{"gene":"AKT3","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":1999,"finding":"Human AKT3 contains a regulatory serine phosphorylation site (Ser472) in its C-terminal region that is phosphorylated in response to insulin, indicating it is regulated similarly to AKT1 and AKT2.","method":"In vitro phosphorylation assay, RT-PCR, sequencing","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct phosphorylation assay with insulin stimulation, single lab, two methods (sequencing + phosphorylation assay)","pmids":["10208883"],"is_preprint":false},{"year":1999,"finding":"Human AKT3 encodes a serine/threonine kinase with a pleckstrin homology domain and kinase domain; phosphorylation of both Ser472 and Thr305 contributes to activation, as mutation of both to aspartate increased catalytic activity while alanine substitutions inhibited activation.","method":"Site-directed mutagenesis, in vitro kinase assay","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay combined with site-directed mutagenesis of activation sites, single lab but multiple orthogonal methods","pmids":["10491192"],"is_preprint":false},{"year":1999,"finding":"AKT3 enzymatic activity is stimulated ~7-fold by insulin in 3T3-L1 adipocytes; protein kinase C activation inhibits insulin-stimulated AKT3 activity through a mechanism independent of the pleckstrin homology domain.","method":"In vitro kinase assay, PKC activation/inhibition, PH-domain deletion mutant","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with pharmacological and genetic dissection, single lab","pmids":["9480839"],"is_preprint":false},{"year":1999,"finding":"AKT3 enzymatic activity is elevated 20–60-fold in estrogen receptor-deficient breast cancer cells and androgen-insensitive prostate cancer cells compared to hormone-responsive lines; in PTEN-null prostate cancer cells, AKT3 is constitutively active and represents the major active AKT isoform.","method":"Isoform-specific enzymatic activity assay, RT-PCR, protein quantification","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific kinase assays with multiple cell lines, single lab","pmids":["10419456"],"is_preprint":false},{"year":2004,"finding":"Selective siRNA knockdown of AKT3 (but not AKT1 or AKT2) reduces phosphorylated (active) AKT in melanoma cells and stimulates apoptotic signaling, establishing AKT3 as the predominant active isoform in ~43–60% of nonfamilial melanomas; deregulation occurs via gene copy number increases and PTEN loss.","method":"siRNA isoform-specific knockdown, apoptosis assay, active PTEN expression","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-specific siRNA with functional apoptosis readout, replicated across multiple melanoma lines, two orthogonal perturbation strategies","pmids":["15466193"],"is_preprint":false},{"year":2005,"finding":"Akt3 knockout mice show a selective ~20% reduction in brain size with smaller and fewer cells and attenuated mTOR signaling specifically in the brain, whereas Akt1 knockout reduces cell number; this establishes AKT3 as regulating both cell size and cell number in brain via mTOR.","method":"Genetic knockout mouse model, histology, mTOR signaling analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with specific cellular phenotype, comparison to Akt1-/- controls, replicated in companion paper (PMID:15930105)","pmids":["15713641"],"is_preprint":false},{"year":2005,"finding":"Pkbγ (Akt3)-null mice show ~25% reduction in brain weight with smaller cell size and reduced cell number, predominantly affecting white matter (corpus callosum thinning), without affecting glucose metabolism, confirming an essential isoform-specific role in postnatal brain development.","method":"Genetic knockout mouse model, in vivo MRI, histological analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — independent replication of Akt3-brain phenotype in separate laboratory using MRI and histology","pmids":["15930105"],"is_preprint":false},{"year":2005,"finding":"Akt1−/−Akt3+/− compound mice die within days after birth with defects in thymus, heart, and skin; Akt1−/−Akt3−/− double knockouts are embryonic lethal ~E11-12 with severe cardiovascular and nervous system defects and increased brain apoptosis, demonstrating dosage-dependent and isoform-specific roles.","method":"Compound knockout mouse genetics, histology, apoptosis staining","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with graded allele combinations showing clear dosage dependence, multiple phenotypic endpoints","pmids":["16287854"],"is_preprint":false},{"year":2005,"finding":"Cardiac-specific overexpression of a constitutively active AKT3 splice variant (lacking the C-terminal regulatory phosphorylation site) causes marked cardiac hypertrophy that progresses from adaptive to maladaptive with age; endogenous Akt1 and Akt2 protein levels are downregulated in Akt3 transgenic hearts, indicating negative feedback regulation of Akt signaling.","method":"Cardiac-specific transgenic mouse, echocardiography, western blot","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic model with functional cardiac measurements, single lab","pmids":["15698844"],"is_preprint":false},{"year":2008,"finding":"An AKT3 E17K mutation, analogous to the activating AKT1 E17K mutation, was identified in melanoma specimens and cell lines; expression of AKT3 E17K in human melanoma cells results in activation of AKT3, establishing this as the first activating AKT3 mutation in cancer.","method":"Sequencing of clinical specimens, functional expression in cell lines","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutation identification plus functional validation by expression in cells, single lab","pmids":["18813315"],"is_preprint":false},{"year":2008,"finding":"Active AKT3 phosphorylates V600E B-RAF at Ser364 and Ser428, reducing its kinase activity and downstream MAPK signaling to levels that promote rather than inhibit melanocyte proliferation, thereby cooperating with V600E B-RAF to drive early melanoma development.","method":"Site-specific phosphorylation assay, kinase activity assays, anchorage-independent growth assay, melanocyte transformation","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct phosphorylation site identification with functional consequence demonstrated in cell-based and transformation assays, single lab with multiple methods","pmids":["18451171"],"is_preprint":false},{"year":2010,"finding":"Constitutively active AKT3 protects mutant B-RAF melanoma cells from apoptosis induced by B-RAF knockdown or inhibition (PLX4720) in 3D collagen by preventing upregulation of BH3-only proteins Bim-EL and Bmf and partially protecting Mcl-1-depleted cells.","method":"siRNA knockdown, 3D collagen culture, apoptosis assay, ectopic expression of constitutively active AKT3","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with apoptosis pathway readouts, single lab","pmids":["20647317"],"is_preprint":false},{"year":2010,"finding":"A missense mutation in the Akt3 kinase domain (Nmf350) confers higher enzymatic activity in vitro and causes brain enlargement and seizures in mice, with increased phosphorylation of ribosomal protein S6 in the dentate gyrus; Akt3 null mice show elevated seizure threshold, opposite to Akt3(Nmf350).","method":"In vitro kinase assay, EEG, immunohistochemistry, genetic mouse model","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay demonstrating gain-of-function, combined with in vivo phenotypic characterization and comparison to null mice","pmids":["21159799"],"is_preprint":false},{"year":2012,"finding":"Akt3 deficiency in macrophages promotes foam cell formation and atherosclerosis; mechanistically, Akt3 suppresses foam cell formation by reducing lipoprotein uptake and promoting ACAT-1 degradation via the ubiquitin-proteasome pathway; Akt1 and Akt3 show differential subcellular localization in macrophages.","method":"Akt3 knockout mouse crossed to ApoE-/-, macrophage cholesterol accumulation assay, ACAT-1 degradation assay, subcellular fractionation","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO model with mechanistic dissection of two distinct pathways (lipoprotein uptake and ACAT-1 proteasomal degradation) using multiple in vitro methods","pmids":["22632897"],"is_preprint":false},{"year":2013,"finding":"AKT3 controls mitochondrial biogenesis and PGC-1α subcellular localization in endothelial cells by stabilizing CRM-1 (the major nuclear export receptor); AKT3 knockdown causes CRM-1-dependent nuclear export of PGC-1α, ~3-fold reduction in PGC-1α target gene expression, and autophagy induction in a CRM-1-dependent, Akt1/mTOR-independent manner; Akt3-null mice show dose-dependent decreases in angiogenesis.","method":"Site-directed mutagenesis, CRM-1 overexpression, siRNA knockdown, autophagosome assay, Matrigel plug angiogenesis in vivo","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis plus association analyses plus multiple orthogonal knockdown/overexpression strategies plus in vivo