1
|
Matter A, Kaufman C, Zürcher N, Lenggenhager D, Grehten P, Bartholdi D, Horka L, Häberle J, Makris G. LEMD2-associated progeroid syndrome: Expanding the phenotype of the nuclear envelopathy caused by a defect in LEMD2 gene. Aging Cell 2024:e14189. [PMID: 38757373 DOI: 10.1111/acel.14189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 03/27/2024] [Accepted: 04/19/2024] [Indexed: 05/18/2024] Open
Abstract
Nuclear envelopathies are rare genetic diseases that compromise the integrity of the nuclear envelope. Patients with a defect in LEM domain nuclear envelope protein 2 (LEMD2) leading to LEMD2-associated progeroid syndrome are exceedingly scarce in number, yet they exhibit shared clinical features including skeletal abnormalities and a prematurely-aged appearance. Our study broadens the understanding of LEMD2-associated progeroid syndrome by detailing its phenotypic and molecular characteristics in the first female and fourth reported case, highlighting a distinct impact on metabolic functions. The patient's history revealed growth delay, facial and skeletal abnormalities, and recurrent abdominal pain crises caused by hepatomegaly. Comparisons with the previously documented cases emphasized similarities in skeletal and facial features while showcasing unique variations, notably in cardiac and hepatic manifestations. In vitro experiments conducted on patient-derived peripheral blood and urinary epithelial cells and LEMD2-downregulated HepG2 cells confirmed abnormalities in the structure of the nuclear envelope in all three tissue-types. Overall, our work offers a comprehensive profile of a patient with LEMD2-related syndrome, emphasizing the hepatic involvement in the disease and broadening our understanding of clinical and molecular implications. This study not only contributes specific insights into LEMD2-related conditions but also underscores potential therapeutic paths for disorders affecting nuclear envelope dynamics.
Collapse
Affiliation(s)
- Alyssia Matter
- Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Christina Kaufman
- Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Nadia Zürcher
- Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Daniela Lenggenhager
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Patrice Grehten
- Department of Diagnostic Imaging, University Children's Hospital Zurich, Zurich, Switzerland
| | - Deborah Bartholdi
- Department of Human Genetics, Inselspital, Bern University Hospital, Bern, Switzerland
| | - Laura Horka
- Department of Endocrinology, Diabetology and Clinical Nutrition, University Hospital Zurich, Zurich, Switzerland
| | - Johannes Häberle
- Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Georgios Makris
- Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| |
Collapse
|
2
|
Elzamzami FD, Samal A, Arun AS, Dharmaraj T, Prasad NR, Rendon-Jonguitud A, DeVine L, Walston JD, Cole RN, Wilson KL. Native lamin A/C proteomes and novel partners from heart and skeletal muscle in a mouse chronic inflammation model of human frailty. Front Cell Dev Biol 2023; 11:1240285. [PMID: 37936983 PMCID: PMC10626543 DOI: 10.3389/fcell.2023.1240285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 10/05/2023] [Indexed: 11/09/2023] Open
Abstract
Clinical frailty affects ∼10% of people over age 65 and is studied in a chronically inflamed (Interleukin-10 knockout; "IL10-KO") mouse model. Frailty phenotypes overlap the spectrum of diseases ("laminopathies") caused by mutations in LMNA. LMNA encodes nuclear intermediate filament proteins lamin A and lamin C ("lamin A/C"), important for tissue-specific signaling, metabolism and chromatin regulation. We hypothesized that wildtype lamin A/C associations with tissue-specific partners are perturbed by chronic inflammation, potentially contributing to dysfunction in frailty. To test this idea we immunoprecipitated native lamin A/C and associated proteins from skeletal muscle, hearts and brains of old (21-22 months) IL10-KO versus control C57Bl/6 female mice, and labeled with Tandem Mass Tags for identification and quantitation by mass spectrometry. We identified 502 candidate lamin-binding proteins from skeletal muscle, and 340 from heart, including 62 proteins identified in both tissues. Candidates included frailty phenotype-relevant proteins Perm1 and Fam210a, and nuclear membrane protein Tmem38a, required for muscle-specific genome organization. These and most other candidates were unaffected by IL10-KO, but still important as potential lamin A/C-binding proteins in native heart or muscle. A subset of candidates (21 in skeletal muscle, 30 in heart) showed significantly different lamin A/C-association in an IL10-KO tissue (p < 0.05), including AldoA and Gins3 affected in heart, and Lmcd1 and Fabp4 affected in skeletal muscle. To screen for binding, eleven candidates plus prelamin A and emerin controls were arrayed as synthetic 20-mer peptides (7-residue stagger) and incubated with recombinant purified lamin A "tail" residues 385-646 under relatively stringent conditions. We detected strong lamin A binding to peptides solvent exposed in Lmcd1, AldoA, Perm1, and Tmem38a, and plausible binding to Csrp3 (muscle LIM protein). These results validated both proteomes as sources for native lamin A/C-binding proteins in heart and muscle, identified four candidate genes for Emery-Dreifuss muscular dystrophy (CSRP3, LMCD1, ALDOA, and PERM1), support a lamin A-interactive molecular role for Tmem38A, and supported the hypothesis that lamin A/C interactions with at least two partners (AldoA in heart, transcription factor Lmcd1 in muscle) are altered in the IL10-KO model of frailty.
Collapse
Affiliation(s)
- Fatima D. Elzamzami
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Arushi Samal
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Adith S. Arun
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Tejas Dharmaraj
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Neeti R. Prasad
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Alex Rendon-Jonguitud
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Lauren DeVine
- Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Jeremy D. Walston
- Division of Geriatric Medicine and Gerontology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Robert N. Cole
- Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Katherine L. Wilson
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| |
Collapse
|
3
|
Jebane C, Varlet AA, Karnat M, Hernandez- Cedillo LM, Lecchi A, Bedu F, Desgrouas C, Vigouroux C, Vantyghem MC, Viallat A, Rupprecht JF, Helfer E, Badens C. Enhanced cell viscosity: A new phenotype associated with lamin A/C alterations. iScience 2023; 26:107714. [PMID: 37701573 PMCID: PMC10494210 DOI: 10.1016/j.isci.2023.107714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 07/13/2023] [Accepted: 08/22/2023] [Indexed: 09/14/2023] Open
Abstract
Lamin A/C is a well-established key contributor to nuclear stiffness and its role in nucleus mechanical properties has been extensively studied. However, its impact on whole-cell mechanics has been poorly addressed, particularly concerning measurable physical parameters. In this study, we combined microfluidic experiments with theoretical analyses to quantitatively estimate the whole-cell mechanical properties. This allowed us to characterize the mechanical changes induced in cells by lamin A/C alterations and prelamin A accumulation resulting from atazanavir treatment or lipodystrophy-associated LMNA R482W pathogenic variant. Our results reveal a distinctive increase in long-time viscosity as a signature of cells affected by lamin A/C alterations. Furthermore, they show that the whole-cell response to mechanical stress is driven not only by the nucleus but also by the nucleo-cytoskeleton links and the microtubule network. The enhanced cell viscosity assessed with our microfluidic assay could serve as a valuable diagnosis marker for lamin-related diseases.
Collapse
Affiliation(s)
- Cécile Jebane
- Aix Marseille Univ, CNRS, CINAM, Turing Centre for Living Systems, Marseille, France
| | | | - Marc Karnat
- Aix Marseille Univ, Université de Toulon, CNRS, CPT, Turing Centre for Living Systems, Marseille, France
| | | | | | | | | | - Corinne Vigouroux
- Assistance Publique–Hôpitaux de Paris (AP-HP), Saint-Antoine Hospital, National Reference Centre for Rares diseases of Insulin-Secretion and Insulin-Sensitivity (PRISIS), Department of Endocrinology, Paris, France
- Sorbonne University, Saint-Antoine Research Centre, Inserm UMR_S938, Institute of Cardiometabolism and Nutrition, Paris, France
| | - Marie-Christine Vantyghem
- Endocrinology, Diabetology and Metabolism Department, Inserm U1190, EGID, Lille University Hospital, Lille, France
| | - Annie Viallat
- Aix Marseille Univ, CNRS, CINAM, Turing Centre for Living Systems, Marseille, France
| | - Jean-François Rupprecht
- Aix Marseille Univ, Université de Toulon, CNRS, CPT, Turing Centre for Living Systems, Marseille, France
| | - Emmanuèle Helfer
- Aix Marseille Univ, CNRS, CINAM, Turing Centre for Living Systems, Marseille, France
| | - Catherine Badens
- Aix Marseille Univ, INSERM, MMG, Marseille, France
- AP-HM, Laboratoire de Biochimie, Marseille, France
| |
Collapse
|
4
|
Palikaras K, Mari M, Ploumi C, Princz A, Filippidis G, Tavernarakis N. Age-dependent nuclear lipid droplet deposition is a cellular hallmark of aging in Caenorhabditis elegans. Aging Cell 2023; 22:e13788. [PMID: 36718841 PMCID: PMC10086520 DOI: 10.1111/acel.13788] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 01/11/2023] [Accepted: 01/12/2023] [Indexed: 02/01/2023] Open
Abstract
Aging is the major risk factor for several life-threatening pathologies and impairs the function of multiple cellular compartments and organelles. Age-dependent deterioration of nuclear morphology is a common feature in evolutionarily divergent organisms. Lipid droplets have been shown to localize in most nuclear compartments, where they impinge on genome architecture and integrity. However, the significance of progressive nuclear lipid accumulation and its impact on organismal homeostasis remain obscure. Here, we implement non-linear imaging modalities to monitor and quantify age-dependent nuclear lipid deposition in Caenorhabditis elegans. We find that lipid droplets increasingly accumulate in the nuclear envelope, during aging. Longevity-promoting interventions, such as low insulin signaling and caloric restriction, abolish the rate of nuclear lipid accrual and decrease the size of lipid droplets. Suppression of lipotoxic lipid accumulation in hypodermal and intestinal nuclei is dependent on the transcription factor HLH-30/TFEB and the triglyceride lipase ATGL-1. HLH-30 regulates the expression of ATGL-1 to reduce nuclear lipid droplet abundance in response to lifespan-extending conditions. Notably, ATGL-1 localizes to the nuclear envelope and moderates lipid content in long-lived mutant nematodes during aging. Our findings indicate that the reduced ATGL-1 activity leads to excessive nuclear lipid accumulation, perturbing nuclear homeostasis and undermining organismal physiology, during aging.
Collapse
Affiliation(s)
- Konstantinos Palikaras
- Department of Physiology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Meropi Mari
- Institute of Electronic Structure and Laser, Foundation for Research and Technology, Heraklion, Greece
| | - Christina Ploumi
- Institute of Molecular Biology and Biotechnology Foundation for Research and Technology, Heraklion, Greece.,Medical School, University of Crete, Heraklion, Greece
| | - Andrea Princz
- Institute of Molecular Biology and Biotechnology Foundation for Research and Technology, Heraklion, Greece
| | - George Filippidis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology, Heraklion, Greece
| | - Nektarios Tavernarakis
- Institute of Molecular Biology and Biotechnology Foundation for Research and Technology, Heraklion, Greece.,Medical School, University of Crete, Heraklion, Greece
| |
Collapse
|
5
|
Wei X, Murphy MA, Reddy NA, Hao Y, Eggertsen TG, Saucerman JJ, Bochkis IM. Redistribution of lamina-associated domains reshapes binding of pioneer factor FOXA2 in development of nonalcoholic fatty liver disease. Genome Res 2022; 32:1981-1992. [PMID: 36522168 PMCID: PMC9808618 DOI: 10.1101/gr.277149.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 11/16/2022] [Indexed: 12/23/2022]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is highly prevalent in type 2 diabetes mellitus and the elderly, impacting 40% of individuals over 70. Regulation of heterochromatin at the nuclear lamina has been associated with aging and age-dependent metabolic changes. We previously showed that changes at the lamina in aged hepatocytes and laminopathy models lead to redistribution of lamina-associated domains (LADs), opening of repressed chromatin, and up-regulation of genes regulating lipid synthesis and storage, culminating in fatty liver. Here, we test the hypothesis that change in the expression of lamina-associated proteins and nuclear shape leads to redistribution of LADs, followed by altered binding of pioneer factor FOXA2 and by up-regulation of lipid synthesis and storage, culminating in steatosis in younger NAFLD patients (aged 21-51). Changes in nuclear morphology alter LAD partitioning and reduced lamin B1 signal correlate with increased FOXA2 binding before severe steatosis in young mice placed on a western diet. Nuclear shape is also changed in younger NAFLD patients. LADs are redistrubted and lamin B1 signal decreases similarly in mild and severe steatosis. In contrast, FOXA2 binding is similar in normal and NAFLD patients with moderate steatosis and is repositioned only in NAFLD patients with more severe lipid accumulation. Hence, changes at the nuclear lamina reshape FOXA2 binding with progression of the disease. Our results suggest a role for nuclear lamina in etiology of NAFLD, irrespective of aging, with potential for improved stratification of patients and novel treatments aimed at restoring nuclear lamina function.
