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Alawneh I, Stosic A, Gonorazky H. Muscle MRI patterns for limb girdle muscle dystrophies: systematic review. J Neurol 2023:10.1007/s00415-023-11722-1. [PMID: 37129643 DOI: 10.1007/s00415-023-11722-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 04/06/2023] [Accepted: 04/11/2023] [Indexed: 05/03/2023]
Abstract
Limb girdle muscle dystrophies (LGMDs) are a group of inherited neuromuscular disorders comprising more than 20 genes. There have been increasing efforts to characterize this group with Muscle MRI. However, due to the complexity and similarities, the interpretation of the MRI patterns is usually done by experts in the field. Here, we proposed a step-by-step image interpretation of Muscle MRI in LGDM by evaluating the variability of muscle pattern involvement reported in the literature. A systematic review with an open start date to November 2022 was conducted to describe all LGMDs' muscle MRI patterns. Eighty-eight studies were included in the final review. Data were found to describe muscle MRI patterns for 15 out of 17 LGMDs types. Although the diagnosis of LGMDs is challenging despite the advanced genetic testing and other diagnostic modalities, muscle MRI is shown to help in the diagnosis of LGMDs. To further increase the yield for muscle MRI in the neuromuscular field, larger cohorts of patients need to be conducted.
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Affiliation(s)
- Issa Alawneh
- Department of Neurology, The Hospital for Sick Children, Toronto, Canada
| | - Ana Stosic
- Genetics and Genome Biology Program, The Hospital for Sick Children Research Institute, Toronto, Canada
| | - Hernan Gonorazky
- Department of Neurology, The Hospital for Sick Children, Toronto, Canada.
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2
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CRISPR-Cas9 editing of a TNPO3 mutation in a muscle cell model of limb-girdle muscular dystrophy type D2. MOLECULAR THERAPY. NUCLEIC ACIDS 2023; 31:324-338. [PMID: 36789274 PMCID: PMC9898580 DOI: 10.1016/j.omtn.2023.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 01/06/2023] [Indexed: 01/13/2023]
Abstract
A single-nucleotide deletion in the stop codon of the nuclear import receptor transportin-3 (TNPO3), also involved in human immunodeficiency virus type 1 (HIV-1) infection, causes the ultrarare autosomal dominant disease limb-girdle muscular dystrophy D2 (LGMDD2) by extending the wild-type protein. Here, we generated a patient-derived in vitro model of LGMDD2 as an immortalized myoblast cell line carrying the TNP O 3 mutation. The cell model reproduced critical molecular alterations seen in patients, such as TNP O 3 overexpression, defects in terminal muscle markers, and autophagy overactivation. Correction of the TNP O 3 mutation via CRISPR-Cas9 editing caused a significant reversion of the pathological phenotypes in edited cells, including a complete absence of the mutant TNPO3 protein, as detected with a polyclonal antibody specific against the abnormal 15-aa peptide. Transcriptomic analyses found that 15% of the transcriptome was differentially expressed in model myotubes. CRISPR-Cas9-corrected cells showed that 44% of the alterations were rescued toward normal levels. MicroRNAs (miRNAs) analyses showed that around 50% of miRNAs with impaired expression because of the disease were recovered on the mutation edition. In summary, this work provides proof of concept of the potential of CRISPR-Cas9-mediated gene editing of TNP O 3 as a therapeutic approach and describes critical reagents in LGMDD2 research.