validation","pmids":["24081905"],"is_preprint":false},{"year":2013,"finding":"AKT3 silencing, but not AKT1 or AKT2, markedly upregulates p27 cell-cycle inhibitor and inhibits growth of triple-negative breast cancer (TNBC) cells in 3D spheroid cultures and xenograft models; AKT3 does not promote invasion unlike AKT1.","method":"shRNA screen, 3D spheroid culture, mouse xenograft, p27 protein analysis","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-specific shRNA with mechanistic readout (p27), validated in both in vitro and in vivo models","pmids":["24335962"],"is_preprint":false},{"year":2013,"finding":"AKT3 controls VEGF secretion in ovarian cancer cells by regulating expression of the Golgi protein RCAS1; blockade of AKT3 (but not AKT1) reduces RCAS1 expression, retains VEGF in the endoplasmic reticulum, and reduces tumor vascularization in xenografts.","method":"shRNA knockdown, AKT3 overexpression, VEGF secretion assay, RCAS1 siRNA, xenograft mouse model","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific knockdown with mechanistic pathway (RCAS1/VEGF secretion) validated by rescue experiments, single lab","pmids":["21351097"],"is_preprint":false},{"year":2014,"finding":"AKT3 knockdown in ErbB2+ breast cancer cells reduces ErbB2 and ErbB3 expression and tyrosine phosphorylation, while strongly upregulating ERα expression through decreased phosphorylation of the AKT substrate FOXO3a; AKT3-specific kinase activity (not AKT1 or AKT2) is detected in ErbB2+ and triple-negative tumors.","method":"AKT isoform-specific in vitro kinase assay, isoform-specific siRNA knockdown, western blot for ErbB2/ErbB3/ERα/Foxo3a","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific kinase assay combined with siRNA mechanistic dissection, single lab","pmids":["24463007"],"is_preprint":false},{"year":2014,"finding":"An AKT3-FOXG1-reelin signaling pathway underlies focal malformations of cortical development (FMCD): AKT3(E17K) mutation in neural progenitors causes FOXG1-dependent derepression of reelin transcription, leading to non-cell-autonomous migration defects in neighboring cells; blocking AKT signaling or inactivating reelin restores migration.","method":"In utero electroporation in mouse, immunoprecipitation, pathway inhibition, reelin functional rescue","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse brain model with cell-autonomous vs. non-cell-autonomous dissection, pharmacological and genetic rescue, multiple orthogonal methods","pmids":["26523971"],"is_preprint":false},{"year":2015,"finding":"Genomically amplified Akt3, but not Akt1, drives progression to high-grade glioma in a mouse model; Akt3-expressing glioma cells show dominant activation of DNA repair pathways, enhanced DNA repair protein activation, and increased resistance to radiation and temozolomide compared to Akt1/Akt2.","method":"RCAS/Ntv-a mouse glioma model, gene expression profiling, DNA repair assays, irradiation/drug resistance assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse model with isoform comparisons, gene expression profiling, and functional DNA repair assays in human GBM cells","pmids":["25737557"],"is_preprint":false},{"year":2014,"finding":"AKT3 downregulation in triple-negative breast cancer (MDA-MB-231) cells increases migration in vitro and combined AKT2/3 or AKT1/3 knockdown significantly increases metastasis formation in vivo; AKT3 depletion increases S100A4 protein, and S100A4 silencing reverses the increased migration.","method":"Isoform-specific shRNA knockdown, live cell imaging, transwell migration, xenograft metastasis model, S100A4 siRNA rescue","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific shRNA with in vivo metastasis readout and mechanistic rescue, single lab","pmids":["26741489"],"is_preprint":false},{"year":2015,"finding":"Akt3 deficiency impairs hippocampal CA1 protein synthesis-dependent long-LTP and long-term spatial memory via inactivation of mTOR; Akt3-KO mice show reduced basal mTOR phosphorylation and failure to activate mTOR-p70S6K-4EBP2-eIF4E signaling cascade and AMPA receptor upregulation after HFS.","method":"Akt3 knockout mouse, Morris water maze, electrophysiology (LTP), western blot for mTOR pathway","journal":"Acta physiologica (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with mechanistic pathway dissection by electrophysiology and biochemistry, single lab","pmids":["30053339"],"is_preprint":false},{"year":2017,"finding":"AKT3 is a first-responding isoform that preferentially senses native electrophilic lipids (4-hydroxynonenal); electrophile modification occurs at Cys119, and an AKT3 C119S mutant is hypomorphic for all downstream phenotypes, establishing C119 as the privileged electrophile-sensing cysteine distinct from Akt2 oxidative regulation.","method":"Redox-targeting screen, digest MS sequencing of modified cysteine, C119S mutagenesis, zebrafish in vivo validation","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — MS-identified modification site, mutagenesis confirming functional requirement, validated in cells and in vivo (zebrafish), multiple orthogonal methods","pmids":["28114274"],"is_preprint":false},{"year":2017,"finding":"Akt3 specifically phosphorylates WNK1 at T58 and promotes its degradation via the ubiquitin-proteasome pathway; loss of Akt3 in adipocytes increases WNK1, activates SGK1, which phosphorylates/inhibits FOXO1 and activates PPARγ transcription to promote adipogenesis.","method":"Site-specific phosphorylation assay (T58), ubiquitin-proteasome pathway analysis, Akt3 KO mouse on high-fat diet, SGK1 pharmacological inhibition rescue","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1 / Strong — identified phosphorylation site on WNK1, mechanistic cascade validated by multiple genetic and pharmacological interventions in vitro and in vivo","pmids":["29202451"],"is_preprint":false},{"year":2017,"finding":"Akt3 suppresses macropinocytosis of LDL in macrophages through a WNK1/SGK1/Cdc42 pathway: Akt3 deficiency increases WNK1 expression → SGK1 activity → Cdc42 expression, promoting actin assembly and pinocytosis; individual suppression of WNK1, SGK1, or Cdc42 in Akt3-deficient macrophages rescues the phenotype.","method":"siRNA knockdown of WNK1/SGK1/Cdc42, fluid-phase pinocytosis assay, murine and human macrophages","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic cascade dissected by stepwise rescue experiments in two macrophage systems (murine and human), multiple orthogonal suppression strategies","pmids":["28389565"],"is_preprint":false},{"year":2017,"finding":"AKT3 (but not AKT1 or AKT3) deletion impairs cortical Akt Ser473 phosphorylation in an allele-dose dependent manner and reduces mTORC2 complex proteins Rictor and Sin1, indicating AKT3 is the dominant regulator of AKT/mTOR signaling in brain.","method":"Akt3 heterozygous and null mouse model, western blot for Ser473-pAkt, Rictor, Sin1, behavioral testing battery","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic model with pathway protein quantification, single lab, correlative mechanism for mTORC2 link","pmids":["28467426"],"is_preprint":false},{"year":2017,"finding":"Akt1 and Akt3 (but not Akt2) physically interact with DNA-PKcs and stimulate repair of ionizing radiation-induced DNA double-strand breaks in K-RAS-mutated cancer cells; Akt1 preferentially binds the N-terminal domain of DNA-PKcs while Akt3 interacts with all domains without preference; Akt1 activity correlates with Akt1/DNA-PKcs complex formation.","method":"Pull-down with eGFP-tagged DNA-PKcs fragments, mCherry-tagged Akt isoforms, clonogenic survival, DSB repair assays, xenograft tumor growth","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal pull-down with domain mapping, functional repair assays, single lab","pmids":["29090098"],"is_preprint":false},{"year":2017,"finding":"Akt3 deletion in mice is associated with reduced phosphorylation of GSK3α/β at Ser21/9 in multiple brain regions without affecting Akt1 or Akt2 levels; chronic lithium treatment restores pGSK3α/β levels and rescues depressive and anxiety-like behaviors in Akt3 KO mice.","method":"Akt3 knockout mouse, behavioral battery, western blot for pGSK3α/β, lithium pharmacological rescue","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with pathway biochemistry and pharmacological rescue in vivo, single lab","pmids":["28442992"],"is_preprint":false},{"year":2017,"finding":"Akt3 (but not Akt1 or Akt2) is required for survival and proliferation of mouse embryonic stem cells (ESCs) in a kinase activity-dependent manner; Akt3 depletion leads to G1 cell cycle arrest and nuclear accumulation of p53 with activation of downstream targets (Mdm2, p21, Fas); inhibiting p53 partially rescues Akt3-depletion effects.","method":"Isoform-specific inhibition and siRNA in ESCs, kinase-dead mutant, flow cytometry, p53 nuclear fractionation, p53 inhibitor rescue","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase-dead mutant plus siRNA with mechanistic p53 pathway dissection, single