{"gene":"MARK1","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":1995,"finding":"A novel 110-kDa serine/threonine kinase (p110mark, later named MARK1) was purified from brain tissue and shown to specifically phosphorylate tau at KXGS motifs within the repeat domain (primarily Ser262), causing dramatic reduction of tau's affinity for microtubules and inducing microtubule dynamic instability in vitro.","method":"Protein purification from brain, in vitro kinase assay, microtubule co-sedimentation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — original biochemical reconstitution with purified kinase and substrate, rigorous in vitro assay","pmids":["7706316"],"is_preprint":false},{"year":1997,"finding":"MARK1 and MARK2 (cloned from rat) phosphorylate microtubule-associated proteins tau, MAP2, and MAP4 on KXGS motifs in their microtubule-binding domains, causing dissociation from microtubules and increased microtubule dynamics; overexpression of MARK in cells leads to hyperphosphorylation of MAPs, disruption of the microtubule array, morphological changes, and cell death. Catalytic activity depends on phosphorylation of two residues in subdomain VIII.","method":"Molecular cloning, in vitro kinase assay, cell overexpression with immunofluorescence microscopy","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (biochemical reconstitution, mutagenesis of activation loop, cell biology), foundational paper with >700 citations","pmids":["9108484"],"is_preprint":false},{"year":1999,"finding":"MARK phosphorylation of tau at Ser262 (KXGS motif) and Ser214 strongly reduces tau's affinity for microtubules but, contrary to expectations, simultaneously inhibits tau's assembly into paired helical filaments (PHFs), demonstrating that MARK-mediated phosphorylation uncouples microtubule detachment from pathological aggregation.","method":"In vitro kinase assay with MARK, PHF assembly assay, phosphopeptide analysis","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with multiple kinases and functional aggregation assay","pmids":["10090741"],"is_preprint":false},{"year":2004,"finding":"LKB1 (in complex with STRAD and MO25) phosphorylates the T-loop threonine of MARK1 (and MARK2, MARK3, MARK4 and eight other AMPK-related kinases), increasing their activity >50-fold. Mutation of the T-loop Thr to Ala prevents activation; mutation to Glu produces constitutively active forms. Endogenous MARK1 activity is markedly reduced in LKB1-deficient cells, establishing LKB1 as the master upstream kinase for MARK1.","method":"In vitro kinase assay, site-directed mutagenesis of T-loop, LKB1-deficient cell lines","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro reconstitution, mutagenesis, and genetic validation in LKB1-null cells; >1,100 citations","pmids":["14976552"],"is_preprint":false},{"year":2007,"finding":"H. pylori virulence protein CagA physically interacts with PAR1/MARK kinase (including MARK1-family members) via a direct protein–protein interaction. CagA binding inhibits PAR1 kinase activity and prevents atypical PKC (aPKC)-mediated phosphorylation of PAR1 (which normally dissociates PAR1 from the membrane), collectively causing junctional and polarity defects. PAR1's multimeric nature also promotes CagA multimerization, stabilizing the CagA–SHP2 interaction, and induction of the hummingbird phenotype by CagA requires simultaneous PAR1 kinase inhibition.","method":"Co-immunoprecipitation, in vitro kinase assay, dominant-negative and constitutively active constructs, cell polarity assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 — reciprocal Co-IP, in vitro activity assay, multiple cell-based functional readouts; >400 citations","pmids":["17507984"],"is_preprint":false},{"year":2008,"finding":"MARK1 overexpression and siRNA-mediated silencing both result in significantly shorter dendrite length in mouse neocortical neurons, and MARK1 overexpression modifies dendritic transport speed. MARK1 is involved in axon–dendrite specification (consistent with its role as a Par-1 ortholog), and an ASD-associated SNP (rs12410279) modulates MARK1 transcription levels.","method":"Neuronal overexpression and siRNA knockdown, live-cell imaging of dendritic morphology and transport","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct loss- and gain-of-function with defined neuronal phenotype, single lab","pmids":["18492799"],"is_preprint":false},{"year":2011,"finding":"Death-associated protein kinase (DAPK) activates MARK1 and MARK2 by binding to their spacer region via its death domain (not its catalytic domain), disrupting an intramolecular autoinhibitory interaction within MARK1/2. This DAPK-mediated activation of MARK1/2 leads to tau and MAP2/4 phosphorylation and inhibition of microtubule assembly. DAPK−/− mouse brain shows reduced tau phosphorylation, and DAPK enhances MARK2's effect on polarized neurite outgrowth. In a Drosophila tauopathy model, DAPK acts through the MARK ortholog PAR-1 to induce neurodegeneration.","method":"Co-immunoprecipitation, in vitro kinase assay, domain-deletion mutagenesis, DAPK knockout mouse brain analysis, Drosophila genetic epistasis","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (biochemical, genetic KO, Drosophila epistasis) across two organisms","pmids":["21311567"],"is_preprint":false},{"year":2013,"finding":"A kinome RNAi screen identified LKB1 as a Hippo pathway component; LKB1 acts through MARK-family kinases to regulate the localization of the polarity determinant Scribble and the activity of core Hippo kinases (LATS1/2), thereby controlling YAP activity. This defines a LKB1–MARK–Scribble–Hippo–YAP signaling axis relevant to LKB1 tumor suppressor function.","method":"RNAi kinome screen, epistasis experiments, immunofluorescence localization, YAP reporter assays","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis screen with functional validation, but MARK1 specifically not always distinguished from family members","pmids":["24362629"],"is_preprint":false},{"year":2016,"finding":"The C-terminal KA1 (kinase-associated-1) domain of human MARK1 directly interacts with and autoinhibits the MARK1 kinase domain. Mutagenesis identified specific KA1 residues required for autoinhibition that are identical to residues required for anionic phospholipid binding. Membrane-targeted 'mini' MARK1 becomes activated upon association with vesicles containing anionic phospholipids, but only when a second membrane-targeting signal is also present, establishing a two-signal coincidence detection mechanism for MARK1 activation at membranes.","method":"Site-directed mutagenesis, in vitro kinase activity assay, lipid vesicle binding and activation assay","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis and lipid activation assay, mechanistic dissection of autoinhibition","pmids":["27879374"],"is_preprint":false},{"year":2018,"finding":"MARK1 is a direct functional target of miR-125a-5p in cervical tumor cells. miR-125a-5p directly represses MARK1 protein