Collapse
Affiliation(s)
- Xiaolong Wei
- Department of Pharmacology, University of Virginia, Charlottesville, Virginia 22908, USA
| | - Megan A Murphy
- Department of Pharmacology, University of Virginia, Charlottesville, Virginia 22908, USA
| | - Nihal A Reddy
- Department of Pharmacology, University of Virginia, Charlottesville, Virginia 22908, USA
| | - Yi Hao
- Department of Pharmacology, University of Virginia, Charlottesville, Virginia 22908, USA
| | - Taylor G Eggertsen
- Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia 22908, USA
| | - Jeffrey J Saucerman
- Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia 22908, USA
| | - Irina M Bochkis
- Department of Pharmacology, University of Virginia, Charlottesville, Virginia 22908, USA
| |
Collapse
|
6
|
Gauthier BR, Comaills V. Nuclear Envelope Integrity in Health and Disease: Consequences on Genome Instability and Inflammation. Int J Mol Sci 2021; 22:ijms22147281. [PMID: 34298904 PMCID: PMC8307504 DOI: 10.3390/ijms22147281] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 07/02/2021] [Accepted: 07/04/2021] [Indexed: 12/11/2022] Open
Abstract
The dynamic nature of the nuclear envelope (NE) is often underestimated. The NE protects, regulates, and organizes the eukaryote genome and adapts to epigenetic changes and to its environment. The NE morphology is characterized by a wide range of diversity and abnormality such as invagination and blebbing, and it is a diagnostic factor for pathologies such as cancer. Recently, the micronuclei, a small nucleus that contains a full chromosome or a fragment thereof, has gained much attention. The NE of micronuclei is prone to collapse, leading to DNA release into the cytoplasm with consequences ranging from the activation of the cGAS/STING pathway, an innate immune response, to the creation of chromosomal instability. The discovery of those mechanisms has revolutionized the understanding of some inflammation-related diseases and the origin of complex chromosomal rearrangements, as observed during the initiation of tumorigenesis. Herein, we will highlight the complexity of the NE biology and discuss the clinical symptoms observed in NE-related diseases. The interplay between innate immunity, genomic instability, and nuclear envelope leakage could be a major focus in future years to explain a wide range of diseases and could lead to new classes of therapeutics.
Collapse
Affiliation(s)
- Benoit R. Gauthier
- Andalusian Center for Molecular Biology and Regenerative Medicine-CABIMER, Junta de Andalucía-University of Pablo de Olavide-University of Seville-CSIC, 41092 Seville, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain
- Correspondence: (B.R.G.); (V.C.)
| | - Valentine Comaills
- Andalusian Center for Molecular Biology and Regenerative Medicine-CABIMER, Junta de Andalucía-University of Pablo de Olavide-University of Seville-CSIC, 41092 Seville, Spain
- Correspondence: (B.R.G.); (V.C.)
| |
Collapse
|
7
|
Atalaia A, Ben Yaou R, Wahbi K, De Sandre-Giovannoli A, Vigouroux C, Bonne G. Laminopathies' Treatments Systematic Review: A Contribution Towards a 'Treatabolome'. J Neuromuscul Dis 2021; 8:419-439. [PMID: 33682723 PMCID: PMC8203247 DOI: 10.3233/jnd-200596] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
BACKGROUND Variants in the LMNA gene, encoding lamins A/C, are responsible for a growing number of diseases, all of which complying with the definition of rare diseases. LMNA-related disorders have a varied phenotypic expression with more than 15 syndromes described, belonging to five phenotypic groups: Muscular Dystrophies, Neuropathies, Cardiomyopathies, Lipodystrophies and Progeroid Syndromes. Overlapping phenotypes are also reported. Linking gene and variants with phenotypic expression, disease mechanisms, and corresponding treatments is particularly challenging in laminopathies. Treatment recommendations are limited, and very few are variant-based. OBJECTIVE The Treatabolome initiative aims to provide a shareable dataset of existing variant-specific treatment for rare diseases within the Solve-RD EU project. As part of this project, we gathered evidence of specific treatments for laminopathies via a systematic literature review adopting the FAIR (Findable, Accessible, Interoperable, and Reusable) guidelines for scientific data production. METHODS Treatments for LMNA-related conditions were systematically collected from MEDLINE and Embase bibliographic databases and clinical trial registries (Cochrane Central Registry of Controlled Trials, clinicaltrial.gov and EudraCT). Two investigators extracted and analyzed the literature data independently. The included papers were assessed using the Oxford Centre for Evidence-Based Medicine 2011 Levels of Evidence. RESULTS From the 4783 selected articles by a systematic approach, we identified 78 papers for our final analysis that corresponded to the profile of data defined in the inclusion and exclusion criteria. These papers include 2 guidelines/consensus papers, 4 meta-analyses, 14 single-arm trials, 15 case series, 13 cohort studies, 21 case reports, 8 expert reviews and 1 expert opinion. The treatments were summarized electronically according to significant phenome-genome associations. The specificity of treatments according to the different laminopathic phenotypical presentations is variable. CONCLUSIONS We have extracted Treatabolome-worthy treatment recommendations for patients with different forms of laminopathies based on significant phenome-genome parings. This dataset will be available on the Treatabolome website and, through interoperability, on genetic diagnosis and treatment support tools like the RD-Connect's Genome Phenome Analysis Platform.
Collapse
Affiliation(s)
- Antonio Atalaia
- Sorbonne Université, Inserm, Center of Research in Myology, G.H. Pitié-Salpêtrière, Paris, France
| | - Rabah Ben Yaou
- Sorbonne Université, Inserm, Center of Research in Myology, G.H. Pitié-Salpêtrière, Paris, France
- AP-HP Sorbonne Université, Neuromyology Department, Centre de référence maladies neuromusculaires Nord/Est/Ile-de-France (FILNEMUS network), Institut de Myologie, G.H. Pitié-Salpêtrière, Paris, France
| | - Karim Wahbi
- APHP, Cochin Hospital, Cardiology Department, FILNEMUS, Centre de Référence de Pathologie Neuromusculaire Nord/Est/Ile de France, Université de Paris, Paris, France
| | - Annachiara De Sandre-Giovannoli
- AP-HM, Department of Medical Genetics, and CRB-TAC (CRB AP-HM), Children’s Hospital La Timone, Marseille, France
- Aix Marseille University, Inserm, Marseille Medical Genetics Marseille, France
| | - Corinne Vigouroux
- AP-HP Saint-Antoine Hospital, Reference Centre of Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Departments of Molecular Biology and Genetics and of Endocrinology, 75012 Paris, France
- Sorbonne Université, Inserm, Saint-Antoine Research Center, Paris, France
| | - Gisèle Bonne
- Sorbonne Université, Inserm, Center of Research in Myology, G.H. Pitié-Salpêtrière, Paris, France
| |
Collapse
|
8
|
Wong X, Stewart CL. The Laminopathies and the Insights They Provide into the Structural and Functional Organization of the Nucleus. Annu Rev Genomics Hum Genet 2020; 21:263-288. [PMID: 32428417 DOI: 10.1146/annurev-genom-121219-083616] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In recent years, our perspective on the cell nucleus has evolved from the view that it is a passive but permeable storage organelle housing the cell's genetic material to an understanding that it is in fact a highly organized, integrative, and dynamic regulatory hub. In particular, the subcompartment at the nuclear periphery, comprising the nuclear envelope and the underlying lamina, is now known to be a critical nexus in the regulation of chromatin organization, transcriptional output, biochemical and mechanosignaling pathways, and, more recently, cytoskeletal organization. We review the various functional roles of the nuclear periphery and their deregulation in diseases of the nuclear envelope, specifically the laminopathies, which, despite their rarity, provide insights into contemporary health-care issues.
Collapse
Affiliation(s)
- Xianrong Wong
- Regenerative and Developmental Biology Group, Institute of Medical Biology, Singapore 138648; ,
| | - Colin L Stewart
- Regenerative and Developmental Biology Group, Institute of Medical Biology, Singapore 138648; ,
| |
Collapse
|
9
|
Kazlauskaite R, Janssen I, Wilson RS, Appelhans BM, Evans DA, Arvanitakis Z, El Khoudary SR, Kravitz HM. Is Midlife Metabolic Syndrome Associated With Cognitive Function Change? The Study of Women's Health Across the Nation. J Clin Endocrinol Metab 2020; 105:5735651. [PMID: 32083676 PMCID: PMC7059989 DOI: 10.1210/clinem/dgaa067] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 02/11/2020] [Indexed: 02/08/2023]
Abstract
CONTEXT Metabolic syndrome (MetS) affects cognitive function in late life, particularly in women. But longitudinal research is scarce on associations of MetS with cognitive function during midlife. OBJECTIVE To determine associations between MetS exposure and cognitive function trajectories in midlife women. DESIGN AND SETTING This is a 17-year prospective, longitudinal study of multiracial/ethnic women in 7 US communities, with annual/biennial assessments. PARTICIPANTS Participants were 2149 US women traversing menopause. EXPOSURE Exposure consisted of MetS assessments (median 4 assessments over 4 years). MAIN OUTCOME MEASURES Main outcome measures were assessments of cognitive function in 3 domains: perceptual speed (symbol digit modalities test, SDMT), episodic memory (East Boston Memory Test, EBMT), and working memory (Digit Span Backward Test, DSB). RESULTS By their first cognitive assessment (age 50.7 ± 2.9 years), 29.5% met the criteria for MetS. Women completed a median (interquartile range [IQR]) of 6 (IQR 4-7) follow-up cognitive assessments over 11.2 (IQR 9.2-11.5) years. Women with MetS, compared with those without, had a larger 10-year decline in SDMT z-score (estimate -0.087, 95% confidence interval, -0.150 to -0.024; P = 0.007), after adjustment for cognitive testing practice effects, sociodemographics, lifestyle, mood, and menopause factors. As such, MetS accelerated the 10-year loss of perceptual speed by 24%. MetS did not differentially affect the rate of decline in either immediate (P = 0.534) or delayed (P = 0.740) episodic memory or in working memory (P = 0.584). CONCLUSIONS In midlife women MetS exposure was associated with accelerated decline in perceptual speed, but not episodic or working memory.
