{"gene":"PUM1","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2008,"finding":"Human PUM1 binds a core consensus sequence UGUAHAUA in the 3' UTRs of associated mRNAs; PUM1 knockdown demonstrated it enhances decay of associated mRNAs; PUM1 relocalizes to stress granules, consistent with a role in translational repression. Associated mRNAs are enriched for transcriptional regulators and cell cycle/proliferation genes.","method":"Ribonomic analysis (RIP-chip), genome-wide mRNA target identification, PUM1 knockdown, stress granule localization by imaging","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — genome-wide in vivo RIP, knockdown with mRNA stability readout, localization experiment; foundational paper with 131 citations","pmids":["18411299"],"is_preprint":false},{"year":2018,"finding":"Missense mutations in PUM1 reduce PUM1 protein levels (~25% in adult-onset, ~50% in infantile-onset cases), causing proportional upregulation of known PUM1 target mRNAs (including ATXN1), linking PUM1 haploinsufficiency to neurodegenerative and neurodevelopmental phenotypes. PUM1 functions as a post-transcriptional repressor whose dosage directly controls downstream target protein levels.","method":"Patient-derived cell studies, western blot, target mRNA/protein quantification in cells from individuals with PUM1 deletions or de novo missense variants","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple patient cell lines, orthogonal methods (protein quantification + target measurement), replicated across multiple mutation classes; 109 citations","pmids":["29474920"],"is_preprint":false},{"year":2019,"finding":"PUM1 and PUM2 repress translation of CDKN1B (p27) by binding Pumilio binding elements (PBEs) in the CDKN1B 3' UTR, promoting G1-S transition and cell proliferation. Pum1/Pum2 double-null mice show gene dosage-dependent body/organ size reductions rescued by Cdkn1b deficiency. PUM1 and PUM2 also engage in auto-regulatory and reciprocal post-transcriptional repression of each other.","method":"Mouse knockout genetics, translational reporter assays, epistasis (Pum1-/- x Cdkn1b-/- rescue), 3'UTR PBE binding assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — genetic epistasis, in vivo knockout, translational repression assay with defined PBE elements, double-mutant rescue","pmids":["30811992"],"is_preprint":false},{"year":2022,"finding":"PUM1 binds to the 3' UTR of TLR4 mRNA and suppresses TLR4 mRNA translation, thereby regulating NF-κB activity in human mesenchymal stem cells. PUM1 overexpression protects MSCs against H2O2-induced senescence and inflammation by suppressing TLR4-mediated NF-κB signaling.","method":"3'UTR binding assays, PUM1 overexpression/knockdown, western blot, NF-κB activity assay, in vivo OA mouse model with lentiviral PUM1 gene therapy","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — direct 3'UTR interaction, functional KD/OE with defined molecular pathway (TLR4-NF-κB), validated in vivo; 70 citations","pmids":["35034101"],"is_preprint":false},{"year":2017,"finding":"PUM1 acts as a biphasic negative regulator of innate immunity genes by repressing LGP2 expression. PUM1 knockdown triggers an initial upregulation of LGP2, CXCL10, IL6, and PKR (phase 1), followed by upregulation of RIG-I, MDA5, IFNβ, and other innate immunity genes (phase 2) downstream of LGP2. Simultaneous depletion of PUM1 and LGP2 abolished phase 1 and 2 gene upregulation. PUM2 depletion did not replicate this effect.","method":"siRNA knockdown of PUM1 and LGP2 (single and double), RT-qPCR, IFNβ functional assay (HSV-1 replication suppression)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — double-knockdown epistasis, specific pathway placement, PUM2 specificity control; 33 citations","pmids":["28760986"],"is_preprint":false},{"year":2019,"finding":"PUM1 binding to the 3' UTR of HOTAIR lncRNA decreases its half-life and steady-state level, thereby inhibiting trophoblast invasion. RNA-protein pull-down and mRNA stability assays confirmed PUM1 as a direct binding partner of HOTAIR mRNA. PUM1 overexpression impairs trophoblast invasion, while PUM1 knockdown enhances it, through HOTAIR upregulation.","method":"RIP, RNA pull-down, mRNA stability assay, trophoblast invasion assays, lncRNA transcriptome sequencing, villous explant culture model","journal":"Molecular therapy : the journal of the American Society of Gene Therapy","confidence":"High","confidence_rationale":"Tier 2 — direct RNA-protein binding shown by pull-down and RIP, mRNA stability assay, functional rescue, multiple orthogonal methods","pmids":["31862314"],"is_preprint":false},{"year":2020,"finding":"PUM1 promotes degradation of 48 specific target mRNAs. DNA-damaging agents (e.g., cisplatin) reduce PUM1 protein abundance, thereby relieving PUM1-mediated decay of PCNA and UBE2A mRNAs encoding translesion synthesis (TLS) factors, which activates TLS. PUM1 overexpression impairs TLS and increases cisplatin sensitivity.","method":"Transcriptome-wide mRNA stability analysis combined with PUM1 RIP-seq, PUM1 knockdown/overexpression, RNA-seq, cisplatin treatment","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — combined transcriptome-wide binding and stability data, functional validation with KD/OE and defined cellular phenotype","pmids":["32375027"],"is_preprint":false},{"year":2022,"finding":"PUM1 directly binds γ-globin (HBG1) mRNA, reducing its stability and translational efficiency, which contributes to the fetal-to-adult hemoglobin switch. PUM1 expression is regulated by erythroid master transcription factor EKLF/KLF1. PUM1 knockdown in human erythroid cells leads to ~22% HbF without affecting β-globin levels.","method":"RIP, mRNA stability assay, translational efficiency measurement, PUM1 knockdown in human erythroid cells, patient HbF measurement (PUM1 RNA-binding domain mutation)","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 2 — direct RNA binding confirmed by RIP, mRNA stability and translation assays, patient genetic validation; multiple orthogonal methods","pmids":["35667093"],"is_preprint":false},{"year":2018,"finding":"PUM1 and PUM2 exhibit mechanistically distinct modes of regulation of SIAH1 mRNA: PUM1 (unlike PUM2) exerts PBE-independent repression of SIAH1 3'UTR-dependent expression. The PUF domains of PUM1 and PUM2 show different EMSA complex formation patterns with SIAH1 3'UTRs. NANOS3 (but not NANOS2) directly binds SIAH1 3'UTR independently of PBEs or the PUF domain and cooperates with PUM1/PUM2 in repression.","method":"Luciferase reporter assays, EMSA, cooperativity assays with NANOS paralogues, NANOS patient mutation constructs","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 — EMSA plus reporter assays; single lab but multiple orthogonal approaches","pmids":["30269240"],"is_preprint":false},{"year":2021,"finding":"PUM1 binds the 3'UTR of LRP6 mRNA (verified by RNA pull-down, RIP, luciferase reporter), reducing LRP6 mRNA and protein levels, and thereby inhibiting trophoblast cell proliferation, migration, and invasion. PUM1 depletion-mediated promotion of trophoblast function was reversed by LRP6 knockdown.","method":"RNA pull-down, RNA immunoprecipitation, luciferase reporter assay, RT-qPCR, western blot, functional cell assays","journal":"Biochemistry and cell biology = Biochimie et biologie cellulaire","confidence":"Medium","confidence_rationale":"Tier 2 — direct RNA-protein binding by RIP and pull-down, epistasis rescue; single lab","pmids":["34734756"],"is_preprint":false},{"year":2019,"finding":"PUM1 knockdown in pancreatic cancer cells activates the PERK/eIF2/ATF4 signaling pathway (increased p-PERK, p-EIF2A, ATF4), suppressing proliferation, migration, invasion, and EMT. A PERK inhibitor reversed these effects, establishing a negative regulatory relationship between PUM1 and this stress-response pathway. PUM1 levels negatively correlate with p-PERK levels in PDAC tissues.","method":"cDNA microarrays, siRNA knockdown, western blot, in vitro and in vivo functional assays, PERK inhibitor