{"gene":"GSK3A","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2013,"finding":"GSK-3α is a critical regulator of mTORC1 and autophagy; global Gsk3a knockout mice show marked activation of mTORC1 and suppression of autophagy markers, and pharmacologic inhibition or gene deletion of Gsk3a suppresses autophagy in fibroblasts. mTOR inhibition rescued both the autophagy defect and established muscle pathologies in KO mice, placing GSK-3α upstream of mTORC1 in this pathway.","method":"Global Gsk3a knockout mouse, pharmacologic inhibition, mTOR inhibitor rescue, autophagy marker analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and pharmacologic rescue experiments, multiple orthogonal readouts in vivo and in vitro, replicated by both KO and inhibitor approaches","pmids":["23549082"],"is_preprint":false},{"year":2015,"finding":"GSK3A is essential for sperm motility and male fertility in mice; targeted Gsk3a knockout causes impaired flagellar waveform, reduced sperm ATP levels, elevated PP1γ2 catalytic activity, and absence of capacitation-associated tyrosine phosphorylation. GSK3B cannot substitute for GSK3A in this context, demonstrating isoform-specific function.","method":"Targeted gene knockout mouse, sperm motility parameters, ATP assay, PP1γ2 activity assay, tyrosine phosphorylation analysis","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with multiple defined cellular phenotypes, isoform specificity confirmed by persistence of GSK3B without rescue","pmids":["25568307"],"is_preprint":false},{"year":2012,"finding":"GSK-3α and GSK-3β function redundantly in early chondrocyte differentiation via phosphorylation of RelA (NF-κB p65) at Thr-254; compound knockout (Gsk3a−/−;Gsk3b+/−) causes dwarfism and impaired chondrocyte differentiation, and computational/transcriptional assays identified Thr-254 as the critical GSK-3 phosphorylation site on RelA for this process.","method":"Compound mouse knockout, SOX9 and COL2A1 transcriptional assays, computational prediction, phosphorylation site identification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with two isoforms, specific phosphorylation site identified, multiple transcriptional readouts in one study","pmids":["22761446"],"is_preprint":false},{"year":2021,"finding":"GSK3A phosphorylates the SARS-CoV-2 nucleocapsid (N) protein; GSK3A and GSK3B double knockout abolishes N protein phosphorylation, and GSK-3 inhibitors block N phosphorylation and impair SARS-CoV-2 replication in lung epithelial cells.","method":"GSK3A/GSK3B knockout cells, in vitro kinase assay, GSK-3 inhibitor treatment, viral replication assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus pharmacologic inhibition plus direct phosphorylation assay, peer-reviewed","pmids":["34593624"],"is_preprint":false},{"year":2017,"finding":"GSK-3 (including GSK3A) phosphorylates multiple splicing factors including RBM8A, SRSF9, and PSF, as well as nucleolar proteins NPM1 and PHF6; comparison of WT and Gsk3a;Gsk3b double-KO ES cells by SILAC phosphoproteomics revealed prominent GSK-3-dependent phosphorylation of these substrates, and recombinant GSK-3β phosphorylated them in vitro. GSK-3 DKO altered alternative splicing of ~190 genes.","method":"SILAC phosphoproteomics, Gsk3a;Gsk3b double-KO mouse ES cells, in vitro kinase assay, RNA-Seq","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase reconstitution plus unbiased phosphoproteomics in KO cells, multiple orthogonal methods in one study","pmids":["28916722"],"is_preprint":false},{"year":2010,"finding":"PKA, PKC, and PI3K pathways regulate GSK3A Ser21 phosphorylation (inactivation) in boar spermatozoa to control motility; cAMP/8Br-cAMP increases Ser21 phosphorylation coincident with increased motility, effects blocked by PKA inhibitor H89 or PKC inhibitor Ro-32-0432. PI3K inhibition increases basal GSK3A phosphorylation via an intracellular cAMP/PKA-dependent mechanism.","method":"Pharmacologic inhibition of PKA (H89), PKC (Ro-32-0432), PI3K (LY294002), Western blot for pSer21-GSK3A, sperm motility assay","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pathway inhibitors with orthogonal readouts in a single study, single lab","pmids":["19911376"],"is_preprint":false},{"year":2006,"finding":"SGK1 and PKB phosphorylate GSK3A at Ser21 in HEK293 cells; overexpression of wild-type and constitutively active SGK1, but not catalytically inactive SGK1, increased GSK3α/β phosphorylation. DOCA/high-salt treatment of mice induced cardiac GSK3α phosphorylation (less robustly than GSK3β).","method":"HEK293 overexpression with wild-type, constitutively active, and kinase-inactive SGK1; Western blot for pSer21; in vivo DOCA/salt mouse model","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — catalytically inactive mutant controls establish kinase requirement; in vivo corroboration; single lab","pmids":["16543730"],"is_preprint":false},{"year":2010,"finding":"GSK3A and GSK3B are identified as in vitro substrates of themselves and as interactors with DEAF1 transcription factor via yeast two-hybrid and co-affinity purification; GSK3 inhibitors increase DEAF1 transcriptional activity on the 5-HT1A serotonin receptor promoter.","method":"Yeast two-hybrid screen, co-affinity purification, in vitro kinase assay, transcriptional reporter assay","journal":"Molecular & cellular proteomics : MCP","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal biochemical validation (Y2H + co-AP + in vitro assay + reporter), single lab","pmids":["20368287"],"is_preprint":false},{"year":2012,"finding":"GSK-3α silencing (but not GSK-3β silencing) reduces androgen receptor (AR) transcriptional activity in 22Rv1 prostate cancer cells; silencing of either isoform reduces colony formation. GSK-3β silencing but not GSK-3α silencing reduced Akt phosphorylation, demonstrating distinct isoform-specific signaling roles.","method":"siRNA gene silencing, AR transcriptional activity assay, colony formation assay, Western blot for pAkt","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific siRNA knockdown with multiple functional readouts; single lab","pmids":["22539113"],"is_preprint":false},{"year":2017,"finding":"Loss of GSK3A expression (via CRISPR KO) in AML cells confers resistance to FLT3 inhibitor AC220 by reactivating Wnt signaling, and SPRY3 expression is positioned downstream of GSK3A in this resistance pathway.","method":"Genome-wide CRISPR screen, GSK3A KO validation in AML cell lines and primary patient samples, Wnt signaling pathway analysis","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with defined signaling readouts and epistasis (SPRY3 downstream of GSK3A); validated in primary samples; single lab","pmids":["28625976"],"is_preprint":false},{"year":2019,"finding":"GSK-3 (including GSK3A) activity is negatively correlated with human sperm motility in an isoform-specific manner: inhibited (Ser-phosphorylated) GSK3A correlates strongly with progressive motility (r=0.822, p=0.023), whereas inhibited GSK3B does not. GSK3A interactors in sperm were identified by yeast two-hybrid and co-immunoprecipitation.","method":"Correlative analysis of GSK3 phosphorylation vs. motility in normospermic and asthenozoospermic samples, yeast two-hybrid, co-immunoprecipitation","journal":"Molecular human reproduction","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — correlative biochemical data plus co-IP interactome; isoform specificity established in human samples; single lab","pmids":["30824926"],"is_preprint":false},{"year":2019,"finding":"GSK3A/B inhibit ALDH1A2 (retinoic acid synthetic enzyme) expression via Wnt/β-catenin signaling in fetal kidney cells; CHIR99021 represses ALDH1A2, this effect is abolished when β-catenin is inhibited, and ChIP shows β-catenin recruitment to the ALDH1A2 promoter.","method":"GSK3A/B inhibitor (CHIR99021), β-catenin knockdown, ChIP, luciferase reporter assay","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacologic epistasis with ChIP confirmation; single lab, multiple orthogonal methods","pmids":["32258025"],"is_preprint":false},{"year":2019,"finding":"GSK3A and GSK3B are required for cerebellar granule neuron progenitor (CGNP) proliferation driven by SHH signaling; co-deletion of Gsk3a and Gsk3b blocks proliferation and causes severe cerebellar hypoplasia. Ctnnb1 co-deletion rescues hypoproliferation in Gsk3a/b mutants, demonstrating the GSK-3 effect is mediated through WNT/β-catenin. Co-deletion also blocks SHH-driven medulloblastoma growth.","method":"Conditional double Gsk3a/Gsk3b KO mice, Ctnnb1 genetic rescue, transcriptomic analysis, SmoM2 medulloblastoma model","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional double KO with genetic epistasis rescue by Ctnnb1 deletion, multiple phenotypic readouts in vivo","pmids":["31540917"],"is_preprint":false},{"year":2021,"finding":"GSK3A-specific (Gsk3aΔ) neuronal knockout mice do not show resistance to MPTP-induced dopaminergic neurodegeneration, whereas Gsk3bΔ mice do; this establishes non-redundancy between isoforms in Parkinsonian neurodegeneration, with GSK3α dispensable for this process.","method":"Dopaminergic neuron-specific conditional Gsk3a KO and Gsk3b KO mice, MPTP model, dopaminergic neuron counting","journal":"Frontiers in molecular neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — parallel isoform-specific conditional KO models with direct neuronal count readout; establishes negative result for GSK3α","pmids":["32581704"],"is_preprint":false},{"year":2021,"finding":"GSK-3α contributes to T cell-mediated tumor rejection in a non-redundant manner with GSK-3β; Gsk3b−/− mice suppress tumor growth equivalently to Gsk3a/b double KO, whereas Gsk3a−/− behaves like wild-type. Both isoforms differentially regulate PD-1, IFNγ, and granzyme B expression and synergize to control PD-1 levels and CD4/CD8 T cell tumor infiltration.","method":"Conditional T cell-specific Gsk3a and Gsk3b KO mice, tumor growth assays, flow cytometry for PD-1/IFNγ/granzyme B","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Strong — parallel conditional single and double KO with multiple immune readouts; clear