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Related Concept Videos

The Nucleus01:32

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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
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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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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
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Seeing fat inside the nucleus.

Anete Romanauska1

  • 1Max Perutz Labs Vienna, 1300 Vienna, Austria.

Science (New York, N.Y.)
|November 25, 2021
PubMed
Summary
This summary is machine-generated.

The inner nuclear membrane is crucial for lipid metabolism. This research reveals its expanded functions in managing cellular fats.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • The inner nuclear membrane (INM) is a critical cellular structure.
  • Its role in nuclear organization is well-established.
  • Emerging evidence suggests involvement in cellular processes beyond structural support.

Purpose of the Study:

  • To investigate the role of the inner nuclear membrane in lipid metabolism.
  • To identify specific functions of the INM in regulating cellular lipids.

Main Methods:

  • Utilized advanced microscopy techniques to visualize INM-associated lipid droplets.
  • Performed biochemical assays to quantify lipid species at the INM.
  • Employed genetic manipulation to study the impact of INM proteins on lipid metabolism.

Main Results:

  • Demonstrated that the inner nuclear membrane directly interacts with lipid droplets.
  • Identified key enzymes involved in lipid synthesis localized to the INM.
  • Showed that INM integrity is essential for proper lipid homeostasis.

Conclusions:

  • The inner nuclear membrane plays a significant and expanded role in lipid metabolism.
  • The INM functions as a platform for regulating lipid synthesis and storage.
  • Targeting INM functions could offer new strategies for metabolic disease treatment.