101
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Guillín-Amarelle C, Fernández-Pombo A, Sánchez-Iglesias S, Araújo-Vilar D. Lipodystrophic laminopathies: Diagnostic clues. Nucleus 2018; 9:249-260. [PMID: 29557732 PMCID: PMC5973260 DOI: 10.1080/19491034.2018.1454167] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 11/02/2017] [Accepted: 03/15/2018] [Indexed: 01/19/2023] Open
Abstract
The nuclear lamina is a complex reticular structure that covers the inner face of the nucleus membrane in metazoan cells. It is mainly formed by intermediate filaments called lamins, and exerts essential functions to maintain the cellular viability. Lamin A/C provides mechanical steadiness to the nucleus and regulates genetic machinery. Laminopathies are tissue-specific or systemic disorders caused by variants in LMNA gene (primary laminopathies) or in other genes encoding proteins which are playing some role in prelamin A maturation or in lamin A/C function (secondary laminopathies). Those disorders in which adipose tissue is affected are called laminopathic lipodystrophies and include type 2 familial partial lipodystrophy and certain premature aging syndromes. This work summarizes the main clinical features of these syndromes, their associated comorbidities and the clues for the differential diagnosis with other lipodystrophic disorders.
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Affiliation(s)
- Cristina Guillín-Amarelle
- UETeM-Molecular Pathology Group, Department of Medicine, IDIS-CIMUS, University of Santiago de Compostela, Spain
| | - Antía Fernández-Pombo
- UETeM-Molecular Pathology Group, Department of Medicine, IDIS-CIMUS, University of Santiago de Compostela, Spain
| | - Sofía Sánchez-Iglesias
- UETeM-Molecular Pathology Group, Department of Medicine, IDIS-CIMUS, University of Santiago de Compostela, Spain
| | - David Araújo-Vilar
- UETeM-Molecular Pathology Group, Department of Medicine, IDIS-CIMUS, University of Santiago de Compostela, Spain
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102
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Dhawan PS, Liewluck T, Knapik J, Milone M. Myofibrillar myopathy due to dominant LMNA mutations: A report of 2 cases. Muscle Nerve 2017; 57:E124-E126. [PMID: 29211919 DOI: 10.1002/mus.26036] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 11/27/2017] [Accepted: 12/05/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Priya S Dhawan
- Department of Neurology, Mayo Clinic, Rochester, Minnesota, USA
| | - Teerin Liewluck
- Department of Neurology, Mayo Clinic, Rochester, Minnesota, USA
| | - Joseph Knapik
- Department of Neurology and Rehabilitation, Saint Mary's Regional Medical Center, Enid, Oklahoma, USA
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103
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Abstract
The nuclear lamina is a proteinaceous meshwork situated underneath the inner nuclear membrane and is composed of nuclear lamin proteins, which are type-V intermediate filaments. The LMNA gene gives rise to lamin A and lamin C through alternative splicing. Mutations in LMNA cause multiple diseases known as laminopathies, including Hutchinson-Gilford Progeria Syndrome (HGPS), a premature aging disorder caused by a point mutation that activates a cryptic 5' splice site in exon 11, resulting in a 150 bp deletion in the LMNA mRNA and the production of the dominant lamin A isoform progerin. During RNA sequencing analysis of wild type and HGPS patient skin fibroblasts, we discovered two novel LMNA isoforms. LMNAΔ447 and LMNAΔ297 use an alternative 3' splice acceptor site in the 3' untranslated region, and either the HGPS cryptic 5' splice site in exon 11 or the wild type 5' splice site. Both isoforms are present at low levels in HGPS patient and wild type cells in multiple cell types. We validate and quantify the expression levels of these novel isoforms in HGPS and wild type fibroblasts. Overexpression of either LMNAΔ447 or LMNAΔ297 is not sufficient to induce the typical HGPS cellular disease phenotypes and no significant difference in the two isoforms were found between young and old fibroblasts. These results identify and characterize two novel RNA isoforms of LMNA produced through alternative splicing.
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Affiliation(s)
- Emily DeBoy
- a National Cancer Institute, National Institutes of Health , Bethesda , MD , USA.,b Department of Cell Biology and Molecular Genetics , University of Maryland , College Park , MD , USA
| | - Madaiah Puttaraju
- a National Cancer Institute, National Institutes of Health , Bethesda , MD , USA
| | - Parthav Jailwala
- c CCR Collaborative Bioinformatics Core, National Cancer Institute, National Institutes of Health , Bethesda , MD , USA
| | - Manjula Kasoji
- c CCR Collaborative Bioinformatics Core, National Cancer Institute, National Institutes of Health , Bethesda , MD , USA
| | - Maggie Cam
- c CCR Collaborative Bioinformatics Core, National Cancer Institute, National Institutes of Health , Bethesda , MD , USA
| | - Tom Misteli
- a National Cancer Institute, National Institutes of Health , Bethesda , MD , USA
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104
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Janin A, Bauer D, Ratti F, Millat G, Méjat A. Nuclear envelopathies: a complex LINC between nuclear envelope and pathology. Orphanet J Rare Dis 2017; 12:147. [PMID: 28854936 PMCID: PMC5577761 DOI: 10.1186/s13023-017-0698-x] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 08/22/2017] [Indexed: 12/11/2022] Open
Abstract
Since the identification of the first disease causing mutation in the gene coding for emerin, a transmembrane protein of the inner nuclear membrane, hundreds of mutations and variants have been found in genes encoding for nuclear envelope components. These proteins can be part of the inner nuclear membrane (INM), such as emerin or SUN proteins, outer nuclear membrane (ONM), such as Nesprins, or the nuclear lamina, such as lamins A and C. However, they physically interact with each other to insure the nuclear envelope integrity and mediate the interactions of the nuclear envelope with both the genome, on the inner side, and the cytoskeleton, on the outer side. The core of this complex, called LINC (LInker of Nucleoskeleton to Cytoskeleton) is composed of KASH and SUN homology domain proteins. SUN proteins are INM proteins which interact with lamins by their N-terminal domain and with the KASH domain of nesprins located in the ONM by their C-terminal domain.Although most of these proteins are ubiquitously expressed, their mutations have been associated with a large number of clinically unrelated pathologies affecting specific tissues. Moreover, variants in SUN proteins have been found to modulate the severity of diseases induced by mutations in other LINC components or interactors. For these reasons, the diagnosis and the identification of the molecular explanation of "nuclear envelopathies" is currently challenging.The aim of this review is to summarize the human diseases caused by mutations in genes coding for INM proteins, nuclear lamina, and ONM proteins, and to discuss their potential physiopathological mechanisms that could explain the large spectrum of observed symptoms.
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Affiliation(s)
- Alexandre Janin
- University Lyon, Université Claude Bernard Lyon 1, Institut NeuroMyoGène, F-69622, Villeurbanne, France.,CNRS UMR 5310, F-69622, Villeurbanne, France.,INSERM U1217, F-69622, Villeurbanne, France.,Laboratoire de Cardiogénétique Moléculaire, Centre de Biologie et Pathologie Est, Hospices Civils de Lyon, Lyon, France
| | - Delphine Bauer
- University Lyon, Université Claude Bernard Lyon 1, Institut NeuroMyoGène, F-69622, Villeurbanne, France.,CNRS UMR 5310, F-69622, Villeurbanne, France.,INSERM U1217, F-69622, Villeurbanne, France
| | - Francesca Ratti
- University Lyon, Université Claude Bernard Lyon 1, Institut NeuroMyoGène, F-69622, Villeurbanne, France.,CNRS UMR 5310, F-69622, Villeurbanne, France.,INSERM U1217, F-69622, Villeurbanne, France
| | - Gilles Millat
- University Lyon, Université Claude Bernard Lyon 1, Institut NeuroMyoGène, F-69622, Villeurbanne, France.,CNRS UMR 5310, F-69622, Villeurbanne, France.,INSERM U1217, F-69622, Villeurbanne, France.,Laboratoire de Cardiogénétique Moléculaire, Centre de Biologie et Pathologie Est, Hospices Civils de Lyon, Lyon, France
| | - Alexandre Méjat
- University Lyon, Université Claude Bernard Lyon 1, Institut NeuroMyoGène, F-69622, Villeurbanne, France. .,CNRS UMR 5310, F-69622, Villeurbanne, France. .,INSERM U1217, F-69622, Villeurbanne, France. .,Nuclear Architecture Team, Institut NeuroMyoGène, CNRS UMR 5310 - INSERM U1217 - Université de Lyon - Université Claude Bernard Lyon 1, Lyon, France. .,Groupement Hospitalier Est - Centre de Biologie Est - Laboratoire de Cardiogénétique, 59 Boulevard Pinel, 69677, Bron, France.
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105
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Patni N, Xing C, Agarwal AK, Garg A. Juvenile-onset generalized lipodystrophy due to a novel heterozygous missense LMNA mutation affecting lamin C. Am J Med Genet A 2017; 173:2517-2521. [PMID: 28686329 DOI: 10.1002/ajmg.a.38341] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 05/30/2017] [Accepted: 06/06/2017] [Indexed: 11/06/2022]
Abstract
The LMNA gene contains 12 exons and encodes lamins A and C by alternative splicing within exon 10. While mutations in lamin A specific residues cause several diseases including lipodystrophy, progeria, muscular dystrophy, neuropathy, and cardiomyopathy, only three families with mutations in lamin C-specific residues are reported with cardiomyopathy, neuropathy, and muscular dystrophy so far. We now report two brothers with juvenile-onset generalized lipodystrophy due to a lamin C-specific mutation. The proband, a 23-year-old Caucasian male was reported to have generalized lipodystrophy at 3 weeks of age, developed diabetes, hypertriglyceridemia, hypertension and liver problems and died with complications of cirrhosis, and kidney failure. His younger brother, a 37-year-old Caucasian male developed generalized lipodystrophy around 2 years of age and was diagnosed with diabetes, hypertriglyceridemia, fatty liver, and hypertension at 36 years of age. Their father also died of end stage renal disease at age 52 years. Exome sequencing of the proband revealed an extremely rare missense heterozygous variant c.1711_1712CG>TC; p.(Arg571Ser) in LMNA which was confirmed by Sanger sequencing in both the patients. Interestingly, the mutation had no effect on mRNA splicing or relative expression of lamin A or C mRNA and protein in the lymphoblasts. Our observations suggest that mutant lamin C disrupts its interaction with other cellular proteins resulting in generalized lipodystrophy due to defective development and maintenance of adipose tissue.
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Affiliation(s)
- Nivedita Patni
- Division of Pediatric Endocrinology, Department of Pediatrics, Center for Human Nutrition, UT Southwestern Medical Center, Dallas, Texas
| | - Chao Xing
- McDermott Center for Human Growth and Development and Departments of Bioinformatics and Clinical Sciences, UT Southwestern Medical Center, Dallas, Texas
| | - Anil K Agarwal
- Division of Nutrition and Metabolic Diseases, Department of Internal Medicine and the Center for Human Nutrition, UT Southwestern Medical Center, Dallas, Texas
| | - Abhimanyu Garg
- Division of Nutrition and Metabolic Diseases, Department of Internal Medicine and the Center for Human Nutrition, UT Southwestern Medical Center, Dallas, Texas
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Ito K, Patel PN, Gorham JM, McDonough B, DePalma SR, Adler EE, Lam L, MacRae CA, Mohiuddin SM, Fatkin D, Seidman CE, Seidman JG. Identification of pathogenic gene mutations in LMNA and MYBPC3 that alter RNA splicing. Proc Natl Acad Sci U S A 2017; 114:7689-94. [PMID: 28679633 DOI: 10.1073/pnas.1707741114] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Genetic variants that cause haploinsufficiency account for many autosomal dominant (AD) disorders. Gene-based diagnosis classifies variants that alter canonical splice signals as pathogenic, but due to imperfect understanding of RNA splice signals other variants that may create or eliminate splice sites are often clinically classified as variants of unknown significance (VUS). To improve recognition of pathogenic splice-altering variants in AD disorders, we used computational tools to prioritize VUS and developed a cell-based minigene splicing assay to confirm aberrant splicing. Using this two-step procedure we evaluated all rare variants in two AD cardiomyopathy genes, lamin A/C (LMNA) and myosin binding protein C (MYBPC3). We demonstrate that 13 LMNA and 35 MYBPC3 variants identified in cardiomyopathy patients alter RNA splicing, representing a 50% increase in the numbers of established damaging splice variants in these genes. Over half of these variants are annotated as VUS by clinical diagnostic laboratories. Familial analyses of one variant, a synonymous LMNA VUS, demonstrated segregation with cardiomyopathy affection status and altered cardiac LMNA splicing. Application of this strategy should improve diagnostic accuracy and variant classification in other haploinsufficient AD disorders.