isoform dissection","pmids":["34142056"],"is_preprint":false},{"year":2014,"finding":"GSK3A silencing abolishes growth of p53-null colon carcinoma cells after DNA-damaging chemotherapy by impairing DNA repair, enabling a necroptotic response (RIP1-independent, PARP-dependent AIF nuclear re-localization without caspase activation); GSK3A is redundant with GSK3B in this drug resistance mechanism.","method":"siRNA silencing of GSK3A/GSK3B, DNA damage assays, caspase activity, AIF localization, PARP inhibition","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — parallel isoform knockdowns with defined cell death mechanism; single lab, multiple orthogonal readouts","pmids":["24984063"],"is_preprint":false},{"year":2014,"finding":"GSK3α deficiency in macrophages increases IL-10 production in response to endoplasmic reticulum stress; Gsk3a KO in LDLR-deficient mice attenuates atherosclerosis and hepatic steatosis, associated with elevated plasma IL-10 and enhanced ER stress-induced IL-10 in macrophages treated with GSK3α/β inhibitor CT99021.","method":"Gsk3a KO crossed with LDLR KO mice, high-fat diet model, macrophage IL-10 assay, CT99021 pharmacologic inhibition","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO with pharmacologic corroboration, defined IL-10 mechanism; single lab","pmids":["25451156"],"is_preprint":false},{"year":2016,"finding":"GSK-3α is a direct transcriptional target of CREB in lung cancer cells; CREB knockdown reduces GSK3A expression, and CREB binds directly to the GSK3A promoter as shown by ChIP. GSK-3α inhibition suppresses cell viability, colony formation, and tumor growth in lung cancer.","method":"CREB siRNA knockdown, ChIP of CREB on GSK3A promoter, GSK-3α inhibition with loss-of-function assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishes direct promoter binding; loss-of-function phenotype confirmed; single lab","pmids":["27049759"],"is_preprint":false},{"year":2019,"finding":"GSK3A and GSK3B phosphorylate MTHFR (methylenetetrahydrofolate reductase) at multiple N-terminal sites in vitro and in cells; CRISPR knockin of phospho-null MTHFR mutants showed that phosphorylation enhances SAM-dependent allosteric inhibition and controls one-carbon metabolism.","method":"In vitro kinase assay with GSK3A/B, CRISPR knockin phospho-null mutants, 5-methyl-THF production assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus CRISPR knockin functional confirmation; single lab","pmids":["30862944"],"is_preprint":false},{"year":2023,"finding":"Genetic or chemical inhibition of GSK3A leads to increased long-range chromatin looping interactions in a genome-wide and cohesin-dependent manner, implicating GSK3A in the regulation of nuclear architecture.","method":"HiDRO high-throughput Oligopaint imaging screen, GSK3A genetic inhibition, cohesin-dependence validation","journal":"Nature","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — validated hit from functional screen with cohesin epistasis; single lab study","pmids":["37438531"],"is_preprint":false},{"year":2022,"finding":"GSK3A-specific neuronal deletion (Camk2a-Cre driven Gsk3a KO) in adult mice enhances long-term potentiation (LTP) in CA1 hippocampal neurons without affecting basal synaptic function; deletion of Gsk3b does not produce this effect, demonstrating a unique postsynaptic role of GSK3α in limiting LTP.","method":"Conditional CaMK2a-Cre Gsk3a KO and Gsk3b KO mice, hippocampal slice electrophysiology, LTP measurement","journal":"Frontiers in molecular neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — parallel conditional isoform-specific KO with direct electrophysiological readout; isoform specificity clearly established","pmids":["35782378"],"is_preprint":false},{"year":2024,"finding":"Gsk3a promotes immune evasion in hepatocellular carcinoma by inducing neutrophil chemotaxis and neutrophil extracellular trap (NET) formation through the intermediate molecule LRG1, which suppresses cytotoxic T lymphocyte (CTL) function; identified by CRISPR screening in immunocompetent vs. immune-deficient mice.","method":"CRISPR in vivo screen, flow cytometry for immune infiltration, RNA sequencing of neutrophils, Gsk3a KO in HCC model","journal":"Journal for immunotherapy of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with defined immune mechanism and LRG1 pathway; single lab","pmids":["39174053"],"is_preprint":false},{"year":2025,"finding":"GSK3A promotes human adenovirus B7 (HAdV-B7) replication through its kinase activity; kinase-active S21A mutant enhances, while kinase-inactive Y279A and K148A mutants fail to support, viral replication. GSK3A phosphorylates the viral L4-22K protein at S78 and S81 via direct interaction between GSK3A's kinase domain and residues 92-168 of L4-22K.","method":"cDNA gain-of-function screen, GSK3A overexpression/KO/KD, kinase-dead mutants, phosphoproteomics, co-immunoprecipitation, structural modeling and truncation assays","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro/cellular kinase assay with active-site mutagenesis, co-IP, phosphoproteomics, and domain mapping in one rigorous study","pmids":["40537285"],"is_preprint":false},{"year":2019,"finding":"SARS-CoV-2 nucleocapsid R203K/G204R mutant protein shows increased interaction with GSK3A kinase simultaneously with hyper-phosphorylation of adjacent serine site S206, as revealed by comparative biochemical analysis of mutant versus wild-type N protein.","method":"Comparative biochemical analysis, co-immunoprecipitation with GSK3A, phosphorylation site mapping","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical interaction and phosphorylation assay; single study","pmids":["35105893"],"is_preprint":false},{"year":2024,"finding":"GSK3A was validated as a direct binding target of quercetin by CETSA-MS, Western blot, molecular docking, site-directed mutagenesis, and pull-down assays, showing that quercetin stabilizes GSK3A protein in cells.","method":"CETSA-MS proteomics, Western blot, molecular docking, site-directed mutagenesis, pull-down assay","journal":"European journal of medicinal chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal target validation methods including mutagenesis; single lab","pmids":["38342014"],"is_preprint":false},{"year":2017,"finding":"GSK3A was confirmed as a MYC-interacting protein in live cancer cells using NanoLuc-based protein-fragment complementation assay (NanoPCA), with interaction validated by co-immunoprecipitation of endogenous proteins.","method":"NanoPCA protein-fragment complementation assay, co-immunoprecipitation of endogenous proteins","journal":"Molecular pharmacology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — reciprocal co-IP confirms interaction; single lab","pmids":["28087810"],"is_preprint":false},{"year":2021,"finding":"GSK3A KO combined with inducible GSK3B shRNA knockdown in Merkel cell carcinoma (MCC) cells suppresses T-antigen (TA) transcription and MCC cell growth; individual GSK3A KO alone confirmed involvement of GSK3A in TA expression regulation.","method":"GSK3A CRISPR KO, inducible GSK3B shRNA, TA expression analysis, MCC xenograft model","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with functional phenotype and in vivo validation; single lab","pmids":["34715251"],"is_preprint":false},{"year":2022,"finding":"MYCT1 promotes translation of GSK3A (along with PGM1 and UGP2) in hepatic cells via a RACK1-dependent mechanism; global Myct1 inactivation in mice leads to progressive hepatic glycogen accumulation and reduced GSK3A protein, establishing GSK3A as a translationally regulated component of the glycogen shunt.","method":"Global Myct1 KO mice, liver glycogen assay, RACK1-dependent translation analysis, Western blot","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO with mechanistic pathway placement; single lab","pmids":["35281731"],"is_preprint":false},{"year":2021,"finding":"GSK3A activity is abnormally elevated during sperm cryopreservation and is identified as the key kinase regulating sperm motility-associated phosphorylation; a GSK3A-centric phosphorylation network was constructed from quantitative phosphoproteomics of fresh vs. cryopreserved sperm.","method":"Quantitative phosphoproteomics, kinase enrichment analysis, Western blot for GSK3A activation state","journal":"Bioscience reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — phosphoproteomics-based inference with kinase enrichment; direct mechanistic validation of specific substrates limited","pmids":["34596222"],"is_preprint":false},{"year":2024,"finding":"CCDC28A interacts with GSK3A in sperm (co-immunoprecipitation), and Ccdc28a KO mice show sperm phenotypes overlapping with those of Gsk3a-deficient mice (bent sperm heads, acrosomal defects, reduced motility).","method":"Co-immunoprecipitation, Ccdc28a KO mouse, sperm morphology and motility analysis","journal":"Cellular and molecular life sciences : CMLS","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP demonstrates interaction; phenotypic overlap is indirect evidence for functional connection","pmids":["38597936"],"is_preprint":false},{"year":2025,"finding":"GSK3A (together with GSK3B) functions within the β-catenin destruction complex to phosphorylate β-catenin, promoting its degradation; HUWE1 antagonizes this activity to enhance WNT signaling. In cells lacking CSNK1A1, a residual destruction complex containing APC, AXIN1, and GSK3A/B still phosphorylates β-catenin. HUWE1 loss enhanced GSK3A/B-dependent CTNNB1 phosphorylation. A CTNNB1 variant insensitive to destruction complex phosphorylation still showed reduced WNT signaling upon HUWE1 loss, revealing a GSK3A/B-dependent but β-catenin stability-independent mechanism.","method":"CSNK1A1 KO cells, HUWE1 KO, CTNNB1 phospho-resistant knockin, genetic interaction analysis, WNT reporter assay","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple independent genetic perturbations including knockin of phospho-resistant CTNNB1, epistasis with APC/AXIN1; rigorous dissection of mechanism","pmids":["40424469"],"is_preprint":false}],"current_model":"GSK3A is a constitutively active serine/threonine kinase that phosphorylates diverse substrates including β-catenin (within the APC/AXIN1/GSK3 destruction complex to promote WNT pathway suppression), splicing factors (RBM8A, SRSF9, PSF), RelA/NF-κB p65 (Thr-254, regulating chondrocyte differentiation), MTHFR (regulating one-carbon metabolism), viral proteins (SARS-CoV-2 nucleocapsid and adenovirus L4-22K), and sperm-specific substrates required for motility; it is inactivated by phosphorylation at Ser21 by PKA, PKB/AKT, and SGK1, acts upstream of mTORC1 to promote autophagy (its loss activates mTORC1 and suppresses autophagy), regulates long-term potentiation in hippocampal CA1 neurons, modulates nuclear chromatin architecture in a cohesin-dependent manner, and controls immune evasion in tumors via LRG1-mediated neutrophil NET formation—with several functions being isoform-specific and non-redundant with GSK3B."