{"gene":"AKT3","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2005,"finding":"Akt3 knockout mice display a selective 20% decrease in brain size with smaller and fewer cells (reduced cell size and cell number), distinct from Akt1 knockout which reduces cell number only; mTOR signaling is specifically attenuated in Akt3-/- but not Akt1-/- brains, indicating isoform-specific regulation of cell growth via mTOR.","method":"Akt3 knockout mouse model with organ size measurements, cell counting, cell size analysis, and mTOR pathway activity assessment","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific cellular phenotype and pathway placement, replicated phenotype across multiple readouts","pmids":["15713641"],"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 kinase activation, as mutation of both to aspartate increased catalytic activity and mutation to alanine inhibited activation; the kinase is inhibited by staurosporine and Ro 31-8220.","method":"Molecular cloning, site-directed mutagenesis, in vitro kinase assay","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay with mutagenesis defining activation mechanism","pmids":["10491192"],"is_preprint":false},{"year":1999,"finding":"Akt3 enzymatic activity is 20–60-fold elevated in estrogen receptor-deficient breast cancer cells and androgen-insensitive prostate cancer cells compared to hormone-responsive cells; in PTEN-null prostate cancer cells, Akt3 constitutive activity represents the dominant active Akt isoform.","method":"In vitro kinase activity assay across multiple cancer cell lines","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — enzymatic activity measured directly in multiple cell lines with isoform specificity controls","pmids":["10419456"],"is_preprint":false},{"year":2001,"finding":"Membrane-targeted (myristylated) Akt3 is strongly oncogenic in chicken embryo fibroblasts, inducing multilayered foci and hemangiosarcomas in animals, with enhanced kinase activity; wild-type Akt3 is only weakly transforming, demonstrating that membrane localization and kinase activation are required for full oncogenic potential.","method":"RCAS retroviral expression in chicken embryo fibroblasts, focus formation assay, animal tumor model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — in vitro transformation assay plus in vivo tumor model with kinase activity measurements","pmids":["11466625"],"is_preprint":false},{"year":2006,"finding":"Akt2-/-Akt3-/- double knockout mice survive but exhibit glucose and insulin intolerance, ~25% reduced body weight, and substantial reductions in brain and testis size, demonstrating non-redundant in vivo roles of Akt2 and Akt3 in whole-animal size and individual organ size determination.","method":"Double knockout mouse model with metabolic, weight, and organ size measurements","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO with multiple defined phenotypic readouts","pmids":["16923958"],"is_preprint":false},{"year":2008,"finding":"Akt3, but not Akt1, is specifically required for VEGF-induced mitochondrial biogenesis in endothelial cells; Akt3 silencing decreases mitochondrial gene expression, mtDNA content, nuclear-encoded mitochondrial gene transcripts, O2 consumption, and TOM70 expression; Akt3 knockdown causes cytoplasmic accumulation of PGC-1α (master regulator of mitochondrial biogenesis); Akt3 knockout mice show an abnormal mitochondrial phenotype in brain tissue.","method":"Akt3 gene silencing by siRNA/shRNA with comparison to Akt1 silencing, mitochondrial gene/mtDNA quantification, O2 consumption measurement, PGC-1α localization, Akt3 KO mouse tissue analysis","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including in vitro silencing, in vivo KO, subcellular localization, functional readouts; isoform specificity established by direct comparison","pmids":["18524868"],"is_preprint":false},{"year":2011,"finding":"Akt3 is expressed in platelets and Akt3-/- mouse platelets exhibit impaired aggregation and secretion in response to low concentrations of thrombin receptor agonists and thromboxane A2 (but not collagen or VWF); Akt3 promotes platelet activation by phosphorylating and inhibiting GSK-3β at Ser9; pharmacological rescue of GSK-3β inhibition restores Akt3-/- platelet aggregation defect; Akt3-/- mice show retarded FeCl3-induced carotid artery thrombosis in vivo.","method":"Akt3 KO mouse platelets, platelet aggregation/secretion assays, GSK-3β phosphorylation analysis, GSK-3β inhibitor rescue, in vivo thrombosis model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — KO model with multiple functional assays, pharmacological rescue, and in vivo validation","pmids":["21821713"],"is_preprint":false},{"year":2012,"finding":"Akt3 deficiency in macrophages promotes foam cell formation and atherosclerosis; Akt3 specifically inhibits cholesteryl ester accumulation 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 KO in hyperlipidemic ApoE-/- mice, macrophage cholesteryl ester assays, lipoprotein uptake measurements, ACAT-1 protein degradation analysis with ubiquitin-proteasome pathway assessment, subcellular fractionation","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO model plus in vitro mechanistic dissection with defined pathway placement","pmids":["22632897"],"is_preprint":false},{"year":2013,"finding":"Akt3 controls mitochondrial biogenesis and autophagy via regulation of CRM-1 (chromosome maintenance region-1), the major nuclear export receptor; Akt3 knockdown destabilizes CRM-1, causing PGC-1α nuclear export in a CRM-1-dependent manner; Akt3 knockdown induces autophagosome formation via a CRM-1-dependent, Akt1/mTOR-independent pathway; Akt3-null and heterozygous mice show dose-dependent decreases in angiogenesis in vivo.","method":"Akt3 knockdown, site-directed mutagenesis, co-immunoprecipitation/association analyses, autophagosome assay, PGC-1α localization, Matrigel angiogenesis assay in Akt3 KO mice","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, mechanistic dissection with mutagenesis and pathway placement, in vivo validation","pmids":["24081905"],"is_preprint":false},{"year":2011,"finding":"Akt3, but not Akt1, controls VEGF secretion in ovarian cancer cells; Akt3 blockade reduces VEGF secretion and causes retention of VEGF protein in the endoplasmic reticulum; Akt3 regulates expression of Golgi protein RCAS1, which in turn controls VEGF secretion; Akt3 overexpression increases RCAS1 expression and VEGF secretion.","method":"shRNA knockdown of Akt3 vs Akt1, VEGF secretion assay, ER retention imaging, RCAS1 siRNA, xenograft mouse model","journal":"International journal of cancer","confidence":"High","confidence_rationale":"Tier 2 — isoform-specific knockdown with mechanistic pathway placement, in vivo validation, and rescue experiments","pmids":["21351097"],"is_preprint":false},{"year":2014,"finding":"Akt3 and Akt1 exert opposing roles in vascular tumor growth: Akt1 promotes and Akt3 inhibits vascular tumor growth; Akt3 inhibits tumor endothelial cell growth and migration by suppressing S6-Kinase (S6K) activation through modulation of Rictor expression; S6K in turn suppresses Akt3 expression via negative feedback.","method":"Gain- and loss-of-function of individual Akt isoforms, in vivo vascular tumor model, S6K pathway analysis, Rictor expression measurement","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — isoform-specific manipulation with defined pathway epistasis, in vivo validation","pmids":["25388284"],"is_preprint":false},{"year":2012,"finding":"N-cadherin expression in mammary tumor cells selectively inhibits Akt3 expression and phosphorylation, leading to increased cell motility; Akt3 knockdown increases cell motility; Akt3 overexpression inhibits motility promoted by N-cadherin, establishing Akt3 as a downstream suppressor of N-cadherin-driven cell migration.","method":"N-cadherin overexpression in PyMT and MCF-7 cells, Akt3 knockdown and overexpression, motility assays, phosphorylation analysis","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — bidirectional gain/loss-of-function with mechanistic pathway placement and rescue experiments","pmids":["22410780"],"is_preprint":false},{"year":2017,"finding":"AKT3 mutations identified in megalencephaly patients all increase kinase activity as measured by ex vivo kinase assays; pleckstrin homology domain mutants (including p.E17K) exhibit enhanced phospholipid binding, explaining constitutive membrane recruitment and activation.","method":"Ex vivo kinase assays on engineered patient-mutation AKT3 constructs, phospholipid binding assay for PH domain mutants","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 1 — direct kinase and phospholipid binding assays on patient mutations, with multiple mutations tested","pmids":["28969385"],"is_preprint":false},{"year":2017,"finding":"Akt3 loss-of-function