rescue","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — KD with pathway analysis, inhibitor rescue, in vivo validation; single lab","pmids":["31395860"],"is_preprint":false},{"year":2022,"finding":"NANOS3 in complex with PUM1 causes 3'UTR-mediated repression of FOXM1 mRNA, a transcription factor critical for G2/M phase transition, thereby controlling G2/M progression in a human primordial germ cell model (TCam-2 cells). FOXM1 potentially acts as a transcriptional activator of NANOS3 and PUM1, suggesting a regulatory feedback loop.","method":"RNA-sequencing, 3'UTR luciferase reporter assay, NANOS3 and PUM1 overexpression in TCam-2 cells, cell cycle analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay and RNA-seq with defined cell cycle phenotype; single lab","pmids":["35743036"],"is_preprint":false},{"year":2020,"finding":"PUM1 forms distinct RNP regulatory networks (RNA regulons) compared to PUM2, associating with different sets of protein cofactors involved in RNA processing, despite recognizing the same RNA binding motif. PUM1 and PUM2 regulate partially non-overlapping pools of mRNAs in human male germ cells.","method":"RIP-Seq, RNA-Seq, global mass spectrometry-based protein interactome profiling (TCam-2 human male germ cell line)","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 — RIP-seq plus MS interactome; multiple orthogonal approaches in one study","pmids":["32316190"],"is_preprint":false},{"year":2021,"finding":"PUM1 represses CDKN1B (p27) protein expression through translational control (not mRNA level) in prostate cancer cells. PUM1 knockdown consistently elevated CDKN1B protein via increased translation but did not affect CDKN1B mRNA levels; PUM1 overexpression reduced CDKN1B protein.","method":"PUM1 knockdown/overexpression, western blot, polysome/translation assays, subcutaneous tumor xenograft","journal":"Journal of biomedical research","confidence":"Medium","confidence_rationale":"Tier 2 — translational control shown by protein vs. mRNA discordance with KD/OE; consistent with mouse data from PMID:30811992","pmids":["34531333"],"is_preprint":false},{"year":2023,"finding":"PUM1 binds directly to the DEPTOR mRNA pumilio response element (PRE), maintaining DEPTOR transcript stability and preventing its degradation. PUM1-mediated DEPTOR upregulation inhibits mTORC1 and relieves inhibitory feedback to PI3K, activating PI3K-Akt signaling and promoting glycolysis in gastric cancer cells.","method":"RNA-sequencing, bioinformatics, metabolomics, RNA immunoprecipitation, luciferase reporter assay, PUM1 knockdown/overexpression, in vivo xenograft","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 — direct RNA binding shown by RIP, mRNA stability assay, downstream pathway validated; single lab","pmids":["37469018"],"is_preprint":false},{"year":2014,"finding":"PUM1 silencing increased p27 expression and the amount of the p27-CDK2 complex in pancreatic cancer cells, consistent with PUM1-mediated translational repression of p27 (CDKN1B). PUM1 levels correlate inversely with p27 activity.","method":"PUM1 siRNA knockdown, western blot, immunoprecipitation of p27-CDK2 complex, cell proliferation assays","journal":"Phytomedicine : international journal of phytotherapy and phytopharmacology","confidence":"Low","confidence_rationale":"Tier 3 — single Co-IP/pulldown, partial mechanistic follow-up, single lab","pmids":["31128486"],"is_preprint":false},{"year":2025,"finding":"PUM1 binds KCNK3 mRNA and destabilizes it in pulmonary artery smooth muscle cells (PASMCs). HIF1α, activated by hypoxia, directly binds the PUM1 promoter to transcriptionally upregulate PUM1 expression, establishing a HIF1α-PUM1-KCNK3 regulatory axis driving pathological PASMC phenotypes. AAV9-mediated PUM1 knockdown attenuated pulmonary hypertension in vivo.","method":"ChIP (HIF1α binding to PUM1 promoter), RNA immunoprecipitation (PUM1-KCNK3 mRNA), mRNA stability assay, AAV9 knockdown in vivo rat PH models, PASMC functional assays","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter binding by ChIP, direct RNA binding by RIP, in vivo rescue; single lab, single publication","pmids":["41135634"],"is_preprint":false},{"year":2024,"finding":"PUM1's intrinsically disordered regions (IDRs) interact multivalently with distinct binding sites on the CCR4-NOT deadenylase complex to recruit it to target mRNAs and promote deadenylation. Phosphorylation within these IDRs tunes the deadenylation rate in a continuously graded manner. PUM1-mediated repression requires CCR4-NOT deadenylase activity and PABPC1/PABPC4, which stabilize poly(A) tails and modulate PUM1 repression in a concentration-dependent manner.","method":"Structural biology, biochemical reconstitution, in vitro deadenylation assays, phosphorylation mutagenesis, IDR binding mapping","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 — reconstitution and structural approaches with mutagenesis; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2025,"finding":"PUM1-mediated mRNA repression requires CCR4-NOT deadenylase and is dependent on PABPC1 and PABPC4; PUM1 associates with PABPCs, and in their absence, targets escape PUM1 control. PABPC abundance inversely tunes PUM repression in a concentration-dependent manner.","method":"Co-immunoprecipitation (PUM-PABPC association), mRNA decay assays, genetic depletion of deadenylase components and PABPCs, reporter assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein association and functional reconstitution with mechanistic follow-up; preprint","pmids":[],"is_preprint":true},{"year":2025,"finding":"PUM1 negatively regulates innate immunity gene expression both at steady state and during SARS-CoV-2 infection. PUM1 depletion slightly increases intracellular SARS-CoV-2 RNA levels, suggesting mild antiviral or indirect host-factor regulatory activity, but does not affect progeny virion production.","method":"PUM1 depletion (siRNA/shRNA), intracellular viral RNA quantification, innate immunity gene expression analysis, PRE binding analysis","journal":"The Journal of general virology","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined molecular and viral readouts; replicates earlier innate immunity finding from PMID:28760986","pmids":["40956600"],"is_preprint":false},{"year":2021,"finding":"PUM1 interacts with DDX5 mRNA 3' UTR and positively regulates DDX5 mRNA expression in cetuximab-resistant colon cancer cells. PUM1 knockout reduced DDX5 levels and decreased cell proliferation in resistant lines.","method":"CRISPR-Cas9 PUM1 and DDX5 knockout, qPCR, immunoblot, cell viability assays","journal":"Frontiers in cell and developmental biology","confidence":"Low","confidence_rationale":"Tier 3 — KO with mRNA level readout, no direct RNA-binding confirmation in this study","pmids":["34447749"],"is_preprint":false},{"year":2023,"finding":"PUM1 binds and stabilizes PAK6 mRNA in lung adenocarcinoma cells, as confirmed by RNA immunoprecipitation and luciferase assays. PUM1 silencing reduced PAK6 levels, promoted ferroptosis (elevated Fe2+ and MDA), and reduced tumor growth in vivo, effects reversed by PAK6 restoration.","method":"RNA immunoprecipitation, luciferase assay, PUM1 knockdown, ferroptosis markers (Fe2+, MDA), in vivo xenograft","journal":"Pathology, research and practice","confidence":"Low","confidence_rationale":"Tier 3 — direct RNA binding shown by RIP and reporter, single lab, single publication, limited mechanistic depth","pmids":["40694989"],"is_preprint":false},{"year":2015,"finding":"A gene trap mutation in the mouse Pum1 gene (Pum1XE002) results in loss of preimplantation embryos; no homozygous blastocysts are recovered, indicating an essential role for PUM1 in very early embryonic development or fertilization.","method":"Mouse gene trap, embryo genotyping, in vitro fertilization, embryo culture","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — defined genetic loss-of-function with specific preimplantation phenotype; ortholog (mouse)","pmids":["25896760"],"is_preprint":false}],"current_model":"PUM1 is a sequence-specific RNA-binding protein (binding the consensus UGUAHAUA in 3' UTRs of target mRNAs) that represses target gene expression post-transcriptionally by accelerating mRNA decay (via CCR4-NOT deadenylase recruitment, dependent on PABPC) and inhibiting translation; it controls a broad regulon including cell cycle regulators (CDKN1B/p27, FOXM1), immune regulators (LGP2 and downstream innate immunity genes), TLR4, KCNK3, DEPTOR, HOTAIR, γ-globin (HBG1), and others, with dosage-dependent effects on neuronal survival, body size, stem cell maintenance, erythropoiesis, and early embryogenesis, and its activity is modulated by phosphorylation of its intrinsically disordered regions and by cofactors including NANOS proteins."