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Updated: Jan 31, 2026

Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome
Published on: June 15, 2016
Root branching toward water involves posttranslational modification of transcription factor ARF7
Beatriz Orosa-Puente1, Nicola Leftley2, Daniel von Wangenheim2
1Department of Biosciences, University of Durham, Durham DH1 3LE, UK.
Plant root branching, known as hydropatterning, relies on auxin response factor ARF7. SUMOylation of ARF7 controls its DNA binding and recruits repressor IAA3, regulating root growth in response to water.
Area of Science:
- Plant biology
- Molecular biology
- Developmental biology
Background:
- Plants adapt root architecture to soil conditions.
- Root branching (hydropatterning) occurs in response to water availability.
- Auxin signaling pathways regulate plant development.
Purpose of the Study:
- Investigate the molecular mechanisms of hydropatterning.
- Identify key regulators of root branching in response to water.
- Elucidate the role of ARF7 in the hydropatterning response.
Main Methods:
- Analysis of gene expression patterns.
- Investigating protein-protein interactions.
- Studying posttranslational modifications of transcription factors.
Main Results:
- Hydropatterning is dependent on auxin response factor ARF7.
- ARF7 induces asymmetric expression of its target gene LBD16.
- SUMOylation of ARF7 regulates its DNA binding and recruitment of IAA3 repressor.
Conclusions:
- SUMOylation of ARF7 is crucial for hydropatterning.
- SUMO-dependent auxin response regulation controls root branching.
- This mechanism allows plants to optimize root growth for water acquisition.
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