francisco, CA 94121, USA.
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7
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Tang FL, Zhao L, Zhao Y, Sun D, Zhu XJ, Mei L, Xiong WC. Coupling of terminal differentiation deficit with neurodegenerative pathology in Vps35-deficient pyramidal neurons. Cell Death Differ 2020; 27:2099-2116. [PMID: 31907392 PMCID: PMC7308361 DOI: 10.1038/s41418-019-0487-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 12/13/2019] [Accepted: 12/17/2019] [Indexed: 12/11/2022] Open
Abstract
Vps35 (vacuolar protein sorting 35) is a key component of retromer that regulates transmembrane protein trafficking. Dysfunctional Vps35 is a risk factor for neurodegenerative diseases, including Parkinson’s and Alzheimer’s diseases. Vps35 is highly expressed in developing pyramidal neurons, and its physiological role in developing neurons remains to be explored. Here, we provide evidence that Vps35 in embryonic neurons is necessary for axonal and dendritic terminal differentiation. Loss of Vps35 in embryonic neurons results in not only terminal differentiation deficits, but also neurodegenerative pathology, such as cortical brain atrophy and reactive glial responses. The atrophy of neocortex appears to be in association with increases in neuronal death, autophagosome proteins (LC3-II and P62), and neurodegeneration associated proteins (TDP43 and ubiquitin-conjugated proteins). Further studies reveal an increase of retromer cargo protein, sortilin1 (Sort1), in lysosomes of Vps35-KO neurons, and lysosomal dysfunction. Suppression of Sort1 diminishes Vps35-KO-induced dendritic defects. Expression of lysosomal Sort1 recapitulates Vps35-KO-induced phenotypes. Together, these results demonstrate embryonic neuronal Vps35’s function in terminal axonal and dendritic differentiation, reveal an association of terminal differentiation deficit with neurodegenerative pathology, and uncover an important lysosomal contribution to both events.
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Affiliation(s)
- Fu-Lei Tang
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, 30912, Georgia
| | - Lu Zhao
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, 30912, Georgia.,Department of Neurosciences, Case Western Reserve University, School of Medicine, Cleveland, OH, 44106, USA.,Key Laboratory of Molecular Epigenetics of Ministry of Education, Institute of Cytology and Genetics, Northeast Normal University, Changchun, Jilin, 130024, China
| | - Yang Zhao
- Department of Neurosciences, Case Western Reserve University, School of Medicine, Cleveland, OH, 44106, USA.,Key Laboratory of Molecular Epigenetics of Ministry of Education, Institute of Cytology and Genetics, Northeast Normal University, Changchun, Jilin, 130024, China
| | - Dong Sun
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, 30912, Georgia.,Department of Neurosciences, Case Western Reserve University, School of Medicine, Cleveland, OH, 44106, USA
| | - Xiao-Juan Zhu
- Key Laboratory of Molecular Epigenetics of Ministry of Education, Institute of Cytology and Genetics, Northeast Normal University, Changchun, Jilin, 130024, China
| | - Lin Mei
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, 30912, Georgia.,Department of Neurosciences, Case Western Reserve University, School of Medicine, Cleveland, OH, 44106, USA
| | - Wen-Cheng Xiong
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, 30912, Georgia. .,Department of Neurosciences, Case Western Reserve University, School of Medicine, Cleveland, OH, 44106, USA.
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8
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Kannan M, Vasan G, Pieribone VA. Optimizing Strategies for Developing Genetically Encoded Voltage Indicators. Front Cell Neurosci 2019; 13:53. [PMID: 30863283 PMCID: PMC6399427 DOI: 10.3389/fncel.2019.00053] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 02/04/2019] [Indexed: 01/23/2023] Open
Abstract
Genetically encoded optical indicators of neuronal activity enable unambiguous recordings of input-output activity patterns from identified cells in intact circuits. Among them, genetically encoded voltage indicators (GEVIs) offer additional advantages over calcium indicators as they are direct sensors of membrane potential and can adeptly report subthreshold events and hyperpolarization. Here, we outline the major GEVI designs and give an account of properties that need to be carefully optimized during indicator engineering. While designing the ideal GEVI, one should keep in mind aspects such as membrane localization, signal size, signal-to-noise ratio, kinetics and voltage dependence of optical responses. Using ArcLight and derivatives as prototypes, we delineate how a probe should be optimized for the former properties and developed along other areas in a need-based manner. Finally, we present an overview of the GEVI engineering process and lend an insight into their discovery, delivery and diagnosis.
