Planta Med 2021; 87(10/11): 868-878
DOI: 10.1055/a-1527-1435
Biological and Pharmacological Activity
Original Papers

Effects of Chemopreventive Natural Compounds on the Accuracy of 8-oxo-7,8-dihydro-2′-deoxyguanosine Translesion Synthesis[ # ]

1   Unit of Therapeutic Chemistry and Pharmacognosy, Research Institute for Health Sciences and Technology, University of Mons (UMONS), Mons, Belgium
,
Déborah Lanterbecq
2   Laboratory of Biotechnology and Applied Biology, Haute Ecole Provinciale de Hainaut CONDORCET, Ath, Belgium
,
Martin Spanoghe
2   Laboratory of Biotechnology and Applied Biology, Haute Ecole Provinciale de Hainaut CONDORCET, Ath, Belgium
,
Alexandra Belayew
3   Department of Metabolic and Molecular Biochemistry, Research Institute for Health Sciences and Technology, University of Mons (UMONS), Mons, Belgium
,
1   Unit of Therapeutic Chemistry and Pharmacognosy, Research Institute for Health Sciences and Technology, University of Mons (UMONS), Mons, Belgium
› Author Affiliations

Supported by: University of Mons Supported by: Foundation Plants for Health Award 2020
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Abstract

Translesion synthesis is a DNA damage tolerance mechanism that relies on a series of specialized DNA polymerases able to bypass a lesion on a DNA template strand during replication or post-repair synthesis. Specialized translesion synthesis DNA polymerases pursue replication by inserting a base opposite to this lesion, correctly or incorrectly depending on the lesion nature, involved DNA polymerase(s), sequence context, and still unknown factors. To measure the correct or mutagenic outcome of 8-oxo-7,8-dihydro-2′-deoxyguanosine bypass by translesion synthesis, a primer-extension assay was performed in vitro on a template DNA bearing this lesion in the presence of nuclear proteins extracted from human intestinal epithelial cells (FHs 74 Int cell line); the reaction products were analyzed by both denaturing capillary electrophoresis (to measure the yield of translesion elongation) and pyrosequencing (to determine the identity of the nucleotide inserted in front of the lesion). The influence of 14 natural polyphenols on the correct or mutagenic outcome of translesion synthesis through 8-oxo-7,8-dihydro-2′-deoxyguanosine was then evaluated in 2 experimental conditions by adding the polyphenol either (i) to the reaction mix during the primer extension assay; or (ii) to the culture medium, 24 h before cell harvest and nuclear proteins extraction. Most of the tested polyphenols significantly influenced the outcome of translesion synthesis, either through an error-free (apigenin, baicalein, sakuranetin, and myricetin) or a mutagenic pathway (epicatechin, chalcone, genistein, magnolol, and honokiol).

# Dedicated to Professor Arnold Vlietinck on the occasion of his 80th birthday.


Supporting Information



Publication History

Received: 26 December 2020

Accepted after revision: 07 June 2021

Article published online:
08 July 2021

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