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Marchantia polymorpha, a New Model Plant for Autophagy Studies
Takuya Norizuki1,2, Takehiko Kanazawa2,3, Naoki Minamino2
1Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan.
Frontiers in Plant Science
|August 6, 2019
Summary
Autophagy gene evolution in plants reveals gene multiplication occurred during land plant evolution. The liverwort Marchantia polymorpha offers a new system for studying autophagy mechanisms and evolution.
Area of Science:
- Plant molecular biology
- Evolutionary biology
- Cellular biology
Background:
- Autophagy is crucial for degrading cellular components and is vital for plant stress responses.
- Understanding autophagy gene evolution is complex due to gene multiplication in model plants like Arabidopsis thaliana.
- Limited knowledge exists on autophagy genes in basal land plants and charophytes.
Purpose of the Study:
- To investigate the diversification of autophagy (ATG) genes during plant evolution.
- To compare ATG gene composition in basal land plants and charophytes.
- To establish a model system for studying autophagy in the liverwort Marchantia polymorpha.
Main Methods:
- Comparative analysis of ATG gene composition across various plant species, including liverworts and charophytes.
- Generation of transgenic Marchantia polymorpha expressing fluorescently tagged MpATG8.
- Creation of autophagy-defective mutants in Marchantia polymorpha using CRISPR/Cas9 genome editing.
Main Results:
- Marchantia polymorpha, Klebsormidium nitens, and Chara braunii possess fundamental ATG gene sets with low redundancy.
- ATG gene multiplication appears to have occurred during land plant evolution.
- Established Marchantia polymorpha as a functional system for autophagy research, demonstrating MpATG8's role as an autophagosome marker.
Conclusions:
- The study provides insights into ATG gene diversification and the evolution of autophagy in plants.
- Marchantia polymorpha serves as a valuable model organism for future autophagy research.
- Gene duplication and potential neofunctionalization of ATG genes are key aspects of plant autophagy evolution.
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