{"gene":"PUM2","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2001,"finding":"PUM2 contains a C-terminal PUM homology domain (PUM-HD) that binds RNA with high affinity (Kd ~6.5 nM); SELEX identified a consensus PUM2-binding element (PBE) [UGUANAUARNNNNBBBBSCCS] related to but distinct from the Drosophila Nanos response element.","method":"SELEX (iterative amplification-selection), recombinant protein binding assay","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding assay with defined Kd, SELEX consensus determination; single lab but multiple orthogonal biochemical methods","pmids":["11780640"],"is_preprint":false},{"year":2005,"finding":"Human PUM2 specifically recognizes the Drosophila Pumilio NRE RNA target; single-nucleotide changes in the NRE abolish PUM2 binding. PUM2 co-immunoprecipitates with DAZL and both proteins can bind the same RNA target (SDAD1 mRNA 3'UTR), forming a complex.","method":"Co-immunoprecipitation, RNA binding assay, mutagenesis of NRE","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus mutagenesis, single lab","pmids":["15607425"],"is_preprint":false},{"year":2005,"finding":"Human BOULE (BOL) forms homodimers and interacts with PUM2; the dimerization domain of BOL is required for interaction with PUM2. BOL and PUM2 form a complex on a subset of PUM2 RNA targets distinct from the PUM2-DAZL complex, indicating that protein interactions determine RNA target specificity.","method":"Co-immunoprecipitation, domain mapping, RNA binding assay","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with domain mapping and RNA binding assays, single lab","pmids":["15806553"],"is_preprint":false},{"year":2005,"finding":"PUM2 binds P2P-R mRNA via PUM2-binding elements in its 3'UTR; PUM2 pull-down confirmed physical association with P2P-R mRNA, representing the first confirmed mammalian mRNA target for a PUF protein.","method":"PUM2 pull-down combined with RT-PCR, 3'UTR sequence analysis","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct pulldown with RT-PCR confirmation, single lab, single method","pmids":["15617101"],"is_preprint":false},{"year":2011,"finding":"PUM2 physically binds the D-box of Aurora-A kinase, protecting it from APC/C(Cdh1)-mediated ubiquitination and degradation, while also enhancing Aurora-A kinase activity. In interphase, PUM2 is cytoplasmic and acts as a translational repressor; in mitosis it localizes to centrosomes and associates with Aurora-A.","method":"Co-immunoprecipitation, ubiquitination assay, kinase activity assay, overexpression/depletion, immunofluorescence localization","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal assays (Co-IP, ubiquitination, kinase activity, localization), single lab","pmids":["21589936"],"is_preprint":false},{"year":2018,"finding":"PUM2 represses translation of RUNX2 and JAK2 mRNAs by directly binding their 3'UTRs; depletion of PUM2 in mesenchymal stem cells blocks adipogenesis and enhances osteogenesis, and CRISPR/Cas9 Pum2 silencing in zebrafish inhibits lipid accumulation and induces excessive bone formation.","method":"3'UTR luciferase reporter assay, RNA immunoprecipitation, CRISPR/Cas9 gene silencing, in vivo zebrafish model","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct RNA binding (RIP), reporter assays, and in vivo loss-of-function, single lab with multiple orthogonal methods","pmids":["31595981"],"is_preprint":false},{"year":2018,"finding":"PUM1 and PUM2 show mechanistic differences in regulation of SIAH1 3'UTR: PUM1 represses SIAH1 in a PBE-independent manner whereas PUM2 requires PBEs. Their PUF domains form distinct EMSA complex patterns with SIAH1 3'UTRs. NANOS3, but not NANOS2, directly binds SIAH1 3'UTR independently of PBEs or PUF domain, representing first evidence of direct RNA binding by a NANOS protein.","method":"Luciferase reporter assay, EMSA, mutagenesis, NANOS mutant constructs","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — EMSA plus reporter assay plus mutagenesis, single lab","pmids":["30269240"],"is_preprint":false},{"year":2019,"finding":"PUM2 inhibits translation of Mff (mitochondrial fission factor) mRNA, thereby impairing mitochondrial fission and mitophagy. PUM2 levels increase with aging. CRISPR/Cas9-mediated Pum2 knockout in mouse muscles of elderly animals enhances mitochondrial fission and mitophagy and improves mitochondrial quality control.","method":"Multi-omics, translational profiling, CRISPR/Cas9 knockout, C. elegans genetic model (puf-8), mitochondrial morphology assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multi-omics plus genetic loss-of-function in two species, replicated across C. elegans and mouse","pmids":["30642763"],"is_preprint":false},{"year":2019,"finding":"PUM2 represses translation of Cdkn1b (p27) by binding PBEs in the Cdkn1b 3'UTR, promoting G1-S transition and cell proliferation. Pum1/Pum2 double mutant mice show gene dosage-dependent reductions in body and organ size; Cdkn1b deficiency partially rescues postnatal growth defects. PUM1 and PUM2 engage in auto-regulatory and reciprocal post-transcriptional repression.","method":"Genetic mouse knockout (null mutations), 3'UTR binding assays, genetic epistasis (Cdkn1b rescue)","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in mice with multiple dosage combinations and rescue experiment","pmids":["30811992"],"is_preprint":false},{"year":2019,"finding":"Pum2 is restricted to the soma of developing neurons and prevents PBE-containing mRNAs from entering axons. Introduction of PBEs into mRNAs with a β-actin zipcode prevents axonal localization and translation. Pum2 knockdown causes PBE-containing mRNAs to appear and be translated in axons, and results in axonal growth/branching defects in vivo and impaired axon regeneration in vitro.","method":"Reporter mRNA localization assay, Pum2 knockdown, in vivo neuronal imaging, axon regeneration assay","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization experiments, loss-of-function with defined phenotype, multiple orthogonal readouts, single lab","pmids":["31606248"],"is_preprint":false},{"year":2019,"finding":"PUM2 directly binds STARD13 3'UTR and competitively outcompetes miR-590-3p and miR-9 for binding, thereby protecting STARD13 mRNA and inhibiting osteosarcoma cell proliferation, migration, and stemness.","method":"RNA immunoprecipitation (RIP) with RNA-seq, luciferase reporter assay","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq plus luciferase assays for competitive binding, single lab","pmids":["30084199"],"is_preprint":false},{"year":2019,"finding":"PUM2 binds NRP-1 mRNA 3'UTR and competitively displaces miR-376a, increasing NRP-1 mRNA stability and expression, thereby promoting breast cancer cell stemness.","method":"RNA immunoprecipitation (RIP), luciferase reporter assay, knockdown/rescue experiments","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and luciferase reporter with functional rescue, single lab","pmids":["30909144"],"is_preprint":false},{"year":2019,"finding":"PUM2 directly binds BTG1 3'UTR as shown by RNA pull-down and RIP assays, repressing BTG1 expression and promoting glioblastoma cell proliferation and migration; BTG1 knockdown rescues the effect of PUM2 knockdown.","method":"RNA pull-down assay, RNA immunoprecipitation, shRNA knockdown, rescue experiment","journal":"Cell structure and function","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA pull-down plus RIP plus genetic rescue, single lab","pmids":["30787206"],"is_preprint":false},{"year":2019,"finding":"PUM2 is subject to SUMO2/3 modification; the SUMO E2 ligase UBE2I promotes PUM2 SUMOylation, which decreases PUM2 protein stability and its inhibitory effect on CEBPD mRNA, thereby inducing glioma vasculogenic mimicry.","method":"Co-immunoprecipitation, immunofluorescence, RIP assay, ChIP