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Wilke MVMB, Wick M, Schwab TL, Starosta RT, Clark KJ, Connolly HM, Klee EW. Nuclear Abnormalities in LMNA p.(Glu2Lys) Variant Segregating with LMNA-Associated Cardiocutaneous Progeria Syndrome. Genes (Basel) 2024; 15:112. [PMID: 38255001 PMCID: PMC10815864 DOI: 10.3390/genes15010112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/10/2024] [Accepted: 01/15/2024] [Indexed: 01/24/2024] Open
Abstract
The LMNA gene encodes lamin A and lamin C, which play important roles in nuclear organization. Pathogenic variants in LMNA cause laminopathies, a group of disorders with diverse phenotypes. There are two main groups of disease-causing variants: missense variants affecting dimerization and intermolecular interactions, and heterozygous substitutions activating cryptic splice sites. These variants lead to different disorders, such as dilated cardiomyopathy and Hutchinson-Gilford progeria (HGP). Among these, the phenotypic terms for LMNA-associated cardiocutaneous progeria syndrome (LCPS), which does not alter lamin A processing and has an older age of onset, have been described. Here, we present the workup of an LMNA variant of uncertain significance, NM_170707.2 c. 4G>A, p.(Glu2Lys), in a 36-year-old female with severe calcific aortic stenosis, a calcified mitral valve, premature aging, and a family history of similar symptoms. Due to the uncertainty of in silico predictions for this variant, an assessment of nuclear morphology was performed using the immunocytochemistry of stable cell lines to indicate whether the p.(Glu2Lys) had a similar pathogenic mechanism as a previously described pathogenic variant associated with LCPS, p.Asp300Gly. Indirect immunofluorescence analysis of nuclei from stable cell lines showed abnormal morphology, including lobulation and occasional ringed nuclei. Relative to the controls, p.Glu2Lys and p.Asp300Gly nuclei had significantly (p < 0.001) smaller average nuclear areas than controls (mean = 0.10 units, SD = 0.06 for p.Glu2Lys; and mean = 0.09 units, SD = 0.05 for p.Asp300Gly versus mean = 0.12, SD = 0.05 for WT). After functional studies and segregation studies, this variant was upgraded to likely pathogenic. In summary, our findings suggest that p.Glu2Lys impacts nuclear morphology in a manner comparable to what was observed in p.Asp300Gly cells, indicating that the variant is the likely cause of the LCPS segregating within this family.
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Affiliation(s)
| | - Myra Wick
- Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, MN 55905, USA;
- Department of Clinical Genomics, Mayo Clinic, Rochester, MN 55905, USA
| | - Tanya L. Schwab
- Department of Molecular Hematology, Mayo Clinic, Rochester, MN 55905, USA
| | - Rodrigo Tzovenos Starosta
- Division of Medical Genetics and Genomics, Washington University in Saint Louis, Saint Louis, MO 63130, USA;
- Graduate Program in Gastroenterology and Hepatology, Universidade Federal do Rio Grande do Sul, Porto Alegre 90610-000, Brazil
| | - Karl J. Clark
- Department of Biochemical and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA
| | | | - Eric W. Klee
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN 55905, USA;
- Department of Clinical Genomics, Mayo Clinic, Rochester, MN 55905, USA
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN 55905, USA
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Quintana‐Torres D, Valle‐Cao A, Bousquets‐Muñoz P, Freitas‐Rodríguez S, Rodríguez F, Lucia A, López‐Otín C, López‐Soto A, Folgueras AR. The secretome atlas of two mouse models of progeria. Aging Cell 2023; 22:e13952. [PMID: 37565451 PMCID: PMC10577534 DOI: 10.1111/acel.13952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 07/21/2023] [Accepted: 07/25/2023] [Indexed: 08/12/2023] Open
Abstract
Hutchinson-Gilford progeria syndrome (HGPS) is a rare genetic disease caused by nuclear envelope alterations that lead to accelerated aging and premature death. Several studies have linked health and longevity to cell-extrinsic mechanisms, highlighting the relevance of circulating factors in the aging process as well as in age-related diseases. We performed a global plasma proteomic analysis in two preclinical progeroid models (LmnaG609G/G609G and Zmpste24-/- mice) using aptamer-based proteomic technology. Pathways related to the extracellular matrix, growth factor response and calcium ion binding were among the most enriched in the proteomic signature of progeroid samples compared to controls. Despite the global downregulation trend found in the plasma proteome of progeroid mice, several proteins associated with cardiovascular disease, the main cause of death in HGPS, were upregulated. We also developed a chronological age predictor using plasma proteome data from a cohort of healthy mice (aged 1-30 months), that reported an age acceleration when applied to progeroid mice, indicating that these mice exhibit an "old" plasma proteomic signature. Furthermore, when compared to naturally-aged mice, a great proportion of differentially expressed circulating proteins in progeroid mice were specific to premature aging, highlighting secretome-associated differences between physiological and accelerated aging. This is the first large-scale profiling of the plasma proteome in progeroid mice, which provides an extensive list of candidate circulating plasma proteins as potential biomarkers and/or therapeutic targets for further exploration and hypothesis generation in the context of both physiological and premature aging.