},"narrative":{"teleology":[{"year":2008,"claim":"Establishing PUM1 as a sequence-specific mRNA decay factor: genome-wide target identification revealed that PUM1 binds a UGUAHAUA consensus in 3′ UTRs and promotes turnover of hundreds of mRNAs enriched for cell-cycle and transcription regulators, filling the gap between Drosophila Pumilio biology and the human ortholog's direct RNA targets.","evidence":"RIP-chip in human cells with PUM1 knockdown and mRNA stability measurements","pmids":["18411299"],"confidence":"High","gaps":["Mechanism of mRNA decay acceleration (deadenylase vs. decapping) not resolved","Relative contribution of translational repression vs. decay not separated"]},{"year":2014,"claim":"Identification of CDKN1B/p27 as a key proliferative target: PUM1 silencing elevated p27 protein and the p27-CDK2 inhibitory complex, linking PUM1 to cell-cycle control through translational repression of a specific CDK inhibitor.","evidence":"siRNA knockdown, western blot, co-immunoprecipitation of p27-CDK2 in pancreatic cancer cells","pmids":["31128486"],"confidence":"Low","gaps":["Single Co-IP without reciprocal validation","Direct RNA binding to CDKN1B 3′ UTR not demonstrated in this study"]},{"year":2015,"claim":"Demonstration of an essential role in preimplantation development: Pum1 gene-trap homozygous embryos failed to survive past the preimplantation stage, establishing that PUM1 is indispensable for early mammalian embryogenesis.","evidence":"Mouse gene trap with embryo genotyping and in vitro fertilization","pmids":["25896760"],"confidence":"Medium","gaps":["Target mRNAs responsible for preimplantation lethality not identified","Whether phenotype reflects maternal or zygotic PUM1 requirement unclear"]},{"year":2017,"claim":"Placement of PUM1 as a negative regulator of innate immunity: double-knockdown epistasis showed PUM1 represses LGP2 mRNA, whose derepression triggers a biphasic cascade activating interferon and inflammatory genes, a function not shared by PUM2.","evidence":"siRNA double-knockdown of PUM1 and LGP2, RT-qPCR, HSV-1 functional assay in human cells","pmids":["28760986"],"confidence":"High","gaps":["Direct PUM1 binding to LGP2 3′ UTR not confirmed by RIP in this study","Whether PUM1 represses LGP2 via decay, translational inhibition, or both not resolved"]},{"year":2018,"claim":"Linking PUM1 dosage to human neurological disease: patient mutations reducing PUM1 protein by ~25–50% caused proportional derepression of targets including ATXN1, establishing PUM1 haploinsufficiency as a cause of neurodegenerative (adult-onset ataxia) and neurodevelopmental (infantile) syndromes.","evidence":"Patient-derived lymphoblastoid cells, western blot, target mRNA/protein quantification across multiple mutation classes","pmids":["29474920"],"confidence":"High","gaps":["Neuron-specific target regulon not fully defined","Whether ataxia phenotype can be rescued by ATXN1 reduction not tested"]},{"year":2018,"claim":"Revealing paralog-specific and NANOS-cooperative mechanisms: PUM1 represses SIAH1 in a PBE-independent manner distinct from PUM2, and NANOS3 cooperates with PUM1/PUM2 in 3′ UTR-mediated repression, demonstrating that cofactor identity determines target specificity.","evidence":"Luciferase reporter assays and EMSA with PUF domain constructs and NANOS paralogues","pmids":["30269240"],"confidence":"Medium","gaps":["PBE-independent binding mode structurally uncharacterized","Whether NANOS-PUM1 complex is direct or bridged by RNA not resolved"]},{"year":2019,"claim":"Genetic proof that PUM1/PUM2 control body size through CDKN1B: Pum1/Pum2 double-null mice showed dosage-dependent organ and body size reduction rescued by Cdkn1b co-deletion, confirming p27 as the critical downstream effector of Pumilio-mediated proliferative control.","evidence":"Mouse knockout epistasis (Pum1−/− × Cdkn1b−/−), translational reporter assays with PBE mutations","pmids":["30811992"],"confidence":"High","gaps":["Contribution of individual Pumilio paralogs to tissue-specific size control not separated","Translational vs. decay contribution to p27 regulation in vivo not dissected"]},{"year":2019,"claim":"Extending PUM1's regulon to non-coding RNA: PUM1 binds and destabilizes the lncRNA HOTAIR, reducing trophoblast invasion, showing that PUM1 post-transcriptional control extends beyond protein-coding mRNAs.","evidence":"RIP, RNA pull-down, mRNA stability assay, trophoblast invasion assays","pmids":["31862314"],"confidence":"High","gaps":["How PUM1 binding to lncRNA differs structurally from mRNA binding unknown","Whether HOTAIR destabilization involves CCR4-NOT not tested"]},{"year":2020,"claim":"Connecting PUM1 to DNA damage tolerance: DNA-damaging agents reduce PUM1 protein, relieving repression of translesion synthesis factor mRNAs (PCNA, UBE2A), thereby activating TLS—a regulatory circuit integrating genotoxic stress with post-transcriptional control.","evidence":"Transcriptome-wide mRNA stability analysis plus RIP-seq, PUM1 KD/OE, cisplatin treatment","pmids":["32375027"],"confidence":"High","gaps":["Mechanism of PUM1 protein downregulation by DNA damage not identified","Whether PUM1 regulation of TLS operates through deadenylation or translation not resolved"]},{"year":2020,"claim":"Distinguishing PUM1 and PUM2 regulons at the systems level: despite recognizing the same RNA motif, PUM1 and PUM2 associate with distinct protein cofactor sets and regulate partially non-overlapping mRNA pools in human germ cells.","evidence":"RIP-Seq, RNA-Seq, and mass spectrometry-based interactome profiling in TCam-2 cells","pmids":["32316190"],"confidence":"Medium","gaps":["Identity of PUM1-specific cofactors driving target selectivity not fully validated","Whether distinct regulons reflect competition or compartmentalization unknown"]},{"year":2022,"claim":"Defining PUM1 as a post-transcriptional regulator of the hemoglobin switch: PUM1 binds γ-globin (HBG1) mRNA and reduces both its stability and translational efficiency, contributing to fetal-to-adult hemoglobin switching, with PUM1 knockdown raising HbF ~22%.","evidence":"RIP, mRNA stability and translational efficiency assays in human erythroid cells, patient PUM1 mutation analysis","pmids":["35667093"],"confidence":"High","gaps":["Whether PUM1 is a tractable therapeutic target for HbF induction not established","Interaction with other HbF regulators (BCL11A, LRF) not explored"]},{"year":2022,"claim":"Demonstrating PUM1 suppression of TLR4–NF-κB inflammatory signaling: PUM1 binds TLR4 3′ UTR and represses its translation, protecting mesenchymal stem cells from senescence and inflammation.","evidence":"3′ UTR binding assays, PUM1 OE/KD, NF-κB activity assay, in vivo osteoarthritis mouse model with lentiviral gene therapy","pmids":["35034101"],"confidence":"High","gaps":["Whether TLR4 repression involves deadenylation or purely translational inhibition not determined"]},{"year":2024,"claim":"Elucidating the biochemical mechanism of repression: PUM1's intrinsically disordered regions make multivalent contacts with the CCR4-NOT deadenylase complex to drive deadenylation, with phosphorylation within these IDRs continuously tuning the rate; PABPC1/PABPC4 are required for PUM1-mediated mRNA decay and modulate repression in a concentration-dependent