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Related Concept Videos

The Nucleolus02:55

The Nucleolus

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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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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 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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Functional Imaging of Viral Transcription Factories Using 3D Fluorescence Microscopy
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New insights into nucleolar structure and function.

Yun Wah Lam1, Laura Trinkle-Mulcahy2

  • 1Department of Biology and Chemistry, City University of Hong Kong Tat Chee Avenue, Kowloon Hong Kong.

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The nucleolus, a key nuclear body, is vital for ribosome production and cellular stress responses. Recent research reveals its broader roles in DNA repair and cell cycle regulation, offering therapeutic potential.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The nucleolus is a dynamic, non-membrane-bound nuclear organelle in eukaryotes.
  • It assembles around ribosomal DNA (rDNA) at nucleolar organizing regions.
  • Assembly is initiated by RNA polymerase I transcription.

Purpose of the Study:

  • To review recent advances in understanding nucleolar function.
  • To explore the nucleolus's diverse roles beyond ribosome biogenesis.
  • To highlight the therapeutic potential of targeting nucleolar pathways.

Main Methods:

  • Biochemical analyses
  • Proteomic analyses
  • Literature review of recent studies

Main Results:

  • The nucleolus participates in cell cycle regulation, DNA damage response, and RNA processing.
  • It plays a role in telomere metabolism and stress response.
  • Recent studies offer new insights into nucleolar assembly, disassembly, and regulation.

Conclusions:

  • The nucleolus has a more complex functional repertoire than previously known.
  • Further research is needed to fully elucidate its biological processes and regulation.
  • Targeting nucleolar pathways presents promising therapeutic opportunities.