{"gene":"AKAP8","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":1998,"finding":"AKAP95 is localized to the nucleus in interphase cells, while RIIα is excluded from the nucleus; during mitosis, AKAP95 redistributes and co-localizes with RIIα outside the metaphase plate, and RIIα is co-immunoprecipitated with AKAP95 from mitotic but not interphase HeLa cells, demonstrating a cell cycle-dependent physical association.","method":"Immunofluorescence microscopy, co-immunoprecipitation from synchronized HeLa cells","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with cell-cycle synchronization, replicated in subsequent studies","pmids":["9473338"],"is_preprint":false},{"year":1999,"finding":"AKAP95 associates with the nuclear matrix in interphase and redistributes to chromatin at mitosis; intranuclear immunoblocking of AKAP95 inhibits chromosome condensation in a PKA-independent manner; depletion of AKAP95 from mitotic extract causes premature chromatin decondensation; maintenance of condensed chromatin requires PKA binding to chromatin-associated AKAP95 and cAMP signaling; AKAP95 interacts with Eg7 (hCAP-D2), a component of the condensin complex, and is required for Eg7 recruitment to chromatin.","method":"Cell fractionation, in vitro chromosome condensation assay with recombinant AKAP95 fragments, intranuclear immunoblocking, immunodepletion from mitotic extract, co-immunoprecipitation, GST pull-down","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods including reconstitution with recombinant fragments, immunodepletion rescue, and epistasis; replicated in subsequent studies","pmids":["10601332"],"is_preprint":false},{"year":2000,"finding":"AKAP95 acts as a targeting/receptor protein for hCAP-D2/Eg7 (condensin component) to chromosomes; recombinant AKAP95 C-terminal fragment binds chromatin and recruits Eg7 in a concentration-dependent manner correlating with extent of chromosome condensation; GST pull-down data suggest AKAP95 recruits multiple condensin subunits.","method":"In vitro chromosome condensation assay, recombinant protein addition/rescue, GST pull-down, immunofluorescence co-localization","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with recombinant protein and concentration-dependent rescue, replicated across two papers","pmids":["10791967"],"is_preprint":false},{"year":2001,"finding":"AKAP95 is targeted to the nuclear matrix via a distinct nuclear matrix-targeting site (separate from DNA- and PKA-binding domains); AKAP95 directly binds isolated nuclear matrix in a targeting-site-dependent manner; AKAP95 interacts with p68 RNA helicase both in vitro and in co-immunoprecipitation from cell extracts, with co-localization in the nuclear matrix.","method":"Mutational analysis, in situ nuclear matrix binding, yeast two-hybrid, Far Western blot, co-immunoprecipitation, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (yeast two-hybrid, in vitro binding, Co-IP, mutagenesis) in single study","pmids":["11279182"],"is_preprint":false},{"year":2001,"finding":"CDK1 phosphorylates RIIα on threonine 54 (T54) at mitosis, creating a molecular switch that controls RIIα anchoring to chromatin-bound AKAP95; RIIα(T54E) phosphomimetic fails to associate with chromatin-bound AKAP95 at mitosis; disrupting AKAP95-RIIα anchoring promotes premature chromatin decondensation; wild-type RIIα or RIIα(T54D) rescues decondensation in RIIα-deficient cells.","method":"Stably transfected RIIα-deficient cell lines with wild-type and point mutants, cell fractionation, in vitro chromatin condensation/decondensation assay, nuclear reconstitution assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis with multiple point mutants, in vitro reconstitution, rescue experiments","pmids":["11591814"],"is_preprint":false},{"year":2002,"finding":"AMY-1 binds to the RII-binding region of AKAP95 in vivo and in vitro, forming a ternary complex with RII; this AMY-1/AKAP95/RII complex prevents the PKA catalytic subunit from binding to the AKAP complex, suppressing PKA activity.","method":"Co-immunoprecipitation, in vitro binding assay, PKA activity assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP plus in vitro binding plus functional PKA assay, single lab","pmids":["12414807"],"is_preprint":false},{"year":2002,"finding":"Chromatin binding of AKAP95 is conferred by residues 387–450 and requires zinc finger ZF1; residues 525–569 are essential for condensation activity and condensin recruitment; ZF2 (C-terminal zinc finger) is required for condensin targeting whereas ZF1 is dispensable for this; AKAP95 interacts with Xenopus XCAP-H condensin subunit in vitro and in vivo but not with human hCAP-D2; condensin recruitment to chromatin is not sufficient to promote condensation.","method":"Deletion and point mutant analysis, in vitro chromosome condensation assay, GST pull-down, co-immunoprecipitation","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis with functional reconstitution in vitro, single lab","pmids":["11964380"],"is_preprint":false},{"year":2003,"finding":"AKAP95 interacts with MCM2 (a component of the pre-replication complex) via its N-terminal residues 1–195; disrupting the AKAP95-MCM2 interaction inside HeLa nuclei abolishes initiation of DNA replication in G1 and elongation phase in vitro; depletion of AKAP95 from nuclei partially depletes MCM2 and abolishes replication; recombinant AKAP95 restores intranuclear MCM2 and replication in a dose-dependent manner.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation from chromatin, intranuclear peptide disruption, in vitro DNA replication assay, recombinant protein rescue","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with recombinant protein, dose-dependent rescue, multiple orthogonal methods","pmids":["12740381"],"is_preprint":false},{"year":2004,"finding":"AKAP95 physically interacts with all three D-type cyclins (D1, D2, D3) but not with CDK4 or p27kip1; CDK4 displaces the cyclin D3–AKAP95 interaction; endogenous interactions confirmed in thyrocytes, human fibroblasts, and NIH-3T3 cells.","method":"Yeast two-hybrid, co-immunoprecipitation from multiple cell types, co-transfection","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid validated by Co-IP across multiple cell lines, single lab","pmids":["14641107"],"is_preprint":false},{"year":2006,"finding":"AKAP95 binds cyclin E1, and G1/S cyclins (D and E) can interact with the RIIα subunit of PKA through AKAP95; CDKs displace cyclins from AKAP95, suggesting distinct cyclin–CDK vs. cyclin–AKAP95–PKA complexes.","method":"Co-immunoprecipitation, competition assay with CDKs","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP with competition assay, consistent with prior D-cyclin findings, single lab","pmids":["16721056"],"is_preprint":false},{"year":2006,"finding":"Fidgetin (an AAA ATPase) physically interacts with AKAP95 in the nuclear matrix; genetic interaction between fidgetin and AKAP95 is required for palatogenesis in mice — double mutants (fidget + Akap95 gene-trap) exhibit cleft palate lethality not seen in single mutants.","method":"Yeast two-hybrid, co-immunofluorescence, reciprocal co-immunoprecipitation, genetic epistasis in mice (gene trap + existing mutant)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, co-localization, and in vivo genetic epistasis","pmids":["16751186"],"is_preprint":false},{"year":2009,"finding":"PKA anchored via AKAP95 suppresses LPS-induced TNF-α production in macrophages; AKAP95-anchored PKA phosphorylates p105 (NF-κB1) at a site adjacent to the IKK target region, thereby suppressing TNFα gene expression downstream of TLR4.","method":"Multigene RNAi screening, selective PKA-anchoring inhibitors, time-lapse microscopy, cAMP analog treatment","journal":"Science signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi knockdown with specific anchoring inhibitors and identified phosphorylation substrate, single lab","pmids":["19531803"],"is_preprint":false},{"year":2013,"finding":"AKAP95 physically and functionally associates with MLL1 and MLL2 histone methyltransferase complexes; AKAP95 directly enhances MLL2 H3K4 methyltransferase activity in a cell-free chromatin transcription system; ectopic AKAP95 stimulates chromosomal reporter gene expression in synergy with MLL1 or MLL2; AKAP95 depletion impairs retinoic acid-mediated gene induction in embryonic stem cells.","method":"Biochemical purification, in vitro H3K4 methylation assay, cell-free chromatin transcription assay, co-immunoprecipitation, siRNA knockdown with reporter assay","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay reconstitution plus co-IP plus cell-based functional assay, single rigorous