1
|
Saito M, Atsumi GI. [Mechanisms of bone formation by primary cilia]. Nihon Yakurigaku Zasshi 2024:23113. [PMID: 38684398 DOI: 10.1254/fpj.23113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Primary cilia are immotile cilia assembled from the centriole-derived basal body, and they protrude on the cell surface in almost all cell types during the cell cycle G0 phase. Due to the diffusion barrier at the ciliary base, cilia harbor selective G protein-coupled receptors, growth factor receptors, and ion channels on their membrane. Thus, cilia act as sensory organelles, regulating the proliferation and differentiation of the cells and promoting the formation and maturation of various organs including bone, brain, and kidney. It has been unveiled that malformation and dysregulation of cilia cause organ dysplasia, so-called ciliopathy, thus research on primary cilia has become active during the past 20 years. Research on the roles of cilia in bone formation and its regulatory mechanisms have also progressed. It is widely recognized that cilia of preosteoblasts receive hedgehog and promote differentiation of the cells to osteoblasts, resulting in the formation of skulls and long bones. Recently, it has been shown that a membrane-associated protein 4.1G is important in ciliogenesis, hedgehog signaling, and osteoblast differentiation in neonatal bone formation. In this review, we would like to summarize the roles of primary cilia in bone formation and their regulatory mechanisms including the contribution of 4.1G.
Collapse
Affiliation(s)
- Masaki Saito
- Department of Molecular Physiology and Pathology, Faculty of Pharmaceutical Sciences, Teikyo University
| | - Gen-Ichi Atsumi
- Department of Molecular Physiology and Pathology, Faculty of Pharmaceutical Sciences, Teikyo University
| |
Collapse
|
2
|
Fitzsimons LA, Tasouri E, Willaredt MA, Stetson D, Gojak C, Kirsch J, Gardner HAR, Gorgas K, Tucker KL. Primary cilia are critical for tracheoesophageal septation. Dev Dyn 2024; 253:312-332. [PMID: 37776236 PMCID: PMC10922539 DOI: 10.1002/dvdy.660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 08/14/2023] [Accepted: 09/09/2023] [Indexed: 10/02/2023] Open
Abstract
INTRODUCTION Primary cilia play pivotal roles in the patterning and morphogenesis of a wide variety of organs during mammalian development. Here we examined murine foregut septation in the cobblestone mutant, a hypomorphic allele of the gene encoding the intraflagellar transport protein IFT88, a protein essential for normal cilia function. RESULTS We reveal a crucial role for primary cilia in foregut division, since their dramatic decrease in cilia in both the foregut endoderm and mesenchyme of mutant embryos resulted in a proximal tracheoesophageal septation defects and in the formation of distal tracheo(broncho)esophageal fistulae similar to the most common congenital tracheoesophageal malformations in humans. Interestingly, the dorsoventral patterning determining the dorsal digestive and the ventral respiratory endoderm remained intact, whereas Hedgehog signaling was aberrantly activated. CONCLUSIONS Our results demonstrate the cobblestone mutant to represent one of the very few mouse models that display both correct endodermal dorsoventral specification but defective compartmentalization of the proximal foregut. It stands exemplary for a tracheoesophageal ciliopathy, offering the possibility to elucidate the molecular mechanisms how primary cilia orchestrate the septation process. The plethora of malformations observed in the cobblestone embryo allow for a deeper insight into a putative link between primary cilia and human VATER/VACTERL syndromes.
Collapse
Affiliation(s)
- Lindsey Avery Fitzsimons
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, Maine, U.S.A
- Dept. of Biomedical Sciences, Center for Excellence in the Neurosciences, College of Osteopathic Medicine, University of New England, Biddeford, Maine 04005, U.S.A
| | - Evangelia Tasouri
- Interdisciplinary Center for Neurosciences, University of Heidelberg, 69120 Heidelberg, Germany
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Marc August Willaredt
- Interdisciplinary Center for Neurosciences, University of Heidelberg, 69120 Heidelberg, Germany
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Daniel Stetson
- AstraZeneca Pharmaceuticals LP, 35 Gatehouse Drive, Waltham, Massachusetts 02451, U.S.A
| | - Christian Gojak
- Interdisciplinary Center for Neurosciences, University of Heidelberg, 69120 Heidelberg, Germany
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Joachim Kirsch
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | | | - Karin Gorgas
- Institute of Anatomy and Cell Biology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Kerry L. Tucker
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, Maine, U.S.A
- Dept. of Biomedical Sciences, Center for Excellence in the Neurosciences, College of Osteopathic Medicine, University of New England, Biddeford, Maine 04005, U.S.A
| |
Collapse
|
3
|
Shaikh Qureshi WM, Hentges KE. Functions of cilia in cardiac development and disease. Ann Hum Genet 2024; 88:4-26. [PMID: 37872827 PMCID: PMC10952336 DOI: 10.1111/ahg.12534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 09/08/2023] [Accepted: 10/02/2023] [Indexed: 10/25/2023]
Abstract
Errors in embryonic cardiac development are a leading cause of congenital heart defects (CHDs), including morphological abnormalities of the heart that are often detected after birth. In the past few decades, an emerging role for cilia in the pathogenesis of CHD has been identified, but this topic still largely remains an unexplored area. Mouse forward genetic screens and whole exome sequencing analysis of CHD patients have identified enrichment for de novo mutations in ciliary genes or non-ciliary genes, which regulate cilia-related pathways, linking cilia function to aberrant cardiac development. Key events in cardiac morphogenesis, including left-right asymmetric development of the heart, are dependent upon cilia function. Cilia dysfunction during left-right axis formation contributes to CHD as evidenced by the substantial proportion of heterotaxy patients displaying complex CHD. Cilia-transduced signaling also regulates later events during heart development such as cardiac valve formation, outflow tract septation, ventricle development, and atrioventricular septa formation. In this review, we summarize the role of motile and non-motile (primary cilia) in cardiac asymmetry establishment and later events during heart development.
Collapse
Affiliation(s)
- Wasay Mohiuddin Shaikh Qureshi
- Division of Evolution, Infection and Genomics, School of Biological Sciences, Faculty of Biology, Medicine, and Health, Manchester Academic Health Science CentreUniversity of ManchesterManchesterUK
| | - Kathryn E. Hentges
- Division of Evolution, Infection and Genomics, School of Biological Sciences, Faculty of Biology, Medicine, and Health, Manchester Academic Health Science CentreUniversity of ManchesterManchesterUK
| |
Collapse
|
4
|
Gupta M, Pazour GJ. Intraflagellar transport: A critical player in photoreceptor development and the pathogenesis of retinal degenerative diseases. Cytoskeleton (Hoboken) 2023. [PMID: 38140908 DOI: 10.1002/cm.21823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 12/01/2023] [Accepted: 12/08/2023] [Indexed: 12/24/2023]
Abstract
In vertebrate vision, photons are detected by highly specialized sensory cilia called outer segments. Photoreceptor outer segments form by remodeling the membrane of a primary cilium into a stack of flattened disks. Intraflagellar transport (IFT) is critical to the formation of most types of eukaryotic cilia including the outer segments. This review covers the state of knowledge of the role of IFT in the formation and maintenance of outer segments and the human diseases that result from mutations in genes encoding the IFT complex and associated motors.
Collapse
Affiliation(s)
- Mohona Gupta
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, Massachusetts, USA
- Morningside Graduate School of Biological Sciences, University of Massachusetts Chan Medical School, Worcester, Massachusetts, USA
| | - Gregory J Pazour
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, Massachusetts, USA
| |
Collapse
|
5
|
Abstract
PURPOSE OF REVIEW The purpose of this review is to provide a background on osteocytes and the primary cilium, discussing the role it plays in osteocyte mechanosensing. RECENT FINDINGS Osteocytes are thought to be the primary mechanosensing cells in bone tissue, regulating bone adaptation in response to exercise, with the primary cilium suggested to be a key mechanosensing mechanism in bone. More recent work has suggested that, rather than being direct mechanosensors themselves, primary cilia in bone may instead form a key chemo-signalling nexus for processing mechanoregulated signalling pathways. Recent evidence suggests that pharmacologically induced lengthening of the primary cilium in osteocytes may potentiate greater mechanotransduction, rather than greater mechanosensing. While more research is required to delineate the specific osteocyte mechanobiological molecular mechanisms governed by the primary cilium, it is clear from the literature that the primary cilium has significant potential as a therapeutic target to treat mechanoregulated bone diseases, such as osteoporosis.
Collapse
Affiliation(s)
- Stefaan W Verbruggen
- Department of Mechanical Engineering, University of Sheffield, Sheffield, UK.
- INSIGNEO Institute for in silico Medicine, University of Sheffield, Sheffield, UK.
- Centre for Predictive in vitro Models, Centre for Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK.
| | - Anuphan Sittichokechaiwut
- Department of Preventive Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
- Center of Excellence in Biomaterials, Naresuan University, Phitsanulok, Thailand
| | - Gwendolen C Reilly
- INSIGNEO Institute for in silico Medicine, University of Sheffield, Sheffield, UK
- Kroto Research Institute, Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK
| |
Collapse
|
6
|
Kretschmer V, Schneider S, Matthiessen PA, Reichert D, Hotaling N, Glasßer G, Lieberwirth I, Bharti K, De Cegli R, Conte I, Nandrot EF, May-Simera HL. Deletion of IFT20 exclusively in the RPE ablates primary cilia and leads to retinal degeneration. PLoS Biol 2023; 21:e3002402. [PMID: 38048369 PMCID: PMC10721183 DOI: 10.1371/journal.pbio.3002402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 12/14/2023] [Accepted: 10/26/2023] [Indexed: 12/06/2023] Open
Abstract
Vision impairment places a serious burden on the aging society, affecting the lives of millions of people. Many retinal diseases are of genetic origin, of which over 50% are due to mutations in cilia-associated genes. Most research on retinal degeneration has focused on the ciliated photoreceptor cells of the retina. However, the contribution of primary cilia in other ocular cell types has largely been ignored. The retinal pigment epithelium (RPE) is a monolayer epithelium at the back of the eye intricately associated with photoreceptors and essential for visual function. It is already known that primary cilia in the RPE are critical for its development and maturation; however, it remains unclear whether this affects RPE function and retinal tissue homeostasis. We generated a conditional knockout mouse model, in which IFT20 is exclusively deleted in the RPE, ablating primary cilia. This leads to defective RPE function, followed by photoreceptor degeneration and, ultimately, vision impairment. Transcriptomic analysis offers insights into mechanisms underlying pathogenic changes, which include transcripts related to epithelial homeostasis, the visual cycle, and phagocytosis. Due to the loss of cilia exclusively in the RPE, this mouse model enables us to tease out the functional role of RPE cilia and their contribution to retinal degeneration, providing a powerful tool for basic and translational research in syndromic and non-syndromic retinal degeneration. Non-ciliary mechanisms of IFT20 in the RPE may also contribute to pathogenesis and cannot be excluded, especially considering the increasing evidence of non-ciliary functions of ciliary proteins.
Collapse
Affiliation(s)
- Viola Kretschmer
- Faculty of Biology, Institute of Molecular Physiology, Johannes Gutenberg-University, Mainz, Germany
| | - Sandra Schneider
- Faculty of Biology, Institute of Molecular Physiology, Johannes Gutenberg-University, Mainz, Germany
| | - Peter Andreas Matthiessen
- Faculty of Biology, Institute of Molecular Physiology, Johannes Gutenberg-University, Mainz, Germany
| | - Dominik Reichert
- Faculty of Biology, Institute of Molecular Physiology, Johannes Gutenberg-University, Mainz, Germany
- National Eye Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Nathan Hotaling
- National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Gunnar Glasßer
- Max Planck Institute for Polymer Research, Mainz, Germany
| | | | - Kapil Bharti
- National Eye Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Rossella De Cegli
- Telethon Institute of Genetics and Medicine (TIGEM), Pozzuoli, Italy
| | - Ivan Conte
- Telethon Institute of Genetics and Medicine (TIGEM), Pozzuoli, Italy
- University of Naples “Federico II”, Naples, Italy
| | | | - Helen Louise May-Simera
- Faculty of Biology, Institute of Molecular Physiology, Johannes Gutenberg-University, Mainz, Germany
| |
Collapse
|
7
|
Francis RJB, San Agustin JT, Szabo Rogers HL, Cui C, Jonassen JA, Eguether T, Follit JA, Lo CW, Pazour GJ. Autonomous and non-cell autonomous role of cilia in structural birth defects in mice. PLoS Biol 2023; 21:e3002425. [PMID: 38079449 PMCID: PMC10735189 DOI: 10.1371/journal.pbio.3002425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 12/21/2023] [Accepted: 11/09/2023] [Indexed: 12/21/2023] Open
Abstract
Ciliopathies are associated with wide spectrum of structural birth defects (SBDs), indicating important roles for cilia in development. Here, we provide novel insights into the temporospatial requirement for cilia in SBDs arising from deficiency in Ift140, an intraflagellar transport (IFT) protein regulating ciliogenesis. Ift140-deficient mice exhibit cilia defects accompanied by wide spectrum of SBDs including macrostomia (craniofacial defects), exencephaly, body wall defects, tracheoesophageal fistula (TEF), randomized heart looping, congenital heart defects (CHDs), lung hypoplasia, renal anomalies, and polydactyly. Tamoxifen inducible CAGGCre-ER deletion of a floxed Ift140 allele between E5.5 to 9.5 revealed early requirement for Ift140 in left-right heart looping regulation, mid to late requirement for cardiac outflow septation and alignment, and late requirement for craniofacial development and body wall closure. Surprisingly, CHD were not observed with 4 Cre drivers targeting different lineages essential for heart development, but craniofacial defects and omphalocele were observed with Wnt1-Cre targeting neural crest and Tbx18-Cre targeting epicardial lineage and rostral sclerotome through which trunk neural crest cells migrate. These findings revealed cell autonomous role of cilia in cranial/trunk neural crest-mediated craniofacial and body wall closure defects, while non-cell autonomous multi-lineage interactions underlie CHD pathogenesis, revealing unexpected developmental complexity for CHD associated with ciliopathies.
