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Updated: Jun 10, 2026
06:16
mirMachine: A One-Stop Shop for Plant miRNA Annotation
Published on: May 1, 2021
Plant microRNAs: an insight into their gene structures and evolution
1Department of Plant and Soil Sciences and KTRDC, University of Kentucky, Lexington, KY 40546, USA. gtang2@uky.edu
Seminars in Cell & Developmental Biology
|August 10, 2010
Summary
MicroRNAs (miRNAs) are key gene regulators originating from protein-coding genes through duplication and mutation. Their evolution in plants involves conservation and species-specific changes, shaping gene regulatory networks.
Area of Science:
- Plant molecular biology
- Genomics
- Evolutionary biology
Background:
- MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression post-transcriptionally in plants and animals.
- MiRNA genes are often found in intergenic regions and share promoter similarities with protein-coding genes.
- The evolution of miRNA genes is linked to their target genes, involving processes like duplication and inversion.
Purpose of the Study:
- To investigate the evolutionary origins and mechanisms of miRNA gene genesis in plants.
- To understand the relationship between miRNA genes and protein-coding genes.
- To elucidate the evolutionary dynamics of miRNA genes, including conservation and species-specificity.
Main Methods:
- Comparative genomics analysis to identify conserved and non-conserved miRNAs.
- Bioinformatic analysis of miRNA gene structures and promoter regions.
- Phylogenetic analysis to trace the evolutionary history of miRNA genes.
Main Results:
- MiRNA genes likely originated from protein-coding genes via duplication and subsequent genetic drift.
- Imperfect inverted repeats in pre-miRNAs suggest evolution from inverted duplications of target genes.
- Plant miRNA evolution exhibits both deep conservation and species-specific diversification.
Conclusions:
- Duplication, inversion, and mutation of protein-coding genes are primary drivers in miRNA gene evolution.
- Co-evolution between miRNA and target genes maintains dynamic gene regulatory networks in plants.
- Understanding miRNA evolution provides insights into plant gene regulation and adaptation.
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