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Wei XJ, Sun H, Miao J, Qiu RQ, Jiang ZZ, Ma ZW, Sun W, Yu XF. Clinical-pathological features and muscle imaging findings in 36 Chinese patients with rimmed vacuolar myopathies: case series study and review of literature. Front Neurol 2023; 14:1152738. [PMID: 37188302 PMCID: PMC10175607 DOI: 10.3389/fneur.2023.1152738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 04/03/2023] [Indexed: 05/17/2023] Open
Abstract
Introduction Rimmed vacuolar myopathies (RVMs) are a group of genetically heterogeneous diseases that share histopathological characteristics on muscle biopsy, including the aberrant accumulation of autophagic vacuoles. However, the presence of non-coding sequences and structural mutations, some of which remain undetectable, confound the identification of pathogenic mutations responsible for RVMs. Therefore, we assessed the clinical profiles and muscle magnetic resonance imaging (MRI) changes in 36 Chinese patients with RVMs, emphasizing the role of muscle MRI in disease identification and differential diagnosis to propose a comprehensive literature-based imaging pattern to facilitate improved diagnostic workup. Methods All patients presented with rimmed vacuoles with varying degrees of muscular dystrophic changes and underwent a comprehensive evaluation using clinical, morphological, muscle MRI and molecular genetic analysis. We assessed muscle changes in the Chinese RVMs and provided an overview of the RVMs, focusing on the patterns of muscle involvement on MRI. Results A total of 36 patients, including 24 with confirmed distal myopathy and 12 with limb-girdle phenotype, had autophagic vacuoles with RVMs. Hierarchical clustering of patients according to the predominant effect of the distal or proximal lower limbs revealed that most patients with RVMs could be distinguished. GNE myopathy was the most prevalent form of RVMs observed in this study. Moreover, MRI helped identify the causative genes in some diseases (e.g., desminopathy and hereditary myopathy with early respiratory failure) and confirmed the pathogenicity of a novel mutation (e.g., adult-onset proximal rimmed vacuolar titinopathy) detected using next-generation sequencing. Discussion Collectively, our findings expand our knowledge of the genetic spectrum of RVMs in China and suggest that muscle imaging should be an integral part of assisting genetic testing and avoiding misdiagnosis in the diagnostic workup of RVM.
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Diez-Fuertes F, López-Huertas MR, García-Pérez J, Calonge E, Bermejo M, Mateos E, Martí P, Muelas N, Vílchez JJ, Coiras M, Alcamí J, Rodríguez-Mora S. Transcriptomic Evidence of the Immune Response Activation in Individuals With Limb Girdle Muscular Dystrophy Dominant 2 (LGMDD2) Contributes to Resistance to HIV-1 Infection. Front Cell Dev Biol 2022; 10:839813. [PMID: 35646913 PMCID: PMC9136291 DOI: 10.3389/fcell.2022.839813] [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: 12/20/2021] [Accepted: 04/05/2022] [Indexed: 11/13/2022] Open
Abstract
LGMDD2 is a rare form of muscular dystrophy characterized by one of the three heterozygous deletions described within the TNPO3 gene that result in the addition of a 15-amino acid tail in the C-terminus.TNPO3 is involved in the nuclear import of splicing factors and acts as a host cofactor for HIV-1 infection by mechanisms not yet deciphered. Further characterization of the crosstalk between HIV-1 infection and LGMDD2 disease may contribute to a better understanding of both the cellular alterations occurring in LGMDD2 patients and the role of TNPO3 in the HIV-1 cycle. To this regard, transcriptome profiling of PBMCs from LGMDD2 patients carrying the deletion c.2771delA in the TNPO3 gene was compared to healthy controls. A total of 545 differentially expressed genes were detected between LGMDD2 patients and healthy controls, with a high representation of G protein-coupled receptor binding chemokines and metallopeptidases among the most upregulated genes in LGMDD2 patients. Plasma levels of IFN-β and IFN-γ were 4.7- and 2.7-fold higher in LGMDD2 patients, respectively. An increase of 2.3-fold in the expression of the interferon-stimulated gene MxA was observed in activated PBMCs from LGMDD2 patients after ex vivo HIV-1 pseudovirus infection. Thus, the analysis suggests a pro-inflammatory state in LGMDD2 patients also described for other muscular dystrophies, that is characterized by the alteration of IL-17 signaling pathway and the consequent increase of metallopeptidases activity and TNF response. In summary, the increase in interferons and inflammatory mediators suggests an antiviral environment and resistance to HIV-1 infection but that could also impair muscular function in LGMDD2 patients, worsening disease evolution. Biomarkers of disease progression and therapeutic strategies based on these genes and mechanisms should be further investigated for this type of muscular dystrophy.
