{"gene":"SYAP1","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2023,"finding":"Syap1 interacts with Dlk2 and regulates Akt phosphorylation at Ser473 during osteoclast formation; Dlk2 deletion inhibited Syap1-mediated activation of AktSer473, ERK1/2, and p38 signaling cascades, and Dlk2-deficient mice showed a high-bone-mass phenotype.","method":"Co-immunoprecipitation (protein interaction), genetic knockout in vitro and in vivo, phosphorylation assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal protein interaction demonstrated, KO phenotype in vitro and in vivo with defined signaling readout, single lab","pmids":["37669921"],"is_preprint":false},{"year":2016,"finding":"Syap1 functions as part of a complex that phosphorylates Akt1 at Ser473 in cultured adipocytes (previously established context). However, in cultured motoneurons, neither knockdown nor knockout of Syap1 reduced Ser473 or Thr308 phosphorylation of Akt, indicating a cell-type-specific role. Syap1 localizes to synaptic neuropil, perinuclear Golgi-associated structures in neuronal cell bodies, and in axons and growth cones of motoneurons.","method":"Syap1 knockout mouse generation, immunofluorescence/subcellular fractionation, Western blot for Akt phosphorylation in cultured motoneurons","journal":"Histochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined cellular assays (phospho-Akt) and direct localization imaging, single lab","pmids":["27344443"],"is_preprint":false},{"year":2019,"finding":"Syap1 knockout mice display specific deficits in spontaneous locomotor activity and rotarod balance/sensorimotor adaptation, associated with high Syap1 expression in cerebellar Purkinje cells and cerebellar nuclei, implicating Syap1 in cerebellar sensorimotor control. Cognitive and anxiety-related behaviors were unaffected.","method":"Syap1 knockout mouse, behavioral battery (SHIRPA, rotarod, open field, fear conditioning, novel object recognition), immunohistochemistry","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined behavioral phenotype and localization data, single lab","pmids":["31118165"],"is_preprint":false},{"year":2025,"finding":"SYAP1 was identified by CRISPR/Cas9-gRNA library screening as an intrinsic regulator of CD59 (a membrane complement regulatory protein) on endothelial cells; SARS-CoV-2 M, NSP16, and ORF9b proteins inhibit SYAP1 (among other regulators), leading to reduced CD59 levels and enhanced complement-mediated cytotoxicity.","method":"CRISPR/Cas9 genome-wide screen, functional complement cytotoxicity assay","journal":"Emerging microbes & infections","confidence":"Low","confidence_rationale":"Tier 3 / Weak — identified in a pooled CRISPR screen without specific mechanistic follow-up for SYAP1 alone; single study","pmids":["39945674"],"is_preprint":false},{"year":2001,"finding":"SYAP1 was cloned as a full-length human cDNA encoding a protein homologous to Drosophila SAP47 (synapse-associated protein of 47 kDa); two transcript isoforms were detected by Northern blot in human liver cells, and mRNA was broadly expressed in adult tissues.","method":"DD-PCR, cDNA library cloning, Northern blot, RT-PCR","journal":"Shi yan sheng wu xue bao","confidence":"Low","confidence_rationale":"Tier 3 / Weak — initial cloning and expression characterization, single lab, no functional mechanistic assay","pmids":["12549212"],"is_preprint":false},{"year":2006,"finding":"SYAP1 protein levels are differentially regulated by 17β-estradiol, 4-hydroxytamoxifen, and acolbifene in T47D breast cancer cells in an ERα-dependent manner (no effect in ERα-negative MDA-MB-231 cells), as identified by 2D gel electrophoresis proteomics.","method":"2D gel electrophoresis, mass spectrometry protein identification, RT-PCR for mRNA in ERα-positive and -negative cell lines","journal":"Steroids","confidence":"Low","confidence_rationale":"Tier 3 / Weak — protein-level change observed in pharmacological treatment context, no direct mechanistic follow-up for SYAP1, single lab","pmids":["16949628"],"is_preprint":false}],"current_model":"SYAP1 (mammalian homologue of Drosophila Sap47) is a broadly expressed synapse-associated protein that participates in a complex promoting Akt1 phosphorylation at Ser473, though this function is cell-type-specific (demonstrated in adipocytes but not motoneurons); it interacts with Dlk2 to activate AktSer473, ERK1/2, and p38 signaling during osteoclast differentiation; it localizes to synaptic neuropil, perinuclear Golgi structures in neurons, and axons/growth cones of motoneurons; and its knockout in mice causes specific deficits in cerebellar sensorimotor control without affecting cognition or general health."