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Almomen M, Burgon PG. Why Craniofacial Surgeons/Researchers Need to be Aware of Native American Myopathy? Neuropediatrics 2024; 55:149-155. [PMID: 38378040 DOI: 10.1055/a-2271-8619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Congenital myopathy type 13 (CMYO13), also known as Native American myopathy, is a rare muscle disease characterized by early-onset hypotonia, muscle weakness, delayed motor milestones, and susceptibility to malignant hyperthermia. The phenotypic spectrum of congenital myopathy type 13 is expanding, with milder forms reported in non-native American patients. The first description of the disease dates to 1987 when Bailey and Bloch described an infant belonging to a Native American tribe with cleft palate, micrognathia, arthrogryposis, and general-anesthesia-induced malignant hyperthermia reaction; the cause of the latter remains poorly defined in this rare disease. The pan-ethnic distribution, as well as its predisposition to malignant hyperthermia, makes the identification of CMYO13 essential to avoid life-threatening, anesthesia-related complications. In this article, we are going to review the clinical phenotype of this disease and the pathophysiology of this rare disease with a focus on two unique features of the disease, namely cleft palate and malignant hyperthermia. We also highlight the importance of recognizing this disease's expanding phenotypic spectrum-including its susceptibility to malignant hyperthermia-and providing appropriate care to affected individuals and families.
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Affiliation(s)
- Momen Almomen
- Department of Neurosciences, King Fahad Specialist Hospital, Dammam, Kingdom of Saudi Arabia
| | - Patrick G Burgon
- Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, State of Qatar
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2
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Dugdale HF, Levy Y, Jungbluth H, Oldfors A, Ochala J. Aberrant myonuclear domains and impaired myofiber contractility despite marked hypertrophy in MYMK-related, Carey-Fineman-Ziter Syndrome. Acta Neuropathol Commun 2024; 12:80. [PMID: 38790073 PMCID: PMC11127446 DOI: 10.1186/s40478-024-01783-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 04/10/2024] [Indexed: 05/26/2024] Open
Abstract
Carey Fineman Ziter Syndrome (CFZS) is a rare autosomal recessive disease caused by mutations in the MYMK locus which encodes the protein, myomaker. Myomaker is essential for fusion and concurrent myonuclei donation of muscle progenitors during growth and development. Strikingly, in humans, MYMK mutations appear to prompt myofiber hypertrophy but paradoxically, induce generalised muscle weakness. As the underlying cellular mechanisms remain unexplored, the present study aimed to gain insights by combining myofiber deep-phenotyping and proteomic profiling. Hence, we isolated individual muscle fibers from CFZS patients and performed mechanical, 3D morphological and proteomic analyses. Myofibers from CFZS patients were ~ 4x larger than controls and possessed ~ 2x more myonuclei than those from healthy subjects, leading to disproportionally larger myonuclear domain volumes. These greater myonuclear domain sizes were accompanied by smaller intrinsic cellular force generating-capacities in myofibers from CFZS patients than in control muscle cells. Our complementary proteomic analyses indicated remodelling in 233 proteins particularly those associated with cellular respiration. Overall, our findings suggest that myomaker is somewhat functional in CFZS patients, but the associated nuclear accretion may ultimately lead to non-functional hypertrophy and altered energy-related mechanisms in CFZS patients. All of these are likely contributors of the muscle weakness experienced by CFZS patients.
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Affiliation(s)
- Hannah F Dugdale
- School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Yotam Levy
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Heinz Jungbluth
- Randall Centre for Cell and Molecular Biophysics, Muscle Signalling Section, Faculty of Life Sciences and Medicine (FoLSM), King's College London, London, UK
- Department of Paediatric Neurology, Neuromuscular Service, Evelina Children's Hospital, Guy's and St Thomas' Hospital NHS Foundation Trust, London, UK
| | - Anders Oldfors
- Department of Laboratory Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Julien Ochala
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
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3
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Liberton DK, Almpani K, Mishra R, Bassim C, Van Ryzin C, Webb BD, Jabs EW, Engle EC, Collins FS, Manoli I, Lee JS. Oral Health-Related Quality of Life in Rare Disorders of Congenital Facial Weakness. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2024; 21:615. [PMID: 38791829 PMCID: PMC11121611 DOI: 10.3390/ijerph21050615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 04/30/2024] [Accepted: 05/08/2024] [Indexed: 05/26/2024]
Abstract
Congenital facial weakness (CFW) encompasses a heterogenous set of rare disorders presenting with decreased facial movement from birth, secondary to impaired function of the facial musculature. The aim of the present study is to provide an analysis of subject-reported oral health-related quality of life (OHRQoL) in congenital facial weakness (CFW) disorders. Forty-four subjects with CFW and age- and sex- matched controls were enrolled in an Institutional Review Board (IRB)-approved study. Demographic data, medical and surgical history, comprehensive oral examination, and the Oral Health Impact Profile (OHIP-14) were obtained. Compared to unaffected controls, subjects with CFW had higher OHIP-14 scores overall (mean ± SD: 13.11 ± 8.11 vs. 4.46 ± 4.98, p < 0.0001) and within five of seven oral health domains, indicating decreased OHRQoL. Although subjects with Moebius syndrome (MBS) were noted to have higher OHIP-14 scores than those with Hereditary Congenital Facial Paresis (HCFP), there was no significant correlation in OHIP-14 score to age, sex, or specific diagnosis. An increase in OHIP-14 scores in subjects was detected in those who had undergone reanimation surgery. In conclusion, subjects with CFW had poorer OHRQoL compared to controls, and subjects with MBS had poorer OHRQoL than subjects with HCFP. This study provides better understanding of oral health care needs and quality of life in a CFW cohort and suggests that guidelines for dental treatment are required.
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Affiliation(s)
- Denise K. Liberton
- Craniofacial Anomalies and Regeneration Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA; (D.K.L.); (K.A.); (C.B.)
| | - Konstantinia Almpani
- Craniofacial Anomalies and Regeneration Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA; (D.K.L.); (K.A.); (C.B.)
| | - Rashmi Mishra
- Department of Orofacial Sciences, School of Dentistry, University of California, San Francisco, CA 94143, USA;
| | - Carol Bassim
- Craniofacial Anomalies and Regeneration Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA; (D.K.L.); (K.A.); (C.B.)
| | - Carol Van Ryzin
- Metabolic Medicine Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA;
| | | | - Bryn D. Webb
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (B.D.W.); (E.W.J.)
- Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI 53705, USA
| | - Ethylin Wang Jabs
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (B.D.W.); (E.W.J.)
- Department of Clinical Genomics, Mayo Clinic, Rochester, MN 55902, USA
| | - Elizabeth C. Engle
- Departments of Neurology and Ophthalmology, Boston Children’s Hospital, Boston, MA 02115, USA;
- Departments of Neurology and Ophthalmology, Harvard Medical School, Boston, MA 02115, USA
- Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA
| | - Francis S. Collins
- Center for Precision Health Research, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA;
| | - Irini Manoli
- Metabolic Medicine Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA;
| | - Janice S. Lee
- Craniofacial Anomalies and Regeneration Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA; (D.K.L.); (K.A.); (C.B.)
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4
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Wherley TJ, Thomas S, Millay DP, Saunders T, Roy S. Molecular regulation of myocyte fusion. Curr Top Dev Biol 2024; 158:53-82. [PMID: 38670716 DOI: 10.1016/bs.ctdb.2024.01.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2024]
Abstract
Myocyte fusion is a pivotal process in the development and regeneration of skeletal muscle. Failure during fusion can lead to a range of developmental as well as pathological consequences. This review aims to comprehensively explore the intricate processes underlying myocyte fusion, from the molecular to tissue scale. We shed light on key players, such as the muscle-specific fusogens - Myomaker and Myomixer, in addition to some lesser studied molecules contributing to myocyte fusion. Conserved across vertebrates, Myomaker and Myomixer play a crucial role in driving the merger of plasma membranes of fusing myocytes, ensuring the formation of functional muscle syncytia. Our multiscale approach also delves into broader cell and tissue dynamics that orchestrate the timing and positioning of fusion events. In addition, we explore the relevance of muscle fusogens to human health and disease. Mutations in fusogen genes have been linked to congenital myopathies, providing unique insights into the molecular basis of muscle diseases. We conclude with a discussion on potential therapeutic avenues that may emerge from manipulating the myocyte fusion process to remediate skeletal muscle disorders.
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Affiliation(s)
- Tanner J Wherley
- Division of Molecular Cardiovascular Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States
| | - Serena Thomas
- Warwick Medical School, University of Warwick, Coventry, United Kingdom; Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Proteos, Singapore, Singapore
| | - Douglas P Millay
- Division of Molecular Cardiovascular Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, United States.
| | - Timothy Saunders
- Warwick Medical School, University of Warwick, Coventry, United Kingdom; Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Proteos, Singapore, Singapore.
| | - Sudipto Roy
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research, Proteos, Singapore, Singapore; Department of Biological Sciences, National University of Singapore, Singapore, Singapore; Department of Pediatrics, National University of Singapore, Singapore, Singapore.
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5
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Xu D, Wan B, Qiu K, Wang Y, Zhang X, Jiao N, Yan E, Wu J, Yu R, Gao S, Du M, Liu C, Li M, Fan G, Yin J. Single-Cell RNA-Sequencing Provides Insight into Skeletal Muscle Evolution during the Selection of Muscle Characteristics. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2305080. [PMID: 37870215 PMCID: PMC10724408 DOI: 10.1002/advs.202305080] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 09/27/2023] [Indexed: 10/24/2023]
Abstract
Skeletal muscle comprises a large, heterogeneous assortment of cell populations that interact to maintain muscle homeostasis, but little is known about the mechanism that controls myogenic development in response to artificial selection. Different pig (Sus scrofa) breeds exhibit distinct muscle phenotypes resulting from domestication and selective breeding. Using unbiased single-cell transcriptomic sequencing analysis (scRNA-seq), the impact of artificial selection on cell profiles is investigated in neonatal skeletal muscle of pigs. This work provides panoramic muscle-resident cell profiles and identifies novel and breed-specific cells, mapping them on pseudotime trajectories. Artificial selection has elicited significant changes in muscle-resident cell profiles, while conserving signs of generational environmental challenges. These results suggest that fibro-adipogenic progenitors serve as a cellular interaction hub and that specific transcription factors identified here may serve as candidate target regulons for the pursuit of a specific muscle phenotype. Furthermore, a cross-species comparison of humans, mice, and pigs illustrates the conservation and divergence of mammalian muscle ontology. The findings of this study reveal shifts in cellular heterogeneity, novel cell subpopulations, and their interactions that may greatly facilitate the understanding of the mechanism underlying divergent muscle phenotypes arising from artificial selection.
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Affiliation(s)
- Doudou Xu
- State Key Laboratory of Animal Nutrition and feedingCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China
| | - Boyang Wan
- State Key Laboratory of Animal Nutrition and feedingCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China
| | - Kai Qiu
- State Key Laboratory of Animal Nutrition and feedingCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China
| | - Yubo Wang
- State Key Laboratory of Animal Nutrition and feedingCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China
| | - Xin Zhang
- State Key Laboratory of Animal Nutrition and feedingCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China
- Molecular Design Breeding Frontier Science Center of the Ministry of EducationBeijingChina
| | - Ning Jiao
- State Key Laboratory of Animal Nutrition and feedingCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China
| | - Enfa Yan
- State Key Laboratory of Animal Nutrition and feedingCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China
| | - Jiangwei Wu
- Key Laboratory of Animal GeneticsBreeding and Reproduction of Shaanxi ProvinceCollege of Animal Science and TechnologyNorthwest A&F UniversityYangling712100China
| | - Run Yu
- Beijing National Day SchoolBeijing100039China
| | - Shuai Gao
- Key Laboratory of Animal GeneticsCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China
| | - Min Du
- Nutrigenomics and Growth Biology LaboratoryDepartment of Animal Sciences and School of Molecular BioscienceWashington State UniversityPullmanWA99164USA
| | | | - Mingzhou Li
- Institute of Animal Genetics and BreedingCollege of Animal Science and TechnologySichuan Agricultural UniversityChengdu625014China
| | - Guoping Fan
- Department of Human GeneticsDavid Geffen School of MedicineUniversity of California Los AngelesLos AngelesCA90095USA
| | - Jingdong Yin
- State Key Laboratory of Animal Nutrition and feedingCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China
- Molecular Design Breeding Frontier Science Center of the Ministry of EducationBeijingChina
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Long T, Zhang Y, Donnelly L, Li H, Pien YC, Liu N, Olson EN, Li X. Cryo-EM structures of Myomaker reveal a molecular basis for myoblast fusion. Nat Struct Mol Biol 2023; 30:1746-1754. [PMID: 37770716 DOI: 10.1038/s41594-023-01110-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 08/25/2023] [Indexed: 09/30/2023]
Abstract
The fusion of mononucleated myoblasts produces multinucleated muscle fibers leading to the formation of skeletal muscle. Myomaker, a skeletal muscle-specific membrane protein, is essential for myoblast fusion. Here we report the cryo-EM structures of mouse Myomaker (mMymk) and Ciona robusta Myomaker (cMymk). Myomaker contains seven transmembrane helices (TMs) that adopt a G-protein-coupled receptor-like fold. TMs 2-4 form a dimeric interface, while TMs 3 and 5-7 create a lipid-binding site that holds the polar head of a phospholipid and allows the alkyl tails to insert into Myomaker. The similarity of cMymk and mMymk suggests a conserved Myomaker-mediated cell fusion mechanism across evolutionarily distant species. Functional analyses demonstrate the essentiality of the dimeric interface and the lipid-binding site for fusogenic activity, and heterologous cell-cell fusion assays show the importance of transcellular interactions of Myomaker protomers for myoblast fusion. Together, our findings provide structural and functional insights into the process of myoblast fusion.
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Affiliation(s)
- Tao Long
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Yichi Zhang
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Linda Donnelly
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Hui Li
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Yu-Chung Pien
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Ning Liu
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Eric N Olson
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
| | - Xiaochun Li
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA.
- Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA.
