{"gene":"SLC27A1","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1999,"finding":"FATP1 (SLC27A1) possesses very long chain acyl-CoA synthetase activity, preferentially activating C24:0 over C16:0; active-site mutagenesis (M1: substitution in putative active site residues 249-254; M2: deletion of conserved C-terminal domain residues 464-523) abolished catalytic activity, indicating both domains are required for enzymatic function.","method":"Expression of FATP1-Myc/His in COS1 cells, acyl-CoA synthetase activity assay, active-site mutagenesis, nickel-affinity purification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic assay with site-directed mutagenesis in a single rigorous study","pmids":["10593920"],"is_preprint":false},{"year":1999,"finding":"FATP1 localizes to both the plasma membrane and intracellular membranes in COS1 cells, as determined by immunolocalization of tagged fusion protein.","method":"Immunolocalization of FATP1-Myc/His in COS1 cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 — single localization experiment without strong functional consequence linkage in overexpression context","pmids":["10593920"],"is_preprint":false},{"year":2000,"finding":"Murine FATP1 functionally complements yeast fat1Δ strains, restoring long-chain fatty acid transport, very long chain acyl-CoA synthetase activity, and beta-oxidation of exogenous fatty acids, establishing that FATP1 and yeast Fat1p are functional homologues with dual roles in fatty acid transport and activation.","method":"Yeast complementation assay in fat1Δ strains, fatty acid transport assay, acyl-CoA synthetase activity assay, beta-oxidation assay","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1-2 — genetic complementation with multiple orthogonal biochemical readouts","pmids":["10880966"],"is_preprint":false},{"year":2000,"finding":"Human SLC27A1/FATP-1 mRNA is most highly expressed in muscle and adipose tissue, with intermediate levels in small intestine and barely detectable levels in liver; the gene spans >13 kb, contains 12 exons, and maps to chromosome 19p13.1.","method":"cDNA and gene cloning, Northern blot expression analysis, fluorescence in situ hybridization","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — direct molecular characterization of gene structure and expression pattern","pmids":["10873384"],"is_preprint":false},{"year":2002,"finding":"FATP1 preferentially channels exogenous long-chain fatty acids into triacylglycerol (TG) biosynthesis in 293 cells, increasing DGAT activity, while simultaneously down-regulating de novo sphingomyelin and cholesterol biosynthesis.","method":"Stable overexpression of FATP1 in 293 cells, radiolabeled lipid incorporation assays ([14C]acetate, [3H]oleic acid, [14C]lignoceric acid), DGAT activity assay","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 — gain-of-function with multiple metabolic readouts","pmids":["12235169"],"is_preprint":false},{"year":2005,"finding":"Among the six murine FATP isoforms expressed in yeast, FATP1 (along with FATP2 and FATP4) complements both fatty acid transport and very long chain fatty acid activation defects of fat1Δ faa1Δ yeast, whereas FATP3, 5, and 6 do not complement transport; FATP1 activates C18:1, C20:4 as substrates.","method":"Expression of mmFATP1-6 in fat1Δ faa1Δ yeast, fatty acid transport assays, acyl-CoA synthetase activity assays, subcellular localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — systematic comparative functional study across all isoforms with multiple orthogonal assays","pmids":["15699031"],"is_preprint":false},{"year":2005,"finding":"FATP1 localizes in an intracellular reticular pattern and perinuclear region (partly overlapping with Golgi marker GM-130), distinct from FAT/CD36 which localizes to the extracellular membrane; both proteins similarly stimulate palmitate and oleate transport and incorporation into triacylglyceride in human muscle cells.","method":"Adenoviral delivery of FATP1-EGFP and FAT-EGFP fusion proteins in primary cultured human muscle cells, confocal microscopy, radiolabeled fatty acid transport and oxidation assays","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization with functional consequence in physiologically relevant cell type","pmids":["15897321"],"is_preprint":false},{"year":2006,"finding":"FATP1 is an insulin-sensitive fatty acid transporter: insulin stimulates translocation of FATP1 from an intracellular compartment to the plasma membrane in adipocytes and skeletal muscle, and insulin-stimulated fatty acid uptake is completely abolished in FATP1-null adipocytes and greatly reduced in FATP1-knockout skeletal muscle, while basal LCFA uptake is unaffected. Loss of FATP1 redistributes dietary lipids from adipose/muscle to liver and protects against diet-induced obesity.","method":"FATP1 knockout mice, insulin-stimulated fatty acid uptake assays in isolated adipocytes and skeletal muscle, subcellular fractionation, in vivo