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The Importance of Poly(ADP-Ribose) Polymerase as a Sensor of Unligated Okazaki Fragments during DNA Replication

Open access
Hanzlikova, Hana, Kalasova, Ilona, Demin, Annie A., Pennicott, Lewis E., Cihlarova, Zuzana, Caldecott, Keith W.·2018·Molecular Cell

Abstract

Poly(ADP-ribose) is synthesized by PARP enzymes during the repair of stochastic DNA breaks. Surprisingly, however, we show that most if not all endogenous poly(ADP-ribose) is detected in normal S phase cells at sites of DNA replication. This S phase poly(ADP-ribose) does not result from damaged or misincorporated nucleotides or from DNA replication stress. Rather, perturbation of the DNA replication proteins LIG1 or FEN1 increases S phase poly(ADP-ribose) more than 10-fold, implicating unligated Okazaki fragments as the source of S phase PARP activity. Indeed, S phase PARP activity is ablated by suppressing Okazaki fragment formation with emetine, a DNA replication inhibitor that selectively inhibits lagging strand synthesis. Importantly, PARP activation during DNA replication recruits the single-strand break repair protein XRCC1, and human cells lacking PARP activity and/or XRCC1 are hypersensitive to FEN1 perturbation. Collectively, our data indicate that PARP1 is a sensor of unligated Okazaki fragments during DNA replication and facilitates their repair.

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Metadata

Authors
Hanzlikova, H., Kalasova, I., Demin, A. A., Pennicott, L. E., Cihlarova, Z., & Caldecott, K. W.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2018-07
Volume
71
Issue
2
Pages
319-331.e3
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2852866740
Cited by
393
References
8
FWCI
10.36
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: The Importance of Poly(ADP-Ribose) Polymerase as a Sensor of Unligated Okazaki Fragments during DNA Replication. https://app.cochat.ai/papers/10.1016/j.molcel.2018.06.004
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Hanzlikova, H., Kalasova, I., Demin, A. A., Pennicott, L. E., Cihlarova, Z., & Caldecott, K. W. (2018). The Importance of Poly(ADP-Ribose) Polymerase as a Sensor of Unligated Okazaki Fragments during DNA Replication. Molecular Cell. https://doi.org/10.1016/j.molcel.2018.06.004

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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