expression via a binding site in the MARK1 3'-UTR (validated by luciferase assay). siRNA-mediated knockdown of MARK1 enhances migration of HeLa and C-33A cervical cancer cells, indicating that MARK1 suppresses cell migration in this context.","method":"Luciferase reporter assay, siRNA knockdown, transwell migration assay","journal":"MicroRNA","confidence":"Medium","confidence_rationale":"Tier 2–3 — luciferase validation of direct miRNA–3'UTR interaction plus functional siRNA phenotype, single lab","pmids":["29076440"],"is_preprint":false}],"current_model":"MARK1 is a serine/threonine kinase that phosphorylates microtubule-associated proteins (tau, MAP2, MAP4) at KXGS motifs, destabilizing microtubule interactions; it is activated by LKB1-mediated T-loop phosphorylation and by anionic phospholipids that relieve KA1-domain autoinhibition, can be further activated by DAPK binding to its spacer region, is inhibited by H. pylori CagA binding, and functions downstream of LKB1 to regulate cell polarity, neuronal morphology, the Hippo-YAP pathway, and cell migration."},"narrative":{"teleology":[{"year":1995,"claim":"Identification of MARK1 as a tau kinase resolved the question of which kinase phosphorylates the KXGS motifs critical for tau–microtubule binding, establishing MARK1's core biochemical activity.","evidence":"Purification of a 110-kDa kinase from brain with in vitro kinase and microtubule co-sedimentation assays","pmids":["7706316"],"confidence":"High","gaps":["No in vivo validation of microtubule destabilization","Substrate specificity beyond tau not yet tested"]},{"year":1997,"claim":"Cloning of MARK1/MARK2 and demonstration that they phosphorylate tau, MAP2, and MAP4 broadened substrate scope and showed that MAP phosphorylation disrupts the microtubule array in cells, establishing the cellular consequence of MARK activity.","evidence":"Molecular cloning, in vitro kinase assays, cell overexpression with immunofluorescence","pmids":["9108484"],"confidence":"High","gaps":["Mechanism of MARK1 activation in vivo unknown","Physiological context (which tissues, which signaling cues) not defined"]},{"year":1999,"claim":"Showing that MARK-mediated tau phosphorylation inhibits paired helical filament assembly decoupled microtubule detachment from pathological aggregation, reframing the role of KXGS phosphorylation in tauopathy.","evidence":"In vitro kinase assay coupled with PHF assembly assay","pmids":["10090741"],"confidence":"High","gaps":["Relevance to in vivo tauopathy progression not tested","Effect of combinatorial phosphorylation by other kinases on aggregation unclear"]},{"year":2004,"claim":"Identification of LKB1 as the upstream activating kinase for MARK1 via T-loop phosphorylation resolved the long-standing question of how MARK1 is switched on, linking it to the AMPK-related kinase signaling network.","evidence":"In vitro kinase assay, T-loop mutagenesis, LKB1-deficient cell lines","pmids":["14976552"],"confidence":"High","gaps":["Whether additional kinases can activate MARK1 in LKB1-independent contexts not addressed","Structural basis of LKB1–MARK1 interaction unknown"]},{"year":2007,"claim":"Discovery that H. pylori CagA directly binds and inhibits MARK1/PAR1 kinase activity revealed a pathogen-mediated hijacking of polarity signaling and showed that MARK1 inhibition is required for the CagA-induced hummingbird phenotype.","evidence":"Reciprocal co-immunoprecipitation, in vitro kinase inhibition, dominant-negative constructs, cell polarity assays","pmids":["17507984"],"confidence":"High","gaps":["Structural details of CagA–MARK1 interface unresolved","Whether CagA selectively targets MARK1 versus other MARK paralogs not fully dissected"]},{"year":2008,"claim":"Demonstrating that both overexpression and knockdown of MARK1 alter dendrite length established a dosage-sensitive role in neuronal morphogenesis and linked MARK1 to axon–dendrite specification.","evidence":"Overexpression and siRNA knockdown in mouse neocortical neurons with live-cell imaging","pmids":["18492799"],"confidence":"Medium","gaps":["Downstream substrates mediating dendritic effects beyond tau/MAP2 not identified","In vivo knockout phenotype in mammalian brain not reported","ASD-associated SNP functional effect based on association, not causation"]},{"year":2011,"claim":"Showing that DAPK activates MARK1/2 by binding the spacer region and relieving autoinhibition identified a second activation mechanism independent of T-loop phosphorylation and connected MARK1 to the DAPK–tau phosphorylation–neurodegeneration axis.","evidence":"Co-IP, domain-deletion mutagenesis, DAPK knockout mouse brain, Drosophila genetic epistasis","pmids":["21311567"],"confidence":"High","gaps":["Whether DAPK and LKB1 activation act synergistically or redundantly in neurons not tested","Physiological signals triggering DAPK-mediated MARK activation not defined"]},{"year":2013,"claim":"Placing MARK kinases between LKB1 and the Hippo–YAP pathway via Scribble relocalization expanded MARK function beyond microtubule regulation into growth-control signaling and tumor suppression.","evidence":"RNAi kinome screen, epistasis experiments, YAP reporter assays","pmids":["24362629"],"confidence":"Medium","gaps":["Specific contribution of MARK1 versus other MARK paralogs not resolved","Direct phosphorylation substrates linking MARK to Scribble relocalization unknown"]},{"year":2016,"claim":"Biochemical dissection of KA1-domain autoinhibition and its relief by anionic phospholipids established a coincidence-detection mechanism for MARK1 activation at membranes, unifying membrane recruitment with kinase activation.","evidence":"Site-directed mutagenesis, in vitro kinase assay, lipid vesicle binding and activation assay","pmids":["27879374"],"confidence":"High","gaps":["Identity of the physiological membrane compartment that activates MARK1 in vivo not established","No full-length structural model of autoinhibited MARK1"]},{"year":2018,"claim":"Identification of MARK1 as a direct miR-125a-5p target whose knockdown promotes cervical cancer cell migration defined MARK1 as a suppressor of cell migration and connected it to post-transcriptional regulation in a cancer context.","evidence":"Luciferase 3′-UTR reporter assay, siRNA knockdown, transwell migration assay in HeLa and C-33A cells","pmids":["29076440"],"confidence":"Medium","gaps":["Mechanism by which MARK1 loss promotes migration not elucidated","Relevance to cervical cancer in vivo not confirmed","Single-lab finding without independent replication"]},{"year":null,"claim":"Key open questions include the full-length structure of autoinhibited MARK1, the identity of its physiological membrane activating compartment, the specific substrates mediating its roles in Hippo signaling and neuronal polarity beyond MAPs, and the individual contributions of MARK1 versus other MARK paralogs in each biological context.","evidence":"","pmids":[],"confidence":"High","gaps":["No full-length crystal or cryo-EM structure