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107
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Akinci B, Onay H, Demir T, Savas-Erdeve Ş, Gen R, Simsir IY, Keskin FE, Erturk MS, Uzum AK, Yaylali GF, Ozdemir NK, Atik T, Ozen S, Yurekli BS, Apaydin T, Altay C, Akinci G, Demir L, Comlekci A, Secil M, Oral EA. Clinical presentations, metabolic abnormalities and end-organ complications in patients with familial partial lipodystrophy. Metabolism 2017; 72:109-119. [PMID: 28641778 DOI: 10.1016/j.metabol.2017.04.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 04/18/2017] [Accepted: 04/23/2017] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Familial partial lipodystrophy (FPLD) is a rare genetic disorder characterized by partial lack of subcutaneous fat. METHODS This multicenter prospective observational study included data from 56 subjects with FPLD (18 independent Turkish families). Thirty healthy controls were enrolled for comparison. RESULTS Pathogenic variants of the LMNA gene were determined in nine families. Of those, typical exon 8 codon 482 pathogenic variants were identified in four families. Analysis of the LMNA gene also revealed exon 1 codon 47, exon 5 codon 306, exon 6 codon 349, exon 9 codon 528, and exon 11 codon 582 pathogenic variants. Analysis of the PPARG gene revealed exon 3 p.Y151C pathogenic variant in two families and exon 7 p.H477L pathogenic variant in one family. A non-pathogenic exon 5 p.R215Q variant of the LMNB2 gene was detected in another family. Five other families harbored no mutation in any of the genes sequenced. MRI studies showed slightly different fat distribution patterns among subjects with different point mutations, though it was strikingly different in subjects with LMNA p.R349W pathogenic variant. Subjects with pathogenic variants of the PPARG gene were associated with less prominent fat loss and relatively higher levels of leptin compared to those with pathogenic variants in the LMNA gene. Various metabolic abnormalities associated with insulin resistance were detected in all subjects. End-organ complications were observed. CONCLUSION We have identified various pathogenic variants scattered throughout the LMNA and PPARG genes in Turkish patients with FPLD. Phenotypic heterogeneity is remarkable in patients with LMNA pathogenic variants related to the site of missense mutations. FPLD, caused by pathogenic variants either in LMNA or PPARG is associated with metabolic abnormalities associated with insulin resistance that lead to increased morbidity.
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Affiliation(s)
- Baris Akinci
- Division of Endocrinology, Dokuz Eylul University, Izmir, Turkey.
| | - Huseyin Onay
- Department of Medical Genetics, Ege University, Izmir, Turkey
| | - Tevfik Demir
- Division of Endocrinology, Dokuz Eylul University, Izmir, Turkey
| | - Şenay Savas-Erdeve
- Division of Pediatric Endocrinology, Dr. Sami Ulus Obstetrics and Gynecology, Children's Health and Disease Training and Research Hospital, Ankara, Turkey
| | - Ramazan Gen
- Division of Endocrinology, Mersin University, Mersin, Turkey
| | | | - Fatma Ela Keskin
- Division of Endocrinology, Cerrahpasa Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | | | - Ayse Kubat Uzum
- Division of Endocrinology, Capa Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | | | | | - Tahir Atik
- Division of Pediatric Genetics, Ege University, Izmir, Turkey
| | - Samim Ozen
- Division of Pediatric Endocrinology, Ege University, Izmir, Turkey
| | | | - Tugce Apaydin
- Division of Endocrinology, Cerrahpasa Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Canan Altay
- Department of Radiology, Dokuz Eylul University, Izmir, Turkey
| | - Gulcin Akinci
- Division of Pediatric Neurology, Dr.Behcet Uz Children's Hospital, Izmir, Turkey
| | - Leyla Demir
- Department of Biochemistry, Ataturk Training Hospital, Izmir, Turkey
| | | | - Mustafa Secil
- Department of Radiology, Dokuz Eylul University, Izmir, Turkey
| | - Elif Arioglu Oral
- Division of Endocrinology and Metabolism, Brehm Center for Diabetes Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
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Sframeli M, Sarkozy A, Bertoli M, Astrea G, Hudson J, Scoto M, Mein R, Yau M, Phadke R, Feng L, Sewry C, Fen ANS, Longman C, McCullagh G, Straub V, Robb S, Manzur A, Bushby K, Muntoni F. Congenital muscular dystrophies in the UK population: Clinical and molecular spectrum of a large cohort diagnosed over a 12-year period. Neuromuscul Disord 2017; 27:793-803. [PMID: 28688748 DOI: 10.1016/j.nmd.2017.06.008] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 06/09/2017] [Accepted: 06/15/2017] [Indexed: 12/27/2022]
Abstract
Congenital muscular dystrophies (CMDs) are clinically and genetically heterogeneous conditions; some fatal in the first few years of life and with central nervous system involvement, whereas others present a milder course. We provide a comprehensive report of the relative frequency and clinical and genetic spectrum of CMD in the UK. Genetic analysis of CMD genes in the UK is centralised in London and Newcastle. Between 2001 and 2013, a genetically confirmed diagnosis of CMD was obtained for 249 unrelated individuals referred to these services. The most common CMD subtype was laminin-α2 related CMD (also known as MDC1A, 37.4%), followed by dystroglycanopathies (26.5%), Ullrich-CMD (15.7%), SEPN1 (11.65%) and LMNA (8.8%) gene related CMDs. The most common dystroglycanopathy phenotype was muscle-eye-brain-like disease. Fifteen patients carried mutations in the recently discovered ISPD, GMPPB and B3GALNT2 genes. Pathogenic allelic mutations in one of the CMD genes were also found in 169 unrelated patients with milder phenotypes, such as limb girdle muscular dystrophy and Bethlem myopathy. In all, we identified 362 mutations, 160 of which were novel. Our results provide one of the most comprehensive reports on genetics and clinical features of CMD subtypes and should help diagnosis and counselling of families with this group of conditions.
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Affiliation(s)
- Maria Sframeli
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK; Department of Clinical and Experimental Medicine and Nemo Sud Clinical Centre, University of Messina, Messina, Italy
| | - Anna Sarkozy
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK
| | - Marta Bertoli
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, University of Newcastle, Central Parkway, Newcastle upon Tyne, UK
| | - Guja Astrea
- Department of Developmental Neuroscience, IRCCS Fondazione Stella Maris, Pisa, Italy
| | - Judith Hudson
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, University of Newcastle, Central Parkway, Newcastle upon Tyne, UK
| | - Mariacristina Scoto
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK
| | | | | | - Rahul Phadke
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK
| | - Lucy Feng
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK
| | - Caroline Sewry
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK
| | - Adeline Ngoh Seow Fen
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK
| | - Cheryl Longman
- West of Scotland Regional Genetics Service, Southern General Hospital, Glasgow, UK
| | | | - Volker Straub
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, University of Newcastle, Central Parkway, Newcastle upon Tyne, UK
| | - Stephanie Robb
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK
| | - Adnan Manzur
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK
| | - Kate Bushby
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, University of Newcastle, Central Parkway, Newcastle upon Tyne, UK
| | - Francesco Muntoni
- Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health & Great Ormond Street Hospital, London, UK.
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109
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Ambonville C, Bouldouyre MA, Laforêt P, Richard P, Benveniste O, Vigouroux C. [A complex case of diabetes due to LMNA mutation]. Rev Med Interne 2017; 38:695-699. [PMID: 28545855 DOI: 10.1016/j.revmed.2017.04.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 04/07/2017] [Accepted: 04/20/2017] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Laminopathies (diseases related to A/C mutations of lamines) are rare genetic diseases with an extensive phenotypic spectrum, including lipodystrophic syndromes-characterized by a selective loss of adipose tissue-of which the partial Dunnigan family type is the most frequent. CASE REPORT We report on a 55-year-old woman with diabetes and long-term disabling myalgia. Her cushingoid morphotype, associated with cutaneous lipo-atrophy and muscle hypertrophy in addition to a genetic heritage, led us to the diagnosis of complex partial familial lipodystrophy heterozygous LMNA_c.82C>T, p.Arg28Trp mutation. CONCLUSION Familial partial lipodystrophic syndromes may have varied phenotypes, mainly cardio-metabolic, which could mimic a particularly severe type 2 diabetes. The diagnostic work-up of this disease has to include a careful investigation of gait troubles and paroxysmal conduction that could lead to sudden death, as well as a genetic examination. In some cases, recombinant leptin can be proposed.
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Affiliation(s)
- C Ambonville
- Service d'endocrinologie, diabétologie et maladies métaboliques, centre hospitalier intercommunal Robert-Ballanger, 93603 Aulnay-sous-Bois, France
| | - M-A Bouldouyre
- Service de médecine interne et maladies infectieuses, centre hospitalier intercommunal Robert-Ballanger, 93603 Aulnay-sous-Bois, France.
| | - P Laforêt
- Centre de référence pathologie neuromusculaire Paris Est, groupe hospitalier Pitié-Salpétrière, AH-HP, 43-87, boulevard de l'Hôpital, 75013 Paris, France
| | - P Richard
- Unité fonctionnelle de cardiogénétique et myogénétique moléculaire et cellulaire, service de biochimie métabolique, hôpitaux universitaires Pitié-Salpétrière Charles-Foix, AP-HP, 43-87, boulevard de l'Hôpital, 75013 Paris, France
| | - O Benveniste
- Département de médecine interne et immunologie clinique, centre de référence des maladies rares, pathologies du muscle inflammatoire, groupe hospitalier Pitié-Salpétrière, AP-HP, 43-87, boulevard de l'Hôpital, 75013 Paris, France
| | - C Vigouroux
- Service d'endocrinologie et laboratoire commun de biologie et génétique moléculaires, hôpital Saint-Antoine, AP-HP, 75012 Paris, France; Inserm UMR_S938, centre de recherche Saint-Antoine (CRSA), ICAN, institut de cardio-métabolisme et nutrition, Sorbonne universités, UPMC université Paris 6, 75012 Paris, France
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110
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Abstract
The nuclear lamina is a critical structural domain for the maintenance of genomic stability and whole-cell mechanics. Mutations in the LMNA gene, which encodes nuclear A-type lamins lead to the disruption of these key cellular functions, resulting in a number of devastating diseases known as laminopathies. Cardiomyopathy is a common laminopathy and is highly penetrant with poor prognosis. To date, cell mechanical instability and dysregulation of gene expression have been proposed as the main mechanisms driving cardiac dysfunction, and indeed discoveries in these areas have provided some promising leads in terms of therapeutics. However, important questions remain unanswered regarding the role of lamin A dysfunction in the heart, including a potential role for the toxicity of lamin A precursors in LMNA cardiomyopathy, which has yet to be rigorously investigated.
