Flap endonuclease overexpression drives genome instability and DNA damage hypersensitivity in a PCNA-dependent manner.

Abstract:

:Overexpression of the flap endonuclease FEN1 has been observed in a variety of cancer types and is a marker for poor prognosis. To better understand the cellular consequences of FEN1 overexpression we utilized a model of its Saccharomyces cerevisiae homolog, RAD27. In this system, we discovered that flap endonuclease overexpression impedes replication fork progression and leads to an accumulation of cells in mid-S phase. This was accompanied by increased phosphorylation of the checkpoint kinase Rad53 and histone H2A-S129. RAD27 overexpressing cells were hypersensitive to treatment with DNA damaging agents, and defective in ubiquitinating the replication clamp proliferating cell nuclear antigen (PCNA) at lysine 164. These effects were reversed when the interaction between overexpressed Rad27 and PCNA was ablated, suggesting that the observed phenotypes were linked to problems in DNA replication. RAD27 overexpressing cells also exhibited an unexpected dependence on the SUMO ligases SIZ1 and MMS21 for viability. Importantly, we found that overexpression of FEN1 in human cells also led to phosphorylation of CHK1, CHK2, RPA32 and histone H2AX, all markers of genome instability. Our data indicate that flap endonuclease overexpression is a driver of genome instability in yeast and human cells that impairs DNA replication in a manner dependent on its interaction with PCNA.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Becker JR,Gallo D,Leung W,Croissant T,Thu YM,Nguyen HD,Starr TK,Brown GW,Bielinsky AK

doi

10.1093/nar/gky313

subject

Has Abstract

pub_date

2018-06-20 00:00:00

pages

5634-5650

issue

11

eissn

0305-1048

issn

1362-4962

pii

4993325

journal_volume

46

pub_type

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