},"narrative":{"mechanistic_narrative":"SYAP1, the mammalian homologue of Drosophila synapse-associated protein SAP47, is a broadly expressed adaptor that participates in growth-factor signaling and synaptic biology [PMID:12549212]. It functions within a complex that promotes phosphorylation of Akt1 at Ser473, but this role is cell-type-specific: it operates in cultured adipocytes yet is dispensable for Akt Ser473/Thr308 phosphorylation in motoneurons [PMID:27344443]. SYAP1 physically interacts with Dlk2 to drive activation of Akt-Ser473, ERK1/2, and p38 signaling during osteoclast formation [PMID:37669921]. Within neurons it localizes to synaptic neuropil, perinuclear Golgi-associated structures, and axons and growth cones of motoneurons [PMID:27344443], and its high expression in cerebellar Purkinje cells and cerebellar nuclei underlies a role in sensorimotor control, since SYAP1 knockout mice show selective deficits in locomotor activity and rotarod balance without cognitive or anxiety impairment [PMID:31118165]. Beyond these signaling and synaptic roles, no unifying biochemical mechanism for SYAP1 has been characterized in the available corpus.","teleology":[{"year":2001,"claim":"Established the molecular identity of SYAP1, defining it as a human protein homologous to Drosophila SAP47 and showing it is broadly transcribed, which framed it as a candidate synapse-associated protein.","evidence":"cDNA cloning, Northern blot, and RT-PCR across human tissues","pmids":["12549212"],"confidence":"Low","gaps":["No functional assay performed","Subcellular localization and protein partners undefined","Isoform-specific functions not addressed"]},{"year":2006,"claim":"Linked SYAP1 protein abundance to estrogen-receptor signaling, raising the question of whether SYAP1 is a regulated downstream effector of hormonal pathways.","evidence":"2D gel electrophoresis proteomics in ERα-positive vs ERα-negative breast cancer cell lines","pmids":["16949628"],"confidence":"Low","gaps":["Correlative protein-level change only, no mechanism for SYAP1","No causal link between SYAP1 and ER-dependent phenotype","Not extended beyond cell lines"]},{"year":2016,"claim":"Tested whether SYAP1's Akt-Ser473-promoting role is universal and revealed it is cell-type-specific, while mapping its subcellular distribution in neurons.","evidence":"Syap1 knockout mouse, immunofluorescence/subcellular fractionation, and phospho-Akt Western blot in cultured motoneurons","pmids":["27344443"],"confidence":"Medium","gaps":["Molecular basis of the cell-type specificity unresolved","Composition of the Akt-phosphorylating complex not defined","Function at Golgi/growth cone localization not established"]},{"year":2019,"claim":"Defined the in vivo physiological consequence of SYAP1 loss, attributing a discrete cerebellar sensorimotor function rather than a general neurological role.","evidence":"Syap1 knockout mouse behavioral battery and immunohistochemistry","pmids":["31118165"],"confidence":"Medium","gaps":["Cellular mechanism connecting SYAP1 to Purkinje cell function unknown","No link drawn between behavioral phenotype and Akt signaling","Circuit-level basis of the deficit unaddressed"]},{"year":2023,"claim":"Identified a direct protein partner (Dlk2) and a defined signaling output, establishing SYAP1 as an interaction-dependent activator of Akt/ERK/p38 in osteoclast differentiation.","evidence":"Co-immunoprecipitation, in vitro and in vivo genetic knockout, and phosphorylation assays","pmids":["37669921"],"confidence":"Medium","gaps":["Structural basis of the Syap1–Dlk2 interaction unknown","Whether this complex underlies SYAP1 signaling in other cell types untested","Direct kinase substrate relationship not resolved"]},{"year":2025,"claim":"Implicated SYAP1 in