lab","pmids":["28483982"],"is_preprint":false},{"year":2019,"finding":"AKT3 promotes PGC-1α nuclear localization through inhibitory effects on CRM-1 (nuclear export protein), driving mitochondrial biogenesis; PPARG overexpression transcriptionally increases AKT3 levels, which elevates nuclear PGC-1α and increases mitochondrial mass and ATP production in prostate cancer.","method":"AKT3 overexpression/knockdown, PGC-1α subcellular fractionation, CRM-1 interaction analysis, mitochondrial biogenesis assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional validation of PPARG→AKT3→CRM-1→PGC-1α axis with subcellular localization and mitochondrial readouts, single lab","pmids":["33654198"],"is_preprint":false},{"year":2014,"finding":"Akt3 inhibits vascular tumor endothelial cell growth and migration by inhibiting S6-Kinase (S6K) activation through modulation of Rictor expression; S6K in turn acts through a negative feedback loop to restrain Akt3 expression; Akt1 and Akt3 have opposing roles in vascular tumor growth.","method":"Akt isoform-specific manipulation in endothelial cells, S6K activity assay, Rictor expression analysis, S6K inhibitor, tumor growth assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional epistasis between Akt3, Rictor, and S6K with pharmacological validation, single lab","pmids":["25388284"],"is_preprint":false},{"year":2017,"finding":"AKT3 depletion in T cells (but not neurons) impairs differentiation toward FOXP3+ iTregs and worsens clinical course of EAE; Akt3-enhanced kinase activity mice show increased iTreg efficiency and delayed disease onset, establishing AKT3's role in T-cell-mediated neuroprotection.","method":"Conditional Akt3 deletion in CD4+ T-cells (vs. Syn1-CKO in neurons), EAE model, flow cytometry for FOXP3+ Tregs","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific conditional KO with functional disease model comparison, single lab","pmids":["31404142"],"is_preprint":false},{"year":2021,"finding":"AKT3 knockdown in AKT inhibitor (MK2206)-resistant breast cancer cells restores sensitivity to the inhibitor; AKT3 upregulation in resistant cells is regulated epigenetically by bromodomain and extra terminal domain (BET) proteins; AKT3 depletion also diminishes the epithelial-to-mesenchymal transition phenotype in resistant cells.","method":"Step-wise drug resistance model, isoform-specific siRNA, BET inhibitor treatment, EMT marker analysis","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional resistance model with mechanistic epigenetic regulation identified, single lab","pmids":["27297869"],"is_preprint":false},{"year":2015,"finding":"AKT3 promotes prostate cancer cell proliferation by increasing total AKT, phospho-AKT (S473/T308), B-Raf expression, and activating mTOR/p70S6K signaling while decreasing TSC1 and TSC2 expression; AKT3 knockdown sensitizes cells to B-Raf inhibitor.","method":"Plasmid overexpression, siRNA knockdown, western blot for pathway components, drug sensitivity assay","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with multiple pathway readouts, single lab","pmids":["26318033"],"is_preprint":false},{"year":2015,"finding":"Akt3 deficiency in ApoE-/- mice increases atherosclerosis in a macrophage-dependent manner; Akt3 specifically inhibits macrophage cholesteryl ester accumulation and foam cell formation, with Akt1 and Akt3 showing differential subcellular localization in macrophages.","method":"Akt3-/- × ApoE-/- mouse genetics, macrophage transfer experiments, subcellular fractionation, cholesterol assay","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic model with macrophage-specific transfer experiments demonstrating cell-type dependence, subcellular localization data, replicated from original 2012 paper","pmids":["22632897"],"is_preprint":false}],"current_model":"AKT3 (PKBγ/PKBG/RAC-gamma) is a serine/threonine kinase activated by dual phosphorylation at Thr305 and Ser472 (and electrophilic modification at Cys119) that functions as the brain-predominant AKT isoform regulating cell size, number, and mTORC2/mTOR signaling during postnatal brain development; it phosphorylates V600E B-RAF (at Ser364/Ser428) to modulate MAPK signaling in melanoma, controls mitochondrial biogenesis and nuclear export of PGC-1α through CRM-1 stabilization, suppresses macrophage foam cell formation and macropinocytosis via a WNK1/SGK1/Cdc42 pathway, promotes DNA double-strand break repair by interacting with DNA-PKcs, modulates T-cell iTreg differentiation, and drives neural progenitor AKT3(E17K)-FOXG1-reelin signaling to control cortical migration, with its deregulation (via gene amplification or PTEN loss) driving melanoma, glioma, and breast cancer survival and drug resistance."},"narrative":{"mechanistic_narrative":"AKT3 (PKBγ) is a serine/threonine kinase activated by dual phosphorylation at Thr305 and Ser472 that serves as the brain-predominant AKT isoform and a context-specific driver of cell size, survival, and metabolic signaling [PMID:10491192, PMID:15713641]. Its catalytic activity is switched on by insulin and antagonized by PKC through a PH-domain-independent mechanism [PMID:10208883, PMID:9480839], and a distinct layer of regulation operates through direct electrophilic modification of Cys119 by lipid-derived 4-hydroxynonenal, making AKT3 a first-responding redox sensor whose Cys119 is functionally required for downstream phenotypes [PMID:28114274]. In the central nervous system AKT3 is the dominant regulator of AKT/mTOR signaling: its loss reduces brain size, cell number, and cell size with attenuated brain mTOR activity, lowers Ser473-AKT phosphorylation and mTORC2 components Rictor and Sin1, and impairs hippocampal protein-synthesis-dependent long-term potentiation and spatial memory [PMID:15713641, PMID:15930105, PMID:28467426, PMID:30053339]. Gain-of-function in this same axis is pathogenic: a kinase-domain mutation causes brain overgrowth and seizures via elevated S6 phosphorylation [PMID:21159799], and the activating AKT3(E17K) mutation in neural progenitors drives focal malformations of cortical development through a FOXG1-dependent derepression of reelin that perturbs migration of neighboring cells [PMID:26523971]. AKT3 also exerts isoform-specific control over substrates and trafficking: it phosphorylates and degrades WNK1 at Thr58, restraining an SGK1/Cdc42 cascade that otherwise promotes macrophage macropinocytosis, foam-cell formation, and adipogenesis [PMID:29202451, PMID:28389565, PMID:22632897]; it stabilizes nuclear PGC-1α by acting on the export receptor CRM-1 to drive mitochondrial biogenesis [PMID:24081905, PMID:33654198]; and it phosphorylates V600E B-RAF at Ser364/Ser428 to tune MAPK output during melanoma initiation [PMID:18451171]. Across melanoma, glioma, and breast and prostate cancers, AKT3 deregulation through gene amplification, PTEN loss, or the E17K mutation drives survival, proliferation, DNA double-strand break repair via DNA-PKcs, and resistance to BRAF/AKT inhibitors, radiation, and temozolomide [PMID:15466193, PMID:18813315, PMID:25737557, PMID:29090098, PMID:27297869].","teleology":[{"year":1999,"claim":"Establishing how AKT3 is switched on answered whether the third AKT isoform shares the canonical dual-phosphorylation activation logic of AKT1/AKT2.","evidence":"in vitro kinase assays with site-directed mutagenesis of Thr305/Ser472 and insulin/PKC stimulation in adipocytes","pmids":["10491192","10208883","9480839"],"confidence":"High","gaps":["upstream kinase(s) for Thr305/Ser472 not identified","structural basis of PKC-mediated PH-domain-independent inhibition unresolved"]},{"year":1999,"claim":"Linking AKT3 hyperactivity to hormone-independent and PTEN-null cancer cells first implicated it as the dominant active AKT isoform in specific tumor contexts.","evidence":"isoform-specific enzymatic activity assays across breast and prostate cancer cell lines","pmids":["10419456"],"confidence":"Medium","gaps":["correlative activity measurement without functional dependency test","mechanism connecting PTEN loss to selective AKT3 activation unclear"]},{"year":2004,"claim":"Isoform-specific knockdown defined AKT3 as a non-redundant survival driver in melanoma, not just an active isoform.","evidence":"AKT3-selective siRNA with apoptosis readout and PTEN re-expression across melanoma lines","pmids":["15466193"],"confidence":"High","gaps":["downstream survival substrates not defined here","relative contribution of amplification vs PTEN loss not quantified"]},{"year":2005,"claim":"Knockout and compound-allele genetics established AKT3 as the brain-predominant isoform controlling both cell size and number, with dosage-dependent essentiality.","evidence":"Akt3-null and Akt1/Akt3 compound knockout mice with histology, MRI, and brain mTOR analysis","pmids":["15713641","15930105","16287854"],"confidence":"High","gaps":["molecular targets mediating brain mTOR regulation not identified","cell-type origin of size vs number phenotypes not resolved"]},{"year":2008,"claim":"Identification of AKT3(E17K) and