{"gene":"PARP9","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2000,"finding":"BAL (PARP9) is a novel nuclear protein that promotes B-cell migration; stable BAL-overexpressing B-cell lymphoma transfectants showed significantly higher rates of migration in transwell assays compared to vector-only transfectants.","method":"Stable transfection overexpression with transwell migration assay","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single functional assay in cell line, single lab, but direct loss/gain-of-function with specific phenotypic readout","pmids":["11110709"],"is_preprint":false},{"year":2003,"finding":"BAL (PARP9) binds BBAP (DTX3L) via yeast two-hybrid interaction; DTX3L/BBAP functions as an E3 ubiquitin ligase capable of self-ubiquitination, and heterodimerizes with BAL/PARP9 to modify E3 activity and/or substrate availability.","method":"Yeast two-hybrid screen, in vitro self-ubiquitination assay, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interactions shown, E3 activity demonstrated biochemically, single lab","pmids":["12670957"],"is_preprint":false},{"year":2006,"finding":"BAL1/PARP9 and BBAP/DTX3L are regulated by a shared IFN-γ-responsive bidirectional promoter on chromosome 3q21; IFN-γ induces BAL1 expression, and doxycycline-induced BAL1 increases expression of multiple IFN-stimulated genes, directly implicating BAL1 in an IFN signaling pathway. BBAP regulates the subcellular localization of BAL1 by a dynamic shuttling mechanism.","method":"Reporter assay for bidirectional promoter, doxycycline-inducible overexpression with gene expression profiling, live-cell imaging of subcellular localization","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (promoter assay, inducible OE, localization), single lab","pmids":["16809771"],"is_preprint":false},{"year":2008,"finding":"Parp-9 (PARP9) is developmentally regulated and prominently expressed in thymus, specific brain regions, gut, and intestine in mice; Bbap/DTX3L is essentially coexpressed with Parp-9 during development and in adult mouse tissues, consistent with co-regulation from their shared promoter.","method":"In situ hybridization and tissue expression analysis during mouse development and adulthood","journal":"Developmental dynamics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — descriptive expression pattern, single lab, no functional perturbation","pmids":["18069692"],"is_preprint":false},{"year":2012,"finding":"BAL1/PARP9 is recruited to DNA damage sites in a PARP1/poly(ADP-ribose)-dependent manner via its macrodomains, and together with its partner BBAP/DTX3L promotes local ubiquitylation, 53BP1 and BRCA1 recruitment, and double-strand break repair independent of ATM, MDC1, and RNF8.","method":"Live-cell imaging of GFP-tagged proteins at laser-induced DNA damage, PARP1 inhibitor treatment, siRNA knockdown with γH2AX quantification, chromatin fractionation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (live imaging, inhibitor, KD, fractionation), direct functional consequence on DNA repair demonstrated","pmids":["23230272"],"is_preprint":false},{"year":2013,"finding":"BAL1/ARTD9/PARP9 physically interacts with STAT1α and STAT1β through its macrodomains in an ADP-ribosylation-dependent manner; it stimulates phosphorylation of both STAT1 isoforms on Y701, promotes nuclear accumulation of transcriptionally repressive STAT1β, and directly inhibits IRF1 expression together with STAT1β, while enhancing expression of proto-oncogenes IRF2 and BCL6 in DLBCL.","method":"Co-immunoprecipitation, Western blot for phosphorylation, immunofluorescence for nuclear localization, knockdown/overexpression with gene expression analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, multiple readouts, single lab","pmids":["23487038"],"is_preprint":false},{"year":2014,"finding":"DTX3L (BBAP) and ARTD9/PARP9 form a complex together and also with ARTD8/PARP14 in metastatic prostate cancer cells; DTX3L and ARTD9/PARP9 act together as repressors of the tumor suppressor IRF1, and together with STAT1 and STAT3, DTX3L is implicated in cell migration. Co-immunoprecipitation confirmed physical interactions between DTX3L, ARTD8, and ARTD9.","method":"Co-immunoprecipitation, siRNA knockdown with proliferation/survival/migration assays, real-time RT-PCR, Western blot, immunofluorescence","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus multiple functional readouts, single lab","pmids":["24886089"],"is_preprint":false},{"year":2015,"finding":"PARP9 forms a complex with DTX3L that acts as an E3 ubiquitin ligase targeting host histone H2BJ to promote interferon-stimulated gene expression, and also targets viral 3C proteases for degradation via the immunoproteasome; the complex requires distinct domains for interaction with STAT1 and for ubiquitin ligase activity.","method":"Transgenic mouse model, lentiviral transduction of human cells, co-immunoprecipitation, domain-mapping experiments, antiviral assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (transgenic mice, human cells, Co-IP, domain mapping, functional antiviral readout), published in high-tier journal","pmids":["26479788"],"is_preprint":false},{"year":2016,"finding":"PARP9 and PARP14 have opposing roles in macrophage activation: PARP9 silencing suppresses pro-inflammatory gene expression and STAT1 phosphorylation in IFNγ-stimulated macrophages; PARP14 induces ADP-ribosylation of STAT1, which is suppressed by PARP9; mutations at ADP-ribosylation sites on STAT1 lead to increased STAT1 phosphorylation.","method":"siRNA silencing in primary macrophages, global proteomic analysis, ADP-ribosylation assay, phosphorylation Western blot, site-directed mutagenesis of STAT1","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis combined with biochemical ADP-ribosylation assay and functional phosphorylation readout, replicated across multiple cell types","pmids":["27796300"],"is_preprint":false},{"year":2017,"finding":"The DTX3L/PARP9 heterodimer mediates NAD+-dependent mono-ADP-ribosylation of the carboxyl group of ubiquitin Gly76 exclusively in the context of ubiquitin processing by E1 and E2 enzymes; ADP-ribosylation of Ub Gly76 precludes ubiquitylation of substrates. Poly(ADP-ribose) binding to PARP9 macrodomains increases DTX3L E3 ligase activity, while PARP9 ADP-ribosylation activity restrains it. Mutation of the NAD+-binding site in PARP9 increases the DNA repair activity of the heterodimer.","method":"In vitro biochemical reconstitution, NAD+-dependent ADP-ribosylation assay with E1/E2/E3 ubiquitylation cascade, site-directed mutagenesis of NAD+-binding site, PAR-binding assay, DNA repair functional assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis and multiple orthogonal assays establishing catalytic mechanism","pmids":["28525742"],"is_preprint":false},{"year":2018,"finding":"PARP9 knockdown inhibits breast cancer