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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 stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
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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 development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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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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Emerging roles for the nucleolus in development and stem cells.

Bryony J Leeke1,2, Imke Staffhorst1,2, Michelle Percharde1,2

  • 1MRC Laboratory of Medical Sciences, London W12 0HS, UK.

Development (Cambridge, England)
|May 14, 2025
PubMed
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The nucleolus, crucial for ribosome biogenesis, also regulates genome organization and is vital for mammalian development. Its disruption is linked to developmental disorders and embryonic lethality.

Keywords:
DevelopmentESCsHeterochromatinNADsNuclear architectureNucleoli

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Genetics

Background:

  • The nucleolus is a key site for ribosome biogenesis.
  • Emerging evidence highlights its critical roles beyond ribosome production, particularly in mammalian development.
  • Nucleolar function and structure dynamically change during early embryonic development.

Purpose of the Study:

  • To review the multifaceted roles of nucleoli in mammalian development.
  • To emphasize the nucleolus's importance in genome organization and heterochromatin formation.
  • To introduce novel techniques for studying nucleolar function.

Main Methods:

  • Literature review of recent findings on nucleolar function in development.
  • Analysis of studies linking nucleolar disruption to pathologies.
  • Discussion of emerging technologies for nucleolar research.

Main Results:

  • Nucleoli undergo dynamic remodeling essential for the totipotency-to-pluripotency transition in early embryos.
  • Disruption of nucleolar factors leads to embryonic lethality in mouse models.
  • Nucleoli are implicated in genome organization and heterochromatin maintenance.
  • Nucleolar changes are observed in various human developmental disorders and disease states.

Conclusions:

  • The nucleolus plays a critical, multifaceted role in mammalian development, extending beyond ribosome biogenesis.
  • Nucleolar integrity and function are essential for proper genome regulation and embryonic development.
  • Further research using advanced techniques is needed to fully elucidate nucleolar roles in health and disease.