A genomic map of viroid RNA motifs critical for replication and systemic trafficking

The Plant Cell
Xuehua ZhongBiao Ding

Abstract

RNA replication and systemic trafficking play significant roles in developmental regulation and host-pathogen interactions. Viroids are the simplest noncoding eukaryotic RNA pathogens and genetic units that are capable of autonomous replication and systemic trafficking and offer excellent models to investigate the role of RNA structures in these processes. Like other RNAs, the predicted secondary structure of a viroid RNA contains many loops and bulges flanked by double-stranded helices, the biological functions of which are mostly unknown. Using Potato spindle tuber viroid infection of Nicotiana benthamiana as the experimental system, we tested the hypothesis that these loops/bulges are functional motifs that regulate replication in single cells or trafficking in a plant. Through a genome-wide mutational analysis, we identified multiple loops/bulges essential or important for each of these biological processes. Our results led to a genomic map of viroid RNA motifs that mediate single-cell replication and systemic trafficking, respectively. This map provides a framework to enable high-throughput studies on the tertiary structures and functional mechanisms of RNA motifs that regulate viroid replication and trafficking. Our model...Continue Reading

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Mar 6, 2009·Plant Physiology·Shoudong ZhangFriedrich Kragler
Sep 29, 2009·Plant Physiology·Anjan K BanerjeeDavid J Hannapel
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