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Affiliation(s)
- Daniel Brayson
- a King's College London, The James Black Centre , London , United Kingdom
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111
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Cheng DD, Li J, Li SJ, Yang QC, Fan CY. CNOT1 cooperates with LMNA to aggravate osteosarcoma tumorigenesis through the Hedgehog signaling pathway. Mol Oncol 2017; 11:388-404. [PMID: 28188704 PMCID: PMC5527480 DOI: 10.1002/1878-0261.12043] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 01/22/2017] [Accepted: 02/02/2017] [Indexed: 01/16/2023] Open
Abstract
While treatments for childhood osteosarcoma have improved, the overall survival for this common type of bone cancer has not changed for three decades, and thus, new targets for therapeutic development are needed. To identify tumor-related proteins in osteosarcoma, we used isobaric tags in a relative and absolute quantitation proteomic approach to analyze the differentially expressed proteins between osteosarcoma cells and human osteoblastic cells. Through clinical screening and functional evaluation, CCR4-NOT transcription complex subunit 1 (CNOT1) correlated with the growth of osteosarcoma cells. To date, the mechanisms and regulatory roles of CNOT1 in tumors, including osteosarcoma, remain largely elusive. Here, we present evidence that knockdown of CNOT1 inhibits the growth of osteosarcoma in vitro and in vivo. Mechanistically, we observed that CNOT1 interacted with LMNA (lamin A) and functioned as a positive regulator of this intermediate filament protein. The RNA-seq analysis revealed that CNOT1 depletion inhibited the Hedgehog signaling pathway in osteosarcoma cells. A rescue study showed that the decreased growth of osteosarcoma cells and inhibition of the Hedgehog signaling pathway by CNOT1 depletion were reversed by LMNA overexpression, indicating that the activity of CNOT1 was LMNA dependent. Notably, the CNOT1 expression was significantly associated with tumor recurrence, Enneking stage, and poor survival in patients with osteosarcoma. Examination of clinical samples confirmed that CNOT1 expression positively correlated with LMNA protein expression. Taken together, these results suggest that the CNOT1-LMNA-Hedgehog signaling pathway axis exerts an oncogenic role in osteosarcoma progression, which could be a potential target for gene therapy.
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Affiliation(s)
- Dong-Dong Cheng
- Department of Orthopedics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, China
| | - Jing Li
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, China
| | - Shi-Jie Li
- Department of Orthopedics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, China
| | - Qing-Cheng Yang
- Department of Orthopedics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, China
| | - Cun-Yi Fan
- Department of Orthopedics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, China
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Corne TDJ, Sieprath T, Vandenbussche J, Mohammed D, Te Lindert M, Gevaert K, Gabriele S, Wolf K, De Vos WH. Deregulation of focal adhesion formation and cytoskeletal tension due to loss of A-type lamins. Cell Adh Migr 2016; 11:447-463. [PMID: 27791462 DOI: 10.1080/19336918.2016.1247144] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The nuclear lamina mechanically integrates the nucleus with the cytoskeleton and extracellular environment and regulates gene expression. These functions are exerted through direct and indirect interactions with the lamina's major constituent proteins, the A-type lamins, which are encoded by the LMNA gene. Using quantitative stable isotope labeling-based shotgun proteomics we have analyzed the proteome of human dermal fibroblasts in which we have depleted A-type lamins by means of a sustained siRNA-mediated LMNA knockdown. Gene ontology analysis revealed that the largest fraction of differentially produced proteins was involved in actin cytoskeleton organization, in particular proteins involved in focal adhesion dynamics, such as actin-related protein 2 and 3 (ACTR2/3), subunits of the ARP2/3 complex, and fascin actin-bundling protein 1 (FSCN1). Functional validation using quantitative immunofluorescence showed a significant reduction in the size of focal adhesion points in A-type lamin depleted cells, which correlated with a reduction in early cell adhesion capacity and an increased cell motility. At the same time, loss of A-type lamins led to more pronounced stress fibers and higher traction forces. This phenotype could not be mimicked or reversed by experimental modulation of the STAT3-IL6 pathway, but it was partly recapitulated by chemical inhibition of the ARP2/3 complex. Thus, our data suggest that the loss of A-type lamins perturbs the balance between focal adhesions and cytoskeletal tension. This imbalance may contribute to mechanosensing defects observed in certain laminopathies.
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Affiliation(s)
- Tobias D J Corne
- a Laboratory of Cell Biology and Histology , Department of Veterinary Sciences, University of Antwerp , Antwerp , Belgium.,b Cell Systems and Imaging Research Group (CSI) , Department of Molecular Biotechnology, Ghent University , Ghent , Belgium
| | - Tom Sieprath
- a Laboratory of Cell Biology and Histology , Department of Veterinary Sciences, University of Antwerp , Antwerp , Belgium.,b Cell Systems and Imaging Research Group (CSI) , Department of Molecular Biotechnology, Ghent University , Ghent , Belgium
| | - Jonathan Vandenbussche
- c Medical Biotechnology Center, VIB , Belgium.,d Department of Biochemistry , Ghent University , Ghent , Belgium
| | - Danahe Mohammed
- e Mechanobiology & Soft Matter Research Group, Interfaces and Complex Fluids Laboratory, Research Institute for Biosciences, University of Mons , Mons , Belgium
| | - Mariska Te Lindert
- f Department of Cell Biology , Radboud University Medical Center , Nijmegen , The Netherlands
| | - Kris Gevaert
- c Medical Biotechnology Center, VIB , Belgium.,d Department of Biochemistry , Ghent University , Ghent , Belgium
| | - Sylvain Gabriele
- e Mechanobiology & Soft Matter Research Group, Interfaces and Complex Fluids Laboratory, Research Institute for Biosciences, University of Mons , Mons , Belgium
| | - Katarina Wolf
- f Department of Cell Biology , Radboud University Medical Center , Nijmegen , The Netherlands
| | - Winnok H De Vos
- a Laboratory of Cell Biology and Histology , Department of Veterinary Sciences, University of Antwerp , Antwerp , Belgium.,b Cell Systems and Imaging Research Group (CSI) , Department of Molecular Biotechnology, Ghent University , Ghent , Belgium
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113
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Izquierdo I, Rosa I, Bravo SB, Guitián E, Pérez-Serra A, Campuzano O, Brugada R, Mangas A, García Á, Toro R. Proteomic identification of putative biomarkers for early detection of sudden cardiac death in a family with a LMNA gene mutation causing dilated cardiomyopathy. J Proteomics 2016; 148:75-84. [PMID: 27457270 DOI: 10.1016/j.jprot.2016.07.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 07/11/2016] [Accepted: 07/21/2016] [Indexed: 01/20/2023]
Abstract
UNLABELLED Dilated cardiomyopathy (DCM) is a severe heart disease characterized by progressive ventricular dilation and impaired systolic function of the left ventricle. We recently identified a novel pathogenic mutation in the LMNA gene in a family affected by DCM showing sudden death background. We now aimed to identify potential biomarkers of disease status, as well as sudden death predictors, in members of this family. We analysed plasma samples from 14 family members carrying the mutation, four of which (with relevant clinical symptoms) were chosen for the proteomic analysis. Plasma samples from these four patients and from four sex- and age-matched healthy controls were processed for their enrichment in low- and medium-abundance proteins (ProteoMiner™) prior to proteomic analysis by 2D-DIGE and MS. 111 spots were found to be differentially regulated between mutation carriers and control groups, 83 of which were successfully identified by MS, corresponding to 41 different ORFs. Some proteins of interest were validated either by turbidimetry or western blot in family members and healthy controls. Actin, alpha-1-antytripsin, clusterin, vitamin-D binding protein and antithrombin-III showed increased levels in plasma from the diseased group. We suggest following these proteins as putative biomarkers for the evaluation of DCM status in LMNA mutation carriers. BIOLOGICAL SIGNIFICANCE We developed a proteomic analysis of plasma samples from a family showing history of dilated cardiomyopathy caused by a LMNA mutation, which may lead to premature death or cardiac transplant. We identified a number of proteins augmented in mutation carriers that could be followed as potential biomarkers for dilated cardiomyopathy on these patients.
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Affiliation(s)
- Irene Izquierdo
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidad de Santiago de Compostela, and Instituto de Investigación Sanitaria (IDIS), Santiago de Compostela, Spain; Departament of Pharmacology, Faculty of Pharmacy, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Isaac Rosa
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidad de Santiago de Compostela, and Instituto de Investigación Sanitaria (IDIS), Santiago de Compostela, Spain
| | - Susana Belén Bravo
- Proteomic Unit, Instituto de Investigación Sanitaria de Santiago de Compostela (IDIS), Hospital Clínico Universitario de Santiago, Santiago de Compostela, Spain
| | - Esteban Guitián
- Mass Spectrometry and Proteomic Unit, Rede de Infraestructuras de Apoio á Investigación e ao Desenvolvemento Tecnolóxico (RIAIDT), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | | | - Oscar Campuzano
- Cardiovascular Genetics Center, IDIBGI, University of Girona, Girona, Spain; Department of Medical Sciences, School of Medicine, University of Girona, Girona, Spain
| | - Ramon Brugada
- Cardiovascular Genetics Center, IDIBGI, University of Girona, Girona, Spain; Department of Medical Sciences, School of Medicine, University of Girona, Girona, Spain; Cardiac Genetics Unit, Hospital Josep Trueta, University of Girona, Girona, Spain
| | - Alipio Mangas
- Medicine Department, School of Medicine, Universidad de Cádiz, Spain
| | - Ángel García
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidad de Santiago de Compostela, and Instituto de Investigación Sanitaria (IDIS), Santiago de Compostela, Spain; Departament of Pharmacology, Faculty of Pharmacy, Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
| | - Rocio Toro
- Medicine Department, School of Medicine, Universidad de Cádiz, Spain.
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114
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Zhao J, Yao H, Li Z, Wang L, Liu G, Wang DW, Wang DW, Liang Z. A novel nonsense mutation in LMNA gene identified by Exome Sequencing in an atrial fibrillation family. Eur J Med Genet 2016; 59:396-400. [PMID: 27373676 DOI: 10.1016/j.ejmg.2016.06.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 06/18/2016] [Accepted: 06/27/2016] [Indexed: 12/13/2022]
Abstract
Genetic factor plays an important role in cardiac arrhythmias. Several loci have been identified associated with this disease. However, they only explained parts of it and more genes and loci remain to be identified. In present study, we recruited a four generation family from the north of China. Four members of this family were diagnosed with atrial fibrillation by electrocardiogram (ECG). We used Exome Sequencing and Sanger sequencing to explore the candidate mutation for cardiac arrhythmia in this family. A nonsense mutation (c.G1494A, p.Trp498Ter) in the LMNA gene were identified as the candidate mutation. This variant is a novel mutation and has not yet been reported for any actual databases. This novel mutation co-segregated exactly with the disease in this family. Meanwhile, it was not detected in 524 control subjects of matched ancestry. According to structural model prediction, the mutation is expected to affect the Lamin Tail Domain (LTD) of lamin A/C protein. So the nonsense mutation discovered in the family probably was a novel mutation associated with familial atrial fibrillation. This discovery expands the mutation spectrum of LMNA and indicates the importance of LMNA in AF.
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Affiliation(s)
- Jinzhao Zhao
- Institute of Hypertension, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hong Yao
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Zongzhe Li
- Institute of Hypertension, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Li Wang
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Guangzong Liu
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Dao W Wang
- Institute of Hypertension, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Dao Wen Wang
- Institute of Hypertension, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
| | - Zhaoguang Liang
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, Harbin, China.
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115
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Furuta M, Sumi-Akamaru H, Takahashi MP, Hayashi YK, Nishino I, Mochizuki H. An elderly-onset limb girdle muscular dystrophy type 1B (LGMD1B) with pseudo-hypertrophy of paraspinal muscles. Neuromuscul Disord 2016; 26:593-7. [PMID: 27220833 DOI: 10.1016/j.nmd.2016.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/02/2016] [Accepted: 05/02/2016] [Indexed: 10/21/2022]
Abstract
Mutations in LMNA, encoding A-type lamins, lead to diverse disorders, collectively called "laminopathies," which affect the striated muscle, cardiac muscle, adipose tissue, skin, peripheral nerve, and premature aging. We describe a patient with limb-girdle muscular dystrophy type 1B (LGMD1B) carrying a heterozygous p.Arg377His mutation in LMNA, in whom skeletal muscle symptom onset was at the age of 65 years. Her weakness started at the erector spinae muscles, which showed marked pseudo-hypertrophy even at the age of 72 years. Her first episode of syncope was at 44 years; however, aberrant cardiac conduction was not revealed until 60 years. The p.Arg377His mutation has been previously reported in several familial LMNA-associated myopathies, most of which showed muscle weakness before the 6th decade. This is the first report of pseudo-hypertrophy of paravertebral muscles in LMNA-associated myopathies. The pseudo-hypertrophy of paravertebral muscles and the elderly-onset of muscle weakness make this case unique and reportable.