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Affiliation(s)
- Francisco Diez-Fuertes
- AIDS Immunopathogenesis Unit, National Center of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
| | - María Rosa López-Huertas
- AIDS Immunopathogenesis Unit, National Center of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
| | - Javier García-Pérez
- AIDS Immunopathogenesis Unit, National Center of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
| | - Esther Calonge
- AIDS Immunopathogenesis Unit, National Center of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
| | - Mercedes Bermejo
- AIDS Immunopathogenesis Unit, National Center of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
| | - Elena Mateos
- AIDS Immunopathogenesis Unit, National Center of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
| | - Pilar Martí
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari i Politècnic La Fe, Valencia, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Valencia, Spain
| | - Nuria Muelas
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari i Politècnic La Fe, Valencia, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Valencia, Spain
| | - Juan Jesús Vílchez
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari i Politècnic La Fe, Valencia, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Valencia, Spain
| | - Mayte Coiras
- AIDS Immunopathogenesis Unit, National Center of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
| | - José Alcamí
- AIDS Immunopathogenesis Unit, National Center of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
- Infectious Diseases Unit, IDIBAPS, Hospital Clinic, University of Barcelona, Barcelona, Spain
- *Correspondence: José Alcamí, ; Sara Rodríguez-Mora,
| | - Sara Rodríguez-Mora
- AIDS Immunopathogenesis Unit, National Center of Microbiology, Instituto de Salud Carlos III, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
- *Correspondence: José Alcamí, ; Sara Rodríguez-Mora,
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5
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Costa R, Rodia MT, Pacilio S, Angelini C, Cenacchi G. LGMD D2 TNPO3-Related: From Clinical Spectrum to Pathogenetic Mechanism. Front Neurol 2022; 13:840683. [PMID: 35309568 PMCID: PMC8931187 DOI: 10.3389/fneur.2022.840683] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 01/31/2022] [Indexed: 11/13/2022] Open
Abstract
Limb-girdle muscular dystrophies (LGMDs) are clinically and genetically heterogeneous diseases presenting with a wide clinical spectrum. Autosomal dominant LGMDs represent about 10–15% of LGMDs and include disorders due to defects of DNAJB6, transportin-3 (TNPO3), HNRNPDL, Calpain-3 (CAPN3), and Bethlem myopathy. This review article aims to describe the clinical spectrum of LGMD D2 TNPO3-related, a rare disease due to heterozygous mutation in the TNPO3 gene. TNPO3 encodes for transportin-3, which belongs to the importin beta family and transports into the nucleus serine/arginine-rich (SR) proteins, such as splicing factors, and HIV-1 proteins, thus contributing to viral infection. The purpose of this review is to present and compare the clinical features and the genetic and histopathological findings described in LGMD D2, performing a comparative analytical description of all the families and sporadic cases identified. Even if the causative gene and mutations of this disease have been identified, the pathogenic mechanisms are still an open issue; therefore, we will present an overview of the hypotheses that explain the pathology of LGMD D2 TNPO3-related.
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Affiliation(s)
- Roberta Costa
- Department of Biomedical and Neuromotor Sciences–DIBINEM, Alma Mater Studiorum University of Bologna, Bologna, Italy
- Applied Biomedical Research Center–CRBA, IRCCS St. Orsola Hospital, Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Maria Teresa Rodia
- Department of Biomedical and Neuromotor Sciences–DIBINEM, Alma Mater Studiorum University of Bologna, Bologna, Italy
- Applied Biomedical Research Center–CRBA, IRCCS St. Orsola Hospital, Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Serafina Pacilio
- Department of Biomedical and Neuromotor Sciences–DIBINEM, Alma Mater Studiorum University of Bologna, Bologna, Italy
- Applied Biomedical Research Center–CRBA, IRCCS St. Orsola Hospital, Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Corrado Angelini