manner.","evidence":"Structural biology, in vitro reconstitution of deadenylation, phosphorylation mutagenesis (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint not yet peer-reviewed","In vivo relevance of graded phosphorylation tuning not demonstrated","Structural details of IDR–CCR4-NOT interface at atomic resolution not available"]},{"year":2025,"claim":"Establishing a hypoxia-driven PUM1–KCNK3 axis in pulmonary hypertension: HIF1α directly activates PUM1 transcription under hypoxia, and PUM1 in turn destabilizes KCNK3 mRNA in pulmonary artery smooth muscle cells, with in vivo PUM1 knockdown attenuating experimental pulmonary hypertension.","evidence":"ChIP for HIF1α on PUM1 promoter, RIP for PUM1–KCNK3 mRNA, AAV9 knockdown in rat PH model","pmids":["41135634"],"confidence":"Medium","gaps":["Whether KCNK3 is the sole effector of PUM1 in pulmonary hypertension not tested","Generalizability beyond rat model unknown"]},{"year":null,"claim":"Key unresolved questions include: the structural basis of PUM1's PBE-independent repression of certain targets; how PUM1-specific cofactors are selected to generate paralog-distinct regulons; and whether the graded phosphorylation-dependent tuning of CCR4-NOT recruitment operates in physiological contexts such as neuronal homeostasis and erythropoiesis.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of full-length PUM1 with IDRs bound to CCR4-NOT","Neuron-specific target regulon and its contribution to ataxia pathogenesis incompletely mapped","Therapeutic potential of modulating PUM1 activity for HbF induction or neurodegeneration untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,2,5,6,7,8,9,14,16]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,4,6,7,13]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0,5,6,7,16]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,5,6,7,14,16,17,18]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2,11,13,15]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,19]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,6,17,18]}],"complexes":["PUM1-NANOS3 complex","PUM1-CCR4-NOT complex"],"partners":["NANOS3","PABPC1","PABPC4","PUM2","CNOT1"],"other_free_text":[]},"mechanistic_narrative":"PUM1 is a sequence-specific RNA-binding protein that post-transcriptionally represses a broad regulon of mRNAs governing cell proliferation, innate immunity, germ cell development, and erythropoiesis. It recognizes a UGUAHAUA consensus (Pumilio Binding Element) in 3′ UTRs and represses target expression by accelerating mRNA deadenylation through recruitment of the CCR4-NOT complex—a process modulated by phosphorylation of PUM1's intrinsically disordered regions and dependent on PABPC1/PABPC4—and by inhibiting translation, as demonstrated for targets including CDKN1B/p27, TLR4, HBG1 (γ-globin), and KCNK3 [PMID:18411299, PMID:30811992, PMID:35034101, PMID:35667093]. PUM1 cooperates with NANOS cofactors to repress specific targets such as FOXM1 and SIAH1 and assembles into RNP regulons distinct from those of PUM2, reflecting paralog-specific cofactor associations [PMID:30269240, PMID:35743036, PMID:32316190]. Heterozygous loss-of-function mutations in PUM1 cause dosage-dependent neurodegenerative and neurodevelopmental disease by derepressing targets including ATXN1 [PMID:29474920]."},"prefetch_data":{"uniprot":{"accession":"Q14671","full_name":"Pumilio homolog 1","aliases":[],"length_aa":1186,"mass_kda":126.5,"function":"Sequence-specific RNA-binding protein that acts as a post-transcriptional repressor by binding the 3'-UTR of mRNA targets. Binds to an RNA consensus sequence, the Pumilio Response Element (PRE), 5'-UGUANAUA-3', that is related to the Nanos Response Element (NRE) (PubMed:18328718, PubMed:21397187, PubMed:21572425, PubMed:21653694). Mediates post-transcriptional repression of transcripts via different mechanisms: acts via direct recruitment of the CCR4-POP2-NOT deadenylase leading to translational inhibition and mRNA degradation (PubMed:22955276). Also mediates deadenylation-independent repression by promoting accessibility of miRNAs (PubMed:18776931, PubMed:20818387, PubMed:20860814, PubMed:22345517). Following growth factor stimulation, phosphorylated and binds to the 3'-UTR of CDKN1B/p27 mRNA, inducing a local conformational change that exposes miRNA-binding sites, promoting association of miR-221 and miR-222, efficient suppression of CDKN1B/p27 expression, and rapid entry to the cell cycle (PubMed:20818387). Acts as a post-transcriptional repressor of E2F3 mRNAs by binding to its 3'-UTR and facilitating miRNA regulation (PubMed:22345517, PubMed:29474920). Represses a program of genes necessary to maintain genomic stability such as key mitotic, DNA repair and DNA replication factors. Its ability to repress those target mRNAs is regulated by the lncRNA NORAD (non-coding RNA activated by DNA damage) which, due to its high abundance and multitude of PUMILIO binding sites, is able to sequester a significant fraction of PUM1 and PUM2 in the cytoplasm (PubMed:26724866). Involved in neuronal functions by regulating ATXN1 mRNA levels: acts by binding to the 3'-UTR of ATXN1 transcripts, leading to their down-regulation independently of the miRNA machinery (PubMed:25768905, PubMed:29474920). Plays a role in cytoplasmic sensing of viral infection (PubMed:25340845). In testis, acts as a post-transcriptional regulator of spermatogenesis by binding to the 3'-UTR of mRNAs coding for regulators of p53/TP53. Involved in embryonic stem cell renewal by facilitating the exit from the ground state: acts by targeting mRNAs coding for naive pluripotency transcription factors and accelerates their down-regulation at the onset of differentiation (By similarity). Binds specifically to miRNA MIR199A precursor, with PUM2, regulates miRNA MIR199A expression at a postranscriptional level (PubMed:28431233)","subcellular_location":"Cytoplasm; Cytoplasm, P-body; Cytoplasmic granule","url":"https://www.uniprot.org/uniprotkb/Q14671/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PUM1","classification":"Not Classified","n_dependent_lines":186,"n_total_lines":1208,"dependency_fraction":0.15397350993377484},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PUM1","total_profiled":1310},"omim":[{"mim_id":"620719","title":"NEURODEVELOPMENTAL DISORDER WITH MOTOR ABNORMALITIES, SEIZURES, AND FACIAL DYSMORPHISM; NEDMSF","url":"https://www.omim.org/entry/620719"},{"mim_id":"620174","title":"SPINOCEREBELLAR ATAXIA 27B, LATE-ONSET; SCA27B","url":"https://www.omim.org/entry/620174"},{"mim_id":"617930","title":"CHROMOSOME 1p35 DELETION SYNDROME","url":"https://www.omim.org/entry/617930"},{"mim_id":"617037","title":"NONCODING RNA ACTIVATED BY DNA DAMAGE; NORAD","url":"https://www.omim.org/entry/617037"},{"mim_id":"607205","title":"PUMILIO RNA BINDING FAMILY MEMBER 2; PUM2","url":"https://www.omim.org/entry/607205"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Cytosol","reliability":"Enhanced"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PUM1"},"hgnc":{"alias_symbol":["PUMH1","KIAA0099"],"prev_symbol":[]},"alphafold":{"accession":"Q14671","domains":[{"cath_id":"-","chopping":"841-921","consensus_level":"medium","plddt":96.9253,"start":841,"end":921},{"cath_id":"1.25.40","chopping":"1069-1175","consensus_level":"medium","plddt":92.5849,"start":1069,"end":1175}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14671","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14671-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14671-F1-predicted_aligned_error_v6.png","plddt_mean":52.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PUM1","jax_strain_url":"https://www.jax.org/strain/search?query=PUM1"},"sequence":{"accession":"Q14671","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14671.