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Iyer A, Lauerova B, Mariano J, Haberlová J, Lassuthova P, Zidkova J, Wright NT, Kontrogianni-Konstantopoulos A. Compound heterozygous variants in MYBPC1 lead to severe distal arthrogryposis type-1 manifestations. Gene 2024; 910:148339. [PMID: 38438057 PMCID: PMC10981553 DOI: 10.1016/j.gene.2024.148339] [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: 01/10/2024] [Revised: 02/17/2024] [Accepted: 03/01/2024] [Indexed: 03/06/2024]
Abstract
Dominant missense variants in MYBPC1 encoding slow Myosin Binding Protein-C (sMyBP-C) have been increasingly linked to arthrogryposis syndromes and congenital myopathy with tremor. Herein, we describe novel compound heterozygous variants - NM_002465.4:[c.2486_2492del];[c.2663A > G] - present in fibronectin-III (Fn-III) C7 and immunoglobulin (Ig) C8 domains, respectively, manifesting as severe, early-onset distal arthrogryposis type-1, with the carrier requiring intensive care and several surgical interventions at an early age. Computational modeling predicts that the c.2486_2492del p.(Lys829IlefsTer7) variant destabilizes the structure of the Fn-III C7 domain, while the c.2663A > G p.(Asp888Gly) variant causes minimal structural alterations in the Ig C8 domain. Although the parents of the proband are heterozygous carriers for a single variant, they exhibit no musculoskeletal defects, suggesting a complex interplay between the two mutant alleles underlying this disorder. As emerging novel variants in MYBPC1 are shown to be causatively associated with musculoskeletal disease, it becomes clear that MYBPC1 should be included in relevant genetic screenings.
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Affiliation(s)
- Aishwarya Iyer
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Barbora Lauerova
- Department of Paediatric Neurology, Second Faculty of Medicine Charles University and University Hospital Motol, Prague, Czech Republic; Full Member of the ERN Euro-NMD, Prague, Czech Republic
| | - Jennifer Mariano
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Jana Haberlová
- Department of Paediatric Neurology, Second Faculty of Medicine Charles University and University Hospital Motol, Prague, Czech Republic; Full Member of the ERN Euro-NMD, Prague, Czech Republic
| | - Petra Lassuthova
- Department of Paediatric Neurology, Second Faculty of Medicine Charles University and University Hospital Motol, Prague, Czech Republic; Full Member of the ERN Euro-NMD, Prague, Czech Republic
| | - Jana Zidkova
- Centre of Molecular Biology and Genetics, University Hospital Brno, Czech Republic
| | - Nathan T Wright
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, VA, USA
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2
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Lanvin PL, Li D, Conrad S, Magot A, Micaelli X, Péréon Y, Vincent M, Isidor B, Sternberg D, McCormick EM, Hakonarson H, Mercier S, Falk MJ. Expanding the Spectrum of Congenital Myopathy Linked to Variants in the MYBPC1 Gene: A Clinical Report. Neurol Clin Pract 2024; 14:e200228. [PMID: 38690148 PMCID: PMC11057435 DOI: 10.1212/cpj.0000000000200228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 11/07/2023] [Indexed: 05/02/2024]
Abstract
Objectives Heterozygous missense variants in MYBPC1 have been recently identified in 13 patients from 6 families with congenital myopathy with tremor. All the patients had mild skeletal myopathy invariably associated with a distinctive myogenic tremor and hypotonia with gradual clinical improvement. However, no phenotypic description has been reported for the neonatal respiratory impairment that patients may suffer. Methods We report 3 new patients from 2 independent families with congenital myopathy with tremor. Results Tremors and respiratory distress associated with stridor should raise the diagnosis of congenital myopathy with tremors linked to MYBPC1-dominant variants in children with neonatal hypotonia. Discussion Neonatal severe respiratory impairment requiring intensive noninvasive ventilation because of stridor is described in 2 patients. Stridor was previously reported in one other case and is part of the clinical features.
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Affiliation(s)
- Pierre-Louis Lanvin
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Dong Li
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Solène Conrad
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Armelle Magot
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Xavier Micaelli
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Yann Péréon
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Marie Vincent
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Bertrand Isidor
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Damien Sternberg
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Elizabeth M McCormick
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Hakon Hakonarson
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Sandra Mercier
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
| | - Marni J Falk
- CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La Roche sur Yon, France; Nantes Université (MV, BI, SM), CNRS, INSERM, l'institut du thorax; APHP (DS), Metabolic Biochemistry Department, Genetics Center, Pitié-Salpêtrière Hospital Group, Center of Research in Myology, APHP Sorbonne University, Paris, France; Mitochondrial Medicine Frontier Program (EMM, MJF), Division of Human Genetics, Department of Pediatrics; and Division of Pulmonary Medicine (HH), The Joseph Stokes, Jr. Research Institute, Children's Hospital of Philadelphia, PA
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Mead AF, Wood NB, Nelson SR, Palmer BM, Yang L, Previs SB, Ploysangngam A, Kennedy GG, McAdow JF, Tremble SM, Cipolla MJ, Ebert AM, Johnson AN, Gurnett CA, Previs MJ, Warshaw DM. Functional role of myosin-binding protein H in thick filaments of developing vertebrate fast-twitch skeletal muscle. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.10.593199. [PMID: 38798399 PMCID: PMC11118323 DOI: 10.1101/2024.05.10.593199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Myosin-binding protein H (MyBP-H) is a component of the vertebrate skeletal muscle sarcomere with sequence and domain homology to myosin-binding protein C (MyBP-C). Whereas skeletal muscle isoforms of MyBP-C (fMyBP-C, sMyBP-C) modulate muscle contractility via interactions with actin thin filaments and myosin motors within the muscle sarcomere "C-zone," MyBP-H has no known function. This is in part due to MyBP-H having limited expression in adult fast-twitch muscle and no known involvement in muscle disease. Quantitative proteomics reported here reveal MyBP-H is highly expressed in prenatal rat fast-twitch muscles and larval zebrafish, suggesting a conserved role in muscle development, and promoting studies to define its function. We take advantage of the genetic control of the zebrafish model and a combination of structural, functional, and biophysical techniques to interrogate the role of MyBP-H. Transgenic, FLAG-tagged MyBP-H or fMyBP-C both localize to the C-zones in larval myofibers, whereas genetic depletion of endogenous MyBP-H or fMyBP-C leads to increased accumulation of the other, suggesting competition for C-zone binding sites. Does MyBP-H modulate contractility from the C-zone? Globular domains critical to MyBP-C's modulatory functions are absent from MyBP-H, suggesting MyBP-H may be functionally silent. However, our results suggest an active role. Small angle x-ray diffraction of intact larval tails revealed MyBP-H contributes to the compression of the myofilament lattice accompanying stretch or contraction, while in vitro motility experiments indicate MyBP-H shares MyBP-C's capacity as a molecular "brake". These results provide new insights and raise questions about the role of the C-zone during muscle development.
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Affiliation(s)
- Andrew F. Mead
- Department of Molecular Physiology and Biophysics, Larner College of Medicine, University of Vermont, Burlington, VT 05405
- Cardiovascular Research Institute, University of Vermont, Burlington, VT 05405
| | - Neil B. Wood
- Department of Molecular Physiology and Biophysics, Larner College of Medicine, University of Vermont, Burlington, VT 05405
| | - Shane R. Nelson
- Department of Molecular Physiology and Biophysics, Larner College of Medicine, University of Vermont, Burlington, VT 05405
- Cardiovascular Research Institute, University of Vermont, Burlington, VT 05405
| | - Bradley M. Palmer
- Department of Molecular Physiology and Biophysics, Larner College of Medicine, University of Vermont, Burlington, VT 05405
- Cardiovascular Research Institute, University of Vermont, Burlington, VT 05405
| | - Lin Yang
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973
| | - Samantha Beck Previs
- Department of Molecular Physiology and Biophysics, Larner College of Medicine, University of Vermont, Burlington, VT 05405
- Cardiovascular Research Institute, University of Vermont, Burlington, VT 05405
| | - Angela Ploysangngam
- Department of Molecular Physiology and Biophysics, Larner College of Medicine, University of Vermont, Burlington, VT 05405
| | - Guy G. Kennedy
- Department of Molecular Physiology and Biophysics, Larner College of Medicine, University of Vermont, Burlington, VT 05405
| | - Jennifer F. McAdow
- Department of Neurlogical Sciences, Larner College of Medicine, University of Vermont, Burlington, VT 05405
| | - Sarah M. Tremble
- Department of Electrical and Biomedical Engineering, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, VT 05405
| | - Marilyn J. Cipolla
- Department of Electrical and Biomedical Engineering, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, VT 05405
- Department of Neurology, Washington University School of Medicine in St. Louis, St. Louis, MO 63110
| | - Alicia M. Ebert
- Department of Biology, College of Arts and Sciences, University of Vermont, Burlington, VT 05405
| | - Aaron N. Johnson
- Department of Developmental Biology, Washington University School of Medicine in St. Louis, St. Louis, MO 63110
| | - Christina A. Gurnett
- Department of Developmental Biology, Washington University School of Medicine in St. Louis, St. Louis, MO 63110
| | - Michael J. Previs
- Department of Molecular Physiology and Biophysics, Larner College of Medicine, University of Vermont, Burlington, VT 05405
- Cardiovascular Research Institute, University of Vermont, Burlington, VT 05405
| | - David M. Warshaw
- Department of Molecular Physiology and Biophysics, Larner College of Medicine, University of Vermont, Burlington, VT 05405
- Cardiovascular Research Institute, University of Vermont, Burlington, VT 05405
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Zhang F, Guo H, Zhou X, Deng Z, Xu Q, Wang Q, Yuan H, Luo J. Novel PIP5K1C variant identified in a Chinese pedigree with lethal congenital contractural syndrome 3. BMC Pediatr 2024; 24:182. [PMID: 38491417 PMCID: PMC10941444 DOI: 10.1186/s12887-024-04674-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 02/26/2024] [Indexed: 03/18/2024] Open
Abstract
BACKGROUND Biallelic pathogenic variants in PIP5K1C (MIM #606,102) lead to lethal congenital contractural syndrome 3 (LCCS3, MIM #611,369), a rare autosomal recessive genetic disorder characterized by small gestational age, severe multiple joint contractures and muscle atrophy, early death due to respiratory failure. Currently, 5 individuals with LCCS3 were reported and 5 pathogenic variants in PIP5K1C were identified. Here, we reported the two fetuses in a Chinese pedigree who displayed multiple joint contractures and other congenital anomalies. METHODS Trio-based whole-exome sequencing (WES) was performed for the parents and the recent fetus to detect the genetic cause for fetus phenotype. RESULTS A novel variant, NM_012398.3: c.949_952dup, p.S318Ifs*28 and a previously reported variant, c.688_689del, p.G230Qfs*114 (ClinVar database) in PIP5K1C, were detected in the individuals, and these variants were inherited from the mother and father, respectively. We described the features of multiple joint contractures in our fetuses, including bilateral talipes equinovarus, stiffness in the limbs, extended knees, persistently closed hands and overlapping fingers, which have not been delineated detailedly in previously reported LCCS3 individuals. Furthermore, novel phenotype, bilateral dilated lateral ventricles, was revealed in one fetus. CONCLUSIONS These findings expanded the genetic variant spectrum of PIP5K1C and enriched the clinical features of LCCS3, which will help with the prenatal diagnosis and genetic counseling for this family.
