Screen identifies bromodomain protein ZMYND8 in chromatin recognition of transcription-associated DNA damage that promotes homologous recombination

Gong, Fade; Chiu, Li Ya; Cox, Ben D.; Aymard, François; Clouaire, Thomas; Leung, Justin; Cammarata, Michael B.; Perez, Mercedes; Agarwal, Poonam; Brodbelt, Jennifer S.; Legube, Gaëlle; Miller, Kyle M.

doi:10.1101/gad.252189.114

Cited by 225 publications

(356 citation statements)

References 72 publications

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“…In contrast, by examining multiple endogenous cut sites, Aymard et al found a significant increase in HR when DSBs were located in euchromatic regions and/or next to actively transcribed genes (70). Similar results were also reported by Gong et al (71). While our study does not directly address repair pathway choice for DSBs, we do show an association between DDX1 and efficient repair by HR that is linked to transcription and the presence of RNA at DSBs.…”

Section: Discussionsupporting

confidence: 46%

DEAD Box 1 Facilitates Removal of RNA and Homologous Recombination at DNA Double-Strand Breaks

Germain

Poon

et al. 2016

Molecular and Cellular Biology

133

138

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Although RNA and RNA-binding proteins have been linked to double-strand breaks (DSBs), little is known regarding their roles in the cellular response to DSBs and, if any, in the repair process. Here, we provide direct evidence for the presence of RNA-DNA hybrids at DSBs and suggest that binding of RNA to DNA at DSBs may impact repair efficiency. Our data indicate that the RNAunwinding protein DEAD box 1 (DDX1) is required for efficient DSB repair and cell survival after ionizing radiation (IR), with depletion of DDX1 resulting in reduced DSB repair by homologous recombination (HR). While DDX1 is not essential for end resection, a key step in homology-directed DSB repair, DDX1 is required for maintenance of the single-stranded DNA once generated by end resection. We show that transcription deregulation has a significant effect on DSB repair by HR in DDX1-depleted cells and that RNA-DNA duplexes are elevated at DSBs in DDX1-depleted cells. Based on our combined data, we propose a role for DDX1 in resolving RNA-DNA structures that accumulate at DSBs located at sites of active transcription. Our findings point to a previously uncharacterized requirement for clearing RNA at DSBs for efficient repair by HR. DEAD box proteins are a family of putative RNA helicases that function by altering RNA secondary structure. This protein family has been implicated in all aspects of RNA metabolism. The DEAD box 1 gene (DDX1) is a widely expressed gene that is misexpressed in a number of cancers, including retinoblastoma, neuroblastoma, and breast cancer (1, 2). Knockout of DDX1 leads to early embryonic lethality in mice and severely reduced fertility in flies (3, 4). DDX1 is involved in the transport of RNAs from the nucleus to the cytoplasm and regulates cytoplasmic localization of the splicing-regulatory protein KSRP (5). In neurons, DDX1 resides in RNA-transporting granules, cytoplasmic organelles that regulate the localization and expression of target mRNAs (6, 7). DDX1 has also been identified as a core subunit of the human tRNA ligase complex which is essential for tRNA splicing (8).In addition to its roles in RNA metabolism, DDX1 has been implicated in the cellular response to DNA double-strand breaks (DSBs). Upon treatment of cells with ionizing radiation (IR), DDX1 rapidly accumulates at a subset of DNA DSBs (ϳ30%), where it forms IR-induced foci that colocalize with ␥-H2AX, a marker for DSBs (9). DDX1 coimmunoprecipitates with the MRN (MRE11-RAD50-NBS1) complex, the early sensor of DNA DSBs, and ATM (ataxia telangiectasia mutated) protein, the key transducer of the signaling cascade in response to DSBs (10, 11). DSBs induce DDX1 phosphorylation in an ATM-dependent manner. Notably, IR-induced DDX1 foci are lost when cells are treated with RNase H, an enzyme that specifically digests RNA from RNA-DNA hybrids (9). These results suggest that RNA-DNA double-stranded structures are required for the presence and/or retention of DDX1 at DSBs. In line with this observation, biochemical analysis has shown that DDX1 can unwind both...

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Section: Discussionsupporting

confidence: 46%

DEAD Box 1 Facilitates Removal of RNA and Homologous Recombination at DNA Double-Strand Breaks

Germain

Poon

et al. 2016

Molecular and Cellular Biology

133

138

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“…Previous studies have reported that ZMYND8 is a functional component of the transcription repression complex NuRD (58,59) and targets it to the DNA damage response site (23). CHD3/4 is responsible for the ATPdependent chromatin remodeling function of NuRD (35,60).…”

Section: Discussionmentioning

confidence: 99%

“…It has been reported as a novel DNA damage response factor that recruits NuRD complex to damaged chromatin (23). Its involvement in chromatin template-dependent processes, viz.…”

Section: Zmynd8 Is a Histone H3/h4-interacting Protein-mentioning

confidence: 99%

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Selective Recognition of H3.1K36 Dimethylation/H4K16 Acetylation Facilitates the Regulation of All-trans-retinoic Acid (ATRA)-responsive Genes by Putative Chromatin Reader ZMYND8