study","pmids":["23995757"],"is_preprint":false},{"year":2015,"finding":"Tyrosine phosphorylation of AKAP8 by nuclear tyrosine kinases (Src, Fyn, c-Abl, nucleus-targeted Lyn/c-Src) dissociates AKAP8 from chromatin and the nuclear matrix; substitution of multiple AKAP8 tyrosines to phenylalanine inhibits its dissociation from nuclear structures and suppresses kinase-induced chromatin structural changes; AKAP8 knockdown increases chromatin structural changes; hydrogen peroxide induces chromatin structural changes accompanied by AKAP8 dissociation.","method":"Phosphorylation assays, tyrosine-to-phenylalanine mutagenesis, cell fractionation, chromatin structural change assay, RNAi knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis with functional readout plus fractionation and KD, multiple orthogonal approaches in single study","pmids":["25770215"],"is_preprint":false},{"year":2016,"finding":"AKAP95 interacts with hnRNP H/F and U proteins through its N-terminal region, and directly binds preferentially to proximal intronic regions on pre-mRNAs via its zinc-finger domains to promote exon inclusion; AKAP95 also interacts with itself (self-association); AKAP95 is established as a regulator of pre-mRNA splicing and a potential integrator of transcription and splicing.","method":"RNA immunoprecipitation (RIP), CLIP-seq/transcriptome-wide analysis, co-immunoprecipitation, RNA splicing assays, RNAi knockdown","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide RNA binding data plus Co-IP of protein partners plus functional splicing assays, multiple orthogonal methods","pmids":["27824034"],"is_preprint":false},{"year":2016,"finding":"A subpopulation of AKAP95 localizes to the nucleolus during interphase, associates with ribosomal chromatin (ChIP), co-localizes with upstream binding factor (UBF), binds GC-rich DNA in vitro (SELEX), and is a highly mobile protein by FRAP; AKAP95 expression reciprocally regulates 47S rRNA production — AKAP95 is a regulator of ribosomal RNA synthesis.","method":"ChIP, SELEX, FRAP, immunofluorescence co-localization, siRNA knockdown with rRNA quantification","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (ChIP, FRAP, SELEX, knockdown with functional readout) in single lab study","pmids":["26683827"],"is_preprint":false},{"year":2016,"finding":"AKAP95 and Cx43 dynamically interact during cell cycle progression; Cx43 translocates to the nucleus via AKAP95 in late G1; their interaction is reduced by PKA inhibitor H89 and enhanced by forskolin, implicating PKA signaling in the interaction.","method":"Co-immunoprecipitation, tandem mass spectrometry, confocal immunofluorescence, Western blot","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP validated by MS and imaging across cell cycle phases, single lab","pmids":["26880274"],"is_preprint":false},{"year":2017,"finding":"AKAP95 forms a nuclear signaling complex with PKA and PDE4D5 that controls a local cAMP microdomain; locally generated cAMP accumulates within this complex, but plasma membrane-generated cAMP is prevented from activating nuclear PKA by PDE4 (local sink) and PDE3 (barrier).","method":"FRET-based cAMP biosensor (live cell imaging), pharmacological manipulation of PDE activity, co-immunoprecipitation","journal":"Cell chemical biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell FRET biosensor with pharmacological dissection, single lab","pmids":["30982750"],"is_preprint":false},{"year":2017,"finding":"AKAP95 interacts with nucleoporin TPR specifically in mitosis (identified by BioID proximity screen and confirmed by Co-IP); AKAP95 depletion causes faster prometaphase-to-anaphase transition, escape from nocodazole-induced mitotic arrest, formation of micronuclei from lagging chromosomes, and partial delocalization of the spindle assembly checkpoint component MAD1 from kinetochores; AKAP95 is required for proper spindle assembly checkpoint function.","method":"BioID proximity labeling proteomics, co-immunoprecipitation, RNAi depletion with mitotic timing assays, immunofluorescence for MAD1 kinetochore localization, nocodazole arrest assay","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BioID plus Co-IP plus functional KD phenotypes, single lab","pmids":["28379780"],"is_preprint":false},{"year":2017,"finding":"AKAP95-anchored nuclear PKA is required for cortisol-induced PTGS2 (COX-2) expression in human amnion fibroblasts; cortisol increases AKAP95 expression, expanding the nuclear PKA pool; AKAP95 knockdown reduces nuclear PKA and phospho-CREB, attenuating cortisol-induced PTGS2 expression without affecting STAT3 phosphorylation.","method":"siRNA knockdown in primary human amnion fibroblasts, Western blot for nuclear PKA/phospho-CREB/COX-2, qRT-PCR for PTGS2, human tissue analysis (amnion after labor vs. cesarean section)","journal":"Science signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific KD with defined molecular and functional readouts, validated in human tissue, single lab","pmids":["29162743"],"is_preprint":false},{"year":2018,"finding":"The PKA-binding domain of AKAP8 is essential for direct interaction with DPY30 (core subunit of H3K4 HMT complexes); a single L69D substitution in DPY30 abolishes its dimerization and interaction with both AKAP8 and BIG1; AKAP8 interacts with DPY30 and RIIα in both interphase and mitotic cells.","method":"Co-immunoprecipitation, in vitro binding with domain mutants, point mutagenesis (L69D DPY30), cell cycle-synchronized binding assays","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus Co-IP across cell cycle phases, single lab","pmids":["29288530"],"is_preprint":false},{"year":2020,"finding":"AKAP95 forms phase-separated, liquid-like condensates in vitro and in the nucleus; condensate formation is required for its splicing regulatory activity; hardening of condensates significantly impairs splice regulation; substitution of the condensation-mediating region with unrelated condensation-mediating sequences restores activity; AKAP95 condensates are required for supporting cancer cell growth and suppressing oncogene-induced senescence.","method":"In vitro phase separation assay, FRAP (fluorescence recovery after photobleaching), condensate-disrupting/hardening mutations, chimeric protein rescue, splicing reporter assays, cell growth and senescence assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in vitro plus mutagenesis with functional rescue plus multiple cellular readouts, rigorous single study","pmids":["32719551"],"is_preprint":false},{"year":2020,"finding":"AKAP8 inhibits hnRNPM splicing activity through direct protein-protein interaction, and directly binds RNA to alter splicing outcomes; AKAP8 promotes an epithelial-cell-state splicing program genome-wide; AKAP8 loss promotes EMT-associated alternative splicing and breast cancer metastasis; CLSTN1 is an AKAP8 splicing target whose isoform switch is crucial for EMT.","method":"Co-immunoprecipitation (AKAP8-hnRNPM interaction), RNA binding assays, RNA-seq/splicing analysis, shRNA knockdown, metastasis assays in vivo, CLSTN1 isoform manipulation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of protein interaction, RNA binding, genome-wide splicing analysis, and in vivo functional readout","pmids":["31980632"],"is_preprint":false},{"year":2023,"finding":"AKAP8 is secreted by FBXW7 mutant colorectal cancer cells and induces DNA damage in neighboring wildtype cells; overexpression of AKAP8 in wildtype cells recapitulates the DNA damage phenotype; co-culture with double-mutant FBXW7-/-/AKAP8-/- cells abrogates this paracrine DNA damage.","method":"CRISPR-Cas9 knockout, Transwell co-culture, mass spectrometry (identification of secreted AKAP8), AKAP8 overexpression, AKAP8/FBXW7 double knockout","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout rescue experiment plus overexpression phenocopy, single lab","pmids":["37386001"],"is_preprint":false},{"year":2024,"finding":"AKAP8 is enriched at chromatin and regulates transcription of a specific short isoform of hnRNPUL1 through phase separation; ectopic expression of the hnRNPUL1 short isoform partially rescues growth inhibition caused by AKAP8 knockdown; AKAP8 modulates PARP1 expression through hnRNPUL1, and AKAP8 inhibition enhances PARP inhibitor cytotoxicity.","method":"ChIP, RNA-seq, siRNA knockdown, overexpression rescue, PARP inhibitor sensitivity assay, phase separation assay","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus transcription assay plus rescue experiment plus pharmacological readout, single lab","pmids":["38711442"],"is_preprint":false},{"year":2026,"finding":"AKAP95 phase separation and RNA binding properties modulate RNA Pol II recruitment into transcriptional condensates at