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Affiliation(s)
- Fang Zhang
- Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China
| | - Hongmei Guo
- Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China
| | - Xinlong Zhou
- Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China
- Key Laboratory for Precision Diagnosis and Treatment of Severe Infectious Diseases in Children, Dongguan, 523120, China
| | - Zhengxi Deng
- Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China
| | - Qiuhong Xu
- Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China
| | - Qingming Wang
- Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China
- Department of Medical Genetics, Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China
| | - Haiming Yuan
- Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China.
- Department of Medical Genetics, Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China.
| | - Jianhua Luo
- Dongguan Maternal and Child Health Care Hospital, Dongguan, 523120, China.
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Elkrief D, Matusovsky O, Cheng YS, Rassier DE. From amino-acid to disease: the effects of oxidation on actin-myosin interactions in muscle. J Muscle Res Cell Motil 2023; 44:225-254. [PMID: 37805961 DOI: 10.1007/s10974-023-09658-0] [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: 06/07/2023] [Accepted: 08/15/2023] [Indexed: 10/10/2023]
Abstract
Actin-myosin interactions form the basis of the force-producing contraction cycle within the sarcomere, serving as the primary mechanism for muscle contraction. Post-translational modifications, such as oxidation, have a considerable impact on the mechanics of these interactions. Considering their widespread occurrence, the explicit contributions of these modifications to muscle function remain an active field of research. In this review, we aim to provide a comprehensive overview of the basic mechanics of the actin-myosin complex and elucidate the extent to which oxidation influences the contractile cycle and various mechanical characteristics of this complex at the single-molecule, myofibrillar and whole-muscle levels. We place particular focus on amino acids shown to be vulnerable to oxidation in actin, myosin, and some of their binding partners. Additionally, we highlight the differences between in vitro environments, where oxidation is controlled and limited to actin and myosin and myofibrillar or whole muscle environments, to foster a better understanding of oxidative modification in muscle. Thus, this review seeks to encompass a broad range of studies, aiming to lay out the multi layered effects of oxidation in in vitro and in vivo environments, with brief mention of clinical muscular disorders associated with oxidative stress.
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Affiliation(s)
- Daren Elkrief
- Department of Physiology, McGill University, Montreal, QC, Canada
| | - Oleg Matusovsky
- Department of Kinesiology and Physical Education, McGill University, Montreal, QC, Canada
| | - Yu-Shu Cheng
- Department of Kinesiology and Physical Education, McGill University, Montreal, QC, Canada
| | - Dilson E Rassier
- Department of Physiology, McGill University, Montreal, QC, Canada.
- Department of Kinesiology and Physical Education, McGill University, Montreal, QC, Canada.
- Simon Fraser University, Burnaby, BC, Canada.
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Song T, McNamara JW, Baby A, Ma W, Landim-Vieira M, Natesan S, Pinto JR, Lorenz JN, Irving TC, Sadayappan S. Unlocking the Role of sMyBP-C: A Key Player in Skeletal Muscle Development and Growth. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.23.563591. [PMID: 38076858 PMCID: PMC10705270 DOI: 10.1101/2023.10.23.563591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Skeletal muscle is the largest organ in the body, responsible for gross movement and metabolic regulation. Recently, variants in the MYBPC1 gene have been implicated in a variety of developmental muscle diseases, such as distal arthrogryposis. How MYBPC1 variants cause disease is not well understood. Here, through a collection of novel gene-edited mouse models, we define a critical role for slow myosin binding protein-C (sMyBP-C), encoded by MYBPC1, across muscle development, growth, and maintenance during prenatal, perinatal, postnatal and adult stages. Specifically, Mybpc1 knockout mice exhibited early postnatal lethality and impaired skeletal muscle formation and structure, skeletal deformity, and respiratory failure. Moreover, a conditional knockout of Mybpc1 in perinatal, postnatal and adult stages demonstrates impaired postnatal muscle growth and function secondary to disrupted actomyosin interaction and sarcomere structural integrity. These findings confirm the essential role of sMyBP-C in skeletal muscle and reveal specific functions in both prenatal embryonic musculoskeletal development and postnatal muscle growth and function.
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Affiliation(s)
- Taejeong Song
- Center for Cardiovascular Research, Division of Cardiovascular Health and Disease, Department of Internal Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - James W. McNamara
- Center for Cardiovascular Research, Division of Cardiovascular Health and Disease, Department of Internal Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - Akhil Baby
- Center for Cardiovascular Research, Division of Cardiovascular Health and Disease, Department of Internal Medicine, University of Cincinnati, Cincinnati, OH, USA
- Department of Genetic Engineering, School of Biotechnology, Madurai Kamaraj University, Madurai, India
| | - Weikang Ma
- BioCAT, Department of Biology, Illinois Institute of Technology, Chicago, IL, USA
| | - Maicon Landim-Vieira
- Department of Biomedical Sciences, Florida State University, Tallahassee, FL, USA
| | - Sankar Natesan
- Department of Genetic Engineering, School of Biotechnology, Madurai Kamaraj University, Madurai, India
| | - Jose Renato Pinto
- Department of Biomedical Sciences, Florida State University, Tallahassee, FL, USA
| | - John N. Lorenz
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Thomas C. Irving
- BioCAT, Department of Biology, Illinois Institute of Technology, Chicago, IL, USA
| | - Sakthivel Sadayappan
- Center for Cardiovascular Research, Division of Cardiovascular Health and Disease, Department of Internal Medicine, University of Cincinnati, Cincinnati, OH, USA
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7
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Bhandari V, Kim R, Faghfoury H, Silver J, Chan RH, Ding Q, Schwartz MLB, Bril V. Congenital Myopathy Due to Pathogenic Missense Variant in the MYBPC1 Gene. Can J Neurol Sci 2023:1-3. [PMID: 37577974 DOI: 10.1017/cjn.2023.257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Affiliation(s)
- Vinaya Bhandari
- Ellen & Martin Prosserman Centre for Neuromuscular Diseases, Toronto General Hospital, University Health Network, University of Toronto, Toronto, ON, Canada
| | - Raymond Kim
- Division of Clinical and Metabolic Genetics, University Health Network, University of Toronto, Toronto, ON, Canada
| | - Hanna Faghfoury
- Division of Clinical and Metabolic Genetics, Mount Sinai Hospital and University Health Network, University of Toronto, Toronto, ON, Canada
| | - Josh Silver
- Department of Molecular Genetics, University of Toronto & Fred A. Litwin Family Centre in Genetic Medicine, University Health Network and Mount Sinai Hospital, Toronto, ON, Canada
| | - Raymond H Chan
- University health Network, University of Toronto, Toronto, ON, Canada
| | - Qiliang Ding
- Ted Rogers Centre for Heart Research, Cardiac Genome Clinic, The Hospital for Sick Children, Toronto, ON, Canada
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, Toronto, ON, Canada
- The Centre for Applied Genomics, The Hospital for Sick Children, Toronto, ON, Canada
| | - Marci L B Schwartz
- Ted Rogers Centre for Heart Research, Cardiac Genome Clinic, The Hospital for Sick Children, Toronto, ON, Canada
| | - Vera Bril
- Ellen & Martin Prosserman Centre for Neuromuscular Diseases, Toronto General Hospital, University Health Network, University of Toronto, Toronto, ON, Canada
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, Toronto, ON, Canada
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8
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Desai DA, Rao VJ, Jegga AG, Dhandapany PS, Sadayappan S. Heterogeneous Distribution of Genetic Mutations in Myosin Binding Protein-C Paralogs. Front Genet 2022; 13:896117. [PMID: 35832193 PMCID: PMC9272480 DOI: 10.3389/fgene.2022.896117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 06/07/2022] [Indexed: 11/29/2022] Open
Abstract
Myosin binding protein-C (MyBP-C) is a sarcomeric protein which regulates the force of contraction in striated muscles. Mutations in the MYBPC family of genes, including slow skeletal (MYBPC1), fast skeletal (MYBPC2) and cardiac (MYBPC3), can result in cardiac and skeletal myopathies. Nonetheless, their evolutionary pattern, pathogenicity and impact on MyBP-C protein structure remain to be elucidated. Therefore, the present study aimed to systematically assess the evolutionarily conserved and epigenetic patterns of MYBPC family mutations. Leveraging a machine learning (ML) approach, the Genome Aggregation Database (gnomAD) provided variants in MYBPC1, MYBPC2, and MYBPC3 genes. This was followed by an analysis with Ensembl’s variant effect predictor (VEP), resulting in the identification of 8,618, 3,871, and 3,071 variants in MYBPC1, MYBPC2, and MYBPC3, respectively. Missense variants comprised 61%–66% of total variants in which the third nucleotide positions in the codons were highly altered. Arginine was the most mutated amino acid, important because most disease-causing mutations in MyBP-C proteins are arginine in origin. Domains C5 and C6 of MyBP-C were found to be hotspots for most mutations in the MyBP-C family of proteins. A high percentage of truncated mutations in cMyBP-C cause cardiomyopathies. Arginine and glutamate were the top hits in fMyBP-C and cMyBP-C, respectively, and tryptophan and tyrosine were the most common among the three paralogs changing to premature stop codons and causing protein truncations at the carboxyl terminus. A heterogeneous epigenetic pattern was identified among the three MYBP-C paralogs. Overall, it was shown that databases using computational approaches can facilitate diagnosis and drug discovery to treat muscle disorders caused by MYBPC mutations.
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Affiliation(s)
- Darshini A. Desai
- Department of Internal Medicine, Division of Cardiovascular Health and Disease, University of Cincinnati, Cincinnati, OH, United States
| | - Vinay J. Rao
- Cardiovascular Biology and Disease Theme, Institute for Stem Cell Science and Regenerative Medicine, Bangalore, India
| | - Anil G. Jegga
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, United States
- Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, United States
| | - Perundurai S. Dhandapany
- Cardiovascular Biology and Disease Theme, Institute for Stem Cell Science and Regenerative Medicine, Bangalore, India
- The Knight Cardiovascular Institute, Oregon Health and Science University, Portland, OR, United States
| | - Sakthivel Sadayappan
- Department of Internal Medicine, Division of Cardiovascular Health and Disease, University of Cincinnati, Cincinnati, OH, United States
- *Correspondence: Sakthivel Sadayappan,
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9
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Xu J, Zhang S, Si H, Zeng Y, Wu Y, Liu Y, Li M, Wu L, Shen B. A genetic correlation scan identifies blood proteins associated with bone mineral density. BMC Musculoskelet Disord 2022; 23:530. [PMID: 35659283 PMCID: PMC9164489 DOI: 10.1186/s12891-022-05453-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 05/17/2022] [Indexed: 11/10/2022] Open
Abstract
Background Osteoporosis is a common metabolic bone disease that is characterized by low bone mass. However, limited efforts have been made to explore the functional relevance of the blood proteome to bone mineral density across different life stages. Methods Using genome-wide association study summary data of the blood proteome and two independent studies of bone mineral density, we conducted a genetic correlation scan of bone mineral density and the blood proteome. Linkage disequilibrium score regression analysis was conducted to assess genetic correlations between each of the 3283 plasma proteins and bone mineral density. Results Linkage disequilibrium score regression identified 18 plasma proteins showing genetic correlation signals with bone mineral density in the TB-BMD cohort, such as MYOM2 (coefficient = 0.3755, P value = 0.0328) among subjects aged 0 ~ 15, POSTN (coefficient = − 0.5694, P value = 0.0192) among subjects aged 30 ~ 45 and PARK7 (coefficient = − 0.3613, P value = 0.0052) among subjects aged over 60. Conclusions Our results identified multiple plasma proteins associated with bone mineral density and provided novel clues for revealing the functional relevance of plasma proteins to bone mineral density. Supplementary Information The online version contains supplementary material available at 10.1186/s12891-022-05453-z.