- Laboratory for Neuromuscular Diseases, Campus Pietro d'Abano, University of Padova, Padova, Italy
| | - Giovanna Cenacchi
- Department of Biomedical and Neuromotor Sciences–DIBINEM, Alma Mater Studiorum University of Bologna, Bologna, Italy
- Applied Biomedical Research Center–CRBA, IRCCS St. Orsola Hospital, Alma Mater Studiorum University of Bologna, Bologna, Italy
- *Correspondence: Giovanna Cenacchi
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Odeh HM, Fare CM, Shorter J. Nuclear-Import Receptors Counter Deleterious Phase Transitions in Neurodegenerative Disease. J Mol Biol 2022; 434:167220. [PMID: 34464655 PMCID: PMC8748273 DOI: 10.1016/j.jmb.2021.167220] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/20/2021] [Accepted: 08/24/2021] [Indexed: 01/17/2023]
Abstract
Nuclear-import receptors (NIRs) engage nuclear-localization signals (NLSs) of polypeptides in the cytoplasm and transport these cargo across the size-selective barrier of the nuclear-pore complex into the nucleoplasm. Beyond this canonical role in nuclear transport, NIRs operate in the cytoplasm to chaperone and disaggregate NLS-bearing clients. Indeed, NIRs can inhibit and reverse functional and deleterious phase transitions of their cargo, including several prominent neurodegenerative disease-linked RNA-binding proteins (RBPs) with prion-like domains (PrLDs), such as TDP-43, FUS, EWSR1, TAF15, hnRNPA1, and hnRNPA2. Importantly, elevated NIR expression can mitigate degenerative phenotypes connected to aberrant cytoplasmic aggregation of RBPs with PrLDs. Here, we review recent discoveries that NIRs can also antagonize aberrant interactions and toxicity of arginine-rich, dipeptide-repeat proteins that are associated with amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) caused by G4C2 hexanucleotide repeat expansions in the first intron of C9ORF72. We also highlight recent findings that multiple NIR family members can prevent and reverse liquid-liquid phase separation of specific clients bearing RGG motifs in an NLS-independent manner. Finally, we discuss strategies to enhance NIR activity or expression, which could have therapeutic utility for several neurodegenerative disorders, including ALS, FTD, multisystem proteinopathy, limbic-predominant age-related TDP-43 encephalopathy, tauopathies, and related diseases.
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Affiliation(s)
- Hana M Odeh
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Charlotte M Fare
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Biochemistry and Molecular Biophysics Graduate Group, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. https://twitter.com/CharlotteFare
| | - James Shorter
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Biochemistry and Molecular Biophysics Graduate Group, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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7
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Blázquez-Bernal Á, Fernandez-Costa JM, Bargiela A, Artero R. Inhibition of autophagy rescues muscle atrophy in a LGMDD2 Drosophila model. FASEB J 2021; 35:e21914. [PMID: 34547132 DOI: 10.1096/fj.202100539rr] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 08/23/2021] [Accepted: 08/25/2021] [Indexed: 01/18/2023]
Abstract
Limb-girdle muscular dystrophy D2 (LGMDD2) is an ultrarare autosomal dominant myopathy caused by mutation of the normal stop codon of the TNPO3 nuclear importin. The mutant protein carries a 15 amino acid C-terminal extension associated with pathogenicity. Here we report the first animal model of the disease by expressing the human mutant TNPO3 gene in Drosophila musculature or motor neurons and concomitantly silencing the endogenous expression of the fly protein ortholog. A similar genotype expressing wildtype TNPO3 served as a control. Phenotypes characterization revealed that mutant TNPO3 expression targeted at muscles or motor neurons caused LGMDD2-like phenotypes such as muscle degeneration and atrophy, and reduced locomotor ability. Notably, LGMDD2 mutation increase TNPO3 at the transcript and protein level in the Drosophila model Upregulated muscle autophagy observed in LGMDD2 patients was also confirmed in the fly model, in which the anti-autophagic drug chloroquine was able to rescue histologic and functional phenotypes. Overall, we provide a proof of concept of autophagy as a target to treat disease phenotypes and propose a neurogenic component to explain mutant TNPO3 pathogenicity in diseased muscles.