of autoinhibited MARK1","Paralog-specific knockout phenotypes in mammals not reported","Direct substrates in Hippo–YAP axis unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,2,3,6]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[8]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,7]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5]}],"complexes":[],"partners":["LKB1","DAPK","CAGA","TAU","MAP2","MAP4","SCRIBBLE"],"other_free_text":[]},"mechanistic_narrative":"MARK1 is a serine/threonine kinase that phosphorylates microtubule-associated proteins (tau, MAP2, MAP4) at KXGS motifs within their microtubule-binding domains, reducing their affinity for microtubules and increasing microtubule dynamic instability [PMID:7706316, PMID:9108484]. MARK1 is activated by LKB1-mediated phosphorylation of its T-loop threonine and by DAPK binding to its spacer region, which relieves an intramolecular autoinhibitory interaction between the C-terminal KA1 domain and the kinase domain; this autoinhibition can also be relieved by anionic phospholipids through a coincidence-detection mechanism at membranes [PMID:14976552, PMID:21311567, PMID:27879374]. Downstream of LKB1, MARK-family kinases regulate the Hippo–YAP pathway through Scribble relocalization [PMID:24362629], and MARK1 controls dendritic morphology and axon–dendrite specification in cortical neurons [PMID:18492799]. The H. pylori virulence factor CagA directly binds and inhibits MARK1/PAR1 kinase activity, disrupting epithelial cell polarity [PMID:17507984]."},"prefetch_data":{"uniprot":{"accession":"Q9P0L2","full_name":"Serine/threonine-protein kinase MARK1","aliases":["MAP/microtubule affinity-regulating kinase 1","PAR1 homolog c","Par-1c","Par1c"],"length_aa":795,"mass_kda":89.0,"function":"Serine/threonine-protein kinase (PubMed:23666762). Involved in cell polarity and microtubule dynamics regulation. Phosphorylates DCX, MAP2 and MAP4. Phosphorylates the microtubule-associated protein MAPT/TAU (PubMed:23666762). Involved in cell polarity by phosphorylating the microtubule-associated proteins MAP2, MAP4 and MAPT/TAU at KXGS motifs, causing detachment from microtubules, and their disassembly. Involved in the regulation of neuronal migration through its dual activities in regulating cellular polarity and microtubule dynamics, possibly by phosphorylating and regulating DCX. Also acts as a positive regulator of the Wnt signaling pathway, probably by mediating phosphorylation of dishevelled proteins (DVL1, DVL2 and/or DVL3)","subcellular_location":"Cell membrane; Cytoplasm, cytoskeleton; Cytoplasm; Cell projection, dendrite","url":"https://www.uniprot.org/uniprotkb/Q9P0L2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MARK1","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"UTRN","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/MARK1","total_profiled":1310},"omim":[{"mim_id":"610836","title":"AUTISM, SUSCEPTIBILITY TO, 11; AUTS11","url":"https://www.omim.org/entry/610836"},{"mim_id":"610266","title":"TAO KINASE 1; TAOK1","url":"https://www.omim.org/entry/610266"},{"mim_id":"606511","title":"MAP/MICROTUBULE AFFINITY-REGULATING KINASE 1; MARK1","url":"https://www.omim.org/entry/606511"},{"mim_id":"157140","title":"MICROTUBULE-ASSOCIATED PROTEIN TAU; MAPT","url":"https://www.omim.org/entry/157140"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MARK1"},"hgnc":{"alias_symbol":["MARK","PAR-1C"],"prev_symbol":[]},"alphafold":{"accession":"Q9P0L2","domains":[{"cath_id":"3.30.200.20","chopping":"57-138","consensus_level":"medium","plddt":93.1254,"start":57,"end":138},{"cath_id":"1.10.510.10","chopping":"143-312","consensus_level":"high","plddt":92.1915,"start":143,"end":312},{"cath_id":"1.10.8.10","chopping":"334-370","consensus_level":"medium","plddt":95.5451,"start":334,"end":370},{"cath_id":"3.30.310.80","chopping":"710-793","consensus_level":"high","plddt":91.8485,"start":710,"end":793}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P0L2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P0L2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P0L2-F1-predicted_aligned_error_v6.png","plddt_mean":67.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MARK1","jax_strain_url":"https://www.jax.org/strain/search?query=MARK1"},"sequence":{"accession":"Q9P0L2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9P0L2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9P0L2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P0L2"}},"corpus_meta":[{"pmid":"21248841","id":"PMC_21248841","title":"The Polycomb complex PRC2 and its mark in life.","date":"2011","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/21248841","citation_count":2626,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"16403636","id":"PMC_16403636","title":"Genomic DNA methylation: the mark and its mediators.","date":"2006","source":"Trends in biochemical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/16403636","citation_count":1759,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22473383","id":"PMC_22473383","title":"Histone methylation: a dynamic mark in health, disease and inheritance.","date":"2012","source":"Nature reviews. 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N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/33060197","citation_count":564,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10090741","id":"PMC_10090741","title":"Phosphorylation that detaches tau protein from microtubules (Ser262, Ser214) also protects it against aggregation into Alzheimer paired helical filaments.","date":"1999","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10090741","citation_count":475,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15489334","id":"PMC_15489334","title":"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).","date":"2004","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/15489334","citation_count":438,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35271311","id":"PMC_35271311","title":"OpenCell: Endogenous tagging for the cartography of human cellular organization.","date":"2022","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/35271311","citation_count":432,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16344560","id":"PMC_16344560","title":"Diversification of transcriptional modulation: large-scale identification and characterization of putative alternative promoters of human genes.","date":"2005","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/16344560","citation_count":409,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24255178","id":"PMC_24255178","title":"Protein interaction network of the mammalian Hippo pathway reveals mechanisms of kinase-phosphatase interactions.","date":"2013","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/24255178","citation_count":383,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9832145","id":"PMC_9832145","title":"New phosphorylation sites identified in hyperphosphorylated tau (paired helical filament-tau) from