Adhikary

Sanyal

Basu

et al. 2016

Journal of Biological Chemistry

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ZMYND8 (zinc finger MYND (Myeloid, Nervy and DEAF-1)-type containing 8), a newly identified component of the transcriptional coregulator network, was found to interact with the Nucleosome Remodeling and Deacetylase (NuRD) complex. Previous reports have shown that ZMYND8 is instrumental in recruiting the NuRD complex to damaged chromatin for repressing transcription and promoting double strand break repair by homologous recombination. However, the mode of transcription regulation by ZMYND8 has remained elusive. Here, we report that through its specific key residues present in its conserved chromatin-binding modules, ZMYND8 interacts with the selective epigenetic marks H3.1K36Me2/H4K16Ac. Furthermore, ZMYND8 shows a clear preference for canonical histone H3.1 over variant H3.3. Interestingly, ZMYND8 was found to be recruited to several developmental genes, including the all-trans-retinoic acid (ATRA)-responsive ones, through its modified histone-binding ability. Being itself inducible by ATRA, this zinc finger transcription factor is involved in modulating other ATRA-inducible genes. We found that ZMYND8 interacts with transcription initiation-competent RNA polymerase II phosphorylated at Ser-5 in a DNA templatedependent manner and can alter the global gene transcription. Overall, our study identifies that ZMYND8 has CHD4-independent functions in regulating gene expression through its modified histone-binding ability.ZMYND8 (zinc finger MYND (Myeloid, Nervy and DEAF-1)-type containing 8) is a putative chromatin reader/effector harboring a PWWP domain, a bromodomain, and a PHD type zinc finger. It associates with the CHD4 protein of NuRD chromatin remodeling complex implicated in gene transcription, cell cycle progression, and genome integrity (1, 2). Reader proteins specifically recognize histone post-translational modifications (PTMs) 5 and translate such recognition(s) into meaningful biological outcomes by virtue of either their intrinsic activities or those of their interacting partners (3). These readers may interpret histone PTMs via "monovalent" or "multivalent" recognition (4). In monovalent recognition, a chromatin reader recognizes one histone PTM. In contrast, in multivalent recognition, readers recognize multiple histone modifications intra/inter-nucleosomally. An accessible surface is provided by these readers (such as a cavity or surface groove), which accommodates the modified histone residues, and determines the modification (e.g. acetylation versus methylation) or state specificity (such as mono-versus trimethylation of lysine) (3).ZMYND8 is a well known component of the transcription coregulator complex and is associated with several demethylase machinery components, including KDM5A, KDM5C, or LSD1 (5, 6). Through its ability to interact with Xenopus RCoR2, ZMYND8 plays a significant role in embryonic neural differentiation (7). Apart from this, ZMYND8 is also involved in T-cell lymphoma and breast and cervical cancer (8 -10). Another interesting feature is that ZMYND8 is significantly involved...

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“…5), including with ZMYND8, ZNF687, ZNF592, and BRD4. These proteins were also linked to ZNF532 in data from previous mass spectrometric analyses (26)(27)(28). Interestingly, the ZMYND8 locus, encoding a top interactor of ZNF532, is bound by NUT-fusion proteins in all NMC lines tested (selected examples are shown in Fig.…”

Section: Znf532-nut Forms Megadomains Of Hyperacetylated Chromatinmentioning

confidence: 99%

Ectopic protein interactions within BRD4–chromatin complexes drive oncogenic megadomain formation in NUT midline carcinoma

Alekseyenko

Walsh

Zee

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

111

167

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To investigate the mechanism that drives dramatic mistargeting of active chromatin in NUT midline carcinoma (NMC), we have identified protein interactions unique to the BRD4-NUT fusion oncoprotein compared with wild-type BRD4. Using cross-linking, affinity purification, and mass spectrometry, we identified the EP300 acetyltransferase as uniquely associated with BRD4 through the NUT fusion in both NMC and non-NMC cell types. We also discovered ZNF532 associated with BRD4-NUT in NMC patient cells but not detectable in 293T cells. EP300 and ZNF532 are both implicated in feed-forward regulatory loops leading to propagation of the oncogenic chromatin complex in BRD4-NUT patient cells. Adding key functional significance to our biochemical findings, we independently discovered a ZNF532-NUT translocation fusion in a newly diagnosed NMC patient. ChIP sequencing of the major players NUT, ZNF532, BRD4, EP300, and H3K27ac revealed the formation of ZNF532-NUT-associated hyperacetylated megadomains, distinctly localized but otherwise analogous to those found in BRD4-NUT patient cells. Our results support a model in which NMC is dependent on ectopic NUT-mediated interactions between EP300 and components of BRD4 regulatory complexes, leading to a cascade of misregulation.BioTAP-XL | hyperacetylation | ZNF532-NUT | topological domains | BRD4

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Screen identifies bromodomain protein ZMYND8 in chromatin recognition of transcription-associated DNA damage that promotes homologous recombination

Cited by 225 publications

References 72 publications

DEAD Box 1 Facilitates Removal of RNA and Homologous Recombination at DNA Double-Strand Breaks

DEAD Box 1 Facilitates Removal of RNA and Homologous Recombination at DNA Double-Strand Breaks

Selective Recognition of H3.1K36 Dimethylation/H4K16 Acetylation Facilitates the Regulation of All-trans-retinoic Acid (ATRA)-responsive Genes by Putative Chromatin Reader ZMYND8

Ectopic protein interactions within BRD4–chromatin complexes drive oncogenic megadomain formation in NUT midline carcinoma

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