in mice dramatically impairs cortical Akt Ser473 phosphorylation in an allele dose-dependent manner with concomitant reduction of mTORC2 complex proteins Rictor and Sin1, identifying mTORC2 as the dominant upstream activator of Akt3 in brain and Akt3 as the primary regulator of Akt/mTOR signaling in brain.","method":"Akt3 heterozygous and null mice, western blot quantification of Akt Ser473, Rictor, and Sin1 in cortex","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — allele dose-dependent effect with mechanistic pathway dissection","pmids":["28467426"],"is_preprint":false},{"year":2017,"finding":"Akt3 deficiency in adipocytes increases WNK1 protein levels (by loss of Akt3-mediated phosphorylation of WNK1 at T58 and ubiquitin-proteasome degradation), leading to SGK1 activation; SGK1 then phosphorylates and inhibits FOXO1, activating PPARγ transcription and promoting adipogenesis; pharmacological blockade of SGK1 rescues the obesity phenotype in Akt3-deficient mice.","method":"Akt3 KO mouse model, phosphorylation site identification (WNK1 T58), ubiquitin-proteasome pathway analysis, SGK1 inhibitor treatment in vivo, adipogenesis assays","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 — KO model with defined substrate (WNK1 T58), pathway epistasis, and pharmacological rescue in vivo","pmids":["29202451"],"is_preprint":false},{"year":2021,"finding":"PPAR-γ overexpression drives increased AKT3 expression; AKT3 promotes nuclear localization of PGC-1α by inhibiting CRM1 (nuclear export protein), driving mitochondrial biogenesis and elevated ATP production that fuels epithelial-to-mesenchymal transition in prostate cancer.","method":"PPAR-γ overexpression, AKT3 expression analysis, PGC-1α nuclear localization assay, CRM1 inhibition experiments, mitochondrial mass and ATP measurements","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway placement with subcellular localization data; single lab study","pmids":["33654198"],"is_preprint":false},{"year":2015,"finding":"AKT3 knockdown in triple-negative breast cancer cells increases migration in vitro, which is mediated by upregulation of S100A4 protein; siRNA knockdown of S100A4 reverses the increased migration caused by AKT3 depletion; combined AKT2/AKT3 or AKT1/AKT3 depletion increases metastasis in vivo, establishing AKT3 as an isoform-specific suppressor of migration/metastasis acting through S100A4.","method":"isoform-specific shRNA knockdown, live-cell imaging and transwell migration assays, S100A4 siRNA rescue, in vivo xenograft metastasis model","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — isoform-specific KD, mechanistic rescue experiment, and in vivo validation","pmids":["26741489"],"is_preprint":false},{"year":2016,"finding":"AKT3 upregulation in breast cancer cells confers resistance to the allosteric AKT inhibitor MK2206; knockdown of AKT3 (but not AKT1 or AKT2) in resistant cells restores MK2206 sensitivity; AKT3 induction in resistant cells is regulated epigenetically by bromodomain and extra terminal domain (BET) proteins.","method":"Step-wise drug resistance model, isoform-specific siRNA knockdown, BET inhibitor treatment, cell viability assays","journal":"Molecular cancer therapeutics","confidence":"High","confidence_rationale":"Tier 2 — isoform-specific rescue experiment with epigenetic mechanism identified","pmids":["27297869"],"is_preprint":false},{"year":2018,"finding":"Akt3 deletion in mice reduces GSK3α/β phosphorylation at Ser21/9 in multiple brain regions; this leads to behavioral phenotypes resembling schizophrenia, anxiety, and depression; chronic lithium treatment (which inhibits GSK3) restores GSK3α/β phosphorylation and rescues the behavioral deficits, placing GSK3 phosphorylation as a key downstream mechanism of Akt3 in psychiatric-relevant behavior.","method":"Akt3 KO mice, western blot of p-GSK3α/β, behavioral test battery, lithium rescue treatment","journal":"Frontiers in molecular neuroscience","confidence":"High","confidence_rationale":"Tier 2 — KO model with defined substrate phosphorylation changes, pharmacological rescue","pmids":["28442992"],"is_preprint":false},{"year":2018,"finding":"Akt3 deficiency in mice impairs protein synthesis-dependent long-LTP (HFS×4-induced) and long-term spatial memory; Akt3 KO reduces basal mTOR phosphorylation; HFS×4 fails to trigger mTOR-p70S6K signaling cascade or increase 4EBP2/eIF4E phosphorylation in Akt3 KO mice, indicating Akt3 regulates protein synthesis-dependent plasticity via mTOR-p70S6K pathway.","method":"Akt3 KO mice, Morris water maze, electrophysiological LTP recordings, western blot of mTOR/p70S6K/4EBP2/eIF4E pathway components","journal":"Acta physiologica","confidence":"High","confidence_rationale":"Tier 2 — KO model with electrophysiology and defined molecular pathway; multiple readouts","pmids":["30053339"],"is_preprint":false},{"year":2015,"finding":"AKT3 overexpression increases total AKT, phospho-AKT (S473 and T308), B-Raf, and downstream mTOR/p70S6K signaling while decreasing TSC1 and TSC2 proteins in prostate cancer cells; AKT3 knockdown sensitizes cells to B-Raf inhibitor treatment.","method":"Plasmid overexpression and siRNA knockdown of AKT3 in prostate cancer cell lines, western blot pathway analysis, drug sensitivity assay","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, overexpression/knockdown with western blot pathway analysis without direct substrate assay","pmids":["26318033"],"is_preprint":false},{"year":2017,"finding":"Akt3 specifically controls embryonic stem cell survival and proliferation; Akt3 inhibition causes nuclear accumulation of p53 and activation of downstream targets Mdm2, p21, and Fas; inhibiting p53 and its downstream targets partially rescues the effects of Akt3 depletion, identifying the Akt3-p53 axis as isoform-specific in ESC survival.","method":"Akt3 knockdown in mouse ESCs, p53 nuclear localization (western/fractionation), p53 inhibitor rescue, cell cycle and apoptosis assays","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 — isoform-specific KD with mechanistic pathway, rescue experiments; single lab","pmids":["28483982"],"is_preprint":false},{"year":2019,"finding":"M2-polarized tumor-associated macrophages activate the AKT3/PRAS40 signaling pathway in cholangiocarcinoma cells (via secreted cytokines), promoting EMT; AKT3 silencing (but not AKT1 or AKT2 silencing) markedly inhibits phosphorylation of AKT and PRAS40 and inhibits EMT in co-culture with M2-TAMs.","method":"Macrophage-cancer cell co-culture, isoform-specific AKT siRNA knockdown, p-AKT and p-PRAS40 western blot, EMT marker analysis","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — isoform-specific siRNA with functional readout; single lab, limited mechanistic depth","pmids":["31692069"],"is_preprint":false},{"year":2019,"finding":"Akt3-mediated protection against inflammatory demyelinating disease is specifically mediated by Akt3 in CD4+ T-cells (not neurons); conditional deletion of Akt3 in CD4+ T-cells worsens EAE, decreases FOXP3+ Treg cells, and increases CNS inflammation; enhanced Akt3 kinase activity increases FOXP3+ iTreg differentiation efficiency.","method":"Cell-type specific conditional Akt3 knockout mice (CD4-CKO and Syn1-CKO), EAE model, FOXP3 expression, flow cytometry","journal":"Frontiers in immunology","confidence":"High","confidence_rationale":"Tier 2 — cell-type specific conditional KO with defined phenotypic readout and mechanism (iTreg differentiation)","pmids":["31404142"],"is_preprint":false},{"year":2010,"finding":"IL-13 suppresses MMP-13 expression in human dermal fibroblasts via the PI3K/Akt3 pathway; Akt3-specific siRNA knockdown upregulates MMP-13 in IL-13-treated fibroblasts, indicating Akt3 negatively controls MMP-13 expression downstream of IL-13/PI3K signaling.","method":"Akt3-specific siRNA knockdown, cDNA microarray, MMP-13 mRNA and protein measurement, PI3K inhibitor treatment","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 3 — isoform-specific siRNA with functional readout; single lab study","pmids":["21191416"],"is_preprint":false},{"year":2009,"finding":"In malignant glioma cells, Akt2 and Akt3 (not Akt1) knockdown reduces phosphorylated Bad and induces caspase-dependent apoptosis; overexpression of Akt2 or Akt3 cross-suppresses expression of the other isoform; endogenous Akt3 shows high kinase activity in U87MG cells.","method":"Isoform-specific RNA interference and plasmid overexpression in glioma cell lines, Bad phosphorylation analysis, caspase-dependent apoptosis assay, kinase activity measurement","journal":"Neuro-oncology","confidence":"Medium","confidence_rationale":"Tier 2 — isoform-specific KD with mechanistic readout (Bad phosphorylation, caspase activation); single lab","pmids":["20167810"],"is_preprint":false},{"year":2021,"finding":"AKT3 controls expression of the cell cycle