Collapse
Affiliation(s)
- Rasa Kazlauskaite
- Department of Medicine, Rush University Medical Center, Chicago, Illinois
- Correspondence and Reprint Requests: Rasa Kazlauskaite, MD, Rush University Medical Center, 1750 W. Harrison St. (Jelke) Ste. 604w | Chicago, IL 60612. E-mail:
| | - Imke Janssen
- Department of Preventive Medicine, Rush University Medical Center, Chicago, Illinois
| | - Robert S Wilson
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois
- Department of Psychiatry and Behavioral Sciences, Rush University Medical Center, Chicago, Illinois
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois
| | - Bradley M Appelhans
- Department of Preventive Medicine, Rush University Medical Center, Chicago, Illinois
- Department of Psychiatry and Behavioral Sciences, Rush University Medical Center, Chicago, Illinois
| | - Denis A Evans
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois
| | - Zoe Arvanitakis
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois
| | - Samar R El Khoudary
- Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania
| | - Howard M Kravitz
- Department of Preventive Medicine, Rush University Medical Center, Chicago, Illinois
- Department of Psychiatry and Behavioral Sciences, Rush University Medical Center, Chicago, Illinois
| |
Collapse
|
10
|
Unraveling LMNA Mutations in Metabolic Syndrome: Cellular Phenotype and Clinical Pitfalls. Cells 2020; 9:cells9020310. [PMID: 32012908 PMCID: PMC7072715 DOI: 10.3390/cells9020310] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 01/20/2020] [Accepted: 01/25/2020] [Indexed: 12/13/2022] Open
Abstract
This study details the clinical and cellular phenotypes associated with two missense heterozygous mutations in LMNA, c.1745G>T p.(Arg582Leu), and c.1892G>A p.(Gly631Asp), in two patients with early onset of diabetes mellitus, hypertriglyceridemia and non-alcoholic fatty liver disease. In these two patients, subcutaneous adipose tissue was persistent, at least on the abdomen, and the serum leptin level remained in the normal range. Cellular studies showed elevated nuclear anomalies, an accelerated senescence rate and a decrease of replication capacity in patient cells. In cellular models, the overexpression of mutated prelamin A phenocopied misshapen nuclei, while the partial reduction of lamin A expression in patient cells significantly improved nuclear morphology. Altogether, these results suggest a link between lamin A mutant expression and senescence associated phenotypes. Transcriptome analysis of the whole subcutaneous adipose tissue from the two patients and three controls, paired for age and sex using RNA sequencing, showed the up regulation of genes implicated in immunity and the down regulation of genes involved in development and cell differentiation in patient adipose tissue. Therefore, our results suggest that some mutations in LMNA are associated with severe metabolic phenotypes without subcutaneous lipoatrophy, and are associated with nuclear misshaping.
Collapse
|
11
|
High prevalence of mutations in perilipin 1 in patients with precocious acute coronary syndrome. Atherosclerosis 2019; 293:86-91. [PMID: 31877397 DOI: 10.1016/j.atherosclerosis.2019.12.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 12/05/2019] [Accepted: 12/06/2019] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND AIMS Genetic partial lipodystrophies are rare heterogeneous disorders characterized by abnormalities of fat distribution and associated metabolic complications including a predisposition for atherosclerotic cardiovascular disease. We hypothesized that the milder forms of these diseases might be underdiagnosed and might result in early acute coronary syndrome (ACS) as the first sign of the pathology. METHODS We performed targeted sequencing on a panel of 8 genes involved in genetic lipodystrophy for 62 patients with premature ACS, and selected heterozygous missense variations with low frequency. To confirm those results, we analyzed a second independent group of 60 additional patients through Sanger sequencing, and compared to a control group of 120 healthy patients. RESULTS In the first cohort, only PLIN1 exhibited variants in more than 1 patient. In PLIN1, 3 different variants were found in 6 patients. We then analyzed PLIN1 sequence in the second cohort with premature ACS and found 2 other patients. Altogether, 8 patients were carriers of 4 different mutations in PLIN1. The variant frequencies in the total cohort of 122 patients were compared to frequencies observed in a local control cohort and in 2 different public databases showing a significant difference between patient vs control group frequencies for two mutations out of 4 (c.245C > T p = 10-4; c.839G > A p = 0.014). DISCUSSION This is the first study that identifies a high frequency of potential pathogenic mutations in PLIN1 related to early onset ACS. These findings could contribute to the prevention and care of precocious ACS in families carrying those mutations.
Collapse
|
12
|
Jéru I, Vantyghem MC, Bismuth E, Cervera P, Barraud S, Auclair M, Vatier C, Lascols O, Savage DB, Vigouroux C. Diagnostic Challenge in PLIN1-Associated Familial Partial Lipodystrophy. J Clin Endocrinol Metab 2019; 104:6025-6032. [PMID: 31504636 PMCID: PMC6916795 DOI: 10.1210/jc.2019-00849] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 06/20/2019] [Indexed: 12/22/2022]
Abstract
CONTEXT Heterozygous frameshift variants in PLIN1 encoding perilipin-1, a key protein for lipid droplet formation and triglyceride metabolism, have been implicated in familial partial lipodystrophy type 4 (FPLD4), a rare entity with only six families reported worldwide. The pathogenicity of other PLIN1 null variants identified in patients with diabetes and/or hyperinsulinemia was recently questioned because of the absence of lipodystrophy in these individuals and the elevated frequency of PLIN1 null variants in the general population. OBJECTIVES To reevaluate the pathogenicity of PLIN1 frameshift variants owing to new data obtained in the largest series of patients with FPLD4. METHODS We performed histological and molecular studies for patients referred to our French National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity for lipodystrophy and/or insulin resistance and carrying PLIN1 frameshift variants. RESULTS We identified two heterozygous PLIN1 frameshift variants segregating with the phenotype in nine patients from four unrelated families. The FPLD4 stereotypical signs included postpubertal partial lipoatrophy of variable severity, muscular hypertrophy, acromegaloid features, polycystic ovary syndrome and/or hirsutism, metabolic complications (e.g., hypertriglyceridemia, liver steatosis, insulin resistance, diabetes), and disorganized subcutaneous fat lobules with fibrosis and macrophage infiltration. CONCLUSIONS These data suggest that some FPLD4-associated PLIN1 variants are deleterious. Thus, the evidence for the pathogenicity of each variant ought to be carefully considered before genetic counseling, especially given the importance of an early diagnosis for optimal disease management. Thus, we recommend detailed familial investigation, adipose tissue-focused examination, and follow-up of metabolic evolution.
Collapse
Affiliation(s)
- Isabelle Jéru
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre and Institute of CardioMetabolism and Nutrition, Paris, France
- Department of Molecular Biology and Genetics, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France
| | - Marie-Christine Vantyghem
- Department of Endocrinology, Diabetology and Metabolism, Lille University Hospital, Lille, France
- Inserm U1190, European Genomic Institute for Diabetes, Lille, France
| | - Elise Bismuth
- Department of Pediatric Endocrinology and Diabetology, Competence Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity, Paris-Diderot University, Sorbonne Paris Cité, Assistance Publique-Hôpitaux de Paris, Robert Debré University Hospital, Paris, France
| | - Pascale Cervera
- Department of Pathology, Sorbonne University, Inserm U938, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France
| | - Sara Barraud
- Department of Endocrinology, Diabetes, Nutrition, Reims University Hospital, Reims, France
| | - Martine Auclair
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre and Institute of CardioMetabolism and Nutrition, Paris, France
| | - Camille Vatier
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre and Institute of CardioMetabolism and Nutrition, Paris, France
- Department of Endocrinology, Diabetology and Reproductive Endocrinology, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity, Assistance Publique Hopitaux de Paris, Saint Antoine University Hospital, Paris, France
| | - Olivier Lascols
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre and Institute of CardioMetabolism and Nutrition, Paris, France
- Department of Molecular Biology and Genetics, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France
| | - David B Savage
- Metabolic Research Libraries, University of Cambridge, Wellcome Trust-MRC Institute of Metabolic Science, Cambridge, United Kingdom
| | - Corinne Vigouroux
- Sorbonne University, Inserm U938, Saint-Antoine Research Centre and Institute of CardioMetabolism and Nutrition, Paris, France
- Department of Molecular Biology and Genetics, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France
- Department of Endocrinology, Diabetology and Reproductive Endocrinology, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity, Assistance Publique Hopitaux de Paris, Saint Antoine University Hospital, Paris, France
- Correspondence and Reprint Requests: Corinne Vigouroux, MD, PhD, Sorbonne Université Médecine, Site Saint-Antoine, 27, rue Chaligny, 75571 Paris Cédex 12, France. E-mail:
| |
Collapse
|
13
|
Dharmaraj T, Guan Y, Liu J, Badens C, Gaborit B, Wilson KL. Rare BANF1 Alleles and Relatively Frequent EMD Alleles Including 'Healthy Lipid' Emerin p.D149H in the ExAC Cohort. Front Cell Dev Biol 2019; 7:48. [PMID: 31024910 PMCID: PMC6459885 DOI: 10.3389/fcell.2019.00048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Accepted: 03/19/2019] [Indexed: 01/05/2023] Open
Abstract
Emerin (EMD) and barrier to autointegration factor 1 (BANF1) each bind A-type lamins (LMNA) as fundamental components of nuclear lamina structure. Mutations in LMNA, EMD and BANF1 are genetically linked to many tissue-specific disorders including Emery-Dreifuss muscular dystrophy and cardiomyopathy (LMNA, EMD), lipodystrophy, insulin resistance and type 2 diabetes (LMNA) and progeria (LMNA, BANF1). To explore human genetic variation in these genes, we analyzed EMD and BANF1 alleles in the Exome Aggregation Consortium (ExAC) cohort of 60,706 unrelated individuals. We identified 13 rare heterozygous BANF1 missense variants (p.T2S, p.H7Y, p.D9N, p.S22R, p.G25E, p.D55N, p.D57Y, p.L63P, p.N70T, p.K72R, p.R75W, p.R75Q, p.G79R), and one homozygous variant (p.D9H). Several variants are known (p.G25E) or predicted (e.g., p.D9H, p.D9N, p.L63P) to perturb BANF1 and warrant further study. Analysis of EMD revealed two previously identified variants associated with adult-onset cardiomyopathy (p.K37del, p.E35K) and one deemed 'benign' in an Emery-Dreifuss patient (p.D149H). Interestingly p.D149H was the most frequent emerin variant in ExAC, identified in 58 individuals (overall allele frequency 0.06645%), of whom 55 were East Asian (allele frequency 0.8297%). Furthermore, p.D149H associated with four 'healthy' traits: reduced triglycerides (-0.336; p = 0.0368), reduced waist circumference (-0.321; p = 0.0486), reduced cholesterol (-0.572; p = 0.000346) and reduced LDL cholesterol (-0.599; p = 0.000272). These traits are distinct from LMNA-associated metabolic disorders and provide the first insight that emerin influences metabolism. We also identified one novel in-frame deletion (p.F39del) and 62 novel emerin missense variants, many of which were relatively frequent and potentially disruptive including p.N91S and p.S143F (∼0.041% and ∼0.034% of non-Finnish Europeans, respectively), p.G156S (∼0.39% of Africans), p.R204G (∼0.18% of Latinx), p.R207P (∼0.08% of South Asians) and p.R221L (∼0.15% of Latinx). Many novel BANF1 variants are predicted to disrupt dimerization or binding to DNA, histones, emerin or A-type lamins. Many novel emerin variants are predicted to disrupt emerin filament dynamics or binding to BANF1, HDAC3, A-type lamins or other partners. These new human variants provide a foundational resource for future studies to test the molecular mechanisms of BANF1 and emerin function, and to understand the link between emerin variant p.D149H and a 'healthy' lipid profile.
Collapse
Affiliation(s)
- Tejas Dharmaraj
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Youchen Guan
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Julie Liu
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | | | | | - Katherine L Wilson
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| |
Collapse
|
14
|
Hussain I, Patni N, Garg A. Lipodystrophies, dyslipidaemias and atherosclerotic cardiovascular disease. Pathology 2019; 51:202-212. [PMID: 30595509 PMCID: PMC6402807 DOI: 10.1016/j.pathol.2018.11.004] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 11/01/2018] [Accepted: 11/04/2018] [Indexed: 01/09/2023]
Abstract
Lipodystrophies are rare, heterogeneous, genetic or acquired, disorders characterised by varying degrees of body fat loss and associated metabolic complications, including insulin resistance, dyslipidaemias, hepatic steatosis and predisposition to atherosclerotic cardiovascular disease (ASCVD). The four main types of lipodystrophy, excluding antiretroviral therapy-induced lipodystrophy in HIV-infected patients, are congenital generalised lipodystrophy (CGL), familial partial lipodystrophy (FPLD), acquired generalised lipodystrophy (AGL) and acquired partial lipodystrophy (APL). This paper reviews the literature related to the prevalence of dyslipidaemias and ASCVD in patients with lipodystrophies. Patients with CGL, AGL and FPLD have increased prevalence of dyslipidaemia but those with APL do not. Patients with CGL as well as AGL present in childhood, and have severe dyslipidaemias (mainly hypertriglyceridaemia) and early onset diabetes mellitus as a consequence of extreme fat loss. However, only a few patients with CGL and AGL have been reported to develop coronary heart disease. In contrast, data from some small cohorts of FPLD patients reveal increased prevalence of ASCVD especially among women. Patients with APL have a relatively low prevalence of hypertriglyceridaemia and diabetes mellitus. Overall, patients with lipodystrophies appear to be at high risk of ASCVD due to increased prevalence of dyslipidaemia and diabetes and efforts should be made to manage these metabolic complications aggressively to prevent ASCVD.
