Abstract:
BACKGROUND:Chromatin organizes DNA and regulates its transcriptional activity through epigenetic modifications. Heterochromatic regions of the genome are generally transcriptionally silent, while euchromatin is more prone to transcription. During DNA replication, both genetic information and chromatin modifications must be faithfully passed on to daughter strands. There is evidence that DNA polymerases play a role in transcriptional silencing, but the extent of their contribution and how it relates to heterochromatin maintenance is unclear. RESULTS:We isolate a strong hypomorphic Arabidopsis thaliana mutant of the POL2A catalytic subunit of DNA polymerase epsilon and show that POL2A is required to stabilize heterochromatin silencing genome-wide, likely by preventing replicative stress. We reveal that POL2A inhibits DNA methylation and histone H3 lysine 9 methylation. Hence, the release of heterochromatin silencing in POL2A-deficient mutants paradoxically occurs in a chromatin context of increased levels of these two repressive epigenetic marks. At the nuclear level, the POL2A defect is associated with fragmentation of heterochromatin. CONCLUSION:These results indicate that POL2A is critical to heterochromatin structure and function, and that unhindered replisome progression is required for the faithful propagation of DNA methylation throughout the cell cycle.
journal_name
Genome Bioljournal_title
Genome biologyauthors
Bourguet P,López-González L,Gómez-Zambrano Á,Pélissier T,Hesketh A,Potok ME,Pouch-Pélissier MN,Perez M,Da Ines O,Latrasse D,White CI,Jacobsen SE,Benhamed M,Mathieu Odoi
10.1186/s13059-020-02190-1subject
Has Abstractpub_date
2020-11-25 00:00:00pages
283issue
1eissn
1474-7596issn
1474-760Xpii
10.1186/s13059-020-02190-1journal_volume
21pub_type
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