Emerin Is Required for Proper Nucleus Reassembly after Mitosis: Implications for New Pathogenetic Mechanisms for Laminopathies Detected in EDMD1 Patients
| العنوان: | Emerin Is Required for Proper Nucleus Reassembly after Mitosis: Implications for New Pathogenetic Mechanisms for Laminopathies Detected in EDMD1 Patients |
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| المؤلفون: | Magdalena Machowska, Magda Dubińska-Magiera, Daria Filipczak, Katarzyna Piekarowicz, Ryszard Rzepecki, Katarzyna Kozioł |
| المصدر: | Cells Cells, Vol 8, Iss 3, p 240 (2019) Volume 8 Issue 3 |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | 0301 basic medicine, Emerin, Mitosis, EDMD1, Laminopathy, Spindle Apparatus, laminopathy, Microtubules, Antibodies, Article, Tubulin binding, 03 medical and health sciences, Epitopes, 0302 clinical medicine, Tubulin, medicine, Humans, lamin, lcsh:QH301-705.5, lamin A/C, Centrosome, Nuclear Lamina, biology, emerin, Chromatin binding, Cell Cycle, Membrane Proteins, Nuclear Proteins, LAP2β, General Medicine, medicine.disease, Lamin Type A, Muscular Dystrophy, Emery-Dreifuss, Cell biology, Spindle apparatus, DNA-Binding Proteins, 030104 developmental biology, Phenotype, lcsh:Biology (General), mitotic spindle, biology.protein, 030217 neurology & neurosurgery, Gene Deletion, HeLa Cells, Protein Binding |
| الوصف: | Emerin is an essential LEM (LAP2, Emerin, MAN1) domain protein in metazoans and an integral membrane protein associated with inner and outer nuclear membranes. Mutations in the human EMD gene coding for emerin result in the rare genetic disorder: Emery&ndash Dreifuss muscular dystrophy type 1 (EDMD1). This disease belongs to a broader group called laminopathies&mdash a heterogeneous group of rare genetic disorders affecting tissues of mesodermal origin. EDMD1 phenotype is characterized by progressive muscle wasting, contractures of the elbow and Achilles tendons, and cardiac conduction defects. Emerin is involved in many cellular and intranuclear processes through interactions with several partners: lamins barrier-to-autointegration factor (BAF), &beta catenin, actin, and tubulin. Our study demonstrates the presence of the emerin fraction which associates with mitotic spindle microtubules and centrosomes during mitosis and colocalizes during early mitosis with lamin A/C, BAF, and membranes at the mitotic spindle. Transfection studies with cells expressing EGFP-emerin protein demonstrate that the emerin fusion protein fraction also localizes to centrosomes and mitotic spindle microtubules during mitosis. Transient expression of emerin deletion mutants revealed that the resulting phenotypes vary and are mutant dependent. The most frequent phenotypes include aberrant nuclear shape, tubulin network mislocalization, aberrant mitosis, and mislocalization of centrosomes. Emerin deletion mutants demonstrated different chromatin binding capacities in an in vitro nuclear assembly assay and chromatin-binding properties correlated with the strength of phenotypic alteration in transfected cells. Aberrant tubulin staining and microtubule network phenotype appearance depended on the presence of the tubulin binding region in the expressed deletion mutants. We believe that the association with tubulin might help to &ldquo deliver&rdquo emerin and associated membranes to decondensing chromatin. Preliminary analyses of cells from Polish patients with EDMD1 revealed that for several mutations thought to be null for emerin protein, a truncated emerin protein was present. We infer that the EDMD1 phenotype may be strengthened by the toxicity of truncated emerin expressed in patients with certain nonsense mutations in EMD. |
| وصف الملف: | application/pdf |
| تدمد: | 2073-4409 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28b743fc7eaa843f1def353d3488289cTest https://pubmed.ncbi.nlm.nih.gov/30871242Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....28b743fc7eaa843f1def353d3488289c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20734409 |
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