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7
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Kurosaka M, Hung YL, Machida S, Kohda K. IL-4 Signaling Promotes Myoblast Differentiation and Fusion by Enhancing the Expression of MyoD, Myogenin, and Myomerger. Cells 2023; 12:cells12091284. [PMID: 37174683 PMCID: PMC10177410 DOI: 10.3390/cells12091284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 04/20/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023] Open
Abstract
Myoblast fusion is essential for skeletal muscle development, growth, and regeneration. However, the molecular mechanisms underlying myoblast fusion and differentiation are not fully understood. Previously, we reported that interleukin-4 (IL-4) promotes myoblast fusion; therefore, we hypothesized that IL-4 signaling might regulate the expression of the molecules involved in myoblast fusion. In this study, we showed that in addition to fusion, IL-4 promoted the differentiation of C2C12 myoblast cells by inducing myoblast determination protein 1 (MyoD) and myogenin, both of which regulate the expression of myomerger and myomaker, the membrane proteins essential for myoblast fusion. Unexpectedly, IL-4 treatment increased the expression of myomerger, but not myomaker, in C2C12 cells. Knockdown of IL-4 receptor alpha (IL-4Rα) in C2C12 cells by small interfering RNA impaired myoblast fusion and differentiation. We also demonstrated a reduction in the expression of MyoD, myogenin, and myomerger by knockdown of IL-4Rα in C2C12 cells, while the expression level of myomaker remained unchanged. Finally, cell mixing assays and the restoration of myomerger expression partially rescued the impaired fusion in the IL-4Rα-knockdown C2C12 cells. Collectively, these results suggest that the IL-4/IL-4Rα axis promotes myoblast fusion and differentiation via the induction of myogenic regulatory factors, MyoD and myogenin, and myomerger.
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Affiliation(s)
- Mitsutoshi Kurosaka
- Department of Physiology, St. Marianna University School of Medicine, Kanagawa 216-8511, Japan
| | - Yung-Li Hung
- Institute of Health and Sports & Medicine, Juntendo University, Chiba 270-1695, Japan
| | - Shuichi Machida
- Institute of Health and Sports & Medicine, Juntendo University, Chiba 270-1695, Japan
- Graduate School of Health and Sports Science, Juntendo University, Chiba 270-1695, Japan
| | - Kazuhisa Kohda
- Department of Physiology, St. Marianna University School of Medicine, Kanagawa 216-8511, Japan
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Monawwer SA, Ali S, Naeem R, Ali SH, Rabbani A, Khan M, Qazi SS, Shah SMI, Farooqui SK. Moebius Syndrome: An Updated Review of Literature. Child Neurol Open 2023; 10:2329048X231205405. [PMID: 37868706 PMCID: PMC10588417 DOI: 10.1177/2329048x231205405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 08/21/2023] [Accepted: 09/08/2023] [Indexed: 10/24/2023] Open
Abstract
Moebius Syndrome, is a rare, non-progressive congenital neuropathological syndrome characterized primarily by the underdevelopment of the facial (CN VII) and abducens nerve (CN VI). Other features of Moebius Syndrome include facial nerve paresis, ophthalmoplegias, orthodontic deficiencies (including crowded dentition, swollen and hyperplastic gingiva, dental calculus, etc.), musculoskeletal abnormalities, and impaired mental function. Due to the rarity of the disorder, very few case studies have been reported in the literature. This article summarizes the significant features of the disease according to commonalities in reported cases, along with several newly recognized features cited in recent literature. We have explored the different diagnostic criteria and the newly recognized imaging modalities that may be used. Understandably, the condition detrimentally affects a patient's quality of life; thus, treatment measures have also been outlined. This study aims to provide updated literature on Moebius Syndrome MBS and improve understanding of the condition.
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Affiliation(s)
| | - Sajjad Ali
- Department of Internal Medicine, Ziauddin Medical University, Karachi, Pakistan
| | - Raahim Naeem
- Department of Internal Medicine, Dow Medical College, Dow University of Health Sciences, Karachi, Pakistan
| | - Syed Hasan Ali
- Department of Internal Medicine, Dow Medical College, Dow University of Health Sciences, Karachi, Pakistan
| | - Azkah Rabbani
- Department of Internal Medicine, Dow Medical College, Dow University of Health Sciences, Karachi, Pakistan
| | - Maria Khan
- Department of Internal Medicine, Ziauddin Medical University, Karachi, Pakistan
| | - Saba Saleem Qazi
- Department of Internal Medicine, Ziauddin Medical University, Karachi, Pakistan
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Glass GE, Mohammedali S, Sivakumar B, Stotland MA, Abdulkader F, Prosser DO, Love DR. Poland-Möbius syndrome: a case report implicating a novel mutation of the PLXND1 gene and literature review. BMC Pediatr 2022; 22:745. [PMID: 36581828 PMCID: PMC9801559 DOI: 10.1186/s12887-022-03803-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 12/14/2022] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Möbius (Moebius) and Poland's syndromes are two rare congenital syndromes characterized by non-progressive bilateral (and often asymmetric) dysfunction of the 6th and 7th cranial nerves and hypoplasia of the pectoral muscles associated with chest wall and upper limb anomalies respectively. Manifest simultaneously as Poland-Möbius (Poland-Moebius) syndrome, debate continues as to whether this is a distinct nosological entity or represents phenotypic variation as part of a spectrum of disorders of rhomboencephalic development. Etiological hypotheses implicate both genetic and environmental factors. The PLXND1 gene codes for a protein expressed in the fetal central nervous system and vascular endothelium and is thus involved in embryonic neurogenesis and vasculogenesis. It is located at chromosome region 3q21-q22, a locus of interest for Möbius syndrome. CASE PRESENTATION We present the first report of a patient with Poland-Möbius syndrome and a mutation in the PLXND1 gene. A child with Poland-Möbius syndrome and a maternally inherited missense variant (NM_015103.2:ex14:c.2890G > Ap.V964M) in the PLXND1 gene is described. In order to contextualize these findings, the literature was examined to identify other confirmed cases of Poland-Möbius syndrome for which genetic data were available. Fourteen additional cases of Poland-Möbius syndrome with genetic studies are described in the literature. None implicated the PLXND1 gene which has previously been implicated in isolated Möbius syndrome. CONCLUSIONS This report provides further evidence in support of a role for PLXND1 mutations in Möbius syndrome and reasserts the nosological link between Möbius and Poland's syndromes. LEVEL OF EVIDENCE Level V, Descriptive Study.
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Affiliation(s)
- Graeme E. Glass
- grid.467063.00000 0004 0397 4222Department of Surgery, Sidra Medicine, Doha, Qatar ,grid.5386.8000000041936877XWeill Cornell Medical College, Doha, USA ,grid.416973.e0000 0004 0582 4340Weill-Cornell Medical College, Ar-Rayyan, Qatar ,grid.418818.c0000 0001 0516 2170Qatar Foundation, Education City North Campus, Room C1-120, 1st Floor OPC, Al Luqta Street, PO BOX 26999, Doha, Qatar
| | - Shiyas Mohammedali
- grid.467063.00000 0004 0397 4222Department of Surgery, Sidra Medicine, Doha, Qatar
| | - Bran Sivakumar
- grid.467063.00000 0004 0397 4222Department of Surgery, Sidra Medicine, Doha, Qatar ,grid.424537.30000 0004 5902 9895Department of Plastic Surgery, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK
| | - Mitchell A. Stotland
- grid.467063.00000 0004 0397 4222Department of Surgery, Sidra Medicine, Doha, Qatar ,grid.5386.8000000041936877XWeill Cornell Medical College, Doha, USA ,grid.416973.e0000 0004 0582 4340Weill-Cornell Medical College, Ar-Rayyan, Qatar
| | - Faisal Abdulkader
- grid.467063.00000 0004 0397 4222Department of Surgery, Sidra Medicine, Doha, Qatar ,grid.5386.8000000041936877XWeill Cornell Medical College, Doha, USA ,grid.416973.e0000 0004 0582 4340Weill-Cornell Medical College, Ar-Rayyan, Qatar
| | - Debra O. Prosser
- grid.467063.00000 0004 0397 4222Department of Pathology, Sidra Medicine, Doha, Qatar
| | - Donald R. Love
- grid.467063.00000 0004 0397 4222Department of Pathology, Sidra Medicine, Doha, Qatar
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10
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Tran V, Nahlé S, Robert A, Desanlis I, Killoran R, Ehresmann S, Thibault MP, Barford D, Ravichandran KS, Sauvageau M, Smith MJ, Kmita M, Côté JF. Biasing the conformation of ELMO2 reveals that myoblast fusion can be exploited to improve muscle regeneration. Nat Commun 2022; 13:7077. [PMID: 36400788 PMCID: PMC9674853 DOI: 10.1038/s41467-022-34806-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 11/08/2022] [Indexed: 11/21/2022] Open
Abstract
Myoblast fusion is fundamental for the development of multinucleated myofibers. Evolutionarily conserved proteins required for myoblast fusion include RAC1 and its activator DOCK1. In the current study we analyzed the contribution of the DOCK1-interacting ELMO scaffold proteins to myoblast fusion. When Elmo1-/- mice underwent muscle-specific Elmo2 genetic ablation, they exhibited severe myoblast fusion defects. A mutation in the Elmo2 gene that reduced signaling resulted in a decrease in myoblast fusion. Conversely, a mutation in Elmo2 coding for a protein with an open conformation increased myoblast fusion during development and in muscle regeneration. Finally, we showed that the dystrophic features of the Dysferlin-null mice, a model of limb-girdle muscular dystrophy type 2B, were reversed when expressing ELMO2 in an open conformation. These data provide direct evidence that the myoblast fusion process could be exploited for regenerative purposes and improve the outcome of muscle diseases.
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Affiliation(s)
- Viviane Tran
- Montreal Clinical Research Institute (IRCM), Montreal, QC, H2W 1R7, Canada
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montreal, QC, H3C 3J7, Canada
| | - Sarah Nahlé
- Montreal Clinical Research Institute (IRCM), Montreal, QC, H2W 1R7, Canada
- Molecular Biology Programs, Université de Montréal, Montréal, QC, H3T 1J4, Canada
| | - Amélie Robert
- Montreal Clinical Research Institute (IRCM), Montreal, QC, H2W 1R7, Canada
| | - Inès Desanlis
- Montreal Clinical Research Institute (IRCM), Montreal, QC, H2W 1R7, Canada
- Department of Medicine, Université de Montréal, Montreal, QC, H3C 3J7, Canada
| | - Ryan Killoran
- Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, QC, H3T 1J4, Canada
| | - Sophie Ehresmann
- Montreal Clinical Research Institute (IRCM), Montreal, QC, H2W 1R7, Canada
- Molecular Biology Programs, Université de Montréal, Montréal, QC, H3T 1J4, Canada
| | | | - David Barford
- MRC Laboratory of Molecular Biology, Cambridge, CB2 OQH, UK
| | - Kodi S Ravichandran
- Department of Microbiology, Immunology, and Cancer Biology, University of Virginia, Charlottesville, 22908, VA, USA
- VIB/UGent Inflammation Research Centre, Biomedical Molecular Biology, Ghent University, 9052, Ghent, Belgium
| | - Martin Sauvageau
- Montreal Clinical Research Institute (IRCM), Montreal, QC, H2W 1R7, Canada
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montreal, QC, H3C 3J7, Canada
- Molecular Biology Programs, Université de Montréal, Montréal, QC, H3T 1J4, Canada
- Department of Biochemistry, McGill University, Montréal, QC, H3G 1Y6, Canada
| | - Matthew J Smith
- Institute for Research in Immunology and Cancer, Université de Montréal, Montreal, QC, H3T 1J4, Canada
- Department of Pathology and Cell Biology, Université de Montréal, Montreal, QC, H3C 3J7, Canada
| | - Marie Kmita
- Montreal Clinical Research Institute (IRCM), Montreal, QC, H2W 1R7, Canada
- Molecular Biology Programs, Université de Montréal, Montréal, QC, H3T 1J4, Canada
- Department of Medicine, Université de Montréal, Montreal, QC, H3C 3J7, Canada
- Department of Experimental Medicine, McGill University, Montréal, QC, H3G 2M1, Canada
| | - Jean-François Côté
- Montreal Clinical Research Institute (IRCM), Montreal, QC, H2W 1R7, Canada.
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montreal, QC, H3C 3J7, Canada.
- Molecular Biology Programs, Université de Montréal, Montréal, QC, H3T 1J4, Canada.
- Department of Medicine, Université de Montréal, Montreal, QC, H3C 3J7, Canada.
- Department of Anatomy and Cell Biology, McGill University, Montréal, QC, H3A 0C7, Canada.
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11
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Wu P, Yong P, Zhang Z, Xu R, Shang R, Shi J, Zhang J, Bi P, Chen E, Du S. Loss of Myomixer Results in Defective Myoblast Fusion, Impaired Muscle Growth, and Severe Myopathy in Zebrafish. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2022; 24:1023-1038. [PMID: 36083384 PMCID: PMC10112271 DOI: 10.1007/s10126-022-10159-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
The development and growth of fish skeletal muscles require myoblast fusion to generate multinucleated myofibers. While zebrafish fast-twitch muscle can fuse to generate multinucleated fibers, the slow-twitch muscle fibers remain mononucleated in zebrafish embryos and larvae. The mechanism underlying the fiber-type-specific control of fusion remains elusive. Recent genetic studies using mice identified a long-sought fusion factor named Myomixer. To understand whether Myomixer is involved in the fiber-type specific fusion, we analyzed the transcriptional regulation of myomixer expression and characterized the muscle growth phenotype upon genetic deletion of myomixer in zebrafish. The data revealed that overexpression of Sonic Hedgehog (Shh) drastically inhibited myomixer expression and blocked myoblast fusion, recapitulating the phenotype upon direct genetic deletion of myomixer from zebrafish. The fusion defect in myomixer mutant embryos could be faithfully rescued upon re-expression of zebrafish myomixer gene or its orthologs from shark or human. Interestingly, myomixer mutant fish survived to adult stage though were notably smaller than wildtype siblings. Severe myopathy accompanied by the uncontrolled adipose infiltration was observed in both fast and slow muscle tissues of adult myomixer mutants. Collectively, our data highlight an indispensable role of myomixer gene for cell fusion during both embryonic muscle development and post-larval muscle growth.
