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Related Concept Videos

The Nucleus01:32

The Nucleus

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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.
Arrangement of DNA within Nucleus
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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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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Chromatin Structure Regulates pre-mRNA Processing02:41

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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The Nucleolus02:55

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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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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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The Nucleus01:25

The Nucleus

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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.
Arrangement of DNA within Nucleus
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The chromatoid body: a germ-cell-specific RNA-processing centre.

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The chromatoid body, a key structure in male germ cells, organizes microRNA and RNA decay. This finding suggests its role in controlling RNA processing during sperm development.

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Area of Science:

  • Spermatogenesis research
  • Cell biology
  • Molecular reproductive biology

Background:

  • The chromatoid body is a unique cytoplasmic structure found in male germ cells.
  • Its precise function in spermatogenesis has been poorly understood for decades.
  • Recent studies suggest a role in RNA regulation.

Purpose of the Study:

  • To investigate the function of the chromatoid body in male germ cells.
  • To explore the involvement of microRNA and RNA-decay pathways in chromatoid body activity.

Main Methods:

  • Analysis of microRNA localization within spermatids.
  • Investigation of RNA-decay factor association with the chromatoid body.
  • Dynamic imaging of chromatoid body movement and interactions.

Main Results:

  • Evidence indicates that microRNA and RNA-decay pathways converge at the chromatoid body.
  • The chromatoid body exhibits dynamic movement within the cytoplasm of haploid spermatids.
  • These findings implicate the chromatoid body in the regulation of RNA metabolism.

Conclusions:

  • The chromatoid body acts as a specialized intracellular domain for organizing RNA processing.
  • It plays a crucial role in controlling RNA metabolism during male germ cell development.
  • Further research into this structure can illuminate mechanisms of male fertility.