Collapse
Affiliation(s)
- Richard J. B. Francis
- Department of Developmental Biology, University of Pittsburgh, Rangos Research Center, Pittsburgh, Pennsylvania, United States of America
- Discipline of Biomedical Sciences and Molecular Biology; College of Public Health, Medical and Veterinary Science, James Cook University, Townsville, Australia
| | - Jovenal T. San Agustin
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, Massachusetts, United States of America
| | - Heather L. Szabo Rogers
- Department of Developmental Biology, University of Pittsburgh, Rangos Research Center, Pittsburgh, Pennsylvania, United States of America
- Center for Craniofacial Regeneration, Department of Oral Biology, School of Dental Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Cheng Cui
- Department of Developmental Biology, University of Pittsburgh, Rangos Research Center, Pittsburgh, Pennsylvania, United States of America
| | - Julie A. Jonassen
- Department of Microbiology and Physiological Systems, University of Massachusetts Chan Medical School, Worcester, Massachusetts, United States of America
| | - Thibaut Eguether
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, Massachusetts, United States of America
| | - John A. Follit
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, Massachusetts, United States of America
| | - Cecilia W. Lo
- Department of Developmental Biology, University of Pittsburgh, Rangos Research Center, Pittsburgh, Pennsylvania, United States of America
| | - Gregory J. Pazour
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, Massachusetts, United States of America
| |
Collapse
|
8
|
Bruel AL, Ganga AK, Nosková L, Valenzuela I, Martinovic J, Duffourd Y, Zikánová M, Majer F, Kmoch S, Mohler M, Sun J, Sweeney LK, Martínez-Gil N, Thauvin-Robinet C, Breslow DK. Pathogenic RAB34 variants impair primary cilium assembly and cause a novel oral-facial-digital syndrome. Hum Mol Genet 2023; 32:2822-2831. [PMID: 37384395 PMCID: PMC10481091 DOI: 10.1093/hmg/ddad109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 06/12/2023] [Accepted: 06/17/2023] [Indexed: 07/01/2023] Open
Abstract
Oral-facial-digital syndromes (OFDS) are a group of clinically and genetically heterogeneous disorders characterized by defects in the development of the face and oral cavity along with digit anomalies. Pathogenic variants in over 20 genes encoding ciliary proteins have been found to cause OFDS through deleterious structural or functional impacts on primary cilia. We identified by exome sequencing bi-allelic missense variants in a novel disease-causing ciliary gene RAB34 in four individuals from three unrelated families. Affected individuals presented a novel form of OFDS (OFDS-RAB34) accompanied by cardiac, cerebral, skeletal and anorectal defects. RAB34 encodes a member of the Rab GTPase superfamily and was recently identified as a key mediator of ciliary membrane formation. Unlike many genes required for cilium assembly, RAB34 acts selectively in cell types that use the intracellular ciliogenesis pathway, in which nascent cilia begin to form in the cytoplasm. We find that the protein products of these pathogenic variants, which are clustered near the RAB34 C-terminus, exhibit a strong loss of function. Although some variants retain the ability to be recruited to the mother centriole, cells expressing mutant RAB34 exhibit a significant defect in cilium assembly. While many Rab proteins have been previously linked to ciliogenesis, our studies establish RAB34 as the first small GTPase involved in OFDS and reveal the distinct clinical manifestations caused by impairment of intracellular ciliogenesis.
Collapse
Affiliation(s)
- Ange-Line Bruel
- INSERM U1231 Génétique des Anomalies du Développement (GAD), University Bourgogne Franche-Comté, 21070 Dijon, France
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, Fédération Hospitalo-Universitaire Médecine Translationnelle et Anomalies du Développement (FHU-TRANSLAD), Centre Hospitalo-Universitaire (CHU) Dijon Bourgogne, 21079 Dijon, France
| | - Anil Kumar Ganga
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06511, USA
| | - Lenka Nosková
- Research Unit for Rare Diseases, Department of Pediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague 128 08, Czech Republic
| | - Irene Valenzuela
- Department of Clinical and Molecular Genetics, Vall d'Hebron University Hospital, 08035 Barcelona, Spain
- Medical Genetics Group, Vall d'Hebron Research Institute,08035 Barcelona, Spain
| | - Jelena Martinovic
- Unit of Embryo-Fetal Pathology, AP-HP, Antoine Béclère Hospital, Paris Saclay University, 92141 Clamart, France
| | - Yannis Duffourd
- INSERM U1231 Génétique des Anomalies du Développement (GAD), University Bourgogne Franche-Comté, 21070 Dijon, France
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, Fédération Hospitalo-Universitaire Médecine Translationnelle et Anomalies du Développement (FHU-TRANSLAD), Centre Hospitalo-Universitaire (CHU) Dijon Bourgogne, 21079 Dijon, France
| | - Marie Zikánová
- Research Unit for Rare Diseases, Department of Pediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague 128 08, Czech Republic
| | - Filip Majer
- Research Unit for Rare Diseases, Department of Pediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague 128 08, Czech Republic
| | - Stanislav Kmoch
- Research Unit for Rare Diseases, Department of Pediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague 128 08, Czech Republic
| | - Markéta Mohler
- Institute of Molecular and Clinical Pathology and Medical Genetics, University Hospital Ostrava, Ostrava 708 52, Czech Republic
| | - Jingbo Sun
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06511, USA
| | - Lauren K Sweeney
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06511, USA
| | - Núria Martínez-Gil
- Department of Clinical and Molecular Genetics, Vall d'Hebron University Hospital, 08035 Barcelona, Spain
- Medical Genetics Group, Vall d'Hebron Research Institute,08035 Barcelona, Spain
| | - Christel Thauvin-Robinet
- INSERM U1231 Génétique des Anomalies du Développement (GAD), University Bourgogne Franche-Comté, 21070 Dijon, France
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, Fédération Hospitalo-Universitaire Médecine Translationnelle et Anomalies du Développement (FHU-TRANSLAD), Centre Hospitalo-Universitaire (CHU) Dijon Bourgogne, 21079 Dijon, France
- Centre de Génétique et Centre de référence maladies rares ‘Anomalies du Développement et Syndromes Malformatifs’, FHU-TRANSLAD, Hôpital d'Enfants, CHU Dijon Bourgogne, 21079 Dijon, France
| | - David K Breslow
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06511, USA
| |
Collapse
|
9
|
Clearman KR, Haycraft CJ, Croyle MJ, Collawn JF, Yoder BK. Functions of the primary cilium in the kidney and its connection with renal diseases. Curr Top Dev Biol 2023; 155:39-94. [PMID: 38043952 DOI: 10.1016/bs.ctdb.2023.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
The nonmotile primary cilium is a sensory structure found on most mammalian cell types that integrates multiple signaling pathways involved in tissue development and postnatal function. As such, mutations disrupting cilia activities cause a group of disorders referred to as ciliopathies. These disorders exhibit a wide spectrum of phenotypes impacting nearly every tissue. In the kidney, primary cilia dysfunction caused by mutations in polycystin 1 (Pkd1), polycystin 2 (Pkd2), or polycystic kidney and hepatic disease 1 (Pkhd1), result in polycystic kidney disease (PKD), a progressive disorder causing renal functional decline and end-stage renal disease. PKD affects nearly 1 in 1000 individuals and as there is no cure for PKD, patients frequently require dialysis or renal transplantation. Pkd1, Pkd2, and Pkhd1 encode membrane proteins that all localize in the cilium. Pkd1 and Pkd2 function as a nonselective cation channel complex while Pkhd1 protein function remains uncertain. Data indicate that the cilium may act as a mechanosensor to detect fluid movement through renal tubules. Other functions proposed for the cilium and PKD proteins in cyst development involve regulation of cell cycle and oriented division, regulation of renal inflammation and repair processes, maintenance of epithelial cell differentiation, and regulation of mitochondrial structure and metabolism. However, how loss of cilia or cilia function leads to cyst development remains elusive. Studies directed at understanding the roles of Pkd1, Pkd2, and Pkhd1 in the cilium and other locations within the cell will be important for developing therapeutic strategies to slow cyst progression.
Collapse
Affiliation(s)
- Kelsey R Clearman
- Department of Cell, Developmental, and Integrative Biology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Courtney J Haycraft
- Department of Cell, Developmental, and Integrative Biology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Mandy J Croyle
- Department of Cell, Developmental, and Integrative Biology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - James F Collawn
- Department of Cell, Developmental, and Integrative Biology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Bradley K Yoder
- Department of Cell, Developmental, and Integrative Biology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States.
| |
Collapse
|
10
|
Dobbelaere J, Su TY, Erdi B, Schleiffer A, Dammermann A. A phylogenetic profiling approach identifies novel ciliogenesis genes in Drosophila and C. elegans. EMBO J 2023; 42:e113616. [PMID: 37317646 PMCID: PMC10425847 DOI: 10.15252/embj.2023113616] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 05/22/2023] [Accepted: 06/01/2023] [Indexed: 06/16/2023] Open
Abstract
Cilia are cellular projections that perform sensory and motile functions in eukaryotic cells. A defining feature of cilia is that they are evolutionarily ancient, yet not universally conserved. In this study, we have used the resulting presence and absence pattern in the genomes of diverse eukaryotes to identify a set of 386 human genes associated with cilium assembly or motility. Comprehensive tissue-specific RNAi in Drosophila and mutant analysis in C. elegans revealed signature ciliary defects for 70-80% of novel genes, a percentage similar to that for known genes within the cluster. Further characterization identified different phenotypic classes, including a set of genes related to the cartwheel component Bld10/CEP135 and two highly conserved regulators of cilium biogenesis. We propose this dataset defines the core set of genes required for cilium assembly and motility across eukaryotes and presents a valuable resource for future studies of cilium biology and associated disorders.
Collapse
Affiliation(s)
- Jeroen Dobbelaere
- Max Perutz LabsUniversity of Vienna, Vienna Biocenter (VBC)ViennaAustria
| | - Tiffany Y Su
- Max Perutz LabsUniversity of Vienna, Vienna Biocenter (VBC)ViennaAustria
- Vienna BioCenter PhD ProgramDoctoral School of the University of Vienna and Medical University of ViennaViennaAustria
| | - Balazs Erdi
- Max Perutz LabsUniversity of Vienna, Vienna Biocenter (VBC)ViennaAustria
| | - Alexander Schleiffer
- Research Institute of Molecular Pathology, Vienna Biocenter (VBC)ViennaAustria
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna Biocenter (VBC)ViennaAustria
| | | |
Collapse
|
11
|
Bakey Z, Cabrera OA, Hoefele J, Antony D, Wu K, Stuck MW, Micha D, Eguether T, Smith AO, van der Wel NN, Wagner M, Strittmatter L, Beales PL, Jonassen JA, Thiffault I, Cadieux-Dion M, Boyes L, Sharif S, Tüysüz B, Dunstheimer D, Niessen HWM, Devine W, Lo CW, Mitchison HM, Schmidts M, Pazour GJ. IFT74 variants cause skeletal ciliopathy and motile cilia defects in mice and humans. PLoS Genet 2023; 19:e1010796. [PMID: 37315079 DOI: 10.1371/journal.pgen.1010796] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 05/23/2023] [Indexed: 06/16/2023] Open
Abstract
Motile and non-motile cilia play critical roles in mammalian development and health. These organelles are composed of a 1000 or more unique proteins, but their assembly depends entirely on proteins synthesized in the cell body and transported into the cilium by intraflagellar transport (IFT). In mammals, malfunction of non-motile cilia due to IFT dysfunction results in complex developmental phenotypes that affect most organs. In contrast, disruption of motile cilia function causes subfertility, disruption of the left-right body axis, and recurrent airway infections with progressive lung damage. In this work, we characterize allele specific phenotypes resulting from IFT74 dysfunction in human and mice. We identified two families carrying a deletion encompassing IFT74 exon 2, the first coding exon, resulting in a protein lacking the first 40 amino acids and two individuals carrying biallelic splice site mutations. Homozygous exon 2 deletion cases presented a ciliary chondrodysplasia with narrow thorax and progressive growth retardation along with a mucociliary clearance disorder phenotype with severely shorted cilia. Splice site variants resulted in a lethal skeletal chondrodysplasia phenotype. In mice, removal of the first 40 amino acids likewise results in a motile cilia phenotype but with little effect on primary cilia structure. Mice carrying this allele are born alive but are growth restricted and developed hydrocephaly in the first month of life. In contrast, a strong, likely null, allele of Ift74 in mouse completely blocks ciliary assembly and causes severe heart defects and midgestational lethality. In vitro studies suggest that the first 40 amino acids of IFT74 are dispensable for binding of other IFT subunits but are important for tubulin binding. Higher demands on tubulin transport in motile cilia compared to primary cilia resulting from increased mechanical stress and repair needs could account for the motile cilia phenotype observed in human and mice.