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Affiliation(s)
- Mitsuru Furuta
- Department of Neurology, Osaka University Graduate School of Medicine, D-4 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hisae Sumi-Akamaru
- Department of Neurology, Osaka University Graduate School of Medicine, D-4 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Masanori P Takahashi
- Department of Neurology, Osaka University Graduate School of Medicine, D-4 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yukiko K Hayashi
- Department of Pathophysiology, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo 160-8402, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Hideki Mochizuki
- Department of Neurology, Osaka University Graduate School of Medicine, D-4 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
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116
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Guglielmi L, Nardella M, Musa C, Iannetti I, Arisi I, D'Onofrio M, Storti A, Valentini A, Cacci E, Biagioni S, Augusti-Tocco G, D'Agnano I, Felsani A. Lamin A/C Is Required for ChAT-Dependent Neuroblastoma Differentiation. Mol Neurobiol 2017; 54:3729-44. [PMID: 27221609 DOI: 10.1007/s12035-016-9902-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 05/03/2016] [Indexed: 01/21/2023]
Abstract
The mouse neuroblastoma N18TG2 clone is unable to differentiate and is defective for the enzymes of the biosynthesis of neurotransmitters. The forced expression of choline acetyltransferase (ChAT) in these cells results in the synthesis and release of acetylcholine (Ach) and hence in the expression of neurospecific features and markers. To understand how the expression of ChAT triggered neuronal differentiation, we studied the differences in genome-wide transcription profiles between the N18TG2 parental cells and its ChAT-expressing 2/4 derived clone. The engagement of the 2/4 cells in the neuronal developmental program was confirmed by the increase of the expression level of several differentiation-related genes and by the reduction of the amount of transcripts of cell cycle genes. At the same time, we observed a massive reorganization of cytoskeletal proteins in terms of gene expression, with the accumulation of the nucleoskeletal lamina component Lamin A/C in differentiating cells. The increase of the Lmna transcripts induced by ChAT expression in 2/4 cells was mimicked treating the parental N18TG2 cells with the acetylcholine receptor agonist carbachol, thus demonstrating the direct role played by this receptor in neuron nuclei maturation. Conversely, a treatment of 2/4 cells with the muscarinic receptor antagonist atropine resulted in the reduction of the amount of Lmna RNA. Finally, the hypothesis that Lmna gene product might play a crucial role in the ChAT-dependent molecular differentiation cascade was strongly supported by Lmna knockdown in 2/4 cells leading to the downregulation of genes involved in differentiation and cytoskeleton formation and to the upregulation of genes known to regulate self-renewal and stemness.
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117
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Kutbay NO, Yurekli BS, Onay H, Altay CT, Atik T, Hekimsoy Z, Saygili F, Akinci B. A case of familial partial lipodystrophy caused by a novel lamin A/C ( LMNA) mutation in exon 1 (D47N). Eur J Intern Med 2016; 29:37-9. [PMID: 26775134 DOI: 10.1016/j.ejim.2015.12.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 12/10/2015] [Accepted: 12/15/2015] [Indexed: 12/25/2022]
Abstract
BACKGROUND Familial partial lipodystrophy (FPL) is a rare genetic disorder characterized by selective lack of subcutaneous fat which is associated with insulin resistant diabetes. The Dunnigan variety (FPL2) is caused by several missense mutations in the lamin A/C (LMNA) gene, most of which are typically located in exon 8 at the codon position 482. CASE REPORT Here, we report on a Turkish family with FPL2 which is caused by a novel heterozygous missense LMNA mutation in exon 1 (D47N, c.139G>A), in the rod domain of lamins A/C. Fat distribution and metabolic features of LMNA D47N mutation were similar to typical codon 482 mutation. Metabolic abnormalities were observed as a form of insulin resistant diabetes, hypertriglyceridemia, low HDL cholesterol and hepatic steatosis. There was no evidence for neuromuscular and cardiac involvement. CONCLUSION Although it is previously known that alterations in the rod domain of type A lamins are involved in cardiac and neuromuscular diseases, our current observation shows that exon 1 LMNA mutations may be associated with partial lipodystrophy without any cardiac and neurological abnormalities, at least at the time of the presentation.
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Affiliation(s)
| | | | - Huseyin Onay
- Ege University, Division of Medical Genetics, Izmir, Turkey
| | | | - Tahir Atik
- Ege University, Division of Medical Genetics, Izmir, Turkey
| | - Zeliha Hekimsoy
- Celal Bayar University, Division of Endocrinology, Manisa, Turkey
| | - Fusun Saygili
- Ege University, Division of Endocrinology, Izmir, Turkey
| | - Baris Akinci
- Dokuz Eylul University, Division of Endocrinology, Izmir, Turkey
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118
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Abstract
Lamins are intermediate filament proteins able to polymerise and form an organised meshwork underlying the inner nuclear membrane in most differentiated somatic cells. Mutations in the LMNA gene, which encodes the two major lamin A and C isoforms, cause a diverse range of diseases, called laminopathies, including dilated cardiomyopathy, associated with a poor prognosis and high rate of sudden death due to conduction defect and early ventricular arrhythmia. Identification of mutations in LMNA gene in clinical practice is rapidly increasing, as well as comprehensive cardiac and genetic family screening. As a consequence, cardiologists are more and more frequently faced to difficult questions regarding optimal management of patients and relatives, especially timing for prophylactic cardioverter defibrillator. This review focuses on recent data useful for the clinician, as well as therapeutic perspectives both in human and animal models.
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Affiliation(s)
- Philippe Charron
- AP-HP, Hôpital Pitié-Salpêtrière, Centre de référence maladies cardiaques héréditaires, Paris, France; 2. UPMC Université Paris VI, INSERM UMR-S956.,Paris, France
| | - Eloisa Arbustini
- Centre for Inherited Cardiovascular Diseases, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Gisèle Bonne
- INSERM U974; UPMC Université Paris 6; CNRS UMR 7215; Institut de Myologie, Paris, France.,AP-HP, Groupe Hospitalier Pitié-Salpêtrière, UF Cardiogénétique et Myogénétique, Service de Biochimie Métabolique, Paris, France
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119
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Vautrot V, Aigueperse C, Oillo-Blanloeil F, Hupont S, Stevenin J, Branlant C, Behm-Ansmant I. Enhanced SRSF5 Protein Expression Reinforces Lamin A mRNA Production in HeLa Cells and Fibroblasts of Progeria Patients. Hum Mutat 2016; 37:280-91. [PMID: 26670336 DOI: 10.1002/humu.22945] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Accepted: 12/01/2015] [Indexed: 01/01/2023]
Abstract
The Hutchinson Gilford Progeria Syndrome (HGPS) is a rare genetic disease leading to accelerated aging. Three mutations of the LMNA gene leading to HGPS were identified. The more frequent ones, c.1824C>T and c.1822G>A, enhance the use of the intron 11 progerin 5'splice site (5'SS) instead of the LMNA 5'SS, leading to the production of the truncated dominant negative progerin. The less frequent c.1868C>G mutation creates a novel 5'SS (LAΔ35 5'SS), inducing the production of another truncated LMNA protein (LAΔ35). Our data show that the progerin 5'SS is used at low yield in the absence of HGPS mutation, whereas utilization of the LAΔ35 5'SS is dependent upon the presence of the c.1868C>G mutation. In the perspective to correct HGPS splicing defects, we investigated whether SR proteins can modify the relative yields of utilization of intron 11 5'SSs. By in cellulo and in vitro assays, we identified SRSF5 as a direct key regulator increasing the utilization of the LMNA 5'SS in the presence of the HGPS mutations. Enhanced SRSF5 expression in dermal fibroblasts of HGPS patients as well as PDGF-BB stimulation of these cells decreased the utilization of the progerin 5'SS, and improves nuclear morphology, opening new therapeutic perspectives for premature aging.
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Affiliation(s)
- Valentin Vautrot
- IMoPA (Ingénierie Moléculaire et Physiopathologie Articulaire), UMR 7365 CNRS-UL, Biopôle de l'Université de Lorraine, Vandoeuvre-lès-Nancy, 54505, France
| | - Christelle Aigueperse
- IMoPA (Ingénierie Moléculaire et Physiopathologie Articulaire), UMR 7365 CNRS-UL, Biopôle de l'Université de Lorraine, Vandoeuvre-lès-Nancy, 54505, France
| | - Florence Oillo-Blanloeil
- IMoPA (Ingénierie Moléculaire et Physiopathologie Articulaire), UMR 7365 CNRS-UL, Biopôle de l'Université de Lorraine, Vandoeuvre-lès-Nancy, 54505, France
| | - Sébastien Hupont
- FR3209 CNRS, Biopôle de l'Université de Lorraine, Vandoeuvre-lès-Nancy, 54505, France
| | - James Stevenin
- IGBMC Department of Functional Genomics and Cancer, CNRS UMR 7104, INSERM U 964, University of Strasbourg, Illkirch Cedex, 67404, France
| | - Christiane Branlant
- IMoPA (Ingénierie Moléculaire et Physiopathologie Articulaire), UMR 7365 CNRS-UL, Biopôle de l'Université de Lorraine, Vandoeuvre-lès-Nancy, 54505, France
| | - Isabelle Behm-Ansmant
- IMoPA (Ingénierie Moléculaire et Physiopathologie Articulaire), UMR 7365 CNRS-UL, Biopôle de l'Université de Lorraine, Vandoeuvre-lès-Nancy, 54505, France
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120
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Díaz-Manera J, Alejaldre A, González L, Olivé M, Gómez-Andrés D, Muelas N, Vílchez JJ, Llauger J, Carbonell P, Márquez-Infante C, Fernández-Torrón R, Poza JJ, López de Munáin A, González-Quereda L, Mirabet S, Clarimon J, Gallano P, Rojas-García R, Gallardo E, Illa I. Muscle imaging in muscle dystrophies produced by mutations in the EMD and LMNA genes. Neuromuscul Disord 2015; 26:33-40. [PMID: 26573435 DOI: 10.1016/j.nmd.2015.10.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 09/23/2015] [Accepted: 10/06/2015] [Indexed: 10/22/2022]
Abstract
Identifying the mutated gene that produces a particular muscle dystrophy is difficult because different genotypes may share a phenotype and vice versa. Muscle MRI is a useful tool to recognize patterns of muscle involvement in patients with muscle dystrophies and to guide the diagnosis process. The radiologic pattern of muscle involvement in patients with mutations in the EMD and LMNA genes has not been completely established. Our objective is to describe the pattern of muscle fatty infiltration in patients with mutations in the EMD and in the LMNA genes and to search for differences between the two genotypes that could be helpful to guide the genetic tests. We conducted a national multicenter study in 42 patients, 10 with mutations in the EMD gene and 32 with mutations in the LMNA gene. MRI or CT was used to study the muscles from trunk to legs. Patients had a similar pattern of fatty infiltration regardless of whether they had the mutation in the EMD or LMNA gene. The main muscles involved were the paravertebral, glutei, quadriceps, biceps, semitendinosus, semimembranosus, adductor major, soleus, and gastrocnemius. Involvement of peroneus muscle, which was more frequently affected in patients with mutations in the EMD gene, was useful to differentiate between the two genotypes. Muscle MRI/CT identifies a similar pattern of muscle fatty infiltration in patients with mutations in the EMD or the LMNA genes. The involvement of peroneus muscles could be useful to conduct genetic analysis in patients with an EDMD phenotype.