direct phosphorylation of V600E B-RAF showed how AKT3 both becomes constitutively active and cross-regulates MAPK signaling in melanoma.","evidence":"clinical specimen sequencing, functional expression, and site-specific B-RAF phosphorylation/transformation assays","pmids":["18813315","18451171"],"confidence":"Medium","gaps":["physiological frequency and in vivo consequence of Ser364/Ser428 B-RAF phosphorylation not established","E17K functional validation in single lab"]},{"year":2010,"claim":"Constitutively active AKT3 was shown to confer apoptosis resistance to BRAF-mutant melanoma, defining a mechanism of BRAF-inhibitor escape.","evidence":"siRNA, PLX4720 treatment, and ectopic active AKT3 in 3D collagen with BH3-only protein readouts","pmids":["20647317"],"confidence":"Medium","gaps":["direct AKT3 substrates controlling Bim-EL/Bmf/Mcl-1 not identified","single-lab apoptosis assays"]},{"year":2010,"claim":"A gain-of-function kinase-domain mutation linked elevated AKT3 catalytic activity to brain overgrowth and epilepsy in vivo.","evidence":"Nmf350 mutant kinase assays, EEG, and S6 phosphorylation immunohistochemistry versus null mice","pmids":["21159799"],"confidence":"High","gaps":["circuit-level basis of seizures not defined","whether S6 hyperphosphorylation is causal vs correlative untested"]},{"year":2012,"claim":"Macrophage genetics revealed AKT3 as an atheroprotective isoform that limits foam-cell formation by promoting ACAT-1 degradation and reducing lipoprotein uptake.","evidence":"Akt3/ApoE double-knockout mice, cholesterol accumulation assays, ACAT-1 degradation, and macrophage transfer","pmids":["22632897"],"confidence":"High","gaps":["direct AKT3 substrate driving ACAT-1 proteasomal turnover not identified","basis of Akt1 vs Akt3 differential localization unknown"]},{"year":2013,"claim":"Work in endothelial and cancer cells defined AKT3 as a controller of organelle trafficking and biogenesis through CRM-1/PGC-1α and RCAS1/VEGF axes.","evidence":"knockdown/overexpression with subcellular fractionation, CRM-1 manipulation, VEGF secretion assays, and in vivo angiogenesis","pmids":["24081905","21351097","33654198"],"confidence":"High","gaps":["whether AKT3 phosphorylates CRM-1 or PGC-1α directly not shown","RCAS1 regulation mechanism downstream of AKT3 incomplete"]},{"year":2013,"claim":"Isoform-resolved knockdown distinguished AKT3 from AKT1 functionally in breast cancer, controlling p27 and proliferation rather than invasion.","evidence":"shRNA screen with 3D spheroid and xenograft growth and p27 analysis","pmids":["24335962"],"confidence":"High","gaps":["mechanism linking AKT3 to p27 upregulation not defined","opposing migration roles of AKT isoforms only partly explained"]},{"year":2014,"claim":"The AKT3-FOXG1-reelin pathway explained how an activating AKT3 mutation produces non-cell-autonomous cortical migration defects underlying focal malformations of cortical development.","evidence":"in utero electroporation of AKT3(E17K), immunoprecipitation, and pharmacological/genetic reelin rescue","pmids":["26523971"],"confidence":"High","gaps":["direct biochemical link between AKT3 and FOXG1 not fully mapped","human genotype-phenotype correlation beyond mouse model not established"]},{"year":2014,"claim":"Migration and metastasis studies showed AKT3 loss can paradoxically increase TNBC cell motility via S100A4, refining its isoform-specific role in tumor progression.","evidence":"isoform-specific shRNA, migration assays, xenograft metastasis, and S100A4 rescue","pmids":["26741489"],"confidence":"Medium","gaps":["mechanism by which AKT3 suppresses S100A4 unknown","single-lab in vivo metastasis data"]},{"year":2014,"claim":"An AKT3-Rictor-S6K feedback circuit was defined, showing AKT3 restrains vascular tumor endothelial growth opposite to AKT1.","evidence":"isoform manipulation in endothelial cells with S6K and Rictor analysis and S6K inhibition","pmids":["25388284"],"confidence":"Medium","gaps":["molecular basis of Rictor modulation by AKT3 not shown","single-lab functional epistasis"]},{"year":2015,"claim":"Amplified AKT3 was shown to drive glioma progression and therapeutic resistance through preferential activation of DNA repair pathways.","evidence":"RCAS/Ntv-a mouse glioma model, expression profiling, and DNA repair/radioresistance assays in human GBM cells","pmids":["25737557"],"confidence":"High","gaps":["direct repair substrates of AKT3 not identified here","isoform-selective therapeutic vulnerability not tested clinically"]},{"year":2015,"claim":"Prostate cancer studies positioned AKT3 as an amplifier of total AKT/mTOR signaling and a determinant of B-Raf inhibitor sensitivity.","evidence":"overexpression/knockdown with pathway western blots and drug sensitivity assays","pmids":["26318033"],"confidence":"Medium","gaps":["mechanism of TSC1/TSC2 downregulation by AKT3 not defined","single-lab correlative pathway data"]},{"year":2016,"claim":"BET-protein-driven epigenetic upregulation of AKT3 was identified as a mechanism of AKT-inhibitor resistance, linking AKT3 to EMT in breast cancer.","evidence":"stepwise MK2206-resistance model, isoform-specific siRNA, BET inhibition, and EMT marker analysis","pmids":["27297869"],"confidence":"Medium","gaps":["direct BET target genes regulating AKT3 not mapped","single-lab resistance model"]},{"year":2017,"claim":"Discovery of Cys119 as a privileged electrophile-sensing residue revealed a redox-dependent activation mode of AKT3 distinct from AKT2 oxidative regulation.","evidence":"redox-targeting screen, MS site identification, C119S mutagenesis, and zebrafish validation","pmids":["28114274"],"confidence":"High","gaps":["physiological electrophile sources in mammalian tissues not defined","structural mechanism of Cys119 activation unresolved"]},{"year":2017,"claim":"Identification of WNK1 Thr58 phosphorylation and the WNK1/SGK1/Cdc42 axis defined how AKT3 suppresses macrophage macropinocytosis and adipogenesis through a specific substrate.","evidence":"site-specific phosphorylation, ubiquitin-proteasome analysis, stepwise rescue of WNK1/SGK1/Cdc42, and Akt3-KO mice on high-fat diet","pmids":["29202451","28389565"],"confidence":"High","gaps":["whether AKT3 directly recognizes WNK1 in vivo across all tissues not shown","interplay with the parallel ACAT-1 pathway not integrated"]},{"year":2017,"claim":"AKT3 was shown to be the dominant brain regulator of AKT/mTORC2 signaling and to control GSK3 phosphorylation, hippocampal LTP, and 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\"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct phosphorylation assay with insulin stimulation, single lab, two methods (sequencing + phosphorylation assay)\",\n      \"pmids\": [\"10208883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human AKT3 encodes a serine/threonine kinase with a pleckstrin homology domain and kinase domain; phosphorylation of both Ser472 and Thr305 contributes to activation, as mutation of both to aspartate increased catalytic activity while alanine substitutions inhibited activation.\",\n      \"method\": \"Site-directed mutagenesis, in vitro kinase assay\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay combined with site-directed mutagenesis of activation sites, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"10491192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AKT3 enzymatic activity is stimulated ~7-fold by insulin in 3T3-L1 adipocytes; protein kinase C activation inhibits insulin-stimulated AKT3 activity through a mechanism independent of the pleckstrin homology domain.\",\n      \"method\": \"In vitro kinase assay, PKC activation/inhibition, PH-domain deletion mutant\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with pharmacological and genetic dissection, single lab\",\n      \"pmids\": [\"9480839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AKT3 enzymatic activity is elevated 20–60-fold in estrogen receptor-deficient breast cancer cells and androgen-insensitive prostate cancer cells compared to hormone-responsive lines; in PTEN-null prostate cancer cells, AKT3 is constitutively active and represents the major active AKT isoform.\",\n      \"method\": \"Isoform-specific enzymatic activity assay, RT-PCR, protein quantification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific kinase assays with multiple cell lines, single lab\",\n      \"pmids\": [\"10419456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Selective siRNA knockdown of AKT3 (but not AKT1 or AKT2) reduces phosphorylated (active) AKT in melanoma cells and stimulates apoptotic signaling, establishing AKT3 as the predominant active isoform in ~43–60% of nonfamilial melanomas; deregulation occurs via gene copy number increases and PTEN loss.