metabolic studies","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular and metabolic phenotypes, multiple orthogonal methods","pmids":["16611988"],"is_preprint":false},{"year":2009,"finding":"FATP1 localizes to mitochondria in L6E9 myotubes and rat skeletal muscle, co-immunoprecipitates with carnitine palmitoyltransferase 1 (CPT1), and overexpression of FATP1 increases both fatty acid oxidation and palmitate esterification; etomoxir (irreversible CPT1 inhibitor) blocks all FATP1-mediated effects on mitochondrial fatty acid oxidation.","method":"Adenoviral overexpression in L6E9 myotubes, immunocytochemistry, co-immunoprecipitation, fatty acid oxidation and esterification assays, etomoxir inhibition","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1-2 — Co-IP establishing complex with CPT1, epistasis with etomoxir, multiple functional readouts in muscle cells and in vivo","pmids":["19429947"],"is_preprint":false},{"year":2009,"finding":"FATP1 localizes to mitochondria in cultured myotubes (confirmed by subcellular fractionation and immunocytology of FATP1-GFP), and stimulates CO2 production from glucose while raising pyruvate dehydrogenase (PDH) complex activity and activating the PDH-E1 catalytic subunit.","method":"Subcellular fractionation, immunocytology of FATP1-GFP, PDH complex activity assay, glucose oxidation assays","journal":"Mitochondrion","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization tied to functional enzymatic consequence","pmids":["19361580"],"is_preprint":false},{"year":2009,"finding":"FATP1-dependent production of AMP (via acyl-CoA synthetase activity) activates AMP-activated protein kinase (AMPK) in 3T3-L1 adipocytes; insulin-stimulated palmitate or arachidonate uptake increases AMPK and ACC phosphorylation, and shRNA knockdown of FATP1 attenuates fatty acid-induced AMPK activation.","method":"shRNA knockdown of FATP1 in 3T3-L1 adipocytes, AMPK/ACC phosphorylation assays, AMP/ATP ratio measurement, FATP4 proteoliposome AMP production assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined signaling pathway phenotype","pmids":["19560442"],"is_preprint":false},{"year":2010,"finding":"FATP1 and Acsl1 are required for AMPK activation by both adiponectin and insulin in mouse adipocytes; knockdown of FATP1 eliminates the insulin- and adiponectin-induced rise in AMP/ATP ratio and AMPK activation, demonstrating that FATP1's acyl-CoA synthetase activity drives AMP generation to activate AMPK.","method":"siRNA knockdown of FATP1 and Acsl1 in mouse adipocytes, AMP/ATP ratio measurement, AMPK activation assays, fatty acid uptake assays","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with specific metabolic signaling phenotype replicated across two stimuli","pmids":["20667975"],"is_preprint":false},{"year":2010,"finding":"FATP1 (SLC27A1) interacts with RPE65 and lecithin:retinol acyltransferase (LRAT) in the retinal pigment epithelium, inhibiting 11-cis retinol production by acting on retinyl ester production and RPE65 isomerase activity; the cytosolic C-terminal sequence of FATP1 mediates the interaction with RPE65.","method":"Yeast two-hybrid screen with RPE65, dose-dependent interaction assay, co-localization, cellular reconstitution of interacting proteins, retinol isomerase activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — yeast two-hybrid discovery confirmed by co-localization and functional reconstitution assay","pmids":["20356843"],"is_preprint":false},{"year":2011,"finding":"Overexpression of FATP1 in rat soleus muscle increases palmitate transport and oxidation (but not triacylglycerol esterification), and muscle-specific FATP1 transgenic mice do not develop insulin resistance or intramuscular lipid accumulation on high-fat diet, indicating FATP1 channels fatty acids to oxidation rather than storage in skeletal muscle.","method":"Transient Fatp1 overexpression in isolated soleus, muscle-specific transgenic mice (Mck/Fatp1), in vivo metabolic studies, fatty acid transport and oxidation assays","journal":"Diabetologia","confidence":"High","confidence_rationale":"Tier 2 — multiple in vivo and ex vivo approaches with defined metabolic outcomes","pmids":["21442160"],"is_preprint":false},{"year":2012,"finding":"In 3T3-L1 adipocytes, overexpressed FATP1 and ACSVL4/FATP4 localize to the endoplasmic reticulum (not the plasma membrane), as determined by confocal microscopy and subcellular fractionation; insulin increases fatty acid uptake without changing FATP1 localization, suggesting that enhanced fatty acid uptake by these proteins occurs via metabolic trapping rather than direct plasma membrane transport.","method":"Retroviral transduction of FATP1, FATP4, ACSL1 in 3T3-L1 adipocytes, confocal microscopy, subcellular fractionation, acyl-CoA synthetase activity assay, fatty acid uptake assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 — direct localization with multiple orthogonal methods plus functional uptake