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Related Concept Videos

Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

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...
Nuclear Stability03:18

Nuclear Stability

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Nuclear Protein Sorting01:34

Nuclear Protein Sorting

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.
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Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...
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Related Experiment Video

Updated: May 21, 2026

A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
05:47

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Published on: July 29, 2018

Mechanical regulation of nuclear structure and function.

Rui P Martins1, John D Finan, Farshid Guilak

  • 1Institute of Bioengineering, School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, United Kingdom.

Annual Review of Biomedical Engineering
|June 5, 2012
PubMed
Summary
This summary is machine-generated.

Mechanical forces alter cell nuclei, influencing gene expression through nuclear architecture. This review explores how the cytoskeleton, nucleoskeleton, and LINC complex transmit mechanical signals to the nucleus, impacting cell fate.

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Combining 3D Magnetic Force Actuator and Multi-Functional Fluorescence Imaging to Study Nucleus Mechanobiology

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Area of Science:

  • Cell Biology
  • Biophysics
  • Genomics

Background:

  • Mechanical loading impacts cell function, affecting both nuclear shape and gene expression.
  • Mechanotransduction typically involves cytoplasmic signaling cascades, but nuclear architecture also plays a role.
  • Gene expression can be directly controlled by changes in nuclear architecture.

Purpose of the Study:

  • To review the current understanding of nuclear architecture's role in mechanotransduction.
  • To describe how mechanical forces are transferred to the nucleus.
  • To discuss the implications for transcription and cell fate.

Main Methods:

  • Review of existing literature on nuclear architecture and mechanotransduction.
  • Analysis of the roles of the cytoskeleton, nucleoskeleton, and LINC complex.
  • Discussion of nuclear remodeling and its effects on nuclear stiffness.

Main Results:

  • Mechanical forces can alter nuclear architecture, influencing gene expression.
  • The cytoskeleton, nucleoskeleton, and LINC complex are key mediators of force transfer to the nucleus.
  • Nuclear remodeling affects nuclear stiffness and may be linked to cell differentiation.

Conclusions:

  • Nuclear architecture is a critical component of mechanotransduction, directly regulating genome function.
  • Understanding these mechanisms can provide insights into cell differentiation and fate determination.
  • Further research into nuclear architecture-mediated mechanoregulation is warranted.