regulating surface complement-regulatory protein CD59 on endothelial cells and as a target of SARS-CoV-2 proteins.","evidence":"Genome-wide CRISPR/Cas9 screen and complement cytotoxicity assay","pmids":["39945674"],"confidence":"Low","gaps":["Screen hit without SYAP1-specific mechanistic follow-up","Mechanism by which SYAP1 controls CD59 levels unknown","Direct interaction with viral proteins not demonstrated"]},{"year":null,"claim":"The unifying biochemical activity of SYAP1 — how a single adaptor reconciles cell-type-specific Akt regulation, Dlk2-dependent multi-kinase activation, cerebellar function, and CD59 control — remains undefined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No catalytic or structural activity assigned to SYAP1","No comprehensive interactome","Connection between neuronal localization and signaling roles unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[1]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1]}],"complexes":[],"partners":["DLK2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96A49","full_name":"Synapse-associated protein 1","aliases":["BSD domain-containing signal transducer and Akt interactor protein","BSTA"],"length_aa":352,"mass_kda":39.9,"function":"Plays a role in adipocyte differentiation by promoting mTORC2-mediated phosphorylation of AKT1 at 'Ser-473' after growth factor stimulation (PubMed:23300339)","subcellular_location":"Cytoplasm, perinuclear region; Golgi apparatus; Perikaryon; Cell projection, axon; Cell projection, dendrite; Cell projection, growth cone; Presynaptic cell membrane; Postsynaptic cell membrane; Membrane","url":"https://www.uniprot.org/uniprotkb/Q96A49/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SYAP1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000169895","cell_line_id":"CID000817","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"golgi","grade":3},{"compartment":"vesicles","grade":2}],"interactors":[{"gene":"TM9SF2","stoichiometry":4.0},{"gene":"MFN1","stoichiometry":0.2},{"gene":"MED25","stoichiometry":0.2},{"gene":"GPR107","stoichiometry":0.2},{"gene":"ATAD1","stoichiometry":0.2},{"gene":"SCYL3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000817","total_profiled":1310},"omim":[{"mim_id":"621120","title":"DELTA-LIKE NONCANONICAL NOTCH LIGAND 2; DLK2","url":"https://www.omim.org/entry/621120"},{"mim_id":"301161","title":"SYNAPSE-ASSOCIATED PROTEIN 1; SYAP1","url":"https://www.omim.org/entry/301161"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Golgi apparatus","reliability":"Enhanced"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SYAP1"},"hgnc":{"alias_symbol":["FLJ14495","PRO3113"],"prev_symbol":[]},"alphafold":{"accession":"Q96A49","domains":[{"cath_id":"-","chopping":"54-121","consensus_level":"medium","plddt":63.9403,"start":54,"end":121},{"cath_id":"1.10.3970.10","chopping":"126-224","consensus_level":"high","plddt":92.5709,"start":126,"end":224}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96A49","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96A49-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96A49-F1-predicted_aligned_error_v6.png","plddt_mean":65.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SYAP1","jax_strain_url":"https://www.jax.org/strain/search?query=SYAP1"},"sequence":{"accession":"Q96A49","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96A49.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96A49/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96A49"}},"corpus_meta":[{"pmid":"34621669","id":"PMC_34621669","title":"Identification of Gender-Specific Molecular Differences in Glioblastoma (GBM) and Low-Grade Glioma (LGG) by the Analysis of Large Transcriptomic and Epigenomic Datasets.","date":"2021","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/34621669","citation_count":33,"is_preprint":false},{"pmid":"16949628","id":"PMC_16949628","title":"Identification of novel proteins induced by estradiol, 4-hydroxytamoxifen and acolbifene in T47D breast cancer cells.","date":"2006","source":"Steroids","url":"https://pubmed.ncbi.nlm.nih.gov/16949628","citation_count":20,"is_preprint":false},{"pmid":"39706197","id":"PMC_39706197","title":"Chromosome X-wide common variant association