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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
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Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
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The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
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Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
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Production of Large Numbers of Size-controlled Tumor Spheroids Using Microwell Plates
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SnapShot: Cell size control.

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Cell size varies greatly between and within organisms, influenced by DNA content and growth rates. Understanding the complex mechanisms controlling cell size remains a key challenge in biology.

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Area of Science:

  • Cell Biology
  • Genetics
  • Developmental Biology

Background:

  • Cell size displays significant diversity across all domains of life.
  • Cellular size variation is linked to DNA content and organismal growth rates.
  • Existing models for cell size control lack mechanistic definition.

Discussion:

  • Investigating the fundamental principles governing cell size regulation is crucial.
  • Exploring the relationship between DNA content, cell cycle, and cell size is essential.
  • Mechanistic insights into cell size control are needed to advance cell biology.

Key Insights:

  • Cell size diversity is a fundamental biological characteristic.
  • DNA content and growth rates are key correlates of cell size variation.
  • The precise mechanisms of cell size control are not yet fully understood.

Outlook:

  • Future research should focus on elucidating the molecular mechanisms of cell size control.
  • Further studies are needed to understand how cell size impacts organismal development and function.
  • Defining the regulatory networks governing cell size will open new avenues in developmental biology and disease research.