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Affiliation(s)
- Ping Wu
- Department of Biochemistry and Molecular Biology, Institute of Marine and Environmental Technology, University of Maryland School of Medicine, Baltimore, USA
- Department of Bioengineering and Environmental Science, Changsha University, Changsha, China
| | - Pengzheng Yong
- Department of Biochemistry and Molecular Biology, Institute of Marine and Environmental Technology, University of Maryland School of Medicine, Baltimore, USA
| | - Zhanxiong Zhang
- Department of Biochemistry and Molecular Biology, Institute of Marine and Environmental Technology, University of Maryland School of Medicine, Baltimore, USA
| | - Rui Xu
- Department of Biochemistry and Molecular Biology, Institute of Marine and Environmental Technology, University of Maryland School of Medicine, Baltimore, USA
| | - Renjie Shang
- Center for Molecular Medicine & Department of Genetics, University of Georgia, Athens, USA
| | - Jun Shi
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, USA
- College of Marine Sciences, South China Agricultural University, Guangzhou, China
| | - Jianshe Zhang
- Department of Bioengineering and Environmental Science, Changsha University, Changsha, China
| | - Pengpeng Bi
- Center for Molecular Medicine & Department of Genetics, University of Georgia, Athens, USA
| | - Elizabeth Chen
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, USA
| | - Shaojun Du
- Department of Biochemistry and Molecular Biology, Institute of Marine and Environmental Technology, University of Maryland School of Medicine, Baltimore, USA.
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12
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Gromand M, Gueguen P, Pervillé A, Ferroul F, Morel G, Harouna A, Doray B, Urtizberea JA, Alessandri JL, Robin S. STAC3 related congenital myopathy: A case series of seven Comorian patients. Eur J Med Genet 2022; 65:104598. [PMID: 36030003 DOI: 10.1016/j.ejmg.2022.104598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 05/29/2022] [Accepted: 08/21/2022] [Indexed: 11/17/2022]
Abstract
The Bailey-Bloch congenital myopathy, also known as Native American myopathy (NAM), is an autosomal recessive congenital myopathy first reported in the Lumbee tribe people settled in North Carolina (USA), and characterized by congenital weakness and arthrogryposis, cleft palate, ptosis, short stature, kyphoscoliosis, talipes deformities, and susceptibility to malignant hyperthermia (MH) triggered by anesthesia. NAM is linked to STAC3 gene coding for a component of excitation-contraction coupling in skeletal muscles. A homozygous missense variant (c.851G > C; p.Trp284Ser) in STAC3 segregated with NAM in the Lumbee families. Non-Native American patients with STAC3 related congenital myopathy, and with other various variants of STAC3 have been reported. Here, we present seven patients from the Comoros Islands (located in the Mozambique Channel) diagnosed with STAC3 related congenital myopathy and having the recurrent variant identified in the Lumbee people. The series is the second largest series of patients having STAC3 related congenital myopathy with a shared ethnicity after le Lumbee series. Local history and geography may explain the overrepresentation of NAM in the Comorian Archipelago with a founder effect. Further researches would be necessary for the understanding of the onset of the NAM in Comorian population as search of the "classical" STAC3 variant in East African population, and haplotypes comparison between Comorian and Lumbee patients.
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Affiliation(s)
- Marie Gromand
- Department of Pediatrics, University Hospital Félix Guyon, La Réunion, France
| | - Paul Gueguen
- Department of Medical Genetics, University Hospital Félix Guyon, La Réunion, France
| | | | - Fanny Ferroul
- Department of Medical Genetics, University Hospital Félix Guyon, La Réunion, France
| | - Godelieve Morel
- Department of Medical Genetics, University Hospital Félix Guyon, La Réunion, France
| | | | - Bérénice Doray
- Department of Medical Genetics, University Hospital Félix Guyon, La Réunion, France
| | - J Andoni Urtizberea
- Centre de Compétence Neuromusculaire, FILNEMUS, Hôpital Marin, Hendaye, France
| | - Jean-Luc Alessandri
- Department of Medical Genetics, University Hospital Félix Guyon, La Réunion, France.
| | - Stéphanie Robin
- Department of Pediatrics, University Hospital Félix Guyon, La Réunion, France
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13
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Luo Z, Shi J, Pandey P, Ruan ZR, Sevdali M, Bu Y, Lu Y, Du S, Chen EH. The cellular architecture and molecular determinants of the zebrafish fusogenic synapse. Dev Cell 2022; 57:1582-1597.e6. [PMID: 35709765 PMCID: PMC10180866 DOI: 10.1016/j.devcel.2022.05.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 04/04/2022] [Accepted: 05/20/2022] [Indexed: 11/03/2022]
Abstract
Myoblast fusion is an indispensable process in skeletal muscle development and regeneration. Studies in Drosophila led to the discovery of the asymmetric fusogenic synapse, in which one cell invades its fusion partner with actin-propelled membrane protrusions to promote fusion. However, the timing and sites of vertebrate myoblast fusion remain elusive. Here, we show that fusion between zebrafish fast muscle cells is mediated by an F-actin-enriched invasive structure. Two cell adhesion molecules, Jam2a and Jam3b, are associated with the actin structure, with Jam2a being the major organizer. The Arp2/3 actin nucleation-promoting factors, WAVE and WASP-but not the bipartite fusogenic proteins, Myomaker or Myomixer-promote the formation of the invasive structure. Moreover, the convergence of fusogen-containing microdomains and the invasive protrusions is a prerequisite for cell membrane fusion. Thus, our study provides unprecedented insights into the cellular architecture and molecular determinants of the asymmetric fusogenic synapse in an intact vertebrate animal.
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Affiliation(s)
- Zhou Luo
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Jun Shi
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
| | - Pratima Pandey
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Zhi-Rong Ruan
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Maria Sevdali
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ye Bu
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Yue Lu
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Shaojun Du
- Institute of Marine and Environmental Technology, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Elizabeth H Chen
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA; Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA; Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA; Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX, USA.
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14
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Bernareggi A, Bosutti A, Massaria G, Giniatullin R, Malm T, Sciancalepore M, Lorenzon P. The State of the Art of Piezo1 Channels in Skeletal Muscle Regeneration. Int J Mol Sci 2022; 23:ijms23126616. [PMID: 35743058 PMCID: PMC9224226 DOI: 10.3390/ijms23126616] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 06/10/2022] [Accepted: 06/11/2022] [Indexed: 02/07/2023] Open
Abstract
Piezo1 channels are highly mechanically-activated cation channels that can sense and transduce the mechanical stimuli into physiological signals in different tissues including skeletal muscle. In this focused review, we summarize the emerging evidence of Piezo1 channel-mediated effects in the physiology of skeletal muscle, with a particular focus on the role of Piezo1 in controlling myogenic precursor activity and skeletal muscle regeneration and vascularization. The disclosed effects reported by pharmacological activation of Piezo1 channels with the selective agonist Yoda1 indicate a potential impact of Piezo1 channel activity in skeletal muscle regeneration, which is disrupted in various muscular pathological states. All findings reported so far agree with the idea that Piezo1 channels represent a novel, powerful molecular target to develop new therapeutic strategies for preventing or ameliorating skeletal muscle disorders characterized by an impairment of tissue regenerative potential.
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Affiliation(s)
- Annalisa Bernareggi
- Department of Life Sciences, University of Trieste, 34127 Trieste, Italy; (A.B.); (G.M.); (M.S.); (P.L.)
- Correspondence:
| | - Alessandra Bosutti
- Department of Life Sciences, University of Trieste, 34127 Trieste, Italy; (A.B.); (G.M.); (M.S.); (P.L.)
| | - Gabriele Massaria
- Department of Life Sciences, University of Trieste, 34127 Trieste, Italy; (A.B.); (G.M.); (M.S.); (P.L.)
| | - Rashid Giniatullin
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (R.G.); (T.M.)
| | - Tarja Malm
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, 70211 Kuopio, Finland; (R.G.); (T.M.)
| | - Marina Sciancalepore
- Department of Life Sciences, University of Trieste, 34127 Trieste, Italy; (A.B.); (G.M.); (M.S.); (P.L.)
| | - Paola Lorenzon
- Department of Life Sciences, University of Trieste, 34127 Trieste, Italy; (A.B.); (G.M.); (M.S.); (P.L.)
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15
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Ramirez-Martinez A, Zhang Y, van den Boogaard MJ, McAnally JR, Rodriguez-Caycedo C, Chai AC, Chemello F, Massink MP, Cuppen I, Elferink MG, van Es RJ, Janssen NG, Walraven-van Oijen LP, Liu N, Bassel-Duby R, van Jaarsveld RH, Olson EN. Impaired activity of the fusogenic micropeptide Myomixer causes myopathy resembling Carey-Fineman-Ziter syndrome. J Clin Invest 2022; 132:e159002. [PMID: 35642635 PMCID: PMC9151691 DOI: 10.1172/jci159002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 04/21/2022] [Indexed: 01/19/2023] Open
Abstract
Skeletal muscle fibers contain hundreds of nuclei, which increase the overall transcriptional activity of the tissue and perform specialized functions. Multinucleation occurs through myoblast fusion, mediated by the muscle fusogens Myomaker (MYMK) and Myomixer (MYMX). We describe a human pedigree harboring a recessive truncating variant of the MYMX gene that eliminates an evolutionarily conserved extracellular hydrophobic domain of MYMX, thereby impairing fusogenic activity. Homozygosity of this human variant resulted in a spectrum of abnormalities that mimicked the clinical presentation of Carey-Fineman-Ziter syndrome (CFZS), caused by hypomorphic MYMK variants. Myoblasts generated from patient-derived induced pluripotent stem cells displayed defective fusion, and mice bearing the human MYMX variant died perinatally due to muscle abnormalities. In vitro assays showed that the human MYMX variant conferred minimal cell-cell fusogenicity, which could be restored with CRISPR/Cas9-mediated base editing, thus providing therapeutic potential for this disorder. Our findings identify MYMX as a recessive, monogenic human disease gene involved in CFZS, and provide new insights into the contribution of myoblast fusion to neuromuscular diseases.
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Affiliation(s)
- Andres Ramirez-Martinez
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Yichi Zhang
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | | | - John R. McAnally
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Cristina Rodriguez-Caycedo
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Andreas C. Chai
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Francesco Chemello
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | | | | | | | - Robert J.J. van Es
- Department of Oral and Maxillofacial Surgery, University Medical Center Utrecht, Utrecht, Netherlands
| | - Nard G. Janssen
- Department of Oral and Maxillofacial Surgery, University Medical Center Utrecht, Utrecht, Netherlands
| | | | - Ning Liu
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Rhonda Bassel-Duby
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | | | - Eric N. Olson
- Department of Molecular Biology and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
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16
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Abstract
Symmetry of the face is one of the most important features for the perception of attractiveness. Asymmetry of the face means that the right and left sides of the face are not identical. Subclinical facial asymmetry is very common in the general population. Most people have some slight facial asymmetry, and this is the normal biological situation in humans. Abnormalities from soft tissue, dental, and skeletal elements lead to facial asymmetry. Asymmetry has many causal factors, and its aetiology includes both congenital and acquired conditions. Neurological facial asymmetry is scarcely addressed in the dental literature. In this narrative review, we focus on the most common neurological causes of facial asymmetry. From a neurological point of view, facial asymmetry can result from disturbances of the cranial nerves, developmental disorders, or myopathies. In the broad range of differential diagnostics of facial asymmetry, neurological abnormalities should be taken into consideration. The treatment must be related to the underlying cause. Complete knowledge of the aetiological factors and the character of the asymmetry plays a crucial role in formulating a treatment plan.
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17
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Regulation of the myoblast fusion reaction for muscle development, regeneration, and adaptations. Exp Cell Res 2022; 415:113134. [PMID: 35367215 DOI: 10.1016/j.yexcr.2022.113134] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 02/23/2022] [Accepted: 03/28/2022] [Indexed: 12/27/2022]
Abstract
Fusion of plasma membranes is essential for skeletal muscle development, regeneration, exercise-induced adaptations, and results in a cell that contains hundreds to thousands of nuclei within a shared cytoplasm. The differentiation process in myocytes culminates in their fusion to form a new myofiber or fusion to an existing myofiber thereby contributing more synthetic material to the syncytium. The choice for two cells to fuse and become one could be a dangerous event if the two cells are not committed to an allied function. Thus, fusion events are highly regulated with positive and negative factors to fine-tune the process, and requires muscle-specific fusogens (Myomaker and Myomerger) as well as general cellular machinery to achieve the union of membranes. While a unified vertebrate myoblast fusion pathway is not yet established, recent discoveries should make this pursuit attainable. Not only does myocyte fusion impact the normal biology of skeletal muscle, but new evidence indicates dysregulation of the process impacts pathologies of skeletal muscle. Here, I will highlight the molecular players and biochemical mechanisms that drive fusion events in muscle, and discuss how this key myogenic process impacts skeletal muscle diseases.
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18
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Mohassel P, Chang N, Inoue K, Delaney A, Hu Y, Donkervoort S, Saade D, Billioux BJ, Meader B, Volochayev R, Konersman CG, Kaindl AM, Cho CH, Russell B, Rodriguez A, Foster KW, Foley AR, Moore SA, Jones PL, Bonnemann CG, Jones T, Shaw ND. Cross-sectional, Neuromuscular Phenotyping Study of Arhinia Patients With SMCHD1 Variants. Neurology 2022; 98:e1384-e1396. [PMID: 35121673 PMCID: PMC8967428 DOI: 10.1212/wnl.0000000000200032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 12/30/2021] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Facioscapulohumeral muscular dystrophy type 2 (FSHD2) and arhinia are two distinct disorders caused by pathogenic variants in the same gene, SMCHD1. The mechanism underlying this phenotypic divergence remains unclear. In this study, we characterize the neuromuscular phenotype of individuals with arhinia caused by SMCHD1 variants and analyze their complex genetic and epigenetic criteria to assess their risk for FSHD2. METHODS Eleven individuals with congenital nasal anomalies, including arhinia, nasal hypoplasia, or anosmia, underwent a neuromuscular exam, genetic testing, muscle ultrasound, and muscle MRI. Risk for FSHD2 was determined by combined genetic and epigenetic analysis of 4q35 haplotype, D4Z4 repeat length and methylation profile. We also compared expression levels of pathogenic DUX4 mRNA in primary myoblasts or dermal fibroblasts (upon myogenic differentiation or epigenetic transdifferentiation, respectively) in these individuals to those with confirmed FSHD2. RESULTS Among the eleven individuals with rare, pathogenic, heterozygous missense variants in exons 3-11 of SMCHD1, only a subset (n=3/11; 1 male, 2 females; age 25-51 years) met the strict genetic and epigenetic criteria for FSHD2 (D4Z4 repeat unit length <21 in cis with a 4qA haplotype, and D4Z4 methylation <30%). None of the 3 individuals had typical clinical manifestations or muscle imaging findings consistent with FSHD2. However, the arhinia patients meeting the permissive genetic and epigenetic criteria for FSHD2 displayed some DUX4 expression in dermal fibroblasts under the epigenetic de-repression by drug treatment and in the primary myoblasts undergoing myogenic differentiation. DISCUSSION In this cross-sectional study, we identified arhinia patients who meet the full genetic and epigenetic criteria for FSHD2 and display the molecular hallmark of FSHD, that is DUX4 de-repression and expression in vitro, but who do not manifest with the typical clinicopathologic phenotype of FSHD2. The distinct dichotomy between FSHD2 and arhinia phenotypes despite an otherwise poised DUX4 locus implies the presence of novel disease-modifying factors that seem to operate as a "switch", resulting in one phenotype and not the other. Identification and further understanding of these disease-modifying factors will likely provide valuable insight with therapeutic implications for both diseases.