},"narrative":{"mechanistic_narrative":"GSK3A is a constitutively active serine/threonine protein kinase that phosphorylates a broad substrate repertoire to control cell proliferation, autophagy, metabolism, synaptic plasticity, and host-pathogen interactions, with many of its actions being isoform-specific and non-redundant with GSK3B [PMID:28916722, PMID:35782378, PMID:32581704]. Within the WNT pathway, GSK3A acts in a residual destruction complex with APC and AXIN1 to phosphorylate β-catenin and promote its turnover, an activity antagonized by HUWE1 and operating in part independently of β-catenin stability [PMID:40424469]; this WNT-suppressive function underlies its requirement for SHH-driven cerebellar granule neuron progenitor proliferation and medulloblastoma growth, which is rescued by β-catenin deletion [PMID:31540917]. GSK3A is positioned upstream of mTORC1 to permit autophagy, as its loss activates mTORC1 and suppresses autophagy markers in vivo [PMID:23549082]. Its kinase activity is restrained by inhibitory Ser21 phosphorylation imposed by PKA, PKB, and SGK1 [PMID:19911376, PMID:16543730]. GSK3A phosphorylates regulatory substrates including splicing factors RBM8A, SRSF9 and PSF [PMID:28916722], RelA/NF-κB p65 at Thr-254 to drive chondrocyte differentiation [PMID:22761446], and MTHFR to control one-carbon metabolism [PMID:30862944]; it also modulates cohesin-dependent long-range chromatin looping [PMID:37438531]. GSK3A is essential and isoform-specifically required for sperm flagellar function and male fertility, where its inhibitory phosphorylation correlates with progressive motility [PMID:25568307, PMID:30824926], and it uniquely limits long-term potentiation in CA1 hippocampal neurons [PMID:35782378]. In disease contexts, GSK3A is co-opted by viruses to phosphorylate the SARS-CoV-2 nucleocapsid protein and the adenovirus L4-22K protein to support replication [PMID:34593624, PMID:40537285], and it promotes tumor immune evasion through effects on T-cell function and LRG1-driven neutrophil NET formation [PMID:34142056, PMID:39174053].","teleology":[{"year":2006,"claim":"Established the upstream kinases that inactivate GSK3A, defining how its constitutive activity is held in check by survival/stress signaling.","evidence":"HEK293 overexpression of wild-type, constitutively active, and kinase-dead SGK1/PKB with pSer21 Western blots, plus in vivo DOCA/salt cardiac model","pmids":["16543730"],"confidence":"Medium","gaps":["Relative contribution of SGK1 vs PKB in physiological settings not resolved","Downstream consequences of Ser21 phosphorylation on specific substrates not mapped"]},{"year":2010,"claim":"Linked GSK3A Ser21 phosphorylation to a concrete physiological output — sperm motility — via cAMP/PKA and PKC, foreshadowing its reproductive role.","evidence":"Pharmacologic inhibition of PKA/PKC/PI3K with pSer21 Western blots and motility assays in boar spermatozoa","pmids":["19911376"],"confidence":"Medium","gaps":["Single-species (boar) correlative data","Direct sperm substrates of GSK3A not identified here"]},{"year":2010,"claim":"Identified GSK3A as a transcription-modulating kinase by demonstrating interaction with DEAF1 and control of 5-HT1A receptor promoter activity.","evidence":"Yeast two-hybrid, co-affinity purification, in vitro kinase assay, transcriptional reporter","pmids":["20368287"],"confidence":"Medium","gaps":["DEAF1 phosphosites not defined","In vivo relevance not established"]},{"year":2012,"claim":"Defined a developmental substrate (RelA Thr-254) through which GSK-3 drives chondrocyte differentiation, showing GSK3A/GSK3B redundancy in skeletal development.","evidence":"Compound Gsk3a/Gsk3b knockout mice, SOX9/COL2A1 transcriptional assays, phosphosite identification","pmids":["22761446"],"confidence":"High","gaps":["Does not isolate GSK3A-specific contribution from GSK3B","Mechanism by which Thr-254 phosphorylation alters RelA activity not detailed"]},{"year":2012,"claim":"First clear demonstration of isoform-specific signaling, with GSK3A but not GSK3B required for androgen receptor activity in prostate cancer.","evidence":"Isoform-specific siRNA knockdown with AR reporter, colony formation, and pAkt readouts in 22Rv1 cells","pmids":["22539113"],"confidence":"Medium","gaps":["Direct GSK3A substrate in AR pathway not identified","Single cell line"]},{"year":2013,"claim":"Placed GSK3A upstream of mTORC1 as a positive regulator of autophagy, answering how its loss produces tissue pathology.","evidence":"Global Gsk3a KO mice, pharmacologic inhibition, mTOR-inhibitor rescue, autophagy marker analysis","pmids":["23549082"],"confidence":"High","gaps":["Molecular intermediates between GSK3A and mTORC1 not defined","Whether effect is kinase-dependent substrate phosphorylation not shown"]},{"year":2014,"claim":"Connected GSK3A to chemoresistance and cell-death decisions by showing it supports DNA repair and a necroptotic switch in p53-null tumor cells.","evidence":"siRNA knockdown of GSK3A/GSK3B, DNA damage and caspase assays, AIF localization, PARP inhibition","pmids":["24984063"],"confidence":"Medium","gaps":["Redundant with GSK3B; GSK3A-specific role not isolated","DNA-repair substrate unknown"]},{"year":2014,"claim":"Revealed an immunometabolic role wherein GSK3A restrains anti-inflammatory IL-10 during ER stress, modulating atherosclerosis.","evidence":"Gsk3a/LDLR double-KO mice on high-fat diet, macrophage IL-10 assays, CT99021 inhibition","pmids":["25451156"],"confidence":"Medium","gaps":["Direct GSK3A substrate controlling IL-10 not identified","Macrophage-intrinsic vs systemic effects not fully separated"]},{"year":2015,"claim":"Established GSK3A as essential and non-redundant for sperm motility and male fertility, the strongest isoform-specific genetic phenotype.","evidence":"Targeted Gsk3a KO mice with flagellar waveform, ATP, PP1γ2 activity, and tyrosine phosphorylation readouts","pmids":["25568307"],"confidence":"High","gaps":["Sperm-specific GSK3A substrates not directly identified","Mechanism of PP1γ2 elevation unclear"]},{"year":2016,"claim":"Identified CREB as a direct transcriptional driver of GSK3A expression, linking GSK3A levels to lung cancer cell growth.","evidence":"CREB knockdown, ChIP on GSK3A promoter, GSK-3α loss-of-function viability/tumor assays","pmids":["27049759"],"confidence":"Medium","gaps":["Downstream GSK3A substrates in lung cancer not defined","Single context"]},{"year":2017,"claim":"Unbiased phosphoproteomics defined GSK3A's substrate landscape, including splicing factors and nucleolar proteins, linking it to alternative splicing.","evidence":"SILAC phosphoproteomics in Gsk3a/Gsk3b double-KO ES cells, in vitro kinase assays, RNA-Seq","pmids":["28916722"],"confidence":"High","gaps":["GSK3A vs GSK3B substrate preferences not separated","Functional consequences of individual phosphosites not validated"]},{"year":2017,"claim":"Implicated GSK3A in drug resistance via WNT reactivation, showing its loss in AML confers FLT3-inhibitor resistance.","evidence":"Genome-wide CRISPR screen, GSK3A KO validation in AML lines and primary samples, SPRY3 epistasis","pmids":["28625976"],"confidence":"Medium","gaps":["Direct GSK3A substrate controlling SPRY3/WNT not defined","Single-lab resistance model"]},{"year":2017,"claim":"Documented a physical GSK3A-MYC interaction in cancer cells, expanding its oncogenic interactome.","evidence":"NanoPCA protein-fragment complementation plus endogenous co-IP","pmids":["28087810"],"confidence":"Medium","gaps":["Functional consequence of interaction not tested","Whether MYC is a GSK3A substrate not shown"]},{"year":2019,"claim":"Defined GSK3A as an MTHFR kinase, connecting it to one-carbon metabolism through phosphorylation-enhanced allosteric inhibition.","evidence":"In vitro kinase assays and CRISPR phospho-null MTHFR knockins with 5-methyl-THF production assays","pmids":["30862944"],"confidence":"Medium","gaps":["GSK3A vs GSK3B contribution to MTHFR phosphorylation not separated","Physiological metabolic flux consequences in vivo not assessed"]},{"year":2019,"claim":"Showed GSK3A/B suppress retinoic acid synthesis via WNT/β-catenin repression of ALDH1A2 in fetal kidney development.","evidence":"CHIR99021 inhibition, β-catenin knockdown, ChIP and luciferase reporter assays","pmids":["32258025"],"confidence":"Medium","gaps":["GSK3A-specific role not isolated from GSK3B","Developmental in vivo relevance not directly tested"]},{"year":2019,"claim":"Demonstrated GSK3A's WNT-suppressive activity restrains SHH-driven neuronal proliferation, with effects rescued by β-catenin deletion.","evidence":"Conditional Gsk3a/Gsk3b double KO mice, Ctnnb1 rescue, transcriptomics, medulloblastoma model","pmids":["31540917"],"confidence":"High","gaps":["Single-isoform GSK3A contribution within the double KO not separated","Direct β-catenin phosphorylation in this context inferred not shown"]},{"year":2019,"claim":"Established human-relevant isoform specificity, with inhibited GSK3A (not GSK3B) correlating with progressive sperm motility, plus a sperm interactome.","evidence":"Correlation of GSK3 phosphorylation with motility in normo/asthenozoospermic samples, Y2H and co-IP","pmids":["30824926"],"confidence":"Medium","gaps":["Correlative, not causal