epigenetic regulation of gene expression and transposable element activity.
Gene silencing refers to the repression of genes through epigenetic mechanisms, without altering the DNA sequence. In both plants and animals, gene silencing is tightly associated with modifications to chromatin, such as cytosine DNA methylation and particular post-translational modification of histone proteins. Gene silencing does not only affect exogenous DNA entering the genome, such as viral sequences, but also endogenous genomic sequences such as certain protein-coding genes and most transposons. Efficient and accurate gene silencing is therefore essential for proper gene expression and genome stability. Our research combines genetic and genomic approaches to understand the mechanisms of gene silencing, primarily using the flowering plant Arabidopsis as a model.
In eukaryotic organisms, the genome is packaged in the form of chromatin, which is composed of DNA molecules and various proteins, including histones. The structure of chromatin, including its chemical composition and degree of compaction, plays a critical role in the regulation of gene expression. This structure is influenced by the types of proteins present, such as different histone variants, as well as by chemical modifications, known as “epigenetic marks,” on both the DNA and histones.
Our research focuses on understanding the molecular mechanisms of epigenetic silencing. We use genetic and genomic approaches to analyze the pathways controlling the genomic distribution of different epigenetic marks and their interactions. Additionally, we study the molecular pathways involved in silencing transposable elements and certain genes, with a particular interest in DNA methylation-independent silencing mechanisms. Our goal is to uncover the fundamental mechanisms that control gene expression and genome stability through chromatin structure and epigenetic regulation.
Amy Hesketh (2017-2021)
Pierre Bourguet (2014-2018)
Maxime Auzon-Cape (2013-2017)
Mélanie Rigal (2010-2014)
Sébastien Lageix (2014-2015)
Romain Pogorelcnik (2013-2015)
Angeles Gomez Zambrano (2013-2015)
Leticia Lopez Gonzalez (2012-2014)
Stève de Bossoreille de Ribou (2012-2014)
Anthony Devert (2012-2013)
Yoko Ikeda (2011-2013)
Zoltan Kevei (2010-2013)
Published on 30 Jun 2021 in PLoS genetics , vol. 17 - pp e1009601
The histone variant H2A.W and linker histone H1 co-regulate heterochromatin accessibility and DNA methylation.
Published on 11 May 2021 in Nature communications , vol. 12 - pp 2683
Published on 25 Nov 2020 in Genome biology , vol. 21 - pp 283
Published on 30 May 2020 in The Plant journal : for cell and molecular biology , vol. 102 - pp 703-717
Published on 30 Dec 2018 in Life science alliance , vol. 1 - pp e201800197
Loss of CG Methylation in Marchantia polymorpha Causes Disorganization of Cell Division and Reveals Unique DNA Methylation Regulatory Mechanisms of Non-CG Methylation.
Published on 01 Dec 2018 in Plant & cell physiology , vol. 59 - pp 2421-2431
Ikeda Y, Nishihama R, Yamaoka S, Arteaga-Vazquez MA, Aguilar-Cruz A, Grimanelli D, Pogorelcnik R, Martienssen RA, Yamato KT, Kohchi T, Hirayama T, Mathieu O
Evolutionary history of double-stranded RNA binding proteins in plants: identification of new cofactors involved in easiRNA biogenesis.
Published on 30 May 2016 in Plant molecular biology , vol. 91 - pp 131-47
Epigenome confrontation triggers immediate reprogramming of DNA methylation and transposon silencing in Arabidopsis thaliana F1 epihybrids.
Published on 05 Apr 2016 in Proceedings of the National Academy of Sciences of the United States of America , vol. 113 - pp E2083-92
Published on 03 Mar 2015 in BMC plant biology , vol. 15 - pp 70
Clavel M, Pélissier T , Descombin J, Jean V, Picart C, Charbonel C, Saez-Vásquez J, Bousquet-Antonelli C, Deragon JM
DNA methylation in an intron of the IBM1 histone demethylase gene stabilizes chromatin modification patterns.
Published on 29 Jun 2012 in The EMBO journal , vol. 31 - pp 2981-93
Double-stranded RNA binding proteins DRB2 and DRB4 have an antagonistic impact on polymerase IV-dependent siRNA levels in Arabidopsis.
Published on 30 Aug 2011 in RNA (New York, N.Y.) , vol. 17 - pp 1502-10
Published on 12 Aug 2011 in Biochimica et biophysica acta , vol. 1809 - pp 452-8
Rigal M, Mathieu O
Published on 17 Sep 2009 in Nature , vol. 461 - pp 423-6
Tsukahara S, Kobayashi A, Kawabe A, Mathieu O , Miura A, Kakutani T
Published on 17 Sep 2009 in Nature , vol. 461 - pp 427-30
Mirouze M, Reinders J, Bucher E, Nishimura T, Schneeberger K, Ossowski S, Cao J, Weigel D, Paszkowski J, Mathieu O
Arabidopsis eIF2alpha kinase GCN2 is essential for growth in stress conditions and is activated by wounding.
Published on 24 Dec 2008 in BMC plant biology , vol. 8 - pp 134
Divergent evolution of CHD3 proteins resulted in MOM1 refining epigenetic control in vascular plants.
Published on 22 Aug 2008 in PLoS genetics , vol. 4 - pp e1000165
Caikovski M, Yokthongwattana C, Habu Y, Nishimura T, Mathieu O , Paszkowski J
SINE RNA induces severe developmental defects in Arabidopsis thaliana and interacts with HYL1 (DRB1), a key member of the DCL1 complex.
Published on 13 Jun 2008 in PLoS genetics , vol. 4 - pp e1000096