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Geist Hauserman J, Stavusis J, Joca HC, Robinett JC, Hanft L, Vandermeulen J, Zhao R, Stains JP, Konstantopoulos K, McDonald KS, Ward C, Kontrogianni-Konstantopoulos A. Sarcomeric deficits underlie MYBPC1-associated myopathy with myogenic tremor. JCI Insight 2021; 6:e147612. [PMID: 34437302 PMCID: PMC8525646 DOI: 10.1172/jci.insight.147612] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 08/25/2021] [Indexed: 12/02/2022] Open
Abstract
Myosin binding protein-C slow (sMyBP-C) comprises a subfamily of cytoskeletal proteins encoded by MYBPC1 that is expressed in skeletal muscles where it contributes to myosin thick filament stabilization and actomyosin cross-bridge regulation. Recently, our group described the causal association of dominant missense pathogenic variants in MYBPC1 with an early-onset myopathy characterized by generalized muscle weakness, hypotonia, dysmorphia, skeletal deformities, and myogenic tremor, occurring in the absence of neuropathy. To mechanistically interrogate the etiologies of this MYBPC1-associated myopathy in vivo, we generated a knock-in mouse model carrying the E248K pathogenic variant. Using a battery of phenotypic, behavioral, and physiological measurements spanning neonatal to young adult life, we found that heterozygous E248K mice faithfully recapitulated the onset and progression of generalized myopathy, tremor occurrence, and skeletal deformities seen in human carriers. Moreover, using a combination of biochemical, ultrastructural, and contractile assessments at the level of the tissue, cell, and myofilaments, we show that the loss-of-function phenotype observed in mutant muscles is primarily driven by disordered and misaligned sarcomeres containing fragmented and out-of-register internal membranes that result in reduced force production and tremor initiation. Collectively, our findings provide mechanistic insights underscoring the E248K-disease pathogenesis and offer a relevant preclinical model for therapeutic discovery.
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Affiliation(s)
- Janelle Geist Hauserman
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Janis Stavusis
- Latvian Biomedical Research and Study Centre, Riga, Latvia
| | - Humberto C. Joca
- Department of Orthopedics, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Joel C. Robinett
- Department of Medical Pharmacology and Physiology, University of Missouri, School of Medicine Columbia, Missouri, USA
| | - Laurin Hanft
- Department of Medical Pharmacology and Physiology, University of Missouri, School of Medicine Columbia, Missouri, USA
| | - Jack Vandermeulen
- Department of Orthopedics, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Runchen Zhao
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA
| | - Joseph P. Stains
- Department of Orthopedics, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | | | - Kerry S. McDonald
- Department of Medical Pharmacology and Physiology, University of Missouri, School of Medicine Columbia, Missouri, USA
| | - Christopher Ward
- Department of Orthopedics, University of Maryland School of Medicine, Baltimore, Maryland, USA
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11
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Whittle J, Johnson A, Dobbs MB, Gurnett CA. Models of Distal Arthrogryposis and Lethal Congenital Contracture Syndrome. Genes (Basel) 2021; 12:genes12060943. [PMID: 34203046 PMCID: PMC8234565 DOI: 10.3390/genes12060943] [Citation(s) in RCA: 3] [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: 05/17/2021] [Revised: 06/10/2021] [Accepted: 06/16/2021] [Indexed: 12/28/2022] Open
Abstract
Distal arthrogryposis and lethal congenital contracture syndromes describe a broad group of disorders that share congenital limb contractures in common. While skeletal muscle sarcomeric genes comprise many of the first genes identified for Distal Arthrogyposis, other mechanisms of disease have been demonstrated, including key effects on peripheral nerve function. While Distal Arthrogryposis and Lethal Congenital Contracture Syndromes display superficial similarities in phenotype, the underlying mechanisms for these conditions are diverse but overlapping. In this review, we discuss the important insights gained into these human genetic diseases resulting from in vitro molecular studies and in vivo models in fruit fly, zebrafish, and mice.
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Affiliation(s)
- Julia Whittle
- Department of Neurology, Washington University in St Louis, St Louis, MO 63130, USA;
| | - Aaron Johnson
- Department of Developmental Biology, Washington University in St Louis, St Louis, MO 63130, USA;
| | - Matthew B. Dobbs
- Paley Orthopaedic and Spine Institute, West Palm Beach, FL 33407, USA;
| | - Christina A. Gurnett
- Department of Neurology, Washington University in St Louis, St Louis, MO 63130, USA;
- Correspondence:
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12
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Song T, McNamara JW, Ma W, Landim-Vieira M, Lee KH, Martin LA, Heiny JA, Lorenz JN, Craig R, Pinto JR, Irving T, Sadayappan S. Fast skeletal myosin-binding protein-C regulates fast skeletal muscle contraction. Proc Natl Acad Sci U S A 2021; 118:e2003596118. [PMID: 33888578 PMCID: PMC8092462 DOI: 10.1073/pnas.2003596118] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Fast skeletal myosin-binding protein-C (fMyBP-C) is one of three MyBP-C paralogs and is predominantly expressed in fast skeletal muscle. Mutations in the gene that encodes fMyBP-C, MYBPC2, are associated with distal arthrogryposis, while loss of fMyBP-C protein is associated with diseased muscle. However, the functional and structural roles of fMyBP-C in skeletal muscle remain unclear. To address this gap, we generated a homozygous fMyBP-C knockout mouse (C2-/-) and characterized it both in vivo and in vitro compared to wild-type mice. Ablation of fMyBP-C was benign in terms of muscle weight, fiber type, cross-sectional area, and sarcomere ultrastructure. However, grip strength and plantar flexor muscle strength were significantly decreased in C2-/- mice. Peak isometric tetanic force and isotonic speed of contraction were significantly reduced in isolated extensor digitorum longus (EDL) from C2-/- mice. Small-angle X-ray diffraction of C2-/- EDL muscle showed significantly increased equatorial intensity ratio during contraction, indicating a greater shift of myosin heads toward actin, while MLL4 layer line intensity was decreased at rest, indicating less ordered myosin heads. Interfilament lattice spacing increased significantly in C2-/- EDL muscle. Consistent with these findings, we observed a significant reduction of steady-state isometric force during Ca2+-activation, decreased myofilament calcium sensitivity, and sinusoidal stiffness in skinned EDL muscle fibers from C2-/- mice. Finally, C2-/- muscles displayed disruption of inflammatory and regenerative pathways, along with increased muscle damage upon mechanical overload. Together, our data suggest that fMyBP-C is essential for maximal speed and force of contraction, sarcomere integrity, and calcium sensitivity in fast-twitch muscle.
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Affiliation(s)
- Taejeong Song
- Division of Cardiovascular Health and Disease, Department of Internal Medicine, University of Cincinnati, OH 45267
| | - James W McNamara
- Division of Cardiovascular Health and Disease, Department of Internal Medicine, University of Cincinnati, OH 45267
| | - Weikang Ma
- Biophysics Collaborative Access Team, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL 60616
| | - Maicon Landim-Vieira
- Department of Biomedical Sciences, Florida State University College of Medicine, Tallahassee, FL 32306
| | - Kyoung Hwan Lee
- Division of Cell Biology and Imaging, Department of Radiology, University of Massachusetts Medical School, Worcester, MA 01655
| | - Lisa A Martin
- Division of Cardiovascular Health and Disease, Department of Internal Medicine, University of Cincinnati, OH 45267
| | - Judith A Heiny
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267
| | - John N Lorenz
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267
| | - Roger Craig
- Division of Cell Biology and Imaging, Department of Radiology, University of Massachusetts Medical School, Worcester, MA 01655
| | - Jose Renato Pinto
- Department of Biomedical Sciences, Florida State University College of Medicine, Tallahassee, FL 32306
| | - Thomas Irving
- Biophysics Collaborative Access Team, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL 60616
| | - Sakthivel Sadayappan
- Division of Cardiovascular Health and Disease, Department of Internal Medicine, University of Cincinnati, OH 45267;
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13
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Desai D, Stiene D, Song T, Sadayappan S. Distal Arthrogryposis and Lethal Congenital Contracture Syndrome - An Overview. Front Physiol 2020; 11:689. [PMID: 32670090 PMCID: PMC7330016 DOI: 10.3389/fphys.2020.00689] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 05/27/2020] [Indexed: 12/20/2022] Open
Abstract
Distal arthrogryposis (DA) is a skeletal muscle disorder which can be classified under a broader term as Arthrogryposis multiplex contractures. DA is characterized by the presence of joint contractures at various parts of the body, particularly in distal extremities. It is identified as an autosomal dominant and a rare X-linked recessive disorder associated with increased connective tissue formation around joints in such way that immobilizes muscle movement causing deformities. DA is again classified into various types since it manifests as a range of conditions representing different etiologies. Myopathy is one of the most commonly listed etiologies of DA. The mutations in sarcomeric protein-encoding genes lead to decreased sarcomere integrity, which is often associated with this disorder. Also, skeletal disorders are often associated with cardiac disorders. Some studies mention the presence of cardiomyopathy in patients with skeletal dysfunction. Therefore, it is hypothesized that the congenitally mutated protein that causes DA can also lead to cardiomyopathy. In this review, we will summarize the different forms of DA and their clinical features, along with gene mutations responsible for causing DA in its different forms. We will also examine reports that list mutations also known to cause heart disorders in the presence of DA.
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Affiliation(s)
- Darshini Desai
- Division of Cardiovascular Health and Disease, Department of Internal Medicine, Heart, Lung and Vascular Institute, College of Medicine, University of Cincinnati, Cincinnati, OH, United States
| | - Danielle Stiene
- Division of Cardiovascular Health and Disease, Department of Internal Medicine, Heart, Lung and Vascular Institute, College of Medicine, University of Cincinnati, Cincinnati, OH, United States
| | - Taejeong Song
- Division of Cardiovascular Health and Disease, Department of Internal Medicine, Heart, Lung and Vascular Institute, College of Medicine, University of Cincinnati, Cincinnati, OH, United States
| | - Sakthivel Sadayappan
- Division of Cardiovascular Health and Disease, Department of Internal Medicine, Heart, Lung and Vascular Institute, College of Medicine, University of Cincinnati, Cincinnati, OH, United States
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14
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CNTNAP1 Mutations and Their Clinical Presentations: New Case Report and Systematic Review. Case Rep Med 2020; 2020:8795607. [PMID: 32328110 PMCID: PMC7174947 DOI: 10.1155/2020/8795607] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 03/23/2020] [Accepted: 03/27/2020] [Indexed: 01/11/2023] Open
Abstract
Lethal congenital contracture syndrome type 7 (LCCS7) and congenital hypomyelinating neuropathy type 3 (CHN3) are rare autosomal recessive diseases, characterized by severe neonatal hypotonia, polyhydramnios, arthrogryposis, facial diplegia, and severe motor paralysis, leading to death in early infancy. They are related to mutations in the CNTNAP1 (contactin associated protein 1) gene, playing an important role in myelination. Recent studies have shown that both diseases could present with a wide phenotypic spectrum, with promising survival up to early childhood. We report on a 7-year-old boy from a nonconsanguineous Lebanese family presenting with neonatal hypotonia, respiratory distress, and arthrogryposis. Molecular analysis revealed the presence of a pathogenic variant in the CNTNAP1 gene leading to a premature stop codon: NM_003632.2:c.3361C>T p.(Arg1121∗). A review of the literature is discussed.