regulator p27KIP1 in CMS4 mesenchymal colorectal cancer cells; chemical inhibition or knockout of AKT3 hampers CMS4 cell outgrowth by regulating p27KIP1 levels; high AKT3 expression is associated with high EMT gene expression.","method":"AKT3 CRISPR knockout and chemical inhibition in CMS4 CRC cell lines and PDX models, p27KIP1 protein quantification, in vitro and in vivo growth assays","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with defined substrate (p27KIP1), single lab","pmids":["33673003"],"is_preprint":false},{"year":2022,"finding":"Isoform-selective AKT3 PROTAC degrader (12l) induces proteasomal degradation of AKT3 but not AKT1/2 in vitro and in vivo; selective AKT3 degradation suppresses growth of osimertinib-resistant NSCLC cells, validating a non-canonical, AKT3-specific survival function in drug-resistant cells.","method":"PROTAC-mediated targeted protein degradation, isoform selectivity profiling, cell viability assays, in vivo xenograft model","journal":"Journal of medicinal chemistry","confidence":"High","confidence_rationale":"Tier 1 — selective degradation tool with in vitro and in vivo validation of isoform-specific function","pmids":["36173763"],"is_preprint":false}],"current_model":"AKT3 is a serine/threonine kinase activated by phosphorylation at Thr305 and Ser472 downstream of PI3K/mTORC2 signaling that plays isoform-specific roles in brain size determination (via mTOR-dependent cell growth), mitochondrial biogenesis (via CRM-1-dependent PGC-1α nuclear retention), platelet activation (via GSK-3β phosphorylation at Ser9), macrophage cholesterol metabolism (via ACAT-1 ubiquitin-proteasome degradation), adipogenesis suppression (via WNK1 T58 phosphorylation and SGK1/FOXO1 pathway), vascular tumor suppression (via Rictor/S6K modulation), T-cell-mediated neuroprotection (by promoting FOXP3+ iTreg differentiation), and cancer cell migration suppression (via S100A4 regulation), with activating mutations causing constitutive PI3K pathway signaling underlying megalencephaly syndromes."},"narrative":{"teleology":[{"year":1999,"claim":"Defining AKT3's activation mechanism resolved whether this third AKT isoform used the same phosphorylation-dependent switch as AKT1/2: phosphorylation at both Ser472 and Thr305 is required for full catalytic activation, and constitutively elevated AKT3 activity was found to dominate in PTEN-null and hormone-insensitive cancer cells.","evidence":"Molecular cloning, site-directed mutagenesis with in vitro kinase assays, and kinase activity profiling across cancer cell panels","pmids":["10491192","10419456"],"confidence":"High","gaps":["Upstream kinase(s) responsible for each phosphorylation site not yet identified in this work","No structural basis for isoform-selective activation"]},{"year":2001,"claim":"Establishing that membrane recruitment converts AKT3 from weakly transforming to strongly oncogenic demonstrated that subcellular localization gates its kinase-dependent oncogenicity.","evidence":"Myristylated vs. wild-type AKT3 retroviral expression in chicken embryo fibroblasts; focus formation and hemangiosarcoma induction in vivo","pmids":["11466625"],"confidence":"High","gaps":["Endogenous membrane-targeting mechanism not defined","Identity of critical substrates mediating transformation unclear"]},{"year":2005,"claim":"The discovery that Akt3 knockout mice have selectively smaller brains—with both reduced cell size and number, and attenuated mTOR signaling—established AKT3 as a non-redundant, isoform-specific regulator of brain growth acting through the mTOR pathway.","evidence":"Akt3 KO mouse model with brain size, cell number, cell size, and mTOR pathway activity measurements","pmids":["15713641"],"confidence":"High","gaps":["Specific mTOR effectors mediating cell size vs. cell number effects not separated","Developmental timing of AKT3 requirement not resolved"]},{"year":2006,"claim":"Akt2/Akt3 double knockout mice demonstrated that AKT3 has non-redundant whole-organism roles beyond the brain, contributing to body weight, testis size, and metabolic homeostasis.","evidence":"Double KO mouse model with metabolic and organ measurements","pmids":["16923958"],"confidence":"High","gaps":["Relative contributions of Akt2 vs. Akt3 to metabolic phenotypes not individually resolved"]},{"year":2008,"claim":"Identification of AKT3 as selectively required for VEGF-induced mitochondrial biogenesis in endothelial cells—and its regulation of PGC-1α nuclear retention—revealed a novel isoform-specific function in organelle biogenesis distinct from canonical AKT survival signaling.","evidence":"Akt3 vs. Akt1 siRNA/shRNA in endothelial cells, mtDNA/O₂ consumption quantification, PGC-1α localization, Akt3 KO mouse brain mitochondria","pmids":["18524868"],"confidence":"High","gaps":["Molecular mechanism by which AKT3 retains PGC-1α in the nucleus not yet defined","Direct AKT3 substrate linking kinase activity to mitochondrial gene program unknown"]},{"year":2011,"claim":"Two studies established context-dependent roles: AKT3 promotes platelet activation by phosphorylating GSK-3β at Ser9, while in ovarian cancer it isoform-specifically controls VEGF secretion via RCAS1/Golgi-dependent trafficking.","evidence":"Akt3 KO mouse platelets with aggregation assays and GSK-3β inhibitor rescue; isoform-specific shRNA in ovarian cancer with VEGF secretion and ER retention imaging","pmids":["21821713","21351097"],"confidence":"High","gaps":["How AKT3 activates RCAS1 expression mechanistically unknown","Platelet AKT3 substrate specificity beyond GSK-3β not explored"]},{"year":2012,"claim":"AKT3 was shown to restrict macrophage foam cell formation by promoting ACAT-1 ubiquitin-proteasome degradation, and separately to suppress N-cadherin–driven breast cancer cell migration, consolidating its role as a cell-type–specific negative regulator in both atherosclerosis and metastasis.","evidence":"Akt3 KO in ApoE−/− mice with macrophage cholesterol/ACAT-1 degradation assays; N-cadherin/Akt3 bidirectional manipulation in mammary tumor cells with motility assays","pmids":["22632897","22410780"],"confidence":"High","gaps":["Direct phosphorylation target linking AKT3 to ACAT-1 ubiquitination not identified","N-cadherin mechanism of AKT3 transcriptional/translational suppression unclear"]},{"year":2013,"claim":"Identification of CRM-1 stabilization as the mechanism by which AKT3 retains PGC-1α in the nucleus resolved how AKT3 controls mitochondrial biogenesis, and revealed a CRM-1–dependent, mTOR-independent autophagy pathway.","evidence":"Akt3 knockdown with CRM-1 protein stability analysis, PGC-1α nuclear export assay, autophagosome quantification, Matrigel angiogenesis in Akt3 KO mice","pmids":["24081905"],"confidence":"High","gaps":["Whether AKT3 directly phosphorylates CRM-1 or acts indirectly not resolved","Autophagy pathway downstream effectors not identified"]},{"year":2015,"claim":"AKT3 was established as an isoform-specific suppressor of breast cancer cell migration acting through S100A4, with combined AKT isoform depletion increasing metastasis in vivo.","evidence":"Isoform-specific shRNA, S100A4 siRNA rescue of migration, in vivo xenograft metastasis model","pmids":["26741489"],"confidence":"High","gaps":["How AKT3 loss upregulates S100A4 protein mechanistically unknown","Whether S100A4 is a direct or indirect target not determined"]},{"year":2017,"claim":"Multiple 2017 studies converged to define AKT3's upstream activation and disease relevance: mTORC2 (Rictor/Sin1) was identified as the dominant upstream activator in brain, megalencephaly-associated mutations were shown to constitutively activate kinase activity (PH domain mutants via enhanced phospholipid binding), and AKT3 was linked to adipogenesis suppression by phosphorylating WNK1 at T58.","evidence":"Allele dose-dependent Rictor/Sin1 reduction in Akt3 KO cortex; ex vivo kinase and phospholipid binding assays on patient mutations; Akt3 KO adipocyte model with WNK1 T58 phosphorylation, SGK1 inhibitor rescue in vivo","pmids":["28467426","28969385","29202451"],"confidence":"High","gaps":["Structural basis for PH domain mutation-driven phospholipid selectivity not solved","Whether mTORC2 dependence extends to non-brain tissues not tested","WNK1 T58 phosphorylation not confirmed as direct in reconstituted system"]},{"year":2018,"claim":"AKT3's neurological roles were extended to synaptic plasticity and behavior: Akt3 KO impairs protein synthesis–dependent LTP via mTOR/p70S6K/4EBP2 and produces psychiatric-like behaviors rescued by lithium-mediated GSK-3 inhibition.","evidence":"Akt3 KO mice with electrophysiological LTP recordings, Morris water maze, p-mTOR/p-p70S6K/p-4EBP2 western blots; behavioral battery with lithium rescue and GSK-3α/β phosphorylation analysis","pmids":["30053339","28442992"],"confidence":"High","gaps":["Whether LTP and