Collapse
Affiliation(s)
- Zeineb Bakey
- Center for Pediatrics and Adolescent Medicine, University Hospital Freiburg, Freiburg University Faculty of Medicine, Freiburg, Germany
- Human Genetics Department, Radboud University Medical Center Nijmegen and Radboud Institute for Molecular Life Sciences (RIMLS), Nijmegen, The Netherlands
| | - Oscar A Cabrera
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Biotech II, Worcester, Massachusetts, United States of America
| | - Julia Hoefele
- Institute for Human Genetics, Technical University Munich (TUM), School of Medicine, Munich, Germany
| | - Dinu Antony
- Center for Pediatrics and Adolescent Medicine, University Hospital Freiburg, Freiburg University Faculty of Medicine, Freiburg, Germany
- Human Genetics Department, Radboud University Medical Center Nijmegen and Radboud Institute for Molecular Life Sciences (RIMLS), Nijmegen, The Netherlands
| | - Kaman Wu
- Human Genetics Department, Radboud University Medical Center Nijmegen and Radboud Institute for Molecular Life Sciences (RIMLS), Nijmegen, The Netherlands
| | - Michael W Stuck
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Biotech II, Worcester, Massachusetts, United States of America
| | - Dimitra Micha
- Department of Human Genetics, Amsterdam Movement Sciences, Amsterdam UMC, Amsterdam, The Netherlands
| | - Thibaut Eguether
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Biotech II, Worcester, Massachusetts, United States of America
| | - Abigail O Smith
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Biotech II, Worcester, Massachusetts, United States of America
| | - Nicole N van der Wel
- Electron microscopy Center Amsterdam, Department of Medical Biology, VUMC, Amsterdam, The Netherlands
| | - Matias Wagner
- Institute for Human Genetics, Technical University Munich (TUM), School of Medicine, Munich, Germany
| | - Lara Strittmatter
- Electron Microscopy Core, University of Massachusetts Chan Medical School, Worcester, Massachusetts, United States of America
| | - Philip L Beales
- Genetics and Genomic Medicine Programme, University College London, UCL Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Julie A Jonassen
- Department of Microbiology and Physiological Systems, University of Massachusetts Chan Medical School, Worcester, Massachusetts, United States of America
| | - Isabelle Thiffault
- Genomic Medicine Center, Children's Mercy Hospital, Kansas City, Missouri, United States of America
| | - Maxime Cadieux-Dion
- Genomic Medicine Center, Children's Mercy Hospital, Kansas City, Missouri, United States of America
| | - Laura Boyes
- West Midlands Genomic Medicine Hub, Birmingham Women's Hospital, Birmingham, United Kingdom
| | - Saba Sharif
- West Midlands Genomic Medicine Hub, Birmingham Women's Hospital, Birmingham, United Kingdom
| | - Beyhan Tüysüz
- Department of Pediatrics, Division of Pediatric Genetics, Cerrahpasa Medical Faculty, University-Cerrahpasa, Istanbul, Turkey
| | - Desiree Dunstheimer
- Center for Pediatrics and Adolescent Medicine, University Hospital Augsburg, Augsburg, Germany
| | - Hans W M Niessen
- Department of Pathology, Amsterdam University Medical Center (AUMC), Amsterdam, The Netherlands
| | - William Devine
- Department of Developmental Biology, University of Pittsburgh, 8111 Rangos Research Center, Pittsburgh, Pennsylvania, United States of America
| | - Cecilia W Lo
- Department of Developmental Biology, University of Pittsburgh, 8111 Rangos Research Center, Pittsburgh, Pennsylvania, United States of America
| | - Hannah M Mitchison
- Genetics and Genomic Medicine Programme, University College London, UCL Great Ormond Street Institute of Child Health, London, United Kingdom
| | - Miriam Schmidts
- Center for Pediatrics and Adolescent Medicine, University Hospital Freiburg, Freiburg University Faculty of Medicine, Freiburg, Germany
- Human Genetics Department, Radboud University Medical Center Nijmegen and Radboud Institute for Molecular Life Sciences (RIMLS), Nijmegen, The Netherlands
- CIBSS-Center for Integrative Biological Signaling Studies, University of Freiburg, Freiburg, Germany
| | - Gregory J Pazour
- Program in Molecular Medicine, University of Massachusetts Chan Medical School, Biotech II, Worcester, Massachusetts, United States of America
| |
Collapse
|
12
|
Francis R, San Agustin JT, Szabo Rogers HL, Cui C, Jonassen JA, Eguether T, Follit JA, Lo CW, Pazour GJ. Autonomous and non-cell autonomous etiology of ciliopathy associated structural birth defects. bioRxiv 2023:2023.06.07.544132. [PMID: 37333142 PMCID: PMC10274801 DOI: 10.1101/2023.06.07.544132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2023]
Abstract
Ciliopathies are associated with wide spectrum of structural birth defects (SBD), indicating important roles for cilia in development. Here we provide novel insights into the temporospatial requirement for cilia in SBDs arising from deficiency in Ift140 , an intraflagellar transport protein regulating ciliogenesis. Ift140 deficient mice exhibit cilia defects accompanied by wide spectrum of SBDs including macrostomia (craniofacial defects), exencephaly, body wall defects, tracheoesophageal fistula, randomized heart looping, congenital heart defects (CHD), lung hypoplasia, renal anomalies, and polydactyly. Tamoxifen inducible CAG-Cre deletion of a floxed Ift140 allele between E5.5 to 9.5 revealed early requirement for Ift140 in left-right heart looping regulation, mid to late requirement for cardiac outflow septation and alignment, and late requirement for craniofacial development and body wall closure. Surprisingly, CHD was not observed with four Cre drivers targeting different lineages essential for heart development, but craniofacial defects and omphalocele were observed with Wnt1-Cre targeting neural crest and Tbx18-Cre targeting epicardial lineage and rostral sclerotome through which trunk neural crest cells migrate. These findings revealed cell autonomous role of cilia in cranial/trunk neural crest mediated craniofacial and body wall closure defects, while non-cell autonomous multi-lineage interactions underlie CHD pathogenesis, revealing unexpected developmental complexity for CHD associated with ciliopathy.
Collapse
|
13
|
Bakey Z, Cabrera OA, Hoefele J, Antony D, Wu K, Stuck MW, Micha D, Eguether T, Smith AO, van der Wel NN, Wagner M, Strittmatter L, Beales PL, Jonassen JA, Thiffault I, Cadieux-Dion M, Boyes L, Sharif S, Tüysüz B, Dunstheimer D, Niessen HW, Devine W, Lo CW, Mitchison HM, Schmidts M, Pazour GJ. IFT74 variants cause skeletal ciliopathy and motile cilia defects in mice and humans. medRxiv 2023:2023.02.23.23286106. [PMID: 36865301 PMCID: PMC9980244 DOI: 10.1101/2023.02.23.23286106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
Abstract
Motile and non-motile cilia are critical to mammalian development and health. Assembly of these organelles depends on proteins synthesized in the cell body and transported into the cilium by intraflagellar transport (IFT). A series of human and mouse IFT74 variants were studied to understand the function of this IFT subunit. Humans missing exon 2, which codes for the first 40 residues, presented an unusual combination of ciliary chondrodysplasia and mucociliary clearance disorders while individuals carrying biallelic splice site variants developed a lethal skeletal chondrodysplasia. In mice, variants thought to remove all Ift74 function, completely block ciliary assembly and result in midgestational lethality. A mouse allele that removes the first 40 amino acids, analogous to the human exon 2 deletion, results in a motile cilia phenotype with mild skeletal abnormalities. In vitro studies suggest that the first 40 amino acids of IFT74 are dispensable for binding of other IFT subunits but are important for tubulin binding. Higher demands on tubulin transport in motile cilia compared to primary cilia could account for the motile cilia phenotype observed in human and mice.
Collapse
|
14
|
Reed M, Takemaru KI, Ying G, Frederick JM, Baehr W. Deletion of CEP164 in mouse photoreceptors post-ciliogenesis interrupts ciliary intraflagellar transport (IFT). PLoS Genet 2022; 18:e1010154. [PMID: 36074756 PMCID: PMC9488791 DOI: 10.1371/journal.pgen.1010154] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 09/20/2022] [Accepted: 07/20/2022] [Indexed: 11/18/2022] Open
Abstract
Centrosomal protein of 164 kDa (CEP164) is located at distal appendages of primary cilia and is necessary for basal body (BB) docking to the apical membrane. To investigate the function of photoreceptor CEP164 before and after BB docking, we deleted CEP164 during retina embryonic development (Six3Cre), in postnatal rod photoreceptors (iCre75) and in mature retina using tamoxifen induction (Prom1-ETCre). BBs dock to the cell cortex during postnatal day 6 (P6) to extend a connecting cilium (CC) and an axoneme. P6 retina-specific knockouts (retCep164-/-) are unable to dock BBs, thereby preventing formation of CC or outer segments (OSs). In rod-specific knockouts (rodCep164-/-), Cre expression starts after P7 and CC/OS form. P16 rodCep164-/- rods have nearly normal OS lengths, and maintain OS attachment through P21 despite loss of CEP164. Intraflagellar transport components (IFT88, IFT57 and IFT140) were reduced at P16 rodCep164-/- BBs and CC tips and nearly absent at P21, indicating impaired intraflagellar transport. Nascent OS discs, labeled with a fluorescent dye on P14 and P18 and harvested on P19, showed continued rodCep164-/- disc morphogenesis but absence of P14 discs mid-distally, indicating OS instability. Tamoxifen induction with PROM1ETCre;Cep164F/F (tamCep164-/-) adult mice affected maintenance of both rod and cone OSs. The results suggest that CEP164 is key towards recruitment and stabilization of IFT-B particles at the BB/CC. IFT impairment may be the main driver of ciliary malfunction observed with hypomorphic CEP164 mutations.
Collapse
Affiliation(s)
- Michelle Reed
- Department of Ophthalmology, University of Utah Health Science Center, Salt Lake City, Utah, United States of America
| | - Ken-Ichi Takemaru
- Stony Brook University, Department of Pharmacological Sciences, Stony Brook, New York, United States of America
| | - Guoxin Ying
- Department of Ophthalmology, University of Utah Health Science Center, Salt Lake City, Utah, United States of America
| | - Jeanne M. Frederick
- Department of Ophthalmology, University of Utah Health Science Center, Salt Lake City, Utah, United States of America
| | - Wolfgang Baehr
- Department of Ophthalmology, University of Utah Health Science Center, Salt Lake City, Utah, United States of America
- Department of Neurobiology & Anatomy, University of Utah, Salt Lake City, Utah, United States of America
- Department of Biology, University of Utah, Salt Lake City, Utah, United States of America
| |
Collapse
|
15
|
Müller M, Gorek L, Kamm N, Jacob R. Manipulation of the Tubulin Code Alters Directional Cell Migration and Ciliogenesis. Front Cell Dev Biol 2022; 10:901999. [PMID: 35903547 PMCID: PMC9315229 DOI: 10.3389/fcell.2022.901999] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 06/15/2022] [Indexed: 11/23/2022] Open
Abstract
Conjunction of epithelial cells into monolayer sheets implies the ability to migrate and to undergo apicobasal polarization. Both processes comprise reorganization of cytoskeletal elements and rearrangements of structural protein interactions. We modulated expression of tubulin tyrosin ligase (TTL), the enzyme that adds tyrosine to the carboxy terminus of detyrosinated α-tubulin, to study the role of tubulin detyrosination/-tyrosination in the orientation of cell motility and in epithelial morphogenesis. Oriented cell migration and the organization of focal adhesions significantly lose directionality with diminishing amounts of microtubules enriched in detyrosinated tubulin. On the other hand, increasing quantities of detyrosinated tubulin results in faster plus end elongation of microtubules in migrating and in polarized epithelial cells. These plus ends are decorated by the plus end binding protein 1 (EB1), which mediates interaction between microtubules enriched in detyrosinated tubulin and the integrin-ILK complex at focal adhesions. EB1 accumulates at the apical cell pole at the base of the primary cilium following apicobasal polarization. Polarized cells almost devoid of detyrosinated tubulin form stunted primary cilia and multiluminal cysts in 3D-matrices. We conclude that the balance between detyrosinated and tyrosinated tubulin alters microtubule dynamics, affects the orientation of focal adhesions and determines the organization of primary cilia on epithelial cells.
Collapse
Affiliation(s)
- Manuel Müller
- Department of Cell Biology and Cell Pathology, Philipps-Universität Marburg, Marburg, Germany
- DFG Research Training Group, Membrane Plasticity in Tissue Development and Remodelling, GRK 2213, Philipps-Universität Marburg, Marburg, Germany
| | - Lena Gorek
- Department of Cell Biology and Cell Pathology, Philipps-Universität Marburg, Marburg, Germany
| | - Natalia Kamm
- Department of Cell Biology and Cell Pathology, Philipps-Universität Marburg, Marburg, Germany
| | - Ralf Jacob
- Department of Cell Biology and Cell Pathology, Philipps-Universität Marburg, Marburg, Germany
- DFG Research Training Group, Membrane Plasticity in Tissue Development and Remodelling, GRK 2213, Philipps-Universität Marburg, Marburg, Germany
- *Correspondence: Ralf Jacob,
| |
Collapse
|
16
|
Cantero MDR, Cantiello HF. Polycystin-2 (TRPP2): Ion channel properties and regulation. Gene 2022; 827:146313. [PMID: 35314260 DOI: 10.1016/j.gene.2022.146313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 01/19/2022] [Accepted: 02/08/2022] [Indexed: 12/01/2022]
Abstract
Polycystin-2 (TRPP2, PKD2, PC2) is the product of the PKD2 gene, whose mutations cause Autosomal Dominant Polycystic Kidney Disease (ADPKD). PC2 belongs to the superfamily of TRP (Transient Receptor Potential) proteins that generally function as Ca2+-permeable nonselective cation channels implicated in Ca2+ signaling. PC2 localizes to various cell domains with distinct functions that likely depend on interactions with specific channel partners. Functions include receptor-operated, nonselective cation channel activity in the plasma membrane, intracellular Ca2+ release channel activity in the endoplasmic reticulum (ER), and mechanosensitive channel activity in the primary cilium of renal epithelial cells. Here we summarize our current understanding of the properties of PC2 and how other transmembrane and cytosolic proteins modulate this activity, providing functional diversity and selective regulatory mechanisms to its role in the control of cellular Ca2+ homeostasis.
Collapse
Affiliation(s)
- María Del Rocío Cantero
- Laboratorio de Canales Iónicos, Instituto Multidisciplinario de Salud, Tecnología y Desarrollo (IMSaTeD, CONICET-UNSE), El Zanjón, Santiago del Estero 4206, Argentina.
| | - Horacio F Cantiello
- Laboratorio de Canales Iónicos, Instituto Multidisciplinario de Salud, Tecnología y Desarrollo (IMSaTeD, CONICET-UNSE), El Zanjón, Santiago del Estero 4206, Argentina
| |
Collapse
|
17
|
Bumann EE, Hahn Leat P, Wang HH, Hufft-martinez BM, Wang W, Tran PV. Genetic Interaction of Thm2 and Thm1 Shapes Postnatal Craniofacial Bone. J Dev Biol 2022; 10:17. [PMID: 35645293 PMCID: PMC9149932 DOI: 10.3390/jdb10020017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/04/2022] [Accepted: 05/09/2022] [Indexed: 11/17/2022] Open
Abstract
Ciliopathies are genetic syndromes that link skeletal dysplasias to the dysfunction of primary cilia. Primary cilia are sensory organelles synthesized by intraflagellar transport (IFT)—A and B complexes, which traffic protein cargo along a microtubular core. We have reported that the deletion of the IFT-A gene, Thm2, together with a null allele of its paralog, Thm1, causes a small skeleton with a small mandible or micrognathia in juvenile mice. Using micro-computed tomography, here we quantify the craniofacial defects of Thm2−/−; Thm1aln/+ triple allele mutant mice. At postnatal day 14, triple allele mutant mice exhibited micrognathia, midface hypoplasia, and a decreased facial angle due to shortened upper jaw length, premaxilla, and nasal bones, reflecting altered development of facial anterior-posterior elements. Mutant mice also showed increased palatal width, while other aspects of the facial transverse, as well as vertical dimensions, remained intact. As such, other ciliopathy-related craniofacial defects, such as cleft lip and/or palate, hypo-/hypertelorism, broad nasal bridge, craniosynostosis, and facial asymmetry, were not observed. Calvarial-derived osteoblasts of triple allele mutant mice showed reduced bone formation in vitro that was ameliorated by Hedgehog agonist, SAG. Together, these data indicate that Thm2 and Thm1 genetically interact to regulate bone formation and sculpting of the postnatal face. The triple allele mutant mice present a novel model to study craniofacial bone development.