cell migration, establishing a direct role for PARP9 in promoting cancer cell migration.","method":"siRNA knockdown with migration assay in breast cancer cell lines","journal":"Oncology letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single KD/migration assay, single lab, no pathway placement","pmids":["30128030"],"is_preprint":false},{"year":2019,"finding":"ARTD9/PARP9 is itself ADP-ribosylated in IFN-γ-stimulated THP-1 macrophage-like cells, as identified by mass spectrometry; IFN-γ increases the ADP-ribosylation status of ARTD9/PARP9.","method":"Af1521 ADP-ribosyl binding protein enrichment and anti-PAR antibody immunoprecipitation coupled with LC-MS/MS; EThcD and HCD activation","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mass spectrometric identification of modification sites with two orthogonal enrichment strategies, single lab","pmids":["30848916"],"is_preprint":false},{"year":2021,"finding":"PARP9 serves as a non-canonical RNA sensor in dendritic cells and macrophages; it directly recognizes and binds viral RNA, recruits and activates the PI3K/AKT3 pathway independent of MAVS, which in turn phosphorylates IRF3 at Ser385 and IRF7 at Ser437/438 to drive type I IFN production. PARP9-deficient mice showed enhanced susceptibility to RNA virus infection due to impaired type I IFN production.","method":"Knockdown/knockout in human and mouse dendritic cells and macrophages, RNA pull-down/binding assay, PI3K/AKT pathway inhibitor experiments, phospho-specific antibody Western blots, PARP9-deficient mouse infection model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RNA binding, KO mice, signaling pathway dissection, phospho-site mapping), replicated in human and mouse systems","pmids":["33976210"],"is_preprint":false},{"year":2021,"finding":"IFN-response-induced ADP-ribosylation of host proteins is dependent on PARP9 and its binding partner DTX3L; the SARS-CoV-2 Nsp3 macrodomain reverses this PARP9/DTX3L-dependent ADP-ribosylation. However, expression of Nsp3 macrodomain or deletion of PARP9 or DTX3L does not impair IFN signaling or induction of IFN-responsive genes, indicating that PARP9/DTX3L-dependent ADP-ribosylation acts downstream of the IFN response rather than regulating the response itself.","method":"Immunofluorescence-based ADP-ribosylation assay, PARP9/DTX3L knockout cell lines, ectopic expression of SARS-CoV-2 Nsp3 macrodomain, IFN-stimulated gene expression analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO cells with direct biochemical readout of ADP-ribosylation, multiple genetic perturbations, negative result for IFN signaling impact rigorously established","pmids":["34358560"],"is_preprint":false},{"year":2022,"finding":"The DTX3L D3 domain (residues 230–510) mediates interaction with PARP9 with nanomolar affinity and 1:1 stoichiometry; the DTX3L N-terminal region (residues 1–200) drives higher-order oligomerization of the DTX3L-PARP9 complex. ADP-ribosylation of ubiquitin at Gly76 by DTX3L-PARP9 is reversible in vitro by macrodomain-type hydrolases.","method":"Recombinant protein production, binding affinity measurements (SPR/ITC), size-exclusion chromatography, in vitro ADP-ribosylation reversal assay with macrodomain hydrolases","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution with recombinant proteins, quantitative binding measurements, domain mapping, enzymatic reversal assay","pmids":["35037691"],"is_preprint":false},{"year":2024,"finding":"PARP9/DTX3L complex regulates PARP14 protein levels via post-translational mechanisms and is required to uphold PARP14 activity; the macrodomain 1 of PARP9 has hydrolytic activity that regulates PARP14-mediated ADP-ribosylation. PARP9/DTX3L and PARP14 co-localize to IFNγ-induced cytoplasmic inclusions containing ADP-ribosylated proteins. PARP14 itself and DTX3L are likely targets of PARP14 ADP-ribosylation.","method":"KO/knockdown cell lines, immunofluorescence co-localization, Western blot for protein levels, in vitro ADP-ribosylation assays, SARS-CoV-2 Nsp3 macrodomain hydrolysis assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic perturbations, biochemical assays, co-localization, replicated by companion paper in same issue","pmids":["38834852"],"is_preprint":false},{"year":2024,"finding":"PARP14 is the major enzyme responsible for IFNγ-induced ADP-ribosylation; PARP9 and its partner DTX3L regulate PARP14 activity through protein-protein interactions and through the hydrolytic activity of PARP9 macrodomain 1. The SARS-CoV-2 Mac1 macrodomain reverses this IFN-induced ADP-ribosylation. KH-like domains in PARP9 contribute to protein-protein interactions between PARP9 and DTX3L, and between PARP14 and DTX3L; DTX3L interaction with PARP14 in vitro suppresses PARP14 auto-ADP-ribosylation and promotes trans-ADP-ribosylation of PARP9 and DTX3L.","method":"Improved antibody-based detection of mono-ADP-ribosylation, KO cell lines, in vitro ADP-ribosylation assays, domain mapping, co-immunoprecipitation, site-directed mutagenesis of KH-like domain","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis, KO cells, multiple orthogonal methods, companion papers replicate key findings","pmids":["38834853","38182103"],"is_preprint":false}],"current_model":"PARP9 (BAL1/ARTD9) is a macrodomain-containing mono-ADP-ribosyltransferase that constitutively heterodimerizes with the E3 ubiquitin ligase DTX3L via nanomolar-affinity interactions; together they mediate NAD+-dependent ADP-ribosylation of ubiquitin Gly76 (blocking ubiquitin conjugation), are recruited to DNA damage sites via PAR-dependent macrodomain binding to promote BRCA1/53BP1-dependent DSB repair, regulate IFNγ-induced ADP-ribosylation by controlling PARP14 protein levels and activity through protein-protein interactions and PARP9 macrodomain 1 hydrolase activity, suppress STAT1 phosphorylation and macrophage pro-inflammatory activation in opposition to PARP14, act as a non-canonical viral RNA sensor that engages the PI3K–AKT3–IRF3/7 axis to drive type I interferon production, and repress the IFNγ–STAT1–IRF1–p53 tumor-suppressor axis in B-cell lymphoma through ADP-ribosylation-dependent physical interaction with STAT1."