Distinct roles for DNA-PK, ATM and ATR in RPA phosphorylation and checkpoint activation in response to replication stress

Shengqin Liu, Stephen O. Opiyo, Karoline Manthey, Jason G. Glanzer, Amanda K. Ashley, Courtney Amerin, Kyle Troksa, Meena Shrivastav, Jac A. Nickoloff, Gregory G Oakley

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

DNA damage encountered by DNA replication forks poses risks of genome destabilization, a precursor to carcinogenesis. Damage checkpoint systems cause cell cycle arrest, promote repair and induce programed cell death when damage is severe. Checkpoints are critical parts of the DNA damage response network that act to suppress cancer. DNA damage and perturbation of replication machinery causes replication stress, characterized by accumulation of single-stranded DNA bound by replication protein A (RPA), which triggers activation of ataxia telangiectasia and Rad3 related (ATR) and phosphorylation of the RPA32, subunit of RPA, leading to Chk1 activation and arrest. DNA-dependent protein kinase catalytic subunit (DNA-PKcs) [a kinase related to ataxia telangiectasia mutated (ATM) and ATR] has well characterized roles in DNA double-strand break repair, but poorly understood roles in replication stress-induced RPA phosphorylation. We show that DNA-PKcs mutant cells fail to arrest replication following stress, and mutations in RPA32 phosphorylation sites targeted by DNA-PKcs increase the proportion of cells in mitosis, impair ATR signaling to Chk1 and confer a G2/M arrest defect. Inhibition of ATR and DNA-PK (but not ATM), mimic the defects observed in cells expressing mutant RPA32. Cells expressing mutant RPA32 or DNA-PKcs show sustained H2AX phosphorylation in response to replication stress that persists in cells entering mitosis, indicating inappropriate mitotic entry with unrepaired damage.

Original languageEnglish (US)
Pages (from-to)10780-10794
Number of pages15
JournalNucleic acids research
Volume40
Issue number21
DOIs
StatePublished - Nov 1 2012

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Replication Protein A
Ataxia Telangiectasia
DNA-Activated Protein Kinase
Phosphorylation
DNA
Catalytic Domain
DNA Damage
DNA Replication
Mitosis
Double-Stranded DNA Breaks
Single-Stranded DNA
Cell Cycle Checkpoints
Carcinogenesis
Cell Death
Phosphotransferases
Genome
Mutation

ASJC Scopus subject areas

  • Genetics

Cite this

Distinct roles for DNA-PK, ATM and ATR in RPA phosphorylation and checkpoint activation in response to replication stress. / Liu, Shengqin; Opiyo, Stephen O.; Manthey, Karoline; Glanzer, Jason G.; Ashley, Amanda K.; Amerin, Courtney; Troksa, Kyle; Shrivastav, Meena; Nickoloff, Jac A.; Oakley, Gregory G.

In: Nucleic acids research, Vol. 40, No. 21, 01.11.2012, p. 10780-10794.

Research output: Contribution to journalArticle

Liu, S, Opiyo, SO, Manthey, K, Glanzer, JG, Ashley, AK, Amerin, C, Troksa, K, Shrivastav, M, Nickoloff, JA & Oakley, GG 2012, 'Distinct roles for DNA-PK, ATM and ATR in RPA phosphorylation and checkpoint activation in response to replication stress', Nucleic acids research, vol. 40, no. 21, pp. 10780-10794. https://doi.org/10.1093/nar/gks849
Liu, Shengqin ; Opiyo, Stephen O. ; Manthey, Karoline ; Glanzer, Jason G. ; Ashley, Amanda K. ; Amerin, Courtney ; Troksa, Kyle ; Shrivastav, Meena ; Nickoloff, Jac A. ; Oakley, Gregory G. / Distinct roles for DNA-PK, ATM and ATR in RPA phosphorylation and checkpoint activation in response to replication stress. In: Nucleic acids research. 2012 ; Vol. 40, No. 21. pp. 10780-10794.
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AU - Ashley, Amanda K.

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