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14671/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14671"}},"corpus_meta":[{"pmid":"18411299","id":"PMC_18411299","title":"Ribonomic 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Molecular basis of disease","url":"https://pubmed.ncbi.nlm.nih.gov/41135634","citation_count":1,"is_preprint":false},{"pmid":"40956600","id":"PMC_40956600","title":"PUM2 binds SARS-CoV-2 RNA and PUM1 mildly reduces viral RNA levels, but neither protein affects progeny virus production.","date":"2025","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/40956600","citation_count":1,"is_preprint":false},{"pmid":"40694989","id":"PMC_40694989","title":"PUM1 enhances PAK6 mRNA stability and contributes to growth and ferroptosis resistance in lung adenocarcinoma cells.","date":"2025","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/40694989","citation_count":0,"is_preprint":false},{"pmid":"41908224","id":"PMC_41908224","title":"Evaluation of the circular RNA Pum1_0014, miRNA-146a, and miRNA-141-3p as biomarkers in PCOS.","date":"2026","source":"Journal of Taibah University Medical Sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41908224","citation_count":0,"is_preprint":false},{"pmid":"41912775","id":"PMC_41912775","title":"Fusobacterium nucleatum drives colorectal cancer progression through the circPTBP3/miR-760/PUM1 axis.","date":"2026","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/41912775","citation_count":0,"is_preprint":false},{"pmid":"33241107","id":"PMC_33241107","title":"Repression of PUM1-mediated mRNA decay activates translesion synthesis after DNA damage.","date":"2020","source":"Molecular & cellular oncology","url":"https://pubmed.ncbi.nlm.nih.gov/33241107","citation_count":0,"is_preprint":false},{"pmid":"41342067","id":"PMC_41342067","title":"Retraction Note: MiR-411-5p acts as a tumor suppressor in non-small cell lung cancer through targeting PUM1.","date":"2025","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41342067","citation_count":0,"is_preprint":false},{"pmid":"40666984","id":"PMC_40666984","title":"PUM2 binds SARS-CoV-2 RNA and PUM1 mildly reduces viral RNA levels, but neither protein affects progeny virus production.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40666984","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.27.691032","title":"Viral non-coding RNAs hijack host Pumilio proteins to regulate host transcripts","date":"2025-12-01","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.27.691032","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.02.680050","title":"Cytoplasmic poly-adenosine binding proteins modulate susceptibility of mRNAs to RNA-binding protein-directed decay","date":"2025-10-02","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.02.680050","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.11.681827","title":"PUMILIOs and m6A-ECT2/ECT3 share mRNA targets and exert opposing control over organogenesis","date":"2025-10-12","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.11.681827","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.18.618793","title":"Phosphorylation-dependent tuning of mRNA deadenylation rates","date":"2024-10-19","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.18.618793","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":30390,"output_tokens":5892,"usd":0.089775},"stage2":{"model":"claude-opus-4-6","input_tokens":9462,"output_tokens":3770,"usd":0.21234},"total_usd":0.302115,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"Human PUM1 binds a core consensus sequence UGUAHAUA in the 3' UTRs of associated mRNAs; PUM1 knockdown demonstrated it enhances decay of associated mRNAs; PUM1 relocalizes to stress granules, consistent with a role in translational repression. Associated mRNAs are enriched for transcriptional regulators and cell cycle/proliferation genes.\",\n      \"method\": \"Ribonomic analysis (RIP-chip), genome-wide mRNA target identification, PUM1 knockdown, stress granule localization by imaging\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide in vivo RIP, knockdown with mRNA stability readout, localization experiment; foundational paper with 131 citations\",\n      \"pmids\": [\"18411299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Missense mutations in PUM1 reduce PUM1 protein levels (~25% in adult-onset, ~50% in infantile-onset cases), causing proportional upregulation of known PUM1 target mRNAs (including ATXN1), linking PUM1 haploinsufficiency to neurodegenerative and neurodevelopmental phenotypes. PUM1 functions as a post-transcriptional repressor whose dosage directly controls downstream target protein levels.\",\n      \"method\": \"Patient-derived cell studies, western blot, target mRNA/protein quantification in cells from individuals with PUM1 deletions or de novo missense variants\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple patient cell lines, orthogonal methods (protein quantification + target measurement), replicated across multiple mutation classes; 109 citations\",\n      \"pmids\": [\"29474920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM1 and PUM2 repress translation of CDKN1B (p27) by binding Pumilio binding elements (PBEs) in the CDKN1B 3' UTR, promoting G1-S transition and cell proliferation. Pum1/Pum2 double-null mice show gene dosage-dependent body/organ size reductions rescued by Cdkn1b deficiency. PUM1 and PUM2 also engage in auto-regulatory and reciprocal post-transcriptional repression of each other.\",\n      \"method\": \"Mouse knockout genetics, translational reporter assays, epistasis (Pum1-/- x Cdkn1b-/- rescue), 3'UTR PBE binding assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic epistasis, in vivo knockout, translational repression assay with defined PBE elements, double-mutant rescue\",\n      \"pmids\": [\"30811992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PUM1 binds to the 3' UTR of TLR4 mRNA and suppresses TLR4 mRNA translation, thereby regulating NF-κB activity in human mesenchymal stem cells. PUM1 overexpression protects MSCs against H2O2-induced senescence and inflammation by suppressing TLR4-mediated NF-κB signaling.\",\n      \"method\": \"3'UTR binding assays, PUM1 overexpression/knockdown, western blot, NF-κB activity assay, in vivo OA mouse model with lentiviral PUM1 gene therapy\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct 3'UTR interaction, functional KD/OE with defined molecular pathway (TLR4-NF-κB), validated in vivo; 70 citations\",\n      \"pmids\": [\"35034101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PUM1 acts as a biphasic negative regulator of innate immunity genes by repressing LGP2 expression. PUM1 knockdown triggers an initial upregulation of LGP2, CXCL10, IL6, and PKR (phase 1), followed by upregulation of RIG-I, MDA5, IFNβ, and other innate immunity genes (phase 2) downstream of LGP2. Simultaneous depletion of PUM1 and LGP2 abolished phase 1 and 2 gene upregulation. PUM2 depletion did not replicate this effect.\",\n      \"method\": \"siRNA knockdown of PUM1 and LGP2 (single and double), RT-qPCR, IFNβ functional assay (HSV-1 replication suppression)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double-knockdown epistasis, specific pathway placement, PUM2 specificity control; 33 citations\",\n      \"pmids\": [\"28760986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM1 binding to the 3' UTR of HOTAIR lncRNA decreases its half-life and steady-state level, thereby inhibiting trophoblast invasion. RNA-protein pull-down and mRNA stability assays confirmed PUM1 as a direct binding partner of HOTAIR mRNA. PUM1 overexpression impairs trophoblast invasion, while PUM1 knockdown enhances it, through HOTAIR upregulation.\",\n      \"method\": \"RIP, RNA pull-down, mRNA stability assay, trophoblast invasion assays, lncRNA transcriptome sequencing, villous explant culture model\",\n      \"journal\": \"Molecular therapy : the journal of the American Society of Gene Therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct RNA-protein binding shown by pull-down and RIP, mRNA stability assay, functional rescue, multiple orthogonal methods\",\n      \"pmids\": [\"31862314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PUM1 promotes degradation of 48 specific target mRNAs. DNA-damaging agents (e.g., cisplatin) reduce PUM1 protein abundance, thereby relieving PUM1-mediated decay of PCNA and UBE2A mRNAs encoding translesion synthesis (TLS) factors, which activates TLS. PUM1 overexpression impairs TLS and increases cisplatin sensitivity.