{"gene":"CNOT7","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2004,"finding":"CNOT7 binds the AF-1 domain of retinoid X receptor beta (RXRβ) and functions as a coregulator of RXRβ in testicular somatic cells (Sertoli cells); loss of CNOT7 impairs RXRβ function and leads to oligo-astheno-teratozoospermia. Spermatogonial transplantation demonstrated the defect is in the somatic (Sertoli cell) microenvironment, not the germ cells.","method":"Co-immunoprecipitation/binding assay for AF-1 domain interaction; spermatogonial stem cell transplantation epistasis; Cnot7 knockout mouse phenotypic analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic rescue (transplantation), direct binding assay, KO phenotype with defined cellular mechanism, replicated in companion histology paper","pmids":["15107851","15700538"],"is_preprint":false},{"year":2004,"finding":"Wild-type germ cells transplanted into Cnot7−/− testes develop abnormal spermatids, confirming that Sertoli cell defects (not germ cell-intrinsic defects) are responsible for the spermatogenic failure in Cnot7-null mice.","method":"Reciprocal spermatogonial transplantation assay","journal":"Archives of histology and cytology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis via reciprocal transplantation, directly establishes cell-autonomous somatic cell requirement","pmids":["15700538"],"is_preprint":false},{"year":2007,"finding":"CNOT7 acts as an endogenous suppressor of bone mass by inhibiting BMP-induced osteoblast activity; Cnot7−/− mice show >50% increase in bone mass with enhanced bone formation but no change in resorption, and Cnot7−/− osteoblasts exhibit heightened BMP-induced alkaline phosphatase expression. CNOT7 binds TOB, a BMP inhibitor, placing it in the BMP signaling pathway in osteoblasts.","method":"Cnot7 knockout mouse histomorphometry, microCT, in vitro BMP stimulation of calvaria-derived osteoblasts, in vivo BMP2 injection assay, TOB interaction (binding data from prior work cited)","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (microCT, histomorphometry, cell culture, in vivo BMP assay) in KO model with clear cellular phenotype","pmids":["17451368"],"is_preprint":false},{"year":2009,"finding":"Human CNOT7 (hCaf1/Caf1a) and its paralog CNOT8 possess deadenylase activity mediated by DEDD nuclease domains and are required for efficient cell proliferation; CNOT7's role in proliferation partly depends on its catalytic activity. Combined knockdown of CNOT7 and CNOT8 further reduces proliferation, indicating partial functional redundancy.","method":"siRNA knockdown of CNOT7 and/or CNOT8 in MCF7 cells; cell proliferation assays; gene expression profiling; catalytic mutant analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — catalytic mutant used to separate enzymatic from non-enzymatic roles, double KD epistasis, multiple readouts in single lab","pmids":["19605561"],"is_preprint":false},{"year":2012,"finding":"The anti-proliferative activity of BTG/TOB proteins (BTG2, TOB1) requires direct interaction with CNOT7 (Caf1a) and CNOT8 (Caf1b) deadenylases; BTG/TOB mutants unable to bind Caf1a/Caf1b lose anti-proliferative activity. BTG/TOB regulation of mRNA abundance and translation also depends on Caf1a/Caf1b, and does not require the Ccr4a/Ccr4b deadenylases or non-catalytic subunits CNOT1/CNOT3.","method":"Structure-guided mutagenesis of BTG2/TOB1 interaction surfaces; cell proliferation assays with interaction-deficient mutants; mRNA abundance and translation assays","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis of interaction interface combined with functional proliferation and mRNA assays, clearly defines required binding partner relationship","pmids":["23236473"],"is_preprint":false},{"year":2013,"finding":"CNOT7/hCAF1 regulates interferon (IFN) signaling by: (1) interacting with latent STAT1 in the cytoplasm of resting cells to control STAT1 trafficking/shielding from undesirable stimulation; (2) upon IFN treatment, STAT1 is released from hCAF1; (3) hCAF1 silencing enhances basal STAT1 promoter occupancy and expression of STAT1-regulated genes, conferring increased antiviral protection; (4) hCAF1 uses its deadenylase activity to accelerate degradation of STAT1-regulated mRNAs during IFN signal extinction.","method":"Co-immunoprecipitation (hCAF1–STAT1 interaction); hCAF1 siRNA knockdown; reporter/promoter occupancy assays; viral infection protection assays; deadenylase activity assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP for STAT1 interaction, KD with multiple functional readouts (gene expression, antiviral protection), deadenylase activity mechanistically linked","pmids":["23386060"],"is_preprint":false},{"year":2014,"finding":"CNOT7/hCAF1, tristetraprolin (TTP), and CNOT1 form a co-immunoprecipitable complex; CNOT7 silencing stabilizes ICAM-1 and IL-8 mRNAs and increases their protein levels after TNF-α stimulation, establishing CNOT7 as the deadenylase effector downstream of TTP-ARE-mediated mRNA decay for these inflammatory targets.","method":"Co-immunoprecipitation (TTP–CNOT7–CNOT1 complex); RIP (TTP bound to ICAM-1 and IL-8 mRNAs); siRNA knockdown of CNOT7; mRNA stability and protein quantification","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP of trimeric complex, RIP, and KD with mRNA stability readout, single lab","pmids":["25038453"],"is_preprint":false},{"year":2015,"finding":"CNOT7 is encoded by a dormant maternal mRNA in mouse oocytes that is recruited (translated) during meiotic maturation; the resulting increase in CNOT7 protein is necessary and sufficient to drive deadenylation of maternal mRNAs. Inhibiting the maturation-associated increase in CNOT7 via siRNA blocks mRNA deadenylation, whereas premature expression of CNOT7 in pre-maturation oocytes initiates deadenylation. Loss of the CNOT7 increase also causes ~70% decrease in transcription in 2-cell embryos.","method":"siRNA knockdown of CNOT7 during oocyte maturation; ectopic CNOT7 expression in meiotically arrested oocytes; poly(A) tail length assays; quantification of total poly(A); transcription assay in 2-cell embryos","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function and gain-of-function both tested with direct poly(A) readout, multiple orthogonal assays in single focused study","pmids":["26134871"],"is_preprint":false},{"year":2016,"finding":"CNOT7 drives tumor cell-autonomous metastatic potential in a manner requiring its deadenylase activity and its interactions with CNOT1 and TOB1. CNOT7 RIP identified target transcripts enriched for a tripartite 3'UTR motif bound by RNA-binding proteins known to complex with CNOT7/TOB1/CNOT1, supporting a model of post-transcriptional suppression of a metastasis-suppressive transcriptional program.","method":"Orthotopic metastasis assays; genetically engineered mouse models; deadenylase-dead mutant rescue; co-immunoprecipitation for CNOT1 and TOB1 interactions; RIP-seq; transcriptome analysis","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo metastasis model, catalytic mutant, protein interaction mapping, RIP-seq, multiple orthogonal methods","pmids":["26807845"],"is_preprint":false},{"year":2017,"finding":"CNOT7 dynamically regulates dendritic mRNA poly(A) tail length and transport in hippocampal neurons; synaptic stimulation causes a rapid decrease in CNOT7, leading to transient poly(A) elongation of target mRNAs, followed by later deadenylation. CNOT7 is required for hippocampal-dependent learning and memory in mice.","method":"Live imaging and fractionation of CNOT7 in cultured hippocampal neurons; poly(A) tail length assays after synaptic stimulation; CNOT7 knockdown; in vivo behavioral/cognitive testing in mice","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct poly(A) assays, localization/level dynamics, KD phenotype, in vivo