genome-wide target sites; AKAP95 interacts with MLL1 translocated fragment (MLL-AF9), and partial co-condensation leads to stronger AKAP95 binding at MLL-AF9 target genes; loss of AKAP95 downregulates MLL-AF9 target gene expression and impairs MLL-AF9-driven leukemogenesis; a peptide (JD-PI95) bridging AKAP95 to HSP70 impairs AKAP95 phase separation and attenuates gene transcription.","method":"ChIP-seq, RNA-seq, CRISPR knockout, co-immunoprecipitation, in vitro phase separation, peptide design and functional assay, leukemogenesis assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide ChIP-seq plus reconstitution of phase separation plus genetic KO with functional rescue and therapeutic peptide validation, multiple orthogonal methods","pmids":["41501053"],"is_preprint":false}],"current_model":"AKAP8/AKAP95 is a multifunctional nuclear scaffold protein that anchors PKA (via RIIα binding) to specific nuclear substrates including chromatin at mitosis, recruits condensin (via hCAP-D2/Eg7 and XCAP-H) to drive chromosome condensation, interacts with MCM2 to support DNA replication initiation, associates with MLL1/MLL2 complexes to enhance H3K4 methylation and transcription, regulates pre-mRNA splicing by directly binding intronic RNA and scaffolding hnRNP proteins, forms liquid-like phase-separated condensates whose proper biophysical properties are required for splicing and transcriptional regulation, controls a nuclear cAMP microdomain together with PDE4D5, is regulated by CDK1-mediated T54 phosphorylation of RIIα (controlling mitotic chromatin association) and by nuclear tyrosine kinases (Src/Fyn/c-Abl-mediated phosphorylation dissociating it from chromatin), and is required for proper spindle assembly checkpoint function through interaction with nucleoporin TPR."},"narrative":{"mechanistic_narrative":"AKAP8 (AKAP95) is a nuclear matrix scaffold protein that organizes cell-cycle-dependent signaling and chromatin events by anchoring protein kinase A (PKA) and recruiting effector machinery to defined nuclear substrates [PMID:9473338, PMID:10601332]. It is nuclear in interphase and redistributes to chromatin at mitosis, where it captures the PKA RIIα subunit through a CDK1-controlled molecular switch: CDK1 phosphorylation of RIIα at T54 governs RIIα anchoring to chromatin-bound AKAP8, and disrupting this anchoring drives premature chromatin decondensation [PMID:9473338, PMID:11591814]. At mitosis AKAP8 acts as a chromatin receptor that recruits the condensin complex (via hCAP-D2/Eg7 and XCAP-H) to promote chromosome condensation, using distinct chromatin-binding and condensin-targeting zinc-finger regions [PMID:10601332, PMID:10791967, PMID:11964380]. In interphase it interacts with MCM2 to support initiation of DNA replication [PMID:12740381] and associates with MLL1/MLL2 H3K4 methyltransferase complexes—binding the core subunit DPY30—to enhance H3K4 methylation and stimulate transcription [PMID:23995757, PMID:29288530]. AKAP8 is also a pre-mRNA splicing regulator that binds proximal intronic RNA through its zinc fingers and scaffolds hnRNP H/F/U proteins to control exon inclusion, inhibiting hnRNPM to enforce an epithelial splicing program whose loss promotes EMT and breast cancer metastasis [PMID:27824034, PMID:31980632]. These chromatin and RNA functions depend on AKAP8 forming liquid-like phase-separated condensates: condensate integrity is required for splicing regulation, for recruiting RNA Pol II into transcriptional condensates, and for cancer cell growth, and pharmacological disruption of phase separation attenuates MLL-AF9-driven leukemogenesis [PMID:32719551, PMID:41501053]. AKAP8 chromatin association is dynamically released by nuclear tyrosine kinase (Src/Fyn/c-Abl) phosphorylation, linking it to chromatin structural remodeling [PMID:25770215]. Beyond anchoring PKA, AKAP8 organizes a nuclear cAMP microdomain together with PDE4D5 [PMID:30982750] and is required for proper spindle assembly checkpoint function via interaction with the nucleoporin TPR [PMID:28379780].","teleology":[{"year":1998,"claim":"Established that AKAP8 anchors PKA in a cell-cycle-dependent manner, defining it as a nuclear A-kinase anchoring protein rather than a constitutive PKA scaffold.","evidence":"Immunofluorescence and reciprocal Co-IP from synchronized HeLa cells showing mitosis-specific RIIα association","pmids":["9473338"],"confidence":"High","gaps":["Did not define the chromatin substrate or downstream consequence of mitotic PKA anchoring","Mechanism of cell-cycle-dependent redistribution unresolved"]},{"year":1999,"claim":"Answered what AKAP8 does at mitosis by showing it is required for chromosome condensation and recruits condensin to chromatin, separating a structural role from PKA anchoring.","evidence":"In vitro condensation assays, immunodepletion/rescue from mitotic extract, intranuclear immunoblocking, and Co-IP with Eg7/hCAP-D2","pmids":["10601332"],"confidence":"High","gaps":["Did not map the domains required for chromatin vs condensin binding","Relationship between PKA-dependent and PKA-independent condensation roles unclear"]},{"year":2000,"claim":"Defined AKAP8 as a concentration-dependent chromatin receptor for condensin, linking the amount of recruited condensin to the extent of condensation.","evidence":"Recombinant C-terminal fragment addition with dose-dependent rescue and GST pull-down of condensin subunits","pmids":["10791967"],"confidence":"High","gaps":["Whether recruitment alone or additional activity drives condensation not resolved"]},{"year":2001,"claim":"Resolved the modular architecture and the mitotic switch: a nuclear-matrix-targeting site distinct from DNA/PKA domains, and CDK1 phosphorylation of RIIα T54 controlling anchoring to chromatin.","evidence":"Mutational/nuclear-matrix binding analysis plus RIIα phosphomimetic point mutants with reconstitution and rescue; identification of p68 RNA helicase partner","pmids":["11279182","11591814"],"confidence":"High","gaps":["How tethering RIIα mechanistically maintains condensation not defined","Functional role of p68 helicase interaction not pursued"]},{"year":2002,"claim":"Dissected the zinc-finger requirements (ZF1 for chromatin binding, ZF2 for condensin targeting) and showed condensin recruitment is necessary but not sufficient for condensation.","evidence":"Systematic deletion/point mutagenesis with in vitro condensation assays and XCAP-H pull-downs; AMY-1 ternary complex suppressing PKA activity","pmids":["11964380","12414807"],"confidence":"Medium","gaps":["The additional step beyond recruitment needed for condensation unidentified","AMY-1 regulatory mechanism shown in single lab"]},{"year":2003,"claim":"Extended AKAP8 function into S phase by showing its N-terminal interaction with MCM2 is required for DNA replication initiation and elongation.","evidence":"Yeast two-hybrid, intranuclear peptide disruption, in vitro replication assay, and dose-dependent recombinant rescue","pmids":["12740381"],"confidence":"High","gaps":["How AKAP8 mechanistically promotes MCM2 chromatin retention not defined"]},{"year":2004,"claim":"Connected AKAP8 to cell-cycle cyclin regulation by showing direct binding to D- and E-type cyclins displaced by CDKs, defining cyclin–AKAP8–PKA versus cyclin–CDK pools.","evidence":"Yeast two-hybrid, Co-IP across multiple cell types, and CDK competition assays","pmids":["14641107","16721056"],"confidence":"Medium","gaps":["Functional consequence of cyclin sequestration on cell-cycle progression untested","Single lab"]},{"year":2006,"claim":"Revealed organismal and inflammatory roles: a genetic interaction with fidgetin required for palatogenesis, and AKAP8-anchored PKA suppressing TLR4-driven TNFα.","evidence":"In vivo mouse genetic epistasis with reciprocal Co-IP; RNAi screening with anchoring inhibitors and p105 phosphorylation analysis","pmids":["16751186","19531803"],"confidence":"Medium","gaps":["Molecular basis of the fidgetin-AKAP8 developmental requirement unclear","TNFα phosphorylation findings from a single lab"]},{"year":2013,"claim":"Established AKAP8 as a positive transcriptional/epigenetic regulator by showing it associates with and directly enhances MLL1/MLL2 H3K4 methyltransferase activity.","evidence":"Biochemical purification, in vitro H3K4 methylation and chromatin transcription assays, Co-IP, and reporter assays in ES cells","pmids":["23995757"],"confidence":"High","gaps":["Direct subunit contact within the MLL complex not yet defined (resolved later as DPY30)"]},{"year":2015,"claim":"Identified tyrosine phosphorylation by Src/Fyn/c-Abl as a regulatory switch that dissociates AKAP8 from chromatin and drives chromatin structural changes.","evidence":"Phosphorylation