behavioral phenotypes share a single downstream mechanism or represent parallel pathways unclear","Cell-type specificity of AKT3 function in adult brain circuits not resolved"]},{"year":2019,"claim":"Cell-type–specific conditional knockout revealed that AKT3 protects against neuroinflammation by promoting FOXP3+ iTreg differentiation specifically in CD4+ T cells, not neurons, resolving the cellular origin of AKT3-dependent neuroprotection.","evidence":"CD4-Cre and Syn1-Cre conditional Akt3 KO mice in EAE model, FOXP3 flow cytometry","pmids":["31404142"],"confidence":"High","gaps":["Direct substrate linking AKT3 kinase activity to FOXP3 induction not identified","Whether this mechanism operates in other autoimmune contexts untested"]},{"year":2022,"claim":"Development of an AKT3-selective PROTAC degrader validated that AKT3 protein, specifically, sustains survival signaling in drug-resistant NSCLC, confirming isoform-selective dependency.","evidence":"PROTAC-mediated selective AKT3 degradation with isoform selectivity profiling, cell viability, and in vivo xenograft","pmids":["36173763"],"confidence":"High","gaps":["AKT3-specific substrates mediating drug resistance not identified","Whether selective AKT3 degradation has therapeutic utility in other resistance contexts unknown"]},{"year":null,"claim":"Key open questions include the structural basis for AKT3 isoform selectivity toward its substrates, the identity of direct phosphorylation targets mediating CRM-1 stabilization and ACAT-1 degradation, and whether the diverse tissue-specific functions reflect distinct substrate repertoires or context-dependent signaling scaffolds.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal structure of AKT3 in complex with isoform-specific substrates","Direct kinase–substrate relationships for CRM-1, ACAT-1, and S100A4 regulation unresolved","Systems-level substrate atlas comparing AKT1/2/3 phosphoproteomes lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,6,12,14]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[12]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,7]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,12]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[21]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,12,13,19]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[5,8,15]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[23]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[6]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[8]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[25]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[7,14]}],"complexes":[],"partners":["GSK3B","WNK1","PGC1A","CRM1","RICTOR","ACAT1","S100A4","PRAS40"],"other_free_text":[]},"mechanistic_narrative":"AKT3 is a PI3K/mTORC2-activated serine/threonine kinase that functions as the dominant AKT isoform in the brain and exerts non-redundant, tissue-specific roles in cell growth, mitochondrial biogenesis, lipid metabolism, immune regulation, and platelet activation. AKT3 is activated by phosphorylation at Thr305 and Ser472, with mTORC2 serving as its principal upstream activator in cortex, and signals through mTOR/p70S6K to control brain size, cell number, cell size, and protein synthesis–dependent synaptic plasticity; loss of Akt3 in mice causes selective microcephaly, impaired long-term potentiation, and psychiatric-relevant behavioral deficits rescued by GSK-3 inhibition [PMID:15713641, PMID:30053339, PMID:28442992, PMID:28467426]. In non-neuronal contexts, AKT3 promotes mitochondrial biogenesis by stabilizing CRM-1 to retain PGC-1α in the nucleus, suppresses adipogenesis by phosphorylating WNK1 at T58 to target it for proteasomal degradation, limits macrophage foam cell formation by degrading ACAT-1 via the ubiquitin–proteasome pathway, promotes FOXP3+ iTreg differentiation in CD4+ T cells, and facilitates platelet activation through GSK-3β Ser9 phosphorylation [PMID:24081905, PMID:29202451, PMID:22632897, PMID:31404142, PMID:21821713]. Activating AKT3 mutations—including PH-domain variants with enhanced phospholipid binding—cause constitutive PI3K/AKT pathway signaling and underlie megalencephaly syndromes [PMID:28969385]."},"prefetch_data":{"uniprot":{"accession":"Q9Y243","full_name":"RAC-gamma serine/threonine-protein kinase","aliases":["Protein kinase Akt-3","Protein kinase B gamma","PKB gamma","RAC-PK-gamma","STK-2"],"length_aa":479,"mass_kda":55.8,"function":"AKT3 is one of 3 closely related serine/threonine-protein kinases (AKT1, AKT2 and AKT3) called the AKT kinase, and which regulate many processes including metabolism, proliferation, cell survival, growth and angiogenesis. This is mediated through serine and/or threonine phosphorylation of a range of downstream substrates. Over 100 substrate candidates have been reported so far, but for most of them, no isoform specificity has been reported. AKT3 is the least studied AKT isoform. It plays an important role in brain development and is crucial for the viability of malignant glioma cells. AKT3 isoform may also be the key molecule in up-regulation and down-regulation of MMP13 via IL13. Required for the coordination of mitochondrial biogenesis with growth factor-induced increases in cellular energy demands. Down-regulation by RNA interference reduces the expression of the phosphorylated form of BAD, resulting in the induction of caspase-dependent apoptosis","subcellular_location":"Nucleus; Cytoplasm; Membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y243/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AKT3","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AKT3","total_profiled":1310},"omim":[{"mim_id":"618273","title":"MEGA-CORPUS-CALLOSUM SYNDROME WITH CEREBELLAR HYPOPLASIA AND CORTICAL MALFORMATIONS; MCCCHCM","url":"https://www.omim.org/entry/618273"},{"mim_id":"616638","title":"SMITH-KINGSMORE SYNDROME; 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Nucleic acids","url":"https://pubmed.ncbi.nlm.nih.gov/32810693","citation_count":28,"is_preprint":false},{"pmid":"31518563","id":"PMC_31518563","title":"MiR-125b-5p and miR-181b-5p inhibit keratinocyte proliferation in skin by targeting Akt3.","date":"2019","source":"European journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/31518563","citation_count":28,"is_preprint":false},{"pmid":"33799788","id":"PMC_33799788","title":"AKT3 Is a Novel Regulator of Cancer-Associated Fibroblasts in Head and Neck Squamous Cell Carcinoma.","date":"2021","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/33799788","citation_count":27,"is_preprint":false},{"pmid":"34930676","id":"PMC_34930676","title":"N6-methyladenosine-modified long non-coding RNA AGAP2-AS1 promotes psoriasis pathogenesis via miR-424-5p/AKT3 axis.","date":"2021","source":"Journal of dermatological science","url":"https://pubmed.ncbi.nlm.nih.gov/34930676","citation_count":27,"is_preprint":false},{"pmid":"30737029","id":"PMC_30737029","title":"Overexpression of miR-1258 inhibits cell proliferation by targeting AKT3 in osteosarcoma.","date":"2019","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/30737029","citation_count":27,"is_preprint":false},{"pmid":"29228422","id":"PMC_29228422","title":"MicroRNA-582-5p suppressed gastric cancer cell proliferation via targeting AKT3.","date":"2017","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/29228422","citation_count":27,"is_preprint":false},{"pmid":"27422127","id":"PMC_27422127","title":"The role of AKT isoforms in glioblastoma: AKT3 delays tumor progression.","date":"2016","source":"Journal of neuro-oncology","url":"https://pubmed.ncbi.nlm.nih.gov/27422127","citation_count":27,"is_preprint":false},{"pmid":"30108448","id":"PMC_30108448","title":"Upregulation of miR-582-5p regulates cell proliferation and apoptosis by targeting AKT3 in human endometrial carcinoma.","date":"2018","source":"Saudi journal of biological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/30108448","citation_count":27,"is_preprint":false},{"pmid":"33506036","id":"PMC_33506036","title":"Downregulation of microRNA-15b-5p Targeting the Akt3-Mediated GSK-3β/β-Catenin Signaling Pathway Inhibits Cell Apoptosis in Parkinson's Disease.","date":"2021","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/33506036","citation_count":26,"is_preprint":false},{"pmid":"28442992","id":"PMC_28442992","title":"Genetic Deletion of Akt3 Induces an Endophenotype Reminiscent of Psychiatric Manifestations in Mice.","date":"2017","source":"Frontiers in molecular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/28442992","citation_count":26,"is_preprint":false},{"pmid":"33673003","id":"PMC_33673003","title":"AKT3 Expression in Mesenchymal Colorectal Cancer Cells Drives Growth and Is Associated with Epithelial-Mesenchymal