behavioral validation, multiple orthogonal approaches in single study","pmids":["28723570"],"is_preprint":false},{"year":2017,"finding":"Alternative splicing of the CNOT7 gene produces a shorter isoform (CNOT7v2) that: (1) interacts with CCR4-NOT subunits but not BTG proteins; (2) localizes to the nucleus rather than cytoplasm; (3) lacks poly(A)-degrading activity in vitro despite conserved DEDD domain; (4) preferentially associates with PRMT1 to regulate its arginine methyltransferase activity; and (5) regulates inclusion of CD44 variable exons (alternative splicing).","method":"Biochemical characterization of splice variant; subcellular fractionation/localization; in vitro deadenylase assay; co-immunoprecipitation with PRMT1; alternative splicing reporter assays in cellulo","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro nuclease assay (negative result for v2), Co-IP with PRMT1, localization, splicing assay, multiple orthogonal methods in single lab","pmids":["28591869"],"is_preprint":false},{"year":2017,"finding":"In zebrafish, Cnot7-mediated deadenylation and Dcp2-mediated decapping make pervasive but nonuniform contributions to maternal mRNA clearance during maternal-to-zygotic transition; individual mRNAs differ in their relative dependency on each pathway.","method":"Overexpression of catalytically inactive Dcp2; RNA-seq to measure mRNA levels; comparison with Cnot7-depleted embryos","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq with catalytic mutant and comparative analysis, single lab, establishes pathway position for Cnot7 in mRNA clearance","pmids":["28557307"],"is_preprint":false},{"year":2020,"finding":"CNOT7 and CNOT8 together are essential for cell viability in primary mouse embryonic fibroblasts (MEFs): Cnot7/8 double-KO MEFs undergo cell death, whereas Cnot6/6l double-KO MEFs remain viable. Exogenous catalytically dead CNOT7 cannot rescue viability, establishing that CNOT7/8 deadenylase activity is essential. In Cnot7/8-dKO MEFs, CNOT6/6L are also absent from the CCR4-NOT complex (detected by Co-IP), but CNOT6/6L alone are insufficient for cell viability.","method":"Double-knockout MEFs (Cnot7/8 and Cnot6/6l); catalytic mutant rescue experiment; co-immunoprecipitation to assess complex assembly; bulk poly(A) tail analysis; mRNA stability profiling","journal":"RNA biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — catalytic mutant, KO genetics with viability readout, complex assembly by Co-IP, poly(A) tail analysis, multiple orthogonal methods","pmids":["31924127"],"is_preprint":false},{"year":2022,"finding":"CNOT7 outcompetes its paralog CNOT8 for incorporation into the CCR4-NOT complex: CNOT7 has greater affinity for the scaffold protein CNOT1 and can block CNOT8 from binding CNOT1. Depletion of CNOT7 increases CNOT8 incorporation into the CCR4-NOT complex and stabilizes CNOT8 protein. CNOT8 protein is less stable than CNOT7, and its increased abundance upon CNOT7 depletion is not due to mRNA stabilization or increased translation.","method":"Co-immunoprecipitation (CNOT7/CNOT8 competition for CNOT1); siRNA knockdown; protein stability assays; mRNA quantification; polysome/translation analysis","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP competition assay, KD, protein and mRNA stability measurements, multiple orthogonal methods in single lab","pmids":["35248544"],"is_preprint":false},{"year":2024,"finding":"Small-molecule inhibitors of the CNOT7/Caf1 nuclease active site were identified; molecular docking suggests binding involves π-π interactions with His225, hydrogen bonding with the backbone of Phe43, and Van der Waals interactions with His225, Leu209, Leu112, and Leu115. Substituents on the 1-phenyl group of the inhibitor scaffold contribute significantly to binding potency.","method":"Fluorescence-based nuclease assay (biochemical IC50 determination); structure–activity relationship analysis of 16 analogues; molecular docking to active site","journal":"Molecules","confidence":"Medium","confidence_rationale":"Tier 1-3 / Moderate — in vitro enzymatic assay with SAR, docking (computational), single lab, no crystal structure validation","pmids":["39339346"],"is_preprint":false},{"year":2025,"finding":"CNOT7 promotes radiation resistance in colorectal cancer by stabilizing XRCC6 protein: CNOT7 interacts with XRCC6 and inhibits TRIM21-mediated K48-linked ubiquitination at lysine 526 of XRCC6, preventing its proteasomal degradation and facilitating NHEJ-mediated DNA double-strand break repair. Additionally, CNOT7 uses its deadenylase activity to accelerate TRIM21 mRNA degradation, reducing TRIM21 levels.","method":"Co-immunoprecipitation (CNOT7–XRCC6 interaction); ubiquitination assay (K48-linkage at K526); CNOT7 KD in vitro and in vivo (xenograft); mRNA stability assay for TRIM21; DSB repair assays; PDX tumor models","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination site mapping, KD with functional readout, mRNA stability assay, in vivo models, multiple orthogonal methods single lab","pmids":["41249119"],"is_preprint":false},{"year":2025,"finding":"High-throughput screening of 10,880 compounds identified 15 small-molecule inhibitors of CNOT7/Caf1 poly(A)-selective nuclease activity with IC50 values below 25 μM, providing chemical tools to differentiate catalytic from non-catalytic roles of CNOT7.","method":"Fluorescence-based biochemical nuclease assay screen; molecular docking for binding mode prediction","journal":"Biomolecules","confidence":"Low","confidence_rationale":"Tier 3 / Weak — biochemical screen with docking, no structural validation or cellular mechanistic follow-up reported","pmids":["41301481"],"is_preprint":false}],"current_model":"CNOT7 (hCAF1/Caf1a) is a DEDD-domain deadenylase and catalytic subunit of the CCR4-NOT complex that removes poly(A) tails from mRNAs to promote their decay; it is the dominant Caf1 paralog, outcompeting CNOT8 for binding to the scaffold protein CNOT1, and its deadenylase activity is essential for cell viability, mRNA turnover during oocyte maturation and maternal-to-zygotic transition, regulation of synaptic plasticity and cognition, innate immune signaling (via cytoplasmic sequestration of STAT1 and deadenylation of IFN-regulated mRNAs), spermatogenesis (as a coregulator of RXRβ in Sertoli cells), bone mass suppression (by antagonizing BMP signaling via interaction with TOB), anti-proliferative signaling (by serving as the effector for BTG/TOB proteins), and DNA repair–mediated radiation resistance (by stabilizing XRCC6 and deadenylating TRIM21 mRNA); an alternatively spliced nuclear isoform (CNOT7v2) lacks deadenylase activity but associates with PRMT1 to regulate arginine methylation and alternative splicing."