Collapse
Affiliation(s)
- Iram Hussain
- Division of Endocrinology, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX, USA
| | - Nivedita Patni
- Division of Pediatric Endocrinology, Department of Pediatrics, and Center for Human Nutrition, UT Southwestern Medical Center, Dallas, TX, USA
| | - Abhimanyu Garg
- Division of Nutrition and Metabolic Diseases, Department of Internal Medicine, Center for Human Nutrition, UT Southwestern Medical Center, Dallas, TX, USA.
| |
Collapse
|
15
|
Irisin levels in LMNA-associated partial lipodystrophies. DIABETES & METABOLISM 2019; 45:67-75. [DOI: 10.1016/j.diabet.2018.08.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 07/22/2018] [Accepted: 08/16/2018] [Indexed: 01/17/2023]
|
16
|
Spear ED, Hsu ET, Nie L, Carpenter EP, Hrycyna CA, Michaelis S. ZMPSTE24 missense mutations that cause progeroid diseases decrease prelamin A cleavage activity and/or protein stability. Dis Model Mech 2018; 11:dmm.033670. [PMID: 29794150 PMCID: PMC6078402 DOI: 10.1242/dmm.033670] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 05/16/2018] [Indexed: 12/24/2022] Open
Abstract
The human zinc metalloprotease ZMPSTE24 is an integral membrane protein crucial for the final step in the biogenesis of the nuclear scaffold protein lamin A, encoded by LMNA. After farnesylation and carboxyl methylation of its C-terminal CAAX motif, the lamin A precursor (prelamin A) undergoes proteolytic removal of its modified C-terminal 15 amino acids by ZMPSTE24. Mutations in LMNA or ZMPSTE24 that impede this prelamin A cleavage step cause the premature aging disease Hutchinson-Gilford progeria syndrome (HGPS), and the related progeroid disorders mandibuloacral dysplasia type B (MAD-B) and restrictive dermopathy (RD). Here, we report the development of a ‘humanized yeast system’ to assay ZMPSTE24-dependent cleavage of prelamin A and examine the eight known disease-associated ZMPSTE24 missense mutations. All mutations show diminished prelamin A processing and fall into three classes, with defects in activity, protein stability or both. Notably, some ZMPSTE24 mutants can be rescued by deleting the E3 ubiquitin ligase Doa10, involved in endoplasmic reticulum (ER)-associated degradation of misfolded membrane proteins, or by treatment with the proteasome inhibitor bortezomib. This finding may have important therapeutic implications for some patients. We also show that ZMPSTE24-mediated prelamin A cleavage can be uncoupled from the recently discovered role of ZMPSTE24 in clearance of ER membrane translocon-clogged substrates. Together with the crystal structure of ZMPSTE24, this humanized yeast system can guide structure-function studies to uncover mechanisms of prelamin A cleavage, translocon unclogging, and membrane protein folding and stability. Summary: The zinc metalloprotease ZMPSTE24 performs the final step of prelamin A processing. Here, a yeast-based system shows differences in protein stability and activity for alleles of ZMPSTE24 that cause progeria disease.
Collapse
Affiliation(s)
- Eric D Spear
- Department of Cell Biology, The Johns Hopkins School of Medicine, Baltimore, MD 21205, USA
| | - Erh-Ting Hsu
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Laiyin Nie
- Structural Genomics Consortium, University of Oxford, Oxford OX3 7DQ, UK
| | | | | | - Susan Michaelis
- Department of Cell Biology, The Johns Hopkins School of Medicine, Baltimore, MD 21205, USA
| |
Collapse
|
17
|
Smith ED, Garza-Gongora AG, MacQuarrie KL, Kosak ST. Interstitial telomeric loops and implications of the interaction between TRF2 and lamin A/C. Differentiation 2018; 102:19-26. [PMID: 29979997 DOI: 10.1016/j.diff.2018.06.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 06/11/2018] [Accepted: 06/12/2018] [Indexed: 11/19/2022]
Abstract
The protein-DNA complexes that compose the end of mammalian chromosomes-telomeres-serve to stabilize linear genomic DNA and are involved in cellular and organismal aging. One mechanism that protects telomeres from premature degradation is the formation of structures called t-loops, in which the single-stranded 3' overhang present at the terminal end of telomeres loops back and invades medial double-stranded telomeric DNA. We identified looped structures formed between terminal chromosome ends and interstitial telomeric sequences (ITSs), which are found throughout the human genome, that we have termed interstitial telomeric loops (ITLs). While they form in a TRF2-dependent manner similar to t-loops, ITLs further require the physical interaction of TRF2 with the nuclear intermediate filament protein lamin A/C. Our findings suggest that interactions between telomeres and the nucleoskeleton broadly impact genomic integrity, including telomere stability, chromosome structure, and chromosome fragility. Here, we review the roles of TRF2 and lamin A/C in telomere biology and consider how their interaction may relate telomere homeostasis to cellular and organismal aging.
Collapse
Affiliation(s)
- Erica D Smith
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Arturo G Garza-Gongora
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Kyle L MacQuarrie
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA; Division of Hematology, Oncology and Stem Cell Transplantation, Ann & Robert H. Lurie Children's Hospital of Chicago, USA
| | - Steven T Kosak
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
| |
Collapse
|
18
|
Simon DN, Wriston A, Fan Q, Shabanowitz J, Florwick A, Dharmaraj T, Peterson SB, Gruenbaum Y, Carlson CR, Grønning-Wang LM, Hunt DF, Wilson KL. OGT ( O-GlcNAc Transferase) Selectively Modifies Multiple Residues Unique to Lamin A. Cells 2018; 7:E44. [PMID: 29772801 PMCID: PMC5981268 DOI: 10.3390/cells7050044] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/11/2018] [Accepted: 05/14/2018] [Indexed: 12/31/2022] Open
Abstract
The LMNA gene encodes lamins A and C with key roles in nuclear structure, signaling, gene regulation, and genome integrity. Mutations in LMNA cause over 12 diseases ('laminopathies'). Lamins A and C are identical for their first 566 residues. However, they form separate filaments in vivo, with apparently distinct roles. We report that lamin A is β-O-linked N-acetylglucosamine-(O-GlcNAc)-modified in human hepatoma (Huh7) cells and in mouse liver. In vitro assays with purified O-GlcNAc transferase (OGT) enzyme showed robust O-GlcNAcylation of recombinant mature lamin A tails (residues 385⁻646), with no detectable modification of lamin B1, lamin C, or 'progerin' (Δ50) tails. Using mass spectrometry, we identified 11 O-GlcNAc sites in a 'sweet spot' unique to lamin A, with up to seven sugars per peptide. Most sites were unpredicted by current algorithms. Double-mutant (S612A/T643A) lamin A tails were still robustly O-GlcNAc-modified at seven sites. By contrast, O-GlcNAcylation was undetectable on tails bearing deletion Δ50, which causes Hutchinson⁻Gilford progeria syndrome, and greatly reduced by deletion Δ35. We conclude that residues deleted in progeria are required for substrate recognition and/or modification by OGT in vitro. Interestingly, deletion Δ35, which does not remove the majority of identified O-GlcNAc sites, does remove potential OGT-association motifs (lamin A residues 622⁻625 and 639⁻645) homologous to that in mouse Tet1. These biochemical results are significant because they identify a novel molecular pathway that may profoundly influence lamin A function. The hypothesis that lamin A is selectively regulated by OGT warrants future testing in vivo, along with two predictions: genetic variants may contribute to disease by perturbing OGT-dependent regulation, and nutrient or other stresses might cause OGT to misregulate wildtype lamin A.
Collapse
Affiliation(s)
- Dan N Simon
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA.
| | - Amanda Wriston
- Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA.
| | - Qiong Fan
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, 0317 Oslo, Norway.
| | - Jeffrey Shabanowitz
- Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA.
| | - Alyssa Florwick
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA.
| | - Tejas Dharmaraj
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA.
| | - Sherket B Peterson
- Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
| | - Yosef Gruenbaum
- Department of Genetics, Institute of Life Sciences, Hebrew University of Jerusalem, Givat Ram Jerusalem 91904, Israel.
| | - Cathrine R Carlson
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, 0450 Oslo, Norway.
| | - Line M Grønning-Wang
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, 0317 Oslo, Norway.
| | - Donald F Hunt
- Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA.
- Department of Pathology, University of Virginia, Charlottesville, VA 22904, USA.
| | - Katherine L Wilson
- Department of Cell Biology, Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA.
| |
Collapse
|
19
|
Brady GF, Kwan R, Cunha JB, Elenbaas JS, Omary MB. Lamins and Lamin-Associated Proteins in Gastrointestinal Health and Disease. Gastroenterology 2018; 154:1602-1619.e1. [PMID: 29549040 PMCID: PMC6038707 DOI: 10.1053/j.gastro.2018.03.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 03/04/2018] [Accepted: 03/06/2018] [Indexed: 02/07/2023]
Abstract
The nuclear lamina is a multi-protein lattice composed of A- and B-type lamins and their associated proteins. This protein lattice associates with heterochromatin and integral inner nuclear membrane proteins, providing links among the genome, nucleoskeleton, and cytoskeleton. In the 1990s, mutations in EMD and LMNA were linked to Emery-Dreifuss muscular dystrophy. Since then, the number of diseases attributed to nuclear lamina defects, including laminopathies and other disorders, has increased to include more than 20 distinct genetic syndromes. Studies of patients and mouse genetic models have pointed to important roles for lamins and their associated proteins in the function of gastrointestinal organs, including liver and pancreas. We review the interactions and functions of the lamina in relation to the nuclear envelope and genome, the ways in which its dysfunction is thought to contribute to human disease, and possible avenues for targeted therapies.
Collapse
Affiliation(s)
- Graham F. Brady
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan,Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan,To whom correspondence should be addressed: University of Michigan Medical School, Division of Gastroenterology, Department of Internal Medicine, 1137 Catherine St., Ann Arbor, MI 48109-5622.
| | - Raymond Kwan
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan
| | - Juliana Bragazzi Cunha
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan
| | - Jared S. Elenbaas
- Medical Scientist Training Program, Washington University, St Louis, Missouri
| | - M. Bishr Omary
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan,Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan,Ǻbo Akademi University, Turku, Finland
| |
Collapse
|
20
|
Brady GF, Kwan R, Ulintz PJ, Nguyen P, Bassirian S, Basrur V, Nesvizhskii AI, Loomba R, Omary MB. Nuclear lamina genetic variants, including a truncated LAP2, in twins and siblings with nonalcoholic fatty liver disease. Hepatology 2018; 67:1710-1725. [PMID: 28902428 PMCID: PMC5849478 DOI: 10.1002/hep.29522] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Revised: 08/15/2017] [Accepted: 09/07/2017] [Indexed: 01/03/2023]
Abstract
UNLABELLED Nonalcoholic fatty liver disease (NAFLD) is becoming the major chronic liver disease in many countries. Its pathogenesis is multifactorial, but twin and familial studies indicate significant heritability, which is not fully explained by currently known genetic susceptibility loci. Notably, mutations in genes encoding nuclear lamina proteins, including lamins, cause lipodystrophy syndromes that include NAFLD. We hypothesized that variants in lamina-associated proteins predispose to NAFLD and used a candidate gene-sequencing approach to test for variants in 10 nuclear lamina-related genes in a cohort of 37 twin and sibling pairs: 21 individuals with and 53 without NAFLD. Twelve heterozygous sequence variants were identified in four lamina-related genes (ZMPSTE24, TMPO, SREBF1, SREBF2). The majority of NAFLD patients (>90%) had at least one variant compared to <40% of controls (P < 0.0001). When only insertions/deletions and changes in conserved residues were considered, the difference between the groups was similarly striking (>80% versus <25%; P < 0.0001). Presence of a lamina variant segregated with NAFLD independently of the PNPLA3 I148M polymorphism. Several variants were found in TMPO, which encodes the lamina-associated polypeptide-2 (LAP2) that has not been associated with liver disease. One of these, a frameshift insertion that generates truncated LAP2, abrogated lamin-LAP2 binding, caused LAP2 mislocalization, altered endogenous lamin distribution, increased lipid droplet accumulation after oleic acid treatment in transfected cells, and led to cytoplasmic association with the ubiquitin-binding protein p62/SQSTM1. CONCLUSION Several variants in nuclear lamina-related genes were identified in a cohort of twins and siblings with NAFLD; one such variant, which results in a truncated LAP2 protein and a dramatic phenotype in cell culture, represents an association of TMPO/LAP2 variants with NAFLD and underscores the potential importance of the nuclear lamina in NAFLD. (Hepatology 2018;67:1710-1725).
