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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.
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https://hal.archives-ouvertes.fr/hal-00698474
Contributor : Elisabeth Goetschy Connect in order to contact the contributor
Submitted on : Wednesday, May 16, 2012 - 3:18:24 PM
Last modification on : Wednesday, March 16, 2022 - 4:06:01 PM

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Natacha Bies-Etheve, Dominique Pontier, Sylvie Lahmy, Claire Picart, Danielle Vega, et al.. RNA-directed DNA methylation requires an AGO4-interacting member of the SPT5 elongation factor family.. EMBO Reports, EMBO Press, 2009, 10 (6), pp.649-54. ⟨10.1038/embor.2009.31⟩. ⟨hal-00698474⟩

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