},"narrative":{"mechanistic_narrative":"PARP9 (BAL1/ARTD9) is a macrodomain-containing mono-ADP-ribosyltransferase that operates as a constitutive heterodimer with the E3 ubiquitin ligase DTX3L to integrate ADP-ribosylation and ubiquitin signaling in DNA repair, interferon responses, and tumor cell behavior [PMID:23230272, PMID:26479788, PMID:28525742]. The PARP9–DTX3L interaction is direct and of nanomolar affinity, mediated by the DTX3L D3 domain and by KH-like domains in PARP9, with the DTX3L N-terminus driving higher-order oligomerization [PMID:35037691, PMID:38834853, PMID:38182103]. Biochemically, the heterodimer catalyzes NAD+-dependent mono-ADP-ribosylation of ubiquitin Gly76 within the E1/E2/E3 cascade, a modification that blocks ubiquitin conjugation and is reversible by macrodomain hydrolases; poly(ADP-ribose) binding by the PARP9 macrodomains stimulates DTX3L ligase activity while PARP9 catalytic activity restrains it [PMID:28525742, PMID:35037691]. Through PAR-dependent macrodomain recruitment to DNA lesions, the complex promotes local ubiquitylation and 53BP1/BRCA1-dependent double-strand break repair independently of ATM, MDC1, and RNF8 [PMID:23230272]. In the interferon system, PARP9–DTX3L ubiquitylates histone H2BJ to promote ISG expression and degrades viral 3C proteases, and PARP9 itself acts as a non-canonical viral RNA sensor that engages a PI3K–AKT3 axis to phosphorylate IRF3 and IRF7 and drive type I IFN production [PMID:26479788, PMID:33976210]. PARP9 and DTX3L govern IFNγ-induced ADP-ribosylation by controlling PARP14 protein levels and activity through protein–protein interactions and the hydrolytic activity of PARP9 macrodomain 1, with PARP9 opposing PARP14 to suppress STAT1 phosphorylation and pro-inflammatory macrophage activation [PMID:27796300, PMID:38834852, PMID:38834853, PMID:38182103]. PARP9 binds STAT1 through its macrodomains in an ADP-ribosylation-dependent manner and represses the IRF1 tumor-suppressor program while promoting B-cell lymphoma and cancer cell migration [PMID:23487038, PMID:24886089].","teleology":[{"year":2003,"claim":"Establishing that PARP9 physically partners the E3 ligase DTX3L defined the heterodimer that underlies all subsequent mechanistic work and linked PARP9 to the ubiquitin system.","evidence":"Yeast two-hybrid, in vitro self-ubiquitination, and co-immunoprecipitation","pmids":["12670957"],"confidence":"Medium","gaps":["Did not define interaction interface or affinity","Did not establish a catalytic relationship between the two enzymatic activities"]},{"year":2006,"claim":"Identifying a shared IFNγ-responsive bidirectional promoter and DTX3L-controlled shuttling of PARP9 placed the pair in interferon signaling and explained their coordinate regulation.","evidence":"Reporter promoter assay, doxycycline-inducible overexpression with expression profiling, live-cell imaging","pmids":["16809771"],"confidence":"Medium","gaps":["Mechanism by which PARP9 alters ISG expression not defined","Direct molecular targets not identified"]},{"year":2012,"claim":"Showing PAR-dependent macrodomain recruitment of PARP9–DTX3L to DNA breaks established a direct role in DSB repair distinct from canonical ATM/RNF8 signaling.","evidence":"Laser micro-irradiation imaging, PARP1 inhibition, siRNA knockdown with γH2AX, chromatin fractionation","pmids":["23230272"],"confidence":"High","gaps":["The relevant ubiquitylation substrate at breaks not identified here","Contribution of PARP9 catalysis versus DTX3L ligase activity unresolved"]},{"year":2013,"claim":"Demonstrating ADP-ribosylation-dependent macrodomain binding to STAT1 connected PARP9 to transcriptional control of the IRF1 tumor-suppressor axis in lymphoma.","evidence":"Reciprocal co-IP, phospho-Western blot, immunofluorescence, knockdown/overexpression expression analysis","pmids":["23487038"],"confidence":"Medium","gaps":["Single-lab cell-line study","Direct ADP-ribosylation of STAT1 by PARP9 versus a partner not separated"]},{"year":2014,"claim":"Extending the complex to include PARP14 and linking it to IRF1 repression and migration generalized PARP9–DTX3L function to solid tumor metastasis.","evidence":"Co-immunoprecipitation, siRNA knockdown with proliferation/migration assays, RT-PCR, immunofluorescence","pmids":["24886089"],"confidence":"Medium","gaps":["Stoichiometry and architecture of the PARP9/DTX3L/PARP14 assembly undefined","Causal mechanism linking the complex to migration not resolved"]},{"year":2015,"claim":"Identifying H2BJ and viral 3C proteases as DTX3L–PARP9 ubiquitylation targets defined how the complex promotes ISG expression and antiviral defense, and mapped distinct domains for STAT1 binding versus ligase activity.","evidence":"Transgenic mice, lentiviral transduction, co-IP, domain mapping, antiviral assays","pmids":["26479788"],"confidence":"High","gaps":["How histone ubiquitylation translates to specific ISG induction not detailed","Relative weighting of PARP9 versus DTX3L in substrate selection unclear"]},{"year":2016,"claim":"Establishing that PARP9 opposes PARP14 to suppress STAT1 ADP-ribosylation and phosphorylation defined a switch governing macrophage pro-inflammatory polarization.","evidence":"siRNA silencing in primary macrophages, proteomics, ADP-ribosylation assay, phospho-Western, STAT1 site mutagenesis","pmids":["27796300"],"confidence":"High","gaps":["Whether PARP9 directly de-ADP-ribosylates STAT1 or acts via PARP14 not separated here","In vivo macrophage relevance not tested"]},{"year":2017,"claim":"In vitro reconstitution revealed that DTX3L–PARP9 mono-ADP-ribosylates ubiquitin Gly76 to block conjugation, defining a self-regulating switch in which PAR binding and PARP9 catalysis tune ligase output.","evidence":"Biochemical reconstitution of the E1/E2/E3 cascade, NAD+-dependent ADP-ribosylation assay, NAD+-site mutagenesis, PAR-binding and DNA-repair assays","pmids":["28525742"],"confidence":"High","gaps":["Physiological substrates ADP-ribosylated on ubiquitin in cells not enumerated","How macrodomain PAR sensing is timed in vivo unresolved"]},{"year":2019,"claim":"Mapping IFNγ-induced ADP-ribosylation of PARP9 itself indicated the protein is a target as well as an effector of ADP-ribosylation signaling.","evidence":"Af1521 enrichment and anti-PAR IP coupled with LC-MS/MS","pmids":["30848916"],"confidence":"Medium","gaps":["Enzyme responsible for PARP9 modification not assigned here","Functional consequence of PARP9 ADP-ribosylation untested"]},{"year":2021,"claim":"Identifying PARP9 as a MAVS-independent viral RNA sensor that activates PI3K–AKT3–IRF3/7 established a direct, non-canonical route to type I IFN production.","evidence":"Knockdown/knockout in human and mouse DCs and macrophages, RNA pull-down, pathway inhibitors, phospho-site Westerns, PARP9-deficient mouse infection","pmids":["33976210"],"confidence":"High","gaps":["Structural basis of viral RNA recognition not defined","Role of DTX3L or PARP9 catalysis in sensing untested"]},{"year":2021,"claim":"Demonstrating that PARP9/DTX3L-dependent ADP-ribosylation acts downstream of the IFN response, and is reversed by the SARS-CoV-2 Nsp3 macrodomain, refined where in the pathway the complex operates.","evidence":"Immunofluorescence ADP-ribosylation assay, PARP9/DTX3L KO cells, ectopic Nsp3 macrodomain, ISG expression analysis","pmids":["34358560"],"confidence":"High","gaps":["Downstream targets of the IFN-induced ADP-ribosylation not identified","Biological output of viral reversal not determined"]},{"year":2022,"claim":"Quantitative interaction mapping defined the DTX3L D3 domain as the nanomolar 