Proteomics

Dataset Information

383

Proteomic and cellular responses against mutagenesis


ABSTRACT: Endogenous stress represents a major source of genome instability, but is in essence difficult to apprehend. Incorporation of labeled radionuclides into DNA constitutes a tractable model to analyze cellular responses to endogenous attacks. Here we show that incorporation of [3H]thymidine into CHO hamster cells generates oxidative-induced mutagenesis, but, with a peak at low doses. Proteomic analysis showed that the cellular global response differs between low and high levels of endogenous stress. In particular, these results confirmed the involvement of proteins implicated in redox homeostasis and DNA damage signaling pathways. Induced-mutagenesis was abolished by the anti-oxidant N-acetyl cysteine and plateaued, at high doses, upon exposure to L-buthionine sulfoximine, which represses cellular detoxification. The [3H]thymidine-induced mutation spectrum revealed mostly base substitutions, exhibiting a signature specific for low doses (GC>CG and AT>CG). Consistently, the enzymatic activity of the base excision repair protein APE-1 is induced at only medium or high doses. Collectively, the data reveal that a threshold of endogenous stress must be reached to trigger cellular detoxification and DNA repair programs; below this threshold, the consequences of endogenous stress escape cellular surveillance, leading to high levels of mutagenesis. Therefore, low doses of endogenous local stress can jeopardize genome integrity more efficiently than higher doses.

INSTRUMENT(S): maXis

ORGANISM(S): Cricetulus griseus  

TISSUE(S): Cell Culture

DISEASE(S): Malignant Neoplasm Of Ovary

SUBMITTER: sonia hem  

LAB HEAD: Bernard S. Lopez

PROVIDER: PXD003542 | Pride | 2016-07-15

REPOSITORIES: Pride

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Publications

A threshold of endogenous stress is required to engage cellular response to protect against mutagenesis.

Saintigny Yannick Y   Chevalier François F   Bravard Anne A   Dardillac Elodie E   Laurent David D   Hem Sonia S   Dépagne Jordane J   Radicella J Pablo JP   Lopez Bernard S BS  

Scientific reports 20160711


Endogenous stress represents a major source of genome instability, but is in essence difficult to apprehend. Incorporation of labeled radionuclides into DNA constitutes a tractable model to analyze cellular responses to endogenous attacks. Here we show that incorporation of [(3)H]thymidine into CHO cells generates oxidative-induced mutagenesis, but, with a peak at low doses. Proteomic analysis showed that the cellular response differs between low and high levels of endogenous stress. In particul  ...[more]

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