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15
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Shashi V, Geist J, Lee Y, Yoo Y, Shin U, Schoch K, Sullivan J, Stong N, Smith E, Jasien J, Kranz P, Lee Y, Shin YB, Wright NT, Choi M, Kontrogianni-Konstantopoulos A. Heterozygous variants in MYBPC1 are associated with an expanded neuromuscular phenotype beyond arthrogryposis. Hum Mutat 2019; 40:1115-1126. [PMID: 31264822 PMCID: PMC6688907 DOI: 10.1002/humu.23760] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 03/27/2019] [Accepted: 04/02/2019] [Indexed: 01/22/2023]
Abstract
Encoding the slow skeletal muscle isoform of myosin binding protein-C, MYBPC1 is associated with autosomal dominant and recessive forms of arthrogryposis. The authors describe a novel association for MYBPC1 in four patients from three independent families with skeletal muscle weakness, myogenic tremors, and hypotonia with gradual clinical improvement. The patients carried one of two de novo heterozygous variants in MYBPC1, with the p.Leu263Arg variant seen in three individuals and the p.Leu259Pro variant in one individual. Both variants are absent from controls, well conserved across vertebrate species, predicted to be damaging, and located in the M-motif. Protein modeling studies suggested that the p.Leu263Arg variant affects the stability of the M-motif, whereas the p.Leu259Pro variant alters its structure. In vitro biochemical and kinetic studies demonstrated that the p.Leu263Arg variant results in decreased binding of the M-motif to myosin, which likely impairs the formation of actomyosin cross-bridges during muscle contraction. Collectively, our data substantiate that damaging variants in MYBPC1 are associated with a new form of an early-onset myopathy with tremor, which is a defining and consistent characteristic in all affected individuals, with no contractures. Recognition of this expanded myopathic phenotype can enable identification of individuals with MYBPC1 variants without arthrogryposis.
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Affiliation(s)
- Vandana Shashi
- Division of Medical Genetics, Department of Pediatrics, Duke Health, Durham, North Carolina
| | - Janelle Geist
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland
| | - Youngha Lee
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yongjin Yoo
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Unbeom Shin
- School of Life Sciences, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
| | - Kelly Schoch
- Division of Medical Genetics, Department of Pediatrics, Duke Health, Durham, North Carolina
| | - Jennifer Sullivan
- Division of Medical Genetics, Department of Pediatrics, Duke Health, Durham, North Carolina
| | - Nicholas Stong
- Institute for Genomic Medicine, Columbia University, New York, New York
| | - Edward Smith
- Division of Pediatric Neurology, Department of Pediatrics, Duke Health, Durham, North Carolina
| | - Joan Jasien
- Division of Pediatric Neurology, Department of Pediatrics, Duke Health, Durham, North Carolina
| | - Peter Kranz
- Division of Neuroradiology, Department of Radiology, Duke Health, Durham, North Carolina
| | - Yoonsung Lee
- Center for Genomic Integrity, Institute for Basic Science, Ulsan, Republic of Korea
| | - Yong Beom Shin
- Department of Rehabilitation Medicine, Pusan National University College of Medicine, Pusan, Republic of Korea
| | - Nathan T Wright
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia
| | - Murim Choi
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea
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16
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McNamara JW, Sadayappan S. Skeletal myosin binding protein-C: An increasingly important regulator of striated muscle physiology. Arch Biochem Biophys 2018; 660:121-128. [PMID: 30339776 DOI: 10.1016/j.abb.2018.10.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/07/2018] [Accepted: 10/11/2018] [Indexed: 12/22/2022]
Abstract
The Myosin Binding Protein-C (MyBP-C) family is a group of sarcomeric proteins important for striated muscle structure and function. Comprising approximately 2% of the myofilament mass, MyBP-C has important roles in both contraction and relaxation. Three paralogs of MyBP-C are encoded by separate genes with distinct expression profiles in striated muscle. In mammals, cardiac MyBP-C is limited to the heart, and it is the most extensively studied owing to its involvement in cardiomyopathies. However, the roles of two skeletal paralogs, slow and fast, in muscle biology remain poorly characterized. Nonetheless, both have been recently implicated in the development of skeletal myopathies. This calls for a better understanding of their function in the pathophysiology of distal arthrogryposis. This review characterizes MyBP-C as a whole and points out knowledge gaps that still remain with respect to skeletal MyBP-C.
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Affiliation(s)
- James W McNamara
- Heart, Lung and Vascular Institute, Department of Internal Medicine, Division of Cardiovascular Health and Disease, University of Cincinnati, Cincinnati, OH 45236, USA
| | - Sakthivel Sadayappan
- Heart, Lung and Vascular Institute, Department of Internal Medicine, Division of Cardiovascular Health and Disease, University of Cincinnati, Cincinnati, OH 45236, USA.
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17
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Beecroft SJ, Lombard M, Mowat D, McLean C, Cairns A, Davis M, Laing NG, Ravenscroft G. Genetics of neuromuscular fetal akinesia in the genomics era. J Med Genet 2018; 55:505-514. [PMID: 29959180 DOI: 10.1136/jmedgenet-2018-105266] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 03/22/2018] [Accepted: 04/19/2018] [Indexed: 12/27/2022]
Abstract
Fetal hypokinesia or akinesia encompasses a broad spectrum of disorders, united by impaired movement in utero. Often, the underlying aetiology is genetic in origin, affecting part of the neuromuscular system. The affordable and high-throughput nature of next-generation DNA sequencing has led to an explosion in disease gene discovery across rare diseases, including fetal akinesias. A genetic diagnosis has clinical utility as it may affect management and prognosis and informs recurrence risk, facilitating family planning decisions. More broadly, knowledge of disease genes increasingly allows population-based preconception carrier screening, which has reduced the incidence of recessive diseases in several populations. Despite gains in knowledge of the genetics of fetal akinesia, many families lack a genetic diagnosis. In this review, we describe the developments in Mendelian genetics of neuromuscular fetal akinesia in the genomics era. We examine genetic diagnoses with neuromuscular causes, specifically including the lower motor neuron, peripheral nerve, neuromuscular junction and muscle.
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Affiliation(s)
- Sarah Jane Beecroft
- Centre for Medical Research, Faculty of Health and Medical Sciences, The University of Western Australia, Perth, Western Australia, Australia.,Harry Perkins Institute of Medical Research, QQ Block, QEII Medical Centre, Nedlands, Western Australia, Australia
| | - Marcus Lombard
- Centre for Medical Research, Faculty of Health and Medical Sciences, The University of Western Australia, Perth, Western Australia, Australia.,Harry Perkins Institute of Medical Research, QQ Block, QEII Medical Centre, Nedlands, Western Australia, Australia
| | - David Mowat
- Centre for Clinical Genetics, Sydney Children's Hospital, Sydney, New South Wales, Australia
| | - Catriona McLean
- Victorian Neuromuscular Laboratory, Alfred Health, Melbourne, Victoria, Australia
| | - Anita Cairns
- Department of Neurology, Lady Cilento Children's Hospital, Brisbane, Queensland, Australia
| | - Mark Davis
- Neurogenetics Laboratory, Department of Diagnostic Genomics, PP Block, QEII Medical Centre, Nedlands, Western Australia, Australia
| | - Nigel G Laing
- Centre for Medical Research, Faculty of Health and Medical Sciences, The University of Western Australia, Perth, Western Australia, Australia.,Harry Perkins Institute of Medical Research, QQ Block, QEII Medical Centre, Nedlands, Western Australia, Australia
| | - Gianina Ravenscroft
- Centre for Medical Research, Faculty of Health and Medical Sciences, The University of Western Australia, Perth, Western Australia, Australia.,Harry Perkins Institute of Medical Research, QQ Block, QEII Medical Centre, Nedlands, Western Australia, Australia
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18
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Geist J, Ward CW, Kontrogianni-Konstantopoulos A. Structure before function: myosin binding protein-C slow is a structural protein with regulatory properties. FASEB J 2018; 32:fj201800624R. [PMID: 29874125 PMCID: PMC6219831 DOI: 10.1096/fj.201800624r] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 05/14/2018] [Indexed: 01/12/2023]
Abstract
Myosin binding protein-C slow (sMyBP-C) comprises a family of accessory proteins in skeletal muscles that bind both myosin and actin filaments. Herein, we examined the role of sMyBP-C in adult skeletal muscles using in vivo gene transfer and clustered regularly interspaced short palindromic repeats technology to knock down all known sMyBP-C variants. Our findings, confirmed in two different skeletal muscles, demonstrated efficient knockdown (KD) of sMyBP-C (>70%) resulting in notably decreased levels of thick, but not thin, filament proteins ranging from ∼50% for slow and fast myosin to ∼20% for myomesin. Consistent with this, A bands were selectively distorted, and sarcomere length was significantly reduced. Contrary to earlier in vitro studies showing that addition of recombinant sMyBP-C slows down the formation of actomyosin crossbridges, our work demonstrates that KD of sMyBP-C in intact myofibers results in decreased contraction and relaxation kinetics under no-load conditions. Similarly, KD muscles develop markedly reduced twitch and tetanic force and contraction velocity. Taken together, our results show that sMyBP-C is essential for the regular organization and maintenance of myosin filaments into A bands and that its structural role precedes its ability to regulate actomyosin crossbridges.-Geist, J., Ward, C. W., Kontrogianni-Konstantopoulos, A. Structure before function: myosin binding protein-C slow is a structural protein with regulatory properties.
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Affiliation(s)
- Janelle Geist
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Christopher W. Ward
- Department of Orthopedics, University of Maryland School of Medicine, Baltimore, Maryland, USA
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19
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Wang L, Geist J, Grogan A, Hu LYR, Kontrogianni-Konstantopoulos A. Thick Filament Protein Network, Functions, and Disease Association. Compr Physiol 2018; 8:631-709. [PMID: 29687901 PMCID: PMC6404781 DOI: 10.1002/cphy.c170023] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Sarcomeres consist of highly ordered arrays of thick myosin and thin actin filaments along with accessory proteins. Thick filaments occupy the center of sarcomeres where they partially overlap with thin filaments. The sliding of thick filaments past thin filaments is a highly regulated process that occurs in an ATP-dependent manner driving muscle contraction. In addition to myosin that makes up the backbone of the thick filament, four other proteins which are intimately bound to the thick filament, myosin binding protein-C, titin, myomesin, and obscurin play important structural and regulatory roles. Consistent with this, mutations in the respective genes have been associated with idiopathic and congenital forms of skeletal and cardiac myopathies. In this review, we aim to summarize our current knowledge on the molecular structure, subcellular localization, interacting partners, function, modulation via posttranslational modifications, and disease involvement of these five major proteins that comprise the thick filament of striated muscle cells. © 2018 American Physiological Society. Compr Physiol 8:631-709, 2018.