},"narrative":{"mechanistic_narrative":"CNOT7 (hCAF1/Caf1a) is a DEDD-domain deadenylase and a catalytic subunit of the CCR4-NOT complex that removes mRNA poly(A) tails to control message stability and translation across diverse physiological programs [PMID:19605561, PMID:31924127]. It outcompetes its paralog CNOT8 for the scaffold subunit CNOT1, and CNOT7/CNOT8 deadenylase activity—not the CNOT6/6L deadenylases—is essential for cell viability, since catalytically dead CNOT7 fails to rescue death of Cnot7/8 double-knockout fibroblasts [PMID:31924127, PMID:35248544]. CNOT7 serves as the obligate deadenylase effector for the anti-proliferative BTG/TOB proteins, whose suppressive activity requires direct binding to CNOT7 [PMID:23236473], and this CNOT7–TOB1–CNOT1 axis drives post-transcriptional silencing of a metastasis-suppressive program in tumor cells [PMID:26807845]. Its catalytic activity executes regulated mRNA turnover in specialized contexts: deadenylation of maternal mRNAs during oocyte meiotic maturation and the maternal-to-zygotic transition [PMID:26134871, PMID:28557307], dynamic poly(A) tail control of dendritic mRNAs underlying learning and memory [PMID:28723570], and TTP-directed decay of inflammatory ARE-containing transcripts such as ICAM-1 and IL-8 [PMID:25038453]. In innate immunity CNOT7 sequesters latent STAT1 in the cytoplasm and deadenylates STAT1-regulated mRNAs to extinguish interferon signaling [PMID:23386060]. CNOT7 also functions outside RNA decay: it binds the AF-1 domain of RXRβ as a Sertoli-cell coregulator required for spermatogenesis [PMID:15107851, PMID:15700538], antagonizes BMP-induced osteoblast activity via TOB to suppress bone mass [PMID:17451368], and promotes radiation resistance by stabilizing XRCC6 against TRIM21-mediated K48 ubiquitination while deadenylating TRIM21 mRNA [PMID:41249119]. An alternatively spliced nuclear isoform, CNOT7v2, lacks deadenylase activity, does not bind BTG proteins, and instead associates with PRMT1 to regulate arginine methylation and alternative splicing [PMID:28591869]. Small-molecule active-site inhibitors of CNOT7 have been developed as tools to separate its catalytic from non-catalytic roles [PMID:39339346].","teleology":[{"year":2004,"claim":"Established the first physiological role for CNOT7 by showing it acts as an RXRβ coregulator in the somatic compartment of the testis, defining a cell-non-autonomous requirement for spermatogenesis.","evidence":"AF-1 domain binding assay, Cnot7 knockout phenotyping, and reciprocal spermatogonial transplantation in mice","pmids":["15107851","15700538"],"confidence":"High","gaps":["Did not connect the RXRβ coregulator role to deadenylase activity","Molecular targets downstream of RXRβ/CNOT7 in Sertoli cells not identified"]},{"year":2007,"claim":"Identified CNOT7 as an endogenous suppressor of bone mass that antagonizes BMP-induced osteoblast activity through its interaction with the BMP inhibitor TOB, placing it within BMP signaling.","evidence":"Cnot7 knockout microCT/histomorphometry, in vitro and in vivo BMP stimulation of osteoblasts","pmids":["17451368"],"confidence":"High","gaps":["Whether bone suppression requires deadenylase activity not tested","Direct mRNA targets in osteoblasts not defined"]},{"year":2009,"claim":"Defined CNOT7 as a DEDD-domain deadenylase required for cell proliferation, partly through its catalytic activity, with partial redundancy with CNOT8.","evidence":"siRNA knockdown of CNOT7/CNOT8 in MCF7 cells with catalytic mutant analysis and expression profiling","pmids":["19605561"],"confidence":"High","gaps":["Catalytic vs non-catalytic contributions only partially separated","Specific proliferation-relevant target mRNAs not pinpointed"]},{"year":2012,"claim":"Showed BTG/TOB anti-proliferative proteins exert their effect specifically through CNOT7/CNOT8, establishing CNOT7 as the deadenylase effector of BTG/TOB and excluding CCR4 paralogs.","evidence":"Structure-guided mutagenesis of BTG2/TOB1 interaction surfaces with proliferation and mRNA/translation assays","pmids":["23236473"],"confidence":"High","gaps":["mRNA targets selectively regulated by the BTG/TOB-CNOT7 axis not enumerated"]},{"year":2013,"claim":"Revealed a dual role for CNOT7 in interferon signaling—cytoplasmic sequestration of latent STAT1 and deadenylation of STAT1-regulated mRNAs—coupling protein trafficking control to mRNA decay during signal extinction.","evidence":"Reciprocal Co-IP for hCAF1-STAT1, siRNA knockdown, promoter occupancy and antiviral protection assays, deadenylase assay","pmids":["23386060"],"confidence":"High","gaps":["Structural basis of STAT1 shielding unknown","How IFN triggers STAT1 release from hCAF1 not mechanistically resolved"]},{"year":2014,"claim":"Positioned CNOT7 as the deadenylase effector downstream of TTP in ARE-mediated decay of inflammatory mRNAs, linking it to TNF-α-responsive gene regulation.","evidence":"Co-IP of TTP-CNOT7-CNOT1 complex, RIP, siRNA knockdown with mRNA stability and protein readouts","pmids":["25038453"],"confidence":"Medium","gaps":["Single-lab Co-IP without reciprocal validation across systems","Breadth of TTP-dependent targets requiring CNOT7 not defined"]},{"year":2015,"claim":"Demonstrated that translational up-regulation of CNOT7 from a dormant maternal mRNA is necessary and sufficient to trigger maternal mRNA deadenylation during oocyte maturation, defining CNOT7 abundance as the rate-limiting switch.","evidence":"siRNA knockdown and ectopic expression in mouse oocytes with poly(A) tail and transcription assays","pmids":["26134871"],"confidence":"High","gaps":["Mechanism coupling CNOT7 loss to reduced 2-cell transcription unclear","Specificity for particular maternal transcripts not mapped"]},{"year":2016,"claim":"Connected CNOT7 deadenylase activity and its CNOT1/TOB1 interactions to tumor-cell-autonomous metastatic potential via post-transcriptional suppression of a metastasis-suppressive program.","evidence":"Orthotopic metastasis and GEMM assays, catalytic-dead rescue, Co-IP, RIP-seq, transcriptome analysis","pmids":["26807845"],"confidence":"High","gaps":["Identity of individual metastasis-suppressive effector transcripts not fully resolved","RNA-binding proteins reading the tripartite 3'UTR motif not all defined"]},{"year":2017,"claim":"Showed CNOT7 dynamically tunes dendritic mRNA poly(A) tail length in response to synaptic stimulation and is required for hippocampal learning and memory, extending its deadenylase role to neuronal plasticity.","evidence":"Live imaging, fractionation and poly(A) assays in hippocampal neurons, knockdown, in vivo behavioral testing","pmids":["28723570"],"confidence":"High","gaps":["Signaling that drives rapid CNOT7 loss after stimulation unknown","Specific synaptic mRNA targets not comprehensively identified"]},{"year":2017,"claim":"Characterized a nuclear, catalytically inactive splice isoform (CNOT7v2) that associates with PRMT1 and regulates arginine methylation and alternative splicing, revealing a deadenylase-independent function.","evidence":"Splice-variant biochemistry, fractionation, in vitro deadenylase assay, PRMT1 Co-IP, splicing reporter assays","pmids":["28591869"],"confidence":"High","gaps":["In vivo significance of CNOT7v2 not established","How v2 modulates PRMT1 activity mechanistically unclear"]},{"year":2017,"claim":"Placed Cnot7-mediated deadenylation alongside Dcp2 decapping as pervasive but non-uniform contributors to maternal mRNA clearance during the maternal-to-zygotic transition.","evidence":"RNA-seq comparison of Cnot7-depleted and catalytically inactive Dcp2 zebrafish embryos","pmids":["28557307"],"confidence":"Medium","gaps":["Determinants of transcript-specific pathway preference not defined","Single-organism, single-lab analysis"]},{"year":2020,"claim":"Established that CNOT7/CNOT8 deadenylase activity is essential for cell viability and that CNOT6/6L cannot substitute, formally ranking the two deadenylase pairs within the CCR4-NOT complex.","evidence":"Cnot7/8 and Cnot6/6l double-knockout MEFs with catalytic-dead rescue, Co-IP, poly(A) and mRNA stability profiling","pmids":["31924127"],"confidence":"High","gaps":["Essential target mRNAs whose dysregulation causes death not identified"]},{"year":2022,"claim":"Explained CNOT7 dominance over CNOT8 by showing it has higher affinity for the CNOT1 scaffold and blocks CNOT8 incorporation, with CNOT8 stabilized only when CNOT7 is depleted.","evidence":"Reciprocal Co-IP competition, knockdown, protein and mRNA stability and translation assays","pmids":["35248544"],"confidence":"High","gaps":["Structural basis of differential CNOT1 affinity not resolved","Functional consequence of CNOT8 substitution on target repertoire unclear"]},{"year":2025,"claim":"Defined a non-canonical role in DNA repair whereby CNOT7 stabilizes XRCC6 by blocking TRIM21-mediated K48 ubiquitination and deadenylates TRIM21 mRNA, promoting