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TIP60 recruits SUV39H1 to chromatin to maintain heterochromatin genome stability and resist hydrogen peroxide-induced cytotoxicity

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A Correction to this article was published on 20 November 2020

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Abstract

Tat interacting protein 60 (TIP60) is a histone acetyltransferase involved in chromatin remodeling and the DNA damage response. However, the role of TIP60 in maintaining genome stability is poorly understood. Here, we show that TIP60 can directly interact with suppressor of variegation 3–9 homologue 1 (SUV39H1), a methyltransferase that is responsible for histone H3 tri-methylation on Lys9 (H3K9me3). When we knocked down TIP60 or treated cells with hydrogen peroxide, a typical reactive oxygen species (ROS) generator that induces genome instability, SUV39H1 dissociated from chromatin but its acetylation levels remained unchanged. Consequently, H3K9me3 levels in the heterochromatin decreased, leading to a significant increase in the expression of satellite 2 (Sat2) and α-satellite (α-Sat), indicators of heterochromatin relaxation. Micrococcal nuclease sensitivity and colony formation assays further demonstrated that TIP60 knockdown or hydrogen peroxide treatment resulted in a relaxing of the heterochromatin and genome instability. Exogenous TIP60 could rescue the assembly of SUV39H1 on chromatin and ensure genome stability in response to hydrogen peroxide. This study is the first to describe a role for TIP60 in maintaining heterochromatin structure and genome stability by recruiting SUV39H1 to the chromatin upon oxidative stress, presenting TIP60 as a promising target to sensitize cancer cells to ROS-promoting therapies.

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  • 20 November 2020

    The original version of this article, published on November 6, 2020, contained a mistake.

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Acknowledgements

The authors would like to thank Professor Lin Shengcai for gifting the FLAG-TIP60 HAT-deficient mutant expression vector and HepG2 cells. We also thank Dr. Jessica Tamanini of ETediting, Shenzhen University for language editing. The authors would like to recognize that there are many other valuable papers that could have been included in this study, but space limitations prevented them all from being cited.

Funding

This work was supported by National Key R&D Program of China [2017YFA0503900]; National Natural Science Foundation of China [81720108027, 81530074]; Science and Technology Program of Guangdong Province in China [2017B030301016]; Shenzhen Municipal Commission of Science and Technology Innovation [JCYJ20170818092450901]; Discipline Construction Funding of Shenzhen [(2016)1452]; Shenzhen Bay Laboratory [SZBL2019062801011].

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Contributions

Experiments and data analysis were carried out by BT and YB; The study was conceived by W-GZ with intellectual contributions from QZ, XL, HW, TH, YZ and PZ; All authors contributed to writing and editing of the manuscript and have approved the final submission.

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Correspondence to Ping Zhang or Wei-Guo Zhu.

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The authors declare no competing financial interests.

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Additional information

The original online version of this article was revised: The original version of this article, published on November 6, 2020, contained a mistake. The list of corresponding authors was incorrect.

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Tu, B., Bao, Y., Tang, M. et al. TIP60 recruits SUV39H1 to chromatin to maintain heterochromatin genome stability and resist hydrogen peroxide-induced cytotoxicity. GENOME INSTAB. DIS. 1, 339–355 (2020). https://doi.org/10.1007/s42764-020-00025-8

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  • DOI: https://doi.org/10.1007/s42764-020-00025-8

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