\",\n      \"method\": \"Transcriptome-wide mRNA stability analysis combined with PUM1 RIP-seq, PUM1 knockdown/overexpression, RNA-seq, cisplatin treatment\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — combined transcriptome-wide binding and stability data, functional validation with KD/OE and defined cellular phenotype\",\n      \"pmids\": [\"32375027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PUM1 directly binds γ-globin (HBG1) mRNA, reducing its stability and translational efficiency, which contributes to the fetal-to-adult hemoglobin switch. PUM1 expression is regulated by erythroid master transcription factor EKLF/KLF1. PUM1 knockdown in human erythroid cells leads to ~22% HbF without affecting β-globin levels.\",\n      \"method\": \"RIP, mRNA stability assay, translational efficiency measurement, PUM1 knockdown in human erythroid cells, patient HbF measurement (PUM1 RNA-binding domain mutation)\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct RNA binding confirmed by RIP, mRNA stability and translation assays, patient genetic validation; multiple orthogonal methods\",\n      \"pmids\": [\"35667093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PUM1 and PUM2 exhibit mechanistically distinct modes of regulation of SIAH1 mRNA: PUM1 (unlike PUM2) exerts PBE-independent repression of SIAH1 3'UTR-dependent expression. The PUF domains of PUM1 and PUM2 show different EMSA complex formation patterns with SIAH1 3'UTRs. NANOS3 (but not NANOS2) directly binds SIAH1 3'UTR independently of PBEs or the PUF domain and cooperates with PUM1/PUM2 in repression.\",\n      \"method\": \"Luciferase reporter assays, EMSA, cooperativity assays with NANOS paralogues, NANOS patient mutation constructs\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — EMSA plus reporter assays; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"30269240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PUM1 binds the 3'UTR of LRP6 mRNA (verified by RNA pull-down, RIP, luciferase reporter), reducing LRP6 mRNA and protein levels, and thereby inhibiting trophoblast cell proliferation, migration, and invasion. PUM1 depletion-mediated promotion of trophoblast function was reversed by LRP6 knockdown.\",\n      \"method\": \"RNA pull-down, RNA immunoprecipitation, luciferase reporter assay, RT-qPCR, western blot, functional cell assays\",\n      \"journal\": \"Biochemistry and cell biology = Biochimie et biologie cellulaire\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct RNA-protein binding by RIP and pull-down, epistasis rescue; single lab\",\n      \"pmids\": [\"34734756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM1 knockdown in pancreatic cancer cells activates the PERK/eIF2/ATF4 signaling pathway (increased p-PERK, p-EIF2A, ATF4), suppressing proliferation, migration, invasion, and EMT. A PERK inhibitor reversed these effects, establishing a negative regulatory relationship between PUM1 and this stress-response pathway. PUM1 levels negatively correlate with p-PERK levels in PDAC tissues.\",\n      \"method\": \"cDNA microarrays, siRNA knockdown, western blot, in vitro and in vivo functional assays, PERK inhibitor rescue\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with pathway analysis, inhibitor rescue, in vivo validation; single lab\",\n      \"pmids\": [\"31395860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NANOS3 in complex with PUM1 causes 3'UTR-mediated repression of FOXM1 mRNA, a transcription factor critical for G2/M phase transition, thereby controlling G2/M progression in a human primordial germ cell model (TCam-2 cells). FOXM1 potentially acts as a transcriptional activator of NANOS3 and PUM1, suggesting a regulatory feedback loop.\",\n      \"method\": \"RNA-sequencing, 3'UTR luciferase reporter assay, NANOS3 and PUM1 overexpression in TCam-2 cells, cell cycle analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay and RNA-seq with defined cell cycle phenotype; single lab\",\n      \"pmids\": [\"35743036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PUM1 forms distinct RNP regulatory networks (RNA regulons) compared to PUM2, associating with different sets of protein cofactors involved in RNA processing, despite recognizing the same RNA binding motif. PUM1 and PUM2 regulate partially non-overlapping pools of mRNAs in human male germ cells.\",\n      \"method\": \"RIP-Seq, RNA-Seq, global mass spectrometry-based protein interactome profiling (TCam-2 human male germ cell line)\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP-seq plus MS interactome; multiple orthogonal approaches in one study\",\n      \"pmids\": [\"32316190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PUM1 represses CDKN1B (p27) protein expression through translational control (not mRNA level) in prostate cancer cells. PUM1 knockdown consistently elevated CDKN1B protein via increased translation but did not affect CDKN1B mRNA levels; PUM1 overexpression reduced CDKN1B protein.\",\n      \"method\": \"PUM1 knockdown/overexpression, western blot, polysome/translation assays, subcutaneous tumor xenograft\",\n      \"journal\": \"Journal of biomedical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — translational control shown by protein vs. mRNA discordance with KD/OE; consistent with mouse data from PMID:30811992\",\n      \"pmids\": [\"34531333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PUM1 binds directly to the DEPTOR mRNA pumilio response element (PRE), maintaining DEPTOR transcript stability and preventing its degradation. PUM1-mediated DEPTOR upregulation inhibits mTORC1 and relieves inhibitory feedback to PI3K, activating PI3K-Akt signaling and promoting glycolysis in gastric cancer cells.\",\n      \"method\": \"RNA-sequencing, bioinformatics, metabolomics, RNA immunoprecipitation, luciferase reporter assay, PUM1 knockdown/overexpression, in vivo xenograft\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct RNA binding shown by RIP, mRNA stability assay, downstream pathway validated; single lab\",\n      \"pmids\": [\"37469018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PUM1 silencing increased p27 expression and the amount of the p27-CDK2 complex in pancreatic cancer cells, consistent with PUM1-mediated translational repression of p27 (CDKN1B). PUM1 levels correlate inversely with p27 activity.\",\n      \"method\": \"PUM1 siRNA knockdown, western blot, immunoprecipitation of p27-CDK2 complex, cell proliferation assays\",\n      \"journal\": \"Phytomedicine : international journal of phytotherapy and phytopharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP/pulldown, partial mechanistic follow-up, single lab\",\n      \"pmids\": [\"31128486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PUM1 binds KCNK3 mRNA and destabilizes it in pulmonary artery smooth muscle cells (PASMCs). HIF1α, activated by hypoxia, directly binds the PUM1 promoter to transcriptionally upregulate PUM1 expression, establishing a HIF1α-PUM1-KCNK3 regulatory axis driving pathological PASMC phenotypes. AAV9-mediated PUM1 knockdown attenuated pulmonary hypertension in vivo.\",\n      \"method\": \"ChIP (HIF1α binding to PUM1 promoter), RNA immunoprecipitation (PUM1-KCNK3 mRNA), mRNA stability assay, AAV9 knockdown in vivo rat PH models, PASMC functional assays\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding by ChIP, direct RNA binding by RIP, in vivo rescue; single lab, single publication\",\n      \"pmids\": [\"41135634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PUM1's intrinsically disordered regions (IDRs) interact multivalently with distinct binding sites on the CCR4-NOT deadenylase complex to recruit it to target mRNAs and promote deadenylation. Phosphorylation within these IDRs tunes the deadenylation rate in a continuously graded manner. PUM1-mediated repression requires CCR4-NOT deadenylase activity and PABPC1/PABPC4, which stabilize poly(A) tails and modulate PUM1 repression in a concentration-dependent manner.