NHEJ and radiation resistance in colorectal cancer.","evidence":"Co-IP, ubiquitination site mapping at K526, knockdown in vitro and in xenograft/PDX models, TRIM21 mRNA stability and DSB repair assays","pmids":["41249119"],"confidence":"High","gaps":["How CNOT7 sterically or enzymatically blocks TRIM21 ubiquitination unclear","Generality beyond colorectal cancer untested"]},{"year":2024,"claim":"Provided first chemical inhibitors of the CNOT7 nuclease active site with a defined predicted binding mode, enabling pharmacological dissection of catalytic function.","evidence":"Fluorescence nuclease IC50 assay, SAR of 16 analogues, molecular docking","pmids":["39339346"],"confidence":"Medium","gaps":["No crystal structure confirming docked binding mode","Cellular potency and selectivity not demonstrated"]},{"year":2025,"claim":"Expanded the inhibitor toolkit through high-throughput screening, yielding multiple sub-25 μM CNOT7 nuclease inhibitors to differentiate catalytic from non-catalytic roles.","evidence":"Fluorescence biochemical nuclease screen of 10,880 compounds with docking","pmids":["41301481"],"confidence":"Low","gaps":["No structural validation or cellular mechanistic follow-up","Selectivity over CNOT8/CNOT6 not established"]},{"year":null,"claim":"How CNOT7 substrate selectivity, recruitment by distinct RNA-binding adaptors, and its catalytic versus scaffolding/protein-stabilizing functions are coordinated across its many physiological contexts remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying determinant of context-specific target choice identified","Structural basis for adaptor (BTG/TOB, TTP, STAT1, XRCC6) discrimination unknown","Relative in vivo importance of catalytic vs non-catalytic roles not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[3,7,9,12]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[8]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[3,12]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,5]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,9,10]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[3,7,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,7]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,15]}],"complexes":["CCR4-NOT"],"partners":["CNOT1","CNOT8","TOB1","BTG2","STAT1","PRMT1","XRCC6","RXRB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UIV1","full_name":"CCR4-NOT transcription complex subunit 7","aliases":["BTG1-binding factor 1","CCR4-associated factor 1","CAF-1","Caf1a"],"length_aa":285,"mass_kda":32.7,"function":"Has 3'-5' poly(A) exoribonuclease activity for synthetic poly(A) RNA substrate (PubMed:19276069, PubMed:20634287, PubMed:31439799). Its function seems to be partially redundant with that of CNOT8 (PubMed:19605561). Catalytic component of the CCR4-NOT complex which is one of the major cellular mRNA deadenylases and is linked to various cellular processes including bulk mRNA degradation, miRNA-mediated repression, translational repression during translational initiation and general transcription regulation (PubMed:19276069, PubMed:20634287, PubMed:31439799). During miRNA-mediated repression the complex also seems to act as translational repressor during translational initiation (PubMed:20065043). Additional complex functions may be a consequence of its influence on mRNA expression (PubMed:19276069, PubMed:23236473). Associates with members of the BTG family such as TOB1 and BTG2 and is required for their anti-proliferative activity (PubMed:19276069, PubMed:23236473)","subcellular_location":"Nucleus; Cytoplasm, P-body; Cytoplasm, Cytoplasmic ribonucleoprotein granule","url":"https://www.uniprot.org/uniprotkb/Q9UIV1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CNOT7","classification":"Not Classified","n_dependent_lines":185,"n_total_lines":1208,"dependency_fraction":0.15314569536423842},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CNOT7","total_profiled":1310},"omim":[{"mim_id":"620508","title":"CCR4-NOT TRANSCRIPTION COMPLEX, SUBUNIT 10; CNOT10","url":"https://www.omim.org/entry/620508"},{"mim_id":"619009","title":"OOCYTE/ZYGOTE/EMBRYO MATURATION ARREST 8; OZEMA8","url":"https://www.omim.org/entry/619009"},{"mim_id":"605673","title":"B-CELL ANTIPROLIFERATION FACTOR 4; BTG4","url":"https://www.omim.org/entry/605673"},{"mim_id":"604917","title":"CCR4-NOT TRANSCRIPTION COMPLEX, SUBUNIT 1; CNOT1","url":"https://www.omim.org/entry/604917"},{"mim_id":"604913","title":"CCR4-NOT TRANSCRIPTION COMPLEX, SUBUNIT 7; CNOT7","url":"https://www.omim.org/entry/604913"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nuclear bodies","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CNOT7"},"hgnc":{"alias_symbol":[],"prev_symbol":["CAF1"]},"alphafold":{"accession":"Q9UIV1","domains":[{"cath_id":"3.30.420.10","chopping":"10-283","consensus_level":"high","plddt":92.7054,"start":10,"end":283}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UIV1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UIV1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UIV1-F1-predicted_aligned_error_v6.png","plddt_mean":90.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CNOT7","jax_strain_url":"https://www.jax.org/strain/search?query=CNOT7"},"sequence":{"accession":"Q9UIV1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UIV1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UIV1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UIV1"}},"corpus_meta":[{"pmid":"15107851","id":"PMC_15107851","title":"Oligo-astheno-teratozoospermia in mice lacking Cnot7, a regulator of retinoid X receptor beta.","date":"2004","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/15107851","citation_count":108,"is_preprint":false},{"pmid":"19605561","id":"PMC_19605561","title":"The Ccr4-NOT deadenylase subunits CNOT7 and CNOT8 have overlapping roles and modulate cell proliferation.","date":"2009","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/19605561","citation_count":97,"is_preprint":false},{"pmid":"23236473","id":"PMC_23236473","title":"The anti-proliferative activity of BTG/TOB proteins is mediated via the Caf1a (CNOT7) and Caf1b (CNOT8) deadenylase subunits of the Ccr4-not complex.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23236473","citation_count":64,"is_preprint":false},{"pmid":"26134871","id":"PMC_26134871","title":"Mobilization of Dormant Cnot7 mRNA Promotes Deadenylation of Maternal Transcripts During Mouse Oocyte 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(CNOT7).","date":"2022","source":"Bioengineered","url":"https://pubmed.ncbi.nlm.nih.gov/35156522","citation_count":28,"is_preprint":false},{"pmid":"23386060","id":"PMC_23386060","title":"hCAF1/CNOT7 regulates interferon signalling by targeting STAT1.","date":"2013","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/23386060","citation_count":28,"is_preprint":false},{"pmid":"17451368","id":"PMC_17451368","title":"Cnot7-null mice exhibit high bone mass phenotype and modulation of BMP actions.","date":"2007","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/17451368","citation_count":27,"is_preprint":false},{"pmid":"33256566","id":"PMC_33256566","title":"MicroRNA-126-5p Inhibits the Migration of Breast Cancer Cells by Directly Targeting CNOT7.","date":"2020","source":"Technology in cancer research & treatment","url":"https://pubmed.ncbi.nlm.nih.gov/33256566","citation_count":19,"is_preprint":false},{"pmid":"15700538","id":"PMC_15700538","title":"Abnormal sperm morphology caused by defects in Sertoli cells of Cnot7 knockout mice.","date":"2004","source":"Archives of histology and cytology","url":"https://pubmed.ncbi.nlm.nih.gov/15700538","citation_count":17,"is_preprint":false},{"pmid":"28723570","id":"PMC_28723570","title":"Dynamic Control of Dendritic mRNA Expression by CNOT7 Regulates Synaptic Efficacy and Higher Cognitive