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Poster De Conférence Année : 2019

Genome-wide hypermethylation of TEs and centromeres following low temperature exposure in B73

Jean-Philippe Pichon
  • Fonction : Auteur
Magalie Leveugle
  • Fonction : Auteur
Hervé Duborjal
  • Fonction : Auteur

Résumé

Transposable elements (TEs) are major players in shaping genome structure. TE sequences are transcriptionally silenced by epigenomic modifications to limit the mutagenic potential of their transpositional activity. In particular, several DNA methylation pathways are responsible for TE silencing in the various chromosomal locations where TE reside. While DNA methylation is known to be modified by abiotic constraints, the extent to which it can be remodeled remains to be fully elucidated. We show that low temperature triggers genome-wide hypermethylation in maize, mainly at transposable elements and centromeres. This hypermethylation is mediated by the parallel activation of multiple methylation pathways across chromosomes, to actively hypermethylate TEs in the various chromatin locations where they reside. This likely reflects the importance of taming transposable elements following an abiotic stress in maize, a species for which over 85% of the genome is constituted of transposable elements.
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Dates et versions

hal-04353514 , version 1 (19-12-2023)

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  • HAL Id : hal-04353514 , version 1

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Zeineb Achour, Johann Joets, Martine Leguilloux, Hélène Sellier, Jean-Philippe Pichon, et al.. Genome-wide hypermethylation of TEs and centromeres following low temperature exposure in B73. 61st Annual Maize Genetics Conference, Mar 2019, Saint Louis (Missouri), United States. ⟨hal-04353514⟩
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