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Affiliation(s)
- Li Wang
- Department of Biochemistry and Molecular Biology, University of Maryland, Baltimore, Maryland, USA
| | - Janelle Geist
- Department of Biochemistry and Molecular Biology, University of Maryland, Baltimore, Maryland, USA
| | - Alyssa Grogan
- Department of Biochemistry and Molecular Biology, University of Maryland, Baltimore, Maryland, USA
| | - Li-Yen R. Hu
- Department of Biochemistry and Molecular Biology, University of Maryland, Baltimore, Maryland, USA
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20
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Lin BL, Li A, Mun JY, Previs MJ, Previs SB, Campbell SG, Dos Remedios CG, Tombe PDP, Craig R, Warshaw DM, Sadayappan S. Skeletal myosin binding protein-C isoforms regulate thin filament activity in a Ca 2+-dependent manner. Sci Rep 2018; 8:2604. [PMID: 29422607 PMCID: PMC5805719 DOI: 10.1038/s41598-018-21053-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 01/29/2018] [Indexed: 01/17/2023] Open
Abstract
Muscle contraction, which is initiated by Ca2+, results in precise sliding of myosin-based thick and actin-based thin filament contractile proteins. The interactions between myosin and actin are finely tuned by three isoforms of myosin binding protein-C (MyBP-C): slow-skeletal, fast-skeletal, and cardiac (ssMyBP-C, fsMyBP-C and cMyBP-C, respectively), each with distinct N-terminal regulatory regions. The skeletal MyBP-C isoforms are conditionally coexpressed in cardiac muscle, but little is known about their function. Therefore, to characterize the functional differences and regulatory mechanisms among these three isoforms, we expressed recombinant N-terminal fragments and examined their effect on contractile properties in biophysical assays. Addition of the fragments to in vitro motility assays demonstrated that ssMyBP-C and cMyBP-C activate thin filament sliding at low Ca2+. Corresponding 3D electron microscopy reconstructions of native thin filaments suggest that graded shifts of tropomyosin on actin are responsible for this activation (cardiac > slow-skeletal > fast-skeletal). Conversely, at higher Ca2+, addition of fsMyBP-C and cMyBP-C fragments reduced sliding velocities in the in vitro motility assays and increased force production in cardiac muscle fibers. We conclude that due to the high frequency of Ca2+ cycling in cardiac muscle, cardiac MyBP-C may play dual roles at both low and high Ca2+. However, skeletal MyBP-C isoforms may be tuned to meet the needs of specific skeletal muscles.
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Affiliation(s)
- Brian Leei Lin
- Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, IL, 60153, USA
| | - Amy Li
- Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, VT, 05405, USA
- Bosch Institute, Discipline of Anatomy and Histology, University of Sydney, Sydney, 2006, Australia
| | - Ji Young Mun
- Department of Cell and Developmental Biology, University of Massachusetts Medical School, Worcester, MA, 01655, USA
- Department of Structure and Function of Neural Network, Korea Brain Research Institute, Dong-gu, Daegu, Korea
| | - Michael J Previs
- Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, VT, 05405, USA
| | - Samantha Beck Previs
- Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, VT, 05405, USA
| | - Stuart G Campbell
- Departments of Biomedical Engineering and Cellular and Molecular Physiology, Yale University, New Haven, CT, 06520, USA
| | - Cristobal G Dos Remedios
- Bosch Institute, Discipline of Anatomy and Histology, University of Sydney, Sydney, 2006, Australia
| | - Pieter de P Tombe
- Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, IL, 60153, USA
| | - Roger Craig
- Department of Cell and Developmental Biology, University of Massachusetts Medical School, Worcester, MA, 01655, USA
| | - David M Warshaw
- Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, VT, 05405, USA
| | - Sakthivel Sadayappan
- Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, IL, 60153, USA.
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21
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Safdarian M, Safdarian M. An arthrogrypotic medical doctor with cervical kyphosis and thoracic lordoscoliosis. Bone Rep 2017; 6:1-2. [PMID: 28377974 PMCID: PMC5365271 DOI: 10.1016/j.bonr.2016.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 10/26/2016] [Accepted: 11/13/2016] [Indexed: 11/18/2022] Open
Abstract
Management of spinal deformities in a patient with arthrogryposis can be challenging for spine surgeons. The literature about the accompaniment of scoliosis; the most common spine deformity reported in arthrogryposis, is still poor. Moreover, the development of cervical kyphosis and thoracic lordoscoliosis in a patient with arthrogryposis is much rare. This paper reports a 26-year-old medical doctor with arthrogryposis who had underwent thoracic lordoscoliosis surgery about ten years ago with T6-L1 internal rods and is now presented with cervical kyphosis and C3-C4 cord stenosis, which made him a candidate for cervical cord decompression surgery.
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22
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Li M, Andersson-Lendahl M, Sejersen T, Arner A. Knockdown of fast skeletal myosin-binding protein C in zebrafish results in a severe skeletal myopathy. ACTA ACUST UNITED AC 2016; 147:309-22. [PMID: 27022191 PMCID: PMC4810067 DOI: 10.1085/jgp.201511452] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 02/26/2016] [Indexed: 12/30/2022]
Abstract
MyBPC: A muscle protein for all seasons. Myosin-binding protein C (MyBPC) in the muscle sarcomere interacts with several contractile and structural proteins. Mutations in the cardiac isoform (MyBPC-3) in humans, or animal knockout, are associated with cardiomyopathy. Function of the fast skeletal isoform (MyBPC-2) in living muscles is less understood. This question was addressed using zebrafish models, combining gene expression data with functional analysis of contractility and small-angle x-ray diffraction measurements of filament structure. Fast skeletal MyBPC-2B, the major isoform, was knocked down by >50% using morpholino antisense nucleotides. These morphants exhibited a skeletal myopathy with elevated apoptosis and up-regulation of factors associated with muscle protein degradation. Morphant muscles had shorter sarcomeres with a broader length distribution, shorter actin filaments, and a wider interfilament spacing compared with controls, suggesting that fast skeletal MyBPC has a role in sarcomere assembly. Active force was reduced more than expected from the decrease in muscle size, suggesting that MyBPC-2 is required for optimal force generation at the cross-bridge level. The maximal shortening velocity was significantly increased in the MyBPC-2 morphants, but when related to the sarcomere length, the difference was smaller, reflecting that the decrease in MyBPC-2B content and the resulting myopathy were accompanied by only a minor influence on filament shortening kinetics. In the controls, equatorial patterns from small-angle x-ray scattering revealed that comparatively few cross-bridges are attached (as evaluated by the intensity ratio of the 11 and 10 equatorial reflections) during active contraction. X-ray scattering data from relaxed and contracting morphants were not significantly different from those in controls. However, the increase in the 11:10 intensity ratio in rigor was lower compared with that in controls, possibly reflecting effects of MyBPC on the cross-bridge interactions. In conclusion, lack of MyBPC-2 results in a severe skeletal myopathy with structural changes and muscle weakness.
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Affiliation(s)
- Mei Li
- Department of Physiology and Pharmacology, Department of Cell and Molecular Biology, and Department of Women's and Children's Health, Karolinska Institutet, SE 171 77 Stockholm, Sweden
| | - Monika Andersson-Lendahl
- Department of Physiology and Pharmacology, Department of Cell and Molecular Biology, and Department of Women's and Children's Health, Karolinska Institutet, SE 171 77 Stockholm, Sweden
| | - Thomas Sejersen
- Department of Physiology and Pharmacology, Department of Cell and Molecular Biology, and Department of Women's and Children's Health, Karolinska Institutet, SE 171 77 Stockholm, Sweden
| | - Anders Arner
- Department of Physiology and Pharmacology, Department of Cell and Molecular Biology, and Department of Women's and Children's Health, Karolinska Institutet, SE 171 77 Stockholm, Sweden
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23
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Michie KA, Kwan AH, Tung CS, Guss JM, Trewhella J. A Highly Conserved Yet Flexible Linker Is Part of a Polymorphic Protein-Binding Domain in Myosin-Binding Protein C. Structure 2016; 24:2000-2007. [PMID: 27720588 DOI: 10.1016/j.str.2016.08.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 08/08/2016] [Accepted: 08/29/2016] [Indexed: 10/20/2022]
Abstract
The nuclear magnetic resonance (NMR) structure of the tri-helix bundle (THB) of the m-domain plus C2 (ΔmC2) of myosin-binding protein C (MyBP-C) has revealed a highly flexible seven-residue linker between the structured THB and C2. Bioinformatics shows significant patterns of conservation across the THB-linker sequence, with the linker containing a strictly conserved serine in all MyBP-C isoforms. Clinically linked mutations further support the functional significance of the THB-linker region. NMR, small-angle X-ray scattering, and binding studies show the THB-linker plus the first ten residues of C2 undergo dramatic changes when ΔmC2 binds Ca2+-calmodulin, with the linker and C2 N-terminal residues contributing significantly to the affinity. Modeling of all available experimental data indicates that the THB tertiary structure must be disrupted to form the complex. These results are discussed in the context of the THB-linker and the N-terminal residues of C2 forming a polymorphic binding domain that could accommodate multiple binding partners in the dynamic sarcomere.
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Affiliation(s)
- Katharine A Michie
- School of Life and Environmental Sciences, The University of Sydney, NSW 2006, Australia
| | - Ann H Kwan
- School of Life and Environmental Sciences, The University of Sydney, NSW 2006, Australia
| | - Chang-Shung Tung
- Theoretical Biology and Biophysics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; Biology Department, University of New Mexico, Albuquerque, NM 87131, USA
| | - J Mitchell Guss
- School of Life and Environmental Sciences, The University of Sydney, NSW 2006, Australia
| | - Jill Trewhella
- School of Life and Environmental Sciences, The University of Sydney, NSW 2006, Australia.
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24
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Geist J, Kontrogianni-Konstantopoulos A. MYBPC1, an Emerging Myopathic Gene: What We Know and What We Need to Learn. Front Physiol 2016; 7:410. [PMID: 27683561 PMCID: PMC5021714 DOI: 10.3389/fphys.2016.00410] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 08/31/2016] [Indexed: 11/22/2022] Open
Abstract
Myosin Binding Protein-C (MyBP-C) comprises a family of accessory proteins that includes the cardiac, slow skeletal, and fast skeletal isoforms. The three isoforms share structural and sequence homology, and localize at the C-zone of the sarcomeric A-band where they interact with thick and thin filaments to regulate the cycling of actomyosin crossbridges. The cardiac isoform, encoded by MYBPC3, has been extensively studied over the last several decades due to its high mutational rate in congenital hypertrophic and dilated cardiomyopathy. It is only recently, however, that the MYBPC1 gene encoding the slow skeletal isoform (sMyBP-C) has gained attention. Accordingly, during the last 5 years it has been shown that MYBPC1 undergoes extensive exon shuffling resulting in the generation of multiple slow variants, which are co-expressed in different combinations and amounts in both slow and fast skeletal muscles. The sMyBP-C variants are subjected to PKA- and PKC-mediated phosphorylation in constitutive and alternatively spliced sites. More importantly, missense, and nonsense mutations in MYBPC1 have been directly linked with the development of severe and lethal forms of distal arthrogryposis myopathy and muscle tremors. Currently, there is no mammalian animal model of sMyBP-C, but new technologies including CRISPR/Cas9 and xenografting of human biopsies into immunodeficient mice could provide unique ways to study the regulation and roles of sMyBP-C in health and disease.
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Affiliation(s)
- Janelle Geist
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine Baltimore, MD, USA
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25
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Ekhilevitch N, Kurolap A, Oz-Levi D, Mory A, Hershkovitz T, Ast G, Mandel H, Baris HN. Expanding the MYBPC1 phenotypic spectrum: a novel homozygous mutation causes arthrogryposis multiplex congenita. Clin Genet 2016; 90:84-9. [PMID: 26661508 DOI: 10.1111/cge.12707] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Revised: 12/03/2015] [Accepted: 12/04/2015] [Indexed: 12/30/2022]
Abstract
Arthrogryposis multiplex congenita (AMC) is characterized by heterogeneous nonprogressive multiple joint contractures appearing at birth. We present a consanguineous Israeli-Druze family with several members presenting with AMC. A variable intra-familial phenotype and pected autosomal recessive inheritance prompted molecular diagnosis by whole-exome sequencing. Variant analysis focused on rare homozygous changes, revealed a missense variant in MYBPC1, NM_002465:c.556G>A (p.E286K), affecting the last nucleotide of Exon 8. This novel variant was not observed in the common variant databases and co-segregated as expected within the extended family. MYBPC1 encodes a slow skeletal muscle isoform, essential for muscle contraction. Heterozygous mutations in this gene are associated with distal arthrogryposis types 1b and 2, whereas a homozygous nonsense mutation is implicated in one family with lethal congenital contractural syndrome 4. We present a novel milder MYBPC1 homozygous phenotype.