Alzheimer's disease brain using nanoelectrospray mass spectrometry.","date":"1998","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9832145","citation_count":348,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"7706316","id":"PMC_7706316","title":"Microtubule-associated protein/microtubule affinity-regulating kinase (p110mark). A novel protein kinase that regulates tau-microtubule interactions and dynamic instability by phosphorylation at the Alzheimer-specific site serine 262.","date":"1995","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7706316","citation_count":345,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34079125","id":"PMC_34079125","title":"A proximity-dependent biotinylation map of a human cell.","date":"2021","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/34079125","citation_count":339,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10737616","id":"PMC_10737616","title":"Phosphorylation sites on tau identified by nanoelectrospray mass spectrometry: differences in vitro between the mitogen-activated protein kinases ERK2, c-Jun N-terminal kinase and P38, and glycogen synthase kinase-3beta.","date":"2000","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10737616","citation_count":324,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9735171","id":"PMC_9735171","title":"Phosphorylation of tau at both Thr 231 and Ser 262 is required for maximal inhibition of its binding to microtubules.","date":"1998","source":"Archives of biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/9735171","citation_count":293,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9614189","id":"PMC_9614189","title":"The endogenous and cell cycle-dependent phosphorylation of tau protein in living cells: implications for Alzheimer's disease.","date":"1998","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/9614189","citation_count":259,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24362629","id":"PMC_24362629","title":"A genetic screen identifies an LKB1-MARK signalling axis controlling the Hippo-YAP pathway.","date":"2013","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/24362629","citation_count":248,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21988832","id":"PMC_21988832","title":"Toward an understanding of the protein interaction network of the human liver.","date":"2011","source":"Molecular systems biology","url":"https://pubmed.ncbi.nlm.nih.gov/21988832","citation_count":207,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12387894","id":"PMC_12387894","title":"Involvement of aberrant glycosylation in phosphorylation of tau by cdk5 and GSK-3beta.","date":"2002","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/12387894","citation_count":172,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9771888","id":"PMC_9771888","title":"Tau is phosphorylated by GSK-3 at several sites found in Alzheimer disease and its biological activity markedly inhibited only after it is prephosphorylated by A-kinase.","date":"1998","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/9771888","citation_count":170,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":38542,"output_tokens":2204,"usd":0.074343},"stage2":{"model":"claude-opus-4-6","input_tokens":5492,"output_tokens":2117,"usd":0.120578},"total_usd":0.443388,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":51604,"output_tokens":3297,"usd":0.102134},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6341,"output_tokens":2634,"usd":0.146333}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"H. pylori CagA specifically interacts with PAR1/MARK kinase (including MARK1 family members), inhibits PAR1 kinase activity, and prevents atypical PKC (aPKC)-mediated PAR1 phosphorylation, thereby disrupting tight junction integrity and apical-basolateral polarity in epithelial cells. CagA multimerization promoted by PAR1 also stabilizes the CagA-SHP2 interaction, and induction of the hummingbird phenotype by CagA-activated SHP2 requires simultaneous PAR1 inhibition.\",\n      \"method\": \"Co-immunoprecipitation, kinase activity assays, phosphorylation assays, cell morphology/polarity readouts\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with kinase activity and polarity phenotype readouts, published in high-impact journal\",\n      \"pmids\": [\"17507984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MARK/PAR-1 family kinases (including MARK1) phosphorylate tau protein and related microtubule-associated proteins (MAPs such as MAP2/4), thereby regulating microtubule dynamics. The x-ray crystal structure of human MARKs has been determined, providing mechanistic insight into kinase activity regulation.\",\n      \"method\": \"In vitro phosphorylation assays, X-ray crystallography, review of accumulated biochemical data\",\n      \"journal\": \"Trends in biochemical sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with in vitro kinase assays, strongly replicated across the field\",\n      \"pmids\": [\"19559622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Members of the KIN1/PAR-1/MARK kinase family, including MARK1, share conserved structural organization and function at the crossroads of cell polarity, cell cycle control, intracellular signaling, microtubule stability, and protein stability.\",\n      \"method\": \"Biochemical and genetic characterization, structural analysis\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review summarizing accumulated genetic and biochemical evidence across the family\",\n      \"pmids\": [\"15182702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Death-associated protein kinase (DAPK) activates MARK1 and MARK2 by binding to the MARK1/2 spacer region through its death domain (not its catalytic activity), thereby disrupting an intramolecular inhibitory interaction within MARK1/2. Activated MARK1/2 then phosphorylates tau and MAP2/4, destabilizing microtubules, inhibiting MT assembly, and modulating neuronal differentiation and polarized neurite outgrowth.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assays, phosphorylation assays, neuronal morphology/polarity readouts, Drosophila genetic model of tauopathy\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus in vitro kinase assay plus mutagenesis plus neuronal phenotype plus Drosophila epistasis, multiple orthogonal methods in one study\",\n      \"pmids\": [\"21311567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LKB1 and its downstream targets SAD/MARK kinases (mammalian homologs of Par-1, including MARK1) act as key regulators of neuronal polarization and axon development. LKB1 activates MARK kinases, and this pathway is modulated by cAMP/cGMP second messengers and regulates axon/dendrite specification in cultured and in vivo cortical neurons.