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Affiliation(s)
- Payam Mohassel
- Neuromuscular and Neurogenetic Disorders of Childhood Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD
| | - Ning Chang
- Department of Pharmacology, University of Nevada, Reno School of Medicine, Reno, Nevada, USA
| | - Kaoru Inoue
- Pediatric Neuroendocrinology Group, Clinical Research Branch, National Institute of Environmental Health Sciences, National Institutes of Health, RTP, NC
| | - Angela Delaney
- National Institute of Child Health and Development, National Institutes of Health, Bethesda, MD
| | - Ying Hu
- Neuromuscular and Neurogenetic Disorders of Childhood Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD
| | - Sandra Donkervoort
- Neuromuscular and Neurogenetic Disorders of Childhood Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD
| | - Dimah Saade
- Neuromuscular and Neurogenetic Disorders of Childhood Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD
| | - B Jeanne Billioux
- International Neuroinfectious Diseases Unit, Division of Neuroimmunology and Neurovirology, National institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD
| | - Brooke Meader
- National Institute of Child Health and Development, National Institutes of Health, Bethesda, MD
| | - Rita Volochayev
- Environmental Autoimmunity Group, Clinical Research Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Bethesda, MD
| | | | - Angela M Kaindl
- Charitè-Universitätsmedizin Berlin, Department of Pediatric Neurology, Center for Chronically Sick Children and Institute of Cell Biology and Neurobiology, Berlin, Germany
| | - Chie-Hee Cho
- Institute for diagnostic and interventional Radiology, University Clinic, Jena, Germany
| | - Bianca Russell
- Division of Pediatric Genetics, Department of Pediatrics, University of California, Los Angeles, Los Angeles, CA
| | | | - K Wade Foster
- Florida Dermatology and Skin Cancer Centers, Winter Haven, FL
| | - A Reghan Foley
- Neuromuscular and Neurogenetic Disorders of Childhood Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD
| | - Steven A Moore
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Peter L Jones
- Department of Pharmacology, University of Nevada, Reno School of Medicine, Reno, Nevada, USA
| | - Carsten G Bonnemann
- Neuromuscular and Neurogenetic Disorders of Childhood Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD
| | - Takako Jones
- Department of Pharmacology, University of Nevada, Reno School of Medicine, Reno, Nevada, USA
| | - Natalie D Shaw
- Pediatric Neuroendocrinology Group, Clinical Research Branch, National Institute of Environmental Health Sciences, National Institutes of Health, RTP, NC
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19
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Ganassi M, Muntoni F, Zammit PS. Defining and identifying satellite cell-opathies within muscular dystrophies and myopathies. Exp Cell Res 2022; 411:112906. [PMID: 34740639 PMCID: PMC8784828 DOI: 10.1016/j.yexcr.2021.112906] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 10/12/2021] [Accepted: 10/29/2021] [Indexed: 12/19/2022]
Abstract
Muscular dystrophies and congenital myopathies arise from specific genetic mutations causing skeletal muscle weakness that reduces quality of life. Muscle health relies on resident muscle stem cells called satellite cells, which enable life-course muscle growth, maintenance, repair and regeneration. Such tuned plasticity gradually diminishes in muscle diseases, suggesting compromised satellite cell function. A central issue however, is whether the pathogenic mutation perturbs satellite cell function directly and/or indirectly via an increasingly hostile microenvironment as disease progresses. Here, we explore the effects on satellite cell function of pathogenic mutations in genes (myopathogenes) that associate with muscle disorders, to evaluate clinical and muscle pathological hallmarks that define dysfunctional satellite cells. We deploy transcriptomic analysis and comparison between muscular dystrophies and myopathies to determine the contribution of satellite cell dysfunction using literature, expression dynamics of myopathogenes and their response to the satellite cell regulator PAX7. Our multimodal approach extends current pathological classifications to define Satellite Cell-opathies: muscle disorders in which satellite cell dysfunction contributes to pathology. Primary Satellite Cell-opathies are conditions where mutations in a myopathogene directly affect satellite cell function, such as in Progressive Congenital Myopathy with Scoliosis (MYOSCO) and Carey-Fineman-Ziter Syndrome (CFZS). Primary satellite cell-opathies are generally characterised as being congenital with general hypotonia, and specific involvement of respiratory, trunk and facial muscles, although serum CK levels are usually within the normal range. Secondary Satellite Cell-opathies have mutations in myopathogenes that affect both satellite cells and muscle fibres. Such classification aids diagnosis and predicting probable disease course, as well as informing on treatment and therapeutic development.
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Affiliation(s)
- Massimo Ganassi
- Randall Centre for Cell and Molecular Biophysics, King's College London, London, SE1 1UL, UK.
| | - Francesco Muntoni
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London, WC1N 1EH, United Kingdom; NIHR Great Ormond Street Hospital Biomedical Research Centre, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London, WC1N 1EH, United Kingdom
| | - Peter S Zammit
- Randall Centre for Cell and Molecular Biophysics, King's College London, London, SE1 1UL, UK.
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20
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Esteves de Lima J, Blavet C, Bonnin MA, Hirsinger E, Havis E, Relaix F, Duprez D. TMEM8C-mediated fusion is regionalized and regulated by NOTCH signalling during foetal myogenesis. Development 2022; 149:274065. [PMID: 35005776 DOI: 10.1242/dev.199928] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 12/15/2021] [Indexed: 12/30/2022]
Abstract
The location and regulation of fusion events within skeletal muscles during development remain unknown. Using the fusion marker myomaker (Mymk), named TMEM8C in chicken, as a readout of fusion, we identified a co-segregation of TMEM8C-positive cells and MYOG-positive cells in single-cell RNA-sequencing datasets of limbs from chicken embryos. We found that TMEM8C transcripts, MYOG transcripts and the fusion-competent MYOG-positive cells were preferentially regionalized in central regions of foetal muscles. We also identified a similar regionalization for the gene encoding the NOTCH ligand JAG2 along with an absence of NOTCH activity in TMEM8C+ fusion-competent myocytes. NOTCH function in myoblast fusion had not been addressed so far. We analysed the consequences of NOTCH inhibition for TMEM8C expression and myoblast fusion during foetal myogenesis in chicken embryos. NOTCH inhibition increased myoblast fusion and TMEM8C expression and released the transcriptional repressor HEYL from the TMEM8C regulatory regions. These results identify a regionalization of TMEM8C-dependent fusion and a molecular mechanism underlying the fusion-inhibiting effect of NOTCH in foetal myogenesis. The modulation of NOTCH activity in the fusion zone could regulate the flux of fusion events.
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Affiliation(s)
- Joana Esteves de Lima
- Sorbonne Université, Institut Biologie Paris Seine, CNRS UMR7622, Developmental Biology Laboratory, Inserm U1156, F-75005 Paris, France.,Univ Paris Est Creteil, INSERM, EnvA, EFS, AP-HP, IMRB, F-94010 Creteil, France
| | - Cédrine Blavet
- Sorbonne Université, Institut Biologie Paris Seine, CNRS UMR7622, Developmental Biology Laboratory, Inserm U1156, F-75005 Paris, France
| | - Marie-Ange Bonnin
- Sorbonne Université, Institut Biologie Paris Seine, CNRS UMR7622, Developmental Biology Laboratory, Inserm U1156, F-75005 Paris, France
| | - Estelle Hirsinger
- Sorbonne Université, Institut Biologie Paris Seine, CNRS UMR7622, Developmental Biology Laboratory, Inserm U1156, F-75005 Paris, France
| | - Emmanuelle Havis
- Sorbonne Université, Institut Biologie Paris Seine, CNRS UMR7622, Developmental Biology Laboratory, Inserm U1156, F-75005 Paris, France
| | - Frédéric Relaix
- Univ Paris Est Creteil, INSERM, EnvA, EFS, AP-HP, IMRB, F-94010 Creteil, France
| | - Delphine Duprez
- Sorbonne Université, Institut Biologie Paris Seine, CNRS UMR7622, Developmental Biology Laboratory, Inserm U1156, F-75005 Paris, France
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21
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Sood A, Shamim U, Kharbanda OP, Kabra M, Gupta N, Mathur A, Joshi A, Parveen S, Zahra S, Sharma P, Seth M, Khan A, Faruq M, Mishra D. Next Generation Sequencing and Cytogenetic Based Evaluation of Indian Pierre Robin Sequence Families Reveals CNV Regions of Modest Effect and a Novel LOXL3 Mutation. Cleft Palate Craniofac J 2021; 59:1329-1339. [PMID: 34787502 DOI: 10.1177/10556656211052781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Pierre Robin Sequence (PRS) affects approximately 1 per 8500 to 14000 new-borns worldwide. Although the clinical entity is well defined, the pathogenesis of PRS is debated. The present study aims to understand the contribution of genomic imbalances and genetic variants in patients clinically diagnosed of PRS. METHODOLOGY A total of 7 independent patients with nonsyndromic PRS thoroughly evaluated by a medical geneticist at a tertiary care hospital, were included in the study. Blood samples were collected from these patients and their family members. Array CGH was performed on all 7 patients and their respective family members for detection of underlying cytogenetic defects. Whole exome sequencing (WES) was performed for 5 families to capture single nucleotide variants or small indels. RESULTS Cytogenetic analyses did not detect any previously reported gross chromosomal aberrations for PRS in the patient cohort. However, copy number variations (CNVs) of size <1 Mb were detected in patients which may have implications in PRS. The present study provided evidence for the occurrence of de novo deletions at 7p14.1 locus in PRS patients: further validating the candidate loci susceptibility in oral clefts. WES data identified LOXL3 as candidate gene, carrying novel deleterious variant, which is suggestive of the role of point mutations in the pathogenesis of PRS. CONCLUSION The present study offered considerable insight into the contribution of cytogenetic defects and novel point mutation in the etiology of nonsyndromic PRS. Studies comprising large number of cases are required to fully elucidate the genetic mechanisms underlying the PRS phenotype.
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Affiliation(s)
- Anubhuti Sood
- Centre for Dental Education and Research, 28730All India Institute of Medical Sciences, Delhi, India
| | - Uzma Shamim
- Genomics and Molecular Medicine, 28840CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Om P Kharbanda
- Centre for Dental Education and Research, 28730All India Institute of Medical Sciences, Delhi, India
| | | | - Neerja Gupta
- 28730All India Institute of Medical Sciences, Delhi, India
| | - Aradhana Mathur
- Genomics and Molecular Medicine, 28840CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Aditi Joshi
- Genomics and Molecular Medicine, 28840CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Shaista Parveen
- Genomics and Molecular Medicine, 28840CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Sana Zahra
- Genomics and Molecular Medicine, 28840CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Pooja Sharma
- Genomics and Molecular Medicine, 28840CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Malika Seth
- Genomics and Molecular Medicine, 28840CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Afreen Khan
- Genomics and Molecular Medicine, 28840CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Mohammed Faruq
- Genomics and Molecular Medicine, 28840CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Deepika Mishra
- Centre for Dental Education and Research, 28730All India Institute of Medical Sciences, Delhi, India
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22
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YAP1 nuclear efflux and transcriptional reprograming follow membrane diminution upon VSV-G-induced cell fusion. Nat Commun 2021; 12:4502. [PMID: 34301937 PMCID: PMC8302681 DOI: 10.1038/s41467-021-24708-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 06/24/2021] [Indexed: 02/07/2023] Open
Abstract
Cells in many tissues, such as bone, muscle, and placenta, fuse into syncytia to acquire new functions and transcriptional programs. While it is known that fused cells are specialized, it is unclear whether cell-fusion itself contributes to programmatic-changes that generate the new cellular state. Here, we address this by employing a fusogen-mediated, cell-fusion system to create syncytia from undifferentiated cells. RNA-Seq analysis reveals VSV-G-induced cell fusion precedes transcriptional changes. To gain mechanistic insights, we measure the plasma membrane surface area after cell-fusion and observe it diminishes through increases in endocytosis. Consequently, glucose transporters internalize, and cytoplasmic glucose and ATP transiently decrease. This reduced energetic state activates AMPK, which inhibits YAP1, causing transcriptional-reprogramming and cell-cycle arrest. Impairing either endocytosis or AMPK activity prevents YAP1 inhibition and cell-cycle arrest after fusion. Together, these data demonstrate plasma membrane diminishment upon cell-fusion causes transient nutrient stress that may promote transcriptional-reprogramming independent from extrinsic cues.
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23
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Affiliation(s)
- Hannah F Dugdale
- Centre for Human and Applied Physiological Sciences, School of Basic & Medical Biosciences, Faculty of Life Sciences & Medicine, Guy's Campus, King's College London, London, United Kingdom
| | - Julien Ochala
- Centre for Human and Applied Physiological Sciences, School of Basic & Medical Biosciences, Faculty of Life Sciences & Medicine, Guy's Campus, King's College London, London, United Kingdom.,Randall Centre for Cell and Molecular Biophysics, School of Basic & Medical Biosciences, Faculty of Life Sciences & Medicine, Guy's Campus, King's College London, London, United Kingdom.,Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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24
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Costa ML, Jurberg AD, Mermelstein C. The Role of Embryonic Chick Muscle Cell Culture in the Study of Skeletal Myogenesis. Front Physiol 2021; 12:668600. [PMID: 34093232 PMCID: PMC8173222 DOI: 10.3389/fphys.2021.668600] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 04/21/2021] [Indexed: 11/13/2022] Open
Abstract
The mechanisms involved in the development of skeletal muscle fibers have been studied in the last 70 years and yet many aspects of this process are still not completely understood. A myriad of in vivo and in vitro invertebrate and vertebrate animal models has been used for dissecting the molecular and cellular events involved in muscle formation. Among the most used animal models for the study of myogenesis are the rodents rat and mouse, the fruit fly Drosophila, and the birds chicken and quail. Here, we describe the robustness and advantages of the chick primary muscle culture model for the study of skeletal myogenesis. In the myoblast culture obtained from embryonic chick pectoralis muscle it is possible to analyze all the steps involved in skeletal myogenesis, such as myoblast proliferation, withdrawal from cell cycle, cell elongation and migration, myoblast alignment and fusion, the assembly of striated myofibrils, and the formation of multinucleated myotubes. The fact that in vitro chick myotubes can harbor hundreds of nuclei, whereas myotubes from cell lines have only a dozen nuclei demonstrates the high level of differentiation of the autonomous chick myogenic program. This striking differentiation is independent of serum withdrawal, which points to the power of the model. We also review the major pro-myogenic and anti-myogenic molecules and signaling pathways involved in chick myogenesis, in addition to providing a detailed protocol for the preparation of embryonic chick myogenic cultures. Moreover, we performed a bibliometric analysis of the articles that used this model to evaluate which were the main explored topics of interest and their contributors. We expect that by describing the major findings, and their advantages, of the studies using the embryonic chick myogenic model we will foster new studies on the molecular and cellular process involved in muscle proliferation and differentiation that are more similar to the actual in vivo condition than the muscle cell lines.