Transition.","date":"2021","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/33673003","citation_count":25,"is_preprint":false},{"pmid":"32970816","id":"PMC_32970816","title":"Upregulation of circ_0000142 promotes multiple myeloma progression by adsorbing miR-610 and upregulating AKT3 expression.","date":"2021","source":"Journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/32970816","citation_count":25,"is_preprint":false},{"pmid":"31576144","id":"PMC_31576144","title":"LINC00565 promotes proliferation and inhibits apoptosis of gastric cancer by targeting miR-665/AKT3 axis.","date":"2019","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/31576144","citation_count":25,"is_preprint":false},{"pmid":"31297863","id":"PMC_31297863","title":"Inhibition of miR-181b-5p protects cardiomyocytes against ischemia/reperfusion injury by targeting AKT3 and PI3KR3.","date":"2019","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/31297863","citation_count":25,"is_preprint":false},{"pmid":"30136020","id":"PMC_30136020","title":"miR-320b Is Down-Regulated in Psoriasis and Modulates Keratinocyte Proliferation by Targeting AKT3.","date":"2018","source":"Inflammation","url":"https://pubmed.ncbi.nlm.nih.gov/30136020","citation_count":24,"is_preprint":false},{"pmid":"30053339","id":"PMC_30053339","title":"Akt3 deletion in mice impairs spatial cognition and hippocampal CA1 long long-term potentiation through downregulation of mTOR.","date":"2018","source":"Acta physiologica (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/30053339","citation_count":24,"is_preprint":false},{"pmid":"28064546","id":"PMC_28064546","title":"Targeting protein kinase-b3 (akt3) signaling in melanoma.","date":"2017","source":"Expert opinion on therapeutic targets","url":"https://pubmed.ncbi.nlm.nih.gov/28064546","citation_count":23,"is_preprint":false},{"pmid":"32457485","id":"PMC_32457485","title":"RHPN1-AS1 promotes cell proliferation and migration via miR-665/Akt3 in ovarian cancer.","date":"2020","source":"Cancer gene therapy","url":"https://pubmed.ncbi.nlm.nih.gov/32457485","citation_count":23,"is_preprint":false},{"pmid":"25275594","id":"PMC_25275594","title":"MicroRNA-207 enhances radiation-induced apoptosis by directly targeting Akt3 in cochlea hair cells.","date":"2014","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/25275594","citation_count":23,"is_preprint":false},{"pmid":"32453706","id":"PMC_32453706","title":"LncRNA DSCAM-AS1 promotes colorectal cancer progression by acting as a molecular sponge of miR-384 to modulate AKT3 expression.","date":"2020","source":"Aging","url":"https://pubmed.ncbi.nlm.nih.gov/32453706","citation_count":23,"is_preprint":false},{"pmid":"32524841","id":"PMC_32524841","title":"LINC02163 promotes colorectal cancer progression via miR-511-3p/AKT3 axis.","date":"2020","source":"Artificial cells, nanomedicine, and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/32524841","citation_count":22,"is_preprint":false},{"pmid":"26902608","id":"PMC_26902608","title":"Combination Therapy with AKT3 and PI3KCA siRNA Enhances the Antitumor Effect of Temozolomide and Carmustine in T98G Glioblastoma Multiforme Cells.","date":"2016","source":"BioDrugs : clinical immunotherapeutics, biopharmaceuticals and gene therapy","url":"https://pubmed.ncbi.nlm.nih.gov/26902608","citation_count":22,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51176,"output_tokens":6985,"usd":0.129152},"stage2":{"model":"claude-opus-4-6","input_tokens":10723,"output_tokens":3818,"usd":0.223598},"total_usd":0.35275,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"Akt3 knockout mice display a selective 20% decrease in brain size with smaller and fewer cells (reduced cell size and cell number), distinct from Akt1 knockout which reduces cell number only; mTOR signaling is specifically attenuated in Akt3-/- but not Akt1-/- brains, indicating isoform-specific regulation of cell growth via mTOR.\",\n      \"method\": \"Akt3 knockout mouse model with organ size measurements, cell counting, cell size analysis, and mTOR pathway activity assessment\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific cellular phenotype and pathway placement, replicated phenotype across multiple readouts\",\n      \"pmids\": [\"15713641\"],\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 kinase activation, as mutation of both to aspartate increased catalytic activity and mutation to alanine inhibited activation; the kinase is inhibited by staurosporine and Ro 31-8220.\",\n      \"method\": \"Molecular cloning, site-directed mutagenesis, in vitro kinase assay\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay with mutagenesis defining activation mechanism\",\n      \"pmids\": [\"10491192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Akt3 enzymatic activity is 20–60-fold elevated in estrogen receptor-deficient breast cancer cells and androgen-insensitive prostate cancer cells compared to hormone-responsive cells; in PTEN-null prostate cancer cells, Akt3 constitutive activity represents the dominant active Akt isoform.\",\n      \"method\": \"In vitro kinase activity assay across multiple cancer cell lines\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — enzymatic activity measured directly in multiple cell lines with isoform specificity controls\",\n      \"pmids\": [\"10419456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Membrane-targeted (myristylated) Akt3 is strongly oncogenic in chicken embryo fibroblasts, inducing multilayered foci and hemangiosarcomas in animals, with enhanced kinase activity; wild-type Akt3 is only weakly transforming, demonstrating that membrane localization and kinase activation are required for full oncogenic potential.\",\n      \"method\": \"RCAS retroviral expression in chicken embryo fibroblasts, focus formation assay, animal tumor model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro transformation assay plus in vivo tumor model with kinase activity measurements\",\n      \"pmids\": [\"11466625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Akt2-/-Akt3-/- double knockout mice survive but exhibit glucose and insulin intolerance, ~25% reduced body weight, and substantial reductions in brain and testis size, demonstrating non-redundant in vivo roles of Akt2 and Akt3 in whole-animal size and individual organ size determination.\",\n      \"method\": \"Double knockout mouse model with metabolic, weight, and organ size measurements\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with multiple defined phenotypic readouts\",\n      \"pmids\": [\"16923958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Akt3, but not Akt1, is specifically required for VEGF-induced mitochondrial biogenesis in endothelial cells; Akt3 silencing decreases mitochondrial gene expression, mtDNA content, nuclear-encoded mitochondrial gene transcripts, O2 consumption, and TOM70 expression; Akt3 knockdown causes cytoplasmic accumulation of PGC-1α (master regulator of mitochondrial biogenesis); Akt3 knockout mice show an abnormal mitochondrial phenotype in brain tissue.\",\n      \"method\": \"Akt3 gene silencing by siRNA/shRNA with comparison to Akt1 silencing, mitochondrial gene/mtDNA quantification, O2 consumption measurement, PGC-1α localization, Akt3 KO mouse tissue analysis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including in vitro silencing, in vivo KO, subcellular localization, functional readouts; isoform specificity established by direct comparison\",\n      \"pmids\": [\"18524868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Akt3 is expressed in platelets and Akt3-/- mouse platelets exhibit impaired aggregation and secretion in response to low concentrations of thrombin receptor agonists and thromboxane A2 (but not collagen or VWF); Akt3 promotes platelet activation by phosphorylating and inhibiting GSK-3β at Ser9; pharmacological rescue of GSK-3β inhibition restores Akt3-/- platelet aggregation defect; Akt3-/- mice show retarded FeCl3-induced carotid artery thrombosis in vivo.\",\n      \"method\": \"Akt3 KO mouse platelets, platelet aggregation/secretion assays, GSK-3β phosphorylation analysis, GSK-3β inhibitor rescue, in vivo thrombosis model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO model with multiple functional assays, pharmacological rescue, and in vivo validation\",\n      \"pmids\": [\"21821713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Akt3 deficiency in macrophages promotes foam cell formation and atherosclerosis; Akt3 specifically inhibits cholesteryl ester accumulation 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 KO in hyperlipidemic ApoE-/- mice, macrophage cholesteryl ester assays, lipoprotein uptake measurements, ACAT-1 protein degradation analysis with ubiquitin-proteasome pathway assessment, subcellular fractionation\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO model plus in vitro mechanistic dissection with defined pathway placement\",\n      \"pmids\": [\"22632897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Akt3 controls mitochondrial biogenesis and autophagy via regulation of CRM-1 (chromosome maintenance region-1), the major nuclear export receptor; Akt3 knockdown destabilizes CRM-1, causing PGC-1α nuclear export in a CRM-1-dependent manner; Akt3 knockdown induces autophagosome formation via a CRM-1-dependent, Akt1/mTOR-independent pathway; Akt3-null and heterozygous mice show dose-dependent decreases in angiogenesis in vivo.