\",\n      \"method\": \"Genetic knockdown/overexpression in cultured hippocampal neurons and in vivo cortical neurons, epistasis analysis\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined neuronal polarity phenotype and pathway placement via LKB1 epistasis\",\n      \"pmids\": [\"21416623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MARK1 overexpression and silencing both result in significantly shorter dendrite length in mouse neocortical neurons and modify dendritic transport speed. MARK1 is involved in axon-dendrite specification as expected for a Par-1 kinase family member.\",\n      \"method\": \"Overexpression and siRNA-mediated silencing in mouse neocortical neurons, morphometric analysis of dendrite length, live imaging of dendritic transport\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD/OE with defined cellular phenotype (dendritic length and transport speed) in primary neurons\",\n      \"pmids\": [\"18492799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Par-1b/MARK2 (closely related to MARK1) regulates metabolic rate, adiposity, and insulin sensitivity in knockout mice, revealing a metabolic function for the Par-1/MARK kinase subfamily akin to AMPK.\",\n      \"method\": \"Knockout mouse phenotyping, metabolic measurements\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — knockout phenotype in a paralog (MARK2), not MARK1 directly; indirect relevance\",\n      \"pmids\": [\"17721078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The KA1 (kinase-associated-1) domain at the C-terminus of human MARK1 directly interacts with and inhibits the MARK1 kinase domain in an intramolecular autoinhibitory mechanism. Residues required for autoinhibition overlap with those required for anionic phospholipid binding. Association with vesicles containing anionic phospholipids activates a 'mini' MARK1 construct, but only when the protein is also targeted to the membrane by a second signal, indicating dual-signal requirement for membrane-based activation.\",\n      \"method\": \"Site-directed mutagenesis, in vitro kinase assays, vesicle-binding assays, domain deletion/interaction studies\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis identifying specific autoinhibitory residues and phospholipid activation mechanism\",\n      \"pmids\": [\"27879374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MARK1 is a direct functional target of miR-125a-5p in cervical tumor cells. miR-125a-5p binds the 3'-UTR of MARK1 mRNA and represses MARK1 protein expression. Inhibition of MARK1 (by miR-125a-5p mimics or siRNA knockdown) stimulates cell migration in HeLa and C-33A cervical tumor cells.\",\n      \"method\": \"Luciferase 3'-UTR reporter assay, siRNA knockdown, transwell migration assay, RT-PCR and western blot\",\n      \"journal\": \"MicroRNA\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — luciferase reporter validation plus siRNA phenocopy with migration assay readout\",\n      \"pmids\": [\"29076440\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MARK1 is a serine/threonine kinase that phosphorylates tau and related microtubule-associated proteins (MAPs) to regulate microtubule dynamics; its activity is controlled by intramolecular autoinhibition through its C-terminal KA1 domain (which also mediates anionic phospholipid binding and membrane-dependent activation), is activated upstream by DAPK (via death domain binding to the MARK1 spacer region) and LKB1, is inhibited by H. pylori CagA binding, and plays essential roles in neuronal polarity, axon-dendrite specification, and dendritic morphology and transport.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\nMost papers in the retrieved corpus (papers 1-100) are about epigenetic marks, histone modifications, DNA methylation, etc. — completely unrelated to MARK1 kinase. The only MARK1-relevant papers in the retrieved corpus are:\n\n- **Paper 11**: H. pylori CagA targets PAR1/MARK kinase — KEEP (directly about MARK/PAR-1 kinase)\n- **Paper 21**: \"The tau of MARK\" review — KEEP (directly about MARK kinases including MARK1)\n- **Paper 40**: KIN1/PAR-1/MARK kinase family overview — KEEP\n- **Paper 53**: DAPK activates MARK1/2 — KEEP (directly names MARK1)\n- **Paper 56**: MARK1 susceptibility gene for autism — KEEP (directly about MARK1, neuronal function)\n- **Paper 61**: Par-1/MARK family review — KEEP\n- **Paper 67**: LKB1-SAD/MARK pathway in neuronal polarization — KEEP\n- **Paper 96**: MARK1 is a novel target for miR-125a-5p — KEEP (directly about MARK1)\n- **Paper 99**: KA1 domain-mediated autoinhibition of MARK1 — KEEP (directly about MARK1)\n\nFrom the gene2pubmed corpus:\n- **Paper 3** (PMID:14976552): LKB1 activates MARK/PAR-1 — KEEP\n- **Paper 9** (PMID:9108484): MARK family discovery paper — KEEP\n- **Paper 16** (PMID:10090741): MARK phosphorylation of tau — KEEP\n- **Paper 22** (PMID:7706316): p110mark original discovery — KEEP\n- **Paper 27** (PMID:24362629): LKB1-MARK-Hippo-YAP axis — KEEP\n\nAll others are EXCLUDE (off-topic epigenetics, interactome maps without MARK1-specific findings, tau phosphorylation by other kinases without MARK1-specific mechanistic detail, cDNA sequencing projects, etc.).\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"A novel 110-kDa serine/threonine kinase (p110mark, later named MARK1) was purified from brain tissue and shown to specifically phosphorylate tau at KXGS motifs within the repeat domain (primarily Ser262), causing dramatic reduction of tau's affinity for microtubules and inducing microtubule dynamic instability in vitro.\",\n      \"method\": \"Protein purification from brain, in vitro kinase assay, microtubule co-sedimentation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original biochemical reconstitution with purified kinase and substrate, rigorous in vitro assay\",\n      \"pmids\": [\"7706316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MARK1 and MARK2 (cloned from rat) phosphorylate microtubule-associated proteins tau, MAP2, and MAP4 on KXGS motifs in their microtubule-binding domains, causing dissociation from microtubules and increased microtubule dynamics; overexpression of MARK in cells leads to hyperphosphorylation of MAPs, disruption of the microtubule array, morphological changes, and cell death. Catalytic activity depends on phosphorylation of two residues in subdomain VIII.\",\n      \"method\": \"Molecular cloning, in vitro kinase assay, cell overexpression with immunofluorescence microscopy\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (biochemical reconstitution, mutagenesis of activation loop, cell biology), foundational paper with >700 citations\",\n      \"pmids\": [\"9108484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"MARK phosphorylation of tau at Ser262 (KXGS motif) and Ser214 strongly reduces tau's affinity for microtubules but, contrary to expectations, simultaneously inhibits tau's assembly into paired helical filaments (PHFs), demonstrating that MARK-mediated phosphorylation uncouples microtubule detachment from pathological aggregation.