Collapse
|
18
|
Cruz NM, Reddy R, McFaline-Figueroa JL, Tran C, Fu H, Freedman BS. Modelling ciliopathy phenotypes in human tissues derived from pluripotent stem cells with genetically ablated cilia. Nat Biomed Eng 2022; 6:463-475. [PMID: 35478224 PMCID: PMC9228023 DOI: 10.1038/s41551-022-00880-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 03/08/2022] [Indexed: 11/08/2022]
Abstract
The functions of cilia-antenna-like organelles associated with a spectrum of disease states-are poorly understood, particularly in human cells. Here we show that human pluripotent stem cells (hPSCs) edited via CRISPR to knock out the kinesin-2 subunits KIF3A or KIF3B can be used to model ciliopathy phenotypes and to reveal ciliary functions at the tissue scale. KIF3A-/- and KIF3B-/- hPSCs lacked cilia, yet remained robustly self-renewing and pluripotent. Tissues and organoids derived from these hPSCs displayed phenotypes that recapitulated defective neurogenesis and nephrogenesis, polycystic kidney disease (PKD) and other features of the ciliopathy spectrum. We also show that human cilia mediate a critical switch in hedgehog signalling during organoid differentiation, and that they constitutively release extracellular vesicles containing signalling molecules associated with ciliopathy phenotypes. The capacity of KIF3A-/- and KIF3B-/- hPSCs to reveal endogenous mechanisms underlying complex ciliary phenotypes may facilitate the discovery of candidate therapeutics.
Collapse
Affiliation(s)
- Nelly M Cruz
- Division of Nephrology, University of Washington School of Medicine, Seattle, WA, USA
- Kidney Research Institute, Seattle, WA, USA
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA, USA
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | - Raghava Reddy
- Division of Nephrology, University of Washington School of Medicine, Seattle, WA, USA
- Kidney Research Institute, Seattle, WA, USA
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA, USA
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | | | - Christine Tran
- Division of Nephrology, University of Washington School of Medicine, Seattle, WA, USA
- Kidney Research Institute, Seattle, WA, USA
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA, USA
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | - Hongxia Fu
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA, USA
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
- Division of Hematology, University of Washington School of Medicine, Seattle, WA, USA
- Department of Bioengineering (Adjunct), University of Washington School of Medicine, Seattle, WA, USA
| | - Benjamin S Freedman
- Division of Nephrology, University of Washington School of Medicine, Seattle, WA, USA.
- Kidney Research Institute, Seattle, WA, USA.
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA, USA.
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA.
- Department of Bioengineering (Adjunct), University of Washington School of Medicine, Seattle, WA, USA.
- Department of Laboratory Medicine and Pathology (Adjunct), University of Washington School of Medicine, Seattle, WA, USA.
| |
Collapse
|
19
|
Di Minin G, Holzner M, Grison A, Dumeau CE, Chan W, Monfort A, Jerome-Majewska LA, Roelink H, Wutz A. TMED2 binding restricts SMO to the ER and Golgi compartments. PLoS Biol 2022; 20:e3001596. [PMID: 35353806 PMCID: PMC9000059 DOI: 10.1371/journal.pbio.3001596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 04/11/2022] [Accepted: 03/07/2022] [Indexed: 11/30/2022] Open
Abstract
Hedgehog (HH) signaling is important for embryonic pattering and stem cell differentiation. The G protein–coupled receptor (GPCR) Smoothened (SMO) is the key HH signal transducer modulating both transcription-dependent and transcription-independent responses. We show that SMO protects naive mouse embryonic stem cells (ESCs) from dissociation-induced cell death. We exploited this SMO dependency to perform a genetic screen in haploid ESCs where we identify the Golgi proteins TMED2 and TMED10 as factors for SMO regulation. Super-resolution microscopy shows that SMO is normally retained in the endoplasmic reticulum (ER) and Golgi compartments, and we demonstrate that TMED2 binds to SMO, preventing localization to the plasma membrane. Mutation of TMED2 allows SMO accumulation at the plasma membrane, recapitulating early events after HH stimulation. We demonstrate the physiologic relevance of this interaction in neural differentiation, where TMED2 functions to repress HH signal strength. Identification of TMED2 as a binder and upstream regulator of SMO opens the way for unraveling the events in the ER–Golgi leading to HH signaling activation. Hedgehog signals orchestrate tissue patterning by binding the receptor Patched and restricting the signal transducer Smoothened. A genetic screen reveals Tmed2 as a new interactor of Smoothened that is required for regulating Smoothened transport from the endoplasmic reticulum and Golgi to the plasma membrane and hence modulating the strength of Hedgehog signal transduction.
Collapse
Affiliation(s)
- Giulio Di Minin
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology ETH Hönggerberg, Zurich, Switzerland
- * E-mail: (GDM); (AW)
| | - Markus Holzner
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology ETH Hönggerberg, Zurich, Switzerland
| | - Alice Grison
- Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Charles E. Dumeau
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology ETH Hönggerberg, Zurich, Switzerland
| | - Wesley Chan
- Department Anatomy and Cell Biology, Human Genetics and McGill University, Montreal, Canada
- Department of Pediatrics, Human Genetics and McGill University, Montreal, Canada
| | - Asun Monfort
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology ETH Hönggerberg, Zurich, Switzerland
| | - Loydie A. Jerome-Majewska
- Department Anatomy and Cell Biology, Human Genetics and McGill University, Montreal, Canada
- Department of Pediatrics, Human Genetics and McGill University, Montreal, Canada
| | - Henk Roelink
- Department of Molecular and Cell Biology, University of California, Berkeley, California, United States of America
| | - Anton Wutz
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology ETH Hönggerberg, Zurich, Switzerland
- * E-mail: (GDM); (AW)
| |
Collapse
|
20
|
Kudo T, Kawasaki M, Kawasaki K, Meguro F, Nihara J, Honda I, Kitamura M, Fujita A, Osawa K, Ichikawa K, Nagai T, Ishida Y, Sharpe PT, Maeda T, Saito I, Ohazama A. Ift88 regulates enamel formation via involving Shh signaling. Oral Dis 2022; 29:1622-1631. [PMID: 35189017 DOI: 10.1111/odi.14162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 02/04/2022] [Accepted: 02/17/2022] [Indexed: 11/28/2022]
Abstract
OBJECTIVES The ciliopathies are a wide spectrum of human diseases, which are caused by perturbations in the function of primary cilia. Tooth enamel anomalies are often seen in ciliopathy patients; however, the role of primary cilia in enamel formation remains unclear. MATERIALS AND METHODS We examined mice with epithelial conditional deletion of the ciliary protein, Ift88, (Ift88fl/fl ;K14Cre). RESULTS Ift88fl/fl ;K14Cre mice showed premature abrasion in molars. A pattern of enamel rods which is determined at secretory stage, was disorganized in Ift88 mutant molars. Many amelogenesis-related molecules expressing at the secretory stage, including amelogenin and ameloblastin, enamelin, showed significant downregulation in Ift88 mutant molar tooth germs. Shh signaling is essential for amelogenesis, which was found to be downregulated in Ift88 mutant molar at the secretory stage. Application of Shh signaling agonist at the secretory stage partially rescued enamel anomalies in Ift88 mutant mice. CONCLUSION Findings in the present study indicate that the function of the primary cilia via Ift88 is critical for the secretory stage of amelogenesis through involving Shh signaling.
Collapse
Affiliation(s)
- Takehisa Kudo
- Division of Oral Anatomy, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,Division of Orthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Maiko Kawasaki
- Division of Oral Anatomy, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Kataushige Kawasaki
- Division of Oral Anatomy, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,Research Center for Advanced Oral Science, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Fumiya Meguro
- Division of Oral Anatomy, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Jun Nihara
- Division of Oral Anatomy, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,Division of Orthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Izumi Honda
- Division of Oral Anatomy, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,Division of Orthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Madoka Kitamura
- Division of Oral Anatomy, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,Division of Orthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Akira Fujita
- Division of Orthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Kazuaki Osawa
- Division of Orthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Kaya Ichikawa
- Division of Orthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Takahiro Nagai
- Division of Oral Anatomy, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,Division of Oral and Maxillofacial Surgery, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Yoko Ishida
- Research Center for Advanced Oral Science, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Paul T Sharpe
- Centre for Craniofacial & Regenerative Biology, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, Guy's Hospital, London, SE1 9RT, UK
| | - Takeyasu Maeda
- Division of Oral and Maxillofacial Surgery, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,Faculty of Dental Medicine, University of Airlangga, Surabaya, Indonesia
| | - Isao Saito
- Division of Orthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Atsushi Ohazama
- Division of Oral Anatomy, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| |
Collapse
|
21
|
Constable S, White K, Somatilaka BN, Mukhopadhyay S. Studying Hedgehog Signaling During Mouse Neural Tube Development. Methods Mol Biol 2022; 2374:59-71. [PMID: 34562243 DOI: 10.1007/978-1-0716-1701-4_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
The identity of ventral neural progenitors in the neural tube is largely dependent on Hedgehog (Hh) signaling. Variations in staining patterns are excellent indicators of aberrant Hh signaling. Here we describe the basic protocol to stain for progenitor populations based on transcription factor expression. We also provide an overview of ciliary and centrosomal staining in the neural tube.
Collapse
|
22
|
Yanardag S, Pugacheva EN. Primary Cilium Is Involved in Stem Cell Differentiation and Renewal through the Regulation of Multiple Signaling Pathways. Cells 2021; 10:1428. [PMID: 34201019 PMCID: PMC8226522 DOI: 10.3390/cells10061428] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 06/02/2021] [Accepted: 06/04/2021] [Indexed: 12/15/2022] Open
Abstract
Signaling networks guide stem cells during their lineage specification and terminal differentiation. Primary cilium, an antenna-like protrusion, directly or indirectly plays a significant role in this guidance. All stem cells characterized so far have primary cilia. They serve as entry- or check-points for various signaling events by controlling the signal transduction and stability. Thus, defects in the primary cilia formation or dynamics cause developmental and health problems, including but not limited to obesity, cardiovascular and renal anomalies, hearing and vision loss, and even cancers. In this review, we focus on the recent findings of how primary cilium controls various signaling pathways during stem cell differentiation and identify potential gaps in the field for future research.
Collapse
Affiliation(s)
- Sila Yanardag
- Department of Biochemistry, School of Medicine, West Virginia University, Morgantown, WV 26506, USA;
| | - Elena N. Pugacheva
- Department of Biochemistry, School of Medicine, West Virginia University, Morgantown, WV 26506, USA;
- West Virginia University Cancer Institute, School of Medicine, West Virginia University, Morgantown, WV 26506, USA
| |
Collapse
|
23
|
Stuck MW, Chong WM, Liao JC, Pazour GJ. Rab34 is necessary for early stages of intracellular ciliogenesis. Curr Biol 2021; 31:2887-2894.e4. [PMID: 33989524 DOI: 10.1016/j.cub.2021.04.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/17/2021] [Accepted: 04/09/2021] [Indexed: 01/04/2023]
Abstract
Primary cilia are sensory organelles present on most vertebrate cells and are critical for development and health. Ciliary dysfunction is associated with a large class of human pathologies collectively known as ciliopathies. These include cystic kidneys, blindness, obesity, skeletal malformations, and other organ anomalies. Using a proximity biotinylation with Ift27 as bait, we identified the small guanosine triphosphatase (GTPase) Rab34 as a ciliary protein. Rab34 localizes to the centrosomes near the mother centriole, the axoneme of developed cilia, and highly dynamic tubule structures in the centrosomal region. Rab34 is required for cilia formation in fibroblasts, where we find that Rab34 loss blocks ciliogenesis at an early step of ciliary vesicle formation. In inner medullary collecting duct (IMCD3) epithelial cells, the requirement is more complex, with Rab34 needed in cells grown at low density but becoming less important as cell density increases. Ciliogenesis can proceed by an internal pathway where cilia form in the cytoplasm before being displayed on the ciliary surface or cilia can assemble by an external pathway where the centriole docks on the plasma membrane before ciliary assembly. Fibroblasts are thought to use the internal pathway, although IMCD3 cells are thought to use the external pathway. However, we find that IMCD3 cells can use the internal assembly pathway and significant numbers of internally assembling cilia are observed in low-density cells. Together, our work indicates that Rab34 is required for internal assembly of cilia, but not for cilia built on the cell surface.
Collapse
Affiliation(s)
- Michael W Stuck
- Program in Molecular Medicine, University of Massachusetts Medical School, Biotech II, Suite 213, 373 Plantation Street, Worcester, MA 01605, USA
| | - Weng Man Chong
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
| | - Jung-Chi Liao
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
| | - Gregory J Pazour
- Program in Molecular Medicine, University of Massachusetts Medical School, Biotech II, Suite 213, 373 Plantation Street, Worcester, MA 01605, USA.
| |
Collapse
|
24
|
Rockwell DM, O'Connor AK, Bentley-Ford MR, Haycraft CJ, Croyle MJ, Brewer KM, Berbari NF, Kesterson RA, Yoder BK. A transgenic Alx4-CreER mouse to analyze anterior limb and nephric duct development. Dev Dyn 2021; 251:1524-1534. [PMID: 33728725 DOI: 10.1002/dvdy.328] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 03/12/2021] [Accepted: 03/12/2021] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Genetic tools to study gene function and the fate of cells in the anterior limb bud are very limited. RESULTS We describe a transgenic mouse line expressing CreERT2 from the Aristaless-like 4 (Alx4) promoter that induces recombination in the anterior limb. Cre induction at embryonic day 8.5 revealed that Alx4-CreERT2 labeled cells using the mTmG Cre reporter contributed to anterior digits I to III as well as the radius of the forelimb. Cre activity is expanded further along the AP axis in the hindlimb than in the forelimb resulting in some Cre reporter cells contributing to digit IV. Induction at later time points labeled cells that become progressively restricted to more anterior digits and proximal structures. Comparison of Cre expression from the Alx4 promoter transgene with endogenous Alx4 expression reveals Cre expression is slightly expanded posteriorly relative to the endogenous Alx4 expression. Using Alx4-CreERT2 to induce loss of intraflagellar transport 88 (Ift88), a gene required for ciliogenesis, hedgehog signaling, and limb patterning, did not cause overt skeletal malformations. However, the efficiency of deletion, time needed for Ift88 protein turnover, and for cilia to regress may hinder using this approach to analyze cilia in the limb. Alx4-CreERT2 is also active in the mesonephros and nephric duct that contribute to the collecting tubules and ducts of the adult nephron. Embryonic activation of the Alx4-CreERT2 in the Ift88 conditional line results in cyst formation in the collecting tubules/ducts. CONCLUSION Overall, the Alx4-CreERT2 line will be a new tool to assess cell fates and analyze gene function in the anterior limb, mesonephros, and nephric duct.