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Affiliation(s)
- Manoel L Costa
- Laboratório de Diferenciação Muscular, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Arnon D Jurberg
- Laboratório de Diferenciação Muscular, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,Faculdade de Medicina-Presidente Vargas, Universidade Estácio de Sá, Rio de Janeiro, Brazil
| | - Claudia Mermelstein
- Laboratório de Diferenciação Muscular, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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25
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Webb BD, Manoli I, Engle EC, Jabs EW. A framework for the evaluation of patients with congenital facial weakness. Orphanet J Rare Dis 2021; 16:158. [PMID: 33827624 PMCID: PMC8028830 DOI: 10.1186/s13023-021-01736-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 02/10/2021] [Indexed: 11/10/2022] Open
Abstract
There is a broad differential for patients presenting with congenital facial weakness, and initial misdiagnosis unfortunately is common for this phenotypic presentation. Here we present a framework to guide evaluation of patients with congenital facial weakness disorders to enable accurate diagnosis. The core categories of causes of congenital facial weakness include: neurogenic, neuromuscular junction, myopathic, and other. This diagnostic algorithm is presented, and physical exam considerations, additional follow-up studies and/or consultations, and appropriate genetic testing are discussed in detail. This framework should enable clinical geneticists, neurologists, and other rare disease specialists to feel prepared when encountering this patient population and guide diagnosis, genetic counseling, and clinical care.
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Affiliation(s)
- Bryn D Webb
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA. .,Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
| | - Irini Manoli
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Elizabeth C Engle
- Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.,Department of Ophthalmology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.,Howard Hughes Medical Institute, Chevy Chase, MD, USA
| | - Ethylin W Jabs
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.,Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
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26
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Camacho A, Martínez B, Alvarez S, Gil-Fournier B, Ramiro S, Hernández-Laín A, Núñez N, Simón R. Carey-Fineman-Ziter Syndrome: A MYMK-Related Myopathy Mimicking Brainstem Dysgenesis. J Neuromuscul Dis 2021; 7:309-313. [PMID: 32333597 DOI: 10.3233/jnd-200477] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Carey-Fineman-Ziter syndrome is a congenital myopathy associated with mutations in the MYMK gene. It is clinically defined by the combination of hypotonia, Moebius-Robin sequence, facial anomalies and motor delay. Historically it was considered a brainstem dysgenesis syndrome. We provide detailed information of a Spanish boy with compound heterozygous variants in MYMK gene. A muscle biopsy performed as a toddler only disclosed minimal changes, but muscle MRI showed severe fatty infiltration of gluteus muscles and to a lesser extent in adductors magnus, sartorius and soleus muscles. Clinical course is fairly static, but the identification of new well characterized genetic cases will help to delineate the complete phenotype.
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Affiliation(s)
- Ana Camacho
- Sección Neurología Infantil, Servicio de Neurología, Hospital Universitario 12 de Octubre, Universidad Complutense de Madrid, Spain
| | - Beatriz Martínez
- Unidad Neurología Infantil, Hospital Universitario de Getafe, Spain
| | | | | | - Soraya Ramiro
- Unidad de Genética, Hospital Universitario de Getafe, Spain
| | - Aurelio Hernández-Laín
- Sección Neuropatología, Servicio de Anatomía Patológica, Hospital Universitario 12 de Octubre de Madrid, Spain
| | - Noemí Núñez
- Sección Neurología Infantil, Servicio de Neurología, Hospital Universitario 12 de Octubre, Universidad Complutense de Madrid, Spain
| | - Rogelio Simón
- Sección Neurología Infantil, Servicio de Neurología, Hospital Universitario 12 de Octubre, Universidad Complutense de Madrid, Spain
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27
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Rodríguez-Pérez F, Manford AG, Pogson A, Ingersoll AJ, Martínez-González B, Rape M. Ubiquitin-dependent remodeling of the actin cytoskeleton drives cell fusion. Dev Cell 2021; 56:588-601.e9. [PMID: 33609460 DOI: 10.1016/j.devcel.2021.01.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 11/14/2020] [Accepted: 01/24/2021] [Indexed: 12/11/2022]
Abstract
Cell-cell fusion is a frequent and essential event during development, and its dysregulation causes diseases ranging from infertility to muscle weakness. Fusing cells need to repeatedly remodel their plasma membrane through orchestrated formation and disassembly of actin filaments, but how the dynamic reorganization of the cortical actin cytoskeleton is controlled is still poorly understood. Here, we identified a ubiquitin-dependent toggle switch that establishes reversible actin bundling during mammalian cell fusion. We found that EPS8-IRSp53 complexes stabilize cortical actin bundles at sites of cell contact to promote close membrane alignment. EPS8 monoubiquitylation by CUL3KCTD10 displaces EPS8-IRSp53 from membranes and counteracts actin bundling, a dual activity that restricts actin bundling to allow paired cells to progress with fusion. We conclude that cytoskeletal rearrangements during development are precisely controlled by ubiquitylation, raising the possibility of modulating the efficiency of cell-cell fusion for therapeutic benefit.
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Affiliation(s)
- Fernando Rodríguez-Pérez
- Howard Hughes Medical Institute, University of California at Berkeley, Berkeley, CA 94720, USA; Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Andrew G Manford
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Angela Pogson
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Andrew J Ingersoll
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Brenda Martínez-González
- Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Michael Rape
- Howard Hughes Medical Institute, University of California at Berkeley, Berkeley, CA 94720, USA; Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA.
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28
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Lehky T, Joseph R, Toro C, Wu T, Van Ryzin C, Gropman A, Facio FM, Webb BD, Jabs EW, Barry BS, Engle EC, Collins FS, Manoli I. Differentiating Moebius syndrome and other congenital facial weakness disorders with electrodiagnostic studies. Muscle Nerve 2021; 63:516-524. [PMID: 33389762 DOI: 10.1002/mus.27159] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 12/18/2020] [Accepted: 12/24/2020] [Indexed: 01/11/2023]
Abstract
INTRODUCTION Congenital facial weakness (CFW) can result from facial nerve paresis with or without other cranial nerve and systemic involvement, or generalized neuropathic and myopathic disorders. Moebius syndrome is one type of CFW. In this study we explored the utility of electrodiagnostic studies (EDx) in the evaluation of individuals with CFW. METHODS Forty-three subjects enrolled prospectively into a dedicated clinical protocol and had EDx evaluations, including blink reflex and facial and peripheral nerve conduction studies, with optional needle electromyography. RESULTS MBS and hereditary congenital facial paresis (HCFP) subjects had low-amplitude cranial nerve 7 responses without other neuropathic or myopathic findings. Carriers of specific pathogenic variants in TUBB3 had, in addition, a generalized sensorimotor axonal polyneuropathy with demyelinating features. Myopathic findings were detected in individuals with Carey-Fineman-Ziter syndrome, myotonic dystrophy, other undefined myopathies, or CFW with arthrogryposis, ophthalmoplegia, and other system involvement. DISCUSSION EDx in CFW subjects can assist in characterizing the underlying pathogenesis, as well as guide diagnosis and genetic counseling.
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Affiliation(s)
- Tanya Lehky
- EMG Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, USA
| | - Reversa Joseph
- EMG Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, USA.,Chalmers P. Wylie Veterans Administration, Columbus, Ohio, USA
| | - Camilo Toro
- Undiagnosed Disease Program, OCD, NHGRI, NIH, Bethesda, Maryland, USA
| | - Tianxia Wu
- Clinical Trials Unit, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, USA
| | - Carol Van Ryzin
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Andrea Gropman
- Neurodevelopmental Pediatrics and Neurogenetics, Children's National Medical Center, Washington, District of Columbia, USA
| | - Flavia M Facio
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Bryn D Webb
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Ethylin W Jabs
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Brenda S Barry
- Department of Neurology, Boston Children's Hospital, Boston, Massachusetts, USA.,Howard Hughes Medical Institute, Chevy Chase, Maryland, USA
| | - Elizabeth C Engle
- Department of Neurology, Boston Children's Hospital, Boston, Massachusetts, USA.,Howard Hughes Medical Institute, Chevy Chase, Maryland, USA.,Department of Ophthalmology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Francis S Collins
- Medical Genomics and Metabolic Genetics Branch, Immediate Office of the Director, National Institutes of Health, Bethesda, Maryland, USA
| | - Irini Manoli
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA
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29
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Zhang H, Wen J, Bigot A, Chen J, Shang R, Mouly V, Bi P. Human myotube formation is determined by MyoD-Myomixer/Myomaker axis. SCIENCE ADVANCES 2020; 6:6/51/eabc4062. [PMID: 33355126 DOI: 10.1126/sciadv.abc4062] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 10/27/2020] [Indexed: 06/12/2023]
Abstract
Myoblast fusion is essential for formations of myofibers, the basic cellular and functional units of skeletal muscles. Recent genetic studies in mice identified two long-sought membrane proteins, Myomaker and Myomixer, which cooperatively drive myoblast fusion. It is unknown whether and how human muscles, with myofibers of tremendously larger size, use this mechanism to achieve multinucleations. Here, we report an interesting fusion model of human myoblasts where Myomaker is sufficient to induce low-grade fusion, while Myomixer boosts its efficiency to generate giant myotubes. By CRISPR mutagenesis and biochemical assays, we identified MyoD as the key molecular switch of fusion that is required and sufficient to initiate Myomixer and Myomaker expression. Mechanistically, we defined the E-box motifs on promoters of Myomixer and Myomaker by which MyoD induces their expression for multinucleations of human muscle cells. Together, our study uncovered the key molecular apparatus and the transcriptional control mechanism underlying human myoblast fusion.
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Affiliation(s)
- Haifeng Zhang
- Center for Molecular Medicine, University of Georgia, Athens, GA 30602, USA
| | - Junfei Wen
- Center for Molecular Medicine, University of Georgia, Athens, GA 30602, USA
| | - Anne Bigot
- Center for Research in Myology UMRS974, Sorbonne Université, INSERM, Myology Institute AIM, Paris, France
| | - Jiacheng Chen
- Center for Molecular Medicine, University of Georgia, Athens, GA 30602, USA
| | - Renjie Shang
- Center for Molecular Medicine, University of Georgia, Athens, GA 30602, USA
- Department of Genetics, University of Georgia, Athens, GA 30602, USA
| | - Vincent Mouly
- Center for Research in Myology UMRS974, Sorbonne Université, INSERM, Myology Institute AIM, Paris, France
| | - Pengpeng Bi
- Center for Molecular Medicine, University of Georgia, Athens, GA 30602, USA.
- Department of Genetics, University of Georgia, Athens, GA 30602, USA
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30
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Baldelli I, Baccarani A, Barone C, Bedeschi F, Bianca S, Calabrese O, Castori M, Catena N, Corain M, Costanzo S, Barbato GDP, De Stefano S, Divizia MT, Feletti F, Formica M, Lando M, Lerone M, Lorenzetti F, Martinoli C, Mellini L, Nava MB, Porcellini G, Puliti A, Romanini MV, Rondoni F, Santi P, Sartini S, Senes F, Spada L, Tarani L, Valle M, Venturino C, Zaottini F, Torre M, Crimi M. Consensus based recommendations for diagnosis and medical management of Poland syndrome (sequence). Orphanet J Rare Dis 2020; 15:201. [PMID: 32758259 PMCID: PMC7405453 DOI: 10.1186/s13023-020-01481-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 07/26/2020] [Indexed: 01/08/2023] Open
Abstract
Background Poland syndrome (OMIM: 173800) is a disorder in which affected individuals are born with missing or underdeveloped muscles on one side of the body, resulting in abnormalities that can affect the chest, breast, shoulder, arm, and hand. The extent and severity of the abnormalities vary among affected individuals. Main body The aim of this work is to provide recommendations for the diagnosis and management of people affected by Poland syndrome based on evidence from literature and experience of health professionals from different medical backgrounds who have followed for several years affected subjects. The literature search was performed in the second half of 2019. Original papers, meta-analyses, reviews, books and guidelines were reviewed and final recommendations were reached by consensus. Conclusion Being Poland syndrome a rare syndrome most recommendations here presented are good clinical practice based on the consensus of the participant experts.