\",\n      \"method\": \"In vitro kinase assay with MARK, PHF assembly assay, phosphopeptide analysis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with multiple kinases and functional aggregation assay\",\n      \"pmids\": [\"10090741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LKB1 (in complex with STRAD and MO25) phosphorylates the T-loop threonine of MARK1 (and MARK2, MARK3, MARK4 and eight other AMPK-related kinases), increasing their activity >50-fold. Mutation of the T-loop Thr to Ala prevents activation; mutation to Glu produces constitutively active forms. Endogenous MARK1 activity is markedly reduced in LKB1-deficient cells, establishing LKB1 as the master upstream kinase for MARK1.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis of T-loop, LKB1-deficient cell lines\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro reconstitution, mutagenesis, and genetic validation in LKB1-null cells; >1,100 citations\",\n      \"pmids\": [\"14976552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"H. pylori virulence protein CagA physically interacts with PAR1/MARK kinase (including MARK1-family members) via a direct protein–protein interaction. CagA binding inhibits PAR1 kinase activity and prevents atypical PKC (aPKC)-mediated phosphorylation of PAR1 (which normally dissociates PAR1 from the membrane), collectively causing junctional and polarity defects. PAR1's multimeric nature also promotes CagA multimerization, stabilizing the CagA–SHP2 interaction, and induction of the hummingbird phenotype by CagA requires simultaneous PAR1 kinase inhibition.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, dominant-negative and constitutively active constructs, cell polarity assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reciprocal Co-IP, in vitro activity assay, multiple cell-based functional readouts; >400 citations\",\n      \"pmids\": [\"17507984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MARK1 overexpression and siRNA-mediated silencing both result in significantly shorter dendrite length in mouse neocortical neurons, and MARK1 overexpression modifies dendritic transport speed. MARK1 is involved in axon–dendrite specification (consistent with its role as a Par-1 ortholog), and an ASD-associated SNP (rs12410279) modulates MARK1 transcription levels.\",\n      \"method\": \"Neuronal overexpression and siRNA knockdown, live-cell imaging of dendritic morphology and transport\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct loss- and gain-of-function with defined neuronal phenotype, single lab\",\n      \"pmids\": [\"18492799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Death-associated protein kinase (DAPK) activates MARK1 and MARK2 by binding to their spacer region via its death domain (not its catalytic domain), disrupting an intramolecular autoinhibitory interaction within MARK1/2. This DAPK-mediated activation of MARK1/2 leads to tau and MAP2/4 phosphorylation and inhibition of microtubule assembly. DAPK−/− mouse brain shows reduced tau phosphorylation, and DAPK enhances MARK2's effect on polarized neurite outgrowth. In a Drosophila tauopathy model, DAPK acts through the MARK ortholog PAR-1 to induce neurodegeneration.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, domain-deletion mutagenesis, DAPK knockout mouse brain analysis, Drosophila genetic epistasis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (biochemical, genetic KO, Drosophila epistasis) across two organisms\",\n      \"pmids\": [\"21311567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A kinome RNAi screen identified LKB1 as a Hippo pathway component; LKB1 acts through MARK-family kinases to regulate the localization of the polarity determinant Scribble and the activity of core Hippo kinases (LATS1/2), thereby controlling YAP activity. This defines a LKB1–MARK–Scribble–Hippo–YAP signaling axis relevant to LKB1 tumor suppressor function.\",\n      \"method\": \"RNAi kinome screen, epistasis experiments, immunofluorescence localization, YAP reporter assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis screen with functional validation, but MARK1 specifically not always distinguished from family members\",\n      \"pmids\": [\"24362629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The C-terminal KA1 (kinase-associated-1) domain of human MARK1 directly interacts with and autoinhibits the MARK1 kinase domain. Mutagenesis identified specific KA1 residues required for autoinhibition that are identical to residues required for anionic phospholipid binding. Membrane-targeted 'mini' MARK1 becomes activated upon association with vesicles containing anionic phospholipids, but only when a second membrane-targeting signal is also present, establishing a two-signal coincidence detection mechanism for MARK1 activation at membranes.\",\n      \"method\": \"Site-directed mutagenesis, in vitro kinase activity assay, lipid vesicle binding and activation assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis and lipid activation assay, mechanistic dissection of autoinhibition\",\n      \"pmids\": [\"27879374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MARK1 is a direct functional target of miR-125a-5p in cervical tumor cells. miR-125a-5p directly represses MARK1 protein expression via a binding site in the MARK1 3'-UTR (validated by luciferase assay). siRNA-mediated knockdown of MARK1 enhances migration of HeLa and C-33A cervical cancer cells, indicating that MARK1 suppresses cell migration in this context.\",\n      \"method\": \"Luciferase reporter assay, siRNA knockdown, transwell migration assay\",\n      \"journal\": \"MicroRNA\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — luciferase validation of direct miRNA–3'UTR interaction plus functional siRNA phenotype, single lab\",\n      \"pmids\": [\"29076440\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MARK1 is a serine/threonine kinase that phosphorylates microtubule-associated proteins (tau, MAP2, MAP4) at KXGS motifs, destabilizing microtubule interactions; it is activated by LKB1-mediated T-loop phosphorylation and by anionic phospholipids that relieve KA1-domain autoinhibition, can be further activated by DAPK binding to its spacer region, is inhibited by H. pylori CagA binding, and functions downstream of LKB1 to regulate cell polarity, neuronal morphology, the Hippo-YAP pathway, and cell migration.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MARK1 is a serine/threonine kinase of the PAR-1/MARK family that phosphorylates tau and related microtubule-associated proteins (MAP2, MAP4) to regulate microtubule dynamics, cell polarity, and neuronal morphogenesis. Its catalytic activity is held in check by an intramolecular autoinhibitory interaction between the C-terminal KA1 domain and the kinase domain; relief of this autoinhibition occurs through binding of anionic phospholipids at the membrane (requiring a second membrane-targeting signal) or through DAPK, whose death domain binds the MARK1 spacer region to disrupt the inhibitory conformation, while LKB1 serves as an upstream activating kinase [PMID:27879374, PMID:21311567, PMID:21416623]. In neurons, MARK1 is required for proper axon–dendrite specification and dendritic morphology and transport, with both overexpression and depletion shortening dendrites in neocortical neurons [PMID:18492799, PMID:21416623]. Helicobacter pylori CagA hijacks this polarity program by directly binding and inhibiting MARK1 kinase activity and blocking aPKC-mediated MARK1 phosphorylation, thereby disrupting epithelial tight junctions [PMID:17507984].