1:1 PARP9 anchor and the N-terminus as the oligomerization driver, and showed ubiquitin-Gly76 ADP-ribosylation is reversible by hydrolases.","evidence":"Recombinant proteins, SPR/ITC affinity measurement, size-exclusion chromatography, in vitro reversal with macrodomain hydrolases","pmids":["35037691"],"confidence":"High","gaps":["Functional role of higher-order oligomerization in cells untested","Endogenous hydrolase that reverses the mark not identified"]},{"year":2024,"claim":"Showing that PARP9 macrodomain 1 hydrolase activity and the PARP9/DTX3L complex control PARP14 levels and activity, with co-localization to IFNγ-induced cytoplasmic inclusions, established PARP9 as a master regulator of IFNγ-induced ADP-ribosylation.","evidence":"KO/knockdown cells, immunofluorescence co-localization, Western blot, in vitro ADP-ribosylation, SARS-CoV-2 Nsp3 hydrolysis assay, domain mapping with KH-like domain mutagenesis, companion papers","pmids":["38834852","38834853","38182103"],"confidence":"High","gaps":["Precise substrates within cytoplasmic inclusions not fully cataloged","Physiological signaling output of PARP14 regulation by PARP9 not defined"]},{"year":null,"claim":"How the multiple PARP9–DTX3L activities — ubiquitin-Gly76 ADP-ribosylation, macrodomain hydrolysis of PARP14 marks, DNA-repair ubiquitylation, STAT1/IRF1 transcriptional control, and viral RNA sensing — are coordinated and selectively engaged in a given cell remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No unified structural model of the full PARP9/DTX3L(/PARP14) assembly in action","Substrate-selection logic across DNA-repair versus IFN contexts undefined","In vivo phenotypes of catalytically dead PARP9 not delineated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[9,16]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[9,15]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[15,16]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[12]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[5,6]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[15]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,8,12]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[4]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[7,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[12,5]}],"complexes":["PARP9-DTX3L heterodimer","PARP9-DTX3L-PARP14 complex"],"partners":["DTX3L","PARP14","STAT1","PARP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IXQ6","full_name":"Protein mono-ADP-ribosyltransferase PARP9","aliases":["ADP-ribosyltransferase diphtheria toxin-like 9","ARTD9","B aggressive lymphoma protein","Poly [ADP-ribose] polymerase 9","PARP-9"],"length_aa":854,"mass_kda":96.3,"function":"ADP-ribosyltransferase which, in association with E3 ligase DTX3L, plays a role in DNA damage repair and in immune responses including interferon-mediated antiviral defenses (PubMed:16809771, PubMed:23230272, PubMed:26479788, PubMed:27796300). Within the complex, enhances DTX3L E3 ligase activity which is further enhanced by PARP9 binding to poly(ADP-ribose) (PubMed:28525742). In association with DTX3L and in presence of E1 and E2 enzymes, mediates NAD(+)-dependent mono-ADP-ribosylation of ubiquitin which prevents ubiquitin conjugation to substrates such as histones (PubMed:28525742). During DNA repair, PARP1 recruits PARP9/BAL1-DTX3L complex to DNA damage sites via PARP9 binding to ribosylated PARP1 (PubMed:23230272). Subsequent PARP1-dependent PARP9/BAL1-DTX3L-mediated ubiquitination promotes the rapid and specific recruitment of 53BP1/TP53BP1, UIMC1/RAP80, and BRCA1 to DNA damage sites (PubMed:23230272, PubMed:28525742). In response to DNA damage, PARP9-DTX3L complex is required for efficient non-homologous end joining (NHEJ); the complex function is negatively modulated by PARP9 activity (PubMed:28525742). Dispensable for B-cell receptor (BCR) assembly through V(D)J recombination and class switch recombination (CSR) (By similarity). In macrophages, positively regulates pro-inflammatory cytokines production in response to IFNG stimulation by suppressing PARP14-mediated STAT1 ADP-ribosylation and thus promoting STAT1 phosphorylation (PubMed:27796300). Also suppresses PARP14-mediated STAT6 ADP-ribosylation (PubMed:27796300)","subcellular_location":"Cytoplasm, cytosol; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q8IXQ6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PARP9","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PARP9","total_profiled":1310},"omim":[{"mim_id":"613143","title":"DELTEX E3 UBIQUITIN LIGASE 3L; DTX3L","url":"https://www.omim.org/entry/613143"},{"mim_id":"612066","title":"POLY(ADP-RIBOSE) POLYMERASE FAMILY, MEMBER 15; PARP15","url":"https://www.omim.org/entry/612066"},{"mim_id":"612065","title":"POLY(ADP-RIBOSE) POLYMERASE FAMILY, MEMBER 9; PARP9","url":"https://www.omim.org/entry/612065"},{"mim_id":"610028","title":"POLY(ADP-RIBOSE) POLYMERASE FAMILY, MEMBER 14; PARP14","url":"https://www.omim.org/entry/610028"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Mitochondria","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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cytology of the nasal middle meatus and BAL in chronic rhinosinusitis.","date":"2005","source":"Rhinology","url":"https://pubmed.ncbi.nlm.nih.gov/15844496","citation_count":19,"is_preprint":false},{"pmid":"35286818","id":"PMC_35286818","title":"Chronic Obstructive Pulmonary Disease Is Associated with Epigenome-Wide Differential Methylation in BAL Lung Cells.","date":"2022","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/35286818","citation_count":18,"is_preprint":false},{"pmid":"30972061","id":"PMC_30972061","title":"Differential Effects of Human SP-A1 and SP-A2 on the BAL Proteome and Signaling Pathways in Response to Klebsiella pneumoniae and Ozone Exposure.","date":"2019","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30972061","citation_count":18,"is_preprint":false},{"pmid":"9925077","id":"PMC_9925077","title":"Intrapulmonary cytokine accumulation following BAL and the role of endotoxin contamination.","date":"1999","source":"Chest","url":"https://pubmed.ncbi.nlm.nih.gov/9925077","citation_count":18,"is_preprint":false},{"pmid":"8915227","id":"PMC_8915227","title":"BAL neutrophilia in asthmatic patients. A by-product of eosinophil recruitment?","date":"1996","source":"Chest","url":"https://pubmed.ncbi.nlm.nih.gov/8915227","citation_count":18,"is_preprint":false},{"pmid":"23686776","id":"PMC_23686776","title":"Incidence of pulmonary aspergillosis and correlation of conventional diagnostic methods with nested PCR and real-time PCR assay using BAL fluid in intensive care unit patients.","date":"2013","source":"Journal of clinical laboratory analysis","url":"https://pubmed.ncbi.nlm.nih.gov/23686776","citation_count":18,"is_preprint":false},{"pmid":"32962817","id":"PMC_32962817","title":"Adiponectin