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Affiliation(s)
- Águeda Blázquez-Bernal
- Translational Genomics Group, University Institute for Biotechnology and Biomedicine (BIOTECMED), University of Valencia, Valencia, Spain.,Area of Metabolism and Organic Failure, Incliva Health Research Institute, Valencia, Spain.,Incliva-CIPF Joint Unit, Valencia, Spain
| | - Juan M Fernandez-Costa
- Translational Genomics Group, University Institute for Biotechnology and Biomedicine (BIOTECMED), University of Valencia, Valencia, Spain.,Area of Metabolism and Organic Failure, Incliva Health Research Institute, Valencia, Spain.,Incliva-CIPF Joint Unit, Valencia, Spain
| | - Ariadna Bargiela
- Translational Genomics Group, University Institute for Biotechnology and Biomedicine (BIOTECMED), University of Valencia, Valencia, Spain.,Area of Metabolism and Organic Failure, Incliva Health Research Institute, Valencia, Spain.,Incliva-CIPF Joint Unit, Valencia, Spain
| | - Ruben Artero
- Translational Genomics Group, University Institute for Biotechnology and Biomedicine (BIOTECMED), University of Valencia, Valencia, Spain.,Area of Metabolism and Organic Failure, Incliva Health Research Institute, Valencia, Spain.,Incliva-CIPF Joint Unit, Valencia, Spain
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8
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Costa R, Rodia MT, Zini N, Pegoraro V, Marozzo R, Capanni C, Angelini C, Lattanzi G, Santi S, Cenacchi G. Morphological study of TNPO3 and SRSF1 interaction during myogenesis by combining confocal, structured illumination and electron microscopy analysis. Mol Cell Biochem 2021; 476:1797-1811. [PMID: 33452620 PMCID: PMC7940345 DOI: 10.1007/s11010-020-04023-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 12/11/2020] [Indexed: 12/13/2022]
Abstract
Transportin3 (TNPO3) shuttles the SR proteins from the cytoplasm to the nucleus. The SR family includes essential splicing factors, such as SRSF1, that influence alternative splicing, controlling protein diversity in muscle and satellite cell differentiation. Given the importance of alternative splicing in the myogenic process and in the maintenance of healthy muscle, alterations in the splicing mechanism might contribute to the development of muscle disorders. Combining confocal, structured illumination and electron microscopy, we investigated the expression of TNPO3 and SRSF1 during myogenesis, looking at nuclear and cytoplasmic compartments. We investigated TNPO3 and its interaction with SRSF1 and we observed that SRSF1 remained mainly localized in the nucleus, while TNPO3 decreased in the cytoplasm and was strongly clustered in the nuclei of differentiated myotubes. In conclusion, combining different imaging techniques led us to describe the behavior of TNPO3 and SRSF1 during myogenesis, showing that their dynamics follow the myogenic process and could influence the proteomic network necessary during myogenesis. The combination of different high-, super- and ultra-resolution imaging techniques led us to describe the behavior of TNPO3 and its interaction with SRSF1, looking at nuclear and cytoplasmic compartments. These observations represent a first step in understanding the role of TNPO3 and SRFSF1 in complex mechanisms, such as myogenesis.
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Affiliation(s)
- Roberta Costa
- Department of Biomedical and Neuromotor Sciences-DIBINEM, Alma Mater Studiorum University of Bologna, via Massarenti 9, 40138, Bologna, Italy.,Center of Applied Biomedical Research-CRBA, Alma Mater Studiorum University of Bologna, St. Orsola Hospital, via Massarenti 9, 40138, Bologna, Italy
| | - Maria Teresa Rodia
- Department of Biomedical and Neuromotor Sciences-DIBINEM, Alma Mater Studiorum University of Bologna, via Massarenti 9, 40138, Bologna, Italy.,Center of Applied Biomedical Research-CRBA, Alma Mater Studiorum University of Bologna, St. Orsola Hospital, via Massarenti 9, 40138, Bologna, Italy
| | - Nicoletta Zini
- CNR-National Research Council of Italy, Institute of Molecular Genetics "Luigi Luca Cavalli-Sforza", Unit of Bologna, via di Barbiano 1/10, 40136, Bologna, Italy.,IRCCS Istituto Ortopedico Rizzoli, via di Barbiano 1/10, 40136, Bologna, Italy
