Arabidopsis MicroRNAs

From: Plant Physiology | Date: January 1, 2008| Author: Grennan, Aleel K | Copyright information

BACKGROUND

MicroRNAs (miRNAs) are noncoding RNAs approximately 21 nucleotides long that regulate gene expression. This regulation is achieved in two ways: binding to specific target RNAs targeting them for degradation or possibly attenuating translation of the target mRNA. Unlike small interfering RNAs (siRNAs) that are derived from mRNAs, transposons, viruses, or heterochromatin DNA, miRNAs are encoded by distinct genomic loci and are most likely transcribed by RNA polymerase II (pol ...

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