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Affiliation(s)
- N Ekhilevitch
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - A Kurolap
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - D Oz-Levi
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - A Mory
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - T Hershkovitz
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - G Ast
- Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - H Mandel
- Metabolic Unit, Rambam Health Care Campus, Haifa, Israel.,Rappaport School of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - H N Baris
- The Genetics Institute, Rambam Health Care Campus, Haifa, Israel.,Rappaport School of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
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26
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Bayram Y, Karaca E, Coban Akdemir Z, Yilmaz EO, Tayfun GA, Aydin H, Torun D, Bozdogan ST, Gezdirici A, Isikay S, Atik MM, Gambin T, Harel T, El-Hattab AW, Charng WL, Pehlivan D, Jhangiani SN, Muzny DM, Karaman A, Celik T, Yuregir OO, Yildirim T, Bayhan IA, Boerwinkle E, Gibbs RA, Elcioglu N, Tuysuz B, Lupski JR. Molecular etiology of arthrogryposis in multiple families of mostly Turkish origin. J Clin Invest 2016; 126:762-78. [PMID: 26752647 DOI: 10.1172/jci84457] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 11/25/2015] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Arthrogryposis, defined as congenital joint contractures in 2 or more body areas, is a clinical sign rather than a specific disease diagnosis. To date, more than 400 different disorders have been described that present with arthrogryposis, and variants of more than 220 genes have been associated with these disorders; however, the underlying molecular etiology remains unknown in the considerable majority of these cases. METHODS We performed whole exome sequencing (WES) of 52 patients with clinical presentation of arthrogryposis from 48 different families. RESULTS Affected individuals from 17 families (35.4%) had variants in known arthrogryposis-associated genes, including homozygous variants of cholinergic γ nicotinic receptor (CHRNG, 6 subjects) and endothelin converting enzyme-like 1 (ECEL1, 4 subjects). Deleterious variants in candidate arthrogryposis-causing genes (fibrillin 3 [FBN3], myosin IXA [MYO9A], and pleckstrin and Sec7 domain containing 3 [PSD3]) were identified in 3 families (6.2%). Moreover, in 8 families with a homozygous mutation in an arthrogryposis-associated gene, we identified a second locus with either a homozygous or compound heterozygous variant in a candidate gene (myosin binding protein C, fast type [MYBPC2] and vacuolar protein sorting 8 [VPS8], 2 families, 4.2%) or in another disease-associated genes (6 families, 12.5%), indicating a potential mutational burden contributing to disease expression. CONCLUSION In 58.3% of families, the arthrogryposis manifestation could be explained by a molecular diagnosis; however, the molecular etiology in subjects from 20 families remained unsolved by WES. Only 5 of these 20 unrelated subjects had a clinical presentation consistent with amyoplasia; a phenotype not thought to be of genetic origin. Our results indicate that increased use of genome-wide technologies will provide opportunities to better understand genetic models for diseases and molecular mechanisms of genetically heterogeneous disorders, such as arthrogryposis. FUNDING This work was supported in part by US National Human Genome Research Institute (NHGRI)/National Heart, Lung, and Blood Institute (NHLBI) grant U54HG006542 to the Baylor-Hopkins Center for Mendelian Genomics, and US National Institute of Neurological Disorders and Stroke (NINDS) grant R01NS058529 to J.R. Lupski.
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27
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Kenan DJ, Mieczkowski PA, Burger-Calderon R, Singh HK, Nickeleit V. The oncogenic potential of BK-polyomavirus is linked to viral integration into the human genome. J Pathol 2015; 237:379-89. [PMID: 26172456 PMCID: PMC5042064 DOI: 10.1002/path.4584] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2015] [Revised: 06/22/2015] [Accepted: 07/03/2015] [Indexed: 12/16/2022]
Abstract
It has been suggested that BK-polyomavirus is linked to oncogenesis via high expression levels of large T-antigen in some urothelial neoplasms arising following kidney transplantation. However, a causal association between BK-polyomavirus, large T-antigen expression and oncogenesis has never been demonstrated in humans. Here we describe an investigation using high-throughput sequencing of tumour DNA obtained from an urothelial carcinoma arising in a renal allograft. We show that a novel BK-polyomavirus strain, named CH-1, is integrated into exon 26 of the myosin-binding protein C1 gene (MYBPC1) on chromosome 12 in tumour cells but not in normal renal cells. Integration of the BK-polyomavirus results in a number of discrete alterations in viral gene expression, including: (a) disruption of VP1 protein expression and robust expression of large T-antigen; (b) preclusion of viral replication; and (c) deletions in the non-coding control region (NCCR), with presumed alterations in promoter feedback loops. Viral integration disrupts one MYBPC1 gene copy and likely alters its expression. Circular episomal BK-polyomavirus gene sequences are not found, and the renal allograft shows no productive polyomavirus infection or polyomavirus nephropathy. These findings support the hypothesis that integration of polyomaviruses is essential to tumourigenesis. It is likely that dysregulation of large T-antigen, with persistent over-expression in non-lytic cells, promotes cell growth, genetic instability and neoplastic transformation.
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MESH Headings
- Allografts
- Antigens, Viral, Tumor/genetics
- BK Virus/genetics
- BK Virus/metabolism
- BK Virus/pathogenicity
- Biopsy
- Capsid Proteins/genetics
- Carcinoma/genetics
- Carcinoma/pathology
- Carcinoma/surgery
- Carcinoma/virology
- Carrier Proteins/genetics
- Cell Proliferation
- Cell Transformation, Viral
- Chromosomes, Human, Pair 12
- Gene Expression Regulation, Neoplastic
- Gene Expression Regulation, Viral
- Genome, Human
- Genomic Instability
- Humans
- Kidney Neoplasms/genetics
- Kidney Neoplasms/pathology
- Kidney Neoplasms/surgery
- Kidney Neoplasms/virology
- Kidney Transplantation/adverse effects
- Male
- Microscopy, Electron
- Middle Aged
- Molecular Diagnostic Techniques
- Oncogene Proteins, Viral/genetics
- Oncogene Proteins, Viral/metabolism
- Polyomavirus Infections/virology
- Tumor Virus Infections/virology
- Urothelium/pathology
- Urothelium/virology
- Virus Integration
- Virus Replication
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Affiliation(s)
- Daniel J Kenan
- Division of Nephropathology, Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC, USA
| | | | | | - Harsharan K Singh
- Division of Nephropathology, Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Volker Nickeleit
- Division of Nephropathology, Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC, USA
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28
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Wiedemar N, Riedi AK, Jagannathan V, Drögemüller C, Meylan M. Genetic Abnormalities in a Calf with Congenital Increased Muscular Tonus. J Vet Intern Med 2015; 29:1418-21. [PMID: 26289121 PMCID: PMC4858041 DOI: 10.1111/jvim.13599] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Revised: 05/06/2015] [Accepted: 07/21/2015] [Indexed: 12/12/2022] Open
Affiliation(s)
- N Wiedemar
- Institute of Genetics, Vetsuisse Faculty, University of Berne, Berne, Switzerland
| | - A-K Riedi
- Clinic for Ruminants, Vetsuisse Faculty, University of Berne, Berne, Switzerland
| | - V Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Berne, Berne, Switzerland
| | - C Drögemüller
- Institute of Genetics, Vetsuisse Faculty, University of Berne, Berne, Switzerland
| | - M Meylan
- Clinic for Ruminants, Vetsuisse Faculty, University of Berne, Berne, Switzerland
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29
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Lourenço Dos Santos S, Baraibar MA, Lundberg S, Eeg-Olofsson O, Larsson L, Friguet B. Oxidative proteome alterations during skeletal muscle ageing. Redox Biol 2015; 5:267-274. [PMID: 26073261 PMCID: PMC4475901 DOI: 10.1016/j.redox.2015.05.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 05/21/2015] [Accepted: 05/29/2015] [Indexed: 01/06/2023] Open
Abstract
Sarcopenia corresponds to the degenerative loss of skeletal muscle mass, quality, and strength associated with ageing and leads to a progressive impairment of mobility and quality of life. However, the cellular and molecular mechanisms involved in this process are not completely understood. A hallmark of cellular and tissular ageing is the accumulation of oxidatively modified (carbonylated) proteins, leading to a decreased quality of the cellular proteome that could directly impact on normal cellular functions. Although increased oxidative stress has been reported during skeletal muscle ageing, the oxidized protein targets, also referred as to the 'oxi-proteome' or 'carbonylome', have not been characterized yet. To better understand the mechanisms by which these damaged proteins build up and potentially affect muscle function, proteins targeted by these modifications have been identified in human rectus abdominis muscle obtained from young and old healthy donors using a bi-dimensional gel electrophoresis-based proteomic approach coupled with immunodetection of carbonylated proteins. Among evidenced protein spots, 17 were found as increased carbonylated in biopsies from old donors comparing to young counterparts. These proteins are involved in key cellular functions such as cellular morphology and transport, muscle contraction and energy metabolism. Importantly, impairment of these pathways has been described in skeletal muscle during ageing. Functional decline of these proteins due to irreversible oxidation may therefore impact directly on the above-mentioned pathways, hence contributing to the generation of the sarcopenic phenotype.
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Affiliation(s)
- Sofia Lourenço Dos Santos
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8256, Biological Adaptation and Ageing-IBPS, Paris F-75005, France; CNRS UMR-8256, Paris F-75005, France; Inserm U1164, Paris F-75005, France
| | - Martin A Baraibar
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8256, Biological Adaptation and Ageing-IBPS, Paris F-75005, France; CNRS UMR-8256, Paris F-75005, France; Inserm U1164, Paris F-75005, France
| | - Staffan Lundberg
- Department of Women's and Children's Health, Uppsala University, Uppsala SE-751 82, Sweden
| | - Orvar Eeg-Olofsson
- Department of Women's and Children's Health, Uppsala University, Uppsala SE-751 82, Sweden
| | - Lars Larsson
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm SE-171 77, Sweden; Department of Clinical Neuroscience, Clinical Neurophysiology, Karolinska Institutet, Stockholm SE-171 77, Sweden
| | - Bertrand Friguet
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8256, Biological Adaptation and Ageing-IBPS, Paris F-75005, France; CNRS UMR-8256, Paris F-75005, France; Inserm U1164, Paris F-75005, France.
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The sarcomeric M-region: a molecular command center for diverse cellular processes. BIOMED RESEARCH INTERNATIONAL 2015; 2015:714197. [PMID: 25961035 PMCID: PMC4413555 DOI: 10.1155/2015/714197] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 02/08/2015] [Indexed: 02/07/2023]
Abstract
The sarcomeric M-region anchors thick filaments and withstands the mechanical stress of contractions by deformation, thus enabling distribution of physiological forces along the length of thick filaments. While the role of the M-region in supporting myofibrillar structure and contractility is well established, its role in mediating additional cellular processes has only recently started to emerge. As such, M-region is the hub of key protein players contributing to cytoskeletal remodeling, signal transduction, mechanosensing, metabolism, and proteasomal degradation. Mutations in genes encoding M-region related proteins lead to development of severe and lethal cardiac and skeletal myopathies affecting mankind. Herein, we describe the main cellular processes taking place at the M-region, other than thick filament assembly, and discuss human myopathies associated with mutant or truncated M-region proteins.