assays, tyrosine-to-phenylalanine mutagenesis, cell fractionation, and RNAi with chromatin structural readouts","pmids":["25770215"],"confidence":"High","gaps":["Which specific tyrosines are physiologically targeted not pinpointed","Link to oxidative-stress signaling correlative"]},{"year":2016,"claim":"Defined AKAP8 as a direct pre-mRNA splicing regulator and rRNA synthesis modulator, broadening its role beyond chromatin to RNA metabolism.","evidence":"CLIP-seq/RIP showing intronic RNA binding and hnRNP H/F/U interactions; ChIP, SELEX, and FRAP at the nucleolus with rRNA quantification; Cx43 nuclear translocation Co-IP/MS","pmids":["27824034","26683827","26880274"],"confidence":"High","gaps":["How RNA binding and chromatin functions are coordinated not resolved","rRNA and Cx43 findings from single labs"]},{"year":2017,"claim":"Refined the nuclear PKA module by defining an AKAP8–PKA–PDE4D5 cAMP microdomain, a TPR-dependent spindle checkpoint role, and a CREB-dependent transcriptional output.","evidence":"FRET cAMP biosensors with PDE pharmacology; BioID/Co-IP and RNAi mitotic-timing phenotypes; siRNA with nuclear PKA/phospho-CREB readouts validated in human amnion tissue","pmids":["30982750","28379780","29162743"],"confidence":"Medium","gaps":["How a single scaffold integrates microdomain, checkpoint, and transcription functions unclear","Each finding from a single lab"]},{"year":2018,"claim":"Pinpointed DPY30 as the physical bridge between AKAP8's PKA-binding domain and H3K4 methyltransferase complexes, mechanizing the earlier MLL association.","evidence":"Co-IP, domain and L69D point mutagenesis, and cell-cycle-synchronized binding assays","pmids":["29288530"],"confidence":"Medium","gaps":["Whether DPY30 bridging is required for H3K4 methylation enhancement in vivo not directly tested","Single lab"]},{"year":2020,"claim":"Revealed that AKAP8 function depends on liquid-liquid phase separation and that its splicing program enforces an epithelial cell state suppressing EMT and metastasis.","evidence":"In vitro phase separation, FRAP, condensate-hardening/chimeric rescue, splicing reporters, and growth/senescence assays; hnRNPM inhibition, RNA-seq, and in vivo metastasis assays with CLSTN1 isoform manipulation","pmids":["32719551","31980632"],"confidence":"High","gaps":["The endogenous sequence determinants of condensation only partially defined","Direct mechanistic link between condensate biophysics and specific splicing decisions incomplete"]},{"year":2023,"claim":"Uncovered a paracrine function in which AKAP8 secreted by FBXW7-mutant cancer cells induces DNA damage in neighboring cells.","evidence":"CRISPR knockout, Transwell co-culture, mass spectrometry identification of secreted AKAP8, and double-knockout abrogation","pmids":["37386001"],"confidence":"Medium","gaps":["Mechanism of AKAP8 secretion and the receptor/pathway driving DNA damage unknown","Single lab"]},{"year":2024,"claim":"Linked AKAP8 phase separation to a specific transcriptional output controlling PARP1 levels via an hnRNPUL1 short isoform, defining a PARP-inhibitor sensitivity axis.","evidence":"ChIP, RNA-seq, knockdown/rescue, phase separation assays, and PARP inhibitor cytotoxicity assays","pmids":["38711442"],"confidence":"Medium","gaps":["How AKAP8 condensates select the hnRNPUL1 short isoform mechanistically unclear","Single lab"]},{"year":2026,"claim":"Established that AKAP8 phase separation and RNA binding recruit RNA Pol II into transcriptional condensates and co-condense with MLL-AF9 to sustain leukemogenesis, validating a therapeutic phase-separation-disrupting peptide.","evidence":"ChIP-seq, RNA-seq, CRISPR knockout, in vitro phase separation, Co-IP, and JD-PI95 peptide leukemogenesis assays","pmids":["41501053"],"confidence":"High","gaps":["Generality of condensate-driven Pol II recruitment beyond MLL-AF9 targets not fully mapped","In vivo therapeutic window of JD-PI95 not established"]},{"year":null,"claim":"How AKAP8's diverse activities—PKA anchoring, condensin recruitment, replication, H3K4 methylation, splicing, and Pol II condensate formation—are spatiotemporally coordinated by a single phase-separating scaffold remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking condensate biophysics to substrate selection across cell-cycle phases","No structural model of the full-length scaffold with its partners","How post-translational switches (CDK1, tyrosine kinases) globally reprogram its functions unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,2,7,12,14]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[14,22]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[6,15]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,11,12]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[12,24,25]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,3]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[1,2,13]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[15]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[3,14,21]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,1,4,18]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[7]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[14,22,24]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[12,25]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[1,2,12,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,17,19]}],"complexes":["condensin","MLL1/MLL2 H3K4 methyltransferase complex","AKAP8-PKA(RIIα)-PDE4D5 complex"],"partners":["PRKAR2A","MCM2","DPY30","HNRNPM","TPR","PDE4D5","CCND3","GJA1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O43823","full_name":"A-kinase anchor protein 8","aliases":["A-kinase anchor protein 95 kDa","AKAP 95"],"length_aa":692,"mass_kda":76.1,"function":"Anchoring protein that mediates the subcellular compartmentation of cAMP-dependent protein kinase (PKA type II) (PubMed:9473338). Acts as an anchor for a PKA-signaling complex onto mitotic chromosomes, which is required for maintenance of chromosomes in a condensed form throughout mitosis. Recruits condensin complex subunit NCAPD2 to chromosomes required for chromatin condensation; the function appears to be independent from PKA-anchoring (PubMed:10601332, PubMed:10791967, PubMed:11964380). May help to deliver cyclin D/E to CDK4 to facilitate cell cycle progression (PubMed:14641107). Required for cell cycle G2/M transition and histone deacetylation during mitosis. In mitotic cells recruits HDAC3 to the vicinity of chromatin leading to deacetylation and subsequent phosphorylation at 'Ser-10' of histone H3; in this function may act redundantly with AKAP8L (PubMed:16980585). Involved in nuclear retention of RPS6KA1 upon ERK activation thus inducing cell proliferation (PubMed:22130794). May be involved in regulation of DNA replication by acting as scaffold for MCM2 (PubMed:12740381). Enhances HMT activity of the KMT2 family MLL4/WBP7 complex and is involved in transcriptional regulation. In a teratocarcinoma cell line is involved in retinoic acid-mediated induction of developmental genes implicating H3 'Lys-4' methylation (PubMed:23995757). May be involved in recruitment of active CASP3 to the nucleus in apoptotic cells (PubMed:16227597). May act as a carrier protein of GJA1 for its transport to the nucleus (PubMed:26880274). May play a repressive role in the regulation of rDNA transcription. Preferentially binds GC-rich DNA in vitro. In cells, associates with ribosomal RNA (rRNA) chromatin, preferentially with rRNA promoter and transcribed regions (PubMed:26683827). Involved in modulation of Toll-like receptor signaling. Required for the cAMP-dependent suppression of TNF in early stages of LPS-induced macrophage activation; the function probably implicates targeting of PKA to NFKB1 (By similarity)","subcellular_location":"Nucleus; Nucleus matrix; Nucleus, nucleolus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O43823/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AKAP8","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CPSF6","stoichiometry":0.2},{"gene":"DDX21","stoichiometry":0.2},{"gene":"HNRNPH1","stoichiometry":0.2},{"gene":"PASK","stoichiometry":0.2},{"gene":"PRKACA","stoichiometry":0.2},{"gene":"RBM14","stoichiometry":0.2},{"gene":"RHOA","stoichiometry":0.2},{"gene":"SNRPA","stoichiometry":0.2},{"gene":"SNRPB","stoichiometry":0.2},{"gene":"SNRPC","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/AKAP8","total_profiled":1310},"omim":[{"mim_id":"609475","title":"A-KINASE ANCHOR PROTEIN 8-LIKE PROTEIN; AKAP8L","url":"https://www.omim.org/entry/609475"},{"mim_id":"604692","title":"A-KINASE ANCHOR PROTEIN 8; AKAP8","url":"https://www.omim.org/entry/604692"},{"mim_id":"603870","title":"CORE-BINDING FACTOR, ALPHA SUBUNIT 2, TRANSLOCATED TO, 3; CBFA2T3","url":"https://www.omim.org/entry/603870"},{"mim_id":"603734","title":"INTERFERON REGULATORY FACTOR 3; IRF3","url":"https://www.omim.org/entry/603734"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/AKAP8"},"hgnc":{"alias_symbol":["AKAP95","DKFZp586B1222"],"prev_symbol":[]},"alphafold":{"accession":"O43823","domains":[{"cath_id":"-","chopping":"368-455_477-548","consensus_level":"medium","plddt":81.8518,"start":368,"end":548}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43823","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43823-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43823-F1-predicted_aligned_error_v6.png","plddt_mean":52.66},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AKAP8","jax_strain_url":"https://www.jax.org/strain/search?query=AKAP8"},"sequence":{"accession":"O43823","fasta_url":"https://rest.uniprot.org/uniprotkb/O43823.