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Affiliation(s)
- Madhuvanthi Kannan
- The John B. Pierce Laboratory, New Haven, CT, United States.,Department of Cellular and Molecular Physiology, Yale School of Medicine, Yale University, New Haven, CT, United States
| | - Ganesh Vasan
- The John B. Pierce Laboratory, New Haven, CT, United States.,Department of Cellular and Molecular Physiology, Yale School of Medicine, Yale University, New Haven, CT, United States
| | - Vincent A Pieribone
- The John B. Pierce Laboratory, New Haven, CT, United States.,Department of Cellular and Molecular Physiology, Yale School of Medicine, Yale University, New Haven, CT, United States.,Department of Neuroscience, Yale School of Medicine, Yale University, New Haven, CT, United States
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9
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Yamaguchi A, Woller DJ, Rodrigues P. Development of an Acute Method to Deliver Transgenes Into the Brains of Adult Xenopus laevis. Front Neural Circuits 2018; 12:92. [PMID: 30416430 PMCID: PMC6213920 DOI: 10.3389/fncir.2018.00092] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 10/03/2018] [Indexed: 01/06/2023] Open
Abstract
The central vocal pathway of the African clawed frog, Xenopus laevis, is a powerful vertebrate model to understand mechanisms underlying central pattern generation. However, fast and efficient methods of introducing exogenous genes into the neurons of adult X. laevis are currently not available. Here, we systematically tested methods of transgene delivery into adult X. laevis neurons. Although successfully used for tadpole neurons for over a decade, electroporation was not efficient in transfecting adult neurons. Similarly, adeno-associated virus (AAV) was not reliable, and lentivirus (LV) failed to function as viral vector in adult Xenopus neurons. In contrast, vesicular stomatitis virus (VSV) was a fast and robust vector for adult X. laevis neurons. Although toxic to the host cells, VSV appears to be less virulent to frog neurons than they are to mice neurons. At a single cell level, infected neurons showed normal physiological properties up to 7 days post infection and vocal circuits that included infected neurons generated normal fictive vocalizations up to 9 days post infection. The relatively long time window during which the physiology of VSV-infected neurons can be studied presents an ideal condition for the use of optogenetic tools. We showed that VSV does not gain entry into myelinated axons, but is taken up by both the soma and axon terminal; this is an attractive feature that drives transgene expression in projection neurons. Previous studies showed that VSVs can spread across synapses in anterograde or retrograde directions depending on the types of glycoprotein that are encoded. However, rVSV did not spread across synapses in the Xenopus central nervous system. The successful use of VSV as a transgene vector in amphibian brains not only allows us to exploit the full potential of the genetic tools to answer questions central to understanding central pattern generation, but also opens the door to other research programs that focus on non-genetic model organisms to address unique questions.
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Affiliation(s)
- Ayako Yamaguchi
- Department of Biology, University of Utah, Salt Lake City, UT, United States
| | - Diana J Woller
- Department of Biology, University of Utah, Salt Lake City, UT, United States
| | - Paulo Rodrigues
- Department of Biology, University of Utah, Salt Lake City, UT, United States
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Ricard C, Arroyo ED, He CX, Portera-Cailliau C, Lepousez G, Canepari M, Fiole D. Two-photon probes for in vivo multicolor microscopy of the structure and signals of brain cells. Brain Struct Funct 2018; 223:3011-3043. [PMID: 29748872 PMCID: PMC6119111 DOI: 10.1007/s00429-018-1678-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 05/03/2018] [Indexed: 02/07/2023]
Abstract
Imaging the brain of living laboratory animals at a microscopic scale can be achieved by two-photon microscopy thanks to the high penetrability and low phototoxicity of the excitation wavelengths used. However, knowledge of the two-photon spectral properties of the myriad fluorescent probes is generally scarce and, for many, non-existent. In addition, the use of different measurement units in published reports further hinders the design of a comprehensive imaging experiment. In this review, we compile and homogenize the two-photon spectral properties of 280 fluorescent probes. We provide practical data, including the wavelengths for optimal two-photon excitation, the peak values of two-photon action cross section or molecular brightness, and the emission ranges. Beyond the spectroscopic description of these fluorophores, we discuss their binding to biological targets. This specificity allows in vivo imaging of cells, their processes, and even organelles and other subcellular structures in the brain. In addition to probes that monitor endogenous cell metabolism, studies of healthy and diseased brain benefit from the specific binding of certain probes to pathology-specific features, ranging from amyloid-β plaques to the autofluorescence of certain antibiotics. A special focus is placed on functional in vivo imaging using two-photon probes that sense specific ions or membrane potential, and that may be combined with optogenetic actuators. Being closely linked to their use, we examine the different routes of intravital delivery of these fluorescent probes according to the target. Finally, we discuss different approaches, strategies, and prerequisites for two-photon multicolor experiments in the brains of living laboratory animals.
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Affiliation(s)
- Clément Ricard
- Brain Physiology Laboratory, CNRS UMR 8118, 75006, Paris, France
- Faculté de Sciences Fondamentales et Biomédicales, Université Paris Descartes, PRES Sorbonne Paris Cité, 75006, Paris, France
- Fédération de Recherche en Neurosciences FR 3636, Paris, 75006, France
| | - Erica D Arroyo
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Cynthia X He
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Carlos Portera-Cailliau
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, USA
- Department of Neurobiology, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Gabriel Lepousez
- Unité Perception et Mémoire, Département de Neuroscience, Institut Pasteur, 25 rue du Docteur Roux, 75724, Paris Cedex 15, France
| | - Marco Canepari
- Laboratory for Interdisciplinary Physics, UMR 5588 CNRS and Université Grenoble Alpes, 38402, Saint Martin d'Hères, France
- Laboratories of Excellence, Ion Channel Science and Therapeutics, Grenoble, France
- Institut National de la Santé et Recherche Médicale (INSERM), Grenoble, France
| | - Daniel Fiole
- Unité Biothérapies anti-Infectieuses et Immunité, Département des Maladies Infectieuses, Institut de Recherche Biomédicale des Armées, BP 73, 91223, Brétigny-sur-Orge cedex, France.
- Human Histopathology and Animal Models, Infection and Epidemiology Department, Institut Pasteur, 28 rue du docteur Roux, 75725, Paris Cedex 15, France.
- ESRF-The European Synchrotron, 38043, Grenoble cedex, France.
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Szczurkowska J, Cwetsch AW, dal Maschio M, Ghezzi D, Ratto GM, Cancedda L. Targeted in vivo genetic manipulation of the mouse or rat brain by in utero electroporation with a triple-electrode probe. Nat Protoc 2016; 11:399-412. [DOI: 10.1038/nprot.2016.014] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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