assay, luciferase assay","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus RIP plus functional assays, single lab","pmids":["32997416"],"is_preprint":false},{"year":2019,"finding":"PUM2 cooperativity in RNA binding is mediated by RNA secondary structure: binding of one PUM2 molecule redistributes RNA conformational states to enhance or inhibit access of additional PUM2 molecules. Equilibrium binding measurements across 68 RNAs with two to five PBEs demonstrated this RNA structural cooperativity (RSC) mechanism.","method":"Equilibrium binding measurements, statistical mechanical modeling, 68-RNA panel with varying structure stabilities","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative in vitro binding with systematic RNA panel and modeling, single lab but rigorous","pmids":["30914482"],"is_preprint":false},{"year":2020,"finding":"Pum2 mediates Sirt1 mRNA decay in cardiomyocytes via two PUM2 binding elements in the Sirt1 3'UTR; Pum2 overexpression promotes acetylation of LKB1 (by reducing Sirt1 mRNA), repressing AMPK pathway activity and promoting H/R-induced apoptosis.","method":"RIP, mRNA stability assay, overexpression/knockdown, western blot for AMPK/LKB1 pathway, rescue experiments","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP with pathway mechanistic follow-up, single lab","pmids":["32437714"],"is_preprint":false},{"year":2020,"finding":"The Pum2-Mff axis regulates mitochondrial quality control in acute ischemic kidney injury: Pum2 levels are inversely correlated with Mff protein, and Pum2 overexpression reduces ischemia-induced Mff upregulation, preserving mitochondrial homeostasis and protecting renal tubules.","method":"Western blot, overexpression in mouse model, mitochondrial respiration assay","journal":"Cell biology and toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model with overexpression and mechanistic readouts, single lab","pmids":["31993882"],"is_preprint":false},{"year":2020,"finding":"PUM2 interacts with SCAMP1-TV2 lncRNA; when SCAMP1-TV2 is downregulated, PUM2 binds INSM1 mRNA, promoting its degradation.","method":"RNA immunoprecipitation (RIP), RNA pull-down, co-immunoprecipitation","journal":"Frontiers in oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — RIP and RNA pulldown, single lab, mechanistic detail limited","pmids":["32670859"],"is_preprint":false},{"year":2020,"finding":"PUM1 and PUM2 form partially distinct RNP networks in human male germ cells (TCam-2): RIP-Seq identified different target mRNA pools and mass spectrometry identified distinct protein cofactors for PUM1 and PUM2, indicating paralog-specific regulation.","method":"RIP-Seq, RNA-Seq, mass spectrometry proteomics","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — orthogonal RIP-Seq, RNA-Seq, and MS in a single study; single lab","pmids":["32316190"],"is_preprint":false},{"year":2021,"finding":"PUM2 mediates packaging of miRNA-130a into exosomes in cancer-associated fibroblasts; PUM2 overexpression promotes and knockdown inhibits tumor growth in xenograft mice.","method":"Knockdown/overexpression, xenograft assay, exosome isolation and characterization","journal":"International journal of nanomedicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional knockdown/OE with xenograft, mechanism of packaging not biochemically detailed, single lab","pmids":["33542625"],"is_preprint":false},{"year":2021,"finding":"PUM2 binds PRDX6 promoter (via ChIP) and represses PRDX6 expression; lncRNA Mir9-3hg binds PUM2 and downregulates it, relieving PRDX6 repression and inhibiting ferroptosis in cardiomyocytes.","method":"RNA binding protein immunoprecipitation, chromatin immunoprecipitation (ChIP)","journal":"Nutrition, metabolism, and cardiovascular diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and ChIP establishing two distinct molecular interactions, single lab","pmids":["34953631"],"is_preprint":false},{"year":2022,"finding":"Pum2 directly binds and represses translation of Sox5, Bcl11b/Ctip2, and Rorβ mRNAs in developing mouse neocortex post-mitotically, shaping area-specific cytoarchitecture. Loss of Pum2 leads to expansion of subcerebral projection neurons (Sox5+Bcl11b+) at expense of layer IV neurons (Rorβ+) in somatosensory cortex, with corresponding changes in subcerebral connectivity.","method":"In utero electroporation, retrograde labeling, Pum2 KO mice (Pum2;Emx1-Cre), translational reporter assays, qRT-PCR, smFISH (negative for mRNA level change)","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo loss-of-function with connectivity tracing plus direct translational assays, replicated across multiple approaches in single study","pmids":["35262486"],"is_preprint":false},{"year":2022,"finding":"PUM2 aggravates I/R-induced neuroinflammation and brain damage by suppressing SIRT1 expression, which leads to reduced SLC7A11 levels and thereby promotes ferroptosis in neurons.","method":"MCAO/R mouse model, OGD/R cell model, knockdown/rescue, western blot, RT-qPCR","journal":"Molecular and cellular biochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — knockdown/OE with rescue experiments but no direct RNA binding assay shown, single lab","pmids":["35997855"],"is_preprint":false},{"year":2022,"finding":"PUM2 represses BTG3 expression by directly binding to the BTG3 3'UTR; PUM2 silencing inhibits proliferation and promotes apoptosis of HCC cells, effects reversed by BTG3 knockdown.","method":"Luciferase reporter assay, RNA binding protein immunoprecipitation, knockdown/rescue","journal":"Oncology letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay plus functional rescue, single lab","pmids":["36072004"],"is_preprint":false},{"year":2023,"finding":"PUM2 directly binds DLX5 mRNA (confirmed by RNA-IP) and represses its translation; PUM2 knockdown upregulates DLX5 and enhances osteogenic differentiation of mesenchymal stem cells.","method":"RNA-immunoprecipitation, 3'UTR reporter assay, osteogenic differentiation assays, in vivo calvarial defect model","journal":"Journal of biomedical science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP plus reporter assay plus in vivo model, single lab","pmids":["37088847"],"is_preprint":false},{"year":2023,"finding":"PUM2 promotes NEDD4 mRNA degradation by binding to the NEDD4 mRNA 3'UTR, leading to reduced NEDD4-mediated PTEN ubiquitination/degradation, PTEN accumulation, and ferroptosis in chondrocytes, exacerbating osteoarthritis progression.","method":"RNA immunoprecipitation, RNA pulldown, western blot, in vivo intra-articular injection model","journal":"Environmental toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and pulldown with mechanistic pathway rescue, single lab","pmids":["38733337"],"is_preprint":false},{"year":2023,"finding":"PUM2 binds EFEMP1 mRNA (confirmed by immunoprecipitation) to promote EFEMP1 expression; PUM2 overexpression inhibits VSMC proliferation/migration and prevents aortic dissection in an angiotensin II mouse model.","method":"Immunoprecipitation/RNA-IP, western blot, mouse aortic dissection model","journal":"Experimental cell research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single RNA-IP, single lab; mechanism of promoting (vs. repressing) expression not fully resolved","pmids":["37062520"],"is_preprint":false},{"year":2023,"finding":"PUM2 represses SOX2 mRNA stability via interaction with SOX2 mRNA; PUM2 is upregulated in hyperglycemia-induced endothelial exosomes and delivered to trophoblasts, impairing their proliferation and invasion.","method":"High-throughput RNA-seq, exosome isolation, PUM2-mRNA interaction assay, SOX2 rescue experiment","journal":"Human & experimental toxicology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — RNA-seq and rescue experiments, limited direct binding validation described, single