Collapse
Affiliation(s)
- Devan M Rockwell
- Department of Cell, Development, and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Amber K O'Connor
- Department of Cell, Development, and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA.,O'Neal Comprehensive Cancer Center, University of Alabama at Birmingham Medical School, Birmingham, Alabama, USA
| | - Melissa R Bentley-Ford
- Department of Cell, Development, and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Courtney J Haycraft
- Department of Cell, Development, and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Mandy J Croyle
- Department of Cell, Development, and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Kathryn M Brewer
- Department of Biology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana, USA
| | - Nicolas F Berbari
- Department of Biology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana, USA
| | - Robert A Kesterson
- Department of Genetics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Bradley K Yoder
- Department of Cell, Development, and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| |
Collapse
|
25
|
Kopinke D, Norris AM, Mukhopadhyay S. Developmental and regenerative paradigms of cilia regulated hedgehog signaling. Semin Cell Dev Biol 2021; 110:89-103. [PMID: 32540122 PMCID: PMC7736055 DOI: 10.1016/j.semcdb.2020.05.029] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 05/25/2020] [Accepted: 05/29/2020] [Indexed: 01/08/2023]
Abstract
Primary cilia are immotile appendages that have evolved to receive and interpret a variety of different extracellular cues. Cilia play crucial roles in intercellular communication during development and defects in cilia affect multiple tissues accounting for a heterogeneous group of human diseases called ciliopathies. The Hedgehog (Hh) signaling pathway is one of these cues and displays a unique and symbiotic relationship with cilia. Not only does Hh signaling require cilia for its function but the majority of the Hh signaling machinery is physically located within the cilium-centrosome complex. More specifically, cilia are required for both repressing and activating Hh signaling by modifying bifunctional Gli transcription factors into repressors or activators. Defects in balancing, interpreting or establishing these repressor/activator gradients in Hh signaling either require cilia or phenocopy disruption of cilia. Here, we will summarize the current knowledge on how spatiotemporal control of the molecular machinery of the cilium allows for a tight control of basal repression and activation states of the Hh pathway. We will then discuss several paradigms on how cilia influence Hh pathway activity in tissue morphogenesis during development. Last, we will touch on how cilia and Hh signaling are being reactivated and repurposed during adult tissue regeneration. More specifically, we will focus on mesenchymal stem cells within the connective tissue and discuss the similarities and differences of how cilia and ciliary Hh signaling control the formation of fibrotic scar and adipose tissue during fatty fibrosis of several tissues.
Collapse
Affiliation(s)
- Daniel Kopinke
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL 32610, USA.
| | - Alessandra M Norris
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL 32610, USA
| | - Saikat Mukhopadhyay
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
| |
Collapse
|
26
|
Somatilaka BN, Hwang SH, Palicharla VR, White KA, Badgandi H, Shelton JM, Mukhopadhyay S. Ankmy2 Prevents Smoothened-Independent Hyperactivation of the Hedgehog Pathway via Cilia-Regulated Adenylyl Cyclase Signaling. Dev Cell 2020; 54:710-726.e8. [PMID: 32702291 PMCID: PMC9042708 DOI: 10.1016/j.devcel.2020.06.034] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 04/12/2020] [Accepted: 06/26/2020] [Indexed: 12/21/2022]
Abstract
The mechanisms underlying subcellular targeting of cAMP-generating adenylyl cyclases and processes regulated by their compartmentalization are poorly understood. Here, we identify Ankmy2 as a repressor of the Hedgehog pathway via adenylyl cyclase targeting. Ankmy2 binds to multiple adenylyl cyclases, determining their maturation and trafficking to primary cilia. Mice lacking Ankmy2 are mid-embryonic lethal. Knockout embryos have increased Hedgehog signaling and completely open neural tubes showing co-expansion of all ventral neuroprogenitor markers, comparable to the loss of the Hedgehog receptor Patched1. Ventralization in Ankmy2 knockout is completely independent of the Hedgehog pathway transducer Smoothened. Instead, ventralization results from the reduced formation of Gli2 and Gli3 repressors and early depletion of adenylyl cyclase III in neuroepithelial cilia, implicating deficient pathway repression. Ventralization in Ankmy2 knockout requires both cilia and Gli2 activation. These findings indicate that cilia-dependent adenylyl cyclase signaling represses the Hedgehog pathway and promotes morphogenetic patterning.
Collapse
Affiliation(s)
| | - Sun-Hee Hwang
- Department of Cell Biology, Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Vivek Reddy Palicharla
- Department of Cell Biology, Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Kevin Andrew White
- Department of Cell Biology, Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Hemant Badgandi
- Department of Cell Biology, Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - John Michael Shelton
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Saikat Mukhopadhyay
- Department of Cell Biology, Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
| |
Collapse
|
27
|
Cassidy H, Slyne J, Higgins M, Radford R, Conlon PJ, Watson AJ, Ryan MP, McMorrow T, Slattery C. Neutrophil gelatinase-associated lipocalin (NGAL) is localised to the primary cilium in renal tubular epithelial cells - A novel source of urinary biomarkers of renal injury. Biochim Biophys Acta Mol Basis Dis 2019; 1865:165532. [PMID: 31422117 DOI: 10.1016/j.bbadis.2019.165532] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 07/19/2019] [Accepted: 08/09/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Primary cilia have been shown to play a central role in regulating epithelial cell differentiation during injury and repair. Growing evidence implicates structural and functional abnormalities of primary cilia in kidney epithelial cells in the onset and development of various kidney diseases including polycystic kidney disease (PKD). Neutrophil-gelatinase associated lipocalin (NGAL) has been identified as a reliable urinary biomarker of kidney injury. However, the mechanism by which this protein accumulates in patient urine samples has not been fully elucidated. METHODS Human renal tubular epithelial cells (RPTECs) were exposed to previously characterized deciliating agents to assess mechanisms of primary cilium loss. Confocal immunofluorescent imaging was employed to visualise the effects on cilia. Western blot analysis was utilised to quantify the ciliary protein Arl13b in both RPTEC whole cell lysates and supernatants. Co-immunoprecipitation was used to demonstrate co-localisation of Arl13b and NGAL in urinary samples from a clinical Chronic Allograft Nephropathy (CAN) cohort. RESULTS Immunofluorescent analysis revealed that NGAL was localised to the primary cilium in RPTECs, co-localizing with a ciliary specific protein, Arl13b. Deciliation experiments showed that loss of the cilia coincided with loss of NGAL from the cells. CONCLUSION The accumulation of NGAL in supernatants in vitro and in the urine of CAN patients was concurrent with loss of Arl13b, a specific ciliary protein. The findings of this study propose that increased NGAL urinary concentrations are directly linked to deciliation of the renal epithelial cells as a result of injury.
Collapse
Affiliation(s)
- Hilary Cassidy
- UCD Centre for Toxicology, School of Biomolecular and Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland; Systems Biology Ireland, School of Medicine, University College Dublin, Belfield, Dublin 4, Ireland
| | - Jennifer Slyne
- UCD Centre for Toxicology, School of Biomolecular and Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
| | - Michael Higgins
- UCD Centre for Toxicology, School of Biomolecular and Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
| | - Robert Radford
- Molecular and Cell Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California, United States of America
| | - Peter J Conlon
- Department of Nephrology & Transplantation, Beaumont Hospital, Beaumont, Dublin, Ireland
| | - Alan J Watson
- Department of Nephrology, St. Vincent's Hospital, Elm Park, Dublin 4, Ireland; School of Medicine and Medicinal Sciences, University College Dublin, Belfield, Dublin 4, Ireland
| | - Michael P Ryan
- UCD Centre for Toxicology, School of Biomolecular and Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
| | - Tara McMorrow
- UCD Centre for Toxicology, School of Biomolecular and Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
| | - Craig Slattery
- UCD Centre for Toxicology, School of Biomolecular and Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland.
| |
Collapse
|
28
|
Nakaniwa M, Kawasaki M, Kawasaki K, Yamada A, Meguro F, Takeyasu M, Ohazama A. Primary cilia in murine palatal rugae development. Gene Expr Patterns 2019; 34:119062. [PMID: 31226309 DOI: 10.1016/j.gep.2019.119062] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 06/17/2019] [Accepted: 06/17/2019] [Indexed: 10/26/2022]
Abstract
Periodic patterning of iterative structures is a fundamental process during embryonic development, since these structures are diverse across the animal kingdom. Therefore, elucidating the molecular mechanisms in the formation of these structures promotes understanding of the process of organogenesis. Periodically patterned ridges, palatal rugae (situated on the hard palate of mammals), are an excellent experimental model to clarify the molecular mechanisms involved in the formation of periodic patterning of iterative structures. Primary cilia are involved in many biological events, including the regulation of signaling pathways such as Shh and non-canonical Wnt signaling. However, the role of primary cilia in the development of palatal rugae remains unclear. We found that primary cilia were localized to the oral cavity side of the interplacode epithelium of the palatal rugae, whereas restricted localization of primary cilia could not be detected in other regions. Next, we generated mice with a placodal conditional deletion of the primary cilia protein Ift88, using ShhCre mice (Ift88 fl/fl;ShhCre). Highly disorganized palatal rugae were observed in Ift88 fl/fl;ShhCre mice. Furthermore, by comparative in situ hybridization analysis, many Shh and non-canonical Wnt signaling-related molecules showed spatiotemporal expression patterns during palatal rugae development, including restricted expression in the epithelium (placodes and interplacodes) and mesenchyme. Some of these expression were found to be altered in Ift88 fl/fl;ShhCre mice. Primary cilia is thus involved in development of palatal rugae.
Collapse
Affiliation(s)
- Mayuko Nakaniwa
- Division of Oral Anatomy, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Maiko Kawasaki
- Division of Oral Anatomy, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Katsushige Kawasaki
- Division of Oral Anatomy, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Research Center for Advanced Oral Science, Department of Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Akane Yamada
- Division of Oral Anatomy, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Fumiya Meguro
- Division of Oral Anatomy, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Maeda Takeyasu
- Research Center for Advanced Oral Science, Department of Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Faculty of Dental Medicine, University of Airlangga, Surabaya, Indonesia
| | - Atsushi Ohazama
- Division of Oral Anatomy, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
| |
Collapse
|
29
|
King A, Hoch NC, McGregor NE, Sims NA, Smyth IM, Heierhorst J. Dynll1 is essential for development and promotes endochondral bone formation by regulating intraflagellar dynein function in primary cilia. Hum Mol Genet 2019; 28:2573-2588. [DOI: 10.1093/hmg/ddz083] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 03/18/2019] [Accepted: 04/15/2019] [Indexed: 01/15/2023] Open
Abstract
AbstractMutations in subunits of the cilia-specific cytoplasmic dynein-2 (CD2) complex cause short-rib thoracic dystrophy syndromes (SRTDs), characterized by impaired bone growth and life-threatening perinatal respiratory complications. Different SRTD mutations result in varying disease severities. It remains unresolved whether this reflects the extent of retained hypomorphic protein functions or relative importance of the affected subunits for the activity of the CD2 holoenzyme. To define the contribution of the LC8-type dynein light chain subunit to the CD2 complex, we have generated Dynll1-deficient mouse strains, including the first-ever conditional knockout (KO) mutant for any CD2 subunit. Germline Dynll1 KO mice exhibit a severe ciliopathy-like phenotype similar to mice lacking another CD2 subunit, Dync2li1. Limb mesoderm-specific loss of Dynll1 results in severe bone shortening similar to human SRTD patients. Mechanistically, loss of Dynll1 leads to a partial depletion of other SRTD-related CD2 subunits, severely impaired retrograde intra-flagellar transport, significant thickening of primary cilia and cilia signaling defects. Interestingly, phenotypes of Dynll1-deficient mice are very similar to entirely cilia-deficient Kif3a/Ift88-null mice, except that they never present with polydactyly and retain relatively higher signaling outputs in parts of the hedgehog pathway. Compared to complete loss of Dynll1, maintaining very low DYNLL1 levels in mice lacking the Dynll1-transcription factor ASCIZ (ATMIN) results in significantly attenuated phenotypes and improved CD2 protein levels. The results suggest that primary cilia can maintain some functionality in the absence of intact CD2 complexes and provide a viable animal model for the analysis of the underlying bone development defects of SRTDs.
Collapse
Affiliation(s)
- Ashleigh King
- St. Vincent’s Institute of Medical Research
- Department of Medicine at St. Vincent’s Hospital, Melbourne Medical School, The University of Melbourne, Fitzroy, Victoria, Australia
| | | | | | - Natalie A Sims
- St. Vincent’s Institute of Medical Research
- Department of Medicine at St. Vincent’s Hospital, Melbourne Medical School, The University of Melbourne, Fitzroy, Victoria, Australia
| | - Ian M Smyth
- Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Jörg Heierhorst
- St. Vincent’s Institute of Medical Research
- Department of Medicine at St. Vincent’s Hospital, Melbourne Medical School, The University of Melbourne, Fitzroy, Victoria, Australia
| |
Collapse
|
30
|
Wang Y, Zeng H, Liu A. Distinct Activities of Gli1 and Gli2 in the Absence of Ift88 and the Primary Cilia. J Dev Biol 2019; 7:jdb7010005. [PMID: 30791390 PMCID: PMC6473256 DOI: 10.3390/jdb7010005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 02/13/2019] [Accepted: 02/16/2019] [Indexed: 12/26/2022] Open
Abstract
The primary cilia play essential roles in Hh-dependent Gli2 activation and Gli3 proteolytic processing in mammals. However, the roles of the cilia in Gli1 activation remain unresolved due to the loss of Gli1 transcription in cilia mutant embryos, and the inability to address this question by overexpression in cultured cells. Here, we address the roles of the cilia in Gli1 activation by expressing Gli1 from the Gli2 locus in mouse embryos. We find that the maximal activation of Gli1 depends on the cilia, but partial activation of Gli1 by Smo-mediated Hh signaling exists in the absence of the cilia. Combined with reduced Gli3 repressors, this partial activation of Gli1 leads to dorsal expansion of V3 interneuron and motor neuron domains in the absence of the cilia. Moreover, expressing Gli1 from the Gli2 locus in the presence of reduced Sufu has no recognizable impact on neural tube patterning, suggesting an imbalance between the dosages of Gli and Sufu does not explain the extra Gli1 activity. Finally, a non-ciliary Gli2 variant present at a higher level than Gli1 when expressed from the Gli2 locus fails to activate Hh pathway ectopically in the absence of the cilia, suggesting that increased protein level is unlikely the major factor underlying the ectopic activation of Hh signaling by Gli1 in the absence of the cilia.
Collapse
Affiliation(s)
- Yuan Wang
- Department of Biology, Eberly College of Sciences, Center for Cellular Dynamics, Huck Institute of Life Science, The Penn State University, University Park, PA 16802, USA.