Function.","date":"2017","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/28723570","citation_count":15,"is_preprint":false},{"pmid":"25038453","id":"PMC_25038453","title":"CNOT7/hCAF1 is involved in ICAM-1 and IL-8 regulation by tristetraprolin.","date":"2014","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/25038453","citation_count":14,"is_preprint":false},{"pmid":"12845644","id":"PMC_12845644","title":"Analysis of the transcription regulator, CNOT7, as a candidate chromosome 8 tumor suppressor gene in colorectal cancer.","date":"2003","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/12845644","citation_count":12,"is_preprint":false},{"pmid":"28591869","id":"PMC_28591869","title":"Alternative splicing of CNOT7 diversifies CCR4-NOT functions.","date":"2017","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/28591869","citation_count":11,"is_preprint":false},{"pmid":"35248544","id":"PMC_35248544","title":"CNOT7 Outcompetes Its Paralog CNOT8 for Integration into The CCR4-NOT Complex.","date":"2022","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/35248544","citation_count":10,"is_preprint":false},{"pmid":"33412213","id":"PMC_33412213","title":"CNOT7 modulates biological functions of ovarian cancer cells via AKT signaling pathway.","date":"2021","source":"Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33412213","citation_count":10,"is_preprint":false},{"pmid":"32160402","id":"PMC_32160402","title":"CNOT7 depletion reverses natural killer cell resistance by modulating the tumor immune microenvironment of hepatocellular carcinoma.","date":"2020","source":"FEBS open bio","url":"https://pubmed.ncbi.nlm.nih.gov/32160402","citation_count":10,"is_preprint":false},{"pmid":"28557307","id":"PMC_28557307","title":"Pervasive yet nonuniform contributions of Dcp2 and Cnot7 to maternal mRNA clearance in zebrafish.","date":"2017","source":"Genes to cells : devoted to molecular & cellular mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/28557307","citation_count":9,"is_preprint":false},{"pmid":"36797658","id":"PMC_36797658","title":"CCR4-NOT subunit CCF-1/CNOT7 promotes transcriptional activation to multiple stress responses in Caenorhabditis elegans.","date":"2023","source":"Aging cell","url":"https://pubmed.ncbi.nlm.nih.gov/36797658","citation_count":8,"is_preprint":false},{"pmid":"16639713","id":"PMC_16639713","title":"Expression analysis of LacZ gene placed in the locus of Cnot7 exhibits its activity in osteoblasts in vivo and in mineralized nodules in vitro.","date":"2006","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16639713","citation_count":5,"is_preprint":false},{"pmid":"38772212","id":"PMC_38772212","title":"CNOT7 regulates lipid deposition in nonalcoholic fatty liver disease.","date":"2024","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/38772212","citation_count":2,"is_preprint":false},{"pmid":"40806280","id":"PMC_40806280","title":"CCR4-NOT Transcription Complex Subunit 7 (CNOT7) Protein and Leukocyte-Associated Immunoglobulin-like Receptor-1 in Breast Cancer Progression: Clinical Mechanistic Insights and In Silico Therapeutic Potential.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/40806280","citation_count":1,"is_preprint":false},{"pmid":"39339346","id":"PMC_39339346","title":"Discovery of Substituted 5-(2-Hydroxybenzoyl)-2-Pyridone Analogues as Inhibitors of the Human Caf1/CNOT7 Ribonuclease.","date":"2024","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/39339346","citation_count":1,"is_preprint":false},{"pmid":"41249119","id":"PMC_41249119","title":"CNOT7 facilitates radiation resistance in colorectal cancer through TRIM21/XRCC6-mediated non-homologous end joining repair.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41249119","citation_count":0,"is_preprint":false},{"pmid":"41301481","id":"PMC_41301481","title":"Discovery of Drug-like Inhibitors of the Human Caf1/CNOT7 poly(A)-Selective Nuclease Using Compound Screening.","date":"2025","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/41301481","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":15471,"output_tokens":5022,"usd":0.060872,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13312,"output_tokens":5450,"usd":0.101405,"stage2_stop_reason":"end_turn"},"total_usd":0.162277,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"CNOT7 binds the AF-1 domain of retinoid X receptor beta (RXRβ) and functions as a coregulator of RXRβ in testicular somatic cells (Sertoli cells); loss of CNOT7 impairs RXRβ function and leads to oligo-astheno-teratozoospermia. Spermatogonial transplantation demonstrated the defect is in the somatic (Sertoli cell) microenvironment, not the germ cells.\",\n      \"method\": \"Co-immunoprecipitation/binding assay for AF-1 domain interaction; spermatogonial stem cell transplantation epistasis; Cnot7 knockout mouse phenotypic analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic rescue (transplantation), direct binding assay, KO phenotype with defined cellular mechanism, replicated in companion histology paper\",\n      \"pmids\": [\"15107851\", \"15700538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Wild-type germ cells transplanted into Cnot7−/− testes develop abnormal spermatids, confirming that Sertoli cell defects (not germ cell-intrinsic defects) are responsible for the spermatogenic failure in Cnot7-null mice.\",\n      \"method\": \"Reciprocal spermatogonial transplantation assay\",\n      \"journal\": \"Archives of histology and cytology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis via reciprocal transplantation, directly establishes cell-autonomous somatic cell requirement\",\n      \"pmids\": [\"15700538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CNOT7 acts as an endogenous suppressor of bone mass by inhibiting BMP-induced osteoblast activity; Cnot7−/− mice show >50% increase in bone mass with enhanced bone formation but no change in resorption, and Cnot7−/− osteoblasts exhibit heightened BMP-induced alkaline phosphatase expression. CNOT7 binds TOB, a BMP inhibitor, placing it in the BMP signaling pathway in osteoblasts.\",\n      \"method\": \"Cnot7 knockout mouse histomorphometry, microCT, in vitro BMP stimulation of calvaria-derived osteoblasts, in vivo BMP2 injection assay, TOB interaction (binding data from prior work cited)\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (microCT, histomorphometry, cell culture, in vivo BMP assay) in KO model with clear cellular phenotype\",\n      \"pmids\": [\"17451368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human CNOT7 (hCaf1/Caf1a) and its paralog CNOT8 possess deadenylase activity mediated by DEDD nuclease domains and are required for efficient cell proliferation; CNOT7's role in proliferation partly depends on its catalytic activity. Combined knockdown of CNOT7 and CNOT8 further reduces proliferation, indicating partial functional redundancy.\",\n      \"method\": \"siRNA knockdown of CNOT7 and/or CNOT8 in MCF7 cells; cell proliferation assays; gene expression profiling; catalytic mutant analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — catalytic mutant used to separate enzymatic from non-enzymatic roles, double KD epistasis, multiple readouts in single lab\",\n      \"pmids\": [\"19605561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The anti-proliferative activity of BTG/TOB proteins (BTG2, TOB1) requires direct interaction with CNOT7 (Caf1a) and CNOT8 (Caf1b) deadenylases; BTG/TOB mutants unable to bind Caf1a/Caf1b lose anti-proliferative activity. BTG/TOB regulation of mRNA abundance and translation also depends on Caf1a/Caf1b, and does not require the Ccr4a/Ccr4b deadenylases or non-catalytic subunits CNOT1/CNOT3.