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Cells Coordinate Growth and Proliferation02:36

Cells Coordinate Growth and Proliferation

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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 Size01:22

Cell Size

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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.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
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The Cell Cycle Control System02:11

The Cell Cycle Control System

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The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
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The Cell Cycle Control System01:28

The Cell Cycle Control System

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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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Non-nuclear Inheritance01:29

Non-nuclear Inheritance

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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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Morphogenesis02:19

Morphogenesis

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Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.
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Updated: Nov 2, 2025

Kinematic Analysis of Cell Division and Expansion: Quantifying the Cellular Basis of Growth and Sampling Developmental Zones in Zea mays Leaves
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内部スケールとしてDNA含有量を用いた植物における細胞サイズ制御

Marco D'Ario1, Rafael Tavares1, Katharina Schiessl1

  • 1Cell and Developmental Biology, John Innes Centre, Norwich NR4 7UH, UK.

Science (New York, N.Y.)
|June 11, 2021
PubMed
まとめ

植物細胞はKIPに関連するタンパク質4 (KRP4) を用いてサイズを制御する. F-BOX-LIKE 17 (FBL17) は,KRP4のレベルを調節し,適切な成長のために子細胞が一貫したサイズを維持することを保証します.

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High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications
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Last Updated: Nov 2, 2025

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科学分野:

  • 植物生物学
  • 細胞循環の調節
  • 分子遺伝学

背景:

  • ユカリオット細胞は種と細胞タイプに固有のサイズを維持しなければならないが,そのメカニズムは完全に理解されていない.
  • 細胞サイズ制御は発達と機能に不可欠であり,不対称な細胞分裂のようなプロセスから生じる変動性がある.

研究 の 目的:

  • アラビドプシスの幹細胞が,非対称的な分裂後の大きさの変化を修正する方法を調査する.
  • 細胞サイズホメオスタシスにおけるKIP関連タンパク質4 (KRP4) とF-BOX-LIKE17 (FBL17) の役割を明らかにする.

主な方法:

  • KRP4 と FBL17 に影響する *アラビドプシス* 変異体の分析
  • 細胞サイズ調節メカニズムを予測するために,阻害剤の希釈モデリング.
  • 細胞分裂と成長のダイナミクスの顕微鏡観察

主要な成果:

  • アラビドプシスの芽幹細胞の細胞サイズ変動は,DNA合成前の成長期を調節することによって修正されます.
  • KRP4はDNA合成への侵入を阻害し,ミトスの染色体と結合する.
  • FBL17は過剰なKRP4を除去し,子細胞のレベルを比較し,強固なサイズ調節を保証します.

結論:

  • 細胞サイクルの調節器 (KRP4) は,ミトスの染色体関連によって安定させられ,DNAの内容を読むことで細胞サイズ独立のスケールとして作用する.
  • このメカニズムは,子細胞が一貫したサイズを達成し,組織ホメオスタシスを維持することを保証します.