\",\n      \"method\": \"Structural biology, biochemical reconstitution, in vitro deadenylation assays, phosphorylation mutagenesis, IDR binding mapping\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution and structural approaches with mutagenesis; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PUM1-mediated mRNA repression requires CCR4-NOT deadenylase and is dependent on PABPC1 and PABPC4; PUM1 associates with PABPCs, and in their absence, targets escape PUM1 control. PABPC abundance inversely tunes PUM repression in a concentration-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation (PUM-PABPC association), mRNA decay assays, genetic depletion of deadenylase components and PABPCs, reporter assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein association and functional reconstitution with mechanistic follow-up; preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PUM1 negatively regulates innate immunity gene expression both at steady state and during SARS-CoV-2 infection. PUM1 depletion slightly increases intracellular SARS-CoV-2 RNA levels, suggesting mild antiviral or indirect host-factor regulatory activity, but does not affect progeny virion production.\",\n      \"method\": \"PUM1 depletion (siRNA/shRNA), intracellular viral RNA quantification, innate immunity gene expression analysis, PRE binding analysis\",\n      \"journal\": \"The Journal of general virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined molecular and viral readouts; replicates earlier innate immunity finding from PMID:28760986\",\n      \"pmids\": [\"40956600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PUM1 interacts with DDX5 mRNA 3' UTR and positively regulates DDX5 mRNA expression in cetuximab-resistant colon cancer cells. PUM1 knockout reduced DDX5 levels and decreased cell proliferation in resistant lines.\",\n      \"method\": \"CRISPR-Cas9 PUM1 and DDX5 knockout, qPCR, immunoblot, cell viability assays\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — KO with mRNA level readout, no direct RNA-binding confirmation in this study\",\n      \"pmids\": [\"34447749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PUM1 binds and stabilizes PAK6 mRNA in lung adenocarcinoma cells, as confirmed by RNA immunoprecipitation and luciferase assays. PUM1 silencing reduced PAK6 levels, promoted ferroptosis (elevated Fe2+ and MDA), and reduced tumor growth in vivo, effects reversed by PAK6 restoration.\",\n      \"method\": \"RNA immunoprecipitation, luciferase assay, PUM1 knockdown, ferroptosis markers (Fe2+, MDA), in vivo xenograft\",\n      \"journal\": \"Pathology, research and practice\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — direct RNA binding shown by RIP and reporter, single lab, single publication, limited mechanistic depth\",\n      \"pmids\": [\"40694989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A gene trap mutation in the mouse Pum1 gene (Pum1XE002) results in loss of preimplantation embryos; no homozygous blastocysts are recovered, indicating an essential role for PUM1 in very early embryonic development or fertilization.\",\n      \"method\": \"Mouse gene trap, embryo genotyping, in vitro fertilization, embryo culture\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined genetic loss-of-function with specific preimplantation phenotype; ortholog (mouse)\",\n      \"pmids\": [\"25896760\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PUM1 is a sequence-specific RNA-binding protein (binding the consensus UGUAHAUA in 3' UTRs of target mRNAs) that represses target gene expression post-transcriptionally by accelerating mRNA decay (via CCR4-NOT deadenylase recruitment, dependent on PABPC) and inhibiting translation; it controls a broad regulon including cell cycle regulators (CDKN1B/p27, FOXM1), immune regulators (LGP2 and downstream innate immunity genes), TLR4, KCNK3, DEPTOR, HOTAIR, γ-globin (HBG1), and others, with dosage-dependent effects on neuronal survival, body size, stem cell maintenance, erythropoiesis, and early embryogenesis, and its activity is modulated by phosphorylation of its intrinsically disordered regions and by cofactors including NANOS proteins.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PUM1 is a sequence-specific RNA-binding protein that post-transcriptionally represses a broad regulon of mRNAs governing cell proliferation, innate immunity, germ cell development, and erythropoiesis. It recognizes a UGUAHAUA consensus (Pumilio Binding Element) in 3′ UTRs and represses target expression by accelerating mRNA deadenylation through recruitment of the CCR4-NOT complex—a process modulated by phosphorylation of PUM1's intrinsically disordered regions and dependent on PABPC1/PABPC4—and by inhibiting translation, as demonstrated for targets including CDKN1B/p27, TLR4, HBG1 (γ-globin), and KCNK3 [PMID:18411299, PMID:30811992, PMID:35034101, PMID:35667093]. PUM1 cooperates with NANOS cofactors to repress specific targets such as FOXM1 and SIAH1 and assembles into RNP regulons distinct from those of PUM2, reflecting paralog-specific cofactor associations [PMID:30269240, PMID:35743036, PMID:32316190]. Heterozygous loss-of-function mutations in PUM1 cause dosage-dependent neurodegenerative and neurodevelopmental disease by derepressing targets including ATXN1 [PMID:29474920].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Establishing PUM1 as a sequence-specific mRNA decay factor: genome-wide target identification revealed that PUM1 binds a UGUAHAUA consensus in 3′ UTRs and promotes turnover of hundreds of mRNAs enriched for cell-cycle and transcription regulators, filling the gap between Drosophila Pumilio biology and the human ortholog's direct RNA targets.\",\n      \"evidence\": \"RIP-chip in human cells with PUM1 knockdown and mRNA stability measurements\",\n      \"pmids\": [\"18411299\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of mRNA decay acceleration (deadenylase vs. decapping) not resolved\", \"Relative contribution of translational repression vs. decay not separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of CDKN1B/p27 as a key proliferative target: PUM1 silencing elevated p27 protein and the p27-CDK2 inhibitory complex, linking PUM1 to cell-cycle control through translational repression of a specific CDK inhibitor.\",\n      \"evidence\": \"siRNA knockdown, western blot, co-immunoprecipitation of p27-CDK2 in pancreatic cancer cells\",\n      \"pmids\": [\"31128486\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation\", \"Direct RNA binding to CDKN1B 3′ UTR not demonstrated in this study\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstration of an essential role in preimplantation development: Pum1 gene-trap homozygous embryos failed to survive past the preimplantation stage, establishing that PUM1 is indispensable for early mammalian embryogenesis.\",\n      \"evidence\": \"Mouse gene trap with embryo genotyping and in vitro fertilization\",\n      \"pmids\": [\"25896760\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Target mRNAs responsible for preimplantation lethality not identified\", \"Whether phenotype reflects maternal or zygotic PUM1 requirement unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placement of PUM1 as a negative regulator of innate immunity: double-knockdown epistasis showed PUM1 represses LGP2 mRNA, whose derepression triggers a biphasic cascade activating interferon and inflammatory genes, a function not shared by PUM2.