lab","pmids":["36607285"],"is_preprint":false},{"year":2024,"finding":"SENP1 deSUMOylates PUM2 (confirmed by Ni2+-NTA pull-down and Co-IP), enhancing PUM2 stability; PUM2 then binds NRF2 mRNA 3'UTR and reduces NRF2 levels, diminishing transcription of glycolytic enzymes HK1 and GLUT1 in astrocytes under Alzheimer's disease conditions.","method":"Ni2+-NTA agarose bead pull-down, co-immunoprecipitation, RIP, luciferase reporter, APP/PS1 mouse model","journal":"Cell biology and toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical deSUMOylation assay plus RIP, single lab with multiple methods","pmids":["39794619"],"is_preprint":false},{"year":2024,"finding":"PUM2 binds FOXO3 mRNA 3'UTR (confirmed by RIP, RNA pull-down, and luciferase assay) and represses FOXO3 translation, promoting IL-1β-induced chondrocyte apoptosis and ROS generation.","method":"RNA immunoprecipitation, RNA pull-down, luciferase reporter assay, overexpression/knockdown","journal":"Heliyon","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — three orthogonal binding assays, single lab","pmids":["38356524"],"is_preprint":false},{"year":2024,"finding":"PUM2 destabilizes HDAC9 mRNA via direct binding (confirmed by RIP and RNA pull-down); PUM2 overexpression suppresses oxidative stress and promotes autophagy in DM-CIAKI by reducing HDAC9 expression.","method":"RNA immunoprecipitation, RNA pull-down, in vivo DM-CIAKI mouse model, western blot","journal":"Diabetes & metabolism journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP plus RNA pulldown plus in vivo model, single lab","pmids":["40930160"],"is_preprint":false},{"year":2025,"finding":"PUM2 directly binds SARS-CoV-2 RNA at conserved PREs; however, altering PUM2 levels does not affect progeny virion production. This is a negative mechanistic finding for antiviral function.","method":"RNA binding assay, PUM2 depletion/overexpression, viral titer measurement","journal":"The Journal of general virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA binding demonstrated plus functional virion output assay, single lab; negative result for antiviral function","pmids":["40956600"],"is_preprint":false},{"year":2025,"finding":"PUM2-mediated mRNA repression requires CCR4-NOT deadenylase and depends on PABPC1 and PABPC4: PUM2 associates with PABPCs, and in their absence mRNA targets become unstable independently of PUM. Increasing PABPC levels inhibits PUM2 activity in a concentration-dependent manner by protecting poly(A) tails from deadenylation.","method":"mRNA stability assay, PUM2 association assay, PABPC depletion/overexpression, deadenylase mutant analysis","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical assays in single preprint study, not yet peer-reviewed","pmids":["bio_10.1101_2025.10.02.680050"],"is_preprint":true},{"year":2025,"finding":"CircRERE promotes UHRF1 mRNA decay by interacting with PUM2 (validated by RNA-IP and RNA pull-down); this reduces UHRF1-mediated methylation of the Drp1 promoter, increasing Drp1 expression and mitochondrial fission/dysfunction in myocardial I/R injury.","method":"RNA immunoprecipitation, RNA pull-down, ChIP assay, I/R mouse model","journal":"Chinese medical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP, RNA pulldown, and ChIP for mechanistic pathway, single lab","pmids":["40887836"],"is_preprint":false},{"year":2025,"finding":"The Norad lncRNA sequesters Pum2 via Pum2-recognition sequences, reducing Pum2 binding to Mff mRNA; in neurons after OGD/R, Norad levels increase and Pum2 binding to Mff mRNA decreases, elevating Mff protein and causing mitochondrial fragmentation. Pum2 overexpression reduces Mff levels, restores mitochondrial morphology, and improves outcomes in MCAO/R mice.","method":"RIP, overexpression in OGD/R and MCAO/R models, mitochondrial morphology assay, neurobehavioral assessment","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP plus in vivo overexpression with functional readouts, single lab","pmids":["39832611"],"is_preprint":false},{"year":2025,"finding":"IGF2BP2 KH1-4 domains directly bind the CPSF6-RS domain (confirmed by GST pull-down and IP/MS), recruiting CPSF6 to m6A-modified PUM2 pre-mRNA and promoting use of a proximal polyadenylation signal, generating a shorter, more stable PUM2 transcript that promotes malignant progression of ovarian cancer.","method":"RNA pull-down with biotin-labelled m6A, immunoprecipitation, mass spectrometry, GST pull-down, PAS-seq, eCLIP-seq, RIP-seq, meRIP-seq, 3'RACE, RNA stability assay, dual luciferase reporter","journal":"Clinical and translational medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biochemical and sequencing methods establishing mechanism of PUM2 mRNA regulation, single lab but very rigorous","pmids":["40629911"],"is_preprint":false}],"current_model":"PUM2 is a conserved PUF-family RNA-binding protein that uses its C-terminal PUM homology domain to bind Pumilio-binding elements (PBEs/PREs) in the 3'UTRs of target mRNAs, repressing their translation or promoting their degradation via recruitment of CCR4-NOT deadenylase in a PABPC-dependent manner; it regulates a broad range of biological processes including mitochondrial fission/mitophagy (via Mff mRNA repression), cell cycle progression (via Cdkn1b repression), axonal mRNA exclusion, neocortical cytoarchitecture (via Sox5/Bcl11b/Rorβ translational control), and stem cell differentiation (via RUNX2/JAK2/DLX5 repression), while in mitosis it moonlights as a binding partner and activator of Aurora-A kinase at centrosomes, and is itself regulated by SUMOylation (by UBE2I) and by sequestration through lncRNAs such as Norad."},"narrative":{"mechanistic_narrative":"PUM2 is a conserved PUF-family sequence-specific RNA-binding protein that uses its C-terminal PUM homology domain to recognize a defined Pumilio-binding element (PBE, consensus UGUANAUA...) in target mRNA 3'UTRs with nanomolar affinity, thereby controlling translation and stability of broad regulatory programs [PMID:11780640]. Cooperative occupancy of multi-PBE targets is shaped by RNA secondary structure, which redistributes conformational states to favor or impede additional PUM2 binding [PMID:30914482]. Mechanistically, PUM2-mediated repression requires the CCR4-NOT deadenylase and depends on poly(A)-binding proteins PABPC1/PABPC4: PUM2 associates with PABPCs and high PABPC levels protect poly(A) tails to limit PUM2 activity [PMID:bio_10.1101_2025.10.02.680050]. Through this 3'UTR-directed repression PUM2 governs mitochondrial fission and mitophagy by repressing Mff mRNA [PMID:30642763], cell-cycle progression by repressing Cdkn1b/p27 [PMID:30811992], neuronal cytoarchitecture by translationally controlling Sox5, Bcl11b, and Rorβ in developing neocortex [PMID:35262486], somatodendritic exclusion of PBE-containing mRNAs from axons [PMID:31606248], and stem-cell fate via repression of RUNX2, JAK2, and DLX5 [PMID:31595981, PMID:37088847]. Beyond repression, PUM2 can stabilize transcripts by competing with miRNAs for shared 3'UTR sites [PMID:30084199, PMID:30909144], and during mitosis it relocalizes from the cytoplasm to centrosomes where it binds the Aurora-A D-box, protecting Aurora-A from APC/C(Cdh1)-mediated degradation while enhancing its kinase activity [PMID:21589936]. PUM2 protein levels and activity are themselves controlled by SUMOylation through UBE2I (reversed by SENP1) [PMID:32997416, PMID:39794619] and by sequestration through lncRNAs including Norad, which titrates PUM2 away from Mff mRNA [PMID:39832611]; PUM2 transcript abundance is further set by m6A-dependent alternative polyadenylation driven by IGF2BP2/CPSF6 [PMID:40629911]. PUM2 forms paralog-distinct and cofactor-specific RNP networks together with PUM1, DAZL, and BOULE, with protein partners helping determine target specificity [PMID:15607425, PMID:15806553, PMID:32316190].","teleology":[{"year":2001,"claim":"Establishing that human PUM2 is a bona fide sequence-specific RNA binder defined the molecular basis for all downstream target recognition.","evidence":"SELEX and recombinant protein binding assays defining the PBE consensus and nanomolar affinity","pmids":["11780640"],"confidence":"High","gaps":["Did not identify endogenous mRNA targets","No structural model of the PUM-HD bound to RNA in this study"]},{"year":2005,"claim":"Identifying PUM2 protein partners and the first mammalian mRNA target showed that PUM2 acts within combinatorial RNP complexes whose composition tunes target specificity.","evidence":"Reciprocal Co-IP and RNA-binding assays for DAZL and BOULE, plus pull-down/RT-PCR confirming the P2P-R mRNA target","pmids":["15607425","15806553","15617101"],"confidence":"Medium","gaps":["Functional consequence of PUM2-DAZL/BOULE complexes on translation not quantified","Single-lab Co-IP evidence for partners"]},{"year":2011,"claim":"Discovery of a centrosomal, kinase-stabilizing role revealed that PUM2 has a non-canonical, RNA-independent moonlighting function in mitosis.","evidence":"Co-IP, ubiquitination and kinase activity assays, and immunofluorescence showing PUM2 binds the Aurora-A D-box and blocks APC/C(Cdh1) degradation","pmids":["21589936"],"confidence":"High","gaps":["Structural basis of D-box recognition not resolved","Relationship between RNA-binding and centrosomal functions unknown"]},{"year":2019,"claim":"Genetic loss-of-function across species defined physiological repression programs, establishing PUM2 control of mitochondrial fission (Mff), proliferation (Cdkn1b), and axonal mRNA exclusion.","evidence":"CRISPR/Cas9 knockouts in mouse and C. elegans, gene-dosage and Cdkn1b epistasis in mice, and reporter mRNA localization with Pum2 knockdown in neurons","pmids":["30642763","30811992","31606248"],"confidence":"High","gaps":["Direct deadenylation/repression mechanism not yet biochemically dissected in these systems","Tissue-specific target hierarchies incompletely mapped"]},{"year":2019,"claim":"Quantitative binding studies showed that PUM2 occupancy of multi-site targets is not independent but governed by RNA structural cooperativity.","evidence":"Equilibrium binding across a 68-RNA panel with statistical mechanical modeling","pmids":["30914482"],"confidence":"High","gaps":["Whether RNA structural cooperativity operates on endogenous targets in cells not shown"]},{"year":2019,"claim":"PUM2 was shown to also act as a stabilizer by competing with miRNAs for shared 3'UTR sites, broadening its regulatory repertoire beyond repression.","evidence":"RIP/RIP-seq and luciferase assays showing PUM2 displaces miR-590-3p/miR-9 (STARD13) and miR-376a (NRP-1)","pmids":["30084199","30909144"],"confidence":"Medium","gaps":["Determinants of repressive versus stabilizing outcome not defined","Competition shown in cancer cell lines only"]},{"year":2020,"claim":"Mapping paralog-specific RNP networks distinguished PUM2 from PUM1 in target pools and protein cofactors.","evidence":"RIP-Seq, RNA-Seq, and mass-spectrometry proteomics in human germ cells","pmids":["32316190","30269240"],"confidence":"Medium","gaps":["Mechanistic basis of paralog-specific cofactor recruitment unresolved"]},{"year":2022,"claim":"PUM2 was established as a post-mitotic translational regulator that shapes neocortical area identity and connectivity.","evidence":"Pum2 KO mice, in utero electroporation, retrograde tracing, and translational reporter assays for Sox5/Bcl11b/Rorβ","pmids":["35262486"],"confidence":"High","gaps":["Upstream control of PUM2 activity timing in cortical neurons unknown"]},{"year":2024,"claim":"Defining SUMOylation/deSUMOylation control showed PUM2 abundance and activity are post-translationally gated by the SUMO machinery.","evidence":"Co-IP, Ni2+-NTA pull-down, and RIP showing UBE2I-mediated SUMOylation destabilizes PUM2 while SENP1 deSUMOylation stabilizes it","pmids":["32997416","39794619"],"confidence":"Medium","gaps":["SUMO acceptor residues not mapped","How SUMO state alters target selection unclear"]},{"year":2025,"claim":"Reconstitution of the repression machinery defined the effector mechanism: PUM2 represses via CCR4-NOT in a PABPC-dependent manner.","evidence":"mRNA stability assays, PUM2-PABPC association, PABPC depletion/overexpression, and deadenylase mutant analysis (preprint)","pmids":["bio_10.1101_2025.10.02.680050"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Structural picture of the PUM2-CCR4-NOT-PABPC assembly absent"]},{"year":2025,"claim":"lncRNA sequestration and m6A-dependent alternative polyadenylation were shown to regulate PUM2 availability and transcript stability, adding upstream layers of control.","evidence":"RIP and in vivo models for Norad sequestration from Mff mRNA, and PAS-seq/eCLIP/RIP-seq showing IGF2BP2-CPSF6 m6A-driven proximal polyadenylation of PUM2 pre-mRNA","pmids":["39832611","40629911"],"confidence":"Medium","gaps":["Quantitative contribution of lncRNA titration to physiological PUM2 output not established"]},{"year":null,"claim":"How PUM2's RNA-dependent repressor function and its RNA-independent centrosomal/kinase-activating role are coordinated within a single protein remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model linking PUM-HD RNA binding to Aurora-A interaction","Cell-cycle switch governing PUM2 cytoplasmic-to-centrosomal relocalization unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,14,32]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[5,9,21,29]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,32]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[8,4]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[21,9,5]}],"complexes":["CCR4-NOT"],"partners":["PABPC1","PABPC4","AURKA","DAZL","BOLL","PUM1","UBE2I","SENP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8TB72","full_name":"Pumilio homolog 2","aliases":[],"length_aa":1066,"mass_kda":114.2,"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:21397187). 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:22345517). Acts as a post-transcriptional repressor of E2F3 mRNAs by binding to its 3'-UTR and facilitating miRNA regulation (PubMed:22345517). Plays a role in cytoplasmic sensing of viral infection (PubMed:25340845). 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). May regulate DCUN1D3 mRNA levels (PubMed:25349211). May support proliferation and self-renewal of stem cells. Binds specifically to miRNA MIR199A precursor, with PUM1, regulates miRNA MIR199A expression at a postranscriptional level (PubMed:28431233)","subcellular_location":"Cytoplasm; Cytoplasmic granule; Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/Q8TB72/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PUM2","classification":"Not Classified","n_dependent_lines":40,"n_total_lines":1208,"dependency_fraction":0.033112582781456956},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PSMA5","stoichiometry":0.2},{"gene":"PSMG3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PUM2","total_profiled":1310},"omim":[{"mim_id":"617037","title":"NONCODING RNA ACTIVATED BY DNA DAMAGE; NORAD","url":"https://www.omim.org/entry/617037"},{"mim_id":"616167","title":"DCN1 DOMAIN-CONTAINING PROTEIN 3; DCUN1D3","url":"https://www.omim.org/entry/616167"},{"mim_id":"608226","title":"NANOS C2HC-TYPE ZINC FINGER 1; NANOS1","url":"https://www.omim.org/entry/608226"},{"mim_id":"607205","title":"PUMILIO RNA BINDING FAMILY MEMBER 2; PUM2","url":"https://www.omim.org/entry/607205"},{"mim_id":"607204","title":"PUMILIO RNA BINDING FAMILY MEMBER 1; PUM1","url":"https://www.omim.org/entry/607204"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PUM2"},"hgnc":{"alias_symbol":["PUMH2","KIAA0235"],"prev_symbol":[]},"alphafold":{"accession":"Q8TB72","domains":[{"cath_id":"1.10.220","chopping":"709-800","consensus_level":"medium","plddt":96.2328,"start":709,"end":800},{"cath_id":"1.20.930","chopping":"962-1058","consensus_level":"medium","plddt":89.6295,"start":962,"end":1058}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TB72","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TB72-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TB72-F1-predicted_aligned_error_v6.png","plddt_mean":55.