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Affiliation(s)
- Ilaria Baldelli
- Policlinico San Martino Hospital IRCCS for Oncology, Genoa, Italy.,Associazione Italiana Sindrome Poland, Via Asiago, 3r, 16137, Genoa, Italy
| | - Alessio Baccarani
- Department of Medical and Surgical Sciences for Children and Adults, University Hospital of Modena, Modena, Italy
| | - Chiara Barone
- Medical Genetics, Referral Centre for Rare Genetic Diseases, ARNAS Garibaldi, Catania, Italy
| | - Francesca Bedeschi
- Clinical Genetics Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Sebastiano Bianca
- Medical Genetics, Referral Centre for Rare Genetic Diseases, ARNAS Garibaldi, Catania, Italy
| | - Olga Calabrese
- Medical Genetic Unit, University Hospital of Modena, Modena, Italy
| | - Marco Castori
- Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo della Sofferenza, San Giovanni Rotondo, Foggia, Italy
| | - Nunzio Catena
- Pediatric Orthopedic and Traumatology Unit Azienda Ospedalieria SS Antonio e Biagio e Cesare Arrigo, Alessandria, Italy
| | - Massimo Corain
- Hand Surgery Unit - Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Sara Costanzo
- Pediatric Surgery Unit, V. Buzzi Children's Hospital, Milan, Italy
| | | | - Santa De Stefano
- Associazione Italiana Sindrome Poland, Via Asiago, 3r, 16137, Genoa, Italy
| | | | - Francesco Feletti
- Department of Diagnostic Imaging AUSL of Romagna, U.O. of Radiology, "Santa Maria delle Croci" Civil Hospital, Ravenna, Italy
| | - Matteo Formica
- Orthopedic Clinic, Department of Surgical Sciences, University of Genova, Ospedale Policlinico San Martino, Genoa, Italy
| | - Mario Lando
- Department of Muscle-Skeletal Surgery, Hand and Microsurgery Division, Modena University Hospital, Modena, Italy
| | - Margherita Lerone
- Medical Genetics Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Fulvio Lorenzetti
- Plastic and Reconstructive Surgery Unit, University of Pisa, Santa Chiara Hospital, Pisa, Italy
| | - Carlo Martinoli
- Department of Health Science, Section of Radiology, University of Genoa, Genoa, Italy
| | - Lorenzo Mellini
- Associazione Italiana Sindrome Poland, Via Asiago, 3r, 16137, Genoa, Italy.,Department of Morphology Surgery and Experimental Medicine, Section of Radiology, University of Ferrara, Ferrara, Italy
| | - Maurizio Bruno Nava
- G.Re.T.A. Group for Reconstructive and Therapeutic Advancements, University of Genoa, Genoa, Italy
| | - Giuseppe Porcellini
- Department of Orthopaedics and Traumatology, Modena Policlinic, Modena, Italy
| | - Aldamaria Puliti
- Medical Genetics Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy.,DiNOGMI, University of Genova, Genoa, Italy
| | - Maria Victoria Romanini
- Plastic and Reconstructive Surgery, Pediatric Surgery Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Franco Rondoni
- USL Umbria 1, Ospedale Città di Castello, Perugia, Italy
| | - Pierluigi Santi
- Policlinico San Martino Hospital IRCCS for Oncology, Genoa, Italy.,Associazione Italiana Sindrome Poland, Via Asiago, 3r, 16137, Genoa, Italy
| | - Silvana Sartini
- Hand Rehabilitation Center, Modena University Hospital, Modena, Italy
| | - Filippo Senes
- Reconstructive Surgery and Hand Surgery Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Lucia Spada
- Centro di Educazione Matrimoniale e Prematrimoniale, Genoa, Italy
| | - Luigi Tarani
- Department of Pediatrics, "Sapienza", University of Rome, Rome, Italy
| | - Maura Valle
- UOC Radiologia Neuroradiologia, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | | | - Federico Zaottini
- Department of Health Science, Section of Radiology, University of Genoa, Genoa, Italy
| | - Michele Torre
- Associazione Italiana Sindrome Poland, Via Asiago, 3r, 16137, Genoa, Italy.,Pediatric Thoracic and Airway Surgery, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Marco Crimi
- Associazione Italiana Sindrome Poland, Via Asiago, 3r, 16137, Genoa, Italy. .,Kaleidos SCS-Onlus, Scientific Office, Bergamo, Italy.
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31
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Reynolds K, Zhang S, Sun B, Garland MA, Ji Y, Zhou CJ. Genetics and signaling mechanisms of orofacial clefts. Birth Defects Res 2020; 112:1588-1634. [PMID: 32666711 DOI: 10.1002/bdr2.1754] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 06/11/2020] [Accepted: 06/15/2020] [Indexed: 12/31/2022]
Abstract
Craniofacial development involves several complex tissue movements including several fusion processes to form the frontonasal and maxillary structures, including the upper lip and palate. Each of these movements are controlled by many different factors that are tightly regulated by several integral morphogenetic signaling pathways. Subject to both genetic and environmental influences, interruption at nearly any stage can disrupt lip, nasal, or palate fusion and result in a cleft. Here, we discuss many of the genetic risk factors that may contribute to the presentation of orofacial clefts in patients, and several of the key signaling pathways and underlying cellular mechanisms that control lip and palate formation, as identified primarily through investigating equivalent processes in animal models, are examined.
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Affiliation(s)
- Kurt Reynolds
- Department of Biochemistry and Molecular Medicine, University of California Davis, School of Medicine, Sacramento, California, USA.,Institute for Pediatric Regenerative Medicine, Shriners Hospitals for Children-Northern California; University of California Davis, School of Medicine, Sacramento, California, USA.,Biochemistry, Molecular, Cellular, and Developmental Biology (BMCDB) Graduate Group, University of California, Davis, California, USA
| | - Shuwen Zhang
- Department of Biochemistry and Molecular Medicine, University of California Davis, School of Medicine, Sacramento, California, USA.,Institute for Pediatric Regenerative Medicine, Shriners Hospitals for Children-Northern California; University of California Davis, School of Medicine, Sacramento, California, USA
| | - Bo Sun
- Department of Biochemistry and Molecular Medicine, University of California Davis, School of Medicine, Sacramento, California, USA.,Institute for Pediatric Regenerative Medicine, Shriners Hospitals for Children-Northern California; University of California Davis, School of Medicine, Sacramento, California, USA
| | - Michael A Garland
- Department of Biochemistry and Molecular Medicine, University of California Davis, School of Medicine, Sacramento, California, USA.,Institute for Pediatric Regenerative Medicine, Shriners Hospitals for Children-Northern California; University of California Davis, School of Medicine, Sacramento, California, USA
| | - Yu Ji
- Department of Biochemistry and Molecular Medicine, University of California Davis, School of Medicine, Sacramento, California, USA.,Institute for Pediatric Regenerative Medicine, Shriners Hospitals for Children-Northern California; University of California Davis, School of Medicine, Sacramento, California, USA.,Biochemistry, Molecular, Cellular, and Developmental Biology (BMCDB) Graduate Group, University of California, Davis, California, USA
| | - Chengji J Zhou
- Department of Biochemistry and Molecular Medicine, University of California Davis, School of Medicine, Sacramento, California, USA.,Institute for Pediatric Regenerative Medicine, Shriners Hospitals for Children-Northern California; University of California Davis, School of Medicine, Sacramento, California, USA.,Biochemistry, Molecular, Cellular, and Developmental Biology (BMCDB) Graduate Group, University of California, Davis, California, USA
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32
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Hromowyk KJ, Talbot JC, Martin BL, Janssen PML, Amacher SL. Cell fusion is differentially regulated in zebrafish post-embryonic slow and fast muscle. Dev Biol 2020; 462:85-100. [PMID: 32165147 PMCID: PMC7225055 DOI: 10.1016/j.ydbio.2020.03.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 02/08/2020] [Accepted: 03/03/2020] [Indexed: 12/13/2022]
Abstract
Skeletal muscle fusion occurs during development, growth, and regeneration. To investigate how muscle fusion compares among different muscle cell types and developmental stages, we studied muscle cell fusion over time in wild-type, myomaker (mymk), and jam2a mutant zebrafish. Using live imaging, we show that embryonic myoblast elongation and fusion correlate tightly with slow muscle cell migration. In wild-type embryos, only fast muscle fibers are multinucleate, consistent with previous work showing that the cell fusion regulator gene mymk is specifically expressed throughout the embryonic fast muscle domain. However, by 3 weeks post-fertilization, slow muscle fibers also become multinucleate. At this late-larval stage, mymk is not expressed in muscle fibers, but is expressed in small cells near muscle fibers. Although previous work showed that both mymk and jam2a are required for embryonic fast muscle cell fusion, we observe that muscle force and function is almost normal in mymk and jam2a mutant embryos, despite the lack of fast muscle multinucleation. We show that genetic requirements change post-embryonically, with jam2a becoming much less important by late-larval stages and mymk now required for muscle fusion and growth in both fast and slow muscle cell types. Correspondingly, adult mymk mutants perform poorly in sprint and endurance tests compared to wild-type and jam2a mutants. We show that adult mymk mutant muscle contains small mononucleate myofibers with average myonuclear domain size equivalent to that in wild type adults. The mymk mutant fibers have decreased Laminin expression and increased numbers of Pax7-positive cells, suggesting that impaired fiber growth and active regeneration contribute to the muscle phenotype. Our findings identify several aspects of muscle fusion that change with time in slow and fast fibers as zebrafish develop beyond embryonic stages.
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Affiliation(s)
- Kimberly J Hromowyk
- Department of Molecular Genetics and Biological Chemistry and Pharmacology, The Ohio State University, Columbus, OH, 43210, USA; Center for Muscle Health and Neuromuscular Disorders, The Ohio State University and Nationwide Children's Hospital, Columbus, OH, 43210, USA; Molecular, Cellular, and Developmental Biology Graduate Program, The Ohio State University, Columbus, OH, 43210, USA
| | - Jared C Talbot
- Department of Molecular Genetics and Biological Chemistry and Pharmacology, The Ohio State University, Columbus, OH, 43210, USA; Center for Muscle Health and Neuromuscular Disorders, The Ohio State University and Nationwide Children's Hospital, Columbus, OH, 43210, USA.
| | - Brit L Martin
- Center for Muscle Health and Neuromuscular Disorders, The Ohio State University and Nationwide Children's Hospital, Columbus, OH, 43210, USA; Molecular, Cellular, and Developmental Biology Graduate Program, The Ohio State University, Columbus, OH, 43210, USA; Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH, 43210, USA
| | - Paul M L Janssen
- Center for Muscle Health and Neuromuscular Disorders, The Ohio State University and Nationwide Children's Hospital, Columbus, OH, 43210, USA; Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH, 43210, USA; Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, 43210, USA
| | - Sharon L Amacher
- Department of Molecular Genetics and Biological Chemistry and Pharmacology, The Ohio State University, Columbus, OH, 43210, USA; Center for Muscle Health and Neuromuscular Disorders, The Ohio State University and Nationwide Children's Hospital, Columbus, OH, 43210, USA; Center for RNA Biology, The Ohio State University, Columbus, OH, 43210, USA.
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33
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Yanay N, Rabie M, Nevo Y. Impaired Regeneration in Dystrophic Muscle-New Target for Therapy. Front Mol Neurosci 2020; 13:69. [PMID: 32523512 PMCID: PMC7261890 DOI: 10.3389/fnmol.2020.00069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 04/08/2020] [Indexed: 12/13/2022] Open
Abstract
Muscle stem cells (MuSCs), known as satellite cells (SCs) have an incredible ability to regenerate, which enables the maintenance and growth of muscle tissue. In response to damaging stimuli, SCs are activated, proliferate, differentiate, and fuse to repair or generate a new muscle fiber. However, dystrophic muscles are characterized by poor muscle regeneration along with chronic inflammation and fibrosis. Indications for SC involvement in muscular dystrophy pathologies are accumulating, but their contribution to muscle pathophysiology is not precisely understood. In congenital muscular dystrophy type 1A (LAMA2-CMD), mutations in Lama2 gene cause either complete or partial absence in laminin-211 protein. Laminin-211 functions as a link between muscle extracellular matrix (ECM) and two adhesion systems in the sarcolemma; one is the well-known dystrophin-glycoprotein complex (DGC), and the second is the integrin complex. Because of its protein interactions and location, laminin-211 has a crucial role in muscle function and survival by maintaining sarcolemma integrity. In addition, laminin-211 is expressed in SCs and suggested to have a role in SC proliferation and differentiation. Downstream to the primary defect in laminin-211, several secondary genes and pathways accelerate disease mechanism, while at the same time there are unsuccessful attempts to regenerate as compensation for the dystrophic process. Lately, next-generation sequencing platforms have advanced our knowledge about the secondary events occurring in various diseases, elucidate the pathophysiology, and characterize new essential targets for development of new treatment strategies. This review will mainly focus on SC contribution to impaired regeneration in muscular dystrophies and specifically new findings suggesting SC involvement in LAMA2-CMD pathology.
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Affiliation(s)
- Nurit Yanay
- Felsenstein Medical Research Center (FMRC), Tel-Aviv University, Tel-Aviv, Israel.,Institute of Neurology, Schneider Children's Medical Center, Tel-Aviv University, Tel-Aviv, Israel
| | - Malcolm Rabie
- Felsenstein Medical Research Center (FMRC), Tel-Aviv University, Tel-Aviv, Israel.,Institute of Neurology, Schneider Children's Medical Center, Tel-Aviv University, Tel-Aviv, Israel
| | - Yoram Nevo
- Felsenstein Medical Research Center (FMRC), Tel-Aviv University, Tel-Aviv, Israel.,Institute of Neurology, Schneider Children's Medical Center, Tel-Aviv University, Tel-Aviv, Israel
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34
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Lian YL, Chen KW, Chou YT, Ke TL, Chen BC, Lin YC, Chen L. PIP3 depletion rescues myoblast fusion defects in human rhabdomyosarcoma cells. J Cell Sci 2020; 133:jcs240325. [PMID: 32220979 DOI: 10.1242/jcs.240325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 03/10/2020] [Indexed: 11/20/2022] Open
Abstract
Myoblast fusion is required for myotube formation during myogenesis, and defects in myoblast differentiation and fusion have been implicated in a number of diseases, including human rhabdomyosarcoma. Although transcriptional regulation of the myogenic program has been studied extensively, the mechanisms controlling myoblast fusion remain largely unknown. This study identified and characterized the dynamics of a distinct class of blebs, termed bubbling blebs, which are smaller than those that participate in migration. The formation of these bubbling blebs occurred during differentiation and decreased alongside a decline in phosphatidylinositol-(3,4,5)-trisphosphate (PIP3) at the plasma membrane before myoblast fusion. In a human rhabdomyosarcoma-derived (RD) cell line that exhibits strong blebbing dynamics and myoblast fusion defects, PIP3 was constitutively abundant on the membrane during myogenesis. Targeting phosphatase and tensin homolog (PTEN) to the plasma membrane reduced PIP3 levels, inhibited bubbling blebs and rescued myoblast fusion defects in RD cells. These findings highlight the differential distribution and crucial role of PIP3 during myoblast fusion and reveal a novel mechanism underlying myogenesis defects in human rhabdomyosarcoma.