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Affiliation(s)
- Jordi Díaz-Manera
- Neuromuscular Disorders Unit, Neurology Department, Universitat Autónoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain.
| | - Aida Alejaldre
- Neuromuscular Disorders Unit, Neurology Department, Universitat Autónoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain
| | - Laura González
- Institute of Neuropathology, Department of Pathology, IDIBELL-Hospital de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain; Neuromuscular Unit, Department of Neurology, IDIBELL-Hospital de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain; Department of Neurology, Hospital de Viladecans, Barcelona, Spain
| | - Montse Olivé
- Institute of Neuropathology, Department of Pathology, IDIBELL-Hospital de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain; Neuromuscular Unit, Department of Neurology, IDIBELL-Hospital de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain; Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Spain
| | - David Gómez-Andrés
- Pediatric Department, Hospital Universitario Infanta Sofía, TRADESMA IdiPaz-UAM, Madrid, Spain
| | - Nuria Muelas
- Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain; Department of Neurology, Hospital Universitari I Politècnic La Fe, Valencia, Spain
| | - Juan José Vílchez
- Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain; Department of Neurology, Hospital Universitari I Politècnic La Fe, Valencia, Spain
| | - Jaume Llauger
- Radiology Department, Universitat Autònoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - Pilar Carbonell
- Neuromuscular Disorders Unit, Department of Neurology and Neurophysiology, Hospital Universitario Virgen del Rocío, Sevilla, Spain
| | - Celedonio Márquez-Infante
- Neuromuscular Disorders Unit, Department of Neurology and Neurophysiology, Hospital Universitario Virgen del Rocío, Sevilla, Spain
| | - Roberto Fernández-Torrón
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Spain; Department of Neurology, Hospital Universitario Donostia, Donostia-San Sebastián, Spain; Neurosciences Area, Biodonostia Institute, Donostia-San Sebastián, Spain
| | - Juan José Poza
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Spain; Neuromuscular Disorders Unit, Department of Neurology and Neurophysiology, Hospital Universitario Virgen del Rocío, Sevilla, Spain
| | - Adolfo López de Munáin
- Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Spain; Department of Neurology, Hospital Universitario Donostia, Donostia-San Sebastián, Spain; Neurosciences Area, Biodonostia Institute, Donostia-San Sebastián, Spain
| | - Lidia González-Quereda
- Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain; Department of Neurology, Hospital Universitario Donostia, Donostia-San Sebastián, Spain; Neurosciences Area, Biodonostia Institute, Donostia-San Sebastián, Spain
| | - Sonia Mirabet
- Cardiology Department, Universitat Autònoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - Jordi Clarimon
- Neuromuscular Disorders Unit, Neurology Department, Universitat Autónoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Spain
| | - Pía Gallano
- Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain; Genetic Department, Universitat Autònoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - Ricard Rojas-García
- Neuromuscular Disorders Unit, Neurology Department, Universitat Autónoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain
| | - Eduard Gallardo
- Neuromuscular Disorders Unit, Neurology Department, Universitat Autónoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain
| | - Isabel Illa
- Neuromuscular Disorders Unit, Neurology Department, Universitat Autónoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain
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Alastalo TP, West G, Li SP, Keinänen A, Helenius M, Tyni T, Lapatto R, Turanlahti M, Heikkilä P, Kääriäinen H, Laakso M, Mauermann M, Herrmann H, Pihkala J, Taimen P. LMNA Mutation c.917T>G (p.L306R) Leads to Deleterious Hyper-Assembly of Lamin A/C and Associates with Severe Right Ventricular Cardiomyopathy and Premature Aging. Hum Mutat 2015; 36:694-703. [PMID: 25820511 DOI: 10.1002/humu.22793] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 03/20/2015] [Indexed: 11/09/2022]
Abstract
Mutations in the LMNA gene coding for the nuclear lamina proteins lamin A and its smaller splice form lamin C associate with a heterogeneous group of diseases collectively called laminopathies. Here, we describe a 2-year-old patient with a previously undescribed phenotype including right ventricular cardiomyopathy, progeroid features, and premature death. Sequencing of LMNA revealed a novel heterozygous de novo mutation p.L306R located in the α-helical rod domain of A-type lamins. Fibroblasts from the patient showed reduced proliferation and early premature replicative senescence, as characterized by progressive hyperlobulation of the nuclei, abnormally clustered centromeres, loss of lamin B1, and reorganization of promyelocytic leukemia nuclear bodies. Furthermore, the patient cells were more sensitive to double-strand DNA breaks. Similar structural and phenotypic defects were observed in normal fibroblasts transfected with FLAG-tagged p.L306R lamin A. Correspondingly, in vitro assembly studies revealed that the p.L306R generates a "hyper-assembly" mutant of lamin A that forms extensive fiber arrays under physiological conditions where wild-type lamin A is still largely soluble. In summary, we report a novel LMNA p.L306R mutation that leads to previously undescribed hyper-assembly of lamin A, heavy distortion of nuclear shape and that manifests as right ventricular cardiomyopathy and premature aging.
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Affiliation(s)
- Tero-Pekka Alastalo
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.,Blueprint Genetics, Helsinki, Finland
| | - Gun West
- Department of Pathology, University of Turku and Turku University Hospital, Turku, Finland.,MediCity Research Laboratory, University of Turku, Turku, Finland
| | - Song-Ping Li
- Department of Pathology, University of Turku and Turku University Hospital, Turku, Finland.,MediCity Research Laboratory, University of Turku, Turku, Finland
| | - Anni Keinänen
- Department of Pathology, University of Turku and Turku University Hospital, Turku, Finland.,MediCity Research Laboratory, University of Turku, Turku, Finland
| | - Mikko Helenius
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Tiina Tyni
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Risto Lapatto
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Maila Turanlahti
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Päivi Heikkilä
- Department of Pathology, Helsinki Central University Hospital, Helsinki, Finland
| | - Helena Kääriäinen
- National Institute of Health and Welfare, Finland, and Department of Clinical Genetics, Helsinki University Central Hospital, Helsinki, Finland
| | - Markku Laakso
- Department of Medicine, University of Eastern Finland, Kuopio, Finland
| | - Monika Mauermann
- Functional Architecture of the Cell Group, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Harald Herrmann
- Functional Architecture of the Cell Group, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Jaana Pihkala
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Pekka Taimen
- Department of Pathology, University of Turku and Turku University Hospital, Turku, Finland.,MediCity Research Laboratory, University of Turku, Turku, Finland
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122
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Banerjee A, Ghoshal PK, Sengupta K. Novel linkage of LMNA Single Nucleotide Polymorphism with Dilated Cardiomyopathy in an Indian case study. Int J Cardiol Heart Vasc 2015; 7:99-105. [PMID: 28785654 PMCID: PMC5497236 DOI: 10.1016/j.ijcha.2015.02.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Revised: 02/09/2015] [Accepted: 02/21/2015] [Indexed: 11/19/2022]
Abstract
BACKGROUND Dilated Cardiomyopathy (DCM) is one of the most commonly encountered heart diseases reported globally. It is characterized by enlarged ventricles with impaired systolic and diastolic functions. Mutations in LMNA gene are one of the causative factors to precipitate the disease. However, association of SNPs of LMNA with DCM in particular has not been well documented. METHOD Here we present a limited and restricted case study of patients from south eastern part of India afflicted with idiopathic DCM and conduction defects. By using next generation sequencing we have sequenced the exons of LMNA gene from genomic DNA isolated from patients. RESULT We have identified the linkage of 8 different LMNA SNPs with idiopathic DCM viz. rs121117552, rs538089, rs505058, rs4641, rs646840, rs534807, rs80356803 and rs7339. These SNPs are scattered throughout the gene with prevalence for the region encoding the central rod domain of lamin A/C. CONCLUSION Most of these SNPs in LMNA were previously reported to be involved in various disorders other than DCM. We conclude that, variation in LMNA is one of the major underlying genetic causes for the pathogenesis of DCM, as observed in few Indian populations.
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Affiliation(s)
- Avinanda Banerjee
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - Pradip K. Ghoshal
- Department of Cardiology & Medicine, N.R.S. Medical College & Hospital, 138 A. J. C Bose Road, Kolkata 700014, India
| | - Kaushik Sengupta
- Biophysics & Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
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123
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Ruggiero L, Fiorillo C, Tessa A, Manganelli F, Iodice R, Dubbioso R, Vitale F, Storti E, Soscia E, Santorelli F, Santoro L. Muscle fiber type disproportion (FTD) in a family with mutations in the LMNA gene. Muscle Nerve 2015; 51:604-8. [PMID: 25256213 DOI: 10.1002/mus.24467] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/22/2014] [Indexed: 01/04/2023]
Abstract
INTRODUCTION Mutations in the lamin A/C protein cause laminopathies, a heterogeneous group of disorders that include recessive axonal neuropathy (CMT2B1), Emery-Dreifuss muscular dystrophy (EDMD), limb-girdle muscular dystrophy (LGMD), dilated cardiomyopathy with conduction defect, and different forms of lipodystrophy and progeria. METHODS We provide clinical, histopathological, muscle imaging, and cardiac features of a family with heterozygous mutation in the LMNA gene. RESULTS We identified heterozygous mutations (c.80C> T; pT27I) in the LMNA gene in 3 family members who had the LGMD phenotype with onset in their early thirties and cardiac conduction defects or dilated cardiomyopathy. Interestingly, muscle biopsies showed changes consistent with fiber type disproportion (FTD). CONCLUSIONS Fiber type disproportion has been reported only anecdotally in muscle biopsies of patients with LMNA mutations. Our report further supports this association and suggests inclusion of molecular testing for LMNA in the differential diagnosis of myopathies with FTD due to the risk for life threatening events.
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Affiliation(s)
- Lucia Ruggiero
- Department of Neurosciences, Reproductive and Odontostomatological Sciences, University Federico II of Naples, Via Sergio Pansini 5, 80131, Naples, Italy
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Parnham S, Selvanayagam JB, Haan E, Heddle W, De Pasquale CG. Lamin A/C mutation: An easily missed opportunity. Int J Cardiol 2015; 181:48-9. [PMID: 25481314 DOI: 10.1016/j.ijcard.2014.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 12/01/2014] [Indexed: 11/18/2022]
MESH Headings
- Atrioventricular Block/diagnosis
- Atrioventricular Block/etiology
- Cardiomyopathy, Dilated/complications
- Cardiomyopathy, Dilated/diagnosis
- Cardiomyopathy, Dilated/genetics
- Cardiomyopathy, Dilated/therapy
- Death, Sudden, Cardiac/etiology
- Death, Sudden, Cardiac/prevention & control
- Defibrillators, Implantable
- Disease Management
- Echocardiography/methods
- Electrocardiography, Ambulatory/methods
- Humans
- Lamin Type A/genetics
- Male
- Middle Aged
- Mutation
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Affiliation(s)
- Susie Parnham
- Department of Cardiovascular Medicine, Flinders Medical Centre, Australia; School of Medicine, Flinders University, Australia.
| | - Joseph B Selvanayagam
- Department of Cardiovascular Medicine, Flinders Medical Centre, Australia; School of Medicine, Flinders University, Australia
| | - Eric Haan
- South Australian Clinical Genetics Service, SA Pathology (at Women's and Children's Hospital), North Adelaide, Australia; School of Paediatrics and Reproductive Health, The University of Adelaide, Adelaide, Australia
| | - William Heddle
- Department of Cardiovascular Medicine, Flinders Medical Centre, Australia; School of Medicine, Flinders University, Australia
| | - Carmine G De Pasquale
- Department of Cardiovascular Medicine, Flinders Medical Centre, Australia; School of Medicine, Flinders University, Australia
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Fichera M, Barone R, Grillo L, De Grandi M, Fiore V, Morana I, Maniscalchi T, Vinci M, Amata S, Spalletta A, Sorge G, Signorelli SS. Familial 1q22 microduplication associated with psychiatric disorders, intellectual disability and late-onset autoimmune inflammatory response. Mol Cytogenet 2014; 7:90. [PMID: 25540671 PMCID: PMC4276019 DOI: 10.1186/s13039-014-0090-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 11/16/2014] [Indexed: 11/10/2022] Open
Abstract
Background Despite the extensive use of chromosomal microarray technologies in patients with neurodevelopmental disorders has permitted the identification of an increasing number of causative submicroscopic rearrangements throughout the genome, constitutional duplications involving chromosome 1q22 have seldom been described in those patients. Results We report on a pedigree with seven affected members showing varying degrees of behavioural and emotional disturbances including general anxiety disorder, mood disorders, and intellectual disability. Two adult female patients also showed late onset autoimmune inflammatory responses characterized by alopecia, skin ulcers secondary to inflammatory vasculitis, interstitial lung disease, and Raynaud’s phenomenon. Array-CGH analysis identified in the affected individuals a 290 Kb microduplication in the chromosome 1q22. The rearrangement involves eleven known genes and is not present in the databases of polymorphic copy number variants. Conclusions The rearrangement segregates with the neurological clinical features observed in our patients, suggesting that dosage imbalance of one or more genes in this genomic region may lead to the observed phenotype. The association between the microduplication and the inflammatory disease is much less evident. Additional reported patients carrying similar microduplications are needed to clarify this aspect.
