Role of the Polymerase ϵ sub-unit DPB2 in DNA replication, cell cycle regulation and DNA damage response in Arabidopsis

José Antonio Pedroza-Garcia, Séverine Domenichini, Christelle Mazubert, Mickael Bourge, Charles White, Elodie Hudik, Rémi Bounon, Zakia Tariq, Etienne Delannoy, Ivan Del Olmo, Manuel Piñeiro, Jose Antonio Jarillo, Catherine Bergounioux, Moussa Benhamed, Cécile Raynaud*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Faithful DNA replication maintains genome stability in dividing cells and from one generation to the next. This is particularly important in plants because the whole plant body and reproductive cells originate from meristematic cells that retain their proliferative capacity throughout the life cycle of the organism. DNA replication involves large sets of proteins whose activity is strictly regulated, and is tightly linked to the DNA damage response to detect and respond to replication errors or defects. Central to this interconnection is the replicative polymerase DNA Polymerase ϵ (Pol ϵ) which participates in DNA replication per se, as well as replication stress response in animals and in yeast. Surprisingly, its function has to date been little explored in plants, and notably its relationship with DNA Damage Response (DDR) has not been investigated. Here, we have studied the role of the largest regulatory sub-unit of Arabidopsis DNA Pol ϵ: DPB2, using an over-expression strategy. We demonstrate that excess accumulation of the protein impairs DNA replication and causes endogenous DNA stress. Furthermore, we show that Pol ϵ dysfunction has contrasting outcomes in vegetative and reproductive cells and leads to the activation of distinct DDR pathways in the two cell types.

Original languageEnglish (US)
Pages (from-to)7251-7266
Number of pages16
Issue number15
StatePublished - Sep 6 2016

ASJC Scopus subject areas

  • Genetics


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