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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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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 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 Nucleolus and Its Associated Pathologies.

Marvin J Menjivar-Vallecillo1,2, Nadia V Padilla-Claros1,2, Pilar Gavarrete-Garrido1,2

  • 1GIMUNICAH, Faculty of Medicine, Pontificia Universidad Católica de Honduras, San Pedro Sula, Honduras.

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Summary
This summary is machine-generated.

The nucleolus, vital for ribosome production, also impacts cellular stress and diseases like cancer and autoimmune disorders. Dysfunctional nucleoli disrupt cell balance, immunity, and protein synthesis, contributing to various pathologies.

Keywords:
cell nucleolusdiseasemicroRNAsnucleolinribosomes

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Area of Science:

  • Cell Biology
  • Molecular Physiology
  • Pathology

Background:

  • The nucleolus is traditionally recognized for ribosome biogenesis.
  • Emerging evidence highlights its roles in cellular stress adaptation and disease pathogenesis.
  • Nucleolar dysfunction is implicated in diverse conditions, including cancer, autoimmune disorders, and aging.

Purpose of the Study:

  • To review and categorize nucleolus-associated diseases.
  • To elucidate the multifaceted roles of the nucleolus in health and disease.
  • To underscore the importance of nucleolar function in cellular homeostasis and human pathologies.

Main Methods:

  • Literature review and synthesis of current research on nucleolar function and disease.
  • Classification of nucleolus-associated diseases into distinct categories.
  • Analysis of the molecular mechanisms linking nucleolar alterations to pathological processes.

Main Results:

  • Nucleolar dysfunction impairs protein synthesis, cellular homeostasis, and immune responses.
  • Nucleolus-associated diseases are categorized into seven groups, including protein synthesis deficiencies, ribosomal alterations, cancer, aging/stress-related diseases, autoimmune diseases, and viral diseases.
  • Disruptions can lead to multisystem disorders and increased cancer susceptibility.

Conclusions:

  • The nucleolus plays a critical role beyond ribosome biogenesis, influencing cellular adaptation and disease.
  • Understanding nucleolar complexity is crucial for deciphering the molecular basis of human diseases.
  • Further research into nucleolar dysfunction will advance cell biology and disease pathology knowledge.