Comparative analysis of non-autonomous effects of tasiRNAs and miRNAs in Arabidopsis thaliana.

Abstract:

:In plants, small interfering RNAs (siRNAs) can trigger a silencing signal that may spread within a tissue to adjacent cells or even systemically to other organs. Movement of the signal is initially limited to a few cells, but in some cases the signal can be amplified and travel over larger distances. How far silencing initiated by other classes of plant small RNAs (sRNAs) than siRNAs can extend has been less clear. Using a system based on the silencing of the CH42 gene, we have tracked the mobility of silencing signals initiated in phloem companion cells by artificial microRNAs (miRNA) and trans-acting siRNA (tasiRNA) that have the same primary sequence. In this system, both the ta-siRNA and the miRNA act at a distance. Non-autonomous effects of the miRNA can be triggered by several different miRNA precursors deployed as backbones. While the tasiRNA also acts non-autonomously, it has a much greater range than the miRNA or hairpin-derived siRNAs directed against CH42, indicating that biogenesis can determine the non-autonomous effects of sRNAs. In agreement with this hypothesis, the silencing signals initiated by different sRNAs differ in their genetic requirements.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

de Felippes FF,Ott F,Weigel D

doi

10.1093/nar/gkq1240

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

2880-9

issue

7

eissn

0305-1048

issn

1362-4962

pii

gkq1240

journal_volume

39

pub_type

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