- Department of Occupational Health, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang 110122, China.
| | - Huiqing Zeng
- Department of Biology, Eberly College of Sciences, Center for Cellular Dynamics, Huck Institute of Life Science, The Penn State University, University Park, PA 16802, USA.
| | - Aimin Liu
- Department of Biology, Eberly College of Sciences, Center for Cellular Dynamics, Huck Institute of Life Science, The Penn State University, University Park, PA 16802, USA.
| |
Collapse
|
31
|
Chekuri A, Guru AA, Biswas P, Branham K, Borooah S, Soto-Hermida A, Hicks M, Khan NW, Matsui H, Alapati A, Raghavendra PB, Roosing S, Sarangapani S, Mathavan S, Telenti A, Heckenlively JR, Riazuddin SA, Frazer KA, Sieving PA, Ayyagari R. IFT88 mutations identified in individuals with non-syndromic recessive retinal degeneration result in abnormal ciliogenesis. Hum Genet 2018; 137:447-458. [PMID: 29978320 DOI: 10.1007/s00439-018-1897-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 06/21/2018] [Indexed: 12/26/2022]
Abstract
Whole genome sequencing (WGS) was performed to identify the variants responsible for inherited retinal degeneration (IRD) in a Caucasian family. Segregation analysis of selected rare variants with pathogenic potential identified a set of compound heterozygous changes p.Arg266*:c.796C>T and p.Ala568Thr:c.1702G>A in the intraflagellar transport protein-88 (IFT88) gene segregating with IRD. Expression of IFT88 with the p.Arg266* and p.Ala568Thr mutations in mIMDC3 cells by transient transfection and in HeLa cells by introducing the mutations using CRISPR-cas9 system suggested that both mutations result in the formation of abnormal ciliary structures. The introduction of the IFT88 p.Arg266* variant in the homozygous state in HeLa cells by CRISPR-Cas9 genome-editing revealed that the mutant transcript undergoes nonsense-mediated decay leading to a significant depletion of IFT88 transcript. Additionally, abnormal ciliogenesis was observed in these cells. These observations suggest that the rare and unique combination of IFT88 alleles observed in this study provide insight into the physiological role of IFT88 in humans and the likely mechanism underlying retinal pathology in the pedigree with IRD.
Collapse
Affiliation(s)
- Anil Chekuri
- Shiley Eye Institute, University of California San Diego, 9415 Campus Point Drive, JRC 206, La Jolla, CA, 92093, USA
| | - Aditya A Guru
- Shiley Eye Institute, University of California San Diego, 9415 Campus Point Drive, JRC 206, La Jolla, CA, 92093, USA
| | - Pooja Biswas
- Shiley Eye Institute, University of California San Diego, 9415 Campus Point Drive, JRC 206, La Jolla, CA, 92093, USA.,School of Biotechnology, REVA University, Bengaluru, Karnataka, India
| | - Kari Branham
- Ophthalmology and Visual Science, University of Michigan Kellogg Eye Center, Ann Arbor, MI, USA
| | - Shyamanga Borooah
- Shiley Eye Institute, University of California San Diego, 9415 Campus Point Drive, JRC 206, La Jolla, CA, 92093, USA
| | - Angel Soto-Hermida
- Shiley Eye Institute, University of California San Diego, 9415 Campus Point Drive, JRC 206, La Jolla, CA, 92093, USA
| | | | - Naheed W Khan
- Ophthalmology and Visual Science, University of Michigan Kellogg Eye Center, Ann Arbor, MI, USA
| | - Hiroko Matsui
- Institute for Genomic Medicine, University of California San Diego, La Jolla, CA, USA
| | - Akhila Alapati
- Shiley Eye Institute, University of California San Diego, 9415 Campus Point Drive, JRC 206, La Jolla, CA, 92093, USA
| | - Pongali B Raghavendra
- School of Biotechnology, REVA University, Bengaluru, Karnataka, India.,School of Regenerative Medicine, Manipal University-MAHE, Bangalore, India
| | - Susanne Roosing
- Department of Human Genetics, Radboud University Nijmegen Medical Center, PO Box 9101, 6500 HB, Nijmegen, The Netherlands
| | | | | | | | - John R Heckenlively
- Ophthalmology and Visual Science, University of Michigan Kellogg Eye Center, Ann Arbor, MI, USA
| | - S Amer Riazuddin
- The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Kelly A Frazer
- Institute for Genomic Medicine, University of California San Diego, La Jolla, CA, USA.,Division of Genome Information Sciences, Department of Pediatrics, Rady Children's Hospital, San Diego, CA, USA
| | - Paul A Sieving
- National Eye Institute, National Institutes of Health, Bethesda, MD, USA
| | - Radha Ayyagari
- Shiley Eye Institute, University of California San Diego, 9415 Campus Point Drive, JRC 206, La Jolla, CA, 92093, USA.
| |
Collapse
|
32
|
Carli JFM, LeDuc CA, Zhang Y, Stratigopoulos G, Leibel RL. The role of Rpgrip1l, a component of the primary cilium, in adipocyte development and function. FASEB J 2018; 32:3946-3956. [PMID: 29466054 DOI: 10.1096/fj.201701216r] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Genetic variants within the FTO (α-ketoglutarate-dependent dioxygenase) gene have been strongly associated with a modest increase in adiposity as a result of increased food intake. These risk alleles are associated with decreased expression of both FTO and neighboring RPGRIP1L (retinitis pigmentosa GTPase regulator-interacting protein 1 like). RPGRIP1L encodes a protein that is critical to the function of the primary cilium, which conveys extracellular information to the cell. Rpgrip1l+/- mice exhibit increased adiposity, in part, as a result of hyperphagia. Here, we describe the effects of Rpgrip1l in adipocytes that may contribute to the adiposity phenotype observed in these animals and possibly in humans who segregate for FTO risk alleles. Loss of Rpgrip1l in 3T3-L1 preadipocytes increased the number of cells that are capable of differentiating into mature adipocytes. Knockout of Rpgrip1l in mature adipocytes using Adipoq-Cre did not increase adiposity in mice that were fed chow or a high-fat diet. We also did not observe any effects of Rpgrip1l knockdown in mature 3T3-L1 adipocytes. Thus, to the extent that Rpgrip1l affects cell-autonomous adipose tissue function, it may do so as a result of the effects conveyed in preadipocytes in which the primary cilium is functionally important. We propose that decreased RPGRIP1L expression in preadipocytes in humans who segregate for FTO obesity risk alleles may increase the storage capacity of adipose tissue.-Martin Carli, J. F., LeDuc, C. A., Zhang, Y., Stratigopoulos, G., Leibel, R. L. The role of Rpgrip1l, a component of the primary cilium, in adipocyte development and function.
Collapse
Affiliation(s)
- Jayne F Martin Carli
- Department of Biochemistry and Molecular Biophysics, Columbia University Medical Center, New York, New York, USA.,Naomi Berrie Diabetes Center, Columbia University Medical Center, New York, New York, USA.,Department of Pediatrics, Columbia University Medical Center, New York, New York, USA
| | - Charles A LeDuc
- Naomi Berrie Diabetes Center, Columbia University Medical Center, New York, New York, USA.,Department of Pediatrics, Columbia University Medical Center, New York, New York, USA
| | - Yiying Zhang
- Naomi Berrie Diabetes Center, Columbia University Medical Center, New York, New York, USA.,Department of Pediatrics, Columbia University Medical Center, New York, New York, USA
| | - George Stratigopoulos
- Naomi Berrie Diabetes Center, Columbia University Medical Center, New York, New York, USA.,Department of Pediatrics, Columbia University Medical Center, New York, New York, USA
| | - Rudolph L Leibel
- Naomi Berrie Diabetes Center, Columbia University Medical Center, New York, New York, USA.,Department of Pediatrics, Columbia University Medical Center, New York, New York, USA
| |
Collapse
|
33
|
Abstract
Despite therapeutic advances that have prolonged life, myocardial infarction (MI) remains a leading cause of death worldwide and imparts a significant economic burden. The advancement of treatments to improve cardiac repair post-MI requires the discovery of new targeted treatment strategies. Recent studies have highlighted the importance of the epicardial covering of the heart in both cardiac development and lower vertebrate cardiac regeneration. The epicardium serves as a source of cardiac cells including smooth muscle cells, endothelial cells and cardiac fibroblasts. Mammalian adult epicardial cells are typically quiescent. However, the fetal genetic program is reactivated post-MI, and epicardial epithelial-to-mesenchymal transition (EMT) occurs as an inherent mechanism to support neovascularization and cardiac healing. Unfortunately, endogenous EMT is not enough to encourage sufficient repair. Recent developments in our understanding of the mechanisms supporting the EMT process has led to a number of studies directed at augmenting epicardial EMT post-MI. With a focus on the role of the primary cilium, this review outlines the newly demonstrated mechanisms supporting EMT, the role of epicardial EMT in cardiac development, and promising advances in augmenting epicardial EMT as potential therapeutics to support cardiac repair post-MI.
Collapse
|
34
|
Abstract
Cilia are microtubule-based organelles extending from a basal body at the surface of eukaryotic cells. Cilia regulate cell and fluid motility, sensation and developmental signaling, and ciliary defects cause human diseases (ciliopathies) affecting the formation and function of many tissues and organs. Over the past decade, various Rab and Rab-like membrane trafficking proteins have been shown to regulate cilia-related processes such as basal body maturation, ciliary axoneme extension, intraflagellar transport and ciliary signaling. In this review, we provide a comprehensive overview of Rab protein ciliary associations, drawing on findings from multiple model systems, including mammalian cell culture, mice, zebrafish, C. elegans, trypanosomes, and green algae. We also discuss several emerging mechanistic themes related to ciliary Rab cascades and functional redundancy.
Collapse
Affiliation(s)
- Oliver E Blacque
- a School of Biomolecular and Biomedical Science , University College Dublin , Belfield, Dublin , Ireland
| | - Noemie Scheidel
- a School of Biomolecular and Biomedical Science , University College Dublin , Belfield, Dublin , Ireland
| | - Stefanie Kuhns
- a School of Biomolecular and Biomedical Science , University College Dublin , Belfield, Dublin , Ireland
| |
Collapse
|
35
|
Mitchison HM, Shoemark A. Motile cilia defects in diseases other than primary ciliary dyskinesia: The contemporary diagnostic and research role for transmission electron microscopy. Ultrastruct Pathol 2017; 41:415-427. [PMID: 28925789 DOI: 10.1080/01913123.2017.1370050] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Ultrastructural studies have underpinned the cell biological and clinical investigations of the varied roles of motile cilia in health and disease, with a long history since the 1950s. Recent developments from transmission electron microscopy (TEM; cryo-electron microscopy, electron tomography) have yielded higher resolution and fresh insights into the structure and function of these complex organelles. Microscopy in ciliated organisms, disease models, and in patients with ciliopathy diseases has dramatically expanded our understanding of the ubiquity, multisystem involvement, and importance of cilia in normal human development. Here, we review the importance of motile cilia ultrastructural studies in understanding the basis of diseases other than primary ciliary dyskinesia.
Collapse
Affiliation(s)
- Hannah M Mitchison
- a Newlife Birth Defects Research Centre, Experimental and Personalised Medicine, Genetics and Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health , University College London , London , UK
| | - Amelia Shoemark
- b Department of Paediatric Respiratory Medicine , Royal Brompton & Harefield NHS Trust , London , UK.,c Division of Molecular & Clinical Medicine, School of Medicine , Ninewells Hospital and Medical School , Dundee , UK
| |
Collapse
|
36
|
Christensen ST, Morthorst SK, Mogensen JB, Pedersen LB. Primary Cilia and Coordination of Receptor Tyrosine Kinase (RTK) and Transforming Growth Factor β (TGF-β) Signaling. Cold Spring Harb Perspect Biol 2017; 9:cshperspect.a028167. [PMID: 27638178 DOI: 10.1101/cshperspect.a028167] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Since the beginning of the millennium, research in primary cilia has revolutionized our way of understanding how cells integrate and organize diverse signaling pathways during vertebrate development and in tissue homeostasis. Primary cilia are unique sensory organelles that detect changes in their extracellular environment and integrate and transmit signaling information to the cell to regulate various cellular, developmental, and physiological processes. Many different signaling pathways have now been shown to rely on primary cilia to function properly, and mutations that lead to ciliary dysfunction are at the root of a pleiotropic group of diseases and syndromic disorders called ciliopathies. In this review, we present an overview of primary cilia-mediated regulation of receptor tyrosine kinase (RTK) and transforming growth factor β (TGF-β) signaling. Further, we discuss how defects in the coordination of these pathways may be linked to ciliopathies.
Collapse
Affiliation(s)
- Søren T Christensen
- Department of Biology, University of Copenhagen, DK-2100 Copenhagen OE, Denmark
| | - Stine K Morthorst
- Department of Biology, University of Copenhagen, DK-2100 Copenhagen OE, Denmark
| | - Johanne B Mogensen
- Department of Biology, University of Copenhagen, DK-2100 Copenhagen OE, Denmark
| | - Lotte B Pedersen
- Department of Biology, University of Copenhagen, DK-2100 Copenhagen OE, Denmark
| |
Collapse
|
37
|
Davis A, Amin NM, Johnson C, Bagley K, Ghashghaei HT, Nascone-Yoder N. Stomach curvature is generated by left-right asymmetric gut morphogenesis. Development 2017; 144:1477-1483. [PMID: 28242610 PMCID: PMC5399665 DOI: 10.1242/dev.143701] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 02/21/2017] [Indexed: 01/09/2023]
Abstract
Left-right (LR) asymmetry is a fundamental feature of internal anatomy, yet the emergence of morphological asymmetry remains one of the least understood phases of organogenesis. Asymmetric rotation of the intestine is directed by forces outside the gut, but the morphogenetic events that generate anatomical asymmetry in other regions of the digestive tract remain unknown. Here, we show in mouse and Xenopus that the mechanisms that drive the curvature of the stomach are intrinsic to the gut tube itself. The left wall of the primitive stomach expands more than the right wall, as the left epithelium becomes more polarized and undergoes radial rearrangement. These asymmetries exist across several species, and are dependent on LR patterning genes, including Foxj1, Nodal and Pitx2 Our findings have implications for how LR patterning manifests distinct types of morphological asymmetries in different contexts.