\",\n      \"method\": \"siRNA isoform-specific knockdown, apoptosis assay, active PTEN expression\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-specific siRNA with functional apoptosis readout, replicated across multiple melanoma lines, two orthogonal perturbation strategies\",\n      \"pmids\": [\"15466193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Akt3 knockout mice show a selective ~20% reduction in brain size with smaller and fewer cells and attenuated mTOR signaling specifically in the brain, whereas Akt1 knockout reduces cell number; this establishes AKT3 as regulating both cell size and cell number in brain via mTOR.\",\n      \"method\": \"Genetic knockout mouse model, histology, mTOR signaling analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with specific cellular phenotype, comparison to Akt1-/- controls, replicated in companion paper (PMID:15930105)\",\n      \"pmids\": [\"15713641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Pkbγ (Akt3)-null mice show ~25% reduction in brain weight with smaller cell size and reduced cell number, predominantly affecting white matter (corpus callosum thinning), without affecting glucose metabolism, confirming an essential isoform-specific role in postnatal brain development.\",\n      \"method\": \"Genetic knockout mouse model, in vivo MRI, histological analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — independent replication of Akt3-brain phenotype in separate laboratory using MRI and histology\",\n      \"pmids\": [\"15930105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Akt1−/−Akt3+/− compound mice die within days after birth with defects in thymus, heart, and skin; Akt1−/−Akt3−/− double knockouts are embryonic lethal ~E11-12 with severe cardiovascular and nervous system defects and increased brain apoptosis, demonstrating dosage-dependent and isoform-specific roles.\",\n      \"method\": \"Compound knockout mouse genetics, histology, apoptosis staining\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with graded allele combinations showing clear dosage dependence, multiple phenotypic endpoints\",\n      \"pmids\": [\"16287854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cardiac-specific overexpression of a constitutively active AKT3 splice variant (lacking the C-terminal regulatory phosphorylation site) causes marked cardiac hypertrophy that progresses from adaptive to maladaptive with age; endogenous Akt1 and Akt2 protein levels are downregulated in Akt3 transgenic hearts, indicating negative feedback regulation of Akt signaling.\",\n      \"method\": \"Cardiac-specific transgenic mouse, echocardiography, western blot\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic model with functional cardiac measurements, single lab\",\n      \"pmids\": [\"15698844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"An AKT3 E17K mutation, analogous to the activating AKT1 E17K mutation, was identified in melanoma specimens and cell lines; expression of AKT3 E17K in human melanoma cells results in activation of AKT3, establishing this as the first activating AKT3 mutation in cancer.\",\n      \"method\": \"Sequencing of clinical specimens, functional expression in cell lines\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutation identification plus functional validation by expression in cells, single lab\",\n      \"pmids\": [\"18813315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Active AKT3 phosphorylates V600E B-RAF at Ser364 and Ser428, reducing its kinase activity and downstream MAPK signaling to levels that promote rather than inhibit melanocyte proliferation, thereby cooperating with V600E B-RAF to drive early melanoma development.\",\n      \"method\": \"Site-specific phosphorylation assay, kinase activity assays, anchorage-independent growth assay, melanocyte transformation\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct phosphorylation site identification with functional consequence demonstrated in cell-based and transformation assays, single lab with multiple methods\",\n      \"pmids\": [\"18451171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Constitutively active AKT3 protects mutant B-RAF melanoma cells from apoptosis induced by B-RAF knockdown or inhibition (PLX4720) in 3D collagen by preventing upregulation of BH3-only proteins Bim-EL and Bmf and partially protecting Mcl-1-depleted cells.\",\n      \"method\": \"siRNA knockdown, 3D collagen culture, apoptosis assay, ectopic expression of constitutively active AKT3\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with apoptosis pathway readouts, single lab\",\n      \"pmids\": [\"20647317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A missense mutation in the Akt3 kinase domain (Nmf350) confers higher enzymatic activity in vitro and causes brain enlargement and seizures in mice, with increased phosphorylation of ribosomal protein S6 in the dentate gyrus; Akt3 null mice show elevated seizure threshold, opposite to Akt3(Nmf350).\",\n      \"method\": \"In vitro kinase assay, EEG, immunohistochemistry, genetic mouse model\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay demonstrating gain-of-function, combined with in vivo phenotypic characterization and comparison to null mice\",\n      \"pmids\": [\"21159799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Akt3 deficiency in macrophages promotes foam cell formation and atherosclerosis; mechanistically, Akt3 suppresses foam cell formation by reducing lipoprotein uptake and promoting ACAT-1 degradation via the ubiquitin-proteasome pathway; Akt1 and Akt3 show differential subcellular localization in macrophages.\",\n      \"method\": \"Akt3 knockout mouse crossed to ApoE-/-, macrophage cholesterol accumulation assay, ACAT-1 degradation assay, subcellular fractionation\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO model with mechanistic dissection of two distinct pathways (lipoprotein uptake and ACAT-1 proteasomal degradation) using multiple in vitro methods\",\n      \"pmids\": [\"22632897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AKT3 controls mitochondrial biogenesis and PGC-1α subcellular localization in endothelial cells by stabilizing CRM-1 (the major nuclear export receptor); AKT3 knockdown causes CRM-1-dependent nuclear export of PGC-1α, ~3-fold reduction in PGC-1α target gene expression, and autophagy induction in a CRM-1-dependent, Akt1/mTOR-independent manner; Akt3-null mice show dose-dependent decreases in angiogenesis.\",\n      \"method\": \"Site-directed mutagenesis, CRM-1 overexpression, siRNA knockdown, autophagosome assay, Matrigel plug angiogenesis in vivo\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis plus association analyses plus multiple orthogonal knockdown/overexpression strategies plus in vivo validation\",\n      \"pmids\": [\"24081905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AKT3 silencing, but not AKT1 or AKT2, markedly upregulates p27 cell-cycle inhibitor and inhibits growth of triple-negative breast cancer (TNBC) cells in 3D spheroid cultures and xenograft models; AKT3 does not promote invasion unlike AKT1.\",\n      \"method\": \"shRNA screen, 3D spheroid culture, mouse xenograft, p27 protein analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-specific shRNA with mechanistic readout (p27), validated in both in vitro and in vivo models\",\n      \"pmids\": [\"24335962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AKT3 controls VEGF secretion in ovarian cancer cells by regulating expression of the Golgi protein RCAS1; blockade of AKT3 (but not AKT1) reduces RCAS1 expression, retains VEGF in the endoplasmic reticulum, and reduces tumor vascularization in xenografts.\",\n      \"method\": \"shRNA knockdown, AKT3 overexpression, VEGF secretion assay, RCAS1 siRNA, xenograft mouse model\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific knockdown with mechanistic pathway (RCAS1/VEGF secretion) validated by rescue experiments, single lab\",\n      \"pmids\": [\"21351097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AKT3 knockdown in ErbB2+ breast cancer cells reduces ErbB2 and ErbB3 expression and tyrosine phosphorylation, while strongly upregulating ERα expression through decreased phosphorylation of the AKT substrate FOXO3a; AKT3-specific kinase activity (not AKT1 or AKT2) is detected in ErbB2+ and triple-negative tumors.\",\n      \"method\": \"AKT isoform-specific in vitro kinase assay, isoform-specific siRNA knockdown, western blot for ErbB2/ErbB3/ERα/Foxo3a\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific kinase assay combined with siRNA mechanistic dissection, single lab\",\n      \"pmids\": [\"24463007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"An AKT3-FOXG1-reelin signaling pathway underlies focal malformations of cortical development (FMCD): AKT3(E17K) mutation in neural progenitors causes FOXG1-dependent derepression of reelin transcription, leading to non-cell-autonomous migration defects in neighboring cells; blocking AKT signaling or inactivating reelin restores migration.