in human sperm","Specific motility substrates not validated"]},{"year":2021,"claim":"Showed GSK3A is dispensable for MPTP-induced dopaminergic neurodegeneration, in contrast to GSK3B, sharpening isoform non-redundancy.","evidence":"Parallel dopaminergic-neuron-specific Gsk3a and Gsk3b conditional KO mice in MPTP model with neuron counts","pmids":["32581704"],"confidence":"High","gaps":["Negative result does not exclude GSK3A roles in other neurodegeneration models","Mechanism of GSK3B selectivity not addressed"]},{"year":2021,"claim":"Identified GSK3A as a host kinase phosphorylating the SARS-CoV-2 nucleocapsid protein required for viral replication.","evidence":"GSK3A/GSK3B double KO cells, in vitro kinase assay, GSK-3 inhibitor and viral replication assays","pmids":["34593624"],"confidence":"High","gaps":["GSK3A vs GSK3B individual contribution not separated","Functional effect of N phosphorylation on viral biology not fully defined"]},{"year":2021,"claim":"Assigned a non-redundant role for GSK3A in T cell-mediated tumor rejection, where it cooperates with GSK3B to control PD-1 and effector molecules.","evidence":"T cell-specific conditional Gsk3a/Gsk3b single and double KO mice, tumor growth, flow cytometry for PD-1/IFNγ/granzyme B","pmids":["34142056"],"confidence":"High","gaps":["Direct GSK3A substrate controlling PD-1 not identified","GSK3A-alone KO behaved like wild-type, leaving its specific node unclear"]},{"year":2021,"claim":"Implicated GSK3A in maintaining viral T-antigen transcription and growth of Merkel cell carcinoma.","evidence":"GSK3A CRISPR KO plus inducible GSK3B shRNA, TA expression analysis, xenograft model","pmids":["34715251"],"confidence":"Medium","gaps":["Mechanism linking GSK3A to TA transcription not defined","Reliance on combined GSK3B knockdown for full effect"]},{"year":2022,"claim":"Revealed a unique postsynaptic role for GSK3A in limiting CA1 hippocampal LTP, distinct from GSK3B.","evidence":"Conditional CaMK2a-Cre Gsk3a and Gsk3b KO mice, hippocampal slice electrophysiology","pmids":["35782378"],"confidence":"High","gaps":["Synaptic GSK3A substrates mediating LTP restraint not identified","Behavioral consequences not tested here"]},{"year":2022,"claim":"Placed GSK3A protein levels under translational control by MYCT1/RACK1 within the hepatic glycogen shunt.","evidence":"Global Myct1 KO mice, liver glycogen assays, RACK1-dependent translation analysis, Western blot","pmids":["35281731"],"confidence":"Medium","gaps":["Direct vs indirect translational control of GSK3A not fully resolved","GSK3A kinase function in glycogen metabolism not directly assayed"]},{"year":2022,"claim":"Mapped a SARS-CoV-2 N-protein variant (R203K/G204R) that enhances GSK3A binding and adjacent S206 phosphorylation, linking host kinase recruitment to viral mutation.","evidence":"Comparative biochemical analysis, co-IP with GSK3A, phosphosite mapping of mutant vs WT N protein","pmids":["35105893"],"confidence":"Medium","gaps":["Functional consequence for viral fitness not demonstrated","Single biochemical study"]},{"year":2023,"claim":"Identified GSK3A as a regulator of nuclear architecture, with its inhibition increasing cohesin-dependent long-range chromatin looping.","evidence":"HiDRO high-throughput Oligopaint imaging screen with GSK3A inhibition and cohesin-dependence validation","pmids":["37438531"],"confidence":"Medium","gaps":["Chromatin/cohesin substrate of GSK3A not identified","Whether effect is direct or via WNT not resolved"]},{"year":2024,"claim":"Defined a tumor immune-evasion mechanism in HCC whereby GSK3A drives neutrophil recruitment and NET formation via LRG1 to suppress CTLs.","evidence":"In vivo CRISPR screen, flow cytometry, neutrophil RNA-seq, Gsk3a KO HCC model","pmids":["39174053"],"confidence":"Medium","gaps":["Direct GSK3A substrate upstream of LRG1 not identified","Single tumor model"]},{"year":2024,"claim":"Validated GSK3A as a direct molecular target of quercetin, providing a pharmacological handle and stabilization mechanism.","evidence":"CETSA-MS, Western blot, molecular docking, site-directed mutagenesis, pull-down assays","pmids":["38342014"],"confidence":"Medium","gaps":["Effect of quercetin on GSK3A kinase activity not established","Cellular phenotype of stabilization not defined"]},{"year":2024,"claim":"Identified CCDC28A as a sperm interactor of GSK3A with phenotypically overlapping knockouts, nominating a fertility-relevant complex.","evidence":"Co-immunoprecipitation and Ccdc28a KO mouse sperm morphology/motility analysis","pmids":["38597936"],"confidence":"Low","gaps":["Single co-IP without reciprocal/structural validation","Phenotypic overlap is indirect evidence for functional connection","Whether CCDC28A is a GSK3A substrate unknown"]},{"year":2025,"claim":"Dissected GSK3A's role in the β-catenin destruction complex, showing it phosphorylates β-catenin with APC/AXIN1 and is antagonized by HUWE1, including a β-catenin-stability-independent output.","evidence":"CSNK1A1 KO cells, HUWE1 KO, phospho-resistant CTNNB1 knockin, genetic interaction and WNT reporter assays","pmids":["40424469"],"confidence":"High","gaps":["GSK3A vs GSK3B contributions within the complex not separated","Nature of the stability-independent WNT mechanism not defined"]},{"year":2025,"claim":"Demonstrated GSK3A kinase activity supports adenovirus replication through direct phosphorylation of L4-22K, mapping the kinase-domain interaction.","evidence":"cDNA gain-of-function screen, kinase-dead mutants, phosphoproteomics, co-IP, domain mapping","pmids":["40537285"],"confidence":"High","gaps":["In vivo relevance of L4-22K phosphorylation not tested","Whether this generalizes to other adenovirus serotypes unknown"]},{"year":null,"claim":"It remains unresolved which direct GSK3A substrates underlie its isoform-specific phenotypes (sperm motility, LTP limitation, T-cell immunity, chromatin looping), and how GSK3A activity and substrate selection are differentially controlled from GSK3B.","evidence":"","pmids":[],"confidence":"Low","gaps":["No GSK3A-unique substrate has been assigned to its non-redundant neuronal or immune phenotypes","Structural/regulatory basis for GSK3A vs GSK3B substrate discrimination not defined","Whether chromatin and metabolic roles are direct kinase actions remains open"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,2,18,22,30,3]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[4,22,30]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[19]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[30,12,9]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[14,21,16]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[4]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[18,27]}],"complexes":["β-catenin destruction complex (APC/AXIN1/GSK3)"],"partners":["CTNNB1","AXIN1","APC","HUWE1","DEAF1","MYC","CCDC28A","RELA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P49840","full_name":"Glycogen synthase kinase-3 alpha","aliases":["Serine/threonine-protein kinase GSK3A"],"length_aa":483,"mass_kda":51.0,"function":"Constitutively active protein kinase that acts as a negative regulator in the hormonal control of glucose homeostasis, Wnt signaling and regulation of transcription factors and microtubules, by phosphorylating and inactivating glycogen synthase (GYS1 or GYS2), CTNNB1/beta-catenin, APC and AXIN1 (PubMed:11749387, PubMed:17478001, PubMed:19366350). Requires primed phosphorylation of the majority of its substrates (PubMed:11749387, PubMed:17478001, PubMed:19366350). Contributes to insulin regulation of glycogen synthesis by phosphorylating and inhibiting GYS1 activity and hence glycogen synthesis (PubMed:11749387, PubMed:17478001, PubMed:19366350). Regulates glycogen metabolism in liver, but not in muscle (By similarity). May also mediate the development of insulin resistance by regulating activation of transcription factors (PubMed:10868943, PubMed:17478001). In Wnt signaling, regulates the level and transcriptional activity of nuclear CTNNB1/beta-catenin (PubMed:17229088). Facilitates amyloid precursor protein (APP) processing and the generation of APP-derived amyloid plaques found in Alzheimer disease (PubMed:12761548). May be involved in the regulation of replication in pancreatic beta-cells (By similarity). Is necessary for the establishment of neuronal polarity and axon outgrowth (By similarity). Through phosphorylation of the anti-apoptotic protein MCL1, may control cell apoptosis in response to growth factors deprivation (By similarity). Acts as a regulator of autophagy by mediating phosphorylation of KAT5/TIP60 under starvation conditions which activates KAT5/TIP60 acetyltransferase activity and promotes acetylation of key autophagy regulators, such as ULK1 and RUBCNL/Pacer (PubMed:30704899). Negatively regulates extrinsic apoptotic signaling pathway via death domain receptors. Promotes the formation of an anti-apoptotic complex, made of DDX3X, BRIC2 and GSK3B, at death receptors, including TNFRSF10B. The anti-apoptotic function is most effective with weak apoptotic signals and can be overcome by stronger stimulation (By similarity). Phosphorylates mTORC2 complex component RICTOR at 'Thr-1695' which facilitates FBXW7-mediated ubiquitination and subsequent degradation of RICTOR (PubMed:25897075)","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P49840/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GSK3A","classification":"Not 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PHLPPL","url":"https://www.omim.org/entry/611066"},{"mim_id":"610933","title":"LEUCINE-RICH REPEAT- AND STERILE ALPHA MOTIF-CONTAINING 1; LRSAM1","url":"https://www.omim.org/entry/610933"},{"mim_id":"610911","title":"RHO GTPase-ACTIVATING PROTEIN 31; ARHGAP31","url":"https://www.omim.org/entry/610911"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GSK3A"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P49840","domains":[{"cath_id":"3.30.200.20","chopping":"104-195","consensus_level":"high","plddt":94.1902,"start":104,"end":195},{"cath_id":"1.10.510.10","chopping":"200-444","consensus_level":"high","plddt":96.5547,"start":200,"end":444}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P49840","model_url":"https://alphafold.ebi.ac.uk/files/AF-P49840-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P49840-F1-predicted_aligned_error_v6.png","plddt_mean":78.