\",\n      \"method\": \"Akt3 knockdown, site-directed mutagenesis, co-immunoprecipitation/association analyses, autophagosome assay, PGC-1α localization, Matrigel angiogenesis assay in Akt3 KO mice\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, mechanistic dissection with mutagenesis and pathway placement, in vivo validation\",\n      \"pmids\": [\"24081905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Akt3, but not Akt1, controls VEGF secretion in ovarian cancer cells; Akt3 blockade reduces VEGF secretion and causes retention of VEGF protein in the endoplasmic reticulum; Akt3 regulates expression of Golgi protein RCAS1, which in turn controls VEGF secretion; Akt3 overexpression increases RCAS1 expression and VEGF secretion.\",\n      \"method\": \"shRNA knockdown of Akt3 vs Akt1, VEGF secretion assay, ER retention imaging, RCAS1 siRNA, xenograft mouse model\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific knockdown with mechanistic pathway placement, in vivo validation, and rescue experiments\",\n      \"pmids\": [\"21351097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Akt3 and Akt1 exert opposing roles in vascular tumor growth: Akt1 promotes and Akt3 inhibits vascular tumor growth; Akt3 inhibits tumor endothelial cell growth and migration by suppressing S6-Kinase (S6K) activation through modulation of Rictor expression; S6K in turn suppresses Akt3 expression via negative feedback.\",\n      \"method\": \"Gain- and loss-of-function of individual Akt isoforms, in vivo vascular tumor model, S6K pathway analysis, Rictor expression measurement\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific manipulation with defined pathway epistasis, in vivo validation\",\n      \"pmids\": [\"25388284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"N-cadherin expression in mammary tumor cells selectively inhibits Akt3 expression and phosphorylation, leading to increased cell motility; Akt3 knockdown increases cell motility; Akt3 overexpression inhibits motility promoted by N-cadherin, establishing Akt3 as a downstream suppressor of N-cadherin-driven cell migration.\",\n      \"method\": \"N-cadherin overexpression in PyMT and MCF-7 cells, Akt3 knockdown and overexpression, motility assays, phosphorylation analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional gain/loss-of-function with mechanistic pathway placement and rescue experiments\",\n      \"pmids\": [\"22410780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AKT3 mutations identified in megalencephaly patients all increase kinase activity as measured by ex vivo kinase assays; pleckstrin homology domain mutants (including p.E17K) exhibit enhanced phospholipid binding, explaining constitutive membrane recruitment and activation.\",\n      \"method\": \"Ex vivo kinase assays on engineered patient-mutation AKT3 constructs, phospholipid binding assay for PH domain mutants\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct kinase and phospholipid binding assays on patient mutations, with multiple mutations tested\",\n      \"pmids\": [\"28969385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Akt3 loss-of-function in mice dramatically impairs cortical Akt Ser473 phosphorylation in an allele dose-dependent manner with concomitant reduction of mTORC2 complex proteins Rictor and Sin1, identifying mTORC2 as the dominant upstream activator of Akt3 in brain and Akt3 as the primary regulator of Akt/mTOR signaling in brain.\",\n      \"method\": \"Akt3 heterozygous and null mice, western blot quantification of Akt Ser473, Rictor, and Sin1 in cortex\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — allele dose-dependent effect with mechanistic pathway dissection\",\n      \"pmids\": [\"28467426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Akt3 deficiency in adipocytes increases WNK1 protein levels (by loss of Akt3-mediated phosphorylation of WNK1 at T58 and ubiquitin-proteasome degradation), leading to SGK1 activation; SGK1 then phosphorylates and inhibits FOXO1, activating PPARγ transcription and promoting adipogenesis; pharmacological blockade of SGK1 rescues the obesity phenotype in Akt3-deficient mice.\",\n      \"method\": \"Akt3 KO mouse model, phosphorylation site identification (WNK1 T58), ubiquitin-proteasome pathway analysis, SGK1 inhibitor treatment in vivo, adipogenesis assays\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO model with defined substrate (WNK1 T58), pathway epistasis, and pharmacological rescue in vivo\",\n      \"pmids\": [\"29202451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PPAR-γ overexpression drives increased AKT3 expression; AKT3 promotes nuclear localization of PGC-1α by inhibiting CRM1 (nuclear export protein), driving mitochondrial biogenesis and elevated ATP production that fuels epithelial-to-mesenchymal transition in prostate cancer.\",\n      \"method\": \"PPAR-γ overexpression, AKT3 expression analysis, PGC-1α nuclear localization assay, CRM1 inhibition experiments, mitochondrial mass and ATP measurements\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway placement with subcellular localization data; single lab study\",\n      \"pmids\": [\"33654198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AKT3 knockdown in triple-negative breast cancer cells increases migration in vitro, which is mediated by upregulation of S100A4 protein; siRNA knockdown of S100A4 reverses the increased migration caused by AKT3 depletion; combined AKT2/AKT3 or AKT1/AKT3 depletion increases metastasis in vivo, establishing AKT3 as an isoform-specific suppressor of migration/metastasis acting through S100A4.\",\n      \"method\": \"isoform-specific shRNA knockdown, live-cell imaging and transwell migration assays, S100A4 siRNA rescue, in vivo xenograft metastasis model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific KD, mechanistic rescue experiment, and in vivo validation\",\n      \"pmids\": [\"26741489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AKT3 upregulation in breast cancer cells confers resistance to the allosteric AKT inhibitor MK2206; knockdown of AKT3 (but not AKT1 or AKT2) in resistant cells restores MK2206 sensitivity; AKT3 induction in resistant cells is regulated epigenetically by bromodomain and extra terminal domain (BET) proteins.\",\n      \"method\": \"Step-wise drug resistance model, isoform-specific siRNA knockdown, BET inhibitor treatment, cell viability assays\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific rescue experiment with epigenetic mechanism identified\",\n      \"pmids\": [\"27297869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Akt3 deletion in mice reduces GSK3α/β phosphorylation at Ser21/9 in multiple brain regions; this leads to behavioral phenotypes resembling schizophrenia, anxiety, and depression; chronic lithium treatment (which inhibits GSK3) restores GSK3α/β phosphorylation and rescues the behavioral deficits, placing GSK3 phosphorylation as a key downstream mechanism of Akt3 in psychiatric-relevant behavior.\",\n      \"method\": \"Akt3 KO mice, western blot of p-GSK3α/β, behavioral test battery, lithium rescue treatment\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO model with defined substrate phosphorylation changes, pharmacological rescue\",\n      \"pmids\": [\"28442992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Akt3 deficiency in mice impairs protein synthesis-dependent long-LTP (HFS×4-induced) and long-term spatial memory; Akt3 KO reduces basal mTOR phosphorylation; HFS×4 fails to trigger mTOR-p70S6K signaling cascade or increase 4EBP2/eIF4E phosphorylation in Akt3 KO mice, indicating Akt3 regulates protein synthesis-dependent plasticity via mTOR-p70S6K pathway.\",\n      \"method\": \"Akt3 KO mice, Morris water maze, electrophysiological LTP recordings, western blot of mTOR/p70S6K/4EBP2/eIF4E pathway components\",\n      \"journal\": \"Acta physiologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO model with electrophysiology and defined molecular pathway; multiple readouts\",\n      \"pmids\": [\"30053339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AKT3 overexpression increases total AKT, phospho-AKT (S473 and T308), B-Raf, and downstream mTOR/p70S6K signaling while decreasing TSC1 and TSC2 proteins in prostate cancer cells; AKT3 knockdown sensitizes cells to B-Raf inhibitor treatment.