Collapse
Affiliation(s)
- Graham F. Brady
- Department of Molecular and Integrative Physiology and Department of Internal Medicine, University of Michigan,To whom correspondence should be addressed: University of Michigan Medical School, Division of Gastroenterology, Department of Internal Medicine, 1137 Catherine St., Ann Arbor, MI 48109-5622.
| | - Raymond Kwan
- Department of Molecular and Integrative Physiology and Department of Internal Medicine, University of Michigan
| | - Peter J. Ulintz
- Department of Computational Medicine and Bioinformatics, University of Michigan
| | - Phirum Nguyen
- NAFLD Research Center, Division of Gastroenterology, Department of Medicine, University of California, San Diego
| | - Shirin Bassirian
- NAFLD Research Center, Division of Gastroenterology, Department of Medicine, University of California, San Diego
| | - Venkatesha Basrur
- Department of Computational Medicine and Bioinformatics, University of Michigan
| | - Alexey I. Nesvizhskii
- Department of Computational Medicine and Bioinformatics, University of Michigan,Department of Pathology, University of Michigan
| | - Rohit Loomba
- NAFLD Research Center, Division of Gastroenterology, Department of Medicine, University of California, San Diego
| | - M. Bishr Omary
- Department of Molecular and Integrative Physiology and Department of Internal Medicine, University of Michigan
| |
Collapse
|
21
|
Kim Y, Bayona PW, Kim M, Chang J, Hong S, Park Y, Budiman A, Kim YJ, Choi CY, Kim WS, Lee J, Cho KW. Macrophage Lamin A/C Regulates Inflammation and the Development of Obesity-Induced Insulin Resistance. Front Immunol 2018; 9:696. [PMID: 29731750 PMCID: PMC5920030 DOI: 10.3389/fimmu.2018.00696] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Accepted: 03/21/2018] [Indexed: 01/28/2023] Open
Abstract
Obesity-induced chronic low-grade inflammation, in particular in adipose tissue, contributes to the development of insulin resistance and type 2 diabetes. However, the mechanism by which obesity induces adipose tissue inflammation has not been completely elucidated. Recent studies suggest that alteration of the nuclear lamina is associated with age-associated chronic inflammation in humans and fly. These findings led us to investigate whether the nuclear lamina regulates obesity-mediated chronic inflammation. In this study, we show that lamin A/C mediates inflammation in macrophages. The gene and protein expression levels of lamin A/C are significantly increased in epididymal adipose tissues from obese rodent models and omental fat from obese human subjects compared to their lean controls. Flow cytometry and gene expression analyses reveal that the protein and gene expression levels of lamin A/C are increased in adipose tissue macrophages (ATMs) by obesity. We further show that ectopic overexpression of lamin A/C in macrophages spontaneously activates NF-κB, and increases the gene expression levels of proinflammatory genes, such as Il6, Tnf, Ccl2, and Nos2. Conversely, deletion of lamin A/C in macrophages reduces LPS-induced expression of these proinflammatory genes. Importantly, we find that myeloid cell-specific lamin A/C deficiency ameliorates obesity-induced insulin resistance and adipose tissue inflammation. Thus, our data suggest that lamin A/C mediates the activation of ATM inflammation by regulating NF-κB, thereby contributing to the development of obesity-induced insulin resistance.
Collapse
Affiliation(s)
- Youngjo Kim
- Soonchunhyang Institute of Medi-Bio Science (SIMS), Soonchunhyang University, Cheon-an, South Korea
| | - Princess Wendy Bayona
- Soonchunhyang Institute of Medi-Bio Science (SIMS), Soonchunhyang University, Cheon-an, South Korea
| | - Miri Kim
- Soonchunhyang Institute of Medi-Bio Science (SIMS), Soonchunhyang University, Cheon-an, South Korea
| | - Jiyeon Chang
- Soonchunhyang Institute of Medi-Bio Science (SIMS), Soonchunhyang University, Cheon-an, South Korea
| | - Sunmin Hong
- Soonchunhyang Institute of Medi-Bio Science (SIMS), Soonchunhyang University, Cheon-an, South Korea
| | - Yoona Park
- Soonchunhyang Institute of Medi-Bio Science (SIMS), Soonchunhyang University, Cheon-an, South Korea
| | - Andrea Budiman
- Soonchunhyang Institute of Medi-Bio Science (SIMS), Soonchunhyang University, Cheon-an, South Korea
| | - Yong-Jin Kim
- Department of Surgery, Soonchunhyang University Hospital, Seoul, South Korea
| | - Chang Yong Choi
- Department of Plastic and Reconstructive Surgery, Soonchunhyang University Hospital, Gumi, South Korea
| | - Woo Seok Kim
- Department of Surgery, Soonchunhyang University Gumi Hospital, Gumi, South Korea
| | - Jongsoon Lee
- The Joslin Diabetes Center, Department of Medicine, Harvard Medical School, Boston, MA, United States
| | - Kae Won Cho
- Soonchunhyang Institute of Medi-Bio Science (SIMS), Soonchunhyang University, Cheon-an, South Korea
| |
Collapse
|
22
|
Abstract
Insulin resistance and the metabolic syndrome are complex metabolic traits and key risk factors for the development of cardiovascular disease. They result from the interplay of environmental and genetic factors but the full extent of the genetic background to these conditions remains incomplete. Large-scale genome-wide association studies have helped advance the identification of common genetic variation associated with insulin resistance and the metabolic syndrome, and more recently, exome sequencing has allowed the identification of rare variants associated with the pathogenesis of these conditions. Many variants associated with insulin resistance are directly involved in glucose metabolism; however, functional studies are required to assess the contribution of other variants to the development of insulin resistance. Many genetic variants involved in the pathogenesis of the metabolic syndrome are associated with lipid metabolism.
Collapse
Affiliation(s)
- Audrey E Brown
- Institute of Cellular Medicine, William Leech Building, Medical School, Newcastle University, Newcastle, NE2 4HH, UK
| | - Mark Walker
- Institute of Cellular Medicine, William Leech Building, Medical School, Newcastle University, Newcastle, NE2 4HH, UK.
| |
Collapse
|
23
|
Hendrikx T, Schnabl B. Lamin Deficiency in the Liver Sets the Stage for Nonalcoholic Steatohepatitis Development in Males. Cell Mol Gastroenterol Hepatol 2017; 4:441-442. [PMID: 29062878 PMCID: PMC5650600 DOI: 10.1016/j.jcmgh.2017.09.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
| | - Bernd Schnabl
- Department of Medicine, University of California San Diego, La Jolla, California
| |
Collapse
|
24
|
de Leeuw R, Gruenbaum Y, Medalia O. Nuclear Lamins: Thin Filaments with Major Functions. Trends Cell Biol 2017; 28:34-45. [PMID: 28893461 DOI: 10.1016/j.tcb.2017.08.004] [Citation(s) in RCA: 196] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 08/08/2017] [Accepted: 08/14/2017] [Indexed: 10/18/2022]
Abstract
The nuclear lamina is a nuclear peripheral meshwork that is mainly composed of nuclear lamins, although a small fraction of lamins also localizes throughout the nucleoplasm. Lamins are classified as type V intermediate filament (IF) proteins. Mutations in lamin genes cause at least 15 distinct human diseases, collectively termed laminopathies, including muscle, metabolic, and neuronal diseases, and can cause accelerated aging. Most of these mutations are in the LMNA gene encoding A-type lamins. A growing number of nuclear proteins are known to bind lamins and are implicated in both nuclear and cytoskeletal organization, mechanical stability, chromatin organization, signaling, gene regulation, genome stability, and cell differentiation. Recent studies reveal the organization of the lamin filament meshwork in somatic cells where they assemble as tetramers in cross-section of the filaments.
Collapse
Affiliation(s)
- Rebecca de Leeuw
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Yosef Gruenbaum
- Department of Genetics, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ohad Medalia
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland; Department of Life Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University, Beer-Sheva 84105, Israel.
| |
Collapse
|
25
|
Lamins and metabolism. Clin Sci (Lond) 2017; 131:105-111. [PMID: 27974395 DOI: 10.1042/cs20160488] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 10/27/2016] [Accepted: 11/07/2016] [Indexed: 12/22/2022]
Abstract
Lamins are nuclear intermediate filaments (IFs) with important roles in most nuclear activities, including nuclear organization and cell-cycle progression. Mutations in human lamins cause over 17 different diseases, termed laminopathies. Most of these diseases are autosomal dominant and can be roughly divided into four major groups: muscle diseases, peripheral neuronal diseases, accelerated aging disorders and metabolic diseases including Dunnigan type familial partial lipodystrophy (FLPD), acquired partial lipodystrophy (APL) and autosomal dominant leucodystrophy. Mutations in lamins are also associated with the metabolic syndrome (MS). Cells derived from patients suffering from metabolic laminopathies, as well as cells derived from the corresponding animal models, show a disruption of the mechanistic target of rapamycin (mTOR) pathway, abnormal autophagy, altered proliferative rate and down-regulation of genes that regulate adipogenesis. In addition, treating Hutchinson-Gilford progeria syndrome (HGPS) cells with the mTOR inhibitor rapamycin improves their fate. In this review, we will discuss the ways by which lamin genes are involved in the regulation of cell metabolism.
Collapse
|
26
|
Florwick A, Dharmaraj T, Jurgens J, Valle D, Wilson KL. LMNA Sequences of 60,706 Unrelated Individuals Reveal 132 Novel Missense Variants in A-Type Lamins and Suggest a Link between Variant p.G602S and Type 2 Diabetes. Front Genet 2017; 8:79. [PMID: 28663758 PMCID: PMC5471320 DOI: 10.3389/fgene.2017.00079] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 05/29/2017] [Indexed: 12/18/2022] Open
Abstract
Mutations in LMNA, encoding nuclear intermediate filament proteins lamins A and C, cause multiple diseases ('laminopathies') including muscular dystrophy, dilated cardiomyopathy, familial partial lipodystrophy (FPLD2), insulin resistance syndrome and progeria. To assess the prevalence of LMNA missense mutations ('variants') in a broad, ethnically diverse population, we compared missense alleles found among 60,706 unrelated individuals in the ExAC cohort to those identified in 1,404 individuals in the laminopathy database (UMD-LMNA). We identified 169 variants in the ExAC cohort, of which 37 (∼22%) are disease-associated including p.I299V (allele frequency 0.0402%), p.G602S (allele frequency 0.0262%) and p.R644C (allele frequency 0.124%), suggesting certain LMNA mutations are more common than previously recognized. Independent analysis of LMNA variants via the type 2 diabetes (T2D) Knowledge Portal showed that variant p.G602S associated significantly with type 2 diabetes (p = 0.02; odds ratio = 4.58), and was more frequent in African Americans (allele frequency 0.297%). The FPLD2-associated variant I299V was most prevalent in Latinos (allele frequency 0.347%). The ExAC cohort also revealed 132 novel LMNA missense variants including p.K108E (limited to individuals with psychiatric disease; predicted to perturb coil-1B), p.R397C and p.R427C (predicted to perturb filament biogenesis), p.G638R and p.N660D (predicted to perturb prelamin A processing), and numerous Ig-fold variants predicted to perturb phenotypically characteristic protein-protein interactions. Overall, this two-pronged strategy- mining a large database for missense variants in a single gene (LMNA), coupled to knowledge about the structure, biogenesis and functions of A-type lamins- revealed an unexpected number of LMNA variants, including novel variants predicted to perturb lamin assembly or function. Interestingly, this study also correlated novel variant p.K108E with psychiatric disease, identified known variant p.I299V as a potential risk factor for metabolic disease in Latinos, linked variant p.G602 with type 2 diabetes, and identified p.G602S as a predictor of diabetes risk in African Americans.