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43823/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43823"}},"corpus_meta":[{"pmid":"19531803","id":"PMC_19531803","title":"Suppression of 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communications","url":"https://pubmed.ncbi.nlm.nih.gov/41501053","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":20880,"output_tokens":6748,"usd":0.08193,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15875,"output_tokens":5878,"usd":0.113162,"stage2_stop_reason":"end_turn"},"total_usd":0.195092,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"AKAP95 is localized to the nucleus in interphase cells, while RIIα is excluded from the nucleus; during mitosis, AKAP95 redistributes and co-localizes with RIIα outside the metaphase plate, and RIIα is co-immunoprecipitated with AKAP95 from mitotic but not interphase HeLa cells, demonstrating a cell cycle-dependent physical association.\",\n      \"method\": \"Immunofluorescence microscopy, co-immunoprecipitation from synchronized HeLa cells\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with cell-cycle synchronization, replicated in subsequent studies\",\n      \"pmids\": [\"9473338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AKAP95 associates with the nuclear matrix in interphase and redistributes to chromatin at mitosis; intranuclear immunoblocking of AKAP95 inhibits chromosome condensation in a PKA-independent manner; depletion of AKAP95 from mitotic extract causes premature chromatin decondensation; maintenance of condensed chromatin requires PKA binding to chromatin-associated AKAP95 and cAMP signaling; AKAP95 interacts with Eg7 (hCAP-D2), a component of the condensin complex, and is required for Eg7 recruitment to chromatin.\",\n      \"method\": \"Cell fractionation, in vitro chromosome condensation assay with recombinant AKAP95 fragments, intranuclear immunoblocking, immunodepletion from mitotic extract, co-immunoprecipitation, GST pull-down\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods including reconstitution with recombinant fragments, immunodepletion rescue, and epistasis; replicated in subsequent studies\",\n      \"pmids\": [\"10601332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"AKAP95 acts as a targeting/receptor protein for hCAP-D2/Eg7 (condensin component) to chromosomes; recombinant AKAP95 C-terminal fragment binds chromatin and recruits Eg7 in a concentration-dependent manner correlating with extent of chromosome condensation; GST pull-down data suggest AKAP95 recruits multiple condensin subunits.\",\n      \"method\": \"In vitro chromosome condensation assay, recombinant protein addition/rescue, GST pull-down, immunofluorescence co-localization\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with recombinant protein and concentration-dependent rescue, replicated across two papers\",\n      \"pmids\": [\"10791967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"AKAP95 is targeted to the nuclear matrix via a distinct nuclear matrix-targeting site (separate from DNA- and PKA-binding domains); AKAP95 directly binds isolated nuclear matrix in a targeting-site-dependent manner; AKAP95 interacts with p68 RNA helicase both in vitro and in co-immunoprecipitation from cell extracts, with co-localization in the nuclear matrix.\",\n      \"method\": \"Mutational analysis, in situ nuclear matrix binding, yeast two-hybrid, Far Western blot, co-immunoprecipitation, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (yeast two-hybrid, in vitro binding, Co-IP, mutagenesis) in single study\",\n      \"pmids\": [\"11279182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CDK1 phosphorylates RIIα on threonine 54 (T54) at mitosis, creating a molecular switch that controls RIIα anchoring to chromatin-bound AKAP95; RIIα(T54E) phosphomimetic fails to associate with chromatin-bound AKAP95 at mitosis; disrupting AKAP95-RIIα anchoring promotes premature chromatin decondensation; wild-type RIIα or RIIα(T54D) rescues decondensation in RIIα-deficient cells.\",\n      \"method\": \"Stably transfected RIIα-deficient cell lines with wild-type and point mutants, cell fractionation, in vitro chromatin condensation/decondensation assay, nuclear reconstitution assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis with multiple point mutants, in vitro reconstitution, rescue experiments\",\n      \"pmids\": [\"11591814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"AMY-1 binds to the RII-binding region of AKAP95 in vivo and in vitro, forming a ternary complex with RII; this AMY-1/AKAP95/RII complex prevents the PKA catalytic subunit from binding to the AKAP complex, suppressing PKA activity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assay, PKA activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP plus in vitro binding plus functional PKA assay, single lab\",\n      \"pmids\": [\"12414807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Chromatin binding of AKAP95 is conferred by residues 387–450 and requires zinc finger ZF1; residues 525–569 are essential for condensation activity and condensin recruitment; ZF2 (C-terminal zinc finger) is required for condensin targeting whereas ZF1 is dispensable for this; AKAP95 interacts with Xenopus XCAP-H condensin subunit in vitro and in vivo but not with human hCAP-D2; condensin recruitment to chromatin is not sufficient to promote condensation.\",\n      \"method\": \"Deletion and point mutant analysis, in vitro chromosome condensation assay, GST pull-down, co-immunoprecipitation\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis with functional reconstitution in vitro, single lab\",\n      \"pmids\": [\"11964380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"AKAP95 interacts with MCM2 (a component of the pre-replication complex) via its N-terminal residues 1–195; disrupting the AKAP95-MCM2 interaction inside HeLa nuclei abolishes initiation of DNA replication in G1 and elongation phase in vitro; depletion of AKAP95 from nuclei partially depletes MCM2 and abolishes replication; recombinant AKAP95 restores intranuclear MCM2 and replication in a dose-dependent manner.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation from chromatin, intranuclear peptide disruption, in vitro DNA replication assay, recombinant protein rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with recombinant protein, dose-dependent rescue, multiple orthogonal methods\",\n      \"pmids\": [\"12740381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"AKAP95 physically interacts with all three D-type cyclins (D1, D2, D3) but not with CDK4 or p27kip1; CDK4 displaces the cyclin D3–AKAP95 interaction; endogenous interactions confirmed in thyrocytes, human fibroblasts, and NIH-3T3 cells.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation from multiple cell types, co-transfection\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid validated by Co-IP across multiple cell lines, single lab\",\n      \"pmids\": [\"14641107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AKAP95 binds cyclin E1, and G1/S cyclins (D and E) can interact with the RIIα subunit of PKA through AKAP95; CDKs displace cyclins from AKAP95, suggesting distinct cyclin–CDK vs. cyclin–AKAP95–PKA complexes.\",\n      \"method\": \"Co-immunoprecipitation, competition assay with CDKs\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP with competition assay, consistent with prior D-cyclin findings, single lab\",\n      \"pmids\": [\"16721056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Fidgetin (an AAA ATPase) physically interacts with AKAP95 in the nuclear matrix; genetic interaction between fidgetin and AKAP95 is required for palatogenesis in mice — double mutants (fidget + Akap95 gene-trap) exhibit cleft palate lethality not seen in single mutants.