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How stochastic cell fate and endoreduplication yield non-random epidermal patterns.

Nicola Trozzi1, Mateusz Majda1

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|April 29, 2026
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Giant pavement cells in Arabidopsis thaliana arise from a shared genetic pathway. Their seemingly random distribution is explained by tissue growth and cell division dynamics, not pure chance.

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Area of Science:

  • Plant biology
  • Developmental biology
  • Cellular heterogeneity

Background:

  • Pavement cells in Arabidopsis thaliana exhibit significant size and ploidy variation.
  • The developmental rules governing this cellular heterogeneity across organs are not well understood.

Purpose of the Study:

  • To identify genetic pathways controlling pavement cell size and ploidy.
  • To investigate the spatial distribution patterns of large pavement cells and determine if they are truly random.
  • To develop a quantitative framework for analyzing spatial organization in growing tissues.

Main Methods:

  • Utilized whole-tissue imaging of Arabidopsis thaliana sepals and leaves.
  • Employed two independent computational randomization approaches to analyze cell distribution.
  • Developed a stochastic cell-autonomous model to simulate tissue growth and cell fate decisions.

Main Results:

  • Identified a conserved genetic pathway promoting large, polyploid pavement cells in both sepals and leaves.
  • Demonstrated that the 'scattered' distribution of giant cells is not random but emerges from tissue growth dynamics.
  • Showed that proliferation history can transform initial stochastic cell fate decisions into a statistically non-random mature pattern.

Conclusions:

  • A shared genetic pathway influences pavement cell size and ploidy, contributing to organ-level heterogeneity.
  • The spatial pattern of large pavement cells arises from a dynamic interplay between cell growth, division, and tissue expansion.
  • The study provides a novel quantitative framework for understanding spatial organization in cellular mosaics and the conversion of stochastic events into non-random patterns during development.