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Genome-Wide CRISPR Screening Identifies BRD9 As a Druggable Component Of bioRxiv preprint doi: https://doi.org/10.1101/2021.02.04.429732; this version posted February 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 1 Genome-Wide CRISPR Screening Identifies BRD9 as a Druggable Component of 2 Interferon-Stimulated Gene Expression and Antiviral Activity 3 Jacob Börolda,b,†, Davide Elettoa,†,#, Idoia Busnadiegoa, Nina K. Maira,b, Eva Moritza, 4 Samira Schiefera,b, Nora Schmidta,$, Philipp P. Petricc,d, W. Wei-Lynn Wonge, Martin 5 Schwemmlec & Benjamin G. Halea,* 6 7 aInstitute of Medical Virology, University of Zurich, Zurich, Switzerland. 8 bLife Science Zurich Graduate School, ETH and University of Zurich, Zurich, 9 Switzerland. 10 cInstitute of Virology, Freiburg University Medical Center, Faculty of Medicine, University 11 of Freiburg, Freiburg, Germany. 12 dSpemann Graduate School of Biology and Medicine, University of Freiburg, Freiburg, 13 Germany. 14 eInstitute of Experimental Immunology, University of Zurich, Zurich, Switzerland. 15 *Correspondence: Benjamin G. Hale, [email protected] 16 †Equal first authors listed in alphabetical order. 17 #Present address: Department of Biosystems Science and Engineering, ETH Zurich, 18 Basel, Switzerland. 19 $Present address: Helmholtz Institute for RNA-based Infection Research, Helmholtz- 20 Center for Infection Research, Wurzburg, Germany. 1 bioRxiv preprint doi: https://doi.org/10.1101/2021.02.04.429732; this version posted February 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 21 ABSTRACT 22 Transient interferon (IFN) induction of IFN-stimulated genes (ISGs) creates a formidable 23 protective antiviral state. However, loss of appropriate control mechanisms can result in 24 constitutive pathogenic ISG upregulation. Here, we used genome-wide loss-of-function 25 screening to establish genes critical for IFN signaling, identifying all expected members 26 of the JAK-STAT pathway and the previously unappreciated bromodomain-containing 27 protein 9 (BRD9), a defining subunit of non-canonical BAF (ncBAF) chromatin 28 remodeling complexes. Genetic knock-out or small-molecule mediated degradation of 29 BRD9 limited IFN-induced expression of a subset of ISGs in multiple cell-types, and 30 prevented IFN from exerting full antiviral activity against several RNA and DNA viruses. 31 Mechanistically, BRD9 acts at the level of ISG transcription, exhibits a proximal 32 association with STAT2 following IFN stimulation, and relies on its intact acetyl-binding 33 bromodomain and unique ncBAF scaffolding function for activity. Given its druggability, 34 BRD9 may be an attractive target for dampening constitutive ISG expression under 35 certain pathogenic autoinflammatory conditions. 36 37 38 39 40 2 bioRxiv preprint doi: https://doi.org/10.1101/2021.02.04.429732; this version posted February 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 41 INTRODUCTION 42 The type I interferon (IFN-α/β) system is a key component of the human innate immune 43 response, and acts as a first line of defense against invading pathogens such as 44 viruses. At a general level, following host recognition of infection, secreted type I IFNs 45 relay signals to target cells via their binding to cognate cell surface receptors 46 (IFNAR1/IFNAR2) and the subsequent triggering of a well-defined phosphorylation- 47 activation JAK-STAT signaling cascade involving the Janus kinases (JAK1/TYK2) and 48 Signal Transducer and Activator of Transcription (STAT1/STAT2) proteins. Together 49 with IFN-regulatory factor 9 (IRF9), activated STAT1 and STAT2 form a heterotrimeric 50 transcription factor complex, termed ISGF3, that facilitates the transcription of hundreds 51 of antiviral IFN-stimulated genes (ISGs)1-3. The critical nature of the IFN system in 52 protecting humans against infection is exemplified by findings that some individuals with 53 genetic defects in IFN pathway components can exhibit severe, or even fatal, viral 54 diseases, particularly in the absence of pre-existing humoral immunity, as may be the 55 case in young infants or following infection with an antigenically-novel pandemic virus4,5. 