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Plant cells use KIP-related protein 4 (KRP4) to control size. F-BOX-LIKE 17 (FBL17) helps regulate KRP4 levels, ensuring daughter cells maintain consistent sizes for proper growth.

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Area of Science:

  • Plant biology
  • Cell cycle regulation
  • Molecular genetics

Background:

  • Eukaryotic cells must maintain species- and cell type-specific sizes, but the mechanisms for this are not fully understood.
  • Cell size control is crucial for development and function, with variability arising from processes like asymmetric cell division.

Purpose of the Study:

  • To investigate how *Arabidopsis* shoot stem cells correct size variability after asymmetric divisions.
  • To elucidate the role of KIP-related protein 4 (KRP4) and F-BOX-LIKE 17 (FBL17) in cell size homeostasis.

Main Methods:

  • Analysis of *Arabidopsis* mutants affecting KRP4 and FBL17.
  • Inhibitor dilution modeling to predict cell size regulation mechanisms.
  • Microscopic observation of cell division and growth dynamics.

Main Results:

  • Cell size variability in *Arabidopsis* shoot stem cells is corrected by regulating the pre-DNA synthesis growth period.
  • KRP4 inhibits entry into DNA synthesis and associates with mitotic chromosomes.
  • FBL17 removes excess KRP4, ensuring comparable levels in daughter cells and robust size regulation.

Conclusions:

  • A cell cycle regulator (KRP4), stabilized by mitotic chromosome association, acts as a cell size-independent scale by reading DNA content.
  • This mechanism ensures daughter cells achieve consistent sizes, maintaining tissue homeostasis.