Conservation and divergence of plant microRNA genes

The Plant Journal : for Cell and Molecular Biology
Baohong ZhangTodd A Anderson

Abstract

MicroRNA (miRNA) is one class of newly identified, small, non-coding RNAs that play versatile and important roles in post-transcriptional gene regulation. All miRNAs have similar secondary hairpin structures; many of these are evolutionarily conserved. This suggests a powerful approach to predict the existence of new miRNA orthologs or homologs in other species. We developed a comprehensive strategy to identify new miRNA homologs by mining the repository of available ESTs. A total of 481 miRNAs, belonging to 37 miRNA families in 71 different plant species, were identified from more than 6 million EST sequences in plants. The potential targets of the EST-predicted miRNAs were also elucidated from the EST and protein databases, providing additional evidence for the real existence of these miRNAs in the given plant species. Some plant miRNAs were physically clustered together, suggesting that these miRNAs have similar gene expression patterns and are transcribed together as a polycistron, as observed among animal miRNAs. The uracil nucleotide is dominant in the first position of 5' mature miRNAs. Our results indicate that many miRNA families are evolutionarily conserved across all major lineages of plants, including mosses, gymnos...Continue Reading

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Jul 16, 2008·Plant Cell Reports·Yan-du LuSong Qin
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