Regulation of microRNA on plant development and viral infection

THE FIRST MIRNA WAS IDENTIFIED IN C. ELEGANS AS EARLY AS IN 1993; THE IMPORTANCE OF MIRNAS, HOWEVER, IS RECOGNIZED ONLY RECENTLY AFTER THE DISCOVERY OF MIRNAS EXISTING UNIVERSALLY IN EUKARYOTIC ORGANISMS. THE SECOND MIRNA WAS IDENTIFIED IN 20001]. SINCE …

Regulation of microRNA on plant development and viral infection

MicroRNAs (miRNAs) are a class of ~22 nt noncoding regulatory RNAs which are universal in eukaryotes. They act as negative regulator of gene expression by targeting mRNAs for cleavage or translational repression. miRNAs widely participate in regulation of gene expression associated with plant developmental processes, such as organs morpho- genesis and signal transduction pathway in plants. Similar to antiviral RNA silencing in plants, miRNA pathway is also interfered by silencing suppressors encoded by viruses. In this review we give a brief summary of the differences between miRNA-mediated regulatory pathway and siRNA-mediated RNA silenc- ing. In particular, we review the recent studies on miRNA regulatory roles in plant developmental processes, as well as the interference of viral sup- pressors in miRNA pathway, aiming to get an insight into the complexity of gene expression regulation in eukaryotic organisms.