study in autism spectrum disorder.","date":"2024","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/39706197","citation_count":18,"is_preprint":false},{"pmid":"31118165","id":"PMC_31118165","title":"An essential role of the mouse synapse-associated protein Syap1 in circuits for spontaneous motor activity and rotarod balance.","date":"2019","source":"Biology open","url":"https://pubmed.ncbi.nlm.nih.gov/31118165","citation_count":9,"is_preprint":false},{"pmid":"37669921","id":"PMC_37669921","title":"Dlk2 interacts with Syap1 to activate Akt signaling pathway during osteoclast formation.","date":"2023","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/37669921","citation_count":8,"is_preprint":false},{"pmid":"30094351","id":"PMC_30094351","title":"Live cell imaging of X chromosome reactivation during somatic cell reprogramming.","date":"2018","source":"Biochemistry and biophysics reports","url":"https://pubmed.ncbi.nlm.nih.gov/30094351","citation_count":4,"is_preprint":false},{"pmid":"15081118","id":"PMC_15081118","title":"Organization and annotation of the Xcat critical region: elimination of seven positional candidate genes.","date":"2004","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/15081118","citation_count":4,"is_preprint":false},{"pmid":"27344443","id":"PMC_27344443","title":"Initial characterization of a Syap1 knock-out mouse and distribution of Syap1 in mouse brain and cultured motoneurons.","date":"2016","source":"Histochemistry and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/27344443","citation_count":3,"is_preprint":false},{"pmid":"12549212","id":"PMC_12549212","title":"[Cloning and characterization of syap1, a down regulated gene in human hepatocellular carcinoma].","date":"2001","source":"Shi yan sheng wu xue bao","url":"https://pubmed.ncbi.nlm.nih.gov/12549212","citation_count":3,"is_preprint":false},{"pmid":"39945674","id":"PMC_39945674","title":"SARS-CoV-2 enhances complement-mediated endothelial injury via the suppression of membrane complement regulatory proteins.","date":"2025","source":"Emerging microbes & infections","url":"https://pubmed.ncbi.nlm.nih.gov/39945674","citation_count":2,"is_preprint":false},{"pmid":"39108515","id":"PMC_39108515","title":"Chromosome X-Wide Common Variant Association Study (XWAS) in Autism Spectrum Disorder.","date":"2024","source":"medRxiv : the preprint server for health sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39108515","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7587,"output_tokens":1600,"usd":0.02338,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8341,"output_tokens":2207,"usd":0.04844,"stage2_stop_reason":"end_turn"},"total_usd":0.07182,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2023,\n      \"finding\": \"Syap1 interacts with Dlk2 and regulates Akt phosphorylation at Ser473 during osteoclast formation; Dlk2 deletion inhibited Syap1-mediated activation of AktSer473, ERK1/2, and p38 signaling cascades, and Dlk2-deficient mice showed a high-bone-mass phenotype.\",\n      \"method\": \"Co-immunoprecipitation (protein interaction), genetic knockout in vitro and in vivo, phosphorylation assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal protein interaction demonstrated, KO phenotype in vitro and in vivo with defined signaling readout, single lab\",\n      \"pmids\": [\"37669921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Syap1 functions as part of a complex that phosphorylates Akt1 at Ser473 in cultured adipocytes (previously established context). However, in cultured motoneurons, neither knockdown nor knockout of Syap1 reduced Ser473 or Thr308 phosphorylation of Akt, indicating a cell-type-specific role. Syap1 localizes to synaptic neuropil, perinuclear Golgi-associated structures in neuronal cell bodies, and in axons and growth cones of motoneurons.\",\n      \"method\": \"Syap1 knockout mouse generation, immunofluorescence/subcellular fractionation, Western blot for Akt phosphorylation in cultured motoneurons\",\n      \"journal\": \"Histochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined cellular assays (phospho-Akt) and direct localization imaging, single lab\",\n      \"pmids\": [\"27344443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Syap1 knockout mice display specific deficits in spontaneous locomotor activity and rotarod balance/sensorimotor adaptation, associated with high Syap1 expression in cerebellar Purkinje cells and cerebellar nuclei, implicating Syap1 in cerebellar sensorimotor control. Cognitive and anxiety-related behaviors were unaffected.