\",\n      \"method\": \"Yeast two-hybrid, co-immunofluorescence, reciprocal co-immunoprecipitation, genetic epistasis in mice (gene trap + existing mutant)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, co-localization, and in vivo genetic epistasis\",\n      \"pmids\": [\"16751186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PKA anchored via AKAP95 suppresses LPS-induced TNF-α production in macrophages; AKAP95-anchored PKA phosphorylates p105 (NF-κB1) at a site adjacent to the IKK target region, thereby suppressing TNFα gene expression downstream of TLR4.\",\n      \"method\": \"Multigene RNAi screening, selective PKA-anchoring inhibitors, time-lapse microscopy, cAMP analog treatment\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi knockdown with specific anchoring inhibitors and identified phosphorylation substrate, single lab\",\n      \"pmids\": [\"19531803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AKAP95 physically and functionally associates with MLL1 and MLL2 histone methyltransferase complexes; AKAP95 directly enhances MLL2 H3K4 methyltransferase activity in a cell-free chromatin transcription system; ectopic AKAP95 stimulates chromosomal reporter gene expression in synergy with MLL1 or MLL2; AKAP95 depletion impairs retinoic acid-mediated gene induction in embryonic stem cells.\",\n      \"method\": \"Biochemical purification, in vitro H3K4 methylation assay, cell-free chromatin transcription assay, co-immunoprecipitation, siRNA knockdown with reporter assay\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay reconstitution plus co-IP plus cell-based functional assay, single rigorous study\",\n      \"pmids\": [\"23995757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Tyrosine phosphorylation of AKAP8 by nuclear tyrosine kinases (Src, Fyn, c-Abl, nucleus-targeted Lyn/c-Src) dissociates AKAP8 from chromatin and the nuclear matrix; substitution of multiple AKAP8 tyrosines to phenylalanine inhibits its dissociation from nuclear structures and suppresses kinase-induced chromatin structural changes; AKAP8 knockdown increases chromatin structural changes; hydrogen peroxide induces chromatin structural changes accompanied by AKAP8 dissociation.\",\n      \"method\": \"Phosphorylation assays, tyrosine-to-phenylalanine mutagenesis, cell fractionation, chromatin structural change assay, RNAi knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis with functional readout plus fractionation and KD, multiple orthogonal approaches in single study\",\n      \"pmids\": [\"25770215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AKAP95 interacts with hnRNP H/F and U proteins through its N-terminal region, and directly binds preferentially to proximal intronic regions on pre-mRNAs via its zinc-finger domains to promote exon inclusion; AKAP95 also interacts with itself (self-association); AKAP95 is established as a regulator of pre-mRNA splicing and a potential integrator of transcription and splicing.\",\n      \"method\": \"RNA immunoprecipitation (RIP), CLIP-seq/transcriptome-wide analysis, co-immunoprecipitation, RNA splicing assays, RNAi knockdown\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide RNA binding data plus Co-IP of protein partners plus functional splicing assays, multiple orthogonal methods\",\n      \"pmids\": [\"27824034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A subpopulation of AKAP95 localizes to the nucleolus during interphase, associates with ribosomal chromatin (ChIP), co-localizes with upstream binding factor (UBF), binds GC-rich DNA in vitro (SELEX), and is a highly mobile protein by FRAP; AKAP95 expression reciprocally regulates 47S rRNA production — AKAP95 is a regulator of ribosomal RNA synthesis.\",\n      \"method\": \"ChIP, SELEX, FRAP, immunofluorescence co-localization, siRNA knockdown with rRNA quantification\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (ChIP, FRAP, SELEX, knockdown with functional readout) in single lab study\",\n      \"pmids\": [\"26683827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AKAP95 and Cx43 dynamically interact during cell cycle progression; Cx43 translocates to the nucleus via AKAP95 in late G1; their interaction is reduced by PKA inhibitor H89 and enhanced by forskolin, implicating PKA signaling in the interaction.\",\n      \"method\": \"Co-immunoprecipitation, tandem mass spectrometry, confocal immunofluorescence, Western blot\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP validated by MS and imaging across cell cycle phases, single lab\",\n      \"pmids\": [\"26880274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AKAP95 forms a nuclear signaling complex with PKA and PDE4D5 that controls a local cAMP microdomain; locally generated cAMP accumulates within this complex, but plasma membrane-generated cAMP is prevented from activating nuclear PKA by PDE4 (local sink) and PDE3 (barrier).\",\n      \"method\": \"FRET-based cAMP biosensor (live cell imaging), pharmacological manipulation of PDE activity, co-immunoprecipitation\",\n      \"journal\": \"Cell chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell FRET biosensor with pharmacological dissection, single lab\",\n      \"pmids\": [\"30982750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AKAP95 interacts with nucleoporin TPR specifically in mitosis (identified by BioID proximity screen and confirmed by Co-IP); AKAP95 depletion causes faster prometaphase-to-anaphase transition, escape from nocodazole-induced mitotic arrest, formation of micronuclei from lagging chromosomes, and partial delocalization of the spindle assembly checkpoint component MAD1 from kinetochores; AKAP95 is required for proper spindle assembly checkpoint function.\",\n      \"method\": \"BioID proximity labeling proteomics, co-immunoprecipitation, RNAi depletion with mitotic timing assays, immunofluorescence for MAD1 kinetochore localization, nocodazole arrest assay\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BioID plus Co-IP plus functional KD phenotypes, single lab\",\n      \"pmids\": [\"28379780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AKAP95-anchored nuclear PKA is required for cortisol-induced PTGS2 (COX-2) expression in human amnion fibroblasts; cortisol increases AKAP95 expression, expanding the nuclear PKA pool; AKAP95 knockdown reduces nuclear PKA and phospho-CREB, attenuating cortisol-induced PTGS2 expression without affecting STAT3 phosphorylation.\",\n      \"method\": \"siRNA knockdown in primary human amnion fibroblasts, Western blot for nuclear PKA/phospho-CREB/COX-2, qRT-PCR for PTGS2, human tissue analysis (amnion after labor vs. cesarean section)\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific KD with defined molecular and functional readouts, validated in human tissue, single lab\",\n      \"pmids\": [\"29162743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The PKA-binding domain of AKAP8 is essential for direct interaction with DPY30 (core subunit of H3K4 HMT complexes); a single L69D substitution in DPY30 abolishes its dimerization and interaction with both AKAP8 and BIG1; AKAP8 interacts with DPY30 and RIIα in both interphase and mitotic cells.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding with domain mutants, point mutagenesis (L69D DPY30), cell cycle-synchronized binding assays\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus Co-IP across cell cycle phases, single lab\",\n      \"pmids\": [\"29288530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AKAP95 forms phase-separated, liquid-like condensates in vitro and in the nucleus; condensate formation is required for its splicing regulatory activity; hardening of condensates significantly impairs splice regulation; substitution of the condensation-mediating region with unrelated condensation-mediating sequences restores activity; AKAP95 condensates are required for supporting cancer cell growth and suppressing oncogene-induced senescence.\",\n      \"method\": \"In vitro phase separation assay, FRAP (fluorescence recovery after photobleaching), condensate-disrupting/hardening mutations, chimeric protein rescue, splicing reporter assays, cell growth and senescence assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in vitro plus mutagenesis with functional rescue plus multiple cellular readouts, rigorous single study\",\n      \"pmids\": [\"32719551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AKAP8 inhibits hnRNPM splicing activity through direct protein-protein interaction, and directly binds RNA to alter splicing outcomes; AKAP8 promotes an epithelial-cell-state splicing program genome-wide; AKAP8 loss promotes EMT-associated alternative splicing and breast cancer metastasis; CLSTN1 is an AKAP8 splicing target whose isoform switch is crucial for EMT.