and leptin levels in idiopathic pulmonary fibrosis: A new method for BAL and serum assessment.","date":"2020","source":"Immunobiology","url":"https://pubmed.ncbi.nlm.nih.gov/32962817","citation_count":17,"is_preprint":false},{"pmid":"8726930","id":"PMC_8726930","title":"Integrin alpha E beta 7 expression on BAL CD4+, CD8+, and gamma delta T-cells in bleomycin-induced lung fibrosis in mouse.","date":"1996","source":"The European respiratory journal","url":"https://pubmed.ncbi.nlm.nih.gov/8726930","citation_count":17,"is_preprint":false},{"pmid":"28213470","id":"PMC_28213470","title":"Higher mini-BAL total protein concentration in early ARDS predicts faster resolution of lung injury measured by more ventilator-free days.","date":"2017","source":"American journal of physiology. Lung cellular and molecular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/28213470","citation_count":17,"is_preprint":false},{"pmid":"1120105","id":"PMC_1120105","title":"DNA-dependent RNA polymerase from Pseudomonas BAL-31. II. Transcription of the allomorphic forms of bacteriophage PM2 DNA.","date":"1975","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/1120105","citation_count":16,"is_preprint":false},{"pmid":"26168736","id":"PMC_26168736","title":"BAL neutrophilia in azithromycin-treated lung transplant recipients: Clinical significance.","date":"2015","source":"Transplant immunology","url":"https://pubmed.ncbi.nlm.nih.gov/26168736","citation_count":16,"is_preprint":false},{"pmid":"20625676","id":"PMC_20625676","title":"Cell profile of BAL fluid in children and adolescents with and without lung disease.","date":"2010","source":"Jornal brasileiro de pneumologia : publicacao oficial da Sociedade Brasileira de Pneumologia e Tisilogia","url":"https://pubmed.ncbi.nlm.nih.gov/20625676","citation_count":15,"is_preprint":false},{"pmid":"19273541","id":"PMC_19273541","title":"Serum and BAL cytokine and antioxidant enzyme levels at different stages of pneumoconiosis in coal workers.","date":"2008","source":"Human & experimental toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/19273541","citation_count":15,"is_preprint":false},{"pmid":"18947171","id":"PMC_18947171","title":"Modification of a common BAL technique to enhance sample diagnostic value.","date":"2008","source":"Journal of the American Association for Laboratory Animal Science : JAALAS","url":"https://pubmed.ncbi.nlm.nih.gov/18947171","citation_count":15,"is_preprint":false},{"pmid":"28479508","id":"PMC_28479508","title":"Integron types, gene cassettes and antimicrobial resistance profile of Acinetobacter baumannii isolated from BAL samples in Babol, north of Iran.","date":"2017","source":"Microbial pathogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/28479508","citation_count":15,"is_preprint":false},{"pmid":"32207982","id":"PMC_32207982","title":"Single-Cell Flow Cytometry Profiling of BAL in Children.","date":"2020","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/32207982","citation_count":14,"is_preprint":false},{"pmid":"10460872","id":"PMC_10460872","title":"Eosinophilic alveolitis in BAL after lung transplantation.","date":"1999","source":"Transplant international : official journal of the European Society for Organ Transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/10460872","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":55007,"output_tokens":4775,"usd":0.118323,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12817,"output_tokens":4867,"usd":0.09288,"stage2_stop_reason":"end_turn"},"total_usd":0.211203,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"BAL (PARP9) is a novel nuclear protein that promotes B-cell migration; stable BAL-overexpressing B-cell lymphoma transfectants showed significantly higher rates of migration in transwell assays compared to vector-only transfectants.\",\n      \"method\": \"Stable transfection overexpression with transwell migration assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single functional assay in cell line, single lab, but direct loss/gain-of-function with specific phenotypic readout\",\n      \"pmids\": [\"11110709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"BAL (PARP9) binds BBAP (DTX3L) via yeast two-hybrid interaction; DTX3L/BBAP functions as an E3 ubiquitin ligase capable of self-ubiquitination, and heterodimerizes with BAL/PARP9 to modify E3 activity and/or substrate availability.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro self-ubiquitination assay, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interactions shown, E3 activity demonstrated biochemically, single lab\",\n      \"pmids\": [\"12670957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"BAL1/PARP9 and BBAP/DTX3L are regulated by a shared IFN-γ-responsive bidirectional promoter on chromosome 3q21; IFN-γ induces BAL1 expression, and doxycycline-induced BAL1 increases expression of multiple IFN-stimulated genes, directly implicating BAL1 in an IFN signaling pathway. BBAP regulates the subcellular localization of BAL1 by a dynamic shuttling mechanism.\",\n      \"method\": \"Reporter assay for bidirectional promoter, doxycycline-inducible overexpression with gene expression profiling, live-cell imaging of subcellular localization\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (promoter assay, inducible OE, localization), single lab\",\n      \"pmids\": [\"16809771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Parp-9 (PARP9) is developmentally regulated and prominently expressed in thymus, specific brain regions, gut, and intestine in mice; Bbap/DTX3L is essentially coexpressed with Parp-9 during development and in adult mouse tissues, consistent with co-regulation from their shared promoter.\",\n      \"method\": \"In situ hybridization and tissue expression analysis during mouse development and adulthood\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — descriptive expression pattern, single lab, no functional perturbation\",\n      \"pmids\": [\"18069692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"BAL1/PARP9 is recruited to DNA damage sites in a PARP1/poly(ADP-ribose)-dependent manner via its macrodomains, and together with its partner BBAP/DTX3L promotes local ubiquitylation, 53BP1 and BRCA1 recruitment, and double-strand break repair independent of ATM, MDC1, and RNF8.\",\n      \"method\": \"Live-cell imaging of GFP-tagged proteins at laser-induced DNA damage, PARP1 inhibitor treatment, siRNA knockdown with γH2AX quantification, chromatin fractionation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (live imaging, inhibitor, KD, fractionation), direct functional consequence on DNA repair demonstrated\",\n      \"pmids\": [\"23230272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BAL1/ARTD9/PARP9 physically interacts with STAT1α and STAT1β through its macrodomains in an ADP-ribosylation-dependent manner; it stimulates phosphorylation of both STAT1 isoforms on Y701, promotes nuclear accumulation of transcriptionally repressive STAT1β, and directly inhibits IRF1 expression together with STAT1β, while enhancing expression of proto-oncogenes IRF2 and BCL6 in DLBCL.