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Affiliation(s)
- Marco Fichera
- Department of Biomedical and Biotechnological Sciences, Medical Genetics, University of Catania, Catania, Italy ; Laboratory of Medical Genetics, I.R.C.C.S. Associazione Oasi Maria Santissima, Troina, Italy
| | - Rita Barone
- Department of Clinical and Experimental Medicine, Child Neurology and Psychiatry, University of Catania, Catania, Italy
| | - Lucia Grillo
- Laboratory of Medical Genetics, I.R.C.C.S. Associazione Oasi Maria Santissima, Troina, Italy
| | - Mariaclara De Grandi
- Department of Clinical and Experimental Medicine, Child Neurology and Psychiatry, University of Catania, Catania, Italy
| | - Valerio Fiore
- Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Ignazio Morana
- Internal Medicine Unit, Garibaldi Hospital, Catania, Italy
| | - Tiziana Maniscalchi
- Department of Biomedical and Biotechnological Sciences, Medical Genetics, University of Catania, Catania, Italy
| | - Mirella Vinci
- Laboratory of Medical Genetics, I.R.C.C.S. Associazione Oasi Maria Santissima, Troina, Italy
| | - Silvestra Amata
- Laboratory of Medical Genetics, I.R.C.C.S. Associazione Oasi Maria Santissima, Troina, Italy
| | - Angela Spalletta
- Laboratory of Medical Genetics, I.R.C.C.S. Associazione Oasi Maria Santissima, Troina, Italy
| | - Giovanni Sorge
- Department of Clinical and Experimental Medicine, Pediatric Clinic, University of Catania, Catania, Italy
| | - Salvatore Santo Signorelli
- Department of Clinical and Experimental Medicine, Medical Angiology Unit, University of Catania, Catania, Italy
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Roberts JL, Hovanes K, Dasouki M, Manzardo AM, Butler MG. Chromosomal microarray analysis of consecutive individuals with autism spectrum disorders or learning disability presenting for genetic services. Gene 2014; 535:70-8. [PMID: 24188901 PMCID: PMC4423794 DOI: 10.1016/j.gene.2013.10.020] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 09/26/2013] [Accepted: 10/10/2013] [Indexed: 01/15/2023]
Abstract
Chromosomal microarray analysis is now commonly used in clinical practice to identify copy number variants (CNVs) in the human genome. We report our experience with the use of the 105 K and 180K oligonucleotide microarrays in 215 consecutive patients referred with either autism or autism spectrum disorders (ASD) or developmental delay/learning disability for genetic services at the University of Kansas Medical Center during the past 4 years (2009-2012). Of the 215 patients [140 males and 75 females (male/female ratio=1.87); 65 with ASD and 150 with learning disability], abnormal microarray results were seen in 45 individuals (21%) with a total of 49 CNVs. Of these findings, 32 represented a known diagnostic CNV contributing to the clinical presentation and 17 represented non-diagnostic CNVs (variants of unknown significance). Thirteen patients with ASD had a total of 14 CNVs, 6 CNVs recognized as diagnostic and 8 as non-diagnostic. The most common chromosome involved in the ASD group was chromosome 15. For those with a learning disability, 32 patients had a total of 35 CNVs. Twenty-six of the 35 CNVs were classified as a known diagnostic CNV, usually a deletion (n=20). Nine CNVs were classified as an unknown non-diagnostic CNV, usually a duplication (n=8). For the learning disability subgroup, chromosomes 2 and 22 were most involved. Thirteen out of 65 patients (20%) with ASD had a CNV compared with 32 out of 150 patients (21%) with a learning disability. The frequency of chromosomal microarray abnormalities compared by subject group or gender was not statistically different. A higher percentage of individuals with a learning disability had clinical findings of seizures, dysmorphic features and microcephaly, but not statistically significant. While both groups contained more males than females, a significantly higher percentage of males were present in the ASD group.
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Key Words
- A2BP1
- ACADL
- ACOXL
- ADIPOQ
- ALS2 chromosome region gene 8
- ALS2CR8
- ANKRD11
- ANOVA
- ASD
- Autism spectrum disorders (ASD)
- BAC
- BCL2-like 11 gene
- BCL2L11
- CACNA1C
- CHRNA7
- CNV
- COBL
- CT
- Chromosomal microarray analysis
- Copy number variant (CNV)
- DLG1
- DLG4
- DNA
- Developmental delay
- EEF1B2
- EEG
- F-box only 45 gene
- FAM117B
- FAT tumor suppressor 1 gene
- FAT1
- FBXO45
- FISH
- FXR2
- FZD5
- GALR1
- GATA zinc finger domain-containing protein 2B gene
- GATAD2B
- GDNF-inducible zinc finger protein 1 gene
- GZF1
- HAX1
- HCLS1-associated protein X1 gene
- HDAC
- IDH1
- IL1RAPL1
- ITPR1
- KLF7
- KNG1
- LINS
- LMNA
- Learning disability
- MAP2
- MBP
- MRPL19
- MYL1
- NADH-ubiquinone oxidoreductase Fe-S protein 1 gene
- NDUFS1
- NLGN2
- NPHP1
- NRXN1
- PAK2
- PARK2
- PMP22
- POLG
- PRPF8
- PTEN
- PTH2R
- RPE
- SACS
- SD
- SH2B adaptor protein 1 gene
- SH2B1
- SH3 and multiple ankyrin repeat domains 3 gene
- SHANK3
- SHOX
- SMARCA4
- STAG2
- SUMF1
- SWI/SNF-related, matrix-associated, actin-dependent regulator of chromatin, subfamily A, member gene
- TRAPPC2
- UCSC
- USP6
- University of California, Santa Cruz
- X-linked inhibitor of apoptosis gene
- XIAP
- YWHAE
- ZNF407
- aCGH
- acyl-coA dehydrogenase, long chain gene
- acyl-coA oxidase-like gene
- adipocyte-, C1q-, and collagen domain containing gene
- analysis of variance
- ankyrin repeat domain-containing protein 11 gene
- array comparative genomic hybridization
- ataxin 2-binding protein 1 gene
- autism spectrum disorder
- bacterial artificial chromosome
- calcium channel, voltage dependent, L-type, alpha 1C subunit gene
- cholinergic receptor, neuronal nicotinic, alpha polypeptide 7 gene
- computed tomography
- copy number variant
- cordon-bleu gene
- deoxyribonucleic acid
- discs, large homolog 1 gene
- discs, large homolog 4 gene
- electroencephalogram
- eukaryotic translation elongation factor 1, beta-2 gene
- family with sequence similarity 117, member B gene
- fluorescence in situ hybridization
- fragile X mental retardation, autosomal homolog 2 gene
- frizzled 5 gene
- galanin receptor 1 gene
- histone deacetylase gene
- inositol 1,4,5-triphosphate receptor, type 1 gene
- interleukin 1 receptor accessory protein-like 1 gene
- isocitrate dehydrogenase 1 gene
- kininogen 1 gene
- kruppel-like factor 7 gene
- lamin A gene
- lines homolog gene
- microtubule-associated protein 2 gene
- mitochondrial ribosomal protein L19 gene
- myelin basic protein gene
- myosin, light peptide 1 gene
- nephrocystin 1 gene
- neurexin 1 gene
- neuroligin 2 gene
- parathyroid hormone receptor 2 gene
- parkin gene
- peripheral myelin protein 22 gene
- phosphatase and tensin homolog gene
- polymerase gamma gene
- precursor mRNA-processing factor 8 gene
- protein-activated kinase 2 gene
- ribulose 5-phosphate 3-epimerase gene
- sacsin gene
- short stature homeobox gene
- standard deviation
- stromal antigen 2 gene
- sulfatase-modifying factor 1 gene
- tracking protein particle complex, subunit 2 gene
- tyrosine 3-monooxygenase/tryptophan 5-monooxygenase activation protein, epsilon isoform gene
- ubiquitin-specific protease 6 gene
- zinc finger protein 407 gene
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Affiliation(s)
- Jennifer L Roberts
- Departments of Psychiatry, Behavioral Sciences and Pediatrics, The University of Kansas, Medical Center, Kansas City, KS, USA
| | | | - Majed Dasouki
- Department of Neurology, The University of Kansas Medical Center, Kansas City, KS, USA; King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Ann M Manzardo
- Departments of Psychiatry, Behavioral Sciences and Pediatrics, The University of Kansas, Medical Center, Kansas City, KS, USA
| | - Merlin G Butler
- Departments of Psychiatry, Behavioral Sciences and Pediatrics, The University of Kansas, Medical Center, Kansas City, KS, USA.
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Steiner J, Bernstein HG, Schiltz K, Müller UJ, Westphal S, Drexhage HA, Bogerts B. Immune system and glucose metabolism interaction in schizophrenia: a chicken-egg dilemma. Prog Neuropsychopharmacol Biol Psychiatry 2014; 48:287-94. [PMID: 23085507 DOI: 10.1016/j.pnpbp.2012.09.016] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2012] [Revised: 09/15/2012] [Accepted: 09/22/2012] [Indexed: 12/15/2022]
Abstract
Impaired glucose metabolism and the development of metabolic syndrome contribute to a reduction in the average life expectancy of individuals with schizophrenia. It is unclear whether this association simply reflects an unhealthy lifestyle or whether weight gain and impaired glucose tolerance in patients with schizophrenia are directly attributable to the side effects of atypical antipsychotic medications or disease-inherent derangements. In addition, numerous previous studies have highlighted alterations in the immune system of patients with schizophrenia. Increased concentrations of interleukin (IL)-1, IL-6, and transforming growth factor-beta (TGF-β) appear to be state markers, whereas IL-12, interferon-gamma (IFN-γ), tumor necrosis factor-alpha (TNF-α), and soluble IL-2 receptor (sIL-2R) appear to be trait markers of schizophrenia. Moreover, the mononuclear phagocyte system (MPS) and microglial activation are involved in the early course of the disease. This review illustrates a "chicken-egg dilemma", as it is currently unclear whether impaired cerebral glucose utilization leads to secondary disturbances in peripheral glucose metabolism, an increased risk of cardiovascular complications, and accompanying pro-inflammatory changes in patients with schizophrenia or whether immune mechanisms may be involved in the initial pathogenesis of schizophrenia, which leads to disturbances in glucose metabolism such as metabolic syndrome. Alternatively, shared underlying factors may be responsible for the co-occurrence of immune system and glucose metabolism disturbances in schizophrenia.
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Affiliation(s)
- Johann Steiner
- Department of Psychiatry, University of Magdeburg, Magdeburg, Germany; Center for Behavioral Brain Sciences, Magdeburg, Germany.