\",\n      \"method\": \"Co-immunoprecipitation (AKAP8-hnRNPM interaction), RNA binding assays, RNA-seq/splicing analysis, shRNA knockdown, metastasis assays in vivo, CLSTN1 isoform manipulation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of protein interaction, RNA binding, genome-wide splicing analysis, and in vivo functional readout\",\n      \"pmids\": [\"31980632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AKAP8 is secreted by FBXW7 mutant colorectal cancer cells and induces DNA damage in neighboring wildtype cells; overexpression of AKAP8 in wildtype cells recapitulates the DNA damage phenotype; co-culture with double-mutant FBXW7-/-/AKAP8-/- cells abrogates this paracrine DNA damage.\",\n      \"method\": \"CRISPR-Cas9 knockout, Transwell co-culture, mass spectrometry (identification of secreted AKAP8), AKAP8 overexpression, AKAP8/FBXW7 double knockout\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout rescue experiment plus overexpression phenocopy, single lab\",\n      \"pmids\": [\"37386001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AKAP8 is enriched at chromatin and regulates transcription of a specific short isoform of hnRNPUL1 through phase separation; ectopic expression of the hnRNPUL1 short isoform partially rescues growth inhibition caused by AKAP8 knockdown; AKAP8 modulates PARP1 expression through hnRNPUL1, and AKAP8 inhibition enhances PARP inhibitor cytotoxicity.\",\n      \"method\": \"ChIP, RNA-seq, siRNA knockdown, overexpression rescue, PARP inhibitor sensitivity assay, phase separation assay\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus transcription assay plus rescue experiment plus pharmacological readout, single lab\",\n      \"pmids\": [\"38711442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"AKAP95 phase separation and RNA binding properties modulate RNA Pol II recruitment into transcriptional condensates at genome-wide target sites; AKAP95 interacts with MLL1 translocated fragment (MLL-AF9), and partial co-condensation leads to stronger AKAP95 binding at MLL-AF9 target genes; loss of AKAP95 downregulates MLL-AF9 target gene expression and impairs MLL-AF9-driven leukemogenesis; a peptide (JD-PI95) bridging AKAP95 to HSP70 impairs AKAP95 phase separation and attenuates gene transcription.\",\n      \"method\": \"ChIP-seq, RNA-seq, CRISPR knockout, co-immunoprecipitation, in vitro phase separation, peptide design and functional assay, leukemogenesis assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide ChIP-seq plus reconstitution of phase separation plus genetic KO with functional rescue and therapeutic peptide validation, multiple orthogonal methods\",\n      \"pmids\": [\"41501053\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AKAP8/AKAP95 is a multifunctional nuclear scaffold protein that anchors PKA (via RIIα binding) to specific nuclear substrates including chromatin at mitosis, recruits condensin (via hCAP-D2/Eg7 and XCAP-H) to drive chromosome condensation, interacts with MCM2 to support DNA replication initiation, associates with MLL1/MLL2 complexes to enhance H3K4 methylation and transcription, regulates pre-mRNA splicing by directly binding intronic RNA and scaffolding hnRNP proteins, forms liquid-like phase-separated condensates whose proper biophysical properties are required for splicing and transcriptional regulation, controls a nuclear cAMP microdomain together with PDE4D5, is regulated by CDK1-mediated T54 phosphorylation of RIIα (controlling mitotic chromatin association) and by nuclear tyrosine kinases (Src/Fyn/c-Abl-mediated phosphorylation dissociating it from chromatin), and is required for proper spindle assembly checkpoint function through interaction with nucleoporin TPR.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AKAP8 (AKAP95) is a nuclear matrix scaffold protein that organizes cell-cycle-dependent signaling and chromatin events by anchoring protein kinase A (PKA) and recruiting effector machinery to defined nuclear substrates [#0, #1]. It is nuclear in interphase and redistributes to chromatin at mitosis, where it captures the PKA RII\\u03b1 subunit through a CDK1-controlled molecular switch: CDK1 phosphorylation of RII\\u03b1 at T54 governs RII\\u03b1 anchoring to chromatin-bound AKAP8, and disrupting this anchoring drives premature chromatin decondensation [#0, #4]. At mitosis AKAP8 acts as a chromatin receptor that recruits the condensin complex (via hCAP-D2/Eg7 and XCAP-H) to promote chromosome condensation, using distinct chromatin-binding and condensin-targeting zinc-finger regions [#1, #2, #6]. In interphase it interacts with MCM2 to support initiation of DNA replication [#7] and associates with MLL1/MLL2 H3K4 methyltransferase complexes\\u2014binding the core subunit DPY30\\u2014to enhance H3K4 methylation and stimulate transcription [#12, #20]. AKAP8 is also a pre-mRNA splicing regulator that binds proximal intronic RNA through its zinc fingers and scaffolds hnRNP H/F/U proteins to control exon inclusion, inhibiting hnRNPM to enforce an epithelial splicing program whose loss promotes EMT and breast cancer metastasis [#14, #22]. These chromatin and RNA functions depend on AKAP8 forming liquid-like phase-separated condensates: condensate integrity is required for splicing regulation, for recruiting RNA Pol II into transcriptional condensates, and for cancer cell growth, and pharmacological disruption of phase separation attenuates MLL-AF9-driven leukemogenesis [#21, #25]. AKAP8 chromatin association is dynamically released by nuclear tyrosine kinase (Src/Fyn/c-Abl) phosphorylation, linking it to chromatin structural remodeling [#13]. Beyond anchoring PKA, AKAP8 organizes a nuclear cAMP microdomain together with PDE4D5 [#17] and is required for proper spindle assembly checkpoint function via interaction with the nucleoporin TPR [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established that AKAP8 anchors PKA in a cell-cycle-dependent manner, defining it as a nuclear A-kinase anchoring protein rather than a constitutive PKA scaffold.\",\n      \"evidence\": \"Immunofluorescence and reciprocal Co-IP from synchronized HeLa cells showing mitosis-specific RII\\u03b1 association\",\n      \"pmids\": [\"9473338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the chromatin substrate or downstream consequence of mitotic PKA anchoring\", \"Mechanism of cell-cycle-dependent redistribution unresolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Answered what AKAP8 does at mitosis by showing it is required for chromosome condensation and recruits condensin to chromatin, separating a structural role from PKA anchoring.\",\n      \"evidence\": \"In vitro condensation assays, immunodepletion/rescue from mitotic extract, intranuclear immunoblocking, and Co-IP with Eg7/hCAP-D2\",\n      \"pmids\": [\"10601332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map the domains required for chromatin vs condensin binding\", \"Relationship between PKA-dependent and PKA-independent condensation roles unclear\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined AKAP8 as a concentration-dependent chromatin receptor for condensin, linking the amount of recruited condensin to the extent of condensation.\",\n      \"evidence\": \"Recombinant C-terminal fragment addition with dose-dependent rescue and GST pull-down of condensin subunits\",\n      \"pmids\": [\"10791967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether recruitment alone or additional activity drives condensation not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Resolved the modular architecture and the mitotic switch: a nuclear-matrix-targeting site distinct from DNA/PKA domains, and CDK1 phosphorylation of RII\\u03b1 T54 controlling anchoring to chromatin.\",\n      \"evidence\": \"Mutational/nuclear-matrix binding analysis plus RII\\u03b1 phosphomimetic point mutants with reconstitution and rescue; identification of p68 RNA helicase partner\",\n      \"pmids\": [\"11279182\", \"11591814\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How tethering RII\\u03b1 mechanistically maintains condensation not defined\", \"Functional role of p68 helicase interaction not pursued\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Dissected the zinc-finger requirements (ZF1 for chromatin binding, ZF2 for condensin targeting) and showed condensin recruitment is necessary but not sufficient for condensation.