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Affiliation(s)
- Yen-Ling Lian
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Kuan-Wei Chen
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yu-Ting Chou
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Ting-Ling Ke
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Bi-Chang Chen
- Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Yu-Chun Lin
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu 30013, Taiwan
- Department of Medical Science, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Linyi Chen
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu 30013, Taiwan
- Department of Medical Science, National Tsing Hua University, Hsinchu 30013, Taiwan
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35
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Chen B, You W, Wang Y, Shan T. The regulatory role of Myomaker and Myomixer-Myomerger-Minion in muscle development and regeneration. Cell Mol Life Sci 2020; 77:1551-1569. [PMID: 31642939 PMCID: PMC11105057 DOI: 10.1007/s00018-019-03341-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 10/07/2019] [Accepted: 10/10/2019] [Indexed: 12/12/2022]
Abstract
Skeletal muscle plays essential roles in motor function, energy, and glucose metabolism. Skeletal muscle formation occurs through a process called myogenesis, in which a crucial step is the fusion of mononucleated myoblasts to form multinucleated myofibers. The myoblast/myocyte fusion is triggered and coordinated in a muscle-specific way that is essential for muscle development and post-natal muscle regeneration. Many molecules and proteins have been found and demonstrated to have the capacity to regulate the fusion of myoblast/myocytes. Interestingly, two newly discovered muscle-specific membrane proteins, Myomaker and Myomixer (also called Myomerger and Minion), have been identified as fusogenic regulators in vertebrates. Both Myomaker and Myomixer-Myomerger-Minion have the capacity to directly control the myogenic fusion process. Here, we review and discuss the latest studies related to these two proteins, including the discovery, structure, expression pattern, functions, and regulation of Myomaker and Myomixer-Myomerger-Minion. We also emphasize and discuss the interaction between Myomaker and Myomixer-Myomerger-Minion, as well as their cooperative regulatory roles in cell-cell fusion. Moreover, we highlight the areas for exploration of Myomaker and Myomixer-Myomerger-Minion in future studies and consider their potential application to control cell fusion for cell-therapy purposes.
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Affiliation(s)
- Bide Chen
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, China
- The Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Hangzhou, China
- Zhejiang Provincial Laboratory of Feed and Animal Nutrition, Hangzhou, China
| | - Wenjing You
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, China
- The Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Hangzhou, China
- Zhejiang Provincial Laboratory of Feed and Animal Nutrition, Hangzhou, China
| | - Yizhen Wang
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, China
- The Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Hangzhou, China
- Zhejiang Provincial Laboratory of Feed and Animal Nutrition, Hangzhou, China
| | - Tizhong Shan
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, China.
- The Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Hangzhou, China.
- Zhejiang Provincial Laboratory of Feed and Animal Nutrition, Hangzhou, China.
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36
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Sadeghi N, Hutchinson E, Van Ryzin C, FitzGibbon EJ, Butman JA, Webb BD, Facio F, Brooks BP, Collins FS, Jabs EW, Engle EC, Manoli I, Pierpaoli C. Brain phenotyping in Moebius syndrome and other congenital facial weakness disorders by diffusion MRI morphometry. Brain Commun 2020; 2:fcaa014. [PMID: 32328577 DOI: 10.1093/braincomms/fcaa014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 12/20/2019] [Accepted: 01/13/2020] [Indexed: 11/13/2022] Open
Abstract
In this study, we used a novel imaging technique, DTI (diffusion tensor imaging)-driven tensor-based morphometry, to investigate brain anatomy in subjects diagnosed with Moebius syndrome (n = 21), other congenital facial weakness disorders (n = 9) and healthy controls (n = 15). First, we selected a subgroup of subjects who satisfied the minimum diagnostic criteria for Moebius syndrome with only mild additional neurological findings. Compared to controls, in this cohort, we found a small region of highly significant volumetric reduction in the paramedian pontine reticular formation and the medial longitudinal fasciculus, important structures for the initiation and coordination of conjugate horizontal gaze. Subsequently, we tested if volume measurements from this region could help differentiate individual subjects of the different cohorts that were included in our study. We found that this region allowed discriminating Moebius syndrome subjects from congenital facial weakness disorders and healthy controls with high sensitivity (94%) and specificity (89%). Interestingly, this region was normal in congenital facial weakness subjects with oculomotor deficits of myopathic origin, who would have been classified as Moebius on the basis of purely clinical diagnostic criteria, indicating a potential role for diffusion MRI morphometry for differential diagnosis in this condition. When the entire Moebius syndrome cohort was compared to healthy controls, in addition to this 'landmark' region, other areas of significantly reduced volume in the brainstem emerged, including the location of the nuclei and fibres of cranial nerve VI (abducens nerve), and fibres of cranial nerve VII (facial nerve), and a more rostral portion of the medial longitudinal fasciculus. The high sensitivity and specificity of DTI-driven tensor-based morphometry in reliably detecting very small areas of volumetric abnormality found in this study suggest broader applications of this analysis in personalized medicine to detect hypoplasia or atrophy of small pathways and/or brainstem nuclei in other neurological disorders.
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Affiliation(s)
- Neda Sadeghi
- Quantitative Medical Imaging Section, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, USA
| | - Elizabeth Hutchinson
- Quantitative Medical Imaging Section, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, USA.,Department of Biomedical Engineering, University of Arizona, Tucson, AZ 85719, USA
| | - Carol Van Ryzin
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Edmond J FitzGibbon
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - John A Butman
- Radiology & Imaging Sciences Department, Clinical Center, National Institutes of Health, Bethesda, MD 20892, USA
| | - Bryn D Webb
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Flavia Facio
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Brian P Brooks
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Francis S Collins
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA.,Office of the Director, National Institutes of Health, Bethesda, MD 20892, USA
| | - Ethylin Wang Jabs
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Elizabeth C Engle
- Department of Neurology and Department of Ophthalmology, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA.,Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA
| | - Irini Manoli
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Carlo Pierpaoli
- Quantitative Medical Imaging Section, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, USA
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37
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Mechanisms regulating myoblast fusion: A multilevel interplay. Semin Cell Dev Biol 2020; 104:81-92. [PMID: 32063453 DOI: 10.1016/j.semcdb.2020.02.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/07/2020] [Accepted: 02/08/2020] [Indexed: 02/07/2023]
Abstract
Myoblast fusion into myotubes is one of the crucial steps of skeletal muscle development (myogenesis). The fusion is preceded by specification of a myogenic lineage (mesodermal progenitors) differentiating into myoblasts and is followed by myofiber-type specification and neuromuscular junction formation. Similarly to other processes of myogenesis, the fusion requires a very precise spatial and temporal regulation occuring both during embryonic development as well as regeneration and repair of the muscle. A plethora of genes and their products is involved in regulation of myoblast fusion and a precise multilevel interplay between them is crucial for myogenic cells to fuse. In this review, we describe both cellular events taking place during myoblast fusion (migration, adhesion, elongation, cell-cell recognition, alignment, and fusion of myoblast membranes enabling formation of myotubes) as well as recent findings on mechanisms regulating this process. Also, we present muscle disorders in humans that have been associated with defects in genes involved in regulation of myoblast fusion.
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38
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Abstract
Skeletal muscle fibres are multinucleated cells that contain postmitotic nuclei (i.e. they are no longer able to divide) and perform muscle contraction. They are formed by fusion of muscle precursor cells, and grow into elongating myofibres by the addition of further precursor cells, called satellite cells, which are also responsible for regeneration following injury. Skeletal muscle regeneration occurs in most muscular dystrophies in response to necrosis of muscle fibres. However, the complex environment within dystrophic skeletal muscle, which includes inflammatory cells, fibroblasts and fibro-adipogenic cells, together with the genetic background of the in vivo model and the muscle being studied, complicates the interpretation of laboratory studies on muscular dystrophies. Many genes are expressed in satellite cells and in other tissues, which makes it difficult to determine the molecular cause of various types of muscular dystrophies. Here, and in the accompanying poster, we discuss our current knowledge of the cellular mechanisms that govern the growth and regeneration of skeletal muscle, and highlight the defects in satellite cell function that give rise to muscular dystrophies. Summary: The mechanisms of skeletal muscle development, growth and regeneration are described. We discuss whether these processes are dysregulated in inherited muscle diseases and identify pathways that may represent therapeutic targets.
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Affiliation(s)
- Jennifer Morgan
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK .,National Institute for Health Research, Great Ormond Street Institute of Child Health Biomedical Research Centre, University College London, London WC1N 1EH, UK
| | - Terence Partridge
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK.,National Institute for Health Research, Great Ormond Street Institute of Child Health Biomedical Research Centre, University College London, London WC1N 1EH, UK.,Center for Genetic Medicine Research, Children's National Medical Center, 111 Michigan Ave NW, Washington, DC 20010, USA
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39
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Abstract
Cell-cell fusion is indispensable for creating life and building syncytial tissues and organs. Ever since the discovery of cell-cell fusion, how cells join together to form zygotes and multinucleated syncytia has remained a fundamental question in cell and developmental biology. In the past two decades, Drosophila myoblast fusion has been used as a powerful genetic model to unravel mechanisms underlying cell-cell fusion in vivo. Many evolutionarily conserved fusion-promoting factors have been identified and so has a surprising and conserved cellular mechanism. In this review, we revisit key findings in Drosophila myoblast fusion and highlight the critical roles of cellular invasion and resistance in driving cell membrane fusion.
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Affiliation(s)
- Donghoon M Lee
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA;
| | - Elizabeth H Chen
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA;
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
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40
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Petrany MJ, Millay DP. Cell Fusion: Merging Membranes and Making Muscle. Trends Cell Biol 2019; 29:964-973. [PMID: 31648852 PMCID: PMC7849503 DOI: 10.1016/j.tcb.2019.09.002] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 09/10/2019] [Accepted: 09/11/2019] [Indexed: 12/12/2022]
Abstract
Cell fusion is essential for the development of multicellular organisms, and plays a key role in the formation of various cell types and tissues. Recent findings have highlighted the varied protein machinery that drives plasma-membrane merger in different systems, which is characterized by diverse structural and functional elements. We highlight the discovery and activities of several key sets of fusion proteins that together offer an evolving perspective on cell membrane fusion. We also emphasize recent discoveries in vertebrate myoblast fusion in skeletal muscle, which is composed of numerous multinucleated myofibers formed by the fusion of progenitor cells during development.
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Affiliation(s)
- Michael J Petrany
- Division of Molecular Cardiovascular Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Douglas P Millay
- Division of Molecular Cardiovascular Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 45229, USA.
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41
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NADPH Oxidase 4 Contributes to Myoblast Fusion and Skeletal Muscle Regeneration. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:3585390. [PMID: 31827673 PMCID: PMC6885834 DOI: 10.1155/2019/3585390] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 09/24/2019] [Accepted: 10/08/2019] [Indexed: 01/28/2023]
Abstract
Myoblast fusion is an essential step in skeletal muscle development and regeneration. NADPH oxidase 4 (Nox4) regulates cellular processes such as proliferation, differentiation, and survival by producing reactive oxygen species (ROS). Insulin-like growth factor 1 induces muscle hypertrophy via Nox4, but its function in myoblast fusion remains elusive. Here, we report a ROS-dependent role of Nox4 in myoblast differentiation. Regenerating muscle fibers after injury by cardiotoxin had a lower cross-sectional area in Nox4-knockout (KO) mice than myofibers in wild-type (WT) mice. Diameters and fusion index values of myotubes differentiated from Nox4-KO primary myoblasts were significantly lower than those of myotubes derived from WT myoblasts. However, no difference was observed in the differentiation index and expression of MyoD, myogenin, and myosin heavy chain 3 (MHC) between KO and WT myotubes. The decreased fusion index was also observed during differentiation of primary myoblasts and C2C12 cells with suppressed Nox4 expression. In contrast, in C2C12 cells overexpressing Nox4, the fusion index was increased, whereas the differentiation index and MHC and myogenin protein expression were not affected compared to control. Interestingly, the expression of myomaker (Tmem8c), a fusogenic protein that controls myoblast fusion, was reduced in Nox4-knockdown C2C12 cells. The myomaker expression level was proportional to the cellular ROS level, which was regulated by of Nox4 expression level. These results suggests that Nox4 contributes to myoblast fusion, possibly through the regulation of myomaker expression via ROS production, and that Nox4-dependent ROS may promote skeletal muscle regeneration and growth.
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42
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Morgan J, Butler-Browne G, Muntoni F, Patel K. 240th ENMC workshop: The involvement of skeletal muscle stem cells in the pathology of muscular dystrophies 25-27 January 2019, Hoofddorp, The Netherlands. Neuromuscul Disord 2019; 29:704-715. [PMID: 31447279 DOI: 10.1016/j.nmd.2019.07.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 07/14/2019] [Indexed: 11/25/2022]
Affiliation(s)
- Jennifer Morgan
- University College London Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK; NIHR Great Ormond Street Hospital Biomedical Research Centre, 30 Guilford Street, London WC1N 1EH, UK.
| | - Gillian Butler-Browne
- Center for Research in Myology, Association Institut de Myologie, Inserm, Sorbonne Université, 75013 Paris, France
| | - Francesco Muntoni
- University College London Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK; NIHR Great Ormond Street Hospital Biomedical Research Centre, 30 Guilford Street, London WC1N 1EH, UK
| | - Ketan Patel
- School of Biological Sciences, University of Reading, Reading, RG6 6AS, UK.
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Abstract
PURPOSE Congenital clubfoot is a serious birth defect that affects nearly 0.1% of all births. Though there is strong evidence for a genetic basis of isolated clubfoot, aside from a handful of associations, much of the heritability remains unexplained. METHODS By systematically examining the genes involved in syndromic clubfoot, we may find new candidate genes and pathways to investigate in isolated clubfoot. RESULTS In addition to the expected enrichment of extracellular matrix and transforming growth factor beta (TGF-β) signalling genes, we find many genes involved in syndromic clubfoot encode peroxisomal matrix proteins, as well as enzymes necessary for sulfation of proteoglycans, an important part of connective tissue. Further, the association of Filamin B with isolated clubfoot as well as syndromic clubfoot is an encouraging finding. CONCLUSION We should examine these categories for enrichment in isolated clubfoot patients to increase our understanding of the underlying biology and pathophysiology of this deformity. Understanding the spectrum of syndromes that have clubfoot as a feature enables a better understanding of the underlying pathophysiology of the disorder and directs future genetic screening efforts toward certain genes and genetic pathways. LEVEL OF EVIDENCE V.