\",\n      \"method\": \"Plasmid overexpression and siRNA knockdown of AKT3 in prostate cancer cell lines, western blot pathway analysis, drug sensitivity assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, overexpression/knockdown with western blot pathway analysis without direct substrate assay\",\n      \"pmids\": [\"26318033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Akt3 specifically controls embryonic stem cell survival and proliferation; Akt3 inhibition causes nuclear accumulation of p53 and activation of downstream targets Mdm2, p21, and Fas; inhibiting p53 and its downstream targets partially rescues the effects of Akt3 depletion, identifying the Akt3-p53 axis as isoform-specific in ESC survival.\",\n      \"method\": \"Akt3 knockdown in mouse ESCs, p53 nuclear localization (western/fractionation), p53 inhibitor rescue, cell cycle and apoptosis assays\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific KD with mechanistic pathway, rescue experiments; single lab\",\n      \"pmids\": [\"28483982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"M2-polarized tumor-associated macrophages activate the AKT3/PRAS40 signaling pathway in cholangiocarcinoma cells (via secreted cytokines), promoting EMT; AKT3 silencing (but not AKT1 or AKT2 silencing) markedly inhibits phosphorylation of AKT and PRAS40 and inhibits EMT in co-culture with M2-TAMs.\",\n      \"method\": \"Macrophage-cancer cell co-culture, isoform-specific AKT siRNA knockdown, p-AKT and p-PRAS40 western blot, EMT marker analysis\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — isoform-specific siRNA with functional readout; single lab, limited mechanistic depth\",\n      \"pmids\": [\"31692069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Akt3-mediated protection against inflammatory demyelinating disease is specifically mediated by Akt3 in CD4+ T-cells (not neurons); conditional deletion of Akt3 in CD4+ T-cells worsens EAE, decreases FOXP3+ Treg cells, and increases CNS inflammation; enhanced Akt3 kinase activity increases FOXP3+ iTreg differentiation efficiency.\",\n      \"method\": \"Cell-type specific conditional Akt3 knockout mice (CD4-CKO and Syn1-CKO), EAE model, FOXP3 expression, flow cytometry\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type specific conditional KO with defined phenotypic readout and mechanism (iTreg differentiation)\",\n      \"pmids\": [\"31404142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"IL-13 suppresses MMP-13 expression in human dermal fibroblasts via the PI3K/Akt3 pathway; Akt3-specific siRNA knockdown upregulates MMP-13 in IL-13-treated fibroblasts, indicating Akt3 negatively controls MMP-13 expression downstream of IL-13/PI3K signaling.\",\n      \"method\": \"Akt3-specific siRNA knockdown, cDNA microarray, MMP-13 mRNA and protein measurement, PI3K inhibitor treatment\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — isoform-specific siRNA with functional readout; single lab study\",\n      \"pmids\": [\"21191416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In malignant glioma cells, Akt2 and Akt3 (not Akt1) knockdown reduces phosphorylated Bad and induces caspase-dependent apoptosis; overexpression of Akt2 or Akt3 cross-suppresses expression of the other isoform; endogenous Akt3 shows high kinase activity in U87MG cells.\",\n      \"method\": \"Isoform-specific RNA interference and plasmid overexpression in glioma cell lines, Bad phosphorylation analysis, caspase-dependent apoptosis assay, kinase activity measurement\",\n      \"journal\": \"Neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific KD with mechanistic readout (Bad phosphorylation, caspase activation); single lab\",\n      \"pmids\": [\"20167810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AKT3 controls expression of the cell cycle regulator p27KIP1 in CMS4 mesenchymal colorectal cancer cells; chemical inhibition or knockout of AKT3 hampers CMS4 cell outgrowth by regulating p27KIP1 levels; high AKT3 expression is associated with high EMT gene expression.\",\n      \"method\": \"AKT3 CRISPR knockout and chemical inhibition in CMS4 CRC cell lines and PDX models, p27KIP1 protein quantification, in vitro and in vivo growth assays\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined substrate (p27KIP1), single lab\",\n      \"pmids\": [\"33673003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Isoform-selective AKT3 PROTAC degrader (12l) induces proteasomal degradation of AKT3 but not AKT1/2 in vitro and in vivo; selective AKT3 degradation suppresses growth of osimertinib-resistant NSCLC cells, validating a non-canonical, AKT3-specific survival function in drug-resistant cells.\",\n      \"method\": \"PROTAC-mediated targeted protein degradation, isoform selectivity profiling, cell viability assays, in vivo xenograft model\",\n      \"journal\": \"Journal of medicinal chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — selective degradation tool with in vitro and in vivo validation of isoform-specific function\",\n      \"pmids\": [\"36173763\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AKT3 is a serine/threonine kinase activated by phosphorylation at Thr305 and Ser472 downstream of PI3K/mTORC2 signaling that plays isoform-specific roles in brain size determination (via mTOR-dependent cell growth), mitochondrial biogenesis (via CRM-1-dependent PGC-1α nuclear retention), platelet activation (via GSK-3β phosphorylation at Ser9), macrophage cholesterol metabolism (via ACAT-1 ubiquitin-proteasome degradation), adipogenesis suppression (via WNK1 T58 phosphorylation and SGK1/FOXO1 pathway), vascular tumor suppression (via Rictor/S6K modulation), T-cell-mediated neuroprotection (by promoting FOXP3+ iTreg differentiation), and cancer cell migration suppression (via S100A4 regulation), with activating mutations causing constitutive PI3K pathway signaling underlying megalencephaly syndromes.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"AKT3 is a PI3K/mTORC2-activated serine/threonine kinase that functions as the dominant AKT isoform in the brain and exerts non-redundant, tissue-specific roles in cell growth, mitochondrial biogenesis, lipid metabolism, immune regulation, and platelet activation. AKT3 is activated by phosphorylation at Thr305 and Ser472, with mTORC2 serving as its principal upstream activator in cortex, and signals through mTOR/p70S6K to control brain size, cell number, cell size, and protein synthesis–dependent synaptic plasticity; loss of Akt3 in mice causes selective microcephaly, impaired long-term potentiation, and psychiatric-relevant behavioral deficits rescued by GSK-3 inhibition [PMID:15713641, PMID:30053339, PMID:28442992, PMID:28467426]. In non-neuronal contexts, AKT3 promotes mitochondrial biogenesis by stabilizing CRM-1 to retain PGC-1α in the nucleus, suppresses adipogenesis by phosphorylating WNK1 at T58 to target it for proteasomal degradation, limits macrophage foam cell formation by degrading ACAT-1 via the ubiquitin–proteasome pathway, promotes FOXP3+ iTreg differentiation in CD4+ T cells, and facilitates platelet activation through GSK-3β Ser9 phosphorylation [PMID:24081905, PMID:29202451, PMID:22632897, PMID:31404142, PMID:21821713]. Activating AKT3 mutations—including PH-domain variants with enhanced phospholipid binding—cause constitutive PI3K/AKT pathway signaling and underlie megalencephaly syndromes [PMID:28969385].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Defining AKT3's activation mechanism resolved whether this third AKT isoform used the same phosphorylation-dependent switch as AKT1/2: phosphorylation at both Ser472 and Thr305 is required for full catalytic activation, and constitutively elevated AKT3 activity was found to dominate in PTEN-null and hormone-insensitive cancer cells.\",\n      \"evidence\": \"Molecular cloning, site-directed mutagenesis with in vitro kinase assays, and kinase activity profiling across cancer cell panels\",\n      \"pmids\": [\"10491192\", \"10419456\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream kinase(s) responsible for each phosphorylation site not yet identified in this work\", \"No structural basis for isoform-selective activation\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing that membrane recruitment converts AKT3 from weakly transforming to strongly oncogenic demonstrated that subcellular localization gates its kinase-dependent oncogenicity.\",\n      \"evidence\": \"Myristylated vs. wild-type AKT3 retroviral expression in chicken embryo fibroblasts; focus formation and hemangiosarcoma induction in vivo\",\n      \"pmids\": [\"11466625\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous membrane-targeting mechanism not defined\", \"Identity of critical substrates mediating transformation unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The discovery that Akt3 knockout mice have selectively smaller brains—with both reduced cell size and number, and attenuated mTOR signaling—established AKT3 as a non-redundant, isoform-specific regulator of brain growth acting through the mTOR pathway.