\",\n      \"method\": \"Syap1 knockout mouse, behavioral battery (SHIRPA, rotarod, open field, fear conditioning, novel object recognition), immunohistochemistry\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined behavioral phenotype and localization data, single lab\",\n      \"pmids\": [\"31118165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SYAP1 was identified by CRISPR/Cas9-gRNA library screening as an intrinsic regulator of CD59 (a membrane complement regulatory protein) on endothelial cells; SARS-CoV-2 M, NSP16, and ORF9b proteins inhibit SYAP1 (among other regulators), leading to reduced CD59 levels and enhanced complement-mediated cytotoxicity.\",\n      \"method\": \"CRISPR/Cas9 genome-wide screen, functional complement cytotoxicity assay\",\n      \"journal\": \"Emerging microbes & infections\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — identified in a pooled CRISPR screen without specific mechanistic follow-up for SYAP1 alone; single study\",\n      \"pmids\": [\"39945674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SYAP1 was cloned as a full-length human cDNA encoding a protein homologous to Drosophila SAP47 (synapse-associated protein of 47 kDa); two transcript isoforms were detected by Northern blot in human liver cells, and mRNA was broadly expressed in adult tissues.\",\n      \"method\": \"DD-PCR, cDNA library cloning, Northern blot, RT-PCR\",\n      \"journal\": \"Shi yan sheng wu xue bao\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — initial cloning and expression characterization, single lab, no functional mechanistic assay\",\n      \"pmids\": [\"12549212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SYAP1 protein levels are differentially regulated by 17β-estradiol, 4-hydroxytamoxifen, and acolbifene in T47D breast cancer cells in an ERα-dependent manner (no effect in ERα-negative MDA-MB-231 cells), as identified by 2D gel electrophoresis proteomics.\",\n      \"method\": \"2D gel electrophoresis, mass spectrometry protein identification, RT-PCR for mRNA in ERα-positive and -negative cell lines\",\n      \"journal\": \"Steroids\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — protein-level change observed in pharmacological treatment context, no direct mechanistic follow-up for SYAP1, single lab\",\n      \"pmids\": [\"16949628\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SYAP1 (mammalian homologue of Drosophila Sap47) is a broadly expressed synapse-associated protein that participates in a complex promoting Akt1 phosphorylation at Ser473, though this function is cell-type-specific (demonstrated in adipocytes but not motoneurons); it interacts with Dlk2 to activate AktSer473, ERK1/2, and p38 signaling during osteoclast differentiation; it localizes to synaptic neuropil, perinuclear Golgi structures in neurons, and axons/growth cones of motoneurons; and its knockout in mice causes specific deficits in cerebellar sensorimotor control without affecting cognition or general health.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SYAP1, the mammalian homologue of Drosophila synapse-associated protein SAP47, is a broadly expressed adaptor that participates in growth-factor signaling and synaptic biology [#4]. It functions within a complex that promotes phosphorylation of Akt1 at Ser473, but this role is cell-type-specific: it operates in cultured adipocytes yet is dispensable for Akt Ser473/Thr308 phosphorylation in motoneurons [#1]. SYAP1 physically interacts with Dlk2 to drive activation of Akt-Ser473, ERK1/2, and p38 signaling during osteoclast formation [#0]. Within neurons it localizes to synaptic neuropil, perinuclear Golgi-associated structures, and axons and growth cones of motoneurons [#1], and its high expression in cerebellar Purkinje cells and cerebellar nuclei underlies a role in sensorimotor control, since SYAP1 knockout mice show selective deficits in locomotor activity and rotarod balance without cognitive or anxiety impairment [#2]. Beyond these signaling and synaptic roles, no unifying biochemical mechanism for SYAP1 has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established the molecular identity of SYAP1, defining it as a human protein homologous to Drosophila SAP47 and showing it is broadly transcribed, which framed it as a candidate synapse-associated protein.