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Affiliation(s)
- B. Sadler
- Department of Neurology, Washington University in St. Louis, St Louis, Missouri, USA
| | - C. A. Gurnett
- Department of Neurology, Washington University in St. Louis, St Louis, Missouri, USA
| | - M. B. Dobbs
- Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, Missouri, USA,Correspondence should be sent to Matthew B. Dobbs, MD, 1 Children’s Place, Suite 4S-60, Department of Orthopedic Surgery, 660 S Euclid Ave, Campus Box 8233, Washington University in St Louis, St Louis, Missouri 63110, USA. E-mail:
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44
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Shi J, Cai M, Si Y, Zhang J, Du S. Knockout of myomaker results in defective myoblast fusion, reduced muscle growth and increased adipocyte infiltration in zebrafish skeletal muscle. Hum Mol Genet 2019; 27:3542-3554. [PMID: 30016436 DOI: 10.1093/hmg/ddy268] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Accepted: 07/13/2018] [Indexed: 01/08/2023] Open
Abstract
The fusion of myoblasts into multinucleated muscle fibers is vital to skeletal muscle development, maintenance and regeneration. Genetic mutations in the Myomaker (mymk) gene cause Carey-Fineman-Ziter syndrome (CFZS) in human populations. To study the regulation of mymk gene expression and function, we generated three mymk mutant alleles in zebrafish using Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) technology and analyzed the effects of mymk knockout on muscle development and growth. Our studies demonstrated that knockout of mymk resulted in defective myoblast fusion in zebrafish embryos and increased mortality at larval stage around 35-45 days post-fertilization. The viable homozygous mutants were smaller in size and weighed approximately one-third the weight of the wild type (WT) sibling at 3 months old. The homozygous mutants showed craniofacial deformities, resembling the facial defect observed in human populations with CFZS. Histological analysis revealed that skeletal muscles of mymk mutants contained mainly small-size fibers and substantial intramuscular adipocyte infiltration. Single fiber analysis revealed that myofibers in mymk mutant were predominantly single-nucleated fibers. However, myofibers with multiple myonuclei were observed, although the number of nuclei per fiber was much less compared with that in WT fibers. Overexpression of sonic Hedgehog inhibited mymk expression in zebrafish embryos and blocked myoblast fusion. Collectively, these studies demonstrated that mymk is essential for myoblast fusion during muscle development and growth.
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Affiliation(s)
- Jun Shi
- Institute of Marine and Environmental Technology, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD 21202, USA
- Department of Bioengineering and Environmental Science, Changsha University, Hunan 410003, China
| | - Mengxin Cai
- Institute of Marine and Environmental Technology, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD 21202, USA
- Institute of Sports and Exercise Biology, Shaanxi Normal University, Xi' an 710062, China
| | - Yufeng Si
- Institute of Marine and Environmental Technology, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD 21202, USA
| | - Jianshe Zhang
- Department of Bioengineering and Environmental Science, Changsha University, Hunan 410003, China
| | - Shaojun Du
- Institute of Marine and Environmental Technology, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD 21202, USA
- Department of Bioengineering and Environmental Science, Changsha University, Hunan 410003, China
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Abstract
Congenital myopathies (CM) are a large and heterogeneous group of disorders. Many new myopathies with congenital onset have recently been described phenotypically, and their molecular elucidation has rapidly ensued consecutively. CM reported between 2013 and 2017 and their corresponding gene defects have mostly been identified with modern molecular genetic techniques. Here, we report recently identified CM that have not been included in the 2017 gene table so far, of which some have been recognized with mutations in new genes and others have been recognized as variants of previously identified genes, associated with specific CM phenotypes.
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Affiliation(s)
- Josefine Radke
- Department of Neuropathology, Charité-Universitätsmedizin Berlin, Berlin, Germany.
| | - Werner Stenzel
- Department of Neuropathology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Hans H Goebel
- Department of Neuropathology, Charité-Universitätsmedizin Berlin, Berlin, Germany
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46
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Brukman NG, Uygur B, Podbilewicz B, Chernomordik LV. How cells fuse. J Cell Biol 2019; 218:1436-1451. [PMID: 30936162 PMCID: PMC6504885 DOI: 10.1083/jcb.201901017] [Citation(s) in RCA: 113] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 03/05/2019] [Accepted: 03/08/2019] [Indexed: 12/11/2022] Open
Abstract
Brukman et al. review cell–cell fusion mechanisms, focusing on the identity of the fusogens that mediate these processes and the regulation of their activities. Cell–cell fusion remains the least understood type of membrane fusion process. However, the last few years have brought about major advances in understanding fusion between gametes, myoblasts, macrophages, trophoblasts, epithelial, cancer, and other cells in normal development and in diseases. While different cell fusion processes appear to proceed via similar membrane rearrangements, proteins that have been identified as necessary and sufficient for cell fusion (fusogens) use diverse mechanisms. Some fusions are controlled by a single fusogen; other fusions depend on several proteins that either work together throughout the fusion pathway or drive distinct stages. Furthermore, some fusions require fusogens to be present on both fusing membranes, and in other fusions, fusogens have to be on only one of the membranes. Remarkably, some of the proteins that fuse cells also sculpt single cells, repair neurons, promote scission of endocytic vesicles, and seal phagosomes. In this review, we discuss the properties and diversity of the known proteins mediating cell–cell fusion and highlight their different working mechanisms in various contexts.
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Affiliation(s)
- Nicolas G Brukman
- Department of Biology, Technion-Israel Institute of Technology, Haifa, Israel
| | - Berna Uygur
- Section on Membrane Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD
| | | | - Leonid V Chernomordik
- Section on Membrane Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD
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47
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Landemaine A, Ramirez-Martinez A, Monestier O, Sabin N, Rescan PY, Olson EN, Gabillard JC. Trout myomaker contains 14 minisatellites and two sequence extensions but retains fusogenic function. J Biol Chem 2019; 294:6364-6374. [PMID: 30819805 DOI: 10.1074/jbc.ra118.006047] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 02/26/2019] [Indexed: 01/20/2023] Open
Abstract
The formation of new myofibers in vertebrates occurs by myoblast fusion and requires fusogenic activity of the muscle-specific membrane protein myomaker. Here, using in silico (BLAST) genome analyses, we show that the myomaker gene from trout includes 14 minisatellites, indicating that it has an unusual structure compared with those of other animal species. We found that the trout myomaker gene encodes a 434-amino acid (aa) protein, in accordance with its apparent molecular mass (∼40 kDa) observed by immunoblotting. The first half of the trout myomaker protein (1-220 aa) is similar to the 221-aa mouse myomaker protein, whereas the second half (222-234 aa) does not correspond to any known motifs and arises from two protein extensions. The first extension (∼70 aa) apparently appeared with the radiation of the bony fish clade Euteleostei, whereas the second extension (up to 236 aa) is restricted to the superorder Protacanthopterygii (containing salmonids and pike) and corresponds to the insertion of minisatellites having a length of 30 nucleotides. According to gene expression analyses, trout myomaker expression is consistently associated with the formation of new myofibers during embryonic development, postlarval growth, and muscle regeneration. Using cell-mixing experiments, we observed that trout myomaker has retained the ability to drive the fusion of mouse fibroblasts with C2C12 myoblasts. Our work reveals that trout myomaker has fusogenic function despite containing two protein extensions.
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Affiliation(s)
- Aurélie Landemaine
- From the Institut National de la Recherche Agronomique, UR1037 Laboratory of Fish Physiology and Genomics, 35000 Rennes, France
| | - Andres Ramirez-Martinez
- the Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390, and
| | - Olivier Monestier
- Institute of Interdisciplinary Research in Human and Molecular Biology, Université Libre de Bruxelles, 1070 Bruxelles, Belgium
| | - Nathalie Sabin
- From the Institut National de la Recherche Agronomique, UR1037 Laboratory of Fish Physiology and Genomics, 35000 Rennes, France
| | - Pierre-Yves Rescan
- From the Institut National de la Recherche Agronomique, UR1037 Laboratory of Fish Physiology and Genomics, 35000 Rennes, France
| | - Eric N Olson
- the Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390, and
| | - Jean-Charles Gabillard
- From the Institut National de la Recherche Agronomique, UR1037 Laboratory of Fish Physiology and Genomics, 35000 Rennes, France,
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48
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Si Y, Wen H, Du S. Genetic Mutations in jamb, jamc, and myomaker Revealed Different Roles on Myoblast Fusion and Muscle Growth. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2019; 21:111-123. [PMID: 30467785 PMCID: PMC6467518 DOI: 10.1007/s10126-018-9865-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 11/15/2018] [Indexed: 05/08/2023]
Abstract
Myoblast fusion is a vital step for skeletal muscle development, growth, and regeneration. Loss of Jamb, Jamc, or Myomaker (Mymk) function impaired myoblast fusion in zebrafish embryos. In addition, mymk mutation hampered fish muscle growth. However, the effect of Jamb and Jamc deficiency on fish muscle growth is not clear. Moreover, whether jamb;jamc and jamb;mymk double mutations have stronger effects on myoblast fusion and muscle growth remains to be investigated. Here, we characterized the muscle development and growth in jamb, jamc, and mymk single and double mutants in zebrafish. We found that although myoblast fusion was compromised in jamb and jamc single or jamb;jamc double mutants, these mutant fish showed no defect in muscle cell fusion during muscle growth. The mutant fish were able to grow into adults that were indistinguishable from the wild-type sibling. In contrast, the jamb;mymk double mutants exhibited a stronger muscle phenotype compared to the jamb and jamc single and double mutants. The jamb;mymk double mutant showed reduced growth and partial lethality, similar to a mymk single mutant. Single fiber analysis of adult skeletal myofibers revealed that jamb, jamc, or jamb;jamc mutants contained mainly multinucleated myofibers, whereas jamb;mymk double mutants contained mostly mononucleated fibers. Significant intramuscular adipocyte infiltration was found in skeletal muscles of the jamb;mymk mutant. Collectively, these studies demonstrate that although Jamb, Jamc, and Mymk are all involved in myoblast fusion during early myogenesis, they have distinct roles in myoblast fusion during muscle growth. While Mymk is essential for myoblast fusion during both muscle development and growth, Jamb and Jamc are dispensable for myoblast fusion during muscle growth.
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MESH Headings
- Animals
- Animals, Genetically Modified
- Cell Communication
- Cell Differentiation
- Cell Fusion
- Embryo, Nonmammalian
- Gene Expression Regulation, Developmental
- Junctional Adhesion Molecule B/deficiency
- Junctional Adhesion Molecule B/genetics
- Membrane Proteins/deficiency
- Membrane Proteins/genetics
- Muscle Development/genetics
- Muscle Fibers, Skeletal/cytology
- Muscle Fibers, Skeletal/metabolism
- Muscle Proteins/deficiency
- Muscle Proteins/genetics
- Muscle, Skeletal/cytology
- Muscle, Skeletal/growth & development
- Muscle, Skeletal/metabolism
- Mutation
- Myoblasts/cytology
- Myoblasts/metabolism
- Receptors, Cell Surface/deficiency
- Receptors, Cell Surface/genetics
- Zebrafish/genetics
- Zebrafish/growth & development
- Zebrafish/metabolism
- Zebrafish Proteins/deficiency
- Zebrafish Proteins/genetics
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Affiliation(s)
- Yufeng Si
- Department of Biochemistry and Molecular Biology, Institute of Marine and Environmental Technology, University of Maryland School of Medicine, 701 East Pratt Street, Baltimore, MD, 21202, USA
- The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266003, China
| | - Haishen Wen
- The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266003, China
| | - Shaojun Du
- Department of Biochemistry and Molecular Biology, Institute of Marine and Environmental Technology, University of Maryland School of Medicine, 701 East Pratt Street, Baltimore, MD, 21202, USA.
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49
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Hall AE, Rose MD. Cell fusion in yeast is negatively regulated by components of the cell wall integrity pathway. Mol Biol Cell 2018; 30:441-452. [PMID: 30586320 PMCID: PMC6594448 DOI: 10.1091/mbc.e18-04-0236] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
During mating, Saccharomyces cerevisiae cells must degrade the intervening cell wall to allow fusion of the partners. Because improper timing or location of cell wall degradation would cause lysis, the initiation of cell fusion must be highly regulated. Here, we find that yeast cell fusion is negatively regulated by components of the cell wall integrity (CWI) pathway. Loss of the cell wall sensor, MID2, specifically causes “mating-induced death” after pheromone exposure. Mating-induced death is suppressed by mutations in cell fusion genes (FUS1, FUS2, RVS161, CDC42), implying that mid2Δ cells die from premature fusion without a partner. Consistent with premature fusion, mid2Δ shmoos had thinner cell walls and lysed at the shmoo tip. Normally, Cdc42p colocalizes with Fus2p to form a focus only when mating cells are in contact (prezygotes) and colocalization is required for cell fusion. However, Cdc42p was aberrantly colocalized with Fus2p to form a focus in mid2Δ shmoos. A hyperactive allele of the CWI kinase Pkc1p (PKC1*) caused decreased cell fusion and Cdc42p localization in prezygotes. In shmoos, PKC1* increased Cdc42p localization; however, it was not colocalized with Fus2p or associated with cell death. We conclude that Mid2p and Pkc1p negatively regulate cell fusion via Cdc42p and Fus2p.
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Affiliation(s)
- Allison E Hall
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544
| | - Mark D Rose
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544.,Department of Biology, Georgetown University, Washington, DC 20057
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50
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Bell C, Nevitt S, McKay VH, Fattah AY. Will the real Moebius syndrome please stand up? A systematic review of the literature and statistical cluster analysis of clinical features. Am J Med Genet A 2018; 179:257-265. [PMID: 30556292 DOI: 10.1002/ajmg.a.60683] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 09/19/2018] [Accepted: 10/10/2018] [Indexed: 01/04/2023]
Abstract
Moebius syndrome is a highly variable syndrome with abducens and facial nerve palsy as core features. Strict diagnostic criteria do not exist and the inconsistency of the associated features makes determination difficult. To determine what features are associated with Moebius syndrome we performed a systematic literature review resulting in a composite case series of 449 individuals labeled with Moebius syndrome. We applied minimum criteria (facial and abducens palsy) to determine the prevalence of associated clinical features in this series. Additionally, we performed statistical cluster analysis to determine which features tended to occur together. Our study comprises the largest series of patients with Moebius syndrome and the first to apply statistical methodology to elucidate clinical relationships. We present evidence for two groups within the Moebius diagnosis. Type 1: exhibiting micrognathia, limb anomalies and feeding/swallowing difficulty that tend to occur together. Type 2: phenotypically diverse but more associated with radiologically detectable neurologic abnormalities and developmental delay.
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Affiliation(s)
- Chris Bell
- School of Medicine, University of Liverpool, Liverpool, United Kingdom
| | - Sarah Nevitt
- Department of Biostatistics, University of Liverpool, Liverpool, United Kingdom
| | - Victoria H McKay
- Department of Clinical Genetics, Liverpool Women's Hospital, Liverpool, United Kingdom
| | - Adel Y Fattah
- Facial Nerve Programme, Regional Paediatric Burns and Plastic Surgery Service, Alder Hey Children's Foundation Trust, Liverpool, United Kingdom
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