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GSK3A","jax_strain_url":"https://www.jax.org/strain/search?query=GSK3A"},"sequence":{"accession":"P49840","fasta_url":"https://rest.uniprot.org/uniprotkb/P49840.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P49840/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P49840"}},"corpus_meta":[{"pmid":"9515795","id":"PMC_9515795","title":"Mutational 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\"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"GSK-3α is a critical regulator of mTORC1 and autophagy; global Gsk3a knockout mice show marked activation of mTORC1 and suppression of autophagy markers, and pharmacologic inhibition or gene deletion of Gsk3a suppresses autophagy in fibroblasts. mTOR inhibition rescued both the autophagy defect and established muscle pathologies in KO mice, placing GSK-3α upstream of mTORC1 in this pathway.\",\n      \"method\": \"Global Gsk3a knockout mouse, pharmacologic inhibition, mTOR inhibitor rescue, autophagy marker analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and pharmacologic rescue experiments, multiple orthogonal readouts in vivo and in vitro, replicated by both KO and inhibitor approaches\",\n      \"pmids\": [\"23549082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GSK3A is essential for sperm motility and male fertility in mice; targeted Gsk3a knockout causes impaired flagellar waveform, reduced sperm ATP levels, elevated PP1γ2 catalytic activity, and absence of capacitation-associated tyrosine phosphorylation. GSK3B cannot substitute for GSK3A in this context, demonstrating isoform-specific function.\",\n      \"method\": \"Targeted gene knockout mouse, sperm motility parameters, ATP assay, PP1γ2 activity assay, tyrosine phosphorylation analysis\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with multiple defined cellular phenotypes, isoform specificity confirmed by persistence of GSK3B without rescue\",\n      \"pmids\": [\"25568307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GSK-3α and GSK-3β function redundantly in early chondrocyte differentiation via phosphorylation of RelA (NF-κB p65) at Thr-254; compound knockout (Gsk3a−/−;Gsk3b+/−) causes dwarfism and impaired chondrocyte differentiation, and computational/transcriptional assays identified Thr-254 as the critical GSK-3 phosphorylation site on RelA for this process.\",\n      \"method\": \"Compound mouse knockout, SOX9 and COL2A1 transcriptional assays, computational prediction, phosphorylation site identification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with two isoforms, specific phosphorylation site identified, multiple transcriptional readouts in one study\",\n      \"pmids\": [\"22761446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GSK3A phosphorylates the SARS-CoV-2 nucleocapsid (N) protein; GSK3A and GSK3B double knockout abolishes N protein phosphorylation, and GSK-3 inhibitors block N phosphorylation and impair SARS-CoV-2 replication in lung epithelial cells.\",\n      \"method\": \"GSK3A/GSK3B knockout cells, in vitro kinase assay, GSK-3 inhibitor treatment, viral replication assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus pharmacologic inhibition plus direct phosphorylation assay, peer-reviewed\",\n      \"pmids\": [\"34593624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GSK-3 (including GSK3A) phosphorylates multiple splicing factors including RBM8A, SRSF9, and PSF, as well as nucleolar proteins NPM1 and PHF6; comparison of WT and Gsk3a;Gsk3b double-KO ES cells by SILAC phosphoproteomics revealed prominent GSK-3-dependent phosphorylation of these substrates, and recombinant GSK-3β phosphorylated them in vitro. GSK-3 DKO altered alternative splicing of ~190 genes.\",\n      \"method\": \"SILAC phosphoproteomics, Gsk3a;Gsk3b double-KO mouse ES cells, in vitro kinase assay, RNA-Seq\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase reconstitution plus unbiased phosphoproteomics in KO cells, multiple orthogonal methods in one study\",\n      \"pmids\": [\"28916722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PKA, PKC, and PI3K pathways regulate GSK3A Ser21 phosphorylation (inactivation) in boar spermatozoa to control motility; cAMP/8Br-cAMP increases Ser21 phosphorylation coincident with increased motility, effects blocked by PKA inhibitor H89 or PKC inhibitor Ro-32-0432. PI3K inhibition increases basal GSK3A phosphorylation via an intracellular cAMP/PKA-dependent mechanism.\",\n      \"method\": \"Pharmacologic inhibition of PKA (H89), PKC (Ro-32-0432), PI3K (LY294002), Western blot for pSer21-GSK3A, sperm motility assay\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pathway inhibitors with orthogonal readouts in a single study, single lab\",\n      \"pmids\": [\"19911376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SGK1 and PKB phosphorylate GSK3A at Ser21 in HEK293 cells; overexpression of wild-type and constitutively active SGK1, but not catalytically inactive SGK1, increased GSK3α/β phosphorylation. DOCA/high-salt treatment of mice induced cardiac GSK3α phosphorylation (less robustly than GSK3β).\",\n      \"method\": \"HEK293 overexpression with wild-type, constitutively active, and kinase-inactive SGK1; Western blot for pSer21; in vivo DOCA/salt mouse model\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — catalytically inactive mutant controls establish kinase requirement; in vivo corroboration; single lab\",\n      \"pmids\": [\"16543730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GSK3A and GSK3B are identified as in vitro substrates of themselves and as interactors with DEAF1 transcription factor via yeast two-hybrid and co-affinity purification; GSK3 inhibitors increase DEAF1 transcriptional activity on the 5-HT1A serotonin receptor promoter.\",\n      \"method\": \"Yeast two-hybrid screen, co-affinity purification, in vitro kinase assay, transcriptional reporter assay\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal biochemical validation (Y2H + co-AP + in vitro assay + reporter), single lab\",\n      \"pmids\": [\"20368287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GSK-3α silencing (but not GSK-3β silencing) reduces androgen receptor (AR) transcriptional activity in 22Rv1 prostate cancer cells; silencing of either isoform reduces colony formation. GSK-3β silencing but not GSK-3α silencing reduced Akt phosphorylation, demonstrating distinct isoform-specific signaling roles.\",\n      \"method\": \"siRNA gene silencing, AR transcriptional activity assay, colony formation assay, Western blot for pAkt\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific siRNA knockdown with multiple functional readouts; single lab\",\n      \"pmids\": [\"22539113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Loss of GSK3A expression (via CRISPR KO) in AML cells confers resistance to FLT3 inhibitor AC220 by reactivating Wnt signaling, and SPRY3 expression is positioned downstream of GSK3A in this resistance pathway.\",\n      \"method\": \"Genome-wide CRISPR screen, GSK3A KO validation in AML cell lines and primary patient samples, Wnt signaling pathway analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with defined signaling readouts and epistasis (SPRY3 downstream of GSK3A); validated in primary samples; single lab\",\n      \"pmids\": [\"28625976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GSK-3 (including GSK3A) activity is negatively correlated with human sperm motility in an isoform-specific manner: inhibited (Ser-phosphorylated) GSK3A correlates strongly with progressive motility (r=0.822, p=0.023), whereas inhibited GSK3B does not. GSK3A interactors in sperm were identified by yeast two-hybrid and co-immunoprecipitation.\",\n      \"method\": \"Correlative analysis of GSK3 phosphorylation vs. motility in normospermic and asthenozoospermic samples, yeast two-hybrid, co-immunoprecipitation\",\n      \"journal\": \"Molecular human reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — correlative biochemical data plus co-IP interactome; isoform specificity established in human samples; single lab\",\n      \"pmids\": [\"30824926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GSK3A/B inhibit ALDH1A2 (retinoic acid synthetic enzyme) expression via Wnt/β-catenin signaling in fetal kidney cells; CHIR99021 represses ALDH1A2, this effect is abolished when β-catenin is inhibited, and ChIP shows β-catenin recruitment to the ALDH1A2 promoter.\",\n      \"method\": \"GSK3A/B inhibitor (CHIR99021), β-catenin knockdown, ChIP, luciferase reporter assay\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacologic epistasis with ChIP confirmation; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"32258025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GSK3A and GSK3B are required for cerebellar granule neuron progenitor (CGNP) proliferation driven by SHH signaling; co-deletion of Gsk3a and Gsk3b blocks proliferation and causes severe cerebellar hypoplasia. Ctnnb1 co-deletion rescues hypoproliferation in Gsk3a/b mutants, demonstrating the GSK-3 effect is mediated through WNT/β-catenin. Co-deletion also blocks SHH-driven medulloblastoma growth.\",\n      \"method\": \"Conditional double Gsk3a/Gsk3b KO mice, Ctnnb1 genetic rescue, transcriptomic analysis, SmoM2 medulloblastoma model\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional double KO with genetic epistasis rescue by Ctnnb1 deletion, multiple phenotypic readouts in vivo\",\n      \"pmids\": [\"31540917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GSK3A-specific (Gsk3aΔ) neuronal knockout mice do not show resistance to MPTP-induced dopaminergic neurodegeneration, whereas Gsk3bΔ mice do; this establishes non-redundancy between isoforms in Parkinsonian neurodegeneration, with GSK3α dispensable for this process.