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PUM2","jax_strain_url":"https://www.jax.org/strain/search?query=PUM2"},"sequence":{"accession":"Q8TB72","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TB72.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TB72/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TB72"}},"corpus_meta":[{"pmid":"30642763","id":"PMC_30642763","title":"The 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protein binding assay\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding assay with defined Kd, SELEX consensus determination; single lab but multiple orthogonal biochemical methods\",\n      \"pmids\": [\"11780640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human PUM2 specifically recognizes the Drosophila Pumilio NRE RNA target; single-nucleotide changes in the NRE abolish PUM2 binding. PUM2 co-immunoprecipitates with DAZL and both proteins can bind the same RNA target (SDAD1 mRNA 3'UTR), forming a complex.\",\n      \"method\": \"Co-immunoprecipitation, RNA binding assay, mutagenesis of NRE\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus mutagenesis, single lab\",\n      \"pmids\": [\"15607425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human BOULE (BOL) forms homodimers and interacts with PUM2; the dimerization domain of BOL is required for interaction with PUM2. BOL and PUM2 form a complex on a subset of PUM2 RNA targets distinct from the PUM2-DAZL complex, indicating that protein interactions determine RNA target specificity.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, RNA binding assay\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with domain mapping and RNA binding assays, single lab\",\n      \"pmids\": [\"15806553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PUM2 binds P2P-R mRNA via PUM2-binding elements in its 3'UTR; PUM2 pull-down confirmed physical association with P2P-R mRNA, representing the first confirmed mammalian mRNA target for a PUF protein.\",\n      \"method\": \"PUM2 pull-down combined with RT-PCR, 3'UTR sequence analysis\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct pulldown with RT-PCR confirmation, single lab, single method\",\n      \"pmids\": [\"15617101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PUM2 physically binds the D-box of Aurora-A kinase, protecting it from APC/C(Cdh1)-mediated ubiquitination and degradation, while also enhancing Aurora-A kinase activity. In interphase, PUM2 is cytoplasmic and acts as a translational repressor; in mitosis it localizes to centrosomes and associates with Aurora-A.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, kinase activity assay, overexpression/depletion, immunofluorescence localization\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal assays (Co-IP, ubiquitination, kinase activity, localization), single lab\",\n      \"pmids\": [\"21589936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PUM2 represses translation of RUNX2 and JAK2 mRNAs by directly binding their 3'UTRs; depletion of PUM2 in mesenchymal stem cells blocks adipogenesis and enhances osteogenesis, and CRISPR/Cas9 Pum2 silencing in zebrafish inhibits lipid accumulation and induces excessive bone formation.\",\n      \"method\": \"3'UTR luciferase reporter assay, RNA immunoprecipitation, CRISPR/Cas9 gene silencing, in vivo zebrafish model\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA binding (RIP), reporter assays, and in vivo loss-of-function, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"31595981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PUM1 and PUM2 show mechanistic differences in regulation of SIAH1 3'UTR: PUM1 represses SIAH1 in a PBE-independent manner whereas PUM2 requires PBEs. Their PUF domains form distinct EMSA complex patterns with SIAH1 3'UTRs. NANOS3, but not NANOS2, directly binds SIAH1 3'UTR independently of PBEs or PUF domain, representing first evidence of direct RNA binding by a NANOS protein.\",\n      \"method\": \"Luciferase reporter assay, EMSA, mutagenesis, NANOS mutant constructs\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — EMSA plus reporter assay plus mutagenesis, single lab\",\n      \"pmids\": [\"30269240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM2 inhibits translation of Mff (mitochondrial fission factor) mRNA, thereby impairing mitochondrial fission and mitophagy. PUM2 levels increase with aging. CRISPR/Cas9-mediated Pum2 knockout in mouse muscles of elderly animals enhances mitochondrial fission and mitophagy and improves mitochondrial quality control.\",\n      \"method\": \"Multi-omics, translational profiling, CRISPR/Cas9 knockout, C. elegans genetic model (puf-8), mitochondrial morphology assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multi-omics plus genetic loss-of-function in two species, replicated across C. elegans and mouse\",\n      \"pmids\": [\"30642763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM2 represses translation of Cdkn1b (p27) by binding PBEs in the Cdkn1b 3'UTR, promoting G1-S transition and cell proliferation. Pum1/Pum2 double mutant mice show gene dosage-dependent reductions in body and organ size; Cdkn1b deficiency partially rescues postnatal growth defects. PUM1 and PUM2 engage in auto-regulatory and reciprocal post-transcriptional repression.\",\n      \"method\": \"Genetic mouse knockout (null mutations), 3'UTR binding assays, genetic epistasis (Cdkn1b rescue)\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in mice with multiple dosage combinations and rescue experiment\",\n      \"pmids\": [\"30811992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Pum2 is restricted to the soma of developing neurons and prevents PBE-containing mRNAs from entering axons. Introduction of PBEs into mRNAs with a β-actin zipcode prevents axonal localization and translation. Pum2 knockdown causes PBE-containing mRNAs to appear and be translated in axons, and results in axonal growth/branching defects in vivo and impaired axon regeneration in vitro.\",\n      \"method\": \"Reporter mRNA localization assay, Pum2 knockdown, in vivo neuronal imaging, axon regeneration assay\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments, loss-of-function with defined phenotype, multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"31606248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM2 directly binds STARD13 3'UTR and competitively outcompetes miR-590-3p and miR-9 for binding, thereby protecting STARD13 mRNA and inhibiting osteosarcoma cell proliferation, migration, and stemness.\",\n      \"method\": \"RNA immunoprecipitation (RIP) with RNA-seq, luciferase reporter assay\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq plus luciferase assays for competitive binding, single lab\",\n      \"pmids\": [\"30084199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM2 binds NRP-1 mRNA 3'UTR and competitively displaces miR-376a, increasing NRP-1 mRNA stability and expression, thereby promoting breast cancer cell stemness.\",\n      \"method\": \"RNA immunoprecipitation (RIP), luciferase reporter assay, knockdown/rescue experiments\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and luciferase reporter with functional rescue, single lab\",\n      \"pmids\": [\"30909144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM2 directly binds BTG1 3'UTR as shown by RNA pull-down and RIP assays, repressing BTG1 expression and promoting glioblastoma cell proliferation and migration; BTG1 knockdown rescues the effect of PUM2 knockdown.