Collapse
Affiliation(s)
- Adam Davis
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Nirav M Amin
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Caroline Johnson
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Kristen Bagley
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - H Troy Ghashghaei
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Nanette Nascone-Yoder
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| |
Collapse
|
38
|
Serwas D, Su TY, Roessler M, Wang S, Dammermann A. Centrioles initiate cilia assembly but are dispensable for maturation and maintenance in C. elegans. J Cell Biol 2017; 216:1659-1671. [PMID: 28411189 PMCID: PMC5461022 DOI: 10.1083/jcb.201610070] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 03/10/2017] [Accepted: 04/10/2017] [Indexed: 01/17/2023] Open
Abstract
Cilia are cellular projections that assemble on centriole-derived basal bodies. While cilia assembly is absolutely dependent on centrioles, it is not known to what extent they contribute to downstream events. The nematode C. elegans provides a unique opportunity to address this question, as centrioles do not persist at the base of mature cilia. Using fluorescence microscopy and electron tomography, we find that centrioles degenerate early during ciliogenesis. The transition zone and axoneme are not completely formed at this time, indicating that cilia maturation does not depend on intact centrioles. The hydrolethalus syndrome protein HYLS-1 is the only centriolar protein known to remain at the base of mature cilia and is required for intraflagellar transport trafficking. Surprisingly, targeted degradation of HYLS-1 after initiation of ciliogenesis does not affect ciliary structures. Taken together, our results indicate that while centrioles are essential to initiate cilia formation, they are dispensable for cilia maturation and maintenance.
Collapse
Affiliation(s)
- Daniel Serwas
- Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter (VBC), A-1030 Vienna, Austria
| | - Tiffany Y Su
- Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter (VBC), A-1030 Vienna, Austria
| | - Max Roessler
- Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter (VBC), A-1030 Vienna, Austria
| | - Shaohe Wang
- Ludwig Institute for Cancer Research, Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093
| | - Alexander Dammermann
- Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter (VBC), A-1030 Vienna, Austria
| |
Collapse
|
39
|
Abstract
This is a history of cilia research before and after the discovery of intraflagellar transport (IFT) and the link between primary cilia ciliogenesis and polycystic kidney disease (PKD). Before IFT, ca. the beginning of the new millennium, although sensory and primary cilia were well described, research was largely focused on motile cilia, their structure, movement, and biogenesis. After IFT and the link to PKD, although work on motile cilia has continued to progress, research on primary cilia has exploded, leading to new insights into the role of cilia in cell signaling and development. Genomics, proteomics, and new imaging techniques have unified the field and pointed out the critical role of cilia as a restricted cell organellar compartment, functionally integrated with other cell organelles including the autophagosome and the nucleus.
Collapse
Affiliation(s)
- Peter Satir
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY USA
| |
Collapse
|
40
|
Abstract
Leftward fluid flow in the mouse node is generated by cilia and is critical for initiating asymmetry of the left-right axis. Coiled-coil domain containing-40 (Ccdc40) plays an evolutionarily conserved role in the assembly of motile cilia and establishment of the left-right axis. Approximately one-third of Ccdc40lnks mutant embryos display situs defects and here we investigate the underlying mechanism. Ccdc40lnks mutants show delayed induction of markers of the left-lateral plate mesoderm (L-LPM) including Lefty1, Lefty2 and Nodal. Consistent with defective cilia motility compromising fluid flow across the node, initiation of asymmetric perinodal Cerberus like-2 (Cerl2) expression is delayed and then randomized. This is followed by delayed and then randomized asymmetric Nodal expression around the node. We propose a model to explain how left isomerism arises in a proportion of Ccdc40lnks mutants. We postulate that with defective motile cilia, Cerl2 expression remains symmetric and Nodal is antagonized equally on both sides of the node. This effectively reduces Nodal activation bilaterally, leading to reduced and delayed activation of Nodal and its antagonists in the LPM. This model is further supported by the failure to establish Nodal expression in the left-LPM with reduced Nodal gene dosage in Ccdc40lnks/lnks;NodalLacZ/+ mutants causing a predominance of right not left isomerism. Together these results suggest a model where cilia generated fluid flow in the node functions to ensure robust Nodal activation and a timely left-sided developmental program in the LPM.
Collapse
|
41
|
Cornils A, Maurya AK, Tereshko L, Kennedy J, Brear AG, Prahlad V, Blacque OE, Sengupta P. Structural and Functional Recovery of Sensory Cilia in C. elegans IFT Mutants upon Aging. PLoS Genet 2016; 12:e1006325. [PMID: 27906968 PMCID: PMC5131903 DOI: 10.1371/journal.pgen.1006325] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 08/25/2016] [Indexed: 01/28/2023] Open
Abstract
The majority of cilia are formed and maintained by the highly conserved process of intraflagellar transport (IFT). Mutations in IFT genes lead to ciliary structural defects and systemic disorders termed ciliopathies. Here we show that the severely truncated sensory cilia of hypomorphic IFT mutants in C. elegans transiently elongate during a discrete period of adult aging leading to markedly improved sensory behaviors. Age-dependent restoration of cilia morphology occurs in structurally diverse cilia types and requires IFT. We demonstrate that while DAF-16/FOXO is dispensable, the age-dependent suppression of cilia phenotypes in IFT mutants requires cell-autonomous functions of the HSF1 heat shock factor and the Hsp90 chaperone. Our results describe an unexpected role of early aging and protein quality control mechanisms in suppressing ciliary phenotypes of IFT mutants, and suggest possible strategies for targeting subsets of ciliopathies. Cilia are ‘antenna-like’ structures that are present on nearly all cell types in animals. These structures are important for sensing and signaling external cues to the cell. Most cilia are formed by a protein transport process called ‘intraflagellar transport’ or IFT. Mutations in IFT genes result in severe cilia defects, and are causal to a large number of diverse human disorders called ciliopathies. Since the genes and processes by which cilia are formed are similar across species, studies in experimental models such as the nematode C. elegans can greatly inform our overall understanding of cilia formation and function. Here we report the surprising observation that the structures and functions of severely defective cilia in nematodes with disrupted IFT genes markedly improve upon aging. We find that protein quality control mechanisms that normally decline in aging are required for this age-dependent recovery of cilia structure. Our results raise the possibility that the effects of some mutations in IFT genes can be bypassed under specific conditions, thereby restoring cilia functions.
Collapse
Affiliation(s)
- Astrid Cornils
- Department of Biology and National Center for Behavioral Genomics, Brandeis University, Waltham, Massachusetts
| | - Ashish K. Maurya
- Department of Biology and National Center for Behavioral Genomics, Brandeis University, Waltham, Massachusetts
| | - Lauren Tereshko
- Department of Biology and National Center for Behavioral Genomics, Brandeis University, Waltham, Massachusetts
| | - Julie Kennedy
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Dublin, Ireland
| | - Andrea G. Brear
- Department of Biology and National Center for Behavioral Genomics, Brandeis University, Waltham, Massachusetts
| | - Veena Prahlad
- Department of Biology, Aging Mind and Brain Initiative, University of Iowa, Iowa City, Iowa
| | - Oliver E. Blacque
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Dublin, Ireland
| | - Piali Sengupta
- Department of Biology and National Center for Behavioral Genomics, Brandeis University, Waltham, Massachusetts
- * E-mail:
| |
Collapse
|
42
|
Kleene SJ, Kleene NK. The native TRPP2-dependent channel of murine renal primary cilia. Am J Physiol Renal Physiol 2016; 312:F96-F108. [PMID: 27760766 DOI: 10.1152/ajprenal.00272.2016] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 09/22/2016] [Accepted: 10/13/2016] [Indexed: 12/19/2022] Open
Abstract
Autosomal dominant polycystic kidney disease (ADPKD) is the most common life-threatening monogenic renal disease. ADPKD results from mutations in either of two proteins: polycystin-1 (also known as PC1 or PKD1) or transient receptor potential cation channel, subfamily P, member 2 (TRPP2, also known as polycystin-2, PC2, or PKD2). Each of these proteins is expressed in the primary cilium that extends from many renal epithelial cells. Existing evidence suggests that the cilium can promote renal cystogenesis, while PC1 and TRPP2 counter this cystogenic effect. To better understand the function of TRPP2, we investigated its electrophysiological properties in the native ciliary membrane. We recorded directly from the cilia of mIMCD-3 cells, a murine cell line of renal epithelial origin. In one-third of cilia examined, a large-conductance channel was observed. The channel was not permeable to Cl¯ but conducted cations with permeability ratios PK:PCa:PNa of 1:0.55:0.14. The single-channel conductance ranged from 97 pS in typical physiological solutions to 189 pS in symmetrical 145 mM KCl. Open probability of the channel was very sensitive to membrane depolarization or increasing cytoplasmic free Ca2+ in the low micromolar range, with the open probability increasing in either case. Knocking out TRPP2 by CRISPR/Cas9 genome editing eliminated the channel current, establishing it as TRPP2 dependent. Possible mechanisms for activating the TRPP2-dependent channel in the renal primary cilium are discussed.
Collapse
Affiliation(s)
- Steven J Kleene
- Department of Molecular and Cellular Physiology, University of Cincinnati, Cincinnati, Ohio
| | - Nancy K Kleene
- Department of Molecular and Cellular Physiology, University of Cincinnati, Cincinnati, Ohio
| |
Collapse
|
43
|
Zhang Z, Li W, Zhang Y, Zhang L, Teves ME, Liu H, Strauss JF, Pazour GJ, Foster JA, Hess RA, Zhang Z. Intraflagellar transport protein IFT20 is essential for male fertility and spermiogenesis in mice. Mol Biol Cell 2016; 27:mbc.E16-05-0318. [PMID: 27682589 PMCID: PMC5170554 DOI: 10.1091/mbc.e16-05-0318] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 09/06/2016] [Accepted: 09/20/2016] [Indexed: 12/22/2022] Open
Abstract
Intraflagellar transport (IFT) is a conserved mechanism thought to be essential for the assembly and maintenance of cilia and flagella. However, little is known about its role in mammalian sperm flagella formation. To fill this gap, we disrupted the Ift20 gene in male germ cells. Homozygous mutant mice were infertile with significantly reduced sperm counts and motility. In addition, abnormally shaped elongating spermatid heads and bulbous round spermatids were found in the lumen of the seminiferous tubules. Electron microscopy revealed increased cytoplasmic vesicles, fiber-like structures, abnormal accumulation of mitochondria and a decrease in mature lysosomes. The few developed sperm had disrupted axonemes and some retained cytoplasmic lobe components on the flagella. ODF2 and SPAG16L, two sperm flagella proteins failed to be incorporated into sperm tails of the mutant mice, and in the germ cells, both were assembled into complexes with lighter density in the absence of IFT20. Disrupting IFT20 did not significantly change expression levels of IFT88, a component of IFT-B complex, and IFT140, a component of IFT-A complex. Even though the expression level of an autophagy core protein that associates with IFT20, ATG16, was reduced in the testis of the Ift20 mutant mice, expression levels of other major autophagy markers, including LC3 and ubiquitin were not changed. Our studies suggest that IFT20 is essential for male fertility and spermiogenesis in mice, and its major function is to transport cargo proteins for sperm flagella formation. It also appears to be involved in removing excess cytoplasmic components.
Collapse
Affiliation(s)
- Zhengang Zhang
- Department of Gastroenterology, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, Hubei, China, 430030 Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, VA, 23298
| | - Wei Li
- Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, VA, 23298
| | - Yong Zhang
- Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, VA, 23298 Department of Dermatology, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, Hubei, China, 430030
| | - Ling Zhang
- Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, VA, 23298 School of Public Health, Wuhan University of Science and Technology, Wuhan, Hubei, 430065
| | - Maria E Teves
- Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, VA, 23298
| | - Hong Liu
- Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, VA, 23298 School of Public Health, Wuhan University of Science and Technology, Wuhan, Hubei, 430065
| | - Jerome F Strauss
- Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, VA, 23298
| | - Gregory J Pazour
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605
| | - James A Foster
- Department of Biology, Randolph-Macon College, Ashland, VA 23005
| | - Rex A Hess
- Comparative Biosciences, College of Veterinary Medicine, University of Illinois, 2001 S. Lincoln, Urbana, IL 61802-6199
| | - Zhibing Zhang
- Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, VA, 23298
| |
Collapse
|
44
|
Jin Z, Schwend T, Fu J, Bao Z, Liang J, Zhao H, Mei W, Yang J. Members of the Rusc protein family interact with Sufu and inhibit vertebrate Hedgehog signaling. Development 2016; 143:3944-3955. [PMID: 27633991 DOI: 10.1242/dev.138917] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 09/01/2016] [Indexed: 12/20/2022]
Abstract
Hedgehog (Hh) signaling is fundamentally important for development and adult tissue homeostasis. It is well established that in vertebrates Sufu directly binds and inhibits Gli proteins, the downstream mediators of Hh signaling. However, it is unclear how the inhibitory function of Sufu towards Gli is regulated. Here we report that the Rusc family of proteins, the biological functions of which are poorly understood, form a heterotrimeric complex with Sufu and Gli. Upon Hh signaling, Rusc is displaced from this complex, followed by dissociation of Gli from Sufu. In mammalian fibroblast cells, knockdown of Rusc2 potentiates Hh signaling by accelerating signaling-induced dissociation of the Sufu-Gli protein complexes. In Xenopus embryos, knockdown of Rusc1 or overexpression of a dominant-negative Rusc enhances Hh signaling during eye development, leading to severe eye defects. Our study thus uncovers a novel regulatory mechanism controlling the response of cells to Hh signaling in vertebrates.
Collapse
Affiliation(s)
- Zhigang Jin
- Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, 2001 S Lincoln Avenue, Urbana, IL 61802, USA
| | - Tyler Schwend
- Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, 2001 S Lincoln Avenue, Urbana, IL 61802, USA
| | - Jia Fu
- Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, 2001 S Lincoln Avenue, Urbana, IL 61802, USA
| | - Zehua Bao
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Jing Liang
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Huimin Zhao
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Wenyan Mei
- Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, 2001 S Lincoln Avenue, Urbana, IL 61802, USA
| | - Jing Yang
- Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, 2001 S Lincoln Avenue, Urbana, IL 61802, USA
| |
Collapse
|
45
|
Abstract
SIGNIFICANCE Forces are important in the cardiovascular system, acting as regulators of vascular physiology and pathology. Residing at the blood vessel interface, cells (endothelial cell, EC) are constantly exposed to vascular forces, including shear stress. Shear stress is the frictional force exerted by blood flow, and its patterns differ based on vessel geometry and type. These patterns range from uniform laminar flow to nonuniform disturbed flow. Although ECs sense and differentially respond to flow patterns unique to their microenvironment, the mechanisms underlying endothelial mechanosensing remain incompletely understood. RECENT ADVANCES A large body of work suggests that ECs possess many mechanosensors that decorate their apical, junctional, and basal surfaces. These potential mechanosensors sense blood flow, translating physical force into biochemical signaling events. CRITICAL ISSUES Understanding the mechanisms by which proposed mechanosensors sense and respond to shear stress requires an integrative approach. It is also critical to understand the role of these mechanosensors not only during embryonic development but also in the different vascular beds in the adult. Possible cross talk and integration of mechanosensing via the various mechanosensors remain a challenge. FUTURE DIRECTIONS Determination of the hierarchy of endothelial mechanosensors is critical for future work, as is determination of the extent to which mechanosensors work together to achieve force-dependent signaling. The role and primary sensors of shear stress during development also remain an open question. Finally, integrative approaches must be used to determine absolute mechanosensory function of potential mechanosensors. Antioxid. Redox Signal. 25, 373-388.