data","pmids":["23024797"],"is_preprint":false},{"year":2014,"finding":"FATP1 protein is most abundant in purified mitochondria (specifically in the outer membrane and soluble intermembrane subfraction, not the inner membrane/matrix) of mouse gastrocnemius muscle; overexpression enhances disposal of systemic fatty acids and intramuscular triglycerides and increases palmitate oxidation to CO2, while inhibiting ketone body oxidation.","method":"Differential centrifugation and subcellular fractionation, immunogold electron microscopy of FATP1-GFP in myotubes, adenovirus-mediated FATP1 overexpression in mouse skeletal muscle, palmitate and beta-hydroxybutyrate oxidation assays","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 — precise subcellular localization by immunogold EM and fractionation, tied to defined metabolic phenotype","pmids":["24858472"],"is_preprint":false},{"year":2016,"finding":"FATP1 displays acyl-CoA synthetase activity for long-chain fatty acids in macrophages; loss of FATP1 in macrophages enhances glucose metabolism and exacerbates pro-inflammatory (classically activated) macrophage phenotype, while overexpression of FATP1 decreases glucose metabolism and attenuates inflammation, demonstrating FATP1 regulates macrophage metabolic reprogramming and inflammatory tone.","method":"Fatp1-/- BMDM metabolomics, bioenergetics and inflammatory phenotyping; FATP1-overexpressing RAW 264.7 cells; bone marrow transplant chimeric mice on high-fat diet; flow cytometry, histology, acyl-CoA synthetase activity assay","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function and gain-of-function with multiple orthogonal metabolic and inflammatory readouts plus in vivo chimera model","pmids":["27408776"],"is_preprint":false},{"year":2017,"finding":"FATP1/SLC27A1 at the blood-brain barrier mediates uptake of docosahexaenoic acid (DHA) into brain microvascular endothelial cells, accounting for 59-73% of total DHA uptake; FATP1 also mediates DHA efflux; insulin treatment induces translocation of FATP1 to the plasma membrane in hCMEC/D3 cells and enhances DHA uptake; FATP1 is preferentially localized at the basal membrane of brain microvessels in mouse brain.","method":"FATP1 overexpression in HEK293 cells, siRNA knockdown in hCMEC/D3 cells, [14C]-DHA uptake assays, immunohistochemistry of mouse brain sections, subcellular localization after insulin treatment","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 — siRNA loss-of-function with quantitative transport assay, overexpression gain-of-function, direct localization data","pmids":["28035674"],"is_preprint":false},{"year":2018,"finding":"Among SLC27A family members, melanomas significantly overexpress FATP1/SLC27A1; adipocyte-derived lipids are transferred to melanoma cells via FATP/SLC27A family transporters at the tumor cell surface; pharmacologic blockade of FATPs with Lipofermata reduces lipid transport, melanoma growth and invasion; melanocyte-specific FATP1 expression cooperates with BRAFV600E in transgenic zebrafish to accelerate melanoma.","method":"In vitro co-culture lipid transfer assays, FATP1 transgenic zebrafish, mouse xenograft studies, small-molecule FATP inhibitor (Lipofermata), expression analysis","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 — multiple in vitro and in vivo models, pharmacologic inhibition, transgenic animal model","pmids":["29903879"],"is_preprint":false},{"year":2019,"finding":"PPARα and PPARγ activation suppresses Fatp1 expression in macrophages, attenuating oleate-induced free fatty acid and triglyceride accumulation; TNF-α inhibition of Fatp1 similarly reduces lipid accumulation, placing Fatp1 downstream of PPAR signaling in macrophage lipid influx.","method":"PPAR agonist treatment (WY14643, pioglitazone) and TNF-α treatment of macrophages, metabolomics, Fatp1 expression analysis, fatty acid uptake assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 — pharmacologic epistasis placing FATP1 downstream of PPAR signaling, single lab","pmids":["30674874"],"is_preprint":false},{"year":2019,"finding":"Estrogen receptor-β (ER-β) regulates FATP1/SLC27A1 expression, fatty acid uptake, and cell viability in breast cancer cell lines; FATP1 inhibition with arylpiperazine 5k (DS22420314) reduces fatty acid uptake and cell viability.","method":"Estradiol and ER-β antagonist (PHTPP) treatment in four breast cancer cell lines, FATP1 expression analysis, fatty acid uptake assay, cell viability assay, FATP1 inhibitor treatment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — pharmacologic and receptor antagonist approaches in multiple cell lines, single lab","pmids":["31575907"],"is_preprint":false},{"year":2022,"finding":"Withaferin A (WA) induces white adipose tissue browning through upregulation of Prdm16 and FATP1 (Slc27a1) in inguinal WAT; this effect is blocked by sympathetic chemical denervation, and knockdown of Prdm16 or FATP1 in iWAT abrogates WA-induced browning and weight