| | - Valentina Pegoraro
- Neuromuscular Unit, Neurobiology Research group, IRCCS San Camillo Hospital, via Alberoni 70, 30126, Venice, Italy
| | - Roberta Marozzo
- Neuromuscular Unit, Neurobiology Research group, IRCCS San Camillo Hospital, via Alberoni 70, 30126, Venice, Italy
| | - Cristina Capanni
- CNR-National Research Council of Italy, Institute of Molecular Genetics "Luigi Luca Cavalli-Sforza", Unit of Bologna, via di Barbiano 1/10, 40136, Bologna, Italy.,IRCCS Istituto Ortopedico Rizzoli, via di Barbiano 1/10, 40136, Bologna, Italy
| | - Corrado Angelini
- Neuromuscular Unit, Neurobiology Research group, IRCCS San Camillo Hospital, via Alberoni 70, 30126, Venice, Italy
| | - Giovanna Lattanzi
- CNR-National Research Council of Italy, Institute of Molecular Genetics "Luigi Luca Cavalli-Sforza", Unit of Bologna, via di Barbiano 1/10, 40136, Bologna, Italy.,IRCCS Istituto Ortopedico Rizzoli, via di Barbiano 1/10, 40136, Bologna, Italy
| | - Spartaco Santi
- CNR-National Research Council of Italy, Institute of Molecular Genetics "Luigi Luca Cavalli-Sforza", Unit of Bologna, via di Barbiano 1/10, 40136, Bologna, Italy.,IRCCS Istituto Ortopedico Rizzoli, via di Barbiano 1/10, 40136, Bologna, Italy
| | - Giovanna Cenacchi
- Department of Biomedical and Neuromotor Sciences-DIBINEM, Alma Mater Studiorum University of Bologna, via Massarenti 9, 40138, Bologna, Italy. .,Center of Applied Biomedical Research-CRBA, Alma Mater Studiorum University of Bologna, St. Orsola Hospital, via Massarenti 9, 40138, Bologna, Italy.
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Li L, Jing Z, Cheng L, Liu W, Wang H, Xu Y, Zheng X, Yu X, Liu S. Compound heterozygous DYSF variants causing limb-girdle muscular dystrophy type 2B in a Chinese family. J Gene Med 2020; 22:e3272. [PMID: 32889728 DOI: 10.1002/jgm.3272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 08/22/2020] [Accepted: 08/29/2020] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND The dysferlin gene or the DYSF gene encodes the Ca2+ -dependent phospholipid-binding protein dysferlin, which belongs to the ferlin family and is associated with muscle membrane regeneration and repair. Variants in the DYSF gene are responsible for limb-girdle muscular dystrophy type 2B (LGMD2B), also called limb-girdle muscular dystrophy recessive 2 (LGMDR2), a rare subtype of muscular dystrophy involving progressive muscle weakness and atrophy. The present study aimed to identify the variants responsible for the clinical symptoms of a Chinese patient with limb girdle muscular dystrophies (LGMDs) and to explore the genotype-phenotype associations of LGMD2B. METHODS A series of clinical examinations, including blood tests, magnetic resonance imaging scans for the lower legs, electromyography and muscle biopsy, was performed on the proband diagnosed with muscular dystrophies. Whole exome sequencing was conducted to detect the causative variants, followed by Sanger sequencing to validate these variants. RESULTS We identified two compound heterozygous variants in the DYSF gene, c.1058 T>C, p.(Leu353Pro) in exon 12 and c.1461C>A/p.Cys487* in exon 16 in this proband, which were inherited from the father and mother, respectively. In silico analysis for these variants revealed deleterious results by PolyPhen-2 (Polymorphism Phenotyping v2; http://genetics.bwh.harvard.edu/pph2), SIFT (Sorting Intolerant From Tolerant; https://sift.bii.a-star.edu.sg), PROVEAN (Protein Variation Effect Analyzer; http://provean.jcvi.org/seq_submit.php) and MutationTaster (http://www.mutationtaster.org). In addition, the two compound heterozygous variants in the proband were absent in 100 control individuals who had an identical ethnic origin and were from the same region, suggesting that these variants may be the pathogenic variants responsible for the LGMD2B phenotypes for this proband. CONCLUSIONS The present study broadens our understanding of the mutational spectrum of the DYSF gene, which provides a deep insight into the pathogenesis of LGMDs and accelerates the development of a prenatal diagnosis.
