Related Experiment Video
Updated: Sep 11, 2025
07:26
Discrimintion and Mapping of the Primary and Processed Transcripts in Maize Mitochondrion Using a Circular RT-PCR-based Strategy
Published on: July 29, 2019
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Maize rough endosperm6 is a predicted RNA helicase required for miRNA processing and endosperm cell patterning
Tianxiao Yang1,2, Masaharu Suzuki1,2, L Curtis Hannah1,2
1Plant Molecular and Cellular Biology Program, IFAS, University of Florida, Gainesville, FL 32611, USA.
Plant Physiology
|August 12, 2025
Summary
The rough endosperm6 (rgh6) gene in maize encodes a DEAD-box RNA helicase essential for microRNA (miRNA) processing. This impacts maize kernel development and gene regulation.
Area of Science:
- Plant Molecular Genetics
- Developmental Biology
- RNA Biology
Background:
- Maize (Zea mays) endosperm development relies on precise RNA processing.
- Mutations affecting RNA processing proteins can disrupt kernel development.
Purpose of the Study:
- To identify and characterize the gene responsible for the maize rough endosperm6 (rgh6) mutation.
- To elucidate the role of RGH6 in endosperm development and miRNA processing.
Main Methods:
- Molecular genetic analysis of maize mutants.
- Positional cloning and transposon tagging to identify the RGH6 gene.
- Analysis of miRNA precursor and mature levels.
- Confocal microscopy for protein localization.
Main Results:
- The rgh6 mutation was mapped to a three-gene interval and identified as a predicted DEAD-box RNA helicase.
- Mutant rgh6 kernels exhibit reduced grain fill and altered cell type markers.
- RGH6 protein localizes to the nucleolus and nuclear speckles.
- rgh6 mutants show increased precursor miRNA and decreased mature miRNA levels.
Conclusions:
- The DEAD-box RNA helicase RGH6 is crucial for microRNA (miRNA) processing in maize endosperm.
- Proper miRNA processing and target regulation by RGH6 are essential for normal maize kernel development.
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