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Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development
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Evolution: How a Homeobox Gene Cuts the Mustard Leaf.
1Institute of Molecular Plant Sciences, University of Edinburgh, Max Born Crescent, Edinburgh EH9 3BF, UK.
Current Biology : CB
|December 18, 2019
Summary
Gene duplication created the RCO homeobox gene, enabling dissected crucifer leaves. This gene fine-tunes its own activity and uses cytokinin signaling to control leaf growth.
Area of Science:
- Plant developmental biology
- Evolutionary genetics
Background:
- Leaf dissection in crucifers is a key evolutionary trait.
- The RCO homeobox gene is implicated in regulating leaf morphology.
Purpose of the Study:
- Investigate the evolutionary origins of the RCO gene.
- Elucidate the molecular mechanisms by which RCO controls leaf dissection.
- Understand the role of RCO in plant growth regulation.
Main Methods:
- Comparative genomics to identify RCO gene origins.
- Gene expression analysis to study RCO targets.
- Hormonal assays to assess cytokinin signaling.
- Phenotypic analysis of leaf morphology.
Main Results:
- Gene duplication and cis-regulatory divergence led to the RCO homeobox gene.
- RCO auto-repression evolved as a mechanism for fine-tuning its activity.
- RCO promotes leaf dissection by enhancing cytokinin signaling, thereby inhibiting local growth.
Conclusions:
- The RCO gene evolved through duplication and regulatory changes, facilitating dissected leaf evolution in crucifers.
- Auto-repression of RCO is crucial for precise control of its function.
- RCO's role in cytokinin signaling provides a molecular link between growth regulation and leaf morphology.
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