Abstract

Functional homologous and non-homologous clusters of MIR genes that co-regulate target mRNA transcripts have been identified in plants

Highlights

  • MicroRNAs are endogenous single-stranded small RNAs that regulate the expression of specific mRNAs involved in diverse biological processes

  • MicroRNAs are endogenous approximately 21nucleotide single-stranded small RNAs derived from MIRNA precursors that are able to fold-back into a stable secondary structure. miRNAs act in many developmental processes as well as environmental and pathogenic responses [1,2,3,4] through the post-transcriptional regulation of target mRNAs

  • In silico identification of miRNA clusters in Arabidopsis, rice and poplar genomes A systematic search for consecutive MIRNA loci was carried out in three model plant genomes that have an exhaustive description of their miRNA species

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Summary

Introduction

MicroRNAs (miRNAs) are endogenous single-stranded small RNAs that regulate the expression of specific mRNAs involved in diverse biological processes. MiRNAs act in many developmental processes as well as environmental and pathogenic responses [1,2,3,4] through the post-transcriptional regulation of target mRNAs. MicroRNAs (miRNAs) are endogenous approximately 21nucleotide single-stranded small RNAs derived from MIRNA precursors that are able to fold-back into a stable secondary structure (stem loop or hairpin). Formation of an approximately 21-bp miRNA-miRNA* duplex successively involves two RNase III enzymatic complexes: the Drosha enzyme, which cleaves long pri-MIRNA in the nucleus to generate short (approximately 70- to 80-nucleotide) hairpins (so called pre-MIRNA) and the Dicer enzyme, which produces the miRNA after cytoplasmic export of pre-MIRNAs through Exportin 5 [11] In plants, both cleavages are likely nuclear localized and involve a single Dicer-like enzyme 1 (DCL1) complex [6,9,10]. The miRNAs guide sequence-specific cleavage and/or translational repression of target transcripts into the RISC complex [6,911]

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