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Affiliation(s)
- Diego Quintana‐Torres
- Departamento de Bioquímica y Biología Molecular, Facultad de MedicinaInstituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de OviedoOviedoSpain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA)OviedoSpain
| | - Alejandra Valle‐Cao
- Departamento de Bioquímica y Biología Molecular, Facultad de MedicinaInstituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de OviedoOviedoSpain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA)OviedoSpain
| | - Pablo Bousquets‐Muñoz
- Departamento de Bioquímica y Biología Molecular, Facultad de MedicinaInstituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de OviedoOviedoSpain
| | - Sandra Freitas‐Rodríguez
- Departamento de Bioquímica y Biología Molecular, Facultad de MedicinaInstituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de OviedoOviedoSpain
| | - Francisco Rodríguez
- Departamento de Bioquímica y Biología Molecular, Facultad de MedicinaInstituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de OviedoOviedoSpain
| | - Alejandro Lucia
- CIBER of Frailty and Healthy Aging (CIBERFES) and Instituto de Investigación 12 de Octubre (i+12)MadridSpain
- Faculty of Sport SciencesUniversidad EuropeaMadridSpain
| | - Carlos López‐Otín
- Departamento de Bioquímica y Biología Molecular, Facultad de MedicinaInstituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de OviedoOviedoSpain
| | - Alejandro López‐Soto
- Departamento de Bioquímica y Biología Molecular, Facultad de MedicinaInstituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de OviedoOviedoSpain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA)OviedoSpain
| | - Alicia R. Folgueras
- Departamento de Bioquímica y Biología Molecular, Facultad de MedicinaInstituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de OviedoOviedoSpain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA)OviedoSpain
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Pande S, Ghosh DK. Nuclear proteostasis imbalance in laminopathy-associated premature aging diseases. FASEB J 2023; 37:e23116. [PMID: 37498235 DOI: 10.1096/fj.202300878r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 06/15/2023] [Accepted: 07/13/2023] [Indexed: 07/28/2023]
Abstract
Laminopathies are a group of rare genetic disorders with heterogeneous clinical phenotypes such as premature aging, cardiomyopathy, lipodystrophy, muscular dystrophy, microcephaly, epilepsy, and so on. The cellular phenomena associated with laminopathy invariably show disruption of nucleoskeleton of lamina due to deregulated expression, localization, function, and interaction of mutant lamin proteins. Impaired spatial and temporal tethering of lamin proteins to the lamina or nucleoplasmic aggregation of lamins are the primary molecular events that can trigger nuclear proteotoxicity by modulating differential protein-protein interactions, sequestering quality control proteins, and initiating a cascade of abnormal post-translational modifications. Clearly, laminopathic cells exhibit moderate to high nuclear proteotoxicity, raising the question of whether an imbalance in nuclear proteostasis is involved in laminopathic diseases, particularly in diseases of early aging such as HGPS and laminopathy-associated premature aging. Here, we review nuclear proteostasis and its deregulation in the context of lamin proteins and laminopathies.
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Affiliation(s)
- Shruti Pande
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India
| | - Debasish Kumar Ghosh
- Enteric Disease Division, Department of Microbiology, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India
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Mato-Basalo R, Lucio-Gallego S, Alarcón-Veleiro C, Sacristán-Santos M, Quintana MDPM, Morente-López M, de Toro FJ, Silva-Fernández L, González-Rodríguez A, Arufe MC, Labora JAF. Action Mechanisms of Small Extracellular Vesicles in Inflammaging. Life (Basel) 2022; 12:life12040546. [PMID: 35455036 PMCID: PMC9028066 DOI: 10.3390/life12040546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 03/31/2022] [Accepted: 04/01/2022] [Indexed: 02/05/2023] Open
Abstract
The accumulation process of proinflammatory components in the body due to aging influences intercellular communication and is known as inflammaging. This biological mechanism relates the development of inflammation to the aging process. Recently, it has been reported that small extracellular vesicles (sEVs) are mediators in the transmission of paracrine senescence involved in inflammatory aging. For this reason, their components, as well as mechanisms of action of sEVs, are relevant to develop a new therapy called senodrugs (senolytics and senomorphic) that regulates the intercellular communication of inflammaging. In this review, we include the most recent and relevant studies on the role of sEVs in the inflammatory aging process and in age-related diseases such as cancer and type 2 diabetes.
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