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Title: Evolution of plant microRNAs and their targets. Author: Axtell MJ, Bowman JL. Journal: Trends Plant Sci; 2008 Jul; 13(7):343-9. PubMed ID: 18502167. Abstract: MicroRNAs (miRNAs) are a specialized class of small silencing RNAs that regulate gene expression. They have a limited phylogenetic distribution among eukaryotes, suggestive of at least two independent origins from an ancestral small RNA-producing pathway. A set of 21 abundantly expressed miRNAs are clearly conserved among the angiosperms; many of these function to regulate transcription factors involved in developmental control. Recent experiments have uncovered a much larger set of weakly expressed, less conserved miRNAs in plants, and this group has provided insights into the origins of miRNAs and their targets. These data have provided a coherent set of hypotheses explaining the birth, selection and death of miRNAs in land plants.[Abstract] [Full Text] [Related] [New Search]