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Affiliation(s)
- Liangshan Li
- Medical Genetic Department, The Affiliated Hospital of Qingdao University, Qingdao, China.,Department of Clinical Laboratory, Medical College of Qingdao University, Qingdao, China
| | - Zhongcui Jing
- Department of Blood Transfusion, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Lei Cheng
- Department of Neurosurgery, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Wenmiao Liu
- Medical Genetic Department, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Haiyan Wang
- Department of Blood Transfusion, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Yinglei Xu
- Medical Genetic Department, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Xueping Zheng
- Department of Neurology, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Xiaoling Yu
- Department of Pathophysiology, Medical College of Qingdao University, Qingdao, China
| | - Shiguo Liu
- Medical Genetic Department, The Affiliated Hospital of Qingdao University, Qingdao, China
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10
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Transportin 3 (TNPO3) and related proteins in limb girdle muscular dystrophy D2 muscle biopsies: A morphological study and pathogenetic hypothesis. Neuromuscul Disord 2020; 30:685-692. [PMID: 32690349 DOI: 10.1016/j.nmd.2020.05.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 05/05/2020] [Accepted: 05/18/2020] [Indexed: 11/22/2022]
Abstract
LGMD D2 is a disease caused by TNPO3 mutation. We describe the expression of TNPO3 and selected proteins, likely modified by TNPO3 mutation, in muscle biopsies of affected patients. We also aim to find other genes involved in pathways correlated to TNPO3. Our morphological study on LGMD D2 muscle described the expression of TNPO3 and SRSF1, a splicing factor transported by TNPO3. Moreover, we investigated some sarcomeric and nuclear proteins, likely altered by TNPO3 mutation. Through an in silico approach we tried to identify genes involved in pathways that include, besides TNPO3 and SRSF1, p62 and Murf-1, altered in LGMD D2. In patients' muscles TNPO3 appeared weaker and randomly organized, with sporadic cytoplasmic aggregates positive for TNPO3; both SRSF1 and sarcomeric alpha actinin showed a different expression, while there were no alterations in the expression of the nuclear proteins. The in silico study lead to identify five genes, all coding for proteins responsible for muscle contraction. Our data suggest a possible interference in the morphology and function of myofibrillar network by mutated TNPO3; these findings are supported by the in silico identification of genes involved in muscle contraction that could help to explain the pathogenic mechanisms of LGMD D2.
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Allamand V. Génétique : Une mutation du gène TNPO3 impliquée dans la LGMD D2 confère une protection à l’infection par le VIH-1. Med Sci (Paris) 2019; 35 Hors série n° 2:45-46. [DOI: 10.1051/medsci/2019240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Huang Y, Deng Y, Shang L, Yang L, Huang J, Ma J, Liao X, Zhou H, Xian J, Liang G, Huang Q. Effect of type 2 diabetes mellitus caveolin-3 K15N mutation on glycometabolism. Exp Ther Med 2019; 18:2531-2539. [PMID: 31572504 PMCID: PMC6755474 DOI: 10.3892/etm.2019.7840] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 05/23/2019] [Indexed: 01/08/2023] Open
Abstract
Caveolin-3 (CAV3) is a muscle-specific protein present within the muscle cell membrane that affects signaling pathways, including the insulin signaling pathway. A previous assessment of patients with newly developed type 2 diabetes (T2DM) demonstrated that CAV3 gene mutations may lead to changes in protein secondary structure. A severe CAV3 P104L mutation has previously been indicated to influence the phosphorylation of skeletal muscle cells and result in impaired glucose metabolism. In the present study, the effect of CAV3 K15N gene transfection in C2C12 cells was assessed. Transfection with K15N reduced the expression of total CAV3 and AKT2 proteins in the cells, and the translocation of glucose transporter type 4 to the muscle cell membrane, which resulted in decreased glucose uptake and glycogen synthesis in myocytes. In conclusion, these results indicate that the CAV3 K15N mutation may cause insulin-stimulated impaired glucose metabolism in myocytes, which may contribute to the development of T2DM.
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Affiliation(s)
- Yiyuan Huang
- School of Nursing, Youjiang Medical University for Nationalities, Baise, Guangxi 533000, P.R. China
| | - Yufeng Deng
- School of Nursing, Youjiang Medical University for Nationalities, Baise, Guangxi 533000, P.R. China
| | - Lina Shang
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Lihui Yang
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Juanjuan Huang
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Jing Ma
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Xianshan Liao
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Hui Zhou
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Jing Xian
- Department of Endocrinology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Guining Liang
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
| | - Qin Huang
- Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
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