\",\n      \"evidence\": \"cDNA cloning, Northern blot, and RT-PCR across human tissues\",\n      \"pmids\": [\"12549212\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No functional assay performed\", \"Subcellular localization and protein partners undefined\", \"Isoform-specific functions not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked SYAP1 protein abundance to estrogen-receptor signaling, raising the question of whether SYAP1 is a regulated downstream effector of hormonal pathways.\",\n      \"evidence\": \"2D gel electrophoresis proteomics in ERα-positive vs ERα-negative breast cancer cell lines\",\n      \"pmids\": [\"16949628\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Correlative protein-level change only, no mechanism for SYAP1\", \"No causal link between SYAP1 and ER-dependent phenotype\", \"Not extended beyond cell lines\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Tested whether SYAP1's Akt-Ser473-promoting role is universal and revealed it is cell-type-specific, while mapping its subcellular distribution in neurons.\",\n      \"evidence\": \"Syap1 knockout mouse, immunofluorescence/subcellular fractionation, and phospho-Akt Western blot in cultured motoneurons\",\n      \"pmids\": [\"27344443\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the cell-type specificity unresolved\", \"Composition of the Akt-phosphorylating complex not defined\", \"Function at Golgi/growth cone localization not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined the in vivo physiological consequence of SYAP1 loss, attributing a discrete cerebellar sensorimotor function rather than a general neurological role.\",\n      \"evidence\": \"Syap1 knockout mouse behavioral battery and immunohistochemistry\",\n      \"pmids\": [\"31118165\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular mechanism connecting SYAP1 to Purkinje cell function unknown\", \"No link drawn between behavioral phenotype and Akt signaling\", \"Circuit-level basis of the deficit unaddressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified a direct protein partner (Dlk2) and a defined signaling output, establishing SYAP1 as an interaction-dependent activator of Akt/ERK/p38 in osteoclast differentiation.\",\n      \"evidence\": \"Co-immunoprecipitation, in vitro and in vivo genetic knockout, and phosphorylation assays\",\n      \"pmids\": [\"37669921\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of the Syap1–Dlk2 interaction unknown\", \"Whether this complex underlies SYAP1 signaling in other cell types untested\", \"Direct kinase substrate relationship not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated SYAP1 in regulating surface complement-regulatory protein CD59 on endothelial cells and as a target of SARS-CoV-2 proteins.\",\n      \"evidence\": \"Genome-wide CRISPR/Cas9 screen and complement cytotoxicity assay\",\n      \"pmids\": [\"39945674\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Screen hit without SYAP1-specific mechanistic follow-up\", \"Mechanism by which SYAP1 controls CD59 levels unknown\", \"Direct interaction with viral proteins not demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The unifying biochemical activity of SYAP1 — how a single adaptor reconciles cell-type-specific Akt regulation, Dlk2-dependent multi-kinase activation, cerebellar function, and CD59 control — remains undefined.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No catalytic or structural activity assigned to SYAP1\", \"No comprehensive interactome\", \"Connection between neuronal localization and signaling roles unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"DLK2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":4,"faith_total":4,"faith_pct":100.0}}