\",\n      \"method\": \"RNA pull-down assay, RNA immunoprecipitation, shRNA knockdown, rescue experiment\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA pull-down plus RIP plus genetic rescue, single lab\",\n      \"pmids\": [\"30787206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM2 is subject to SUMO2/3 modification; the SUMO E2 ligase UBE2I promotes PUM2 SUMOylation, which decreases PUM2 protein stability and its inhibitory effect on CEBPD mRNA, thereby inducing glioma vasculogenic mimicry.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, RIP assay, ChIP assay, luciferase assay\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus RIP plus functional assays, single lab\",\n      \"pmids\": [\"32997416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PUM2 cooperativity in RNA binding is mediated by RNA secondary structure: binding of one PUM2 molecule redistributes RNA conformational states to enhance or inhibit access of additional PUM2 molecules. Equilibrium binding measurements across 68 RNAs with two to five PBEs demonstrated this RNA structural cooperativity (RSC) mechanism.\",\n      \"method\": \"Equilibrium binding measurements, statistical mechanical modeling, 68-RNA panel with varying structure stabilities\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative in vitro binding with systematic RNA panel and modeling, single lab but rigorous\",\n      \"pmids\": [\"30914482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Pum2 mediates Sirt1 mRNA decay in cardiomyocytes via two PUM2 binding elements in the Sirt1 3'UTR; Pum2 overexpression promotes acetylation of LKB1 (by reducing Sirt1 mRNA), repressing AMPK pathway activity and promoting H/R-induced apoptosis.\",\n      \"method\": \"RIP, mRNA stability assay, overexpression/knockdown, western blot for AMPK/LKB1 pathway, rescue experiments\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP with pathway mechanistic follow-up, single lab\",\n      \"pmids\": [\"32437714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The Pum2-Mff axis regulates mitochondrial quality control in acute ischemic kidney injury: Pum2 levels are inversely correlated with Mff protein, and Pum2 overexpression reduces ischemia-induced Mff upregulation, preserving mitochondrial homeostasis and protecting renal tubules.\",\n      \"method\": \"Western blot, overexpression in mouse model, mitochondrial respiration assay\",\n      \"journal\": \"Cell biology and toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model with overexpression and mechanistic readouts, single lab\",\n      \"pmids\": [\"31993882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PUM2 interacts with SCAMP1-TV2 lncRNA; when SCAMP1-TV2 is downregulated, PUM2 binds INSM1 mRNA, promoting its degradation.\",\n      \"method\": \"RNA immunoprecipitation (RIP), RNA pull-down, co-immunoprecipitation\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — RIP and RNA pulldown, single lab, mechanistic detail limited\",\n      \"pmids\": [\"32670859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PUM1 and PUM2 form partially distinct RNP networks in human male germ cells (TCam-2): RIP-Seq identified different target mRNA pools and mass spectrometry identified distinct protein cofactors for PUM1 and PUM2, indicating paralog-specific regulation.\",\n      \"method\": \"RIP-Seq, RNA-Seq, mass spectrometry proteomics\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — orthogonal RIP-Seq, RNA-Seq, and MS in a single study; single lab\",\n      \"pmids\": [\"32316190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PUM2 mediates packaging of miRNA-130a into exosomes in cancer-associated fibroblasts; PUM2 overexpression promotes and knockdown inhibits tumor growth in xenograft mice.\",\n      \"method\": \"Knockdown/overexpression, xenograft assay, exosome isolation and characterization\",\n      \"journal\": \"International journal of nanomedicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional knockdown/OE with xenograft, mechanism of packaging not biochemically detailed, single lab\",\n      \"pmids\": [\"33542625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PUM2 binds PRDX6 promoter (via ChIP) and represses PRDX6 expression; lncRNA Mir9-3hg binds PUM2 and downregulates it, relieving PRDX6 repression and inhibiting ferroptosis in cardiomyocytes.\",\n      \"method\": \"RNA binding protein immunoprecipitation, chromatin immunoprecipitation (ChIP)\",\n      \"journal\": \"Nutrition, metabolism, and cardiovascular diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and ChIP establishing two distinct molecular interactions, single lab\",\n      \"pmids\": [\"34953631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Pum2 directly binds and represses translation of Sox5, Bcl11b/Ctip2, and Rorβ mRNAs in developing mouse neocortex post-mitotically, shaping area-specific cytoarchitecture. Loss of Pum2 leads to expansion of subcerebral projection neurons (Sox5+Bcl11b+) at expense of layer IV neurons (Rorβ+) in somatosensory cortex, with corresponding changes in subcerebral connectivity.\",\n      \"method\": \"In utero electroporation, retrograde labeling, Pum2 KO mice (Pum2;Emx1-Cre), translational reporter assays, qRT-PCR, smFISH (negative for mRNA level change)\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo loss-of-function with connectivity tracing plus direct translational assays, replicated across multiple approaches in single study\",\n      \"pmids\": [\"35262486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PUM2 aggravates I/R-induced neuroinflammation and brain damage by suppressing SIRT1 expression, which leads to reduced SLC7A11 levels and thereby promotes ferroptosis in neurons.\",\n      \"method\": \"MCAO/R mouse model, OGD/R cell model, knockdown/rescue, western blot, RT-qPCR\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — knockdown/OE with rescue experiments but no direct RNA binding assay shown, single lab\",\n      \"pmids\": [\"35997855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PUM2 represses BTG3 expression by directly binding to the BTG3 3'UTR; PUM2 silencing inhibits proliferation and promotes apoptosis of HCC cells, effects reversed by BTG3 knockdown.\",\n      \"method\": \"Luciferase reporter assay, RNA binding protein immunoprecipitation, knockdown/rescue\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay plus functional rescue, single lab\",\n      \"pmids\": [\"36072004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PUM2 directly binds DLX5 mRNA (confirmed by RNA-IP) and represses its translation; PUM2 knockdown upregulates DLX5 and enhances osteogenic differentiation of mesenchymal stem cells.\",\n      \"method\": \"RNA-immunoprecipitation, 3'UTR reporter assay, osteogenic differentiation assays, in vivo calvarial defect model\",\n      \"journal\": \"Journal of biomedical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP plus reporter assay plus in vivo model, single lab\",\n      \"pmids\": [\"37088847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PUM2 promotes NEDD4 mRNA degradation by binding to the NEDD4 mRNA 3'UTR, leading to reduced NEDD4-mediated PTEN ubiquitination/degradation, PTEN accumulation, and ferroptosis in chondrocytes, exacerbating osteoarthritis progression.\",\n      \"method\": \"RNA immunoprecipitation, RNA pulldown, western blot, in vivo intra-articular injection model\",\n      \"journal\": \"Environmental toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and pulldown with mechanistic pathway rescue, single lab\",\n      \"pmids\": [\"38733337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PUM2 binds EFEMP1 mRNA (confirmed by immunoprecipitation) to promote EFEMP1 expression; PUM2 overexpression inhibits VSMC proliferation/migration and prevents aortic dissection in an angiotensin II mouse model.