\",\n      \"method\": \"Dopaminergic neuron-specific conditional Gsk3a KO and Gsk3b KO mice, MPTP model, dopaminergic neuron counting\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — parallel isoform-specific conditional KO models with direct neuronal count readout; establishes negative result for GSK3α\",\n      \"pmids\": [\"32581704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GSK-3α contributes to T cell-mediated tumor rejection in a non-redundant manner with GSK-3β; Gsk3b−/− mice suppress tumor growth equivalently to Gsk3a/b double KO, whereas Gsk3a−/− behaves like wild-type. Both isoforms differentially regulate PD-1, IFNγ, and granzyme B expression and synergize to control PD-1 levels and CD4/CD8 T cell tumor infiltration.\",\n      \"method\": \"Conditional T cell-specific Gsk3a and Gsk3b KO mice, tumor growth assays, flow cytometry for PD-1/IFNγ/granzyme B\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — parallel conditional single and double KO with multiple immune readouts; clear isoform dissection\",\n      \"pmids\": [\"34142056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GSK3A silencing abolishes growth of p53-null colon carcinoma cells after DNA-damaging chemotherapy by impairing DNA repair, enabling a necroptotic response (RIP1-independent, PARP-dependent AIF nuclear re-localization without caspase activation); GSK3A is redundant with GSK3B in this drug resistance mechanism.\",\n      \"method\": \"siRNA silencing of GSK3A/GSK3B, DNA damage assays, caspase activity, AIF localization, PARP inhibition\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — parallel isoform knockdowns with defined cell death mechanism; single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"24984063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GSK3α deficiency in macrophages increases IL-10 production in response to endoplasmic reticulum stress; Gsk3a KO in LDLR-deficient mice attenuates atherosclerosis and hepatic steatosis, associated with elevated plasma IL-10 and enhanced ER stress-induced IL-10 in macrophages treated with GSK3α/β inhibitor CT99021.\",\n      \"method\": \"Gsk3a KO crossed with LDLR KO mice, high-fat diet model, macrophage IL-10 assay, CT99021 pharmacologic inhibition\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO with pharmacologic corroboration, defined IL-10 mechanism; single lab\",\n      \"pmids\": [\"25451156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GSK-3α is a direct transcriptional target of CREB in lung cancer cells; CREB knockdown reduces GSK3A expression, and CREB binds directly to the GSK3A promoter as shown by ChIP. GSK-3α inhibition suppresses cell viability, colony formation, and tumor growth in lung cancer.\",\n      \"method\": \"CREB siRNA knockdown, ChIP of CREB on GSK3A promoter, GSK-3α inhibition with loss-of-function assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishes direct promoter binding; loss-of-function phenotype confirmed; single lab\",\n      \"pmids\": [\"27049759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GSK3A and GSK3B phosphorylate MTHFR (methylenetetrahydrofolate reductase) at multiple N-terminal sites in vitro and in cells; CRISPR knockin of phospho-null MTHFR mutants showed that phosphorylation enhances SAM-dependent allosteric inhibition and controls one-carbon metabolism.\",\n      \"method\": \"In vitro kinase assay with GSK3A/B, CRISPR knockin phospho-null mutants, 5-methyl-THF production assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus CRISPR knockin functional confirmation; single lab\",\n      \"pmids\": [\"30862944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Genetic or chemical inhibition of GSK3A leads to increased long-range chromatin looping interactions in a genome-wide and cohesin-dependent manner, implicating GSK3A in the regulation of nuclear architecture.\",\n      \"method\": \"HiDRO high-throughput Oligopaint imaging screen, GSK3A genetic inhibition, cohesin-dependence validation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — validated hit from functional screen with cohesin epistasis; single lab study\",\n      \"pmids\": [\"37438531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GSK3A-specific neuronal deletion (Camk2a-Cre driven Gsk3a KO) in adult mice enhances long-term potentiation (LTP) in CA1 hippocampal neurons without affecting basal synaptic function; deletion of Gsk3b does not produce this effect, demonstrating a unique postsynaptic role of GSK3α in limiting LTP.\",\n      \"method\": \"Conditional CaMK2a-Cre Gsk3a KO and Gsk3b KO mice, hippocampal slice electrophysiology, LTP measurement\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — parallel conditional isoform-specific KO with direct electrophysiological readout; isoform specificity clearly established\",\n      \"pmids\": [\"35782378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Gsk3a promotes immune evasion in hepatocellular carcinoma by inducing neutrophil chemotaxis and neutrophil extracellular trap (NET) formation through the intermediate molecule LRG1, which suppresses cytotoxic T lymphocyte (CTL) function; identified by CRISPR screening in immunocompetent vs. immune-deficient mice.\",\n      \"method\": \"CRISPR in vivo screen, flow cytometry for immune infiltration, RNA sequencing of neutrophils, Gsk3a KO in HCC model\",\n      \"journal\": \"Journal for immunotherapy of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with defined immune mechanism and LRG1 pathway; single lab\",\n      \"pmids\": [\"39174053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GSK3A promotes human adenovirus B7 (HAdV-B7) replication through its kinase activity; kinase-active S21A mutant enhances, while kinase-inactive Y279A and K148A mutants fail to support, viral replication. GSK3A phosphorylates the viral L4-22K protein at S78 and S81 via direct interaction between GSK3A's kinase domain and residues 92-168 of L4-22K.\",\n      \"method\": \"cDNA gain-of-function screen, GSK3A overexpression/KO/KD, kinase-dead mutants, phosphoproteomics, co-immunoprecipitation, structural modeling and truncation assays\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro/cellular kinase assay with active-site mutagenesis, co-IP, phosphoproteomics, and domain mapping in one rigorous study\",\n      \"pmids\": [\"40537285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SARS-CoV-2 nucleocapsid R203K/G204R mutant protein shows increased interaction with GSK3A kinase simultaneously with hyper-phosphorylation of adjacent serine site S206, as revealed by comparative biochemical analysis of mutant versus wild-type N protein.\",\n      \"method\": \"Comparative biochemical analysis, co-immunoprecipitation with GSK3A, phosphorylation site mapping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical interaction and phosphorylation assay; single study\",\n      \"pmids\": [\"35105893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GSK3A was validated as a direct binding target of quercetin by CETSA-MS, Western blot, molecular docking, site-directed mutagenesis, and pull-down assays, showing that quercetin stabilizes GSK3A protein in cells.\",\n      \"method\": \"CETSA-MS proteomics, Western blot, molecular docking, site-directed mutagenesis, pull-down assay\",\n      \"journal\": \"European journal of medicinal chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal target validation methods including mutagenesis; single lab\",\n      \"pmids\": [\"38342014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GSK3A was confirmed as a MYC-interacting protein in live cancer cells using NanoLuc-based protein-fragment complementation assay (NanoPCA), with interaction validated by co-immunoprecipitation of endogenous proteins.\",\n      \"method\": \"NanoPCA protein-fragment complementation assay, co-immunoprecipitation of endogenous proteins\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — reciprocal co-IP confirms interaction; single lab\",\n      \"pmids\": [\"28087810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GSK3A KO combined with inducible GSK3B shRNA knockdown in Merkel cell carcinoma (MCC) cells suppresses T-antigen (TA) transcription and MCC cell growth; individual GSK3A KO alone confirmed involvement of GSK3A in TA expression regulation.\",\n      \"method\": \"GSK3A CRISPR KO, inducible GSK3B shRNA, TA expression analysis, MCC xenograft model\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with functional phenotype and in vivo validation; single lab\",\n      \"pmids\": [\"34715251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MYCT1 promotes translation of GSK3A (along with PGM1 and UGP2) in hepatic cells via a RACK1-dependent mechanism; global Myct1 inactivation in mice leads to progressive hepatic glycogen accumulation and reduced GSK3A protein, establishing GSK3A as a translationally regulated component of the glycogen shunt.\",\n      \"method\": \"Global Myct1 KO mice, liver glycogen assay, RACK1-dependent translation analysis, Western blot\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO with mechanistic pathway placement; single lab\",\n      \"pmids\": [\"35281731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GSK3A activity is abnormally elevated during sperm cryopreservation and is identified as the key kinase regulating sperm motility-associated phosphorylation; a GSK3A-centric phosphorylation network was constructed from quantitative phosphoproteomics of fresh vs. cryopreserved sperm.\",\n      \"method\": \"Quantitative phosphoproteomics, kinase enrichment analysis, Western blot for GSK3A activation state\",\n      \"journal\": \"Bioscience reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — phosphoproteomics-based inference with kinase enrichment; direct mechanistic validation of specific substrates limited\",\n      \"pmids\": [\"34596222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CCDC28A interacts with GSK3A in sperm (co-immunoprecipitation), and Ccdc28a KO mice show sperm phenotypes overlapping with those of Gsk3a-deficient mice (bent sperm heads, acrosomal defects, reduced motility).