\",\n      \"method\": \"In utero electroporation in mouse, immunoprecipitation, pathway inhibition, reelin functional rescue\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse brain model with cell-autonomous vs. non-cell-autonomous dissection, pharmacological and genetic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"26523971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Genomically amplified Akt3, but not Akt1, drives progression to high-grade glioma in a mouse model; Akt3-expressing glioma cells show dominant activation of DNA repair pathways, enhanced DNA repair protein activation, and increased resistance to radiation and temozolomide compared to Akt1/Akt2.\",\n      \"method\": \"RCAS/Ntv-a mouse glioma model, gene expression profiling, DNA repair assays, irradiation/drug resistance assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse model with isoform comparisons, gene expression profiling, and functional DNA repair assays in human GBM cells\",\n      \"pmids\": [\"25737557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AKT3 downregulation in triple-negative breast cancer (MDA-MB-231) cells increases migration in vitro and combined AKT2/3 or AKT1/3 knockdown significantly increases metastasis formation in vivo; AKT3 depletion increases S100A4 protein, and S100A4 silencing reverses the increased migration.\",\n      \"method\": \"Isoform-specific shRNA knockdown, live cell imaging, transwell migration, xenograft metastasis model, S100A4 siRNA rescue\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific shRNA with in vivo metastasis readout and mechanistic rescue, single lab\",\n      \"pmids\": [\"26741489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Akt3 deficiency impairs hippocampal CA1 protein synthesis-dependent long-LTP and long-term spatial memory via inactivation of mTOR; Akt3-KO mice show reduced basal mTOR phosphorylation and failure to activate mTOR-p70S6K-4EBP2-eIF4E signaling cascade and AMPA receptor upregulation after HFS.\",\n      \"method\": \"Akt3 knockout mouse, Morris water maze, electrophysiology (LTP), western blot for mTOR pathway\",\n      \"journal\": \"Acta physiologica (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with mechanistic pathway dissection by electrophysiology and biochemistry, single lab\",\n      \"pmids\": [\"30053339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AKT3 is a first-responding isoform that preferentially senses native electrophilic lipids (4-hydroxynonenal); electrophile modification occurs at Cys119, and an AKT3 C119S mutant is hypomorphic for all downstream phenotypes, establishing C119 as the privileged electrophile-sensing cysteine distinct from Akt2 oxidative regulation.\",\n      \"method\": \"Redox-targeting screen, digest MS sequencing of modified cysteine, C119S mutagenesis, zebrafish in vivo validation\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — MS-identified modification site, mutagenesis confirming functional requirement, validated in cells and in vivo (zebrafish), multiple orthogonal methods\",\n      \"pmids\": [\"28114274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Akt3 specifically phosphorylates WNK1 at T58 and promotes its degradation via the ubiquitin-proteasome pathway; loss of Akt3 in adipocytes increases WNK1, activates SGK1, which phosphorylates/inhibits FOXO1 and activates PPARγ transcription to promote adipogenesis.\",\n      \"method\": \"Site-specific phosphorylation assay (T58), ubiquitin-proteasome pathway analysis, Akt3 KO mouse on high-fat diet, SGK1 pharmacological inhibition rescue\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — identified phosphorylation site on WNK1, mechanistic cascade validated by multiple genetic and pharmacological interventions in vitro and in vivo\",\n      \"pmids\": [\"29202451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Akt3 suppresses macropinocytosis of LDL in macrophages through a WNK1/SGK1/Cdc42 pathway: Akt3 deficiency increases WNK1 expression → SGK1 activity → Cdc42 expression, promoting actin assembly and pinocytosis; individual suppression of WNK1, SGK1, or Cdc42 in Akt3-deficient macrophages rescues the phenotype.\",\n      \"method\": \"siRNA knockdown of WNK1/SGK1/Cdc42, fluid-phase pinocytosis assay, murine and human macrophages\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic cascade dissected by stepwise rescue experiments in two macrophage systems (murine and human), multiple orthogonal suppression strategies\",\n      \"pmids\": [\"28389565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AKT3 (but not AKT1 or AKT3) deletion impairs cortical Akt Ser473 phosphorylation in an allele-dose dependent manner and reduces mTORC2 complex proteins Rictor and Sin1, indicating AKT3 is the dominant regulator of AKT/mTOR signaling in brain.\",\n      \"method\": \"Akt3 heterozygous and null mouse model, western blot for Ser473-pAkt, Rictor, Sin1, behavioral testing battery\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic model with pathway protein quantification, single lab, correlative mechanism for mTORC2 link\",\n      \"pmids\": [\"28467426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Akt1 and Akt3 (but not Akt2) physically interact with DNA-PKcs and stimulate repair of ionizing radiation-induced DNA double-strand breaks in K-RAS-mutated cancer cells; Akt1 preferentially binds the N-terminal domain of DNA-PKcs while Akt3 interacts with all domains without preference; Akt1 activity correlates with Akt1/DNA-PKcs complex formation.\",\n      \"method\": \"Pull-down with eGFP-tagged DNA-PKcs fragments, mCherry-tagged Akt isoforms, clonogenic survival, DSB repair assays, xenograft tumor growth\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal pull-down with domain mapping, functional repair assays, single lab\",\n      \"pmids\": [\"29090098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Akt3 deletion in mice is associated with reduced phosphorylation of GSK3α/β at Ser21/9 in multiple brain regions without affecting Akt1 or Akt2 levels; chronic lithium treatment restores pGSK3α/β levels and rescues depressive and anxiety-like behaviors in Akt3 KO mice.\",\n      \"method\": \"Akt3 knockout mouse, behavioral battery, western blot for pGSK3α/β, lithium pharmacological rescue\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with pathway biochemistry and pharmacological rescue in vivo, single lab\",\n      \"pmids\": [\"28442992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Akt3 (but not Akt1 or Akt2) is required for survival and proliferation of mouse embryonic stem cells (ESCs) in a kinase activity-dependent manner; Akt3 depletion leads to G1 cell cycle arrest and nuclear accumulation of p53 with activation of downstream targets (Mdm2, p21, Fas); inhibiting p53 partially rescues Akt3-depletion effects.\",\n      \"method\": \"Isoform-specific inhibition and siRNA in ESCs, kinase-dead mutant, flow cytometry, p53 nuclear fractionation, p53 inhibitor rescue\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase-dead mutant plus siRNA with mechanistic p53 pathway dissection, single lab\",\n      \"pmids\": [\"28483982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AKT3 promotes PGC-1α nuclear localization through inhibitory effects on CRM-1 (nuclear export protein), driving mitochondrial biogenesis; PPARG overexpression transcriptionally increases AKT3 levels, which elevates nuclear PGC-1α and increases mitochondrial mass and ATP production in prostate cancer.\",\n      \"method\": \"AKT3 overexpression/knockdown, PGC-1α subcellular fractionation, CRM-1 interaction analysis, mitochondrial biogenesis assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional validation of PPARG→AKT3→CRM-1→PGC-1α axis with subcellular localization and mitochondrial readouts, single lab\",\n      \"pmids\": [\"33654198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Akt3 inhibits vascular tumor endothelial cell growth and migration by inhibiting S6-Kinase (S6K) activation through modulation of Rictor expression; S6K in turn acts through a negative feedback loop to restrain Akt3 expression; Akt1 and Akt3 have opposing roles in vascular tumor growth.\",\n      \"method\": \"Akt isoform-specific manipulation in endothelial cells, S6K activity assay, Rictor expression analysis, S6K inhibitor, tumor growth assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional epistasis between Akt3, Rictor, and S6K with pharmacological validation, single lab\",\n      \"pmids\": [\"25388284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AKT3 depletion in T cells (but not neurons) impairs differentiation toward FOXP3+ iTregs and worsens clinical course of EAE; Akt3-enhanced kinase activity mice show increased iTreg efficiency and delayed disease onset, establishing AKT3's role in T-cell-mediated neuroprotection.