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Related Concept Videos

Nuclear Export01:42

Nuclear Export

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
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Regulation of Nuclear Protein Sorting01:45

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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Nuclear Protein Sorting01:34

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
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Disassembly of Intermediate Filaments01:35

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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
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Additional Subnuclear Structures02:10

Additional Subnuclear Structures

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The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
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Nucleosome Remodeling02:54

Nucleosome Remodeling

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
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Detection of Nuclear Blebbing and DNA Leakage in Mammalian Cells by Immunofluorescence
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How nuclear envelope dynamics can direct laminopathy phenotypes.

David van Heerden1, Stefanie Klima1, Iman van den Bout1

  • 1Department of Physiology, Faculty of Health Sciences, University of Pretoria, South Africa; Centre for Neuroendocrinology, Department of Immunology, Faculty of Health Sciences, University of Pretoria, South Africa.

Current Opinion in Cell Biology
|December 4, 2023
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Summary

Nuclear envelope dynamics are crucial for genome regulation and cell function. Mutations in nuclear lamina and LINC proteins cause laminopathies, a group of diseases linked to nuclear envelope rupture and repair processes.

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Area of Science:

  • Cell Biology
  • Genetics
  • Biochemistry

Background:

  • The nuclear envelope spatially separates the genome from the cytoplasm.
  • It physically interacts with the genome, influencing gene expression and modification.
  • Nuclear dynamics, including shape changes, cell movement response, and division-related disassembly/reassembly, are essential for cellular health.

Purpose of the Study:

  • To review current knowledge on nuclear dynamics.
  • To explore the role of nuclear dynamics in laminopathies.
  • To propose a classification framework for laminopathies based on affected nuclear processes.

Main Methods:

  • Literature review of recent research on nuclear dynamics.
  • Analysis of genetic mutations affecting the nuclear lamina and LINC complex.
  • Identification of common molecular mechanisms in laminopathies.

Main Results:

  • Nuclear envelope dynamics are implicated in gene regulation and genome stability.
  • Laminopathies arise from disruptions in nuclear envelope structure and function.
  • Three key nuclear processes are identified as critical for classifying laminopathies: nuclear envelope formation, rupture repair, and response to mechanical stress.

Conclusions:

  • Mutations in nuclear lamina and LINC proteins disrupt nuclear envelope dynamics, leading to laminopathies.
  • Understanding commonalities in nuclear envelope formation and rupture repair may explain diverse laminopathy phenotypes.
  • Further research into nuclear dynamics is vital for developing therapeutic strategies for laminopathies.