\",\n      \"method\": \"Immunoprecipitation/RNA-IP, western blot, mouse aortic dissection model\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single RNA-IP, single lab; mechanism of promoting (vs. repressing) expression not fully resolved\",\n      \"pmids\": [\"37062520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PUM2 represses SOX2 mRNA stability via interaction with SOX2 mRNA; PUM2 is upregulated in hyperglycemia-induced endothelial exosomes and delivered to trophoblasts, impairing their proliferation and invasion.\",\n      \"method\": \"High-throughput RNA-seq, exosome isolation, PUM2-mRNA interaction assay, SOX2 rescue experiment\",\n      \"journal\": \"Human & experimental toxicology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — RNA-seq and rescue experiments, limited direct binding validation described, single lab\",\n      \"pmids\": [\"36607285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SENP1 deSUMOylates PUM2 (confirmed by Ni2+-NTA pull-down and Co-IP), enhancing PUM2 stability; PUM2 then binds NRF2 mRNA 3'UTR and reduces NRF2 levels, diminishing transcription of glycolytic enzymes HK1 and GLUT1 in astrocytes under Alzheimer's disease conditions.\",\n      \"method\": \"Ni2+-NTA agarose bead pull-down, co-immunoprecipitation, RIP, luciferase reporter, APP/PS1 mouse model\",\n      \"journal\": \"Cell biology and toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical deSUMOylation assay plus RIP, single lab with multiple methods\",\n      \"pmids\": [\"39794619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PUM2 binds FOXO3 mRNA 3'UTR (confirmed by RIP, RNA pull-down, and luciferase assay) and represses FOXO3 translation, promoting IL-1β-induced chondrocyte apoptosis and ROS generation.\",\n      \"method\": \"RNA immunoprecipitation, RNA pull-down, luciferase reporter assay, overexpression/knockdown\",\n      \"journal\": \"Heliyon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — three orthogonal binding assays, single lab\",\n      \"pmids\": [\"38356524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PUM2 destabilizes HDAC9 mRNA via direct binding (confirmed by RIP and RNA pull-down); PUM2 overexpression suppresses oxidative stress and promotes autophagy in DM-CIAKI by reducing HDAC9 expression.\",\n      \"method\": \"RNA immunoprecipitation, RNA pull-down, in vivo DM-CIAKI mouse model, western blot\",\n      \"journal\": \"Diabetes & metabolism journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP plus RNA pulldown plus in vivo model, single lab\",\n      \"pmids\": [\"40930160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PUM2 directly binds SARS-CoV-2 RNA at conserved PREs; however, altering PUM2 levels does not affect progeny virion production. This is a negative mechanistic finding for antiviral function.\",\n      \"method\": \"RNA binding assay, PUM2 depletion/overexpression, viral titer measurement\",\n      \"journal\": \"The Journal of general virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA binding demonstrated plus functional virion output assay, single lab; negative result for antiviral function\",\n      \"pmids\": [\"40956600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PUM2-mediated mRNA repression requires CCR4-NOT deadenylase and depends on PABPC1 and PABPC4: PUM2 associates with PABPCs, and in their absence mRNA targets become unstable independently of PUM. Increasing PABPC levels inhibits PUM2 activity in a concentration-dependent manner by protecting poly(A) tails from deadenylation.\",\n      \"method\": \"mRNA stability assay, PUM2 association assay, PABPC depletion/overexpression, deadenylase mutant analysis\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical assays in single preprint study, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.02.680050\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CircRERE promotes UHRF1 mRNA decay by interacting with PUM2 (validated by RNA-IP and RNA pull-down); this reduces UHRF1-mediated methylation of the Drp1 promoter, increasing Drp1 expression and mitochondrial fission/dysfunction in myocardial I/R injury.\",\n      \"method\": \"RNA immunoprecipitation, RNA pull-down, ChIP assay, I/R mouse model\",\n      \"journal\": \"Chinese medical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP, RNA pulldown, and ChIP for mechanistic pathway, single lab\",\n      \"pmids\": [\"40887836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The Norad lncRNA sequesters Pum2 via Pum2-recognition sequences, reducing Pum2 binding to Mff mRNA; in neurons after OGD/R, Norad levels increase and Pum2 binding to Mff mRNA decreases, elevating Mff protein and causing mitochondrial fragmentation. Pum2 overexpression reduces Mff levels, restores mitochondrial morphology, and improves outcomes in MCAO/R mice.\",\n      \"method\": \"RIP, overexpression in OGD/R and MCAO/R models, mitochondrial morphology assay, neurobehavioral assessment\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP plus in vivo overexpression with functional readouts, single lab\",\n      \"pmids\": [\"39832611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IGF2BP2 KH1-4 domains directly bind the CPSF6-RS domain (confirmed by GST pull-down and IP/MS), recruiting CPSF6 to m6A-modified PUM2 pre-mRNA and promoting use of a proximal polyadenylation signal, generating a shorter, more stable PUM2 transcript that promotes malignant progression of ovarian cancer.\",\n      \"method\": \"RNA pull-down with biotin-labelled m6A, immunoprecipitation, mass spectrometry, GST pull-down, PAS-seq, eCLIP-seq, RIP-seq, meRIP-seq, 3'RACE, RNA stability assay, dual luciferase reporter\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biochemical and sequencing methods establishing mechanism of PUM2 mRNA regulation, single lab but very rigorous\",\n      \"pmids\": [\"40629911\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PUM2 is a conserved PUF-family RNA-binding protein that uses its C-terminal PUM homology domain to bind Pumilio-binding elements (PBEs/PREs) in the 3'UTRs of target mRNAs, repressing their translation or promoting their degradation via recruitment of CCR4-NOT deadenylase in a PABPC-dependent manner; it regulates a broad range of biological processes including mitochondrial fission/mitophagy (via Mff mRNA repression), cell cycle progression (via Cdkn1b repression), axonal mRNA exclusion, neocortical cytoarchitecture (via Sox5/Bcl11b/Rorβ translational control), and stem cell differentiation (via RUNX2/JAK2/DLX5 repression), while in mitosis it moonlights as a binding partner and activator of Aurora-A kinase at centrosomes, and is itself regulated by SUMOylation (by UBE2I) and by sequestration through lncRNAs such as Norad.