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RNA-directed DNA methylation requires an AGO4-interacting member of the SPT5 elongation factor family.


ABSTRACT: Recent studies have identified a conserved WG/GW-containing motif, known as the Argonaute (AGO) hook, which is involved in the recruitment of AGOs to distinct components of the eukaryotic RNA silencing pathways. By using this motif as a model to detect new components in plant RNA silencing pathways, we identified SPT5-like, a plant-specific AGO4-interacting member of the nuclear SPT5 (Suppressor of Ty insertion 5) RNA polymerase (RNAP) elongation factor family that is characterized by the presence of a carboxy-terminal extension with more than 40 WG/GW motifs. Knockout SPT5-like mutants show a decrease in the accumulation of several 24-nt RNAs and hypomethylation at different loci revealing an implication in RNA-directed DNA methylation (RdDM). Here, we propose that SPT5-like emerged in plants as a facultative RNAP elongation factor. Its plant-specific origin and role in RdDM might reflect functional interactions with plant-specific RNA Pols required for RdDM.

SUBMITTER: Bies-Etheve N 

PROVIDER: S-EPMC2711833 | biostudies-other | 2009 Jun

REPOSITORIES: biostudies-other

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RNA-directed DNA methylation requires an AGO4-interacting member of the SPT5 elongation factor family.

Bies-Etheve Natacha N   Pontier Dominique D   Lahmy Sylvie S   Picart Claire C   Vega Danielle D   Cooke Richard R   Lagrange Thierry T  

EMBO reports 20090403 6


Recent studies have identified a conserved WG/GW-containing motif, known as the Argonaute (AGO) hook, which is involved in the recruitment of AGOs to distinct components of the eukaryotic RNA silencing pathways. By using this motif as a model to detect new components in plant RNA silencing pathways, we identified SPT5-like, a plant-specific AGO4-interacting member of the nuclear SPT5 (Suppressor of Ty insertion 5) RNA polymerase (RNAP) elongation factor family that is characterized by the presen  ...[more]

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