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Li X, Zhong B, Han W, Zhao N, Liu W, Sui Y, Wang Y, Lu Y, Wang H, Li J, Jiang M. Two novel mutations in myosin binding protein C slow causing distal arthrogryposis type 2 in two large Han Chinese families may suggest important functional role of immunoglobulin domain C2. PLoS One 2015; 10:e0117158. [PMID: 25679999 PMCID: PMC4332675 DOI: 10.1371/journal.pone.0117158] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 12/18/2014] [Indexed: 12/19/2022] Open
Abstract
Distal arthrogryposes (DAs) are a group of disorders that mainly involve the distal parts of the limbs and at least ten different DAs have been described to date. DAs are mostly described as autosomal dominant disorders with variable expressivity and incomplete penetrance, but recently autosomal recessive pattern was reported in distal arthrogryposis type 5D. Mutations in the contractile genes are found in about 50% of all DA patients. Of these genes, mutations in the gene encoding myosin binding protein C slow MYBPC1 were recently identified in two families with distal arthrogryposis type 1B. Here, we described two large Chinese families with autosomal dominant distal arthrogryposis type 2(DA2) with incomplete penetrance and variable expressivity. Some unique overextension contractures of the lower limbs and some distinctive facial features were present in our DA2 pedigrees. We performed follow-up DNA sequencing after linkage mapping and first identified two novel MYBPC1 mutations (c.1075G>A [p.E359K] and c.956C>T [p.P319L]) responsible for these Chinese DA2 families of which one introduced by germline mosacism. Each mutation was found to cosegregate with the DA2 phenotype in each family but not in population controls. Both substitutions occur within C2 immunoglobulin domain, which together with C1 and the M motif constitute the binding site for the S2 subfragment of myosin. Our results expand the phenotypic spectrum of MYBPC1-related arthrogryposis multiplex congenita (AMC). We also proposed the possible molecular mechanisms that may underlie the pathogenesis of DA2 myopathy associated with these two substitutions in MYBPC1.
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Affiliation(s)
- Xuefu Li
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Bomeng Zhong
- Emergency department, Nanjing First Hospital, Nanjing, China
| | - Weitian Han
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Ning Zhao
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Wei Liu
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Yu Sui
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Yawen Wang
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Yongping Lu
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Hong Wang
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Jianxin Li
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Miao Jiang
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
- * E-mail:
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32
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A syndrome of congenital microcephaly, intellectual disability and dysmorphism with a homozygous mutation in FRMD4A. Eur J Hum Genet 2014; 23:1729-34. [PMID: 25388005 DOI: 10.1038/ejhg.2014.241] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2014] [Revised: 08/13/2014] [Accepted: 09/30/2014] [Indexed: 11/08/2022] Open
Abstract
A consanguineous Bedouin Israeli kindred presented with a novel autosomal recessive intellectual disability syndrome of congenital microcephaly, low anterior hairline, bitemporal narrowing, low-set protruding ears, strabismus and tented thick eyebrows with sparse hair in their medial segment. Brain imaging demonstrated various degrees of agenesis of corpus callosum and hypoplasia of the vermis and cerebellum. Genome-wide linkage analysis followed by fine mapping defined a 7.67 Mb disease-associated locus (LOD score 4.99 at θ=0 for marker D10S1653). Sequencing of the 48 genes within the locus identified a single non-synonymous homozygous duplication frameshift mutation of 13 nucleotides (c.2134_2146dup13) within the coding region of FRMD4A, that was common to all affected individuals and not found in 180 non-related Bedouin controls. Three of 50 remotely related healthy controls of the same tribe were heterozygous for the mutation. FRMD4A, member of the FERM superfamily, is involved in cell structure, transport and signaling. It regulates cell polarity by playing an important role in the activation of ARF6, mediating the interaction between Par3 and the ARF6 guanine nucleotide exchange factor. ARF6 is known to modulate cell polarity in neurons, and regulates dendritic branching in hippocampal neurons and neurite outgrowth. The FRMD4 domain that is essential for determining cell polarity through interaction with Par3 is truncated by the c.2134_2146dup13 mutation. FRMD4A polymorphisms were recently suggested to be a risk factor for Alzheimer's disease. We now show a homozygous frameshift mutation of the same gene in a severe neurologic syndrome with unique dysmorphism.
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Filges I, Friedman JM. Exome sequencing for gene discovery in lethal fetal disorders--harnessing the value of extreme phenotypes. Prenat Diagn 2014; 35:1005-9. [PMID: 25046514 DOI: 10.1002/pd.4464] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Revised: 06/14/2014] [Accepted: 07/16/2014] [Indexed: 12/18/2022]
Abstract
Massively parallel sequencing has revolutionized our understanding of Mendelian disorders, and many novel genes have been discovered to cause disease phenotypes when mutant. At the same time, next-generation sequencing approaches have enabled non-invasive prenatal testing of free fetal DNA in maternal blood. However, little attention has been paid to using whole exome and genome sequencing strategies for gene identification in fetal disorders that are lethal in utero, because they can appear to be sporadic and Mendelian inheritance may be missed. We present challenges and advantages of applying next-generation sequencing approaches to gene discovery in fetal malformation phenotypes and review recent successful discovery approaches. We discuss the implication and significance of recessive inheritance and cross-species phenotyping in fetal lethal conditions. Whole exome sequencing can be used in individual families with undiagnosed lethal congenital anomaly syndromes to discover causal mutations, provided that prior to data analysis, the fetal phenotype can be correlated to a particular developmental pathway in embryogenesis. Cross-species phenotyping allows providing further evidence for causality of discovered variants in genes involved in those extremely rare phenotypes and will increase our knowledge about normal and abnormal human developmental processes. Ultimately, families will benefit from the option of early prenatal diagnosis.
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Affiliation(s)
- Isabel Filges
- Medical Genetics, Department of Biomedicine, University Hospital Basel, University of Basel, Basel, Switzerland.,Department of Medical Genetics, Children's and Women's Hospital, Child and Family Research Institute, University of British Columbia, Vancouver, Canada
| | - Jan M Friedman
- Department of Medical Genetics, Children's and Women's Hospital, Child and Family Research Institute, University of British Columbia, Vancouver, Canada
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Bahlo M, Tankard R, Lukic V, Oliver KL, Smith KR. Using familial information for variant filtering in high-throughput sequencing studies. Hum Genet 2014; 133:1331-41. [PMID: 25129038 PMCID: PMC4185103 DOI: 10.1007/s00439-014-1479-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 08/07/2014] [Indexed: 12/30/2022]
Abstract
High-throughput sequencing studies (HTS) have been highly successful in identifying the genetic causes of human disease, particularly those following Mendelian inheritance. Many HTS studies to date have been performed without utilizing available family relationships between samples. Here, we discuss the many merits and occasional pitfalls of using identity by descent information in conjunction with HTS studies. These methods are not only applicable to family studies but are also useful in cohorts of apparently unrelated, ‘sporadic’ cases and small families underpowered for linkage and allow inference of relationships between individuals. Incorporating familial/pedigree information not only provides powerful filtering options for the extensive variant lists that are usually produced by HTS but also allows valuable quality control checks, insights into the genetic model and the genotypic status of individuals of interest. In particular, these methods are valuable for challenging discovery scenarios in HTS analysis, such as in the study of populations poorly represented in variant databases typically used for filtering, and in the case of poor-quality HTS data.
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Affiliation(s)
- Melanie Bahlo
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, 3052, Australia,
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35
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Patel N, Smith LL, Faqeih E, Mohamed J, Gupta VA, Alkuraya FS. ZBTB42 mutation defines a novel lethal congenital contracture syndrome (LCCS6). Hum Mol Genet 2014; 23:6584-93. [PMID: 25055871 DOI: 10.1093/hmg/ddu384] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Lethal congenital contracture syndrome (LCCS) is a lethal autosomal recessive form of arthrogryposis multiplex congenita (AMC). LCCS is genetically heterogeneous with mutations in five genes identified to date, all with a role in the innervation or contractile apparatus of skeletal muscles. In a consanguineous Saudi family with multiple stillbirths presenting with LCCS, we excluded linkage to all known LCCS loci and combined autozygome analysis and whole-exome sequencing to identify a novel homozygous variant in ZBTB42, which had been shown to be enriched in skeletal muscles, especially at the neuromuscular junction. Knockdown experiments of zbtb42 in zebrafish consistently resulted in grossly abnormal skeletal muscle development and myofibrillar disorganization at the microscopic level. This severe muscular phenotype is successfully rescued with overexpression of the human wild-type ZBTB42 gene, but not with the mutant form of ZBTB42 that models the human missense change. Our data assign a novel muscular developmental phenotype to ZBTB42 in vertebrates and establish a new LCCS6 type caused by ZBTB42 mutation.
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Affiliation(s)
- Nisha Patel
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Laura L Smith
- Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Eissa Faqeih
- Department of Pediatrics, King Fahad Medical City, Riyadh, Saudi Arabia and
| | - Jawahir Mohamed
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Vandana A Gupta
- Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA,
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia, Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
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36
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Feinstein M, Flusser H, Lerman-Sagie T, Ben-Zeev B, Lev D, Agamy O, Cohen I, Kadir R, Sivan S, Leshinsky-Silver E, Markus B, Birk OS. VPS53 mutations cause progressive cerebello-cerebral atrophy type 2 (PCCA2). J Med Genet 2014; 51:303-8. [PMID: 24577744 DOI: 10.1136/jmedgenet-2013-101823] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Progressive cerebello-cerebral atrophy (PCCA) leading to profound mental retardation, progressive microcephaly, spasticity and early onset epilepsy, was diagnosed in four non-consanguineous apparently unrelated families of Jewish Moroccan ancestry. Common founder mutation(s) were assumed. METHODS Genome-wide linkage analysis and whole exome sequencing were done, followed by realtime PCR and immunofluorescent microscopy. RESULTS Genome-wide linkage analysis mapped the disease-associated gene to 0.5 Mb on chromosome 17p13.3. Whole exome sequencing identified only two mutations within this locus, which were common to the affected individuals: compound heterozygous mutations in VPS53, segregating as expected for autosomal recessive heredity within all four families, and common in Moroccan Jews (∼1:37 carrier rate). The Golgi-associated retrograde protein (GARP) complex is involved in the retrograde pathway recycling endocytic vesicles to Golgi; c.2084A>G and c.1556+5G>A VPS53 founder mutations are predicted to affect the C-terminal domain of VPS53, known to be critical to its role as part of this complex. Immunofluorescent microscopy demonstrated swollen and abnormally numerous CD63 positive vesicular bodies, likely intermediate recycling/late endosomes, in fibroblasts of affected individuals. CONCLUSIONS Autosomal recessive PCCA type 2 is caused by VPS53 mutations.