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing that MARK1 belongs to the conserved KIN1/PAR-1/MARK kinase family positioned at the intersection of cell polarity, microtubule stability, and signaling framed the gene's functional context before detailed mechanistic dissection.\",\n      \"evidence\": \"Comparative biochemical and genetic characterization across family members\",\n      \"pmids\": [\"15182702\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No MARK1-specific substrates or activation mechanism defined\",\n        \"Functional redundancy among MARK paralogs not resolved\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that H. pylori CagA directly binds and inhibits PAR1/MARK kinase activity—blocking aPKC phosphorylation and disrupting epithelial tight junctions—revealed that MARK1 is a critical node in epithelial polarity exploited by a bacterial pathogen.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, kinase activity assays, and cell polarity/morphology readouts in epithelial cells\",\n      \"pmids\": [\"17507984\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"CagA-MARK binding interface not mapped at residue level\",\n        \"Relative contributions of individual MARK paralogs to CagA-mediated polarity disruption unclear\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showing that both MARK1 overexpression and silencing shorten dendrites and alter dendritic transport in neocortical neurons established a dosage-sensitive role for MARK1 in neuronal morphogenesis.\",\n      \"evidence\": \"siRNA knockdown and overexpression in mouse neocortical neurons with morphometric and live-imaging readouts\",\n      \"pmids\": [\"18492799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific MARK1 substrates mediating dendritic phenotype not identified\",\n        \"Whether phenotype reflects MAP phosphorylation or other targets unknown\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Crystal structure determination of human MARK kinases, combined with biochemical confirmation that tau and MAP2/4 are direct phosphorylation substrates, provided the first atomic-level view of the catalytic mechanism.\",\n      \"evidence\": \"X-ray crystallography and in vitro phosphorylation assays\",\n      \"pmids\": [\"19559622\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of substrate selectivity among MAPs not fully delineated\",\n        \"Conformational dynamics between active and autoinhibited states not captured\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of two distinct upstream activation mechanisms—DAPK binding the MARK1 spacer region via its death domain to relieve autoinhibition, and LKB1 acting as an activating kinase—defined the signaling hierarchy controlling MARK1 in neuronal polarity and tau phosphorylation.\",\n      \"evidence\": \"Co-immunoprecipitation, in vitro kinase assays, domain mutagenesis, neuronal polarity readouts, Drosophila tauopathy model, and LKB1 epistasis in cortical neurons\",\n      \"pmids\": [\"21311567\", \"21416623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether DAPK and LKB1 act on the same or distinct pools of MARK1 is unknown\",\n        \"Phosphorylation sites on MARK1 placed by LKB1 versus autophosphorylation not fully distinguished in vivo\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Reconstitution of the KA1-domain–mediated autoinhibitory mechanism showed that the same surface of the KA1 domain contacts both the kinase domain (to inhibit) and anionic phospholipids (to activate at membranes), resolving how membrane association can switch MARK1 on—but only when a second membrane-targeting signal is present.\",\n      \"evidence\": \"Site-directed mutagenesis, in vitro kinase assays, and vesicle-binding assays with domain-deletion constructs\",\n      \"pmids\": [\"27879374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the physiological second membrane-targeting signal in cells remains unknown\",\n        \"Full-length MARK1 activation on native membranes not reconstituted\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of MARK1 as a direct target of miR-125a-5p in cervical tumor cells, where MARK1 loss promotes migration, linked MARK1 to a cell-migration-suppressive function outside the nervous system.\",\n      \"evidence\": \"Luciferase 3′-UTR reporter assay, siRNA knockdown phenocopy, and transwell migration assay in HeLa and C-33A cells\",\n      \"pmids\": [\"29076440\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Downstream substrates mediating MARK1's anti-migratory effect not identified\",\n        \"In vivo relevance of MARK1 loss in cervical cancer not tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The physiological identity of the second membrane-targeting signal required for KA1-dependent activation, the full spectrum of MARK1-specific substrates beyond tau/MAP2/MAP4, and whether MARK1 has non-redundant functions versus other MARK paralogs in vivo remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No MARK1-selective knockout phenotype reported in mammals\",\n        \"No proteome-wide substrate identification performed\",\n        \"Structural basis of the full-length autoinhibited-to-active transition not captured\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 3, 7]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 4]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"DAPK1\",\n      \"STK11\",\n      \"MAPT\",\n      \"MAP2\",\n      \"MAP4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"MARK1 is a serine/threonine kinase that phosphorylates microtubule-associated proteins (tau, MAP2, MAP4) at KXGS motifs within their microtubule-binding domains, reducing their affinity for microtubules and increasing microtubule dynamic instability [PMID:7706316, PMID:9108484]. MARK1 is activated by LKB1-mediated phosphorylation of its T-loop threonine and by DAPK binding to its spacer region, which relieves an intramolecular autoinhibitory interaction between the C-terminal KA1 domain and the kinase domain; this autoinhibition can also be relieved by anionic phospholipids through a coincidence-detection mechanism at membranes [PMID:14976552, PMID:21311567, PMID:27879374]. Downstream of LKB1, MARK-family kinases regulate the Hippo–YAP pathway through Scribble relocalization [PMID:24362629], and MARK1 controls dendritic morphology and axon–dendrite specification in cortical neurons [PMID:18492799]. The H. pylori virulence factor CagA directly binds and inhibits MARK1/PAR1 kinase activity, disrupting epithelial cell polarity [PMID:17507984].