Collapse
Affiliation(s)
- Alyssa Florwick
- Department of Cell Biology, Johns Hopkins University School of Medicine, BaltimoreMD, United States
| | - Tejas Dharmaraj
- Department of Cell Biology, Johns Hopkins University School of Medicine, BaltimoreMD, United States
| | - Julie Jurgens
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, BaltimoreMD, United States
| | - David Valle
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, BaltimoreMD, United States
| | - Katherine L. Wilson
- Department of Cell Biology, Johns Hopkins University School of Medicine, BaltimoreMD, United States
| |
Collapse
|
27
|
Torres MP, Dewhurst H, Sundararaman N. Proteome-wide Structural Analysis of PTM Hotspots Reveals Regulatory Elements Predicted to Impact Biological Function and Disease. Mol Cell Proteomics 2016; 15:3513-3528. [PMID: 27697855 PMCID: PMC5098047 DOI: 10.1074/mcp.m116.062331] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Indexed: 01/09/2023] Open
Abstract
Post-translational modifications (PTMs) regulate protein behavior through modulation of protein-protein interactions, enzymatic activity, and protein stability essential in the translation of genotype to phenotype in eukaryotes. Currently, less than 4% of all eukaryotic PTMs are reported to have biological function - a statistic that continues to decrease with an increasing rate of PTM detection. Previously, we developed SAPH-ire (Structural Analysis of PTM Hotspots) - a method for the prioritization of PTM function potential that has been used effectively to reveal novel PTM regulatory elements in discrete protein families (Dewhurst et al., 2015). Here, we apply SAPH-ire to the set of eukaryotic protein families containing experimental PTM and 3D structure data - capturing 1,325 protein families with 50,839 unique PTM sites organized into 31,747 modified alignment positions (MAPs), of which 2010 (∼6%) possess known biological function. Here, we show that using an artificial neural network model (SAPH-ire NN) trained to identify MAP hotspots with biological function results in prediction outcomes that far surpass the use of single hotspot features, including nearest neighbor PTM clustering methods. We find the greatest enhancement in prediction for positions with PTM counts of five or less, which represent 98% of all MAPs in the eukaryotic proteome and 90% of all MAPs found to have biological function. Analysis of the top 1092 MAP hotspots revealed 267 of truly unknown function (containing 5443 distinct PTMs). Of these, 165 hotspots could be mapped to human KEGG pathways for normal and/or disease physiology. Many high-ranking hotspots were also found to be disease-associated pathogenic sites of amino acid substitution despite the lack of observable PTM in the human protein family member. Taken together, these experiments demonstrate that the functional relevance of a PTM can be predicted very effectively by neural network models, revealing a large but testable body of potential regulatory elements that impact hundreds of different biological processes important in eukaryotic biology and human health.
Collapse
Affiliation(s)
- Matthew P Torres
- From the School of Biological Sciences; Georgia Institute of Technology; Atlanta, Georgia 30332
| | - Henry Dewhurst
- From the School of Biological Sciences; Georgia Institute of Technology; Atlanta, Georgia 30332
| | - Niveda Sundararaman
- From the School of Biological Sciences; Georgia Institute of Technology; Atlanta, Georgia 30332
| |
Collapse
|
28
|
A Heterozygous ZMPSTE24 Mutation Associated with Severe Metabolic Syndrome, Ectopic Fat Accumulation, and Dilated Cardiomyopathy. Cells 2016; 5:cells5020021. [PMID: 27120622 PMCID: PMC4931670 DOI: 10.3390/cells5020021] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 04/01/2016] [Accepted: 04/18/2016] [Indexed: 12/31/2022] Open
Abstract
ZMPSTE24 encodes the only metalloprotease, which transforms prelamin into mature lamin A. Up to now, mutations in ZMPSTE24 have been linked to Restrictive Dermopathy (RD), Progeria or Mandibulo-Acral Dysplasia (MAD). We report here the phenotype of a patient referred for severe metabolic syndrome and cardiomyopathy, carrying a mutation in ZMPSTE24. The patient presented with a partial lipodystrophic syndrome associating hypertriglyceridemia, early onset type 2 diabetes, and android obesity with truncal and abdominal fat accumulation but without subcutaneous lipoatrophy. Other clinical features included acanthosis nigricans, liver steatosis, dilated cardiomyopathy, and high myocardial and hepatic triglycerides content. Mutated fibroblasts from the patient showed increased nuclear shape abnormalities and premature senescence as demonstrated by a decreased Population Doubling Level, an increased beta-galactosidase activity and a decreased BrdU incorporation rate. Reduced prelamin A expression by siRNA targeted toward LMNA transcripts resulted in decreased nuclear anomalies. We show here that a central obesity without subcutaneous lipoatrophy is associated with a laminopathy due to a heterozygous missense mutation in ZMPSTE24. Given the high prevalence of metabolic syndrome and android obesity in the general population, and in the absence of familial study, the causative link between mutation and phenotype cannot be formally established. Nevertheless, altered lamina architecture observed in mutated fibroblasts are responsible for premature cellular senescence and could contribute to the phenotype observed in this patient.
Collapse
|
29
|
Lipodystrophies: adipose tissue disorders with severe metabolic implications. J Physiol Biochem 2015; 71:471-8. [DOI: 10.1007/s13105-015-0404-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 03/18/2015] [Indexed: 01/06/2023]
|
30
|
Andre P, Schneebeli S, Vigouroux C, Lascols O, Schaaf M, Chevalier P. Metabolic and cardiac phenotype characterization in 37 atypical Dunnigan patients with nonfarnesylated mutated prelamin A. Am Heart J 2015; 169:587-93. [PMID: 25819867 DOI: 10.1016/j.ahj.2014.12.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 12/02/2014] [Indexed: 10/24/2022]
Abstract
BACKGROUND Laminopathies are associated with a broad spectrum of clinical manifestations, from lipodystrophy to cardiac diseases. The purpose of this study was to assess genotype-phenotype correlations in a lipodystrophic laminopathy caused by the Lamin A (LMNA) mutation T655fsX49. This mutation leads to synthesis of nonfarnesylated-mutated prelamin A that does not undergo the physiologic lamin A maturation process. METHODS AND RESULTS We studied 35 patients originating from Reunion Island who carried the LMNA T655fsX49 mutation. Comparisons of cardiac and endocrinologic features were made between homozygous and heterozygous patients. Homozygous patients presented more overlapping syndromes with severe cardiac phenotypes, defined by cardiolaminopathy, early atheroma with coronary heart disease (CHD) and high-degree conduction disorder compared with heterozygous (40% vs 4%; P = .016). Moreover, homozygous patients had earlier onset (49.6 vs 66 years old; P = .0002). Left ventricle lowered ejection fraction associated with heart failure was more frequent in homozygous than in heterozygous patients (40% vs 0%, respectively). Lipodystrophic traits were more marked in the homozygous group but only reached statistical significance for L4 subcutaneous fat measurement (2.8 ± 2.16 vs 18.7 ± 8.9 mm; P = .008) and leptin levels (2.45 ± 1.6 vs 11.26 ± 7.2 ng/mL; P = .0001). CONCLUSIONS Our results suggest that there is a relationship between mutated prelamin-A accumulation and the severity of the phenotypes in homozygous familial partial lipodystrophy type 2 patients who harbor the LMNA T655fsX49 mutation. A dose-dependent effect seems likely.
Collapse
|
31
|
Prelamin A accumulation in endothelial cells induces premature senescence and functional impairment. Atherosclerosis 2014; 237:45-52. [PMID: 25200614 DOI: 10.1016/j.atherosclerosis.2014.08.036] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 07/17/2014] [Accepted: 08/19/2014] [Indexed: 01/06/2023]
Abstract
BACKGROUND Defects in lamin A maturation result in premature aging syndromes and severe atherosclerosis as observed in the Hutchinson-Gilford Progeria Syndrome. In age-related atherosclerosis, several features of cellular senescence have been characterized in endothelial cells including telomere shortening and increased oxidative stress. However, to date, very little is known about lamin A alterations in these cells. OBJECTIVES To study lamin A-related senescence and its consequences in the activation status of primary endothelial cells. METHODS Healthy primary endothelial cells and progenitors issued from human umbilical vein or cord blood were used. Lamin A defects were induced by protease inhibitor (Atazanavir) treatment for 48 h. RESULTS We show that protease inhibitor treatment leads to the accumulation of farnesylated prelamin A, inducing nuclear shape abnormalities and premature senescence in both differentiated and progenitor endothelial cells. ICAM-1-dependent activation and monocytes adhesion was increased in mature endothelial cells. In parallel, the ability to generate microvascular networks in matrigel was decreased for endothelial progenitors. The effects of protease inhibitor treatment on nuclear shapes were reversed when cells were treated in combination with Pravastatin and Zoledronate in both mature and progenitor endothelial cells. Reversion was also demonstrated with a morpholino antisense-oligonucleotide targeting lamin A-specific splice site. DISCUSSION This study shows that protease inhibitor treatment reproduces premature senescence due to lamin A defects in primary endothelial cells and progenitors after 48 h exposure. The cells used were non-aged as extracted from cord blood or umbilical vein, allowing one to consider that other senescence pathways were not activated and that the observed alterations were specific of prelamin A accumulation. Both mature endothelial cells and precursors were sensitive to prelamin accumulation and thus, could be used in the future as a valuable model to test different approaches aimed at specifically reversing lamin A-related cells senescence.
Collapse
|
32
|
Navarro CL, Esteves-Vieira V, Courrier S, Boyer A, Duong Nguyen T, Huong LTT, Meinke P, Schröder W, Cormier-Daire V, Sznajer Y, Amor DJ, Lagerstedt K, Biervliet M, van den Akker PC, Cau P, Roll P, Lévy N, Badens C, Wehnert M, De Sandre-Giovannoli A. New ZMPSTE24 (FACE1) mutations in patients affected with restrictive dermopathy or related progeroid syndromes and mutation update. Eur J Hum Genet 2014; 22:1002-11. [PMID: 24169522 PMCID: PMC4350588 DOI: 10.1038/ejhg.2013.258] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 09/20/2013] [Accepted: 09/27/2013] [Indexed: 01/24/2023] Open
Abstract
Restrictive dermopathy (RD) is a rare and extremely severe congenital genodermatosis, characterized by a tight rigid skin with erosions at flexure sites, multiple joint contractures, low bone density and pulmonary insufficiency generally leading to death in the perinatal period. RD is caused in most patients by compound heterozygous or homozygous ZMPSTE24 null mutations. This gene encodes a metalloprotease specifically involved in lamin A post-translational processing. Here, we report a total of 16 families for whom diagnosis and molecular defects were clearly established. Among them, we report seven new ZMPSTE24 mutations, identified in classical RD or Mandibulo-acral dysplasia (MAD) affected patients. We also report nine families with one or two affected children carrying the common, homozygous thymine insertion in exon 9 and demonstrate the lack of a founder effect. In addition, we describe several new ZMPSTE24 variants identified in unaffected controls or in patients affected with non-classical progeroid syndromes. In addition, this mutation update includes a comprehensive search of the literature on previously described ZMPSTE24 mutations and associated phenotypes. Our comprehensive analysis of the molecular pathology supported the general rule: complete loss-of-function of ZMPSTE24 leads to RD, whereas other less severe phenotypes are associated with at least one haploinsufficient allele.
