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Related Experiment Video

Updated: Jul 9, 2026

Non-radioactive in situ Hybridization Protocol Applicable for Norway Spruce and a Range of Plant Species
11:56

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Published on: April 17, 2009

Plants, MEN and SIN.

Mariette Bedhomme1, Stefan Jouannic, Antony Champion

  • 1Laboratoire Cycle Cellulaire, Développement et Différenciation, Institut de Biotechnologie des Plantes, UMR 8618, Batiment 630, Universite Paris XI, Orsay, France.

Plant Physiology and Biochemistry : PPB
|December 7, 2007
PubMed
Summary
This summary is machine-generated.

Evolution has repurposed ancient signaling pathways. Plant homologs of yeast cell division regulators do not control cytokinesis but are involved in cell type specification, demonstrating evolutionary recycling of signaling elements.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Cell Biology

Background:

  • The Septum Initiation Network (SIN) and Mitotic Exit Network (MEN) pathways regulate cell division and cytokinesis in fungi.
  • Core elements of SIN/MEN pathways, including GTPases and kinases, are conserved in plants, suggesting a potential role in coordinating cell division.
  • Previous research identified Arabidopsis thaliana signaling elements homologous to core SIN/MEN components.

Purpose of the Study:

  • To investigate the function of plant SIN/MEN-like signaling elements in multicellular organisms.
  • To determine if these elements coordinate mitotic exit with cytokinesis in plants.
  • To explore the evolutionary conservation and functional divergence of these ancient signaling pathways.

Main Methods:

  • Comparative analysis of signaling elements across species, focusing on fungi and plants.
  • Functional characterization of Arabidopsis thaliana genes (AtSGP GTPase, AtMAP3Kepsilon kinase) and their paralogs.
  • Complementation assays using Arabidopsis genes in fission yeast mutants.
  • Protein-protein interaction studies between plant and yeast proteins.
  • Analysis of transcriptional regulation and expression data for plant SIN-like elements.

Main Results:

  • Core SIN/MEN pathway elements are found in fungi, plants, and Mycetozoa, but not widely conserved across all eukaryotes.
  • Arabidopsis homologs of SIN/MEN pathway components can functionally complement fission yeast mutants and interact with yeast proteins.
  • Despite functional complementation, plant SIN-like elements do not appear to coordinate mitotic exit with cytokinesis in Arabidopsis.
  • Transcriptional and expression data indicate a role for plant SIN-like elements in cell type specification.

Conclusions:

  • Plants utilize signaling elements homologous to fungal SIN/MEN pathways, but these have been functionally repurposed.
  • Evolution has recycled ancient signaling pathway components for novel functions, such as cell type specification in plants.
  • The study highlights the dynamic nature of signaling pathway evolution and functional adaptation in multicellular organisms.