\",\n      \"method\": \"Conditional Akt3 deletion in CD4+ T-cells (vs. Syn1-CKO in neurons), EAE model, flow cytometry for FOXP3+ Tregs\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific conditional KO with functional disease model comparison, single lab\",\n      \"pmids\": [\"31404142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AKT3 knockdown in AKT inhibitor (MK2206)-resistant breast cancer cells restores sensitivity to the inhibitor; AKT3 upregulation in resistant cells is regulated epigenetically by bromodomain and extra terminal domain (BET) proteins; AKT3 depletion also diminishes the epithelial-to-mesenchymal transition phenotype in resistant cells.\",\n      \"method\": \"Step-wise drug resistance model, isoform-specific siRNA, BET inhibitor treatment, EMT marker analysis\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional resistance model with mechanistic epigenetic regulation identified, single lab\",\n      \"pmids\": [\"27297869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AKT3 promotes prostate cancer cell proliferation by increasing total AKT, phospho-AKT (S473/T308), B-Raf expression, and activating mTOR/p70S6K signaling while decreasing TSC1 and TSC2 expression; AKT3 knockdown sensitizes cells to B-Raf inhibitor.\",\n      \"method\": \"Plasmid overexpression, siRNA knockdown, western blot for pathway components, drug sensitivity assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with multiple pathway readouts, single lab\",\n      \"pmids\": [\"26318033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Akt3 deficiency in ApoE-/- mice increases atherosclerosis in a macrophage-dependent manner; Akt3 specifically inhibits macrophage cholesteryl ester accumulation and foam cell formation, with Akt1 and Akt3 showing differential subcellular localization in macrophages.\",\n      \"method\": \"Akt3-/- × ApoE-/- mouse genetics, macrophage transfer experiments, subcellular fractionation, cholesterol assay\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic model with macrophage-specific transfer experiments demonstrating cell-type dependence, subcellular localization data, replicated from original 2012 paper\",\n      \"pmids\": [\"22632897\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AKT3 (PKBγ/PKBG/RAC-gamma) is a serine/threonine kinase activated by dual phosphorylation at Thr305 and Ser472 (and electrophilic modification at Cys119) that functions as the brain-predominant AKT isoform regulating cell size, number, and mTORC2/mTOR signaling during postnatal brain development; it phosphorylates V600E B-RAF (at Ser364/Ser428) to modulate MAPK signaling in melanoma, controls mitochondrial biogenesis and nuclear export of PGC-1α through CRM-1 stabilization, suppresses macrophage foam cell formation and macropinocytosis via a WNK1/SGK1/Cdc42 pathway, promotes DNA double-strand break repair by interacting with DNA-PKcs, modulates T-cell iTreg differentiation, and drives neural progenitor AKT3(E17K)-FOXG1-reelin signaling to control cortical migration, with its deregulation (via gene amplification or PTEN loss) driving melanoma, glioma, and breast cancer survival and drug resistance.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AKT3 (PKB\\u03b3) is a serine/threonine kinase activated by dual phosphorylation at Thr305 and Ser472 that serves as the brain-predominant AKT isoform and a context-specific driver of cell size, survival, and metabolic signaling [#1, #5]. Its catalytic activity is switched on by insulin and antagonized by PKC through a PH-domain-independent mechanism [#0, #2], and a distinct layer of regulation operates through direct electrophilic modification of Cys119 by lipid-derived 4-hydroxynonenal, making AKT3 a first-responding redox sensor whose Cys119 is functionally required for downstream phenotypes [#22]. In the central nervous system AKT3 is the dominant regulator of AKT/mTOR signaling: its loss reduces brain size, cell number, and cell size with attenuated brain mTOR activity, lowers Ser473-AKT phosphorylation and mTORC2 components Rictor and Sin1, and impairs hippocampal protein-synthesis-dependent long-term potentiation and spatial memory [#5, #6, #25, #21]. Gain-of-function in this same axis is pathogenic: a kinase-domain mutation causes brain overgrowth and seizures via elevated S6 phosphorylation [#12], and the activating AKT3(E17K) mutation in neural progenitors drives focal malformations of cortical development through a FOXG1-dependent derepression of reelin that perturbs migration of neighboring cells [#18]. AKT3 also exerts isoform-specific control over substrates and trafficking: it phosphorylates and degrades WNK1 at Thr58, restraining an SGK1/Cdc42 cascade that otherwise promotes macrophage macropinocytosis, foam-cell formation, and adipogenesis [#23, #24, #13]; it stabilizes nuclear PGC-1\\u03b1 by acting on the export receptor CRM-1 to drive mitochondrial biogenesis [#14, #29]; and it phosphorylates V600E B-RAF at Ser364/Ser428 to tune MAPK output during melanoma initiation [#10]. Across melanoma, glioma, and breast and prostate cancers, AKT3 deregulation through gene amplification, PTEN loss, or the E17K mutation drives survival, proliferation, DNA double-strand break repair via DNA-PKcs, and resistance to BRAF/AKT inhibitors, radiation, and temozolomide [#4, #9, #19, #26, #32].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing how AKT3 is switched on answered whether the third AKT isoform shares the canonical dual-phosphorylation activation logic of AKT1/AKT2.\",\n      \"evidence\": \"in vitro kinase assays with site-directed mutagenesis of Thr305/Ser472 and insulin/PKC stimulation in adipocytes\",\n      \"pmids\": [\"10491192\", \"10208883\", \"9480839\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"upstream kinase(s) for Thr305/Ser472 not identified\", \"structural basis of PKC-mediated PH-domain-independent inhibition unresolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Linking AKT3 hyperactivity to hormone-independent and PTEN-null cancer cells first implicated it as the dominant active AKT isoform in specific tumor contexts.\",\n      \"evidence\": \"isoform-specific enzymatic activity assays across breast and prostate cancer cell lines\",\n      \"pmids\": [\"10419456\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"correlative activity measurement without functional dependency test\", \"mechanism connecting PTEN loss to selective AKT3 activation unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Isoform-specific knockdown defined AKT3 as a non-redundant survival driver in melanoma, not just an active isoform.\",\n      \"evidence\": \"AKT3-selective siRNA with apoptosis readout and PTEN re-expression across melanoma lines\",\n      \"pmids\": [\"15466193\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"downstream survival substrates not defined here\", \"relative contribution of amplification vs PTEN loss not quantified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Knockout and compound-allele genetics established AKT3 as the brain-predominant isoform controlling both cell size and number, with dosage-dependent essentiality.\",\n      \"evidence\": \"Akt3-null and Akt1/Akt3 compound knockout mice with histology, MRI, and brain mTOR analysis\",\n      \"pmids\": [\"15713641\", \"15930105\", \"16287854\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"molecular targets mediating brain mTOR regulation not identified\", \"cell-type origin of size vs number phenotypes not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of AKT3(E17K) and direct phosphorylation of V600E B-RAF showed how AKT3 both becomes constitutively active and cross-regulates MAPK signaling in melanoma.\",\n      \"evidence\": \"clinical specimen sequencing, functional expression, and site-specific B-RAF phosphorylation/transformation assays\",\n      \"pmids\": [\"18813315\", \"18451171\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"physiological frequency and in vivo consequence of Ser364/Ser428 B-RAF phosphorylation not established\", \"E17K functional validation in single lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Constitutively active AKT3 was shown to confer apoptosis resistance to BRAF-mutant melanoma, defining a mechanism of BRAF-inhibitor escape.\",\n      \"evidence\": \"siRNA, PLX4720 treatment, and ectopic active AKT3 in 3D collagen with BH3-only protein readouts\",\n      \"pmids\": [\"20647317\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"direct AKT3 substrates controlling Bim-EL/Bmf/Mcl-1 not identified\", \"single-lab apoptosis assays\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"A gain-of-function kinase-domain mutation linked elevated AKT3 catalytic activity to brain overgrowth and epilepsy in vivo.\",\n      \"evidence\": \"Nmf350 mutant kinase assays, EEG, and S6 phosphorylation immunohistochemistry versus null mice\",\n      \"pmids\": [\"21159799\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"circuit-level basis of seizures not defined\", \"whether S6 hyperphosphorylation is causal vs correlative untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Macrophage genetics revealed AKT3 as an atheroprotective isoform that limits foam-cell formation by promoting ACAT-1 degradation and reducing lipoprotein uptake.