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Affiliation(s)
- Miora Feinstein
- Morris Kahn Laboratory of Human Genetics at the National Institute of Biotechnology in the Negev and Faculty of Health Sciences, Ben Gurion University, Beer Sheva, Israel
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37
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Markus B, Alshafee I, Birk OS. Deciphering the fine-structure of tribal admixture in the Bedouin population using genomic data. Heredity (Edinb) 2014; 112:182-9. [PMID: 24084643 PMCID: PMC3907104 DOI: 10.1038/hdy.2013.90] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 07/03/2013] [Accepted: 08/22/2013] [Indexed: 02/04/2023] Open
Abstract
The Bedouin Israeli population is highly inbred and structured with a very high prevalence of recessive diseases. Many studies in the past two decades focused on linkage analysis in large, multiple consanguineous pedigrees of this population. The advent of high-throughput technologies motivated researchers to search for rare variants shared between smaller pedigrees, integrating data from clinically similar yet seemingly non-related sporadic cases. However, such analyses are challenging because, without pedigree data, there is no prior knowledge regarding possible relatedness between the sporadic cases. Here, we describe models and techniques for the study of relationships between pedigrees and use them for the inference of tribal co-ancestry, delineating the complex social interactions between different tribes in the Negev Bedouins of southern Israel. Through our analysis, we differentiate between tribes that share many yet small genomic segments because of co-ancestry versus tribes that share larger segments because of recent admixture. The emergent pattern is well correlated with the prevalence of rare mutations in the different tribes. Tribes that do not intermarry, mostly because of social restrictions, hold private mutations, whereas tribes that do intermarry demonstrate a genetic flow of mutations between them. Thus, social structure within an inbred community can be delineated through genomic data, with implications to genetic counseling and genetic mapping.
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Affiliation(s)
- B Markus
- The Morris Kahn Laboratory of Human Genetics
at the National Institute for Biotechnology in the Negev (NIBN) and Faculty of Health
Sciences, Ben Gurion University, Beer-Sheva, Israel
| | - I Alshafee
- Soroka Medical Center, The Genetics
Institute, Beer-sheva, Israel
| | - O S Birk
- The Morris Kahn Laboratory of Human Genetics
at the National Institute for Biotechnology in the Negev (NIBN) and Faculty of Health
Sciences, Ben Gurion University, Beer-Sheva, Israel
- Soroka Medical Center, The Genetics
Institute, Beer-sheva, Israel
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van Dijk SJ, Bezold KL, Harris SP. Earning stripes: myosin binding protein-C interactions with actin. Pflugers Arch 2014; 466:445-50. [PMID: 24442149 DOI: 10.1007/s00424-013-1432-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 12/23/2013] [Indexed: 01/23/2023]
Abstract
Myosin binding protein-C (MyBP-C) was first discovered as an impurity during the purification of myosin from skeletal muscle. However, soon after its discovery, MyBP-C was also shown to bind actin. While the unique functional implications for a protein that could cross-link thick and thin filaments together were immediately recognized, most early research nonetheless focused on interactions of MyBP-C with the thick filament. This was in part because interactions of MyBP-C with the thick filament could adequately explain most (but not all) effects of MyBP-C on actomyosin interactions and in part because the specificity of actin binding was uncertain. However, numerous recent studies have now established that MyBP-C can indeed bind to actin through multiple binding sites, some of which are highly specific. Many of these interactions involve critical regulatory domains of MyBP-C that are also reported to interact with myosin. Here we review current evidence supporting MyBP-C interactions with actin and discuss these findings in terms of their ability to account for the functional effects of MyBP-C. We conclude that the influence of MyBP-C on muscle contraction can be explained equally well by interactions with actin as by interactions with myosin. However, because data showing that MyBP-C binds to either myosin or actin has come almost exclusively from in vitro biochemical studies, the challenge for future studies is to define which binding partner(s) MyBP-C interacts with in vivo.
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Affiliation(s)
- Sabine J van Dijk
- Department of Cellular and Molecular Medicine, University of Arizona, Medical Research Building, 1656 East Mabel Street, Tucson, AZ, 85724-5217, USA
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The application of next-generation sequencing in the autozygosity mapping of human recessive diseases. Hum Genet 2013; 132:1197-211. [PMID: 23907654 DOI: 10.1007/s00439-013-1344-x] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 07/20/2013] [Indexed: 02/08/2023]
Abstract
Autozygosity, or the inheritance of two copies of an ancestral allele, has the potential to not only reveal phenotypes caused by biallelic mutations in autosomal recessive genes, but to also facilitate the mapping of such mutations by flagging the surrounding haplotypes as tractable runs of homozygosity (ROH), a process known as autozygosity mapping. Since SNPs replaced microsatellites as markers for the purpose of genomewide identification of ROH, autozygosity mapping of Mendelian genes has witnessed a significant acceleration. Historically, successful mapping traditionally required favorable family structure that permits the identification of an autozygous interval that is amenable to candidate gene selection and confirmation by Sanger sequencing. This requirement presented a major bottleneck that hindered the utilization of simplex cases and many multiplex families with autosomal recessive phenotypes. However, the advent of next-generation sequencing that enables massively parallel sequencing of DNA has largely bypassed this bottleneck and thus ushered in an era of unprecedented pace of Mendelian disease gene discovery. The ability to identify a single causal mutation among a massive number of variants that are uncovered by next-generation sequencing can be challenging, but applying autozygosity as a filter can greatly enhance the enrichment process and its throughput. This review will discuss the power of combining the best of both techniques in the mapping of recessive disease genes and offer some tips to troubleshoot potential limitations.
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Ha K, Buchan JG, Alvarado DM, McCall K, Vydyanath A, Luther PK, Goldsmith MI, Dobbs MB, Gurnett CA. MYBPC1 mutations impair skeletal muscle function in zebrafish models of arthrogryposis. Hum Mol Genet 2013; 22:4967-77. [PMID: 23873045 DOI: 10.1093/hmg/ddt344] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Myosin-binding protein C1 (MYBPC1) is an abundant skeletal muscle protein that is expressed predominantly in slow-twitch muscle fibers. Human MYBPC1 mutations are associated with distal arthrogryposis type 1 and lethal congenital contracture syndrome type 4. As MYBPC1 function is incompletely understood, the mechanism by which human mutations result in contractures is unknown. Here, we demonstrate using antisense morpholino knockdown, that mybpc1 is required for embryonic motor activity and survival in a zebrafish model of arthrogryposis. Mybpc1 morphant embryos have severe body curvature, cardiac edema, impaired motor excitation and are delayed in hatching. Myofibril organization is selectively impaired in slow skeletal muscle and sarcomere numbers are greatly reduced in mybpc1 knockdown embryos, although electron microscopy reveals normal sarcomere structure. To evaluate the effects of human distal arthrogryposis mutations, mybpc1 mRNAs containing the corresponding human W236R and Y856H MYBPC1 mutations were injected into embryos. Dominant-negative effects of these mutations were suggested by the resultant mild bent body curvature, decreased motor activity, as well as impaired overall survival compared with overexpression of wild-type RNA. These results demonstrate a critical role for mybpc1 in slow skeletal muscle development and establish zebrafish as a tractable model of human distal arthrogryposis.
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Ackermann MA, Patel PD, Valenti J, Takagi Y, Homsher E, Sellers JR, Kontrogianni-Konstantopoulos A. Loss of actomyosin regulation in distal arthrogryposis myopathy due to mutant myosin binding protein-C slow. FASEB J 2013; 27:3217-28. [PMID: 23657818 DOI: 10.1096/fj.13-228882] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Myosin binding protein C (MyBP-C) is expressed in striated muscles, where it plays key roles in the modulation of actomyosin cross-bridges. Slow MyBP-C (sMyBP-C) consists of multiple variants sharing common domains but also containing unique segments within the NH2 and COOH termini. Two missense mutations in the NH2 terminus (W236R) and COOH terminus (Y856H) of sMyBP-C have been causally linked to the development of distal arthrogryposis-1 (DA-1), a severe skeletal muscle disorder. Using a combination of in vitro binding and motility assays, we show that the COOH terminus mediates binding of sMyBP-C to thick filaments, while the NH2 terminus modulates the formation of actomyosin cross-bridges in a variant-specific manner. Consistent with this, a recombinant NH2-terminal peptide that excludes residues 34-59 reduces the sliding velocity of actin filaments past myosin heads from 9.0 ± 1.3 to 5.7 ± 1.0 μm/s at 0.1 μM, while a recombinant peptide that excludes residues 21-59 fails to do so. Notably, the actomyosin regulatory properties of sMyBP-C are completely abolished by the presence of the DA-1 mutations. In summary, our studies are the first to show that the NH2 and COOH termini of sMyBP-C have distinct functions, which are regulated by differential splicing, and are compromized by the presence of missense point mutations linked to muscle disease.
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Affiliation(s)
- Maegen A Ackermann
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 108 N. Greene St, Baltimore, MD 21201, USA
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Emre Onat O, Gulsuner S, Bilguvar K, Nazli Basak A, Topaloglu H, Tan M, Tan U, Gunel M, Ozcelik T. Missense mutation in the ATPase, aminophospholipid transporter protein ATP8A2 is associated with cerebellar atrophy and quadrupedal locomotion. Eur J Hum Genet 2013; 21:281-5. [PMID: 22892528 PMCID: PMC3573203 DOI: 10.1038/ejhg.2012.170] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Revised: 07/03/2012] [Accepted: 07/06/2012] [Indexed: 02/02/2023] Open
Abstract
Cerebellar ataxia, mental retardation and dysequilibrium syndrome is a rare and heterogeneous condition. We investigated a consanguineous family from Turkey with four affected individuals exhibiting the condition. Homozygosity mapping revealed that several shared homozygous regions, including chromosome 13q12. Targeted next-generation sequencing of an affected individual followed by segregation analysis, population screening and prediction approaches revealed a novel missense variant, p.I376M, in ATP8A2. The mutation lies in a highly conserved C-terminal transmembrane region of E1 E2 ATPase domain. The ATP8A2 gene is mainly expressed in brain and development, in particular cerebellum. Interestingly, an unrelated individual has been identified, in whom mental retardation and severe hypotonia is associated with a de novo t(10;13) balanced translocation resulting with the disruption of ATP8A2. These findings suggest that ATP8A2 is involved in the development of the cerebro-cerebellar structures required for posture and gait in humans.
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Affiliation(s)
- Onur Emre Onat
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, Ankara, Turkey
| | - Suleyman Gulsuner
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, Ankara, Turkey
| | - Kaya Bilguvar
- Department of Neurosurgery, Yale University School of Medicine, New Haven, CT, USA
- Department of Neurobiology, Yale University School of Medicine, New Haven, CT, USA
- Department of Genetics, Center for Human Genetics and Genomics and Program on Neurogenetics, Yale University School of Medicine, New Haven, CT, USA
| | - Ayse Nazli Basak
- Department of Molecular Biology and Genetics, NDAL Laboratory, School of Arts and Sciences, Bogazici University, Istanbul, Turkey
| | - Haluk Topaloglu
- Department of Pediatric Neurology, Ihsan Dogramaci Children's Hospital, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Meliha Tan
- Department of Neurology, Baskent University Faculty of Medicine, Ankara, Turkey
| | - Uner Tan
- Department of Physiology, Cukurova University Faculty of Medicine, Adana, Turkey
| | - Murat Gunel
- Department of Neurosurgery, Yale University School of Medicine, New Haven, CT, USA
- Department of Neurobiology, Yale University School of Medicine, New Haven, CT, USA
- Department of Genetics, Center for Human Genetics and Genomics and Program on Neurogenetics, Yale University School of Medicine, New Haven, CT, USA
| | - Tayfun Ozcelik
- Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, Ankara, Turkey
- Institute of Materials Science and Nanotechnology (UNAM), Bilkent University, Ankara, Turkey
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