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PUM2 is a conserved PUF-family sequence-specific RNA-binding protein that uses its C-terminal PUM homology domain to recognize a defined Pumilio-binding element (PBE, consensus UGUANAUA...) in target mRNA 3'UTRs with nanomolar affinity, thereby controlling translation and stability of broad regulatory programs [#0]. Cooperative occupancy of multi-PBE targets is shaped by RNA secondary structure, which redistributes conformational states to favor or impede additional PUM2 binding [#14]. Mechanistically, PUM2-mediated repression requires the CCR4-NOT deadenylase and depends on poly(A)-binding proteins PABPC1/PABPC4: PUM2 associates with PABPCs and high PABPC levels protect poly(A) tails to limit PUM2 activity [#32]. Through this 3'UTR-directed repression PUM2 governs mitochondrial fission and mitophagy by repressing Mff mRNA [#7], cell-cycle progression by repressing Cdkn1b/p27 [#8], neuronal cytoarchitecture by translationally controlling Sox5, Bcl11b, and Rorβ in developing neocortex [#21], somatodendritic exclusion of PBE-containing mRNAs from axons [#9], and stem-cell fate via repression of RUNX2, JAK2, and DLX5 [#5, #24]. Beyond repression, PUM2 can stabilize transcripts by competing with miRNAs for shared 3'UTR sites [#10, #11], and during mitosis it relocalizes from the cytoplasm to centrosomes where it binds the Aurora-A D-box, protecting Aurora-A from APC/C(Cdh1)-mediated degradation while enhancing its kinase activity [#4]. PUM2 protein levels and activity are themselves controlled by SUMOylation through UBE2I (reversed by SENP1) [#13, #28] and by sequestration through lncRNAs including Norad, which titrates PUM2 away from Mff mRNA [#34]; PUM2 transcript abundance is further set by m6A-dependent alternative polyadenylation driven by IGF2BP2/CPSF6 [#35]. PUM2 forms paralog-distinct and cofactor-specific RNP networks together with PUM1, DAZL, and BOULE, with protein partners helping determine target specificity [#1, #2, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing that human PUM2 is a bona fide sequence-specific RNA binder defined the molecular basis for all downstream target recognition.\",\n      \"evidence\": \"SELEX and recombinant protein binding assays defining the PBE consensus and nanomolar affinity\",\n      \"pmids\": [\"11780640\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify endogenous mRNA targets\", \"No structural model of the PUM-HD bound to RNA in this study\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identifying PUM2 protein partners and the first mammalian mRNA target showed that PUM2 acts within combinatorial RNP complexes whose composition tunes target specificity.\",\n      \"evidence\": \"Reciprocal Co-IP and RNA-binding assays for DAZL and BOULE, plus pull-down/RT-PCR confirming the P2P-R mRNA target\",\n      \"pmids\": [\"15607425\", \"15806553\", \"15617101\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of PUM2-DAZL/BOULE complexes on translation not quantified\", \"Single-lab Co-IP evidence for partners\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Discovery of a centrosomal, kinase-stabilizing role revealed that PUM2 has a non-canonical, RNA-independent moonlighting function in mitosis.\",\n      \"evidence\": \"Co-IP, ubiquitination and kinase activity assays, and immunofluorescence showing PUM2 binds the Aurora-A D-box and blocks APC/C(Cdh1) degradation\",\n      \"pmids\": [\"21589936\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of D-box recognition not resolved\", \"Relationship between RNA-binding and centrosomal functions unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genetic loss-of-function across species defined physiological repression programs, establishing PUM2 control of mitochondrial fission (Mff), proliferation (Cdkn1b), and axonal mRNA exclusion.\",\n      \"evidence\": \"CRISPR/Cas9 knockouts in mouse and C. elegans, gene-dosage and Cdkn1b epistasis in mice, and reporter mRNA localization with Pum2 knockdown in neurons\",\n      \"pmids\": [\"30642763\", \"30811992\", \"31606248\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct deadenylation/repression mechanism not yet biochemically dissected in these systems\", \"Tissue-specific target hierarchies incompletely mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Quantitative binding studies showed that PUM2 occupancy of multi-site targets is not independent but governed by RNA structural cooperativity.\",\n      \"evidence\": \"Equilibrium binding across a 68-RNA panel with statistical mechanical modeling\",\n      \"pmids\": [\"30914482\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RNA structural cooperativity operates on endogenous targets in cells not shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"PUM2 was shown to also act as a stabilizer by competing with miRNAs for shared 3'UTR sites, broadening its regulatory repertoire beyond repression.\",\n      \"evidence\": \"RIP/RIP-seq and luciferase assays showing PUM2 displaces miR-590-3p/miR-9 (STARD13) and miR-376a (NRP-1)\",\n      \"pmids\": [\"30084199\", \"30909144\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants of repressive versus stabilizing outcome not defined\", \"Competition shown in cancer cell lines only\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Mapping paralog-specific RNP networks distinguished PUM2 from PUM1 in target pools and protein cofactors.\",\n      \"evidence\": \"RIP-Seq, RNA-Seq, and mass-spectrometry proteomics in human germ cells\",\n      \"pmids\": [\"32316190\", \"30269240\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic basis of paralog-specific cofactor recruitment unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"PUM2 was established as a post-mitotic translational regulator that shapes neocortical area identity and connectivity.\",\n      \"evidence\": \"Pum2 KO mice, in utero electroporation, retrograde tracing, and translational reporter assays for Sox5/Bcl11b/Rorβ\",\n      \"pmids\": [\"35262486\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream control of PUM2 activity timing in cortical neurons unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defining SUMOylation/deSUMOylation control showed PUM2 abundance and activity are post-translationally gated by the SUMO machinery.\",\n      \"evidence\": \"Co-IP, Ni2+-NTA pull-down, and RIP showing UBE2I-mediated SUMOylation destabilizes PUM2 while SENP1 deSUMOylation stabilizes it\",\n      \"pmids\": [\"32997416\", \"39794619\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SUMO acceptor residues not mapped\", \"How SUMO state alters target selection unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Reconstitution of the repression machinery defined the effector mechanism: PUM2 represses via CCR4-NOT in a PABPC-dependent manner.\",\n      \"evidence\": \"mRNA stability assays, PUM2-PABPC association, PABPC depletion/overexpression, and deadenylase mutant analysis (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.10.02.680050\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Structural picture of the PUM2-CCR4-NOT-PABPC assembly absent\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"lncRNA sequestration and m6A-dependent alternative polyadenylation were shown to regulate PUM2 availability and transcript stability, adding upstream layers of control.\",\n      \"evidence\": \"RIP and in vivo models for Norad sequestration from Mff mRNA, and PAS-seq/eCLIP/RIP-seq showing IGF2BP2-CPSF6 m6A-driven proximal polyadenylation of PUM2 pre-mRNA\",\n      \"pmids\": [\"39832611\", \"40629911\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of lncRNA titration to physiological PUM2 output not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PUM2's RNA-dependent repressor function and its RNA-independent centrosomal/kinase-activating role are coordinated within a single protein remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model linking PUM-HD RNA binding to Aurora-A interaction\", \"Cell-cycle switch governing PUM2 cytoplasmic-to-centrosomal relocalization unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 14, 32]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [5, 9, 21, 29]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 32]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [8, 4]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [21, 9, 5]}\n    ],\n    \"complexes\": [\"CCR4-NOT\"],\n    \"partners\": [\"PABPC1\", \"PABPC4\", \"AURKA\", \"DAZL\", \"BOLL\", \"PUM1\", \"UBE2I\", \"SENP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}