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Identification of MARK1 as a tau kinase resolved the question of which kinase phosphorylates the KXGS motifs critical for tau–microtubule binding, establishing MARK1's core biochemical activity.\",\n      \"evidence\": \"Purification of a 110-kDa kinase from brain with in vitro kinase and microtubule co-sedimentation assays\",\n      \"pmids\": [\"7706316\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo validation of microtubule destabilization\", \"Substrate specificity beyond tau not yet tested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Cloning of MARK1/MARK2 and demonstration that they phosphorylate tau, MAP2, and MAP4 broadened substrate scope and showed that MAP phosphorylation disrupts the microtubule array in cells, establishing the cellular consequence of MARK activity.\",\n      \"evidence\": \"Molecular cloning, in vitro kinase assays, cell overexpression with immunofluorescence\",\n      \"pmids\": [\"9108484\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of MARK1 activation in vivo unknown\", \"Physiological context (which tissues, which signaling cues) not defined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showing that MARK-mediated tau phosphorylation inhibits paired helical filament assembly decoupled microtubule detachment from pathological aggregation, reframing the role of KXGS phosphorylation in tauopathy.\",\n      \"evidence\": \"In vitro kinase assay coupled with PHF assembly assay\",\n      \"pmids\": [\"10090741\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relevance to in vivo tauopathy progression not tested\", \"Effect of combinatorial phosphorylation by other kinases on aggregation unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of LKB1 as the upstream activating kinase for MARK1 via T-loop phosphorylation resolved the long-standing question of how MARK1 is switched on, linking it to the AMPK-related kinase signaling network.\",\n      \"evidence\": \"In vitro kinase assay, T-loop mutagenesis, LKB1-deficient cell lines\",\n      \"pmids\": [\"14976552\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional kinases can activate MARK1 in LKB1-independent contexts not addressed\", \"Structural basis of LKB1–MARK1 interaction unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that H. pylori CagA directly binds and inhibits MARK1/PAR1 kinase activity revealed a pathogen-mediated hijacking of polarity signaling and showed that MARK1 inhibition is required for the CagA-induced hummingbird phenotype.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, in vitro kinase inhibition, dominant-negative constructs, cell polarity assays\",\n      \"pmids\": [\"17507984\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural details of CagA–MARK1 interface unresolved\", \"Whether CagA selectively targets MARK1 versus other MARK paralogs not fully dissected\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating that both overexpression and knockdown of MARK1 alter dendrite length established a dosage-sensitive role in neuronal morphogenesis and linked MARK1 to axon–dendrite specification.\",\n      \"evidence\": \"Overexpression and siRNA knockdown in mouse neocortical neurons with live-cell imaging\",\n      \"pmids\": [\"18492799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream substrates mediating dendritic effects beyond tau/MAP2 not identified\", \"In vivo knockout phenotype in mammalian brain not reported\", \"ASD-associated SNP functional effect based on association, not causation\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing that DAPK activates MARK1/2 by binding the spacer region and relieving autoinhibition identified a second activation mechanism independent of T-loop phosphorylation and connected MARK1 to the DAPK–tau phosphorylation–neurodegeneration axis.\",\n      \"evidence\": \"Co-IP, domain-deletion mutagenesis, DAPK knockout mouse brain, Drosophila genetic epistasis\",\n      \"pmids\": [\"21311567\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DAPK and LKB1 activation act synergistically or redundantly in neurons not tested\", \"Physiological signals triggering DAPK-mediated MARK activation not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placing MARK kinases between LKB1 and the Hippo–YAP pathway via Scribble relocalization expanded MARK function beyond microtubule regulation into growth-control signaling and tumor suppression.\",\n      \"evidence\": \"RNAi kinome screen, epistasis experiments, YAP reporter assays\",\n      \"pmids\": [\"24362629\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific contribution of MARK1 versus other MARK paralogs not resolved\", \"Direct phosphorylation substrates linking MARK to Scribble relocalization unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Biochemical dissection of KA1-domain autoinhibition and its relief by anionic phospholipids established a coincidence-detection mechanism for MARK1 activation at membranes, unifying membrane recruitment with kinase activation.\",\n      \"evidence\": \"Site-directed mutagenesis, in vitro kinase assay, lipid vesicle binding and activation assay\",\n      \"pmids\": [\"27879374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the physiological membrane compartment that activates MARK1 in vivo not established\", \"No full-length structural model of autoinhibited MARK1\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of MARK1 as a direct miR-125a-5p target whose knockdown promotes cervical cancer cell migration defined MARK1 as a suppressor of cell migration and connected it to post-transcriptional regulation in a cancer context.\",\n      \"evidence\": \"Luciferase 3′-UTR reporter assay, siRNA knockdown, transwell migration assay in HeLa and C-33A cells\",\n      \"pmids\": [\"29076440\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which MARK1 loss promotes migration not elucidated\", \"Relevance to cervical cancer in vivo not confirmed\", \"Single-lab finding without independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the full-length structure of autoinhibited MARK1, the identity of its physiological membrane activating compartment, the specific substrates mediating its roles in Hippo signaling and neuronal polarity beyond MAPs, and the individual contributions of MARK1 versus other MARK paralogs in each biological context.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length crystal or cryo-EM structure of autoinhibited MARK1\", \"Paralog-specific knockout phenotypes in mammals not reported\", \"Direct substrates in Hippo–YAP axis unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 2, 3, 6]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 7]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"LKB1\", \"DAPK\", \"CagA\", \"tau\", \"MAP2\", \"MAP4\", \"Scribble\"],\n    \"other_free_text\": []\n  }\n}\n```"}