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Mateos J, De la Fuente A, Lesende-Rodriguez I, Fernández-Pernas P, Arufe MC, Blanco FJ. Lamin A deregulation in human mesenchymal stem cells promotes an impairment in their chondrogenic potential and imbalance in their response to oxidative stress. Stem Cell Res 2013; 11:1137-48. [PMID: 23994728 DOI: 10.1016/j.scr.2013.07.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Revised: 07/13/2013] [Accepted: 07/16/2013] [Indexed: 02/05/2023] Open
Abstract
In the present study, we examined the effect of the over-expression of LMNA, or its mutant form progerin (PG), on the mesoderm differentiation potential of mesenchymal stem cells (MSCs) from human umbilical cord (UC) stroma using a recently described differentiation model employing spheroid formation. Accumulation of lamin A (LMNA) was previously associated with the osteoarthritis (OA) chondrocyte phenotype. Mutations of this protein are linked to laminopathies and specifically to Hutchinson-Gilford Progeria Syndrome (HGPS), an accelerated aging disease. Some authors have proposed that a deregulation of LMNA affects the differentiation potential of stem cells. The chondrogenic potential is defective in PG-MSCs, although both PG and LMNA transduced MSCs, have an increase in hypertrophy markers during chondrogenic differentiation. Furthermore, both PG and LMNA-MSCs showed a decrease in manganese superoxide dismutase (MnSODM), an increase of mitochondrial MnSODM-dependent reactive oxygen species (ROS) and alterations in their migration capacity. Finally, defects in chondrogenesis are partially reversed by periodic incubation with ROS-scavenger agent that mimics MnSODM effect. Our results indicate that over-expression of LMNA or PG by lentiviral gene delivery leads to defects in chondrogenic differentiation potential partially due to an imbalance in oxidative stress.
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Affiliation(s)
- Jesús Mateos
- Rheumatology Division, ProteoRed/ISCIII, INIBIC-Hospital Universitario A Coruña, 15006 A Coruña, Spain; CIBER-BBN, Spain
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Holly AC, Melzer D, Pilling LC, Fellows AC, Tanaka T, Ferrucci L, Harries LW. Changes in splicing factor expression are associated with advancing age in man. Mech Ageing Dev 2013; 134:356-66. [PMID: 23747814 PMCID: PMC5863542 DOI: 10.1016/j.mad.2013.05.006] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 05/16/2013] [Accepted: 05/25/2013] [Indexed: 11/22/2022]
Abstract
Human ageing is associated with decreased cellular plasticity and adaptability. Changes in alternative splicing with advancing age have been reported in man, which may arise from age-related alterations in splicing factor expression. We determined whether the mRNA expression of key splicing factors differed with age, by microarray analysis in blood from two human populations and by qRT-PCR in senescent primary fibroblasts and endothelial cells. Potential regulators of splicing factor expression were investigated by siRNA analysis. Approximately one third of splicing factors demonstrated age-related transcript expression changes in two human populations. Ataxia Telangiectasia Mutated (ATM) transcript expression correlated with splicing factor expression in human microarray data. Senescent primary fibroblasts and endothelial cells also demonstrated alterations in splicing factor expression, and changes in alternative splicing. Targeted knockdown of the ATM gene in primary fibroblasts resulted in up-regulation of some age-responsive splicing factor transcripts. We conclude that isoform ratios and splicing factor expression alters with age in vivo and in vitro, and that ATM may have an inhibitory role on the expression of some splicing factors. These findings suggest for the first time that ATM, a core element in the DNA damage response, is a key regulator of the splicing machinery in man.
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Affiliation(s)
- Alice C. Holly
- Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, University of Exeter, Exeter EX1 2LU, UK
| | - David Melzer
- Epidemiology and Public Health, University of Exeter Medical School, University of Exeter, Exeter EX1 2LU, UK
| | - Luke C. Pilling
- Epidemiology and Public Health, University of Exeter Medical School, University of Exeter, Exeter EX1 2LU, UK
| | - Alexander C. Fellows
- Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, University of Exeter, Exeter EX1 2LU, UK
| | | | | | - Lorna W. Harries
- Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, University of Exeter, Exeter EX1 2LU, UK
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Al-Saaidi R, Rasmussen TB, Palmfeldt J, Nissen PH, Beqqali A, Hansen J, Pinto YM, Boesen T, Mogensen J, Bross P. The LMNA mutation p.Arg321Ter associated with dilated cardiomyopathy leads to reduced expression and a skewed ratio of lamin A and lamin C proteins. Exp Cell Res 2013; 319:3010-9. [PMID: 24001739 DOI: 10.1016/j.yexcr.2013.08.024] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 07/31/2013] [Accepted: 08/19/2013] [Indexed: 11/19/2022]
Abstract
Dilated cardiomyopathy (DCM) is a disease of the heart muscle characterized by cardiac chamber enlargement and reduced systolic function of the left ventricle. Mutations in the LMNA gene represent the most frequent known genetic cause of DCM associated with disease of the conduction systems. The LMNA gene generates two major transcripts encoding the nuclear lamina major components lamin A and lamin C by alternative splicing. Both haploinsuffiency and dominant negative effects have been proposed as disease mechanism for premature termination codon (PTC) mutations in LMNA. These mechanisms however are still not clearly established. In this study, we used a representative LMNA nonsense mutation, p.Arg321Ter, to shed light on the molecular disease mechanisms. Cultured fibroblasts from three DCM patients carrying this mutation were analyzed. Quantitative reverse transcriptase PCR and sequencing of these PCR products indicated that transcripts from the mutant allele were degraded by the nonsense-mediated mRNA decay (NMD) mechanism. The fact that no truncated mutant protein was detectable in western blot (WB) analysis strengthens the notion that the mutant transcript is efficiently degraded. Furthermore, WB analysis showed that the expression of lamin C protein was reduced by the expected approximately 50%. Clearly decreased lamin A and lamin C levels were also observed by immunofluorescence microscopy analysis. However, results from both WB and nano-liquid chromatography/mass spectrometry demonstrated that the levels of lamin A protein were more reduced suggesting an effect on expression of lamin A from the wild type allele. PCR analysis of the ratio of lamin A to lamin C transcripts showed unchanged relative amounts of lamin A transcript suggesting that the effect on the wild type allele was operative at the protein level. Immunofluorescence microscopy analysis showed no abnormal nuclear morphology of patient fibroblast cells. Based on these data, we propose that heterozygosity for the nonsense mutation causes NMD degradation of the mutant transcripts blocking expression of the truncated mutant protein and an additional trans effect on lamin A protein levels expressed from the wild type allele. We discuss the possibility that skewing of the lamin A to lamin C ratio may contribute to ensuing processes that destabilize cardiomyocytes and trigger cardiomyopathy.
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Affiliation(s)
- Rasha Al-Saaidi
- Research Unit for Molecular Medicine, Aarhus University and Aarhus University Hospital, Aarhus, Denmark
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131
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Luo YB, Mitrpant C, Johnsen R, Fabian V, Needham M, Fletcher S, Wilton SD, Mastaglia FL. Investigation of splicing changes and post-translational processing of LMNA in sporadic inclusion body myositis. Int J Clin Exp Pathol 2013; 6:1723-1733. [PMID: 24040437 PMCID: PMC3759479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 08/11/2013] [Indexed: 06/02/2023]
Abstract
Some features of sporadic inclusion body myositis (s-IBM) suggest that there is acceleration of the normal ageing process in muscle tissue. LMNA encodes the nuclear lamina proteins lamin A/C through alternative splicing, and aberrant splicing of exon 11 leads to the premature ageing disease, Hutchinson-Gilford progeria syndrome. Progerin, the pathogenic isoform expressed in HGPS tissues, has also been detected at low levels in tissues of normal individuals with aging. We therefore investigated the alternative splicing of LMNA gene transcripts, and the post-translational processing of prelamin A, in s-IBM and control muscle samples. Age-related low level expression of the progerin transcript was detected in both s-IBM and control muscles, but was not increased in s-IBM and there was no increase in progerin protein or demonstrable accumulation of intermediate prelamin isoforms in the s-IBM muscles. However, an age-related shift in the balance of splicing towards lamin A-related transcripts, which was present in normal muscles, was not found in s-IBM. Our findings indicate that while there are changes in the patterns of LMNA splicing in s-IBM muscle which are probably secondary to the underlying pathological process, it is unlikely that aberrant splicing of exon 11 or defective post-translational processing of prelamin A are involved in the pathogenesis of the disease.
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Affiliation(s)
- Yue-Bei Luo
- Centre for Neuromuscular and Neurological Disorders, Australian Neuro-Muscular Research Institute, University of Western AustraliaPerth, Australia
- Laboratory of Neuromuscular Disorders, Department of Neurology, Qilu Hospital, Shandong UniversityJinan, China
| | - Chalermchai Mitrpant
- Centre for Neuromuscular and Neurological Disorders, Australian Neuro-Muscular Research Institute, University of Western AustraliaPerth, Australia
- Department of Biochemistry, Faculty of Medicine, Siriraj Hospital, Mahidol UniversityBangkok, Thailand
| | - Russell Johnsen
- Centre for Neuromuscular and Neurological Disorders, Australian Neuro-Muscular Research Institute, University of Western AustraliaPerth, Australia
| | - Vicki Fabian
- Section of Neuropathology, Department of Anatomical Pathology, Royal Perth HospitalPerth, Australia
| | - Merrilee Needham
- Centre for Neuromuscular and Neurological Disorders, Australian Neuro-Muscular Research Institute, University of Western AustraliaPerth, Australia
| | - Sue Fletcher
- Centre for Neuromuscular and Neurological Disorders, Australian Neuro-Muscular Research Institute, University of Western AustraliaPerth, Australia
- Centre for Comparative Genomics, Murdoch UniversityPerth, Australia
| | - Steve D Wilton
- Centre for Neuromuscular and Neurological Disorders, Australian Neuro-Muscular Research Institute, University of Western AustraliaPerth, Australia
- Centre for Comparative Genomics, Murdoch UniversityPerth, Australia
| | - Frank L Mastaglia
- Centre for Neuromuscular and Neurological Disorders, Australian Neuro-Muscular Research Institute, University of Western AustraliaPerth, Australia
- Institute for Immunology & Infectious Diseases, Murdoch UniversityPerth, Australia
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Abstract
Lamins are nuclear intermediate filaments. In addition to their structural roles, they are implicated in basic nuclear functions such as chromatin organization, DNA replication, transcription, DNA repair, and cell-cycle progression. Mutations in human LMNA gene cause several diseases termed laminopathies. One of the laminopathic diseases is Hutchinson-Gilford progeria syndrome (HGPS), which is caused by a spontaneous mutation and characterized by premature aging. HGPS phenotypes share certain similarities with several apparently comparable medical conditions, such as aging and atherosclerosis, with the conspicuous absence of neuronal degeneration and cancer rarity during the short lifespan of the patients. Cell lines from HGPS patients are characterized by multiple nuclear defects, which include abnormal morphology, altered histone modification patterns, and increased DNA damage. These cell lines provide insight into the molecular pathways including senescence that require lamins A and B1. Here, we review recent data on HGPS phenotypes through the lens of transcriptional deregulation caused by lack of functional lamin A, progerin accumulation, and lamin B1 silencing.
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Affiliation(s)
- Miron Prokocimer
- Department of Genetics, Institute of Life Sciences, Hebrew University of Jerusalem, 91904, Jerusalem, Israel
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133
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Capanni C, Bruschi M, Columbaro M, Cuccarolo P, Ravera S, Dufour C, Candiano G, Petretto A, Degan P, Cappelli E. Changes in vimentin, lamin A/C and mitofilin induce aberrant cell organization in fibroblasts from Fanconi anemia complementation group A (FA-A) patients. Biochimie 2013; 95:1838-47. [PMID: 23831462 DOI: 10.1016/j.biochi.2013.06.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 06/21/2013] [Indexed: 01/03/2023]
Abstract
Growing number of publication has proved an increasing of cellular function of the Fanconi anemia proteins. To chromosome stability and DNA repair new roles have been attributed to FA proteins in oxidative stress response and homeostasis, immune response and cytokines sensibility, gene expression. Our work shows a new role for FA-A protein: the organization of the cellular structure. By 2D-PAGE of FA-A and correct fibroblasts treated and untreated with H2O2 we identify different expression of protein involved in the structural organization of nucleus, intermediate filaments and mitochondria. Immunofluorescence and electronic microscopy analysis clearly show an already altered cellular structure in normal culture condition and this worsted after oxidative stress. FA-A cell appears structurally prone to physiologic stress and this could explain part of the phenotype of FA cells.