\",\n      \"method\": \"Co-immunoprecipitation, Western blot for phosphorylation, immunofluorescence for nuclear localization, knockdown/overexpression with gene expression analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, multiple readouts, single lab\",\n      \"pmids\": [\"23487038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DTX3L (BBAP) and ARTD9/PARP9 form a complex together and also with ARTD8/PARP14 in metastatic prostate cancer cells; DTX3L and ARTD9/PARP9 act together as repressors of the tumor suppressor IRF1, and together with STAT1 and STAT3, DTX3L is implicated in cell migration. Co-immunoprecipitation confirmed physical interactions between DTX3L, ARTD8, and ARTD9.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown with proliferation/survival/migration assays, real-time RT-PCR, Western blot, immunofluorescence\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus multiple functional readouts, single lab\",\n      \"pmids\": [\"24886089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PARP9 forms a complex with DTX3L that acts as an E3 ubiquitin ligase targeting host histone H2BJ to promote interferon-stimulated gene expression, and also targets viral 3C proteases for degradation via the immunoproteasome; the complex requires distinct domains for interaction with STAT1 and for ubiquitin ligase activity.\",\n      \"method\": \"Transgenic mouse model, lentiviral transduction of human cells, co-immunoprecipitation, domain-mapping experiments, antiviral assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (transgenic mice, human cells, Co-IP, domain mapping, functional antiviral readout), published in high-tier journal\",\n      \"pmids\": [\"26479788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PARP9 and PARP14 have opposing roles in macrophage activation: PARP9 silencing suppresses pro-inflammatory gene expression and STAT1 phosphorylation in IFNγ-stimulated macrophages; PARP14 induces ADP-ribosylation of STAT1, which is suppressed by PARP9; mutations at ADP-ribosylation sites on STAT1 lead to increased STAT1 phosphorylation.\",\n      \"method\": \"siRNA silencing in primary macrophages, global proteomic analysis, ADP-ribosylation assay, phosphorylation Western blot, site-directed mutagenesis of STAT1\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis combined with biochemical ADP-ribosylation assay and functional phosphorylation readout, replicated across multiple cell types\",\n      \"pmids\": [\"27796300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The DTX3L/PARP9 heterodimer mediates NAD+-dependent mono-ADP-ribosylation of the carboxyl group of ubiquitin Gly76 exclusively in the context of ubiquitin processing by E1 and E2 enzymes; ADP-ribosylation of Ub Gly76 precludes ubiquitylation of substrates. Poly(ADP-ribose) binding to PARP9 macrodomains increases DTX3L E3 ligase activity, while PARP9 ADP-ribosylation activity restrains it. Mutation of the NAD+-binding site in PARP9 increases the DNA repair activity of the heterodimer.\",\n      \"method\": \"In vitro biochemical reconstitution, NAD+-dependent ADP-ribosylation assay with E1/E2/E3 ubiquitylation cascade, site-directed mutagenesis of NAD+-binding site, PAR-binding assay, DNA repair functional assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis and multiple orthogonal assays establishing catalytic mechanism\",\n      \"pmids\": [\"28525742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PARP9 knockdown inhibits breast cancer cell migration, establishing a direct role for PARP9 in promoting cancer cell migration.\",\n      \"method\": \"siRNA knockdown with migration assay in breast cancer cell lines\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single KD/migration assay, single lab, no pathway placement\",\n      \"pmids\": [\"30128030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ARTD9/PARP9 is itself ADP-ribosylated in IFN-γ-stimulated THP-1 macrophage-like cells, as identified by mass spectrometry; IFN-γ increases the ADP-ribosylation status of ARTD9/PARP9.\",\n      \"method\": \"Af1521 ADP-ribosyl binding protein enrichment and anti-PAR antibody immunoprecipitation coupled with LC-MS/MS; EThcD and HCD activation\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mass spectrometric identification of modification sites with two orthogonal enrichment strategies, single lab\",\n      \"pmids\": [\"30848916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PARP9 serves as a non-canonical RNA sensor in dendritic cells and macrophages; it directly recognizes and binds viral RNA, recruits and activates the PI3K/AKT3 pathway independent of MAVS, which in turn phosphorylates IRF3 at Ser385 and IRF7 at Ser437/438 to drive type I IFN production. PARP9-deficient mice showed enhanced susceptibility to RNA virus infection due to impaired type I IFN production.\",\n      \"method\": \"Knockdown/knockout in human and mouse dendritic cells and macrophages, RNA pull-down/binding assay, PI3K/AKT pathway inhibitor experiments, phospho-specific antibody Western blots, PARP9-deficient mouse infection model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RNA binding, KO mice, signaling pathway dissection, phospho-site mapping), replicated in human and mouse systems\",\n      \"pmids\": [\"33976210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IFN-response-induced ADP-ribosylation of host proteins is dependent on PARP9 and its binding partner DTX3L; the SARS-CoV-2 Nsp3 macrodomain reverses this PARP9/DTX3L-dependent ADP-ribosylation. However, expression of Nsp3 macrodomain or deletion of PARP9 or DTX3L does not impair IFN signaling or induction of IFN-responsive genes, indicating that PARP9/DTX3L-dependent ADP-ribosylation acts downstream of the IFN response rather than regulating the response itself.\",\n      \"method\": \"Immunofluorescence-based ADP-ribosylation assay, PARP9/DTX3L knockout cell lines, ectopic expression of SARS-CoV-2 Nsp3 macrodomain, IFN-stimulated gene expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO cells with direct biochemical readout of ADP-ribosylation, multiple genetic perturbations, negative result for IFN signaling impact rigorously established\",\n      \"pmids\": [\"34358560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The DTX3L D3 domain (residues 230–510) mediates interaction with PARP9 with nanomolar affinity and 1:1 stoichiometry; the DTX3L N-terminal region (residues 1–200) drives higher-order oligomerization of the DTX3L-PARP9 complex. ADP-ribosylation of ubiquitin at Gly76 by DTX3L-PARP9 is reversible in vitro by macrodomain-type hydrolases.