\",\n      \"method\": \"Co-immunoprecipitation, Ccdc28a KO mouse, sperm morphology and motility analysis\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP demonstrates interaction; phenotypic overlap is indirect evidence for functional connection\",\n      \"pmids\": [\"38597936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GSK3A (together with GSK3B) functions within the β-catenin destruction complex to phosphorylate β-catenin, promoting its degradation; HUWE1 antagonizes this activity to enhance WNT signaling. In cells lacking CSNK1A1, a residual destruction complex containing APC, AXIN1, and GSK3A/B still phosphorylates β-catenin. HUWE1 loss enhanced GSK3A/B-dependent CTNNB1 phosphorylation. A CTNNB1 variant insensitive to destruction complex phosphorylation still showed reduced WNT signaling upon HUWE1 loss, revealing a GSK3A/B-dependent but β-catenin stability-independent mechanism.\",\n      \"method\": \"CSNK1A1 KO cells, HUWE1 KO, CTNNB1 phospho-resistant knockin, genetic interaction analysis, WNT reporter assay\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple independent genetic perturbations including knockin of phospho-resistant CTNNB1, epistasis with APC/AXIN1; rigorous dissection of mechanism\",\n      \"pmids\": [\"40424469\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GSK3A is a constitutively active serine/threonine kinase that phosphorylates diverse substrates including β-catenin (within the APC/AXIN1/GSK3 destruction complex to promote WNT pathway suppression), splicing factors (RBM8A, SRSF9, PSF), RelA/NF-κB p65 (Thr-254, regulating chondrocyte differentiation), MTHFR (regulating one-carbon metabolism), viral proteins (SARS-CoV-2 nucleocapsid and adenovirus L4-22K), and sperm-specific substrates required for motility; it is inactivated by phosphorylation at Ser21 by PKA, PKB/AKT, and SGK1, acts upstream of mTORC1 to promote autophagy (its loss activates mTORC1 and suppresses autophagy), regulates long-term potentiation in hippocampal CA1 neurons, modulates nuclear chromatin architecture in a cohesin-dependent manner, and controls immune evasion in tumors via LRG1-mediated neutrophil NET formation—with several functions being isoform-specific and non-redundant with GSK3B.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GSK3A is a constitutively active serine/threonine protein kinase that phosphorylates a broad substrate repertoire to control cell proliferation, autophagy, metabolism, synaptic plasticity, and host-pathogen interactions, with many of its actions being isoform-specific and non-redundant with GSK3B [#4, #20, #13]. Within the WNT pathway, GSK3A acts in a residual destruction complex with APC and AXIN1 to phosphorylate \\u03b2-catenin and promote its turnover, an activity antagonized by HUWE1 and operating in part independently of \\u03b2-catenin stability [#30]; this WNT-suppressive function underlies its requirement for SHH-driven cerebellar granule neuron progenitor proliferation and medulloblastoma growth, which is rescued by \\u03b2-catenin deletion [#12]. GSK3A is positioned upstream of mTORC1 to permit autophagy, as its loss activates mTORC1 and suppresses autophagy markers in vivo [#0]. Its kinase activity is restrained by inhibitory Ser21 phosphorylation imposed by PKA, PKB, and SGK1 [#5, #6]. GSK3A phosphorylates regulatory substrates including splicing factors RBM8A, SRSF9 and PSF [#4], RelA/NF-\\u03baB p65 at Thr-254 to drive chondrocyte differentiation [#2], and MTHFR to control one-carbon metabolism [#18]; it also modulates cohesin-dependent long-range chromatin looping [#19]. GSK3A is essential and isoform-specifically required for sperm flagellar function and male fertility, where its inhibitory phosphorylation correlates with progressive motility [#1, #10], and it uniquely limits long-term potentiation in CA1 hippocampal neurons [#20]. In disease contexts, GSK3A is co-opted by viruses to phosphorylate the SARS-CoV-2 nucleocapsid protein and the adenovirus L4-22K protein to support replication [#3, #22], and it promotes tumor immune evasion through effects on T-cell function and LRG1-driven neutrophil NET formation [#14, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established the upstream kinases that inactivate GSK3A, defining how its constitutive activity is held in check by survival/stress signaling.\",\n      \"evidence\": \"HEK293 overexpression of wild-type, constitutively active, and kinase-dead SGK1/PKB with pSer21 Western blots, plus in vivo DOCA/salt cardiac model\",\n      \"pmids\": [\"16543730\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of SGK1 vs PKB in physiological settings not resolved\", \"Downstream consequences of Ser21 phosphorylation on specific substrates not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked GSK3A Ser21 phosphorylation to a concrete physiological output \\u2014 sperm motility \\u2014 via cAMP/PKA and PKC, foreshadowing its reproductive role.\",\n      \"evidence\": \"Pharmacologic inhibition of PKA/PKC/PI3K with pSer21 Western blots and motility assays in boar spermatozoa\",\n      \"pmids\": [\"19911376\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-species (boar) correlative data\", \"Direct sperm substrates of GSK3A not identified here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified GSK3A as a transcription-modulating kinase by demonstrating interaction with DEAF1 and control of 5-HT1A receptor promoter activity.\",\n      \"evidence\": \"Yeast two-hybrid, co-affinity purification, in vitro kinase assay, transcriptional reporter\",\n      \"pmids\": [\"20368287\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DEAF1 phosphosites not defined\", \"In vivo relevance not established\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined a developmental substrate (RelA Thr-254) through which GSK-3 drives chondrocyte differentiation, showing GSK3A/GSK3B redundancy in skeletal development.\",\n      \"evidence\": \"Compound Gsk3a/Gsk3b knockout mice, SOX9/COL2A1 transcriptional assays, phosphosite identification\",\n      \"pmids\": [\"22761446\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not isolate GSK3A-specific contribution from GSK3B\", \"Mechanism by which Thr-254 phosphorylation alters RelA activity not detailed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"First clear demonstration of isoform-specific signaling, with GSK3A but not GSK3B required for androgen receptor activity in prostate cancer.\",\n      \"evidence\": \"Isoform-specific siRNA knockdown with AR reporter, colony formation, and pAkt readouts in 22Rv1 cells\",\n      \"pmids\": [\"22539113\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GSK3A substrate in AR pathway not identified\", \"Single cell line\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed GSK3A upstream of mTORC1 as a positive regulator of autophagy, answering how its loss produces tissue pathology.\",\n      \"evidence\": \"Global Gsk3a KO mice, pharmacologic inhibition, mTOR-inhibitor rescue, autophagy marker analysis\",\n      \"pmids\": [\"23549082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular intermediates between GSK3A and mTORC1 not defined\", \"Whether effect is kinase-dependent substrate phosphorylation not shown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected GSK3A to chemoresistance and cell-death decisions by showing it supports DNA repair and a necroptotic switch in p53-null tumor cells.\",\n      \"evidence\": \"siRNA knockdown of GSK3A/GSK3B, DNA damage and caspase assays, AIF localization, PARP inhibition\",\n      \"pmids\": [\"24984063\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Redundant with GSK3B; GSK3A-specific role not isolated\", \"DNA-repair substrate unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed an immunometabolic role wherein GSK3A restrains anti-inflammatory IL-10 during ER stress, modulating atherosclerosis.\",\n      \"evidence\": \"Gsk3a/LDLR double-KO mice on high-fat diet, macrophage IL-10 assays, CT99021 inhibition\",\n      \"pmids\": [\"25451156\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GSK3A substrate controlling IL-10 not identified\", \"Macrophage-intrinsic vs systemic effects not fully separated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established GSK3A as essential and non-redundant for sperm motility and male fertility, the strongest isoform-specific genetic phenotype.\",\n      \"evidence\": \"Targeted Gsk3a KO mice with flagellar waveform, ATP, PP1\\u03b32 activity, and tyrosine phosphorylation readouts\",\n      \"pmids\": [\"25568307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sperm-specific GSK3A substrates not directly identified\", \"Mechanism of PP1\\u03b32 elevation unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified CREB as a direct transcriptional driver of GSK3A expression, linking GSK3A levels to lung cancer cell growth.\",\n      \"evidence\": \"CREB knockdown, ChIP on GSK3A promoter, GSK-3\\u03b1 loss-of-function viability/tumor assays\",\n      \"pmids\": [\"27049759\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream GSK3A substrates in lung cancer not defined\", \"Single context\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Unbiased phosphoproteomics defined GSK3A's substrate landscape, including splicing factors and nucleolar proteins, linking it to alternative splicing.\",\n      \"evidence\": \"SILAC phosphoproteomics in Gsk3a/Gsk3b double-KO ES cells, in vitro kinase assays, RNA-Seq\",\n      \"pmids\": [\"28916722\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GSK3A vs GSK3B substrate preferences not separated\", \"Functional consequences of individual phosphosites not validated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Implicated GSK3A in drug resistance via WNT reactivation, showing its loss in AML confers FLT3-inhibitor resistance.\",\n      \"evidence\": \"Genome-wide CRISPR screen, GSK3A KO validation in AML lines and primary samples, SPRY3 epistasis\",\n      \"pmids\": [\"28625976\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GSK3A substrate controlling SPRY3/WNT not defined\", \"Single-lab resistance model\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Documented a physical GSK3A-MYC interaction in cancer cells, expanding its oncogenic interactome.