Collapse
Affiliation(s)
- Chris Givens
- 1 Department of Cell Biology and Physiology, University of North Carolina-Chapel Hill , Chapel Hill, North Carolina
| | - Ellie Tzima
- 1 Department of Cell Biology and Physiology, University of North Carolina-Chapel Hill , Chapel Hill, North Carolina.,2 Cardiovascular Medicine, Wellcome Trust Centre for Human Genetics , Oxford, United Kingdom
| |
Collapse
|
46
|
Burnicka-Turek O, Steimle JD, Huang W, Felker L, Kamp A, Kweon J, Peterson M, Reeves RH, Maslen CL, Gruber PJ, Yang XH, Shendure J, Moskowitz IP. Cilia gene mutations cause atrioventricular septal defects by multiple mechanisms. Hum Mol Genet 2016; 25:3011-3028. [PMID: 27340223 DOI: 10.1093/hmg/ddw155] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 05/13/2016] [Accepted: 05/18/2016] [Indexed: 01/13/2023] Open
Abstract
Atrioventricular septal defects (AVSDs) are a common severe form of congenital heart disease (CHD). In this study we identified deleterious non-synonymous mutations in two cilia genes, Dnah11 and Mks1, in independent N-ethyl-N-nitrosourea-induced mouse mutant lines with heritable recessive AVSDs by whole-exome sequencing. Cilia are required for left/right body axis determination and second heart field (SHF) Hedgehog (Hh) signaling, and we find that cilia mutations affect these requirements differentially. Dnah11avc4 did not disrupt SHF Hh signaling and caused AVSDs only concurrently with heterotaxy, a left/right axis abnormality. In contrast, Mks1avc6 disrupted SHF Hh signaling and caused AVSDs without heterotaxy. We performed unbiased whole-genome SHF transcriptional profiling and found that cilia motility genes were not expressed in the SHF whereas cilia structural and signaling genes were highly expressed. SHF cilia gene expression predicted the phenotypic concordance between AVSDs and heterotaxy in mice and humans with cilia gene mutations. A two-step model of cilia action accurately predicted the AVSD/heterotaxyu phenotypic expression pattern caused by cilia gene mutations. We speculate that cilia gene mutations contribute to both syndromic and non-syndromic AVSDs in humans and provide a model that predicts the phenotypic consequences of specific cilia gene mutations.
Collapse
Affiliation(s)
- Ozanna Burnicka-Turek
- Departments of Pediatrics, Pathology, and Human Genetics, The University of Chicago, Chicago, IL 60637, USA,
| | - Jeffrey D Steimle
- Departments of Pediatrics, Pathology, and Human Genetics, The University of Chicago, Chicago, IL 60637, USA
| | - Wenhui Huang
- Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA
| | - Lindsay Felker
- Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA
| | - Anna Kamp
- Departments of Pediatrics, Pathology, and Human Genetics, The University of Chicago, Chicago, IL 60637, USA
| | - Junghun Kweon
- Departments of Pediatrics, Pathology, and Human Genetics, The University of Chicago, Chicago, IL 60637, USA
| | - Michael Peterson
- Departments of Pediatrics, Pathology, and Human Genetics, The University of Chicago, Chicago, IL 60637, USA
| | - Roger H Reeves
- Department of Physiology and Institute for Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Cheryl L Maslen
- Knight Cardiovascular Institute and Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, OR 97239, USA and
| | - Peter J Gruber
- Department of Cardiothoracic Surgery, University of Iowa, Iowa City, IA 52245, USA
| | - Xinan H Yang
- Departments of Pediatrics, Pathology, and Human Genetics, The University of Chicago, Chicago, IL 60637, USA
| | - Jay Shendure
- Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA
| | - Ivan P Moskowitz
- Departments of Pediatrics, Pathology, and Human Genetics, The University of Chicago, Chicago, IL 60637, USA,
| |
Collapse
|
47
|
Sung YH, Baek IJ, Kim YH, Gho YS, Oh SP, Lee YJ, Lee HW. PIERCE1 is critical for specification of left-right asymmetry in mice. Sci Rep 2016; 6:27932. [PMID: 27305836 PMCID: PMC4917697 DOI: 10.1038/srep27932] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 05/26/2016] [Indexed: 11/09/2022] Open
Abstract
The specification of left-right asymmetry of the visceral organs is precisely regulated. The earliest breakage of left-right symmetry occurs as the result of leftward flow generated by asymmetric beating of nodal cilia, which eventually induces asymmetric Nodal/Lefty/Pitx2 expression on the left side of the lateral plate mesoderm. PIERCE1 has been identified as a p53 target gene involved in the DNA damage response. In this study, we found that Pierce1-null mice exhibit severe laterality defects, including situs inversus totalis and heterotaxy with randomized situs and left and right isomerisms. The spectrum of laterality defects was closely correlated with randomized expression of Nodal and its downstream genes, Lefty1/2 and Pitx2. The phenotype of Pierce1-null mice most closely resembled that of mutant mice with impaired ciliogenesis and/or ciliary motility of the node. We also found the loss of asymmetric expression of Cerl2, the earliest flow-responding gene in the node of Pierce1-null embryos. The results suggest that Pierce1-null embryos have defects in generating a symmetry breaking signal including leftward nodal flow. This is the first report implicating a role for PIERCE1 in the symmetry-breaking step of left-right asymmetry specification.
Collapse
Affiliation(s)
- Young Hoon Sung
- Department of Biochemistry, College of Life Science and Biotechnology and Yonsei Laboratory Animal Research Center, Yonsei University, Seoul 03722, Republic of Korea
| | - In-Jeoung Baek
- Department of Biochemistry, College of Life Science and Biotechnology and Yonsei Laboratory Animal Research Center, Yonsei University, Seoul 03722, Republic of Korea
| | - Yong Hwan Kim
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Yong Song Gho
- Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - S Paul Oh
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Young Jae Lee
- Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon 21999, Republic of Korea
| | - Han-Woong Lee
- Department of Biochemistry, College of Life Science and Biotechnology and Yonsei Laboratory Animal Research Center, Yonsei University, Seoul 03722, Republic of Korea
| |
Collapse
|
48
|
Thevenon J, Duplomb L, Phadke S, Eguether T, Saunier A, Avila M, Carmignac V, Bruel AL, St-Onge J, Duffourd Y, Pazour GJ, Franco B, Attie-Bitach T, Masurel-Paulet A, Rivière JB, Cormier-Daire V, Philippe C, Faivre L, Thauvin-Robinet C. Autosomal recessive IFT57 hypomorphic mutation cause ciliary transport defect in unclassified oral-facial-digital syndrome with short stature and brachymesophalangia. Clin Genet 2016; 90:509-517. [PMID: 27060890 DOI: 10.1111/cge.12785] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 03/31/2016] [Accepted: 04/01/2016] [Indexed: 11/30/2022]
Abstract
The 13 subtypes of oral-facial-digital syndrome (OFDS) belong to the heterogeneous group of ciliopathies. Disease-causing genes encode for centrosomal proteins, components of the transition zone or proteins implicated in ciliary signaling. A unique consanguineous family presenting with an unclassified OFDS with skeletal dysplasia and brachymesophalangia was explored. Homozygosity mapping and exome sequencing led to the identification of a homozygous mutation in IFT57, which encodes a protein implicated in ciliary transport. The mutation caused splicing anomalies with reduced expression of the wild-type transcript and protein. Both anterograde ciliary transport and sonic hedgehog signaling were significantly decreased in subjects' fibroblasts compared with controls. Sanger sequencing of IFT57 in 13 OFDS subjects and 12 subjects with Ellis-Van Creveld syndrome was negative. This report identifies the implication of IFT57 in human pathology and highlights the first description of a ciliary transport defect in OFDS, extending the genetic heterogeneity of this subgroup of ciliopathies.
Collapse
Affiliation(s)
- J Thevenon
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France.,Centre de Référence maladies rares "Anomalies du Développement et syndrome malformatifs" de l'Est et Centre de Génétique, Hôpital d'Enfants, CHU, Dijon, France
| | - L Duplomb
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France
| | - S Phadke
- Department of Medical Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
| | - T Eguether
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA, USA
| | - A Saunier
- Laboratoire de Génétique Médicale, CHU - Hopitaux de Brabois, Vandoeuvre les Nancy cedex, France
| | - M Avila
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France
| | - V Carmignac
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France
| | - A-L Bruel
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France
| | - J St-Onge
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France.,Laboratoire de Génétique Moléculaire, PTB, CHU Dijon, Dijon, France
| | - Y Duffourd
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France
| | - G J Pazour
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA, USA
| | - B Franco
- Telethon Institute of Genetics and Medicine, Naples, Italy.,Medical Genetics, Department of Medical Translational Sciences, University of Napoli Federico II, Naples, Italy.,Department of Medical Translational Sciences, Division of Pediatrics, Federico II University of Naples, Naples, Italy
| | - T Attie-Bitach
- Service de Génétique, Hôpital Necker-Enfants Malades, APHP, Institut Imagine, INSERM UMR1163, University Sorbonne-Paris-Cité, Paris, France
| | - A Masurel-Paulet
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Centre de Référence maladies rares "Anomalies du Développement et syndrome malformatifs" de l'Est et Centre de Génétique, Hôpital d'Enfants, CHU, Dijon, France
| | - J-B Rivière
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France.,Laboratoire de Génétique Moléculaire, PTB, CHU Dijon, Dijon, France
| | - V Cormier-Daire
- Service de Génétique, Hôpital Necker-Enfants Malades, APHP, Institut Imagine, INSERM UMR1163, University Sorbonne-Paris-Cité, Paris, France
| | - C Philippe
- Laboratoire de Génétique Médicale, CHU - Hopitaux de Brabois, Vandoeuvre les Nancy cedex, France
| | - L Faivre
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France.,Centre de Référence maladies rares "Anomalies du Développement et syndrome malformatifs" de l'Est et Centre de Génétique, Hôpital d'Enfants, CHU, Dijon, France
| | - C Thauvin-Robinet
- FHU-TRANSLAD, Université de Bourgogne/CHU Dijon, Dijon, France.,Equipe EA4271 GAD, Université de Bourgogne, Dijon, France.,Centre de Référence maladies rares "Anomalies du Développement et syndrome malformatifs" de l'Est et Centre de Génétique, Hôpital d'Enfants, CHU, Dijon, France
| |
Collapse
|
49
|
Sugiyama Y, Shelley EJ, Yoder BK, Kozmik Z, May-Simera HL, Beales PL, Lovicu FJ, McAvoy JW. Non-essential role for cilia in coordinating precise alignment of lens fibres. Mech Dev 2016; 139:10-7. [PMID: 26825015 DOI: 10.1016/j.mod.2016.01.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 01/21/2016] [Accepted: 01/24/2016] [Indexed: 12/14/2022]
Abstract
The primary cilium, a microtubule-based organelle found in most cells, is a centre for mechano-sensing fluid movement and cellular signalling, notably through the Hedgehog pathway. We recently found that each lens fibre cell has an apically situated primary cilium that is polarised to the side of the cell facing the anterior pole of the lens. The direction of polarity is similar in neighbouring cells so that in the global view, lens fibres exhibit planar cell polarity (PCP) along the equatorial-anterior polar axis. Ciliogenesis has been associated with the establishment of PCP, although the exact relationship between PCP and the role of cilia is still controversial. To test the hypothesis that the primary cilia have a role in coordinating the precise alignment/orientation of the fibre cells, IFT88, a key component of the intraflagellar transport (IFT) complex, was removed specifically from the lens at different developmental stages using several lens-specific Cre-expressing mouse lines (MLR10- and LR-Cre). Irrespective of which Cre-line was adopted, both demonstrated that in IFT88-depleted cells, the ciliary axoneme was absent or substantially shortened, confirming the disruption of primary cilia formation. However no obvious histological defects were detected even when IFT88 was removed from the lens placode as early as E9.5. Specifically, the lens fibres aligned/oriented towards the poles to form the characteristic Y-shaped sutures as normal. Consistent with this, in primary lens epithelial explants prepared from these conditional knockout mouse lenses, the basal bodies still showed polarised localisation at the apical surface of elongating cells upon FGF-induced fibre differentiation. We further investigated the lens phenotype in knockouts of Bardet-Biedl Syndrome (BBS) proteins 4 and 8, the components of the BBSome complex which modulate ciliary function. In these BBS4 and 8 knockout lenses, again we found the pattern of the anterior sutures formed by the apical tips of elongating/migrating fibres were comparable to the control lenses. Taken together, these results indicate that primary cilia do not play an essential role in the precise cellular alignment/orientation of fibre cells. Thus, it appears that in the lens cilia are not required to establish PCP.
Collapse
Affiliation(s)
- Yuki Sugiyama
- Save Sight Institute, The University of Sydney, Sydney, NSW 2000, Australia.
| | | | - Bradley K Yoder
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Zbynek Kozmik
- Department of Transcriptional Regulation, Institute of Molecular Genetics, Prague CZ-14220, Czech Republic
| | - Helen L May-Simera
- Institute of Zoology, Johannes-Gutenberg University, Mainz 55128, Germany
| | - Philip L Beales
- Genetics and Genomic Medicine, University College London Institute of Child Health, London WC1N 1EH, UK
| | - Frank J Lovicu
- Anatomy and Histology, School of Medical Sciences and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - John W McAvoy
- Save Sight Institute, The University of Sydney, Sydney, NSW 2000, Australia
| |
Collapse
|
50
|
Abstract
Sperm motility is driven by motile cytoskeletal elements in the tail, called axonemes. The structure of axonemes consists of 9 + 2 microtubules, molecular motors (dyneins), and their regulatory structures. Axonemes are well conserved in motile cilia and flagella through eukaryotic evolution. Deficiency in the axonemal structure causes defects in sperm motility, and often leads to male infertility. It has been known since the 1970s that, in some cases, male infertility is linked with other symptoms or diseases such as Kartagener syndrome. Given that these links are mostly caused by deficiencies in the common components of cilia and flagella, they are called "immotile cilia syndrome" or "primary ciliary dyskinesia," or more recently, "ciliopathy," which includes deficiencies in primary and sensory cilia. Here, we review the structure of the sperm flagellum and epithelial cilia in the human body, and discuss how male fertility is linked to ciliopathy.
Collapse
|