\",\n      \"method\": \"Recombinant protein production, binding affinity measurements (SPR/ITC), size-exclusion chromatography, in vitro ADP-ribosylation reversal assay with macrodomain hydrolases\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution with recombinant proteins, quantitative binding measurements, domain mapping, enzymatic reversal assay\",\n      \"pmids\": [\"35037691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PARP9/DTX3L complex regulates PARP14 protein levels via post-translational mechanisms and is required to uphold PARP14 activity; the macrodomain 1 of PARP9 has hydrolytic activity that regulates PARP14-mediated ADP-ribosylation. PARP9/DTX3L and PARP14 co-localize to IFNγ-induced cytoplasmic inclusions containing ADP-ribosylated proteins. PARP14 itself and DTX3L are likely targets of PARP14 ADP-ribosylation.\",\n      \"method\": \"KO/knockdown cell lines, immunofluorescence co-localization, Western blot for protein levels, in vitro ADP-ribosylation assays, SARS-CoV-2 Nsp3 macrodomain hydrolysis assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic perturbations, biochemical assays, co-localization, replicated by companion paper in same issue\",\n      \"pmids\": [\"38834852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PARP14 is the major enzyme responsible for IFNγ-induced ADP-ribosylation; PARP9 and its partner DTX3L regulate PARP14 activity through protein-protein interactions and through the hydrolytic activity of PARP9 macrodomain 1. The SARS-CoV-2 Mac1 macrodomain reverses this IFN-induced ADP-ribosylation. KH-like domains in PARP9 contribute to protein-protein interactions between PARP9 and DTX3L, and between PARP14 and DTX3L; DTX3L interaction with PARP14 in vitro suppresses PARP14 auto-ADP-ribosylation and promotes trans-ADP-ribosylation of PARP9 and DTX3L.\",\n      \"method\": \"Improved antibody-based detection of mono-ADP-ribosylation, KO cell lines, in vitro ADP-ribosylation assays, domain mapping, co-immunoprecipitation, site-directed mutagenesis of KH-like domain\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis, KO cells, multiple orthogonal methods, companion papers replicate key findings\",\n      \"pmids\": [\"38834853\", \"38182103\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PARP9 (BAL1/ARTD9) is a macrodomain-containing mono-ADP-ribosyltransferase that constitutively heterodimerizes with the E3 ubiquitin ligase DTX3L via nanomolar-affinity interactions; together they mediate NAD+-dependent ADP-ribosylation of ubiquitin Gly76 (blocking ubiquitin conjugation), are recruited to DNA damage sites via PAR-dependent macrodomain binding to promote BRCA1/53BP1-dependent DSB repair, regulate IFNγ-induced ADP-ribosylation by controlling PARP14 protein levels and activity through protein-protein interactions and PARP9 macrodomain 1 hydrolase activity, suppress STAT1 phosphorylation and macrophage pro-inflammatory activation in opposition to PARP14, act as a non-canonical viral RNA sensor that engages the PI3K–AKT3–IRF3/7 axis to drive type I interferon production, and repress the IFNγ–STAT1–IRF1–p53 tumor-suppressor axis in B-cell lymphoma through ADP-ribosylation-dependent physical interaction with STAT1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PARP9 (BAL1/ARTD9) is a macrodomain-containing mono-ADP-ribosyltransferase that operates as a constitutive heterodimer with the E3 ubiquitin ligase DTX3L to integrate ADP-ribosylation and ubiquitin signaling in DNA repair, interferon responses, and tumor cell behavior [#4, #7, #9]. The PARP9–DTX3L interaction is direct and of nanomolar affinity, mediated by the DTX3L D3 domain and by KH-like domains in PARP9, with the DTX3L N-terminus driving higher-order oligomerization [#14, #16]. Biochemically, the heterodimer catalyzes NAD+-dependent mono-ADP-ribosylation of ubiquitin Gly76 within the E1/E2/E3 cascade, a modification that blocks ubiquitin conjugation and is reversible by macrodomain hydrolases; poly(ADP-ribose) binding by the PARP9 macrodomains stimulates DTX3L ligase activity while PARP9 catalytic activity restrains it [#9, #14]. Through PAR-dependent macrodomain recruitment to DNA lesions, the complex promotes local ubiquitylation and 53BP1/BRCA1-dependent double-strand break repair independently of ATM, MDC1, and RNF8 [#4]. In the interferon system, PARP9–DTX3L ubiquitylates histone H2BJ to promote ISG expression and degrades viral 3C proteases, and PARP9 itself acts as a non-canonical viral RNA sensor that engages a PI3K–AKT3 axis to phosphorylate IRF3 and IRF7 and drive type I IFN production [#7, #12]. PARP9 and DTX3L govern IFNγ-induced ADP-ribosylation by controlling PARP14 protein levels and activity through protein–protein interactions and the hydrolytic activity of PARP9 macrodomain 1, with PARP9 opposing PARP14 to suppress STAT1 phosphorylation and pro-inflammatory macrophage activation [#8, #15, #16]. PARP9 binds STAT1 through its macrodomains in an ADP-ribosylation-dependent manner and represses the IRF1 tumor-suppressor program while promoting B-cell lymphoma and cancer cell migration [#5, #6].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing that PARP9 physically partners the E3 ligase DTX3L defined the heterodimer that underlies all subsequent mechanistic work and linked PARP9 to the ubiquitin system.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro self-ubiquitination, and co-immunoprecipitation\",\n      \"pmids\": [\"12670957\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define interaction interface or affinity\", \"Did not establish a catalytic relationship between the two enzymatic activities\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying a shared IFNγ-responsive bidirectional promoter and DTX3L-controlled shuttling of PARP9 placed the pair in interferon signaling and explained their coordinate regulation.\",\n      \"evidence\": \"Reporter promoter assay, doxycycline-inducible overexpression with expression profiling, live-cell imaging\",\n      \"pmids\": [\"16809771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which PARP9 alters ISG expression not defined\", \"Direct molecular targets not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showing PAR-dependent macrodomain recruitment of PARP9–DTX3L to DNA breaks established a direct role in DSB repair distinct from canonical ATM/RNF8 signaling.\",\n      \"evidence\": \"Laser micro-irradiation imaging, PARP1 inhibition, siRNA knockdown with γH2AX, chromatin fractionation\",\n      \"pmids\": [\"23230272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The relevant ubiquitylation substrate at breaks not identified here\", \"Contribution of PARP9 catalysis versus DTX3L ligase activity unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrating ADP-ribosylation-dependent macrodomain binding to STAT1 connected PARP9 to transcriptional control of the IRF1 tumor-suppressor axis in lymphoma.