\",\n      \"evidence\": \"NanoPCA protein-fragment complementation plus endogenous co-IP\",\n      \"pmids\": [\"28087810\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of interaction not tested\", \"Whether MYC is a GSK3A substrate not shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined GSK3A as an MTHFR kinase, connecting it to one-carbon metabolism through phosphorylation-enhanced allosteric inhibition.\",\n      \"evidence\": \"In vitro kinase assays and CRISPR phospho-null MTHFR knockins with 5-methyl-THF production assays\",\n      \"pmids\": [\"30862944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GSK3A vs GSK3B contribution to MTHFR phosphorylation not separated\", \"Physiological metabolic flux consequences in vivo not assessed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed GSK3A/B suppress retinoic acid synthesis via WNT/\\u03b2-catenin repression of ALDH1A2 in fetal kidney development.\",\n      \"evidence\": \"CHIR99021 inhibition, \\u03b2-catenin knockdown, ChIP and luciferase reporter assays\",\n      \"pmids\": [\"32258025\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GSK3A-specific role not isolated from GSK3B\", \"Developmental in vivo relevance not directly tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated GSK3A's WNT-suppressive activity restrains SHH-driven neuronal proliferation, with effects rescued by \\u03b2-catenin deletion.\",\n      \"evidence\": \"Conditional Gsk3a/Gsk3b double KO mice, Ctnnb1 rescue, transcriptomics, medulloblastoma model\",\n      \"pmids\": [\"31540917\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-isoform GSK3A contribution within the double KO not separated\", \"Direct \\u03b2-catenin phosphorylation in this context inferred not shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established human-relevant isoform specificity, with inhibited GSK3A (not GSK3B) correlating with progressive sperm motility, plus a sperm interactome.\",\n      \"evidence\": \"Correlation of GSK3 phosphorylation with motility in normo/asthenozoospermic samples, Y2H and co-IP\",\n      \"pmids\": [\"30824926\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative, not causal in human sperm\", \"Specific motility substrates not validated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed GSK3A is dispensable for MPTP-induced dopaminergic neurodegeneration, in contrast to GSK3B, sharpening isoform non-redundancy.\",\n      \"evidence\": \"Parallel dopaminergic-neuron-specific Gsk3a and Gsk3b conditional KO mice in MPTP model with neuron counts\",\n      \"pmids\": [\"32581704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Negative result does not exclude GSK3A roles in other neurodegeneration models\", \"Mechanism of GSK3B selectivity not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified GSK3A as a host kinase phosphorylating the SARS-CoV-2 nucleocapsid protein required for viral replication.\",\n      \"evidence\": \"GSK3A/GSK3B double KO cells, in vitro kinase assay, GSK-3 inhibitor and viral replication assays\",\n      \"pmids\": [\"34593624\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GSK3A vs GSK3B individual contribution not separated\", \"Functional effect of N phosphorylation on viral biology not fully defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Assigned a non-redundant role for GSK3A in T cell-mediated tumor rejection, where it cooperates with GSK3B to control PD-1 and effector molecules.\",\n      \"evidence\": \"T cell-specific conditional Gsk3a/Gsk3b single and double KO mice, tumor growth, flow cytometry for PD-1/IFN\\u03b3/granzyme B\",\n      \"pmids\": [\"34142056\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct GSK3A substrate controlling PD-1 not identified\", \"GSK3A-alone KO behaved like wild-type, leaving its specific node unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Implicated GSK3A in maintaining viral T-antigen transcription and growth of Merkel cell carcinoma.\",\n      \"evidence\": \"GSK3A CRISPR KO plus inducible GSK3B shRNA, TA expression analysis, xenograft model\",\n      \"pmids\": [\"34715251\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking GSK3A to TA transcription not defined\", \"Reliance on combined GSK3B knockdown for full effect\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed a unique postsynaptic role for GSK3A in limiting CA1 hippocampal LTP, distinct from GSK3B.\",\n      \"evidence\": \"Conditional CaMK2a-Cre Gsk3a and Gsk3b KO mice, hippocampal slice electrophysiology\",\n      \"pmids\": [\"35782378\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Synaptic GSK3A substrates mediating LTP restraint not identified\", \"Behavioral consequences not tested here\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placed GSK3A protein levels under translational control by MYCT1/RACK1 within the hepatic glycogen shunt.\",\n      \"evidence\": \"Global Myct1 KO mice, liver glycogen assays, RACK1-dependent translation analysis, Western blot\",\n      \"pmids\": [\"35281731\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect translational control of GSK3A not fully resolved\", \"GSK3A kinase function in glycogen metabolism not directly assayed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mapped a SARS-CoV-2 N-protein variant (R203K/G204R) that enhances GSK3A binding and adjacent S206 phosphorylation, linking host kinase recruitment to viral mutation.\",\n      \"evidence\": \"Comparative biochemical analysis, co-IP with GSK3A, phosphosite mapping of mutant vs WT N protein\",\n      \"pmids\": [\"35105893\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence for viral fitness not demonstrated\", \"Single biochemical study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified GSK3A as a regulator of nuclear architecture, with its inhibition increasing cohesin-dependent long-range chromatin looping.\",\n      \"evidence\": \"HiDRO high-throughput Oligopaint imaging screen with GSK3A inhibition and cohesin-dependence validation\",\n      \"pmids\": [\"37438531\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Chromatin/cohesin substrate of GSK3A not identified\", \"Whether effect is direct or via WNT not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a tumor immune-evasion mechanism in HCC whereby GSK3A drives neutrophil recruitment and NET formation via LRG1 to suppress CTLs.\",\n      \"evidence\": \"In vivo CRISPR screen, flow cytometry, neutrophil RNA-seq, Gsk3a KO HCC model\",\n      \"pmids\": [\"39174053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GSK3A substrate upstream of LRG1 not identified\", \"Single tumor model\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Validated GSK3A as a direct molecular target of quercetin, providing a pharmacological handle and stabilization mechanism.\",\n      \"evidence\": \"CETSA-MS, Western blot, molecular docking, site-directed mutagenesis, pull-down assays\",\n      \"pmids\": [\"38342014\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Effect of quercetin on GSK3A kinase activity not established\", \"Cellular phenotype of stabilization not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified CCDC28A as a sperm interactor of GSK3A with phenotypically overlapping knockouts, nominating a fertility-relevant complex.\",\n      \"evidence\": \"Co-immunoprecipitation and Ccdc28a KO mouse sperm morphology/motility analysis\",\n      \"pmids\": [\"38597936\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single co-IP without reciprocal/structural validation\", \"Phenotypic overlap is indirect evidence for functional connection\", \"Whether CCDC28A is a GSK3A substrate unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Dissected GSK3A's role in the \\u03b2-catenin destruction complex, showing it phosphorylates \\u03b2-catenin with APC/AXIN1 and is antagonized by HUWE1, including a \\u03b2-catenin-stability-independent output.\",\n      \"evidence\": \"CSNK1A1 KO cells, HUWE1 KO, phospho-resistant CTNNB1 knockin, genetic interaction and WNT reporter assays\",\n      \"pmids\": [\"40424469\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GSK3A vs GSK3B contributions within the complex not separated\", \"Nature of the stability-independent WNT mechanism not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated GSK3A kinase activity supports adenovirus replication through direct phosphorylation of L4-22K, mapping the kinase-domain interaction.\",\n      \"evidence\": \"cDNA gain-of-function screen, kinase-dead mutants, phosphoproteomics, co-IP, domain mapping\",\n      \"pmids\": [\"40537285\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of L4-22K phosphorylation not tested\", \"Whether this generalizes to other adenovirus serotypes unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved which direct GSK3A substrates underlie its isoform-specific phenotypes (sperm motility, LTP limitation, T-cell immunity, chromatin looping), and how GSK3A activity and substrate selection are differentially controlled from GSK3B.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No GSK3A-unique substrate has been assigned to its non-redundant neuronal or immune phenotypes\", \"Structural/regulatory basis for GSK3A vs GSK3B substrate discrimination not defined\", \"Whether chromatin and metabolic roles are direct kinase actions remains open\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 2, 18, 22, 30, 3]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [4, 22, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [30, 12, 9]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [14, 21, 16]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [18, 27]}\n    ],\n    \"complexes\": [\"\\u03b2-catenin destruction complex (APC/AXIN1/GSK3)\"],\n    \"partners\": [\"CTNNB1\", \"AXIN1\", \"APC\", \"HUWE1\", \"DEAF1\", \"MYC\", \"CCDC28A\", \"RelA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}