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Updated: Mar 19, 2026
mirMachine: A One-Stop Shop for Plant miRNA Annotation
Published on: May 1, 2021
Comparative analysis of MIR168 promoters in three plant species
1College of Horticulture, Northwest A&F University, Yangling, Shaanxi, China.
Abstract:
MicroRNAs (miRNAs) play important roles in the regulation of gene expression by post-transcriptionally targeting mRNAs for cleavage or translational repression. miR168 is a key miRNA because it regulates the expression of the slicer protein ARGONAUTE1 (AGO1), which catalyzes mRNA cleavage. Interestingly, plant miR168s are highly evolutionarily conserved; however, it is unclear whether MIR168 promoter elements and expression patterns are also conserved. Here, we isolated MIR168 promoters from monocot rice and dicot grape genomes. To determine the expression pattern, different promoters were fused to a beta-glucoronidase reporter gene and the resulting constructs were then transformed in Arabidopsis. The results revealed clear differences in the MIR168 promoter sequence of monocot and dicot plant species. Moreover, the pattern of MIR168 promoter expression differed between monocots and dicots. These results suggest that, unlike that of miR168, the MIR168 promoter is not conserved in monocots and dicots.
Insights
Plant microRNA168 (miR168) is conserved, but its promoter is not. This study reveals distinct MIR168 promoter sequences and expression patterns between monocot and dicot species.
Area of Science:
- Plant molecular biology
- Gene regulation
- Evolutionary genomics
Background:
- MicroRNAs (miRNAs) regulate gene expression post-transcriptionally.
- miR168 is crucial as it targets ARGONAUTE1 (AGO1), a key protein in mRNA cleavage.
- While miR168 is highly conserved across plants, the conservation of its promoter and expression patterns remains unexplored.
Purpose of the Study:
- To investigate the evolutionary conservation of MIR168 promoter elements and expression patterns in plants.
- To compare MIR168 promoter sequences between monocot and dicot species.
- To analyze the expression patterns driven by MIR168 promoters in different plant types.
Main Methods:
- Isolation of MIR168 promoters from rice (monocot) and grape (dicot) genomes.
- Fusion of isolated promoters to a beta-glucoronidase reporter gene.
- Transformation of these constructs into Arabidopsis for expression analysis.
Main Results:
- Significant differences were observed in the MIR168 promoter sequences between monocot and dicot plant species.
- The expression patterns driven by the MIR168 promoters varied distinctly between monocots and dicots.
- These findings highlight a divergence in MIR168 promoter structure and function.
Conclusions:
- The MIR168 promoter is not conserved between monocot and dicot plant lineages.
- Evolutionary divergence extends beyond the miRNA sequence to its regulatory elements.
- This suggests differential regulation of ARGONAUTE1 (AGO1) expression in major plant groups.
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