\",\n      \"method\": \"Structure-guided mutagenesis of BTG2/TOB1 interaction surfaces; cell proliferation assays with interaction-deficient mutants; mRNA abundance and translation assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis of interaction interface combined with functional proliferation and mRNA assays, clearly defines required binding partner relationship\",\n      \"pmids\": [\"23236473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CNOT7/hCAF1 regulates interferon (IFN) signaling by: (1) interacting with latent STAT1 in the cytoplasm of resting cells to control STAT1 trafficking/shielding from undesirable stimulation; (2) upon IFN treatment, STAT1 is released from hCAF1; (3) hCAF1 silencing enhances basal STAT1 promoter occupancy and expression of STAT1-regulated genes, conferring increased antiviral protection; (4) hCAF1 uses its deadenylase activity to accelerate degradation of STAT1-regulated mRNAs during IFN signal extinction.\",\n      \"method\": \"Co-immunoprecipitation (hCAF1–STAT1 interaction); hCAF1 siRNA knockdown; reporter/promoter occupancy assays; viral infection protection assays; deadenylase activity assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP for STAT1 interaction, KD with multiple functional readouts (gene expression, antiviral protection), deadenylase activity mechanistically linked\",\n      \"pmids\": [\"23386060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CNOT7/hCAF1, tristetraprolin (TTP), and CNOT1 form a co-immunoprecipitable complex; CNOT7 silencing stabilizes ICAM-1 and IL-8 mRNAs and increases their protein levels after TNF-α stimulation, establishing CNOT7 as the deadenylase effector downstream of TTP-ARE-mediated mRNA decay for these inflammatory targets.\",\n      \"method\": \"Co-immunoprecipitation (TTP–CNOT7–CNOT1 complex); RIP (TTP bound to ICAM-1 and IL-8 mRNAs); siRNA knockdown of CNOT7; mRNA stability and protein quantification\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP of trimeric complex, RIP, and KD with mRNA stability readout, single lab\",\n      \"pmids\": [\"25038453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CNOT7 is encoded by a dormant maternal mRNA in mouse oocytes that is recruited (translated) during meiotic maturation; the resulting increase in CNOT7 protein is necessary and sufficient to drive deadenylation of maternal mRNAs. Inhibiting the maturation-associated increase in CNOT7 via siRNA blocks mRNA deadenylation, whereas premature expression of CNOT7 in pre-maturation oocytes initiates deadenylation. Loss of the CNOT7 increase also causes ~70% decrease in transcription in 2-cell embryos.\",\n      \"method\": \"siRNA knockdown of CNOT7 during oocyte maturation; ectopic CNOT7 expression in meiotically arrested oocytes; poly(A) tail length assays; quantification of total poly(A); transcription assay in 2-cell embryos\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function and gain-of-function both tested with direct poly(A) readout, multiple orthogonal assays in single focused study\",\n      \"pmids\": [\"26134871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CNOT7 drives tumor cell-autonomous metastatic potential in a manner requiring its deadenylase activity and its interactions with CNOT1 and TOB1. CNOT7 RIP identified target transcripts enriched for a tripartite 3'UTR motif bound by RNA-binding proteins known to complex with CNOT7/TOB1/CNOT1, supporting a model of post-transcriptional suppression of a metastasis-suppressive transcriptional program.\",\n      \"method\": \"Orthotopic metastasis assays; genetically engineered mouse models; deadenylase-dead mutant rescue; co-immunoprecipitation for CNOT1 and TOB1 interactions; RIP-seq; transcriptome analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo metastasis model, catalytic mutant, protein interaction mapping, RIP-seq, multiple orthogonal methods\",\n      \"pmids\": [\"26807845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CNOT7 dynamically regulates dendritic mRNA poly(A) tail length and transport in hippocampal neurons; synaptic stimulation causes a rapid decrease in CNOT7, leading to transient poly(A) elongation of target mRNAs, followed by later deadenylation. CNOT7 is required for hippocampal-dependent learning and memory in mice.\",\n      \"method\": \"Live imaging and fractionation of CNOT7 in cultured hippocampal neurons; poly(A) tail length assays after synaptic stimulation; CNOT7 knockdown; in vivo behavioral/cognitive testing in mice\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct poly(A) assays, localization/level dynamics, KD phenotype, in vivo behavioral validation, multiple orthogonal approaches in single study\",\n      \"pmids\": [\"28723570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Alternative splicing of the CNOT7 gene produces a shorter isoform (CNOT7v2) that: (1) interacts with CCR4-NOT subunits but not BTG proteins; (2) localizes to the nucleus rather than cytoplasm; (3) lacks poly(A)-degrading activity in vitro despite conserved DEDD domain; (4) preferentially associates with PRMT1 to regulate its arginine methyltransferase activity; and (5) regulates inclusion of CD44 variable exons (alternative splicing).\",\n      \"method\": \"Biochemical characterization of splice variant; subcellular fractionation/localization; in vitro deadenylase assay; co-immunoprecipitation with PRMT1; alternative splicing reporter assays in cellulo\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro nuclease assay (negative result for v2), Co-IP with PRMT1, localization, splicing assay, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"28591869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In zebrafish, Cnot7-mediated deadenylation and Dcp2-mediated decapping make pervasive but nonuniform contributions to maternal mRNA clearance during maternal-to-zygotic transition; individual mRNAs differ in their relative dependency on each pathway.\",\n      \"method\": \"Overexpression of catalytically inactive Dcp2; RNA-seq to measure mRNA levels; comparison with Cnot7-depleted embryos\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq with catalytic mutant and comparative analysis, single lab, establishes pathway position for Cnot7 in mRNA clearance\",\n      \"pmids\": [\"28557307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CNOT7 and CNOT8 together are essential for cell viability in primary mouse embryonic fibroblasts (MEFs): Cnot7/8 double-KO MEFs undergo cell death, whereas Cnot6/6l double-KO MEFs remain viable. Exogenous catalytically dead CNOT7 cannot rescue viability, establishing that CNOT7/8 deadenylase activity is essential. In Cnot7/8-dKO MEFs, CNOT6/6L are also absent from the CCR4-NOT complex (detected by Co-IP), but CNOT6/6L alone are insufficient for cell viability.\",\n      \"method\": \"Double-knockout MEFs (Cnot7/8 and Cnot6/6l); catalytic mutant rescue experiment; co-immunoprecipitation to assess complex assembly; bulk poly(A) tail analysis; mRNA stability profiling\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — catalytic mutant, KO genetics with viability readout, complex assembly by Co-IP, poly(A) tail analysis, multiple orthogonal methods\",\n      \"pmids\": [\"31924127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CNOT7 outcompetes its paralog CNOT8 for incorporation into the CCR4-NOT complex: CNOT7 has greater affinity for the scaffold protein CNOT1 and can block CNOT8 from binding CNOT1. Depletion of CNOT7 increases CNOT8 incorporation into the CCR4-NOT complex and stabilizes CNOT8 protein. CNOT8 protein is less stable than CNOT7, and its increased abundance upon CNOT7 depletion is not due to mRNA stabilization or increased translation.