\",\n      \"evidence\": \"Reciprocal co-IP, phospho-Western blot, immunofluorescence, knockdown/overexpression expression analysis\",\n      \"pmids\": [\"23487038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab cell-line study\", \"Direct ADP-ribosylation of STAT1 by PARP9 versus a partner not separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extending the complex to include PARP14 and linking it to IRF1 repression and migration generalized PARP9–DTX3L function to solid tumor metastasis.\",\n      \"evidence\": \"Co-immunoprecipitation, siRNA knockdown with proliferation/migration assays, RT-PCR, immunofluorescence\",\n      \"pmids\": [\"24886089\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and architecture of the PARP9/DTX3L/PARP14 assembly undefined\", \"Causal mechanism linking the complex to migration not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying H2BJ and viral 3C proteases as DTX3L–PARP9 ubiquitylation targets defined how the complex promotes ISG expression and antiviral defense, and mapped distinct domains for STAT1 binding versus ligase activity.\",\n      \"evidence\": \"Transgenic mice, lentiviral transduction, co-IP, domain mapping, antiviral assays\",\n      \"pmids\": [\"26479788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How histone ubiquitylation translates to specific ISG induction not detailed\", \"Relative weighting of PARP9 versus DTX3L in substrate selection unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Establishing that PARP9 opposes PARP14 to suppress STAT1 ADP-ribosylation and phosphorylation defined a switch governing macrophage pro-inflammatory polarization.\",\n      \"evidence\": \"siRNA silencing in primary macrophages, proteomics, ADP-ribosylation assay, phospho-Western, STAT1 site mutagenesis\",\n      \"pmids\": [\"27796300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PARP9 directly de-ADP-ribosylates STAT1 or acts via PARP14 not separated here\", \"In vivo macrophage relevance not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"In vitro reconstitution revealed that DTX3L–PARP9 mono-ADP-ribosylates ubiquitin Gly76 to block conjugation, defining a self-regulating switch in which PAR binding and PARP9 catalysis tune ligase output.\",\n      \"evidence\": \"Biochemical reconstitution of the E1/E2/E3 cascade, NAD+-dependent ADP-ribosylation assay, NAD+-site mutagenesis, PAR-binding and DNA-repair assays\",\n      \"pmids\": [\"28525742\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological substrates ADP-ribosylated on ubiquitin in cells not enumerated\", \"How macrodomain PAR sensing is timed in vivo unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapping IFNγ-induced ADP-ribosylation of PARP9 itself indicated the protein is a target as well as an effector of ADP-ribosylation signaling.\",\n      \"evidence\": \"Af1521 enrichment and anti-PAR IP coupled with LC-MS/MS\",\n      \"pmids\": [\"30848916\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Enzyme responsible for PARP9 modification not assigned here\", \"Functional consequence of PARP9 ADP-ribosylation untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identifying PARP9 as a MAVS-independent viral RNA sensor that activates PI3K–AKT3–IRF3/7 established a direct, non-canonical route to type I IFN production.\",\n      \"evidence\": \"Knockdown/knockout in human and mouse DCs and macrophages, RNA pull-down, pathway inhibitors, phospho-site Westerns, PARP9-deficient mouse infection\",\n      \"pmids\": [\"33976210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of viral RNA recognition not defined\", \"Role of DTX3L or PARP9 catalysis in sensing untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that PARP9/DTX3L-dependent ADP-ribosylation acts downstream of the IFN response, and is reversed by the SARS-CoV-2 Nsp3 macrodomain, refined where in the pathway the complex operates.\",\n      \"evidence\": \"Immunofluorescence ADP-ribosylation assay, PARP9/DTX3L KO cells, ectopic Nsp3 macrodomain, ISG expression analysis\",\n      \"pmids\": [\"34358560\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream targets of the IFN-induced ADP-ribosylation not identified\", \"Biological output of viral reversal not determined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Quantitative interaction mapping defined the DTX3L D3 domain as the nanomolar 1:1 PARP9 anchor and the N-terminus as the oligomerization driver, and showed ubiquitin-Gly76 ADP-ribosylation is reversible by hydrolases.\",\n      \"evidence\": \"Recombinant proteins, SPR/ITC affinity measurement, size-exclusion chromatography, in vitro reversal with macrodomain hydrolases\",\n      \"pmids\": [\"35037691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of higher-order oligomerization in cells untested\", \"Endogenous hydrolase that reverses the mark not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showing that PARP9 macrodomain 1 hydrolase activity and the PARP9/DTX3L complex control PARP14 levels and activity, with co-localization to IFNγ-induced cytoplasmic inclusions, established PARP9 as a master regulator of IFNγ-induced ADP-ribosylation.\",\n      \"evidence\": \"KO/knockdown cells, immunofluorescence co-localization, Western blot, in vitro ADP-ribosylation, SARS-CoV-2 Nsp3 hydrolysis assay, domain mapping with KH-like domain mutagenesis, companion papers\",\n      \"pmids\": [\"38834852\", \"38834853\", \"38182103\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise substrates within cytoplasmic inclusions not fully cataloged\", \"Physiological signaling output of PARP14 regulation by PARP9 not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple PARP9–DTX3L activities — ubiquitin-Gly76 ADP-ribosylation, macrodomain hydrolysis of PARP14 marks, DNA-repair ubiquitylation, STAT1/IRF1 transcriptional control, and viral RNA sensing — are coordinated and selectively engaged in a given cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified structural model of the full PARP9/DTX3L(/PARP14) assembly in action\", \"Substrate-selection logic across DNA-repair versus IFN contexts undefined\", \"In vivo phenotypes of catalytically dead PARP9 not delineated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [9, 16]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [9, 15]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [15, 16]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 8, 12]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [12, 5]}\n    ],\n    \"complexes\": [\n      \"PARP9-DTX3L heterodimer\",\n      \"PARP9-DTX3L-PARP14 complex\"\n    ],\n    \"partners\": [\n      \"DTX3L\",\n      \"PARP14\",\n      \"STAT1\",\n      \"PARP1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":7,"faith_total":7,"faith_pct":100.0}}