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Updated: Jan 21, 2026
08:48
Peptide-derived Method to Transport Genes and Proteins Across Cellular and Organellar Barriers in Plants
Published on: December 16, 2016
11.0K
A Cellular Insulator against CLE45 Peptide Signaling
Alice S Breda1, Ora Hazak1, Patrick Schultz2
1Department of Plant Molecular Biology, University of Lausanne, Biophore Building, 1015 Lausanne, Switzerland.
Current Biology : CB
|July 23, 2019
Summary
The OCTOPUS (OPS) protein in Arabidopsis thaliana roots acts as an "insulator," dampening CLE45 peptide signaling to promote protophloem sieve element differentiation and ensure proper plant development.
Area of Science:
- Plant biology
- Developmental biology
- Cell signaling
Background:
- Plant development relies on apical meristems generating new organs through stem cell activity.
- Phytohormones and peptide signals regulate transitions between stemness, proliferation, and differentiation.
- In Arabidopsis thaliana roots, CLE45 peptide signaling via BAM3 receptor can inhibit protophloem sieve element (PPSE) differentiation.
Purpose of the Study:
- To investigate the role of the OCTOPUS (OPS) gene in PPSE differentiation.
- To elucidate the mechanism by which OPS influences CLE45 signaling.
- To understand how PPSE differentiation is coordinated with stem cell regulation.
Main Methods:
- Investigated the function of the OCTOPUS (OPS) gene in Arabidopsis thaliana root development.
- Analyzed the interaction between OPS protein and CLE45 signaling components.
- Examined the effects of altered OPS dosage on PPSE differentiation and response to CLE peptides.
Main Results:
- OPS protein promotes PPSE differentiation by reducing sensitivity to CLE45 peptide signaling.
- OPS likely interferes physically with CLE45 signaling components.
- Increased OPS levels confer resistance to other CLE peptides and induce premature differentiation.
Conclusions:
- OPS acts as a novel "insulator" antagonizing CLE45 signaling to facilitate PPSE differentiation.
- This mechanism provides quantitative control over stem cell transitions in plant development.
- OPS plays a critical role in coordinating cell fate decisions in response to external signals.
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