Collapse
Affiliation(s)
- Claire Laure Navarro
- Inserm, UMR_S 910, Marseille, France
- Aix Marseille Université, GMGF, Marseille, France
| | - Vera Esteves-Vieira
- Laboratory of Molecular Genetics, Medical Genetics Department, La Timone Children's Hospital, Marseille, France
| | - Sébastien Courrier
- Inserm, UMR_S 910, Marseille, France
- Aix Marseille Université, GMGF, Marseille, France
| | - Amandine Boyer
- Laboratory of Molecular Genetics, Medical Genetics Department, La Timone Children's Hospital, Marseille, France
| | - Thuy Duong Nguyen
- Institute of Human Genetics and Interfaculty Institute of Genetics and Functional Genomics, Department of University Medicine, Ernst-Moritz-Arndt University, Greifswald, Germany
- Institute of Genome Research (IGR), Vietnam Academy of Science and Technology (VAST), Hà Nô̇i, Vietnam
| | - Le Thi Thanh Huong
- Institute of Human Genetics and Interfaculty Institute of Genetics and Functional Genomics, Department of University Medicine, Ernst-Moritz-Arndt University, Greifswald, Germany
- National Institute of Hygiene and Epidemiology, Hà Nô̇i, Vietnam
| | - Peter Meinke
- Institute of Human Genetics and Interfaculty Institute of Genetics and Functional Genomics, Department of University Medicine, Ernst-Moritz-Arndt University, Greifswald, Germany
| | - Winnie Schröder
- Institute of Human Genetics and Interfaculty Institute of Genetics and Functional Genomics, Department of University Medicine, Ernst-Moritz-Arndt University, Greifswald, Germany
| | | | - Yves Sznajer
- Center for Human Genetics, Cliniques Universitaires St-Luc, U.C.L, Bruxelles, Belgique
| | - David J Amor
- Murdoch Childrens Research Institute, Royal Children's Hospital, Parkville, VIC, Australia
| | - Kristina Lagerstedt
- Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden
| | - Martine Biervliet
- Department of Medical Genetics, University Hospital Antwerp, Antwerp, Belgium
| | - Peter C van den Akker
- Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Pierre Cau
- Inserm, UMR_S 910, Marseille, France
- Aix Marseille Université, GMGF, Marseille, France
- Laboratory of Cellular Biology, Medical Genetics Department, La Timone Children's Hospital, Marseille, France
| | - Patrice Roll
- Inserm, UMR_S 910, Marseille, France
- Aix Marseille Université, GMGF, Marseille, France
- Laboratory of Cellular Biology, Medical Genetics Department, La Timone Children's Hospital, Marseille, France
| | - Nicolas Lévy
- Inserm, UMR_S 910, Marseille, France
- Aix Marseille Université, GMGF, Marseille, France
- Laboratory of Molecular Genetics, Medical Genetics Department, La Timone Children's Hospital, Marseille, France
| | - Catherine Badens
- Inserm, UMR_S 910, Marseille, France
- Aix Marseille Université, GMGF, Marseille, France
- Laboratory of Molecular Genetics, Medical Genetics Department, La Timone Children's Hospital, Marseille, France
| | - Manfred Wehnert
- Institute of Human Genetics and Interfaculty Institute of Genetics and Functional Genomics, Department of University Medicine, Ernst-Moritz-Arndt University, Greifswald, Germany
| | - Annachiara De Sandre-Giovannoli
- Inserm, UMR_S 910, Marseille, France
- Aix Marseille Université, GMGF, Marseille, France
- Laboratory of Molecular Genetics, Medical Genetics Department, La Timone Children's Hospital, Marseille, France
| |
Collapse
|
33
|
Nuclear envelope-related lipodystrophies. Semin Cell Dev Biol 2014; 29:148-57. [DOI: 10.1016/j.semcdb.2013.12.015] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 12/06/2013] [Accepted: 12/20/2013] [Indexed: 12/12/2022]
|
34
|
Yang L, Munck M, Swaminathan K, Kapinos LE, Noegel AA, Neumann S. Mutations in LMNA modulate the lamin A--Nesprin-2 interaction and cause LINC complex alterations. PLoS One 2013; 8:e71850. [PMID: 23977161 PMCID: PMC3748058 DOI: 10.1371/journal.pone.0071850] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 07/03/2013] [Indexed: 11/29/2022] Open
Abstract
Background In eukaryotes the genetic material is enclosed by a continuous membrane system, the nuclear envelope (NE). Along the NE specific proteins assemble to form meshworks and mutations in these proteins have been described in a group of human diseases called laminopathies. Laminopathies include lipodystrophies, muscle and cardiac diseases as well as metabolic or progeroid syndromes. Most laminopathies are caused by mutations in the LMNAgene encoding lamins A/C. Together with Nesprins (Nuclear Envelope Spectrin Repeat Proteins) they are core components of the LINC complex (Linker of Nucleoskeleton and Cytoskeleton). The LINC complex connects the nucleoskeleton and the cytoskeleton and plays a role in the transfer of mechanically induced signals along the NE into the nucleus, and its components have been attributed functions in maintaining nuclear and cellular organization as well as signal transduction. Results Here we narrowed down the interaction sites between lamin A and Nesprin-2 to aa 403–425 in lamin A and aa 6146–6347 in Nesprin-2. Laminopathic mutations in and around the involved region of lamin A (R401C, G411D, G413C, V415I, R419C, L421P, R427G, Q432X) modulate the interaction with Nesprin-2 and this may contribute to the disease phenotype. The most notable mutation is the lamin A mutation Q432X that alters LINC complex protein assemblies and causes chromosomal and transcription factor rearrangements. Conclusion Mutations in Nesprin-2 and lamin A are characterised by complex genotype phenotype relations. Our data show that each mutation in LMNAanalysed here has a distinct impact on the interaction among both proteins that substantially explains how distinct mutations in widely expressed genes lead to the formation of phenotypically different diseases.
Collapse
Affiliation(s)
- Liu Yang
- Institute for Biochemistry I, Medical Faculty, University of Cologne, and Center for Molecular Medicine Cologne (CMMC) and Cologne Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Medical Faculty, University of Cologne, Cologne, Germany
| | - Martina Munck
- Institute for Biochemistry I, Medical Faculty, University of Cologne, and Center for Molecular Medicine Cologne (CMMC) and Cologne Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Medical Faculty, University of Cologne, Cologne, Germany
| | - Karthic Swaminathan
- Institute for Biochemistry I, Medical Faculty, University of Cologne, and Center for Molecular Medicine Cologne (CMMC) and Cologne Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Medical Faculty, University of Cologne, Cologne, Germany
| | - Larisa E. Kapinos
- Biozentrum and the Nanoscience Institute, University of Basel, Basel, Switzerland
| | - Angelika A. Noegel
- Institute for Biochemistry I, Medical Faculty, University of Cologne, and Center for Molecular Medicine Cologne (CMMC) and Cologne Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Medical Faculty, University of Cologne, Cologne, Germany
- * E-mail: (AAN); (SN)
| | - Sascha Neumann
- Institute for Biochemistry I, Medical Faculty, University of Cologne, and Center for Molecular Medicine Cologne (CMMC) and Cologne Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), Medical Faculty, University of Cologne, Cologne, Germany
- * E-mail: (AAN); (SN)
| |
Collapse
|
35
|
Affiliation(s)
- Kristina I Rother
- Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA.
| | | |
Collapse
|
36
|
Quigley A, Dong YY, Pike ACW, Dong L, Shrestha L, Berridge G, Stansfeld PJ, Sansom MSP, Edwards AM, Bountra C, von Delft F, Bullock AN, Burgess-Brown NA, Carpenter EP. The structural basis of ZMPSTE24-dependent laminopathies. Science 2013; 339:1604-7. [PMID: 23539603 DOI: 10.1126/science.1231513] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Mutations in the nuclear membrane zinc metalloprotease ZMPSTE24 lead to diseases of lamin processing (laminopathies), such as the premature aging disease progeria and metabolic disorders. ZMPSTE24 processes prelamin A, a component of the nuclear lamina intermediate filaments, by cleaving it at two sites. Failure of this processing results in accumulation of farnesylated, membrane-associated prelamin A. The 3.4 angstrom crystal structure of human ZMPSTE24 has a seven transmembrane α-helical barrel structure, surrounding a large, water-filled, intramembrane chamber, capped by a zinc metalloprotease domain with the catalytic site facing into the chamber. The 3.8 angstrom structure of a complex with a CSIM tetrapeptide showed that the mode of binding of the substrate resembles that of an insect metalloprotease inhibitor in thermolysin. Laminopathy-associated mutations predicted to reduce ZMPSTE24 activity map to the zinc metalloprotease peptide-binding site and to the bottom of the chamber.
Collapse
Affiliation(s)
- Andrew Quigley
- Structural Genomics Consortium, University of Oxford, Oxford, UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Perrin S, Cremer J, Faucher O, Reynes J, Dellamonica P, Micallef J, Solas C, Lacarelle B, Stretti C, Kaspi E, Robaglia-Schlupp A, Tamalet CNBC, Lévy N, Poizot-Martin I, Cau P, Roll P. HIV protease inhibitors do not cause the accumulation of prelamin A in PBMCs from patients receiving first line therapy: the ANRS EP45 "aging" study. PLoS One 2012; 7:e53035. [PMID: 23285253 PMCID: PMC3532351 DOI: 10.1371/journal.pone.0053035] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 11/22/2012] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND The ANRS EP45 "Aging" study investigates the cellular mechanisms involved in the accelerated aging of HIV-1 infected and treated patients. The present report focuses on lamin A processing, a pathway known to be altered in systemic genetic progeroid syndromes. METHODS 35 HIV-1 infected patients being treated with first line antiretroviral therapy (ART, mean duration at inclusion: 2.7±1.3 years) containing boosted protease inhibitors (PI/r) (comprising lopinavir/ritonavir in 65% of patients) were recruited together with 49 seronegative age- and sex-matched control subjects (http://clinicaltrials.gov/, NCT01038999). In more than 88% of patients, the viral load was <40 copies/ml and the CD4+ cell count was >500/mm³. Prelamin A processing in peripheral blood mononuclear cells (PBMCs) from patients and controls was analysed by western blotting at inclusion. PBMCs from patients were also investigated at 12 and 24 months after enrolment in the study. PBMCs from healthy controls were also incubated with boosted lopinavir in culture medium containing various concentrations of proteins (4 to 80 g/L). RESULTS Lamin A precursor was not observed in cohort patient PBMC regardless of the PI/r used, the dose and the plasma concentration. Prelamin A was detected in PBMC incubated in culture medium containing a low protein concentration (4 g/L) but not in plasma (60-80 g/L) or in medium supplemented with BSA (40 g/L), both of which contain a high protein concentration. CONCLUSIONS Prelamin A processing abnormalities were not observed in PBMCs from patients under the PI/r first line regimen. Therefore, PI/r do not appear to contribute to lamin A-related aging in PBMCs. In cultured PBMCs from healthy donors, prelamin A processing abnormalities were only observed when the protein concentration in the culture medium was low, thus increasing the amount of PI available to enter cells. ClinicalTrials.gov NCT01038999 http://clinicaltrials.gov/ct2/show/NCT01038999.