\",\n      \"evidence\": \"Systematic deletion/point mutagenesis with in vitro condensation assays and XCAP-H pull-downs; AMY-1 ternary complex suppressing PKA activity\",\n      \"pmids\": [\"11964380\", \"12414807\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The additional step beyond recruitment needed for condensation unidentified\", \"AMY-1 regulatory mechanism shown in single lab\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Extended AKAP8 function into S phase by showing its N-terminal interaction with MCM2 is required for DNA replication initiation and elongation.\",\n      \"evidence\": \"Yeast two-hybrid, intranuclear peptide disruption, in vitro replication assay, and dose-dependent recombinant rescue\",\n      \"pmids\": [\"12740381\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AKAP8 mechanistically promotes MCM2 chromatin retention not defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected AKAP8 to cell-cycle cyclin regulation by showing direct binding to D- and E-type cyclins displaced by CDKs, defining cyclin\\u2013AKAP8\\u2013PKA versus cyclin\\u2013CDK pools.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP across multiple cell types, and CDK competition assays\",\n      \"pmids\": [\"14641107\", \"16721056\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of cyclin sequestration on cell-cycle progression untested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed organismal and inflammatory roles: a genetic interaction with fidgetin required for palatogenesis, and AKAP8-anchored PKA suppressing TLR4-driven TNF\\u03b1.\",\n      \"evidence\": \"In vivo mouse genetic epistasis with reciprocal Co-IP; RNAi screening with anchoring inhibitors and p105 phosphorylation analysis\",\n      \"pmids\": [\"16751186\", \"19531803\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the fidgetin-AKAP8 developmental requirement unclear\", \"TNF\\u03b1 phosphorylation findings from a single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established AKAP8 as a positive transcriptional/epigenetic regulator by showing it associates with and directly enhances MLL1/MLL2 H3K4 methyltransferase activity.\",\n      \"evidence\": \"Biochemical purification, in vitro H3K4 methylation and chromatin transcription assays, Co-IP, and reporter assays in ES cells\",\n      \"pmids\": [\"23995757\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct subunit contact within the MLL complex not yet defined (resolved later as DPY30)\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified tyrosine phosphorylation by Src/Fyn/c-Abl as a regulatory switch that dissociates AKAP8 from chromatin and drives chromatin structural changes.\",\n      \"evidence\": \"Phosphorylation assays, tyrosine-to-phenylalanine mutagenesis, cell fractionation, and RNAi with chromatin structural readouts\",\n      \"pmids\": [\"25770215\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific tyrosines are physiologically targeted not pinpointed\", \"Link to oxidative-stress signaling correlative\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined AKAP8 as a direct pre-mRNA splicing regulator and rRNA synthesis modulator, broadening its role beyond chromatin to RNA metabolism.\",\n      \"evidence\": \"CLIP-seq/RIP showing intronic RNA binding and hnRNP H/F/U interactions; ChIP, SELEX, and FRAP at the nucleolus with rRNA quantification; Cx43 nuclear translocation Co-IP/MS\",\n      \"pmids\": [\"27824034\", \"26683827\", \"26880274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RNA binding and chromatin functions are coordinated not resolved\", \"rRNA and Cx43 findings from single labs\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Refined the nuclear PKA module by defining an AKAP8\\u2013PKA\\u2013PDE4D5 cAMP microdomain, a TPR-dependent spindle checkpoint role, and a CREB-dependent transcriptional output.\",\n      \"evidence\": \"FRET cAMP biosensors with PDE pharmacology; BioID/Co-IP and RNAi mitotic-timing phenotypes; siRNA with nuclear PKA/phospho-CREB readouts validated in human amnion tissue\",\n      \"pmids\": [\"30982750\", \"28379780\", \"29162743\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a single scaffold integrates microdomain, checkpoint, and transcription functions unclear\", \"Each finding from a single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Pinpointed DPY30 as the physical bridge between AKAP8's PKA-binding domain and H3K4 methyltransferase complexes, mechanizing the earlier MLL association.\",\n      \"evidence\": \"Co-IP, domain and L69D point mutagenesis, and cell-cycle-synchronized binding assays\",\n      \"pmids\": [\"29288530\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether DPY30 bridging is required for H3K4 methylation enhancement in vivo not directly tested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed that AKAP8 function depends on liquid-liquid phase separation and that its splicing program enforces an epithelial cell state suppressing EMT and metastasis.\",\n      \"evidence\": \"In vitro phase separation, FRAP, condensate-hardening/chimeric rescue, splicing reporters, and growth/senescence assays; hnRNPM inhibition, RNA-seq, and in vivo metastasis assays with CLSTN1 isoform manipulation\",\n      \"pmids\": [\"32719551\", \"31980632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The endogenous sequence determinants of condensation only partially defined\", \"Direct mechanistic link between condensate biophysics and specific splicing decisions incomplete\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Uncovered a paracrine function in which AKAP8 secreted by FBXW7-mutant cancer cells induces DNA damage in neighboring cells.\",\n      \"evidence\": \"CRISPR knockout, Transwell co-culture, mass spectrometry identification of secreted AKAP8, and double-knockout abrogation\",\n      \"pmids\": [\"37386001\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of AKAP8 secretion and the receptor/pathway driving DNA damage unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked AKAP8 phase separation to a specific transcriptional output controlling PARP1 levels via an hnRNPUL1 short isoform, defining a PARP-inhibitor sensitivity axis.\",\n      \"evidence\": \"ChIP, RNA-seq, knockdown/rescue, phase separation assays, and PARP inhibitor cytotoxicity assays\",\n      \"pmids\": [\"38711442\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How AKAP8 condensates select the hnRNPUL1 short isoform mechanistically unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established that AKAP8 phase separation and RNA binding recruit RNA Pol II into transcriptional condensates and co-condense with MLL-AF9 to sustain leukemogenesis, validating a therapeutic phase-separation-disrupting peptide.\",\n      \"evidence\": \"ChIP-seq, RNA-seq, CRISPR knockout, in vitro phase separation, Co-IP, and JD-PI95 peptide leukemogenesis assays\",\n      \"pmids\": [\"41501053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of condensate-driven Pol II recruitment beyond MLL-AF9 targets not fully mapped\", \"In vivo therapeutic window of JD-PI95 not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AKAP8's diverse activities\\u2014PKA anchoring, condensin recruitment, replication, H3K4 methylation, splicing, and Pol II condensate formation\\u2014are spatiotemporally coordinated by a single phase-separating scaffold remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking condensate biophysics to substrate selection across cell-cycle phases\", \"No structural model of the full-length scaffold with its partners\", \"How post-translational switches (CDK1, tyrosine kinases) globally reprogram its functions unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2, 7, 12, 14]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [14, 22]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [6, 15]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 11, 12]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [12, 24, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [1, 2, 13]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [3, 14, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1, 4, 18]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [14, 22, 24]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [12, 25]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [1, 2, 12, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 17, 19]}\n    ],\n    \"complexes\": [\"condensin\", \"MLL1/MLL2 H3K4 methyltransferase complex\", \"AKAP8-PKA(RII\\u03b1)-PDE4D5 complex\"],\n    \"partners\": [\"PRKAR2A\", \"MCM2\", \"DPY30\", \"HNRNPM\", \"TPR\", \"PDE4D5\", \"CCND3\", \"GJA1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":8,"faith_pct":87.5}}