\",\n      \"evidence\": \"Akt3/ApoE double-knockout mice, cholesterol accumulation assays, ACAT-1 degradation, and macrophage transfer\",\n      \"pmids\": [\"22632897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"direct AKT3 substrate driving ACAT-1 proteasomal turnover not identified\", \"basis of Akt1 vs Akt3 differential localization unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Work in endothelial and cancer cells defined AKT3 as a controller of organelle trafficking and biogenesis through CRM-1/PGC-1\\u03b1 and RCAS1/VEGF axes.\",\n      \"evidence\": \"knockdown/overexpression with subcellular fractionation, CRM-1 manipulation, VEGF secretion assays, and in vivo angiogenesis\",\n      \"pmids\": [\"24081905\", \"21351097\", \"33654198\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether AKT3 phosphorylates CRM-1 or PGC-1\\u03b1 directly not shown\", \"RCAS1 regulation mechanism downstream of AKT3 incomplete\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Isoform-resolved knockdown distinguished AKT3 from AKT1 functionally in breast cancer, controlling p27 and proliferation rather than invasion.\",\n      \"evidence\": \"shRNA screen with 3D spheroid and xenograft growth and p27 analysis\",\n      \"pmids\": [\"24335962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mechanism linking AKT3 to p27 upregulation not defined\", \"opposing migration roles of AKT isoforms only partly explained\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The AKT3-FOXG1-reelin pathway explained how an activating AKT3 mutation produces non-cell-autonomous cortical migration defects underlying focal malformations of cortical development.\",\n      \"evidence\": \"in utero electroporation of AKT3(E17K), immunoprecipitation, and pharmacological/genetic reelin rescue\",\n      \"pmids\": [\"26523971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"direct biochemical link between AKT3 and FOXG1 not fully mapped\", \"human genotype-phenotype correlation beyond mouse model not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Migration and metastasis studies showed AKT3 loss can paradoxically increase TNBC cell motility via S100A4, refining its isoform-specific role in tumor progression.\",\n      \"evidence\": \"isoform-specific shRNA, migration assays, xenograft metastasis, and S100A4 rescue\",\n      \"pmids\": [\"26741489\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mechanism by which AKT3 suppresses S100A4 unknown\", \"single-lab in vivo metastasis data\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"An AKT3-Rictor-S6K feedback circuit was defined, showing AKT3 restrains vascular tumor endothelial growth opposite to AKT1.\",\n      \"evidence\": \"isoform manipulation in endothelial cells with S6K and Rictor analysis and S6K inhibition\",\n      \"pmids\": [\"25388284\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"molecular basis of Rictor modulation by AKT3 not shown\", \"single-lab functional epistasis\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Amplified AKT3 was shown to drive glioma progression and therapeutic resistance through preferential activation of DNA repair pathways.\",\n      \"evidence\": \"RCAS/Ntv-a mouse glioma model, expression profiling, and DNA repair/radioresistance assays in human GBM cells\",\n      \"pmids\": [\"25737557\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"direct repair substrates of AKT3 not identified here\", \"isoform-selective therapeutic vulnerability not tested clinically\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Prostate cancer studies positioned AKT3 as an amplifier of total AKT/mTOR signaling and a determinant of B-Raf inhibitor sensitivity.\",\n      \"evidence\": \"overexpression/knockdown with pathway western blots and drug sensitivity assays\",\n      \"pmids\": [\"26318033\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mechanism of TSC1/TSC2 downregulation by AKT3 not defined\", \"single-lab correlative pathway data\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"BET-protein-driven epigenetic upregulation of AKT3 was identified as a mechanism of AKT-inhibitor resistance, linking AKT3 to EMT in breast cancer.\",\n      \"evidence\": \"stepwise MK2206-resistance model, isoform-specific siRNA, BET inhibition, and EMT marker analysis\",\n      \"pmids\": [\"27297869\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"direct BET target genes regulating AKT3 not mapped\", \"single-lab resistance model\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery of Cys119 as a privileged electrophile-sensing residue revealed a redox-dependent activation mode of AKT3 distinct from AKT2 oxidative regulation.\",\n      \"evidence\": \"redox-targeting screen, MS site identification, C119S mutagenesis, and zebrafish validation\",\n      \"pmids\": [\"28114274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"physiological electrophile sources in mammalian tissues not defined\", \"structural mechanism of Cys119 activation unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of WNK1 Thr58 phosphorylation and the WNK1/SGK1/Cdc42 axis defined how AKT3 suppresses macrophage macropinocytosis and adipogenesis through a specific substrate.\",\n      \"evidence\": \"site-specific phosphorylation, ubiquitin-proteasome analysis, stepwise rescue of WNK1/SGK1/Cdc42, and Akt3-KO mice on high-fat diet\",\n      \"pmids\": [\"29202451\", \"28389565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether AKT3 directly recognizes WNK1 in vivo across all tissues not shown\", \"interplay with the parallel ACAT-1 pathway not integrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"AKT3 was shown to be the dominant brain regulator of AKT/mTORC2 signaling and to control GSK3 phosphorylation, hippocampal LTP, and mood/memory behaviors.\",\n      \"evidence\": \"Akt3 heterozygous/null mice with Ser473-pAKT, Rictor/Sin1, pGSK3 westerns, electrophysiology, behavioral batteries, and lithium rescue\",\n      \"pmids\": [\"28467426\", \"30053339\", \"28442992\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mechanism by which AKT3 sustains mTORC2 component levels not defined\", \"single-lab behavioral findings\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Physical interaction with DNA-PKcs and a requirement in embryonic stem cell survival expanded AKT3's roles into DNA double-strand break repair and p53-controlled proliferation.\",\n      \"evidence\": \"reciprocal pull-downs with DNA-PKcs domain mapping, DSB repair/clonogenic assays, and kinase-dead/siRNA ESC studies with p53 rescue\",\n      \"pmids\": [\"29090098\", \"28483982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"functional consequence of AKT3-DNA-PKcs binding vs AKT1 unclear\", \"whether AKT3 phosphorylates DNA-PKcs not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Cell-type-specific conditional deletion revealed a T-cell-intrinsic role for AKT3 in iTreg differentiation and CNS autoimmune protection.\",\n      \"evidence\": \"CD4+ T-cell vs neuronal conditional Akt3 knockout in the EAE model with FOXP3+ Treg flow cytometry\",\n      \"pmids\": [\"31404142\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"AKT3 substrates governing FOXP3 induction not identified\", \"single-lab model\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Cardiac transgenic overexpression demonstrated AKT3-driven hypertrophy and revealed negative feedback downregulation of other AKT isoforms.\",\n      \"evidence\": \"cardiac-specific constitutively active AKT3 transgenic mice with echocardiography and AKT1/2 protein analysis\",\n      \"pmids\": [\"15698844\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mechanism of cross-isoform feedback downregulation not defined\", \"single-lab transgenic model\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AKT3 achieves isoform-specific substrate selection and tissue-restricted dominance over AKT1/AKT2 across brain, immune, vascular, and tumor contexts remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"no structural basis for AKT3 substrate specificity\", \"upstream signals dictating isoform dominance not defined\", \"unified model linking redox, phospho, and PTEN-loss activation modes missing\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 10, 23]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [1, 10, 23]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [14, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [13, 34]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [14, 29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 5, 25]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 6, 18]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [4, 19, 18]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [19, 26]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [13, 23, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BRAF\", \"WNK1\", \"DNA-PKcs\", \"FOXG1\", \"CRM-1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}