\",\n      \"evidence\": \"siRNA double-knockdown of PUM1 and LGP2, RT-qPCR, HSV-1 functional assay in human cells\",\n      \"pmids\": [\"28760986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct PUM1 binding to LGP2 3′ UTR not confirmed by RIP in this study\", \"Whether PUM1 represses LGP2 via decay, translational inhibition, or both not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linking PUM1 dosage to human neurological disease: patient mutations reducing PUM1 protein by ~25–50% caused proportional derepression of targets including ATXN1, establishing PUM1 haploinsufficiency as a cause of neurodegenerative (adult-onset ataxia) and neurodevelopmental (infantile) syndromes.\",\n      \"evidence\": \"Patient-derived lymphoblastoid cells, western blot, target mRNA/protein quantification across multiple mutation classes\",\n      \"pmids\": [\"29474920\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neuron-specific target regulon not fully defined\", \"Whether ataxia phenotype can be rescued by ATXN1 reduction not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealing paralog-specific and NANOS-cooperative mechanisms: PUM1 represses SIAH1 in a PBE-independent manner distinct from PUM2, and NANOS3 cooperates with PUM1/PUM2 in 3′ UTR-mediated repression, demonstrating that cofactor identity determines target specificity.\",\n      \"evidence\": \"Luciferase reporter assays and EMSA with PUF domain constructs and NANOS paralogues\",\n      \"pmids\": [\"30269240\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PBE-independent binding mode structurally uncharacterized\", \"Whether NANOS-PUM1 complex is direct or bridged by RNA not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genetic proof that PUM1/PUM2 control body size through CDKN1B: Pum1/Pum2 double-null mice showed dosage-dependent organ and body size reduction rescued by Cdkn1b co-deletion, confirming p27 as the critical downstream effector of Pumilio-mediated proliferative control.\",\n      \"evidence\": \"Mouse knockout epistasis (Pum1−/− × Cdkn1b−/−), translational reporter assays with PBE mutations\",\n      \"pmids\": [\"30811992\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of individual Pumilio paralogs to tissue-specific size control not separated\", \"Translational vs. decay contribution to p27 regulation in vivo not dissected\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extending PUM1's regulon to non-coding RNA: PUM1 binds and destabilizes the lncRNA HOTAIR, reducing trophoblast invasion, showing that PUM1 post-transcriptional control extends beyond protein-coding mRNAs.\",\n      \"evidence\": \"RIP, RNA pull-down, mRNA stability assay, trophoblast invasion assays\",\n      \"pmids\": [\"31862314\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PUM1 binding to lncRNA differs structurally from mRNA binding unknown\", \"Whether HOTAIR destabilization involves CCR4-NOT not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Connecting PUM1 to DNA damage tolerance: DNA-damaging agents reduce PUM1 protein, relieving repression of translesion synthesis factor mRNAs (PCNA, UBE2A), thereby activating TLS—a regulatory circuit integrating genotoxic stress with post-transcriptional control.\",\n      \"evidence\": \"Transcriptome-wide mRNA stability analysis plus RIP-seq, PUM1 KD/OE, cisplatin treatment\",\n      \"pmids\": [\"32375027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of PUM1 protein downregulation by DNA damage not identified\", \"Whether PUM1 regulation of TLS operates through deadenylation or translation not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Distinguishing PUM1 and PUM2 regulons at the systems level: despite recognizing the same RNA motif, PUM1 and PUM2 associate with distinct protein cofactor sets and regulate partially non-overlapping mRNA pools in human germ cells.\",\n      \"evidence\": \"RIP-Seq, RNA-Seq, and mass spectrometry-based interactome profiling in TCam-2 cells\",\n      \"pmids\": [\"32316190\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of PUM1-specific cofactors driving target selectivity not fully validated\", \"Whether distinct regulons reflect competition or compartmentalization unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defining PUM1 as a post-transcriptional regulator of the hemoglobin switch: PUM1 binds γ-globin (HBG1) mRNA and reduces both its stability and translational efficiency, contributing to fetal-to-adult hemoglobin switching, with PUM1 knockdown raising HbF ~22%.\",\n      \"evidence\": \"RIP, mRNA stability and translational efficiency assays in human erythroid cells, patient PUM1 mutation analysis\",\n      \"pmids\": [\"35667093\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PUM1 is a tractable therapeutic target for HbF induction not established\", \"Interaction with other HbF regulators (BCL11A, LRF) not explored\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating PUM1 suppression of TLR4–NF-κB inflammatory signaling: PUM1 binds TLR4 3′ UTR and represses its translation, protecting mesenchymal stem cells from senescence and inflammation.\",\n      \"evidence\": \"3′ UTR binding assays, PUM1 OE/KD, NF-κB activity assay, in vivo osteoarthritis mouse model with lentiviral gene therapy\",\n      \"pmids\": [\"35034101\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TLR4 repression involves deadenylation or purely translational inhibition not determined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Elucidating the biochemical mechanism of repression: PUM1's intrinsically disordered regions make multivalent contacts with the CCR4-NOT deadenylase complex to drive deadenylation, with phosphorylation within these IDRs continuously tuning the rate; PABPC1/PABPC4 are required for PUM1-mediated mRNA decay and modulate repression in a concentration-dependent manner.\",\n      \"evidence\": \"Structural biology, in vitro reconstitution of deadenylation, phosphorylation mutagenesis (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint not yet peer-reviewed\", \"In vivo relevance of graded phosphorylation tuning not demonstrated\", \"Structural details of IDR–CCR4-NOT interface at atomic resolution not available\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Establishing a hypoxia-driven PUM1–KCNK3 axis in pulmonary hypertension: HIF1α directly activates PUM1 transcription under hypoxia, and PUM1 in turn destabilizes KCNK3 mRNA in pulmonary artery smooth muscle cells, with in vivo PUM1 knockdown attenuating experimental pulmonary hypertension.\",\n      \"evidence\": \"ChIP for HIF1α on PUM1 promoter, RIP for PUM1–KCNK3 mRNA, AAV9 knockdown in rat PH model\",\n      \"pmids\": [\"41135634\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether KCNK3 is the sole effector of PUM1 in pulmonary hypertension not tested\", \"Generalizability beyond rat model unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis of PUM1's PBE-independent repression of certain targets; how PUM1-specific cofactors are selected to generate paralog-distinct regulons; and whether the graded phosphorylation-dependent tuning of CCR4-NOT recruitment operates in physiological contexts such as neuronal homeostasis and erythropoiesis.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of full-length PUM1 with IDRs bound to CCR4-NOT\", \"Neuron-specific target regulon and its contribution to ataxia pathogenesis incompletely mapped\", \"Therapeutic potential of modulating PUM1 activity for HbF induction or neurodegeneration untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 2, 5, 6, 7, 8, 9, 14, 16]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 4, 6, 7, 13]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 5, 6, 7, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 5, 6, 7, 14, 16, 17, 18]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2, 11, 13, 15]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 19]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 6, 17, 18]}\n    ],\n    \"complexes\": [\n      \"PUM1-NANOS3 complex\",\n      \"PUM1-CCR4-NOT complex\"\n    ],\n    \"partners\": [\n      \"NANOS3\",\n      \"PABPC1\",\n      \"PABPC4\",\n      \"PUM2\",\n      \"CNOT1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}