Heat-induced release of epigenetic silencing reveals the concealed role of an imprinted plant gene

Article Article scientifique Article Heat-induced release of epigenetic silencing reveals the concealed role of an imprinted plant gene eng 2014 author Sanchez Diego 751359 author Paszkowski Jerzy 134849 e1004806 10.1371/journal.pgen.1004806 25411840 1553-7390 http://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1004806 Epigenetic mechanisms suppress the transcription of transposons and DNA repeats; however, this suppression can be transiently released under prolonged heat stress. Here we show that the Arabidopsis thaliana imprinted gene SDC, which is silent during vegetative growth due to DNA methylation, is activated by heat and contributes to recovery from stress. SDC activation seems to involve epigenetic mechanisms but not canonical heat-shock perception and signaling. The heat-mediated transcriptional induction of SDC occurs particularly in young developing leaves and is proportional to the level of stress. However, this occurs only above a certain window of absolute temperatures and, thus, resembles a thermal-sensing mechanism. In addition, the re-silencing kinetics during recovery can be entrained by repeated heat stress cycles, suggesting that epigenetic regulation in plants may conserve memory of stress experience. We further demonstrate that SDC contributes to the recovery of plant biomass after stress. We propose that transcriptional gene silencing, known to be involved in gene imprinting, is also co-opted in the specific tuning of SDC expression upon heat stress and subsequent recovery. It is therefore possible that dynamic properties of the epigenetic landscape associated with silenced or imprinted genes may contribute to regulation of their expression in response to environmental challenges. Dewey 580 45 Département des sciences végétales 163 false PLOS genetics 10 11 00d73f15-8fcc-4809-a27d-56173ac5248c Article (Published version) Public Sanchez_PLoSGenet_2014.pdf 1129327 application/pdf openAccess Faculté des sciences / Section de biologie / Département des sciences végétales

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Heat-induced release of epigenetic silencing reveals the concealed role of an imprinted plant gene	PLOS genetics			2014	550	750

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Sanchez, Diego