\",\n      \"evidence\": \"Akt3 KO mouse model with brain size, cell number, cell size, and mTOR pathway activity measurements\",\n      \"pmids\": [\"15713641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific mTOR effectors mediating cell size vs. cell number effects not separated\", \"Developmental timing of AKT3 requirement not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Akt2/Akt3 double knockout mice demonstrated that AKT3 has non-redundant whole-organism roles beyond the brain, contributing to body weight, testis size, and metabolic homeostasis.\",\n      \"evidence\": \"Double KO mouse model with metabolic and organ measurements\",\n      \"pmids\": [\"16923958\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of Akt2 vs. Akt3 to metabolic phenotypes not individually resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of AKT3 as selectively required for VEGF-induced mitochondrial biogenesis in endothelial cells—and its regulation of PGC-1α nuclear retention—revealed a novel isoform-specific function in organelle biogenesis distinct from canonical AKT survival signaling.\",\n      \"evidence\": \"Akt3 vs. Akt1 siRNA/shRNA in endothelial cells, mtDNA/O₂ consumption quantification, PGC-1α localization, Akt3 KO mouse brain mitochondria\",\n      \"pmids\": [\"18524868\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which AKT3 retains PGC-1α in the nucleus not yet defined\", \"Direct AKT3 substrate linking kinase activity to mitochondrial gene program unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Two studies established context-dependent roles: AKT3 promotes platelet activation by phosphorylating GSK-3β at Ser9, while in ovarian cancer it isoform-specifically controls VEGF secretion via RCAS1/Golgi-dependent trafficking.\",\n      \"evidence\": \"Akt3 KO mouse platelets with aggregation assays and GSK-3β inhibitor rescue; isoform-specific shRNA in ovarian cancer with VEGF secretion and ER retention imaging\",\n      \"pmids\": [\"21821713\", \"21351097\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AKT3 activates RCAS1 expression mechanistically unknown\", \"Platelet AKT3 substrate specificity beyond GSK-3β not explored\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"AKT3 was shown to restrict macrophage foam cell formation by promoting ACAT-1 ubiquitin-proteasome degradation, and separately to suppress N-cadherin–driven breast cancer cell migration, consolidating its role as a cell-type–specific negative regulator in both atherosclerosis and metastasis.\",\n      \"evidence\": \"Akt3 KO in ApoE−/− mice with macrophage cholesterol/ACAT-1 degradation assays; N-cadherin/Akt3 bidirectional manipulation in mammary tumor cells with motility assays\",\n      \"pmids\": [\"22632897\", \"22410780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphorylation target linking AKT3 to ACAT-1 ubiquitination not identified\", \"N-cadherin mechanism of AKT3 transcriptional/translational suppression unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of CRM-1 stabilization as the mechanism by which AKT3 retains PGC-1α in the nucleus resolved how AKT3 controls mitochondrial biogenesis, and revealed a CRM-1–dependent, mTOR-independent autophagy pathway.\",\n      \"evidence\": \"Akt3 knockdown with CRM-1 protein stability analysis, PGC-1α nuclear export assay, autophagosome quantification, Matrigel angiogenesis in Akt3 KO mice\",\n      \"pmids\": [\"24081905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AKT3 directly phosphorylates CRM-1 or acts indirectly not resolved\", \"Autophagy pathway downstream effectors not identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"AKT3 was established as an isoform-specific suppressor of breast cancer cell migration acting through S100A4, with combined AKT isoform depletion increasing metastasis in vivo.\",\n      \"evidence\": \"Isoform-specific shRNA, S100A4 siRNA rescue of migration, in vivo xenograft metastasis model\",\n      \"pmids\": [\"26741489\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AKT3 loss upregulates S100A4 protein mechanistically unknown\", \"Whether S100A4 is a direct or indirect target not determined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Multiple 2017 studies converged to define AKT3's upstream activation and disease relevance: mTORC2 (Rictor/Sin1) was identified as the dominant upstream activator in brain, megalencephaly-associated mutations were shown to constitutively activate kinase activity (PH domain mutants via enhanced phospholipid binding), and AKT3 was linked to adipogenesis suppression by phosphorylating WNK1 at T58.\",\n      \"evidence\": \"Allele dose-dependent Rictor/Sin1 reduction in Akt3 KO cortex; ex vivo kinase and phospholipid binding assays on patient mutations; Akt3 KO adipocyte model with WNK1 T58 phosphorylation, SGK1 inhibitor rescue in vivo\",\n      \"pmids\": [\"28467426\", \"28969385\", \"29202451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for PH domain mutation-driven phospholipid selectivity not solved\", \"Whether mTORC2 dependence extends to non-brain tissues not tested\", \"WNK1 T58 phosphorylation not confirmed as direct in reconstituted system\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"AKT3's neurological roles were extended to synaptic plasticity and behavior: Akt3 KO impairs protein synthesis–dependent LTP via mTOR/p70S6K/4EBP2 and produces psychiatric-like behaviors rescued by lithium-mediated GSK-3 inhibition.\",\n      \"evidence\": \"Akt3 KO mice with electrophysiological LTP recordings, Morris water maze, p-mTOR/p-p70S6K/p-4EBP2 western blots; behavioral battery with lithium rescue and GSK-3α/β phosphorylation analysis\",\n      \"pmids\": [\"30053339\", \"28442992\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LTP and behavioral phenotypes share a single downstream mechanism or represent parallel pathways unclear\", \"Cell-type specificity of AKT3 function in adult brain circuits not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Cell-type–specific conditional knockout revealed that AKT3 protects against neuroinflammation by promoting FOXP3+ iTreg differentiation specifically in CD4+ T cells, not neurons, resolving the cellular origin of AKT3-dependent neuroprotection.\",\n      \"evidence\": \"CD4-Cre and Syn1-Cre conditional Akt3 KO mice in EAE model, FOXP3 flow cytometry\",\n      \"pmids\": [\"31404142\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct substrate linking AKT3 kinase activity to FOXP3 induction not identified\", \"Whether this mechanism operates in other autoimmune contexts untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Development of an AKT3-selective PROTAC degrader validated that AKT3 protein, specifically, sustains survival signaling in drug-resistant NSCLC, confirming isoform-selective dependency.\",\n      \"evidence\": \"PROTAC-mediated selective AKT3 degradation with isoform selectivity profiling, cell viability, and in vivo xenograft\",\n      \"pmids\": [\"36173763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AKT3-specific substrates mediating drug resistance not identified\", \"Whether selective AKT3 degradation has therapeutic utility in other resistance contexts unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis for AKT3 isoform selectivity toward its substrates, the identity of direct phosphorylation targets mediating CRM-1 stabilization and ACAT-1 degradation, and whether the diverse tissue-specific functions reflect distinct substrate repertoires or context-dependent signaling scaffolds.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of AKT3 in complex with isoform-specific substrates\", \"Direct kinase–substrate relationships for CRM-1, ACAT-1, and S100A4 regulation unresolved\", \"Systems-level substrate atlas comparing AKT1/2/3 phosphoproteomes lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 6, 12, 14]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 7]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 12]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 12, 13, 19]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [5, 8, 15]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [23]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [25]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [7, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"GSK3B\",\n      \"WNK1\",\n      \"PGC1A\",\n      \"CRM1\",\n      \"RICTOR\",\n      \"ACAT1\",\n      \"S100A4\",\n      \"PRAS40\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}