\",\n      \"method\": \"Co-immunoprecipitation (CNOT7/CNOT8 competition for CNOT1); siRNA knockdown; protein stability assays; mRNA quantification; polysome/translation analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP competition assay, KD, protein and mRNA stability measurements, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"35248544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Small-molecule inhibitors of the CNOT7/Caf1 nuclease active site were identified; molecular docking suggests binding involves π-π interactions with His225, hydrogen bonding with the backbone of Phe43, and Van der Waals interactions with His225, Leu209, Leu112, and Leu115. Substituents on the 1-phenyl group of the inhibitor scaffold contribute significantly to binding potency.\",\n      \"method\": \"Fluorescence-based nuclease assay (biochemical IC50 determination); structure–activity relationship analysis of 16 analogues; molecular docking to active site\",\n      \"journal\": \"Molecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-3 / Moderate — in vitro enzymatic assay with SAR, docking (computational), single lab, no crystal structure validation\",\n      \"pmids\": [\"39339346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CNOT7 promotes radiation resistance in colorectal cancer by stabilizing XRCC6 protein: CNOT7 interacts with XRCC6 and inhibits TRIM21-mediated K48-linked ubiquitination at lysine 526 of XRCC6, preventing its proteasomal degradation and facilitating NHEJ-mediated DNA double-strand break repair. Additionally, CNOT7 uses its deadenylase activity to accelerate TRIM21 mRNA degradation, reducing TRIM21 levels.\",\n      \"method\": \"Co-immunoprecipitation (CNOT7–XRCC6 interaction); ubiquitination assay (K48-linkage at K526); CNOT7 KD in vitro and in vivo (xenograft); mRNA stability assay for TRIM21; DSB repair assays; PDX tumor models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination site mapping, KD with functional readout, mRNA stability assay, in vivo models, multiple orthogonal methods single lab\",\n      \"pmids\": [\"41249119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"High-throughput screening of 10,880 compounds identified 15 small-molecule inhibitors of CNOT7/Caf1 poly(A)-selective nuclease activity with IC50 values below 25 μM, providing chemical tools to differentiate catalytic from non-catalytic roles of CNOT7.\",\n      \"method\": \"Fluorescence-based biochemical nuclease assay screen; molecular docking for binding mode prediction\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — biochemical screen with docking, no structural validation or cellular mechanistic follow-up reported\",\n      \"pmids\": [\"41301481\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CNOT7 (hCAF1/Caf1a) is a DEDD-domain deadenylase and catalytic subunit of the CCR4-NOT complex that removes poly(A) tails from mRNAs to promote their decay; it is the dominant Caf1 paralog, outcompeting CNOT8 for binding to the scaffold protein CNOT1, and its deadenylase activity is essential for cell viability, mRNA turnover during oocyte maturation and maternal-to-zygotic transition, regulation of synaptic plasticity and cognition, innate immune signaling (via cytoplasmic sequestration of STAT1 and deadenylation of IFN-regulated mRNAs), spermatogenesis (as a coregulator of RXRβ in Sertoli cells), bone mass suppression (by antagonizing BMP signaling via interaction with TOB), anti-proliferative signaling (by serving as the effector for BTG/TOB proteins), and DNA repair–mediated radiation resistance (by stabilizing XRCC6 and deadenylating TRIM21 mRNA); an alternatively spliced nuclear isoform (CNOT7v2) lacks deadenylase activity but associates with PRMT1 to regulate arginine methylation and alternative splicing.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CNOT7 (hCAF1/Caf1a) is a DEDD-domain deadenylase and a catalytic subunit of the CCR4-NOT complex that removes mRNA poly(A) tails to control message stability and translation across diverse physiological programs [#3, #12]. It outcompetes its paralog CNOT8 for the scaffold subunit CNOT1, and CNOT7/CNOT8 deadenylase activity—not the CNOT6/6L deadenylases—is essential for cell viability, since catalytically dead CNOT7 fails to rescue death of Cnot7/8 double-knockout fibroblasts [#12, #13]. CNOT7 serves as the obligate deadenylase effector for the anti-proliferative BTG/TOB proteins, whose suppressive activity requires direct binding to CNOT7 [#4], and this CNOT7–TOB1–CNOT1 axis drives post-transcriptional silencing of a metastasis-suppressive program in tumor cells [#8]. Its catalytic activity executes regulated mRNA turnover in specialized contexts: deadenylation of maternal mRNAs during oocyte meiotic maturation and the maternal-to-zygotic transition [#7, #11], dynamic poly(A) tail control of dendritic mRNAs underlying learning and memory [#9], and TTP-directed decay of inflammatory ARE-containing transcripts such as ICAM-1 and IL-8 [#6]. In innate immunity CNOT7 sequesters latent STAT1 in the cytoplasm and deadenylates STAT1-regulated mRNAs to extinguish interferon signaling [#5]. CNOT7 also functions outside RNA decay: it binds the AF-1 domain of RXR\\u03b2 as a Sertoli-cell coregulator required for spermatogenesis [#0, #1], antagonizes BMP-induced osteoblast activity via TOB to suppress bone mass [#2], and promotes radiation resistance by stabilizing XRCC6 against TRIM21-mediated K48 ubiquitination while deadenylating TRIM21 mRNA [#15]. An alternatively spliced nuclear isoform, CNOT7v2, lacks deadenylase activity, does not bind BTG proteins, and instead associates with PRMT1 to regulate arginine methylation and alternative splicing [#10]. Small-molecule active-site inhibitors of CNOT7 have been developed as tools to separate its catalytic from non-catalytic roles [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established the first physiological role for CNOT7 by showing it acts as an RXR\\u03b2 coregulator in the somatic compartment of the testis, defining a cell-non-autonomous requirement for spermatogenesis.\",\n      \"evidence\": \"AF-1 domain binding assay, Cnot7 knockout phenotyping, and reciprocal spermatogonial transplantation in mice\",\n      \"pmids\": [\"15107851\", \"15700538\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not connect the RXR\\u03b2 coregulator role to deadenylase activity\", \"Molecular targets downstream of RXR\\u03b2/CNOT7 in Sertoli cells not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified CNOT7 as an endogenous suppressor of bone mass that antagonizes BMP-induced osteoblast activity through its interaction with the BMP inhibitor TOB, placing it within BMP signaling.\",\n      \"evidence\": \"Cnot7 knockout microCT/histomorphometry, in vitro and in vivo BMP stimulation of osteoblasts\",\n      \"pmids\": [\"17451368\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether bone suppression requires deadenylase activity not tested\", \"Direct mRNA targets in osteoblasts not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined CNOT7 as a DEDD-domain deadenylase required for cell proliferation, partly through its catalytic activity, with partial redundancy with CNOT8.\",\n      \"evidence\": \"siRNA knockdown of CNOT7/CNOT8 in MCF7 cells with catalytic mutant analysis and expression profiling\",\n      \"pmids\": [\"19605561\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic vs non-catalytic contributions only partially separated\", \"Specific proliferation-relevant target mRNAs not pinpointed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed BTG/TOB anti-proliferative proteins exert their effect specifically through CNOT7/CNOT8, establishing CNOT7 as the deadenylase effector of BTG/TOB and excluding CCR4 paralogs.