AGO10 is a key component of the RNA-induced silencing complex (RISC), crucial for RNA-mediated post-transcriptional gene silencing (PTGS). It binds to guide RNAs, such as microRNAs (miRNAs) and small interfering RNAs (siRNAs), directing RISC to cleave homologous mRNAs, thereby repressing gene expression. AGO10 plays a vital role in plant development, specifically in the formation and maintenance of primary and axillary shoot apical meristems. It regulates leaf adaxial identity by suppressing miR165 and miR166 microRNAs in the shoot apical meristem (SAM) and leaf primordia. Furthermore, AGO10 represses miR398, which targets CCS1 chaperone mRNAs for translational inhibition. It acts as a negative regulator of AGO1 protein levels and is essential for stem cell function and organ polarity, although it is not subject to small RNA-mediated repression itself. AGO10 also co-regulates shoot apical meristem (SAM) organization with GATA18/HAN.
Key Research Findings on AGO10 Function: