{"gene":"ALOX5AP","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":2003,"finding":"FLAP (5-lipoxygenase-activating protein) acts as a helper/scaffolding protein required for efficient utilization of endogenous arachidonic acid substrate by 5-lipoxygenase (5-LO) in intact cells, enabling leukotriene biosynthesis. Without FLAP, 5-LO can still process exogenous arachidonic acid but not endogenous substrate.","method":"Review synthesizing knockdown/inhibitor studies and biochemical reconstitution; knockdown experiments showing FLAP is dispensable with exogenous AA but required for endogenous substrate","journal":"Prostaglandins, leukotrienes, and essential fatty acids","confidence":"High","confidence_rationale":"Tier 2 / Strong — concept replicated across multiple labs over a decade, knockdown and inhibitor studies with defined biochemical readouts","pmids":["12895592"],"is_preprint":false},{"year":2014,"finding":"FLAP acts as a scaffolding protein at the nuclear envelope for assembly of enzymes in the leukotriene synthetic pathway. FLAP knockdown in human monocytic MM6 cells led to prominent reductions in 5-LO product formation from endogenous substrate but only minor effects with exogenous arachidonic acid; FLAP knockdown also reduced conversion of LTA4 to LTC4, suggesting a role in stabilizing LTC4 synthase activity. FLAP-deficient cells showed compromised perinuclear redistribution of 5-LO upon stimulation. Co-immunoprecipitation confirmed that 5LO-CLP complex formation was unaffected by FLAP knockdown.","method":"siRNA knockdown in Mono Mac 6 cells and primary macrophages; co-immunoprecipitation; immunofluorescence for subcellular localization; product formation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, siRNA knockdown with defined biochemical phenotypes, localization studies, replicated in primary macrophages","pmids":["25034252"],"is_preprint":false},{"year":2009,"finding":"FLAP acts as a scaffolding protein for the assembly of other enzymes involved in the leukotriene synthetic pathway occurring at the nuclear envelope of leukocytes, enabling both LTB4 and cysteinyl leukotriene production. FLAP inhibitors (MK-886, MK-0591, BAY-X-1005) block this assembly and prevent leukotriene synthesis.","method":"Pharmacological inhibition studies and review of biochemical pathway reconstitution","journal":"Current opinion in investigational drugs (London, England : 2000)","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single review synthesizing inhibitor data; mechanism consistent with knockdown studies but this paper alone is a review","pmids":["19876784"],"is_preprint":false},{"year":1991,"finding":"The human FLAP gene spans >31 kilobases, consists of five exons and four introns, is present as a single copy per haploid genome, and its promoter contains a TATA box, AP-2 and glucocorticoid receptor binding sites. Functional promoter analysis by transient transfection showed tissue-specific expression (active in macrophage P388D1 cells, minimal in hepatoma HepG2 cells) and enhancer-like activities in the macrophage cell line.","method":"Gene cloning, Southern blot, transient transfection with CAT reporter gene, transcription initiation site mapping","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional promoter assays by transient transfection, multiple constructs tested, tissue specificity confirmed","pmids":["1673682"],"is_preprint":false},{"year":1999,"finding":"MK886 (a FLAP inhibitor) induces apoptosis independently of FLAP. WSU cells lacking FLAP protein and mRNA still undergo apoptosis upon MK886 treatment; antisense-mediated reduction of FLAP expression by >50% in FL5.12 cells does not increase apoptosis and does not alter MK886-induced apoptosis, demonstrating that MK886's apoptotic effect is FLAP-independent.","method":"Apoptosis assays in FLAP-null cell line; antisense oligonucleotide knockdown of FLAP; cell viability assays; oxidative stress measurement by carboxydichlorofluorescein fluorescence","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FLAP-null cell line plus antisense knockdown, two orthogonal approaches both yielding negative result for FLAP in MK886 apoptosis","pmids":["10333477"],"is_preprint":false},{"year":1997,"finding":"Dexamethasone differentially regulates FLAP and COX-2 in monocytic THP-1 cells: while glucocorticoid treatment downregulates COX-2 mRNA and protein, it upregulates FLAP mRNA and protein (>2-fold after 24h) in differentiated monocyte-like cells. This provides a mechanism to maintain leukotriene biosynthesis through more efficient arachidonic acid transfer to 5-LO, despite glucocorticoid-mediated inhibition of other biosynthetic pathway enzymes.","method":"Northern blot and Western blot analyses of mRNA and protein levels in THP-1 cells; ELISA for prostaglandin E2 and peptidoleukotriene release","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Northern and Western blot with functional leukotriene release assays, single lab but multiple orthogonal methods","pmids":["9375956"],"is_preprint":false},{"year":2016,"finding":"Transgenic overexpression of ALOX5AP in adipose tissue leads to elevated LXA4 (lipoxin A4) rather than elevated LTB4 production, resulting in protection against diet-induced obesity, increased energy expenditure, browning of white adipose tissue, and upregulation of hepatic LXR/Cyp7a1 pathway. Treatment of wild-type mice with LXA4 recapitulated the browning phenotype, identifying LXA4 as the responsible mediator.","method":"Transgenic mouse overexpression of ALOX5AP in adipose tissue; lipid mediator quantification; LXA4 administration in wild-type mice; metabolic phenotyping","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic overexpression with pharmacological rescue (LXA4 treatment), single lab with multiple orthogonal readouts","pmids":["27207555"],"is_preprint":false},{"year":2018,"finding":"miR-146a directly targets the FLAP 3'-UTR to repress FLAP expression post-transcriptionally in lung cancer cells, reducing LTB4 production. Reporter assays confirmed direct interaction between miR-146a and the FLAP 3'-UTR. miR-146a promoter is hypermethylated in lung cancer cell lines.","method":"Transient and stable transfections of miR-146a; 3'-UTR luciferase reporter assays; LTB4 ELISA; methylation analysis","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR reporter assay plus functional LTB4 output measurement, single lab","pmids":["29928483"],"is_preprint":false},{"year":2022,"finding":"miR-146a-5p directly targets FLAP mRNA (confirmed by dual luciferase reporter assay), suppressing FLAP protein expression in HepG2 hepatocellular carcinoma cells; knockdown of miR-146a increases FLAP expression. Restoration of FLAP by miR-146a silencing led to reduced HepG2 cell proliferation, cell cycle progression, migration, and invasion.","method":"Dual luciferase reporter assay; miR-146a knockdown/overexpression in HepG2 cells; cell proliferation, migration, and invasion assays","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR reporter assay plus functional cellular assays, single lab","pmids":["35410355"],"is_preprint":false}],"current_model":"FLAP (ALOX5AP) functions as a membrane-anchored scaffolding protein at the nuclear envelope of leukocytes that is essential for efficient transfer of endogenous arachidonic acid to 5-lipoxygenase, thereby enabling cellular leukotriene biosynthesis; it also stabilizes the perinuclear translocation of the 5-LO–coactosin-like protein complex upon cell stimulation, facilitates downstream LTC4 synthase activity, and is transcriptionally regulated by glucocorticoids and post-transcriptionally repressed by miR-146a."},"narrative":{"mechanistic_narrative":"ALOX5AP (FLAP) is a membrane-anchored scaffolding protein at the nuclear envelope of leukocytes that is essential for cellular leukotriene biosynthesis [PMID:12895592, PMID:25034252, PMID:19876784]. It enables efficient transfer of endogenous arachidonic acid to 5-lipoxygenase: FLAP is dispensable when exogenous arachidonic acid is supplied but required for processing of endogenous substrate, so its loss sharply reduces 5-LO product formation [PMID:12895592, PMID:25034252]. FLAP organizes assembly of the leukotriene synthetic machinery at the nuclear envelope, supporting the perinuclear redistribution of 5-LO upon stimulation and stabilizing downstream conversion of LTA4 to LTC4, thereby enabling both LTB4 and cysteinyl leukotriene production [PMID:25034252, PMID:19876784]. Its catalytic output is not fixed: adipose overexpression in mice shifts the lipid mediator profile toward lipoxin A4 rather than LTB4, conferring protection against diet-induced obesity and browning of white adipose tissue [PMID:27207555]. FLAP expression is transcriptionally controlled — its promoter carries a glucocorticoid receptor element and is upregulated by dexamethasone in monocytic cells [PMID:1673682, PMID:9375956] — and post-transcriptionally repressed by miR-146a binding to its 3'-UTR, a circuit operative in lung and hepatocellular carcinoma cells [PMID:29928483, PMID:35410355].","teleology":[{"year":1991,"claim":"Establishing the genomic and transcriptional architecture of FLAP defined how its expression is controlled and revealed its tissue-restricted, macrophage-biased expression.","evidence":"Gene cloning, Southern blot, and transient CAT reporter promoter analysis in macrophage versus hepatoma lines","pmids":["1673682"],"confidence":"Medium","gaps":["Transcription factors driving macrophage-specific enhancer activity not identified","Glucocorticoid response element identified by sequence but not functionally validated in this study"]},{"year":1997,"claim":"Showing glucocorticoids upregulate FLAP while downregulating COX-2 answered how leukotriene biosynthesis is maintained under glucocorticoid suppression of other eicosanoid enzymes.","evidence":"Northern/Western blot and leukotriene release ELISA in dexamethasone-treated THP-1 monocytic cells","pmids":["9375956"],"confidence":"Medium","gaps":["Direct GR occupancy at the FLAP promoter not demonstrated","Single cell line"]},{"year":1999,"claim":"Determining whether the FLAP inhibitor MK886 acts through FLAP clarified that its apoptotic effect is FLAP-independent, separating pharmacological off-target activity from FLAP's true function.","evidence":"Apoptosis and viability assays in a FLAP-null cell line plus antisense knockdown","pmids":["10333477"],"confidence":"Medium","gaps":["Does not define the actual target mediating MK886-induced apoptosis","Negative result limited to the cell lines tested"]},{"year":2003,"claim":"Synthesis of knockdown and reconstitution data established FLAP as a helper protein required specifically for utilization of endogenous arachidonic acid by 5-LO.","evidence":"Review integrating knockdown and inhibitor studies with biochemical readouts","pmids":["12895592"],"confidence":"High","gaps":["Structural basis of arachidonic acid transfer not resolved","Stoichiometry of FLAP-5-LO interaction not defined"]},{"year":2009,"claim":"Framing FLAP as a nuclear-envelope scaffold for the leukotriene pathway connected its substrate-transfer role to assembly of the full biosynthetic machinery producing both LTB4 and cysteinyl leukotrienes.","evidence":"Pharmacological inhibition studies and review of pathway reconstitution","pmids":["19876784"],"confidence":"Medium","gaps":["Review-level synthesis; no new primary assembly data","Direct binding partners within the assembled complex not mapped"]},{"year":2014,"claim":"Direct knockdown experiments resolved which steps of leukotriene synthesis depend on FLAP, showing it controls perinuclear 5-LO redistribution and stabilizes LTC4 synthase activity without altering 5LO-CLP complex formation.","evidence":"siRNA knockdown in Mono Mac 6 cells and primary macrophages with co-IP, immunofluorescence, and product assays","pmids":["25034252"],"confidence":"High","gaps":["Molecular mechanism by which FLAP stabilizes LTC4 synthase not defined","Direct physical contact between FLAP and LTC4 synthase not shown"]},{"year":2016,"claim":"Adipose-specific overexpression revealed that FLAP can redirect output toward lipoxin A4 rather than LTB4, linking it to metabolic regulation and adipose browning.","evidence":"Transgenic mouse overexpression with lipid mediator quantification and LXA4 rescue","pmids":["27207555"],"confidence":"Medium","gaps":["Mechanism dictating LXA4 versus LTB4 output in adipose tissue unexplained","Single lab; relevance to endogenous FLAP levels unclear"]},{"year":2022,"claim":"Identifying miR-146a as a direct repressor of FLAP defined a post-transcriptional control circuit and linked FLAP levels to tumor cell behavior in lung and hepatocellular carcinoma.","evidence":"Dual luciferase 3'-UTR reporter assays plus miR-146a gain/loss and proliferation/migration/invasion assays in HepG2 and lung cancer cells","pmids":["29928483","35410355"],"confidence":"Medium","gaps":["Whether FLAP's pro-tumor effects depend on leukotriene output not established","Single-lab functional assays per cancer type"]},{"year":null,"claim":"How FLAP physically presents arachidonic acid to 5-LO and what determines whether the pathway yields pro-inflammatory leukotrienes versus pro-resolving lipoxins remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the FLAP-5-LO substrate-transfer interface in the corpus","Switch governing LTB4 vs LXA4 output uncharacterized at the molecular level"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,1]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,2]}],"localization":[{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,6]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2]}],"complexes":[],"partners":["ALOX5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P20292","full_name":"Arachidonate 5-lipoxygenase-activating protein","aliases":["FLAP","MK-886-binding protein"],"length_aa":161,"mass_kda":18.2,"function":"Required for leukotriene biosynthesis by ALOX5 (5-lipoxygenase). Anchors ALOX5 to the membrane. Binds arachidonic acid, and could play an essential role in the transfer of arachidonic acid to ALOX5. Binds to MK-886, a compound that blocks the biosynthesis of leukotrienes","subcellular_location":"Nucleus membrane; Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/P20292/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ALOX5AP","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ALOX5AP","total_profiled":1310},"omim":[{"mim_id":"608557","title":"MYOCARDIAL INFARCTION, SUSCEPTIBILITY TO, 2","url":"https://www.omim.org/entry/608557"},{"mim_id":"605172","title":"PROSTAGLANDIN E SYNTHASE; PTGES","url":"https://www.omim.org/entry/605172"},{"mim_id":"603700","title":"ARACHIDONATE 5-LIPOXYGENASE-ACTIVATING PROTEIN; ALOX5AP","url":"https://www.omim.org/entry/603700"},{"mim_id":"601367","title":"STROKE, ISCHEMIC","url":"https://www.omim.org/entry/601367"},{"mim_id":"152390","title":"ARACHIDONATE 5-LIPOXYGENASE; ALOX5","url":"https://www.omim.org/entry/152390"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":460.3},{"tissue":"lung","ntpm":172.6},{"tissue":"lymphoid tissue","ntpm":141.7}],"url":"https://www.proteinatlas.org/search/ALOX5AP"},"hgnc":{"alias_symbol":["FLAP"],"prev_symbol":[]},"alphafold":{"accession":"P20292","domains":[{"cath_id":"1.20.120.550","chopping":"2-37_46-157","consensus_level":"high","plddt":92.2176,"start":2,"end":157}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P20292","model_url":"https://alphafold.ebi.ac.uk/files/AF-P20292-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P20292-F1-predicted_aligned_error_v6.png","plddt_mean":89.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ALOX5AP","jax_strain_url":"https://www.jax.org/strain/search?query=ALOX5AP"},"sequence":{"accession":"P20292","fasta_url":"https://rest.uniprot.org/uniprotkb/P20292.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P20292/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P20292"}},"corpus_meta":[{"pmid":"15189154","id":"PMC_15189154","title":"Flap endonuclease 1: a 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standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"FLAP (5-lipoxygenase-activating protein) acts as a helper/scaffolding protein required for efficient utilization of endogenous arachidonic acid substrate by 5-lipoxygenase (5-LO) in intact cells, enabling leukotriene biosynthesis. Without FLAP, 5-LO can still process exogenous arachidonic acid but not endogenous substrate.\",\n      \"method\": \"Review synthesizing knockdown/inhibitor studies and biochemical reconstitution; knockdown experiments showing FLAP is dispensable with exogenous AA but required for endogenous substrate\",\n      \"journal\": \"Prostaglandins, leukotrienes, and essential fatty acids\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — concept replicated across multiple labs over a decade, knockdown and inhibitor studies with defined biochemical readouts\",\n      \"pmids\": [\"12895592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"FLAP acts as a scaffolding protein at the nuclear envelope for assembly of enzymes in the leukotriene synthetic pathway. FLAP knockdown in human monocytic MM6 cells led to prominent reductions in 5-LO product formation from endogenous substrate but only minor effects with exogenous arachidonic acid; FLAP knockdown also reduced conversion of LTA4 to LTC4, suggesting a role in stabilizing LTC4 synthase activity. FLAP-deficient cells showed compromised perinuclear redistribution of 5-LO upon stimulation. Co-immunoprecipitation confirmed that 5LO-CLP complex formation was unaffected by FLAP knockdown.\",\n      \"method\": \"siRNA knockdown in Mono Mac 6 cells and primary macrophages; co-immunoprecipitation; immunofluorescence for subcellular localization; product formation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, siRNA knockdown with defined biochemical phenotypes, localization studies, replicated in primary macrophages\",\n      \"pmids\": [\"25034252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FLAP acts as a scaffolding protein for the assembly of other enzymes involved in the leukotriene synthetic pathway occurring at the nuclear envelope of leukocytes, enabling both LTB4 and cysteinyl leukotriene production. FLAP inhibitors (MK-886, MK-0591, BAY-X-1005) block this assembly and prevent leukotriene synthesis.\",\n      \"method\": \"Pharmacological inhibition studies and review of biochemical pathway reconstitution\",\n      \"journal\": \"Current opinion in investigational drugs (London, England : 2000)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single review synthesizing inhibitor data; mechanism consistent with knockdown studies but this paper alone is a review\",\n      \"pmids\": [\"19876784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The human FLAP gene spans >31 kilobases, consists of five exons and four introns, is present as a single copy per haploid genome, and its promoter contains a TATA box, AP-2 and glucocorticoid receptor binding sites. Functional promoter analysis by transient transfection showed tissue-specific expression (active in macrophage P388D1 cells, minimal in hepatoma HepG2 cells) and enhancer-like activities in the macrophage cell line.\",\n      \"method\": \"Gene cloning, Southern blot, transient transfection with CAT reporter gene, transcription initiation site mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional promoter assays by transient transfection, multiple constructs tested, tissue specificity confirmed\",\n      \"pmids\": [\"1673682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"MK886 (a FLAP inhibitor) induces apoptosis independently of FLAP. WSU cells lacking FLAP protein and mRNA still undergo apoptosis upon MK886 treatment; antisense-mediated reduction of FLAP expression by >50% in FL5.12 cells does not increase apoptosis and does not alter MK886-induced apoptosis, demonstrating that MK886's apoptotic effect is FLAP-independent.\",\n      \"method\": \"Apoptosis assays in FLAP-null cell line; antisense oligonucleotide knockdown of FLAP; cell viability assays; oxidative stress measurement by carboxydichlorofluorescein fluorescence\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FLAP-null cell line plus antisense knockdown, two orthogonal approaches both yielding negative result for FLAP in MK886 apoptosis\",\n      \"pmids\": [\"10333477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Dexamethasone differentially regulates FLAP and COX-2 in monocytic THP-1 cells: while glucocorticoid treatment downregulates COX-2 mRNA and protein, it upregulates FLAP mRNA and protein (>2-fold after 24h) in differentiated monocyte-like cells. This provides a mechanism to maintain leukotriene biosynthesis through more efficient arachidonic acid transfer to 5-LO, despite glucocorticoid-mediated inhibition of other biosynthetic pathway enzymes.\",\n      \"method\": \"Northern blot and Western blot analyses of mRNA and protein levels in THP-1 cells; ELISA for prostaglandin E2 and peptidoleukotriene release\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Northern and Western blot with functional leukotriene release assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"9375956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Transgenic overexpression of ALOX5AP in adipose tissue leads to elevated LXA4 (lipoxin A4) rather than elevated LTB4 production, resulting in protection against diet-induced obesity, increased energy expenditure, browning of white adipose tissue, and upregulation of hepatic LXR/Cyp7a1 pathway. Treatment of wild-type mice with LXA4 recapitulated the browning phenotype, identifying LXA4 as the responsible mediator.\",\n      \"method\": \"Transgenic mouse overexpression of ALOX5AP in adipose tissue; lipid mediator quantification; LXA4 administration in wild-type mice; metabolic phenotyping\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic overexpression with pharmacological rescue (LXA4 treatment), single lab with multiple orthogonal readouts\",\n      \"pmids\": [\"27207555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"miR-146a directly targets the FLAP 3'-UTR to repress FLAP expression post-transcriptionally in lung cancer cells, reducing LTB4 production. Reporter assays confirmed direct interaction between miR-146a and the FLAP 3'-UTR. miR-146a promoter is hypermethylated in lung cancer cell lines.\",\n      \"method\": \"Transient and stable transfections of miR-146a; 3'-UTR luciferase reporter assays; LTB4 ELISA; methylation analysis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR reporter assay plus functional LTB4 output measurement, single lab\",\n      \"pmids\": [\"29928483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-146a-5p directly targets FLAP mRNA (confirmed by dual luciferase reporter assay), suppressing FLAP protein expression in HepG2 hepatocellular carcinoma cells; knockdown of miR-146a increases FLAP expression. Restoration of FLAP by miR-146a silencing led to reduced HepG2 cell proliferation, cell cycle progression, migration, and invasion.\",\n      \"method\": \"Dual luciferase reporter assay; miR-146a knockdown/overexpression in HepG2 cells; cell proliferation, migration, and invasion assays\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR reporter assay plus functional cellular assays, single lab\",\n      \"pmids\": [\"35410355\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FLAP (ALOX5AP) functions as a membrane-anchored scaffolding protein at the nuclear envelope of leukocytes that is essential for efficient transfer of endogenous arachidonic acid to 5-lipoxygenase, thereby enabling cellular leukotriene biosynthesis; it also stabilizes the perinuclear translocation of the 5-LO–coactosin-like protein complex upon cell stimulation, facilitates downstream LTC4 synthase activity, and is transcriptionally regulated by glucocorticoids and post-transcriptionally repressed by miR-146a.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ALOX5AP (FLAP) is a membrane-anchored scaffolding protein at the nuclear envelope of leukocytes that is essential for cellular leukotriene biosynthesis [#0, #1, #2]. It enables efficient transfer of endogenous arachidonic acid to 5-lipoxygenase: FLAP is dispensable when exogenous arachidonic acid is supplied but required for processing of endogenous substrate, so its loss sharply reduces 5-LO product formation [#0, #1]. FLAP organizes assembly of the leukotriene synthetic machinery at the nuclear envelope, supporting the perinuclear redistribution of 5-LO upon stimulation and stabilizing downstream conversion of LTA4 to LTC4, thereby enabling both LTB4 and cysteinyl leukotriene production [#1, #2]. Its catalytic output is not fixed: adipose overexpression in mice shifts the lipid mediator profile toward lipoxin A4 rather than LTB4, conferring protection against diet-induced obesity and browning of white adipose tissue [#6]. FLAP expression is transcriptionally controlled — its promoter carries a glucocorticoid receptor element and is upregulated by dexamethasone in monocytic cells [#3, #5] — and post-transcriptionally repressed by miR-146a binding to its 3'-UTR, a circuit operative in lung and hepatocellular carcinoma cells [#7, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Establishing the genomic and transcriptional architecture of FLAP defined how its expression is controlled and revealed its tissue-restricted, macrophage-biased expression.\",\n      \"evidence\": \"Gene cloning, Southern blot, and transient CAT reporter promoter analysis in macrophage versus hepatoma lines\",\n      \"pmids\": [\"1673682\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcription factors driving macrophage-specific enhancer activity not identified\", \"Glucocorticoid response element identified by sequence but not functionally validated in this study\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Showing glucocorticoids upregulate FLAP while downregulating COX-2 answered how leukotriene biosynthesis is maintained under glucocorticoid suppression of other eicosanoid enzymes.\",\n      \"evidence\": \"Northern/Western blot and leukotriene release ELISA in dexamethasone-treated THP-1 monocytic cells\",\n      \"pmids\": [\"9375956\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GR occupancy at the FLAP promoter not demonstrated\", \"Single cell line\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Determining whether the FLAP inhibitor MK886 acts through FLAP clarified that its apoptotic effect is FLAP-independent, separating pharmacological off-target activity from FLAP's true function.\",\n      \"evidence\": \"Apoptosis and viability assays in a FLAP-null cell line plus antisense knockdown\",\n      \"pmids\": [\"10333477\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not define the actual target mediating MK886-induced apoptosis\", \"Negative result limited to the cell lines tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Synthesis of knockdown and reconstitution data established FLAP as a helper protein required specifically for utilization of endogenous arachidonic acid by 5-LO.\",\n      \"evidence\": \"Review integrating knockdown and inhibitor studies with biochemical readouts\",\n      \"pmids\": [\"12895592\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of arachidonic acid transfer not resolved\", \"Stoichiometry of FLAP-5-LO interaction not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Framing FLAP as a nuclear-envelope scaffold for the leukotriene pathway connected its substrate-transfer role to assembly of the full biosynthetic machinery producing both LTB4 and cysteinyl leukotrienes.\",\n      \"evidence\": \"Pharmacological inhibition studies and review of pathway reconstitution\",\n      \"pmids\": [\"19876784\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Review-level synthesis; no new primary assembly data\", \"Direct binding partners within the assembled complex not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Direct knockdown experiments resolved which steps of leukotriene synthesis depend on FLAP, showing it controls perinuclear 5-LO redistribution and stabilizes LTC4 synthase activity without altering 5LO-CLP complex formation.\",\n      \"evidence\": \"siRNA knockdown in Mono Mac 6 cells and primary macrophages with co-IP, immunofluorescence, and product assays\",\n      \"pmids\": [\"25034252\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which FLAP stabilizes LTC4 synthase not defined\", \"Direct physical contact between FLAP and LTC4 synthase not shown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Adipose-specific overexpression revealed that FLAP can redirect output toward lipoxin A4 rather than LTB4, linking it to metabolic regulation and adipose browning.\",\n      \"evidence\": \"Transgenic mouse overexpression with lipid mediator quantification and LXA4 rescue\",\n      \"pmids\": [\"27207555\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism dictating LXA4 versus LTB4 output in adipose tissue unexplained\", \"Single lab; relevance to endogenous FLAP levels unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identifying miR-146a as a direct repressor of FLAP defined a post-transcriptional control circuit and linked FLAP levels to tumor cell behavior in lung and hepatocellular carcinoma.\",\n      \"evidence\": \"Dual luciferase 3'-UTR reporter assays plus miR-146a gain/loss and proliferation/migration/invasion assays in HepG2 and lung cancer cells\",\n      \"pmids\": [\"29928483\", \"35410355\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether FLAP's pro-tumor effects depend on leukotriene output not established\", \"Single-lab functional assays per cancer type\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How FLAP physically presents arachidonic acid to 5-LO and what determines whether the pathway yields pro-inflammatory leukotrienes versus pro-resolving lipoxins remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the FLAP-5-LO substrate-transfer interface in the corpus\", \"Switch governing LTB4 vs LXA4 output uncharacterized at the molecular level\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ALOX5\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}