56 It is essential that the IFN system is tightly regulated at the molecular level to prevent 57 exuberant proinflammatory responses following infection6-8. Furthermore, uncontrolled 58 activation of the IFN system caused by loss- or gain- of-function mutations in key 59 regulators of the IFN pathway can be associated with aberrantly high levels of 60 circulating IFNs and/or the constitutive expression of ISGs, leading to a broad range of 61 autoinflammatory disorders known as interferonopathies9-17. Proposed treatments for 62 interferonopathies include JAK inhibitors (such as baricitinib18, ruxolitinib19 or 3 bioRxiv preprint doi: https://doi.org/10.1101/2021.02.04.429732; this version posted February 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 63 tofacitinib20) to limit the signaling action of high levels of constitutively circulating IFN or 64 inappropriate JAK-STAT regulation. However, while effective in treating 65 interferonopathies, inhibiting critical components of the IFN signaling pathway can 66 increase patient susceptibility to some viral infections21,22. Therefore a nuanced 67 approach targeting factors involved in transcription of specific ISGs may be more 68 appropriate22. 69 In this study, we sought to leverage CRISPR/Cas9-mediated genome-wide loss-of- 70 function screening to interrogate the IFN signaling cascade and identify human host 71 factors required for ISG expression. Our screening results led us to focus on 72 Bromodomain-containing protein 9 (BRD9), a defining subunit of specific chromatin- 73 remodeling complexes23-25, which has not previously been implicated in IFN responses. 74 Many factors involved in transcriptional regulation via chromatin modification or 75 remodeling play important roles in STAT-mediated ISG expression22,26-39, and some 76 (such as histone deacetylases (HDACs) and bromodomain-containing proteins22,26,35,39) 77 can be targeted pharmacologically. Here, we provide evidence that BRD9 contributes to 78 the expression of a subset of ISGs (and thus the full antiviral action of IFN) via its 79 unique functions in non-canonical BAF (BRG1- or BRM- associated factor; ncBAF) 80 chromatin remodeling complexes. Importantly, this contribution of BRD9 is conserved 81 across numerous human cell types, including primary cells, and against multiple distinct 82 viruses. Moreover, BRD9 can be specifically targeted for degradation by small-molecule 83 compounds without impacting cell viability. Our data add mechanistic insights into 84 human factors required for the full activity of IFN, and suggest a plausible therapeutic 4 bioRxiv preprint doi: https://doi.org/10.1101/2021.02.04.429732; this version posted February 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 85 target to rationally temper detrimentally-high ISG levels in some autoinflammatory 86 disorders, including interferonopathies. 87 RESULTS 88 A Genome-Wide Loss-of-Function Screen Identifies Human Genes Important for 89 Interferon-Stimulated Gene Expression. The type I IFN signaling pathway leading to 90 induction of ISG expression is comprised of several canonical gene components, 91 including receptors (IFNAR1, IFNAR2), kinases (JAK1, TYK2), and transcription factors 92 (ISGF3: STAT1, STAT2, IRF9) (Figure 1A). To identify additional, previously 93 uncharacterized, genes critical for the ability of IFN to signal and induce ISG 94 expression, we performed a genome-wide FACS-based loss-of-function screen in the 95 human lung epithelial cell-line, A549. We used the GeCKOv2 CRISPR-Cas9 library, 96 which contains a total of 123,411 CRISPR single-guide RNAs (sgRNAs) targeting 97 19,050 genes in the human genome with 6 guide RNAs per gene40. First, we generated 98 a sub-clone of an A549-based reporter cell-line that expresses eGFP under control of 99 an IFN-stimulated response element (A549/pr(ISRE).eGFP.A1)41, and confirmed that 100 treatment of this sub-clone with IFN-α2 leads to high and homogenous expression of 101 eGFP, with clear separation of IFN-stimulated and non-stimulated cell populations in 102 flow cytometry analysis (Figure 1B). As a pre-screen validation, we next transduced 103 this reporter cell-line with all-in-one puromycin-resistant lentiviral vectors expressing 104 Cas9 and several control sgRNAs selected from the GeCKOv2 human library. Following 105 puromycin selection for 10 days to ensure protein depletion after CRISPR gene editing, 106 we observed that a significant proportion of reporter cells transduced with sgRNAs 5 bioRxiv preprint doi: https://doi.org/10.1101/2021.02.04.429732; this version posted February 4, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 107 targeting the canonical pathway components, IFNAR1 or STAT1, failed to express 108 eGFP in response to IFN-α2 stimulation (Figure 1C). As expected, reporter cells 109 transduced with an sgRNA targeting a non-pathway component, IFNLR1, responded 110 similarly to IFN-α2 stimulation as the parental cell-line (Figure 1C).
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