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Auxin triggers a genetic switch.

Steffen Lau1, Ive De Smet, Martina Kolb

  • 1Department of Cell Biology, Max Planck Institute for Developmental Biology, Spemannstraße 35, D-72076 Tübingen, Germany.

Nature Cell Biology
|April 12, 2011
PubMed
Summary
This summary is machine-generated.

Plant development relies on gene regulation. This study reveals how auxin signaling controls gene feedback loops, ensuring precise cell specification through the MONOPTEROS (MP) and BODENLOS (BDL) proteins in Arabidopsis.

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Area of Science:

  • Plant developmental biology
  • Molecular genetics
  • Systems biology

Background:

  • Cell specification requires dynamic gene regulatory networks responding to transient signals.
  • Auxin, a plant hormone, influences development by regulating AUXIN RESPONSE FACTOR (ARF) transcription factors via AUXIN/INDOLE-3-ACETIC ACID (AUX/IAA) inhibitors.
  • The precise role of auxin in developmental patterning and the transcriptional control of ARF genes remain incompletely understood.

Purpose of the Study:

  • To elucidate the role of the Arabidopsis ARF protein MONOPTEROS (MP) in its own gene regulation and that of its inhibitor.
  • To investigate the mechanism by which auxin acts as a threshold-specific trigger in developmental responses.
  • To propose a general model for auxin-mediated gene regulatory feedback systems in plant development.

Main Methods:

  • Experimental analyses in Arabidopsis thaliana.
  • Computational modeling of gene regulatory networks.
  • Analysis of MONOPTEROS (MP) and BODENLOS (BDL) gene expression.
  • Investigation of auxin's role in protein degradation pathways.

Main Results:

  • The Arabidopsis ARF protein MONOPTEROS (MP) directly controls its own gene expression.
  • MP also regulates the expression of its AUX/IAA inhibitor, BODENLOS (BDL).
  • Auxin promotes BDL degradation, acting as a threshold-specific trigger to activate MP-mediated gene expression.

Conclusions:

  • A novel feedback mechanism is proposed where auxin triggers self-sustaining gene regulatory systems involving MP and BDL.
  • This mechanism contributes to robust and unequivocal developmental responses in plants.
  • The findings provide insights into how transient auxin signals establish stable cell fates during plant development.