\",\n      \"evidence\": \"Structure-guided mutagenesis of BTG2/TOB1 interaction surfaces with proliferation and mRNA/translation assays\",\n      \"pmids\": [\"23236473\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mRNA targets selectively regulated by the BTG/TOB-CNOT7 axis not enumerated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed a dual role for CNOT7 in interferon signaling—cytoplasmic sequestration of latent STAT1 and deadenylation of STAT1-regulated mRNAs—coupling protein trafficking control to mRNA decay during signal extinction.\",\n      \"evidence\": \"Reciprocal Co-IP for hCAF1-STAT1, siRNA knockdown, promoter occupancy and antiviral protection assays, deadenylase assay\",\n      \"pmids\": [\"23386060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of STAT1 shielding unknown\", \"How IFN triggers STAT1 release from hCAF1 not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Positioned CNOT7 as the deadenylase effector downstream of TTP in ARE-mediated decay of inflammatory mRNAs, linking it to TNF-\\u03b1-responsive gene regulation.\",\n      \"evidence\": \"Co-IP of TTP-CNOT7-CNOT1 complex, RIP, siRNA knockdown with mRNA stability and protein readouts\",\n      \"pmids\": [\"25038453\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP without reciprocal validation across systems\", \"Breadth of TTP-dependent targets requiring CNOT7 not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated that translational up-regulation of CNOT7 from a dormant maternal mRNA is necessary and sufficient to trigger maternal mRNA deadenylation during oocyte maturation, defining CNOT7 abundance as the rate-limiting switch.\",\n      \"evidence\": \"siRNA knockdown and ectopic expression in mouse oocytes with poly(A) tail and transcription assays\",\n      \"pmids\": [\"26134871\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling CNOT7 loss to reduced 2-cell transcription unclear\", \"Specificity for particular maternal transcripts not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected CNOT7 deadenylase activity and its CNOT1/TOB1 interactions to tumor-cell-autonomous metastatic potential via post-transcriptional suppression of a metastasis-suppressive program.\",\n      \"evidence\": \"Orthotopic metastasis and GEMM assays, catalytic-dead rescue, Co-IP, RIP-seq, transcriptome analysis\",\n      \"pmids\": [\"26807845\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of individual metastasis-suppressive effector transcripts not fully resolved\", \"RNA-binding proteins reading the tripartite 3'UTR motif not all defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed CNOT7 dynamically tunes dendritic mRNA poly(A) tail length in response to synaptic stimulation and is required for hippocampal learning and memory, extending its deadenylase role to neuronal plasticity.\",\n      \"evidence\": \"Live imaging, fractionation and poly(A) assays in hippocampal neurons, knockdown, in vivo behavioral testing\",\n      \"pmids\": [\"28723570\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling that drives rapid CNOT7 loss after stimulation unknown\", \"Specific synaptic mRNA targets not comprehensively identified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Characterized a nuclear, catalytically inactive splice isoform (CNOT7v2) that associates with PRMT1 and regulates arginine methylation and alternative splicing, revealing a deadenylase-independent function.\",\n      \"evidence\": \"Splice-variant biochemistry, fractionation, in vitro deadenylase assay, PRMT1 Co-IP, splicing reporter assays\",\n      \"pmids\": [\"28591869\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo significance of CNOT7v2 not established\", \"How v2 modulates PRMT1 activity mechanistically unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed Cnot7-mediated deadenylation alongside Dcp2 decapping as pervasive but non-uniform contributors to maternal mRNA clearance during the maternal-to-zygotic transition.\",\n      \"evidence\": \"RNA-seq comparison of Cnot7-depleted and catalytically inactive Dcp2 zebrafish embryos\",\n      \"pmids\": [\"28557307\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants of transcript-specific pathway preference not defined\", \"Single-organism, single-lab analysis\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established that CNOT7/CNOT8 deadenylase activity is essential for cell viability and that CNOT6/6L cannot substitute, formally ranking the two deadenylase pairs within the CCR4-NOT complex.\",\n      \"evidence\": \"Cnot7/8 and Cnot6/6l double-knockout MEFs with catalytic-dead rescue, Co-IP, poly(A) and mRNA stability profiling\",\n      \"pmids\": [\"31924127\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Essential target mRNAs whose dysregulation causes death not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Explained CNOT7 dominance over CNOT8 by showing it has higher affinity for the CNOT1 scaffold and blocks CNOT8 incorporation, with CNOT8 stabilized only when CNOT7 is depleted.\",\n      \"evidence\": \"Reciprocal Co-IP competition, knockdown, protein and mRNA stability and translation assays\",\n      \"pmids\": [\"35248544\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of differential CNOT1 affinity not resolved\", \"Functional consequence of CNOT8 substitution on target repertoire unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a non-canonical role in DNA repair whereby CNOT7 stabilizes XRCC6 by blocking TRIM21-mediated K48 ubiquitination and deadenylates TRIM21 mRNA, promoting NHEJ and radiation resistance in colorectal cancer.\",\n      \"evidence\": \"Co-IP, ubiquitination site mapping at K526, knockdown in vitro and in xenograft/PDX models, TRIM21 mRNA stability and DSB repair assays\",\n      \"pmids\": [\"41249119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CNOT7 sterically or enzymatically blocks TRIM21 ubiquitination unclear\", \"Generality beyond colorectal cancer untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided first chemical inhibitors of the CNOT7 nuclease active site with a defined predicted binding mode, enabling pharmacological dissection of catalytic function.\",\n      \"evidence\": \"Fluorescence nuclease IC50 assay, SAR of 16 analogues, molecular docking\",\n      \"pmids\": [\"39339346\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No crystal structure confirming docked binding mode\", \"Cellular potency and selectivity not demonstrated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Expanded the inhibitor toolkit through high-throughput screening, yielding multiple sub-25 \\u03bcM CNOT7 nuclease inhibitors to differentiate catalytic from non-catalytic roles.\",\n      \"evidence\": \"Fluorescence biochemical nuclease screen of 10,880 compounds with docking\",\n      \"pmids\": [\"41301481\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural validation or cellular mechanistic follow-up\", \"Selectivity over CNOT8/CNOT6 not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CNOT7 substrate selectivity, recruitment by distinct RNA-binding adaptors, and its catalytic versus scaffolding/protein-stabilizing functions are coordinated across its many physiological contexts remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying determinant of context-specific target choice identified\", \"Structural basis for adaptor (BTG/TOB, TTP, STAT1, XRCC6) discrimination unknown\", \"Relative in vivo importance of catalytic vs non-catalytic roles not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [3, 7, 9, 12]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [3, 12]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 9, 10]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [3, 7, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 15]}\n    ],\n    \"complexes\": [\"CCR4-NOT\"],\n    \"partners\": [\"CNOT1\", \"CNOT8\", \"TOB1\", \"BTG2\", \"STAT1\", \"PRMT1\", \"XRCC6\", \"RXRB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":8,"faith_pct":87.5}}