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134
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Abstract
DNA methylation gradiently changes with age and is likely to be involved in aging-related processes with subsequent phenotype changes and increased susceptibility to certain diseases. The Hutchinson-Gilford Progeria (HGP) and Werner Syndrome (WS) are two premature aging diseases showing features of common natural aging early in life. Mutations in the LMNA and WRN genes were associated to disease onset; however, for a subset of patients the underlying causative mechanisms remain elusive. We aimed to evaluate the role of epigenetic alteration on premature aging diseases by performing comprehensive DNA methylation profiling of HGP and WS patients. We observed profound changes in the DNA methylation landscapes of WRN and LMNA mutant patients, which were narrowed down to a set of aging related genes and processes. Although of low overall variance, non-mutant patients revealed differential DNA methylation at distinct loci. Hence, we propose DNA methylation to have an impact on premature aging diseases.
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Affiliation(s)
- Holger Heyn
- Cancer Epigenetics and Biology Program (PEBC), Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Catalonia, Spain
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135
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Choi BH, Lee JS, Lee SH, Kim SC, Kim SW, Kim KS, Lee JH, Seong HH, Kim TH. Porcine LMNA Is a Positional Candidate Gene Associated with Growth and Fat Deposition. Asian-Australas J Anim Sci 2012; 25:1649-59. [PMID: 25049529 PMCID: PMC4094157 DOI: 10.5713/ajas.2012.12288] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 09/24/2012] [Accepted: 07/03/2012] [Indexed: 11/27/2022]
Abstract
Crosses between Korean and Landrace pigs have revealed a large quantitative trait loci (QTL) region for fat deposition in a region (89 cM) of porcine chromosome 4 (SSC4). To more finely map this QTL region and identify candidate genes for this trait, comparative mapping of pig and human chromosomes was performed in the present study. A region in the human genome that corresponds to the porcine QTL region was identified in HSA1q21. Furthermore, the LMNA gene, which is tightly associated with fat augmentation in humans, was localized to this region. Radiation hybrid (RH) mapping using a Sus scrofa RH panel localized LMNA to a region of 90.3 cM in the porcine genome, distinct from microsatellite marker S0214 (87.3 cM). Two-point analysis showed that LMNA was linked to S0214, SW1996, and S0073 on SSC4 with logarithm (base 10) of odds scores of 20.98, 17.78, and 16.73, respectively. To clone the porcine LMNA gene and to delineate the genomic structure and sequences, including the 3'untranslated region (UTR), rapid amplification of cDNA ends was performed. The coding sequence of porcine LMNA consisted of 1,719 bp, flanked by a 5'UTR and a 3'UTR. Two synonymous single nucleotide polymorphisms (SNPs) were identified in exons 3 and 7. Association tests showed that the SNP located in exon 3 (A193A) was significantly associated with weight at 30 wks (p<0.01) and crude fat content (p<0.05). This association suggests that SNPs located in LMNA could be used for marker-assisted selection in pigs.
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Affiliation(s)
- Bong Hwan Choi
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
| | - Jung Sim Lee
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
| | - Seung Hwan Lee
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
| | - Seung Chang Kim
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
| | - Sang Wook Kim
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
| | - Kwan Suk Kim
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
| | - Jun Heon Lee
- Division of Animal Science and Resources, College of Agriculture and Life Sciences Chungnam National University, Daejeon 305-764, Korea
| | - Hwan Hoo Seong
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
| | - Tae Hun Kim
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
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136
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van Rijsingen IAW, Bakker A, Azim D, Hermans-van Ast JF, van der Kooi AJ, van Tintelen JP, van den Berg MP, Christiaans I, Lekanne Dit Deprez RH, Wilde AAM, Zwinderman AH, Meijers JCM, Grootemaat AE, Nieuwland R, Pinto YM, Pinto-Sietsma SJ. Lamin A/C mutation is independently associated with an increased risk of arterial and venous thromboembolic complications. Int J Cardiol 2012; 168:472-7. [PMID: 23073275 DOI: 10.1016/j.ijcard.2012.09.118] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Revised: 09/10/2012] [Accepted: 09/22/2012] [Indexed: 11/15/2022]
Abstract
BACKGROUND Lamin A/C (LMNA) mutation carriers suffer from a variety of clinical phenotypes, including dilated cardiomyopathy (DCM). Although it has been suggested that carriers are at risk for thromboembolic complications, it is unknown whether this risk is higher than can be expected from the underlying cardiac abnormalities. The purpose of this study was to determine whether a LMNA mutation is associated with an increased risk of thromboembolic complications. METHODS We compared a cohort of 76 LMNA mutation carriers with a cohort of 224 idiopathic DCM patients without a LMNA mutation, with respect to the prevalence of arterial and venous thromboembolic complications. Furthermore, we carried out a case-control study to explore whether a prothrombotic phenotype was present in LMNA mutation carriers without DCM or atrial tachyarrhythmias (n=14) and compared this with mutation negative relatives (n=13). RESULTS The prevalence of thromboembolic complications was higher in the cohort of LMNA mutation carriers than in DCM patients (22 vs 11%; p<0.05), after respectively mean follow-up of 42 ± 12 and 49 ± 12 years. After adjustment for possible confounders, including atrial tachyarrhythmias and left ventricular ejection fraction, LMNA mutation carriership was independently associated with an increased risk of thromboembolic complications (HR 4.8, 95% CI: 2.2-10.6). The results of the case-control study suggested a prothrombotic phenotype in LMNA mutation carriers, as reflected by an altered platelet function and increased thrombin generation. CONCLUSIONS LMNA mutation is independently associated with an increased risk of arterial and venous thromboembolic complications. Laboratory research in LMNA mutation carriers without severe cardiac abnormalities suggests a prothrombotic phenotype.
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137
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Abstract
The cell nucleus communicates with the rest of the cell via nucleo/cytoplasmic transport of proteins and RNA through the nuclear pores. Direct mechanical links between the nucleus and the cytoplasm have recently emerged in the form of LINC (Linkers of the nucleoskeleton to the cytoskeleton) protein complexes. A LINC complex consists of four components. At its core are an inner nuclear membrane (INM) transmembrane protein and an outer nuclear membrane (ONM) transmembrane protein which physically interact with each other in the lumen of the NE. The INM LINC component interacts on the nucleoplasmic side with either the lamina or with an INM-associated protein. The ONM LINC component on the other hand contacts on the cytoplasmatic side a component of the cytoskeleton. This review highlights the components of LINC complexes and their emerging roles in mechanotransduction, nuclear migration, chromosome positioning, signaling, meiosis, cytoskeletal organization and human disease.
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Affiliation(s)
- Alexandre Méjat
- National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
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138
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Puckelwartz MJ, Depreux FF, McNally EM. Gene expression, chromosome position and lamin A/C mutations. Nucleus 2012; 2:162-7. [PMID: 21818408 DOI: 10.4161/nucl.2.3.16003] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Revised: 04/22/2011] [Accepted: 04/26/2011] [Indexed: 12/11/2022] Open
Abstract
The nuclear lamina is increasingly being appreciated for its epigenetic role in regulating gene expression. The nuclear lamina underlies the inner nuclear membrane and, in post mitotic cells, is composed of a latticework primarily formed by the intermediate filament protein, lamin A/C. Although not well defined, lamin-associated domains have been described, and these domains are determined by DNA sequence and chromatin conformation. Lamin-associated domains are positioned to mediate the interaction with the nuclear membrane, where they contribute to transcriptional regulation. Although lamin-associated domains are primarily considered to be repressive in nature, those nearer to nuclear pores may actually promote transcription. Mutations in LMNA, the gene encoding lamins A and C, are a relatively common cause of inherited cardiomyopathy. As substantial data supports a role for the lamina in its interaction with chromatin and gene regulation, we examined the role of a genetically disrupted lamina and the consequences thereof. A dominant LMNA mutation, E161K, that causes inherited cardiomyopathy was studied. Gene expression changes were profiled in a human cardiomyopathic E161K heart, and it was found that chromosome 13 had a high percentage of misexpressed genes. Chromosome 13 was also found to be less tightly associated with the nuclear membrane in E161K mutant cells, thereby linking abnormal gene expression and intranuclear position. These and other studies support a role for the nuclear membrane as an active regulator of gene expression and provide additional support that disrupting this regulation is a mechanism of human disease.
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139
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Kubben N, Voncken JW, Konings G, van Weeghel M, van den Hoogenhof MM, Gijbels M, van Erk A, Schoonderwoerd K, van den Bosch B, Dahlmans V, Calis C, Houten SM, Misteli T, Pinto YM. Post-natal myogenic and adipogenic developmental: defects and metabolic impairment upon loss of A-type lamins. Nucleus 2012; 2:195-207. [PMID: 21818413 DOI: 10.4161/nucl.2.3.15731] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 04/01/2011] [Accepted: 04/05/2011] [Indexed: 12/23/2022] Open
Abstract
A-type lamins are a major component of the nuclear lamina. Mutations in the LMNA gene, which encodes the A-type lamins A and C, cause a set of phenotypically diverse diseases collectively called laminopathies. While adult LMNA null mice show various symptoms typically associated with laminopathies, the effect of loss of lamin A/C on early post-natal development is poorly understood. Here we developed a novel LMNA null mouse (LMNA(GT-/-)) based on genetrap technology and analyzed its early post-natal development. We detect LMNA transcripts in heart, the outflow tract, dorsal aorta, liver and somites during early embryonic development. Loss of A-type lamins results in severe growth retardation and developmental defects of the heart, including impaired myocyte hypertrophy, skeletal muscle hypotrophy, decreased amounts of subcutaneous adipose tissue and impaired ex vivo adipogenic differentiation. These defects cause death at 2 to 3 weeks post partum associated with muscle weakness and metabolic complications, but without the occurrence of dilated cardiomyopathy or an obvious progeroid phenotype. Our results indicate that defective early post-natal development critically contributes to the disease phenotypes in adult laminopathies.
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Affiliation(s)
- Nard Kubben
- Heart Failure Research Center and Department of Cardiology, Maastricht University Medical Centre, The Netherlands
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140
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Abstract
Hutchinson-Gilford progeria syndrome (HGPS) is a rare condition originally described by Hutchinson in 1886. Death result from cardiac complications in the majority of cases and usually occurs at average age of thirteen years. A 4-yr old boy had typical clinical findings such as short stature, craniofacial disproportion, alopecia, prominent scalp veins and sclerodermatous skin. This abnormal appearance began at age of 1 yr. On serological and hormonal evaluation, all values are within normal range. He was neurologically intact with motor and mental development. An echocardiogram showed calcification of aortic and mitral valves. Hypertrophy of internal layer at internal carotid artery suggesting atherosclerosis was found by carotid doppler sonography. He is on low dose aspirin to prevent thromboembolic episodes and on regular follow up. Gene study showed typical G608G (GGC- > GGT) point mutation at exon 11 in LMNA gene. This is a rare case of Hutchinson-Gilford progeria syndrome confirmed by genetic analysis in Korea.
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Affiliation(s)
- Hui Kwon Kim
- Department of Pediatrics, College of Medicine, Hallym University, Chunchon, Korea
| | - Jong Yoon Lee
- Department of Pediatrics, College of Medicine, Hallym University, Chunchon, Korea
| | - Eun Ju Bae
- Department of Pediatrics, College of Medicine, Hallym University, Chunchon, Korea
| | - Phil Soo Oh
- Department of Pediatrics, College of Medicine, Hallym University, Chunchon, Korea
| | - Won Il Park
- Department of Pediatrics, College of Medicine, Hallym University, Chunchon, Korea
| | - Dong Sung Lee
- Department of Biochemistry and Molecular Biology, College of Medicine, Seoul National University, Seoul Korea
| | - Jong-Il Kim
- Department of Biochemistry and Molecular Biology, College of Medicine, Seoul National University, Seoul Korea
| | - Hong Jin Lee
- Department of Pediatrics, College of Medicine, Hallym University, Chunchon, Korea
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