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Sequence fingerprints of microRNA conservation
1Department of Cardiology, Peking University Third Hospital, Beijing, China. dr_shibing@bjmu.edu.cn
Plos One
|October 31, 2012
Summary
MicroRNA (miRNA) sequences contain unique "fingerprints" that predict their conservation across species. These fingerprints differ significantly between mammals, plants, and insects, suggesting novel evolutionary mechanisms in mammals.
Area of Science:
- Genomics and Molecular Biology
- Evolutionary Biology
- Bioinformatics
Background:
- Protein-coding gene conservation is linked to sequence features across species.
- The relationship between microRNA (miRNA) conservation and sequence characteristics is largely unknown.
Purpose of the Study:
- To investigate the association between miRNA sequence features and their conservation patterns.
- To explore species-specific differences in miRNA evolution and identify potential novel mechanisms.
Main Methods:
- Comparative sequence analysis of miRNAs across diverse species (mammals, insects, plants).
- Examination of base content, cleavage sites, and 5' end preferences in conserved versus non-conserved miRNAs.
- Hypothesis generation regarding the role of protein-coding gene introns in mammalian miRNA evolution.
Main Results:
- miRNA sequences possess 'fingerprints' (e.g., base content, cleavage sites) correlating with conservation.
- Mammalian and plant miRNAs exhibit opposing correlations between conservation and AU/GC content.
- Conserved mammalian miRNAs prefer 5' U, while less-conserved ones prefer non-U, linked to functional diversity and environmental pressures.
Conclusions:
- miRNA sequence fingerprints are species-specific indicators of conservation.
- Mammals may employ unique mechanisms for miRNA origin and evolution, potentially involving introns.
- Findings provide predictive tools for miRNA conservation and enhance understanding of miRNA function and evolution.
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