Collapse
Affiliation(s)
- Sophie Perrin
- Inserm UMR_S 910, Aix-Marseille Université, Marseille, France
- Laboratoire de Biologie Cellulaire, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
| | - Jonathan Cremer
- Inserm UMR_S 910, Aix-Marseille Université, Marseille, France
- Laboratoire de Biologie Cellulaire, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
| | - Olivia Faucher
- Service d’Immuno-Hématologie Clinique, Centre Hospitalier Universitaire (CHU) Sainte Marguerite Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
| | - Jacques Reynes
- Département des Maladies Infectieuses et Tropicales, Centre Hospitalier Régional et Universitaire (CHRU) Gui-de-Chauliac, Montpellier, France
| | - Pierre Dellamonica
- Service d’Infectiologie, Centre Hospitalier Universitaire (CHU) L’Archet 1, Sophia-Antipolis Université, Nice, France
| | - Joëlle Micallef
- Centre d’Investigation Clinique - Unité de Pharmacologie Clinique et d’Evaluations Thérapeutiques (CIC-UPCET), Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
| | - Caroline Solas
- Laboratoire de Pharmacocinétique et de Toxicologie, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
- Inserm UMR_S 911, Aix-Marseille Université, Marseille, France
| | - Bruno Lacarelle
- Laboratoire de Pharmacocinétique et de Toxicologie, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
- Inserm UMR_S 911, Aix-Marseille Université, Marseille, France
| | - Charlotte Stretti
- Inserm UMR_S 910, Aix-Marseille Université, Marseille, France
- Laboratoire de Biologie Cellulaire, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
| | - Elise Kaspi
- Inserm UMR_S 910, Aix-Marseille Université, Marseille, France
- Laboratoire de Biologie Cellulaire, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
| | - Andrée Robaglia-Schlupp
- Inserm UMR_S 910, Aix-Marseille Université, Marseille, France
- Laboratoire de Biologie Cellulaire, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
| | | | - Nicolas Lévy
- Inserm UMR_S 910, Aix-Marseille Université, Marseille, France
- Laboratoire de Génetique Moléculaire, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
| | - Isabelle Poizot-Martin
- Département des Maladies Infectieuses et Tropicales, Centre Hospitalier Régional et Universitaire (CHRU) Gui-de-Chauliac, Montpellier, France
| | - Pierre Cau
- Inserm UMR_S 910, Aix-Marseille Université, Marseille, France
- Laboratoire de Biologie Cellulaire, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
| | - Patrice Roll
- Inserm UMR_S 910, Aix-Marseille Université, Marseille, France
- Laboratoire de Biologie Cellulaire, Centre Hospitalier Universitaire (CHU) La Timone Assistance Publique des Hôpitaux de Marseille (APHM), Marseille, France
- * E-mail:
| |
Collapse
|
38
|
Simon DN, Domaradzki T, Hofmann WA, Wilson KL. Lamin A tail modification by SUMO1 is disrupted by familial partial lipodystrophy-causing mutations. Mol Biol Cell 2012; 24:342-50. [PMID: 23243001 PMCID: PMC3564541 DOI: 10.1091/mbc.e12-07-0527] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Lamin A tail domains are SUMO1 modified at K420 (nuclear localization signal) and K486 (Ig-fold). K486 modification requires Ig-fold surface residues E460 and D461 and is reduced by familial partial lipodystrophy–causing mutations G465D and K486N. These results suggest novel mechanisms of functional control over lamin A in cells. Lamin filaments are major components of the nucleoskeleton that bind LINC complexes and many nuclear membrane proteins. The tail domain of lamin A directly binds 21 known partners, including actin, emerin, and SREBP1, but how these interactions are regulated is unknown. We report small ubiquitin-like modifier 1 (SUMO1) as a major new posttranslational modification of the lamin A tail. Two SUMO1 modification sites were identified based on in vitro SUMOylation assays and studies of Cos-7 cells. One site (K420) matches the SUMO1 target consensus; the other (K486) does not. On the basis of the position of K486 on the lamin A Ig-fold, we hypothesize the SUMO1 E2 enzyme recognizes a folded structure–dependent motif that includes residues genetically linked to familial partial lipodystrophy (FPLD). Supporting this model, SUMO1-modification of the lamin A tail is reduced by two FPLD-causing mutations, G465D and K486N, and by single mutations in acidic residues E460 and D461. These results suggest a novel mode of functional control over lamin A in cells.
Collapse
Affiliation(s)
- Dan N Simon
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | | | | | | |
Collapse
|
39
|
Boudreau É, Labib S, Bertrand AT, Decostre V, Bolongo PM, Sylvius N, Bonne G, Tesson F. Lamin A/C mutants disturb sumo1 localization and sumoylation in vitro and in vivo. PLoS One 2012; 7:e45918. [PMID: 23029315 PMCID: PMC3448699 DOI: 10.1371/journal.pone.0045918] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Accepted: 08/23/2012] [Indexed: 11/18/2022] Open
Abstract
A-type lamins A and C are nuclear intermediate filament proteins in which mutations have been implicated in multiple disease phenotypes commonly known as laminopathies. A few studies have implicated sumoylation in the regulation of A-type lamins. Sumoylation is a post-translational protein modification that regulates a wide range of cellular processes through the attachment of small ubiquitin-related modifier (sumo) to various substrates. Here we showed that laminopathy mutants result in the mislocalization of sumo1 both in vitro (C2C12 cells overexpressing mutant lamins A and C) and in vivo (primary myoblasts and myopathic muscle tissue from the Lmna(H222P/H222P) mouse model). In C2C12 cells, we showed that the trapping of sumo1 in p.Asp192Gly, p.Gln353Lys, and p.Arg386Lys aggregates of lamin A/C correlated with an increased steady-state level of sumoylation. However, lamin A and C did not appear to be modified by sumo1. Our results suggest that mutant lamin A/C alters the dynamics of sumo1 and thus misregulation of sumoylation may be contributing to disease progression in laminopathies.
Collapse
Affiliation(s)
- Émilie Boudreau
- Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | - Sarah Labib
- Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | - Anne T. Bertrand
- UMRS 974, Inserm, Paris, France
- Université Pierre et Marie Curie-Paris Institut de Myologie, Paris, France
| | - Valérie Decostre
- UMRS 974, Inserm, Paris, France
- Université Pierre et Marie Curie-Paris Institut de Myologie, Paris, France
| | - Pierrette M. Bolongo
- Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | - Nicolas Sylvius
- Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | - Gisèle Bonne
- UMRS 974, Inserm, Paris, France
- Université Pierre et Marie Curie-Paris Institut de Myologie, Paris, France
- Service de Biochimie Métabolique, U.F. Cardiogénétique et Myogénétique, AP-HP Groupe Hospitalier Pitié-Salpêtrière, Paris, France
| | - Frédérique Tesson
- Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada
| |
Collapse
|
40
|
Lamine C2 et spermatogenèse. Basic Clin Androl 2012. [DOI: 10.1007/s12610-012-0188-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Résumé
Les lamines A/C sont des filaments intermédiaires présents dans les noyaux des cellules. Leurs rôles sont multiples et des mutations du gène LMNA sont à l’origine de nombreuses maladies appelées laminopathies. Dans les cellules germinales masculines, cette famille de protéines n’est représentée que par la lamine C2. Les données obtenues chez la souris démontrent l’importance de ces filaments dans le déroulement de la méiose masculine et présagent de l’existence d’un nouveau domaine d’infertilité d’origine masculine lié à des mutations de ce filament intermédiaire ou de ses protéines associées.
Collapse
|
41
|
Barrowman J, Wiley PA, Hudon-Miller SE, Hrycyna CA, Michaelis S. Human ZMPSTE24 disease mutations: residual proteolytic activity correlates with disease severity. Hum Mol Genet 2012; 21:4084-93. [PMID: 22718200 DOI: 10.1093/hmg/dds233] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The zinc metalloprotease ZMPSTE24 plays a critical role in nuclear lamin biology by cleaving the prenylated and carboxylmethylated 15-amino acid tail from the C-terminus of prelamin A to yield mature lamin A. A defect in this proteolytic event, caused by a mutation in the lamin A gene (LMNA) that eliminates the ZMPSTE24 cleavage site, underlies the premature aging disease Hutchinson-Gilford Progeria Syndrome (HGPS). Likewise, mutations in the ZMPSTE24 gene that result in decreased enzyme function cause a spectrum of diseases that share certain features of premature aging. Twenty human ZMPSTE24 alleles have been identified that are associated with three disease categories of increasing severity: mandibuloacral dysplasia type B (MAD-B), severe progeria (atypical 'HGPS') and restrictive dermopathy (RD). To determine whether a correlation exists between decreasing ZMPSTE24 protease activity and increasing disease severity, we expressed mutant alleles of ZMPSTE24 in yeast and optimized in vivo yeast mating assays to directly compare the activity of alleles associated with each disease category. We also measured the activity of yeast crude membranes containing the ZMPSTE24 mutant proteins in vitro. We determined that, in general, the residual activity of ZMPSTE24 patient alleles correlates with disease severity. Complete loss-of-function alleles are associated with RD, whereas retention of partial, measureable activity results in MAD-B or severe progeria. Importantly, our assays can discriminate small differences in activity among the mutants, confirming that the methods presented here will be useful for characterizing any new ZMPSTE24 mutations that are discovered.
Collapse
Affiliation(s)
- Jemima Barrowman
- Department of Cell Biology, The Johns Hopkins School of Medicine, Baltimore, MD 21205, USA
| | | | | | | | | |
Collapse
|
42
|
Barrowman J, Hamblet C, Kane MS, Michaelis S. Requirements for efficient proteolytic cleavage of prelamin A by ZMPSTE24. PLoS One 2012; 7:e32120. [PMID: 22355414 PMCID: PMC3280227 DOI: 10.1371/journal.pone.0032120] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Accepted: 01/19/2012] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND The proteolytic maturation of the nuclear protein lamin A by the zinc metalloprotease ZMPSTE24 is critical for human health. The lamin A precursor, prelamin A, undergoes a multi-step maturation process that includes CAAX processing (farnesylation, proteolysis and carboxylmethylation of the C-terminal CAAX motif), followed by ZMPSTE24-mediated cleavage of the last 15 amino acids, including the modified C-terminus. Failure to cleave the prelamin A "tail", due to mutations in either prelamin A or ZMPSTE24, results in a permanently prenylated form of prelamin A that underlies the premature aging disease Hutchinson-Gilford Progeria Syndrome (HGPS) and related progeroid disorders. METHODOLOGY/PRINCIPAL FINDINGS Here we have investigated the features of the prelamin A substrate that are required for efficient cleavage by ZMPSTE24. We find that the C-terminal 41 amino acids of prelamin A contain sufficient context to allow cleavage of the tail by ZMPSTE24. We have identified several mutations in amino acids immediately surrounding the cleavage site (between Y646 and L647) that interfere with efficient cleavage of the prelamin A tail; these mutations include R644C, L648A and N650A, in addition to the previously reported L647R. Our data suggests that 9 of the 15 residues within the cleaved tail that lie immediately upstream of the CAAX motif are not critical for ZMPSTE24-mediated cleavage, as they can be replaced by the 9 amino acid HA epitope. However, duplication of the same 9 amino acids (to increase the distance between the prenyl group and the cleavage site) impairs the ability of ZMPSTE24 to cleave prelamin A. CONCLUSIONS/SIGNIFICANCE Our data reveals amino acid preferences flanking the ZMPSTE24 cleavage site of prelamin A and suggests that spacing from the farnesyl-cysteine to the cleavage site is important for optimal ZMPSTE24 cleavage. These studies begin to elucidate the substrate requirements of an enzyme activity critical to human health and longevity.
Collapse
Affiliation(s)
- Jemima Barrowman
- Department of Cell Biology, The Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America
| | - Corinne Hamblet
- Department of Cell Biology, The Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America
| | - Megan S. Kane
- Department of Cell Biology, The Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America
| | - Susan Michaelis
- Department of Cell Biology, The Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America
- * E-mail:
| |
Collapse
|
43
|
Inner nuclear membrane proteins: impact on human disease. Chromosoma 2012; 121:153-67. [DOI: 10.1007/s00412-012-0360-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Revised: 01/02/2012] [Accepted: 01/03/2012] [Indexed: 02/01/2023]
|
44
|
Worman HJ. Nuclear lamins and laminopathies. J Pathol 2011; 226:316-25. [PMID: 21953297 DOI: 10.1002/path.2999] [Citation(s) in RCA: 271] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Revised: 09/01/2011] [Accepted: 09/15/2011] [Indexed: 12/31/2022]
Abstract
Nuclear lamins are intermediate filament proteins that polymerize to form the nuclear lamina on the inner aspect of the inner nuclear membrane. Long known to be essential for maintaining nuclear structure and disassembling/reassembling during mitosis in metazoans, research over the past dozen years has shown that mutations in genes encoding nuclear lamins, particularly LMNA encoding the A-type lamins, cause a broad range of diverse diseases, often referred to as laminopathies. Lamins are expressed in all mammalian somatic cells but mutations in their genes lead to relatively tissue-selective disease phenotypes in most cases. While mutations causing laminopathies have been shown to produce abnormalities in nuclear morphology, how these disease-causing mutations or resultant alterations in nuclear structure lead to pathology is only starting to be understood. Despite the incomplete understanding of pathogenic mechanisms underlying the laminopathies, basic research in cellular and small animal models has produced promising leads for treatments of these rare diseases.
Collapse
Affiliation(s)
- Howard J Worman
- Departments of Medicine and of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, USA.
| |
Collapse
|