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5′‐3′ exoribonucleases (XRNs) play crucial roles in the control of RNA processing, quality, and quantity in eukaryotes. Although genome‐wide profiling of RNA decay fragments is now feasible, how XRNs shape the plant mRNA degradome remains elusive. Here, we profiled and analyzed the RNA degradomes of Arabidopsis wild‐type and mutant plants with defects in XRN activity. Deficiency of nuclear XRN3 or...
DICER‐LIKE (DCL) enzymes process double‐stranded RNA into small RNAs that act as regulators of gene expression. Arabidopsis DCL4 and DCL2 each allow the post‐transcriptional gene silencing (PTGS) of viruses and transgenes, but primary PTGS‐prone DCL4 outcompetes transitive PTGS‐prone DCL2 in wild‐type plants. This hierarchy likely prevents DCL2 having any detrimental effects on endogenous genes. Indeed,...
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