loss, placing FATP1 downstream of the sympathetic nerve-Prdm16 axis in adipose browning.","method":"Withaferin A treatment in mice, sympathetic denervation, Prdm16 and FATP1 knockdown in inguinal WAT, energy expenditure measurement, adipose browning assays","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo loss-of-function epistasis placing FATP1 in sympathetic nerve-Prdm16 pathway","pmids":["34732538"],"is_preprint":false},{"year":2024,"finding":"Iron reduces FATP1 protein abundance (by ~19.7%) in human brain microvascular endothelial cells without affecting mRNA, and this is associated with up to 32.6% reduction in DHA efflux, demonstrating post-transcriptional regulation of FATP1 protein levels by iron with a direct functional consequence on DHA transport.","method":"Ferric ammonium citrate (FAC) treatment of hCMEC/D3 cells, RT-qPCR, Western blot, [14C]-DHA and [3H]-oleic acid uptake and efflux assays","journal":"Pharmaceutical research","confidence":"Medium","confidence_rationale":"Tier 2 — protein level change linked to transport function in relevant BBB cell model","pmids":["39044044"],"is_preprint":false},{"year":2025,"finding":"Downregulation of SLC27A1 in colorectal cancer cell lines (Caco-2 and T84) significantly inhibits cell migration and invasion, and SLC27A1-mediated transport of long-chain fatty acids promotes synthesis of diacylglycerol-3-phosphate (DAG-3P), which is mechanistically linked to CRC metastasis.","method":"SLC27A1 knockdown in Caco-2 and T84 cells, cell migration and invasion assays, computational analysis of CTC/tumor transcriptome data","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 — single lab, knockdown with cellular phenotype but DAG-3P mechanistic link is primarily computational","pmids":["40883416"],"is_preprint":false}],"current_model":"SLC27A1/FATP1 is an integral membrane very long chain acyl-CoA synthetase that facilitates cellular uptake of long-chain fatty acids through a metabolic trapping mechanism (esterification to acyl-CoA), localizes to both intracellular membranes (ER, mitochondrial outer membrane) and translocates to the plasma membrane in response to insulin; it physically interacts with CPT1 at mitochondria to promote beta-oxidation, generates AMP to activate AMPK, regulates macrophage inflammatory reprogramming via fatty acid vs. glucose substrate choice, supplies DHA across the blood-brain barrier, and interacts with RPE65/LRAT to modulate the visual cycle."},"narrative":{"teleology":[{"year":1999,"claim":"Establishing that FATP1 is not merely a passive transporter but an enzyme with intrinsic very long-chain acyl-CoA synthetase activity answered the fundamental question of how FATP proteins facilitate fatty acid uptake — through metabolic activation rather than channel-like transport.","evidence":"Acyl-CoA synthetase assay and active-site mutagenesis of FATP1-Myc/His in COS1 cells","pmids":["10593920"],"confidence":"High","gaps":["No crystal structure or detailed active-site topology","Substrate specificity across all physiological fatty acid species not fully mapped","Mechanism of membrane topology not resolved"]},{"year":2000,"claim":"Cross-species complementation demonstrated that FATP1 is a functional orthologue of yeast Fat1p with dual transport and activation activities, validating that these coupled functions are evolutionarily conserved.","evidence":"Complementation of yeast fat1Δ strains with murine FATP1, measuring transport, acyl-CoA synthetase activity, and β-oxidation","pmids":["10880966"],"confidence":"High","gaps":["Relative contribution of transport versus activation to net uptake not dissected in mammalian cells","Whether FATP1 forms homodimers or oligomers unresolved"]},{"year":2005,"claim":"Systematic comparison of all six FATP isoforms revealed that only FATP1, FATP2, and FATP4 possess dual transport/activation capability, delineating the functional subgroups within the family and clarifying tissue-specific division of labor.","evidence":"Expression of mmFATP1–6 in fat1Δ faa1Δ yeast with transport and synthetase assays","pmids":["15699031"],"confidence":"High","gaps":["Isoform-specific protein–protein interactions not compared","Tissue-specific regulation of isoform switching not addressed"]},{"year":2006,"claim":"The FATP1 knockout mouse resolved whether FATP1 mediates basal or regulated fatty acid uptake in vivo, showing that it is specifically required for insulin-stimulated — but not basal — long-chain fatty acid uptake in adipocytes and muscle, and that its loss redistributes dietary lipid to the liver.","evidence":"FATP1 knockout mice with insulin-stimulated fatty acid uptake assays in isolated adipocytes and skeletal muscle, subcellular fractionation, in vivo metabolic phenotyping","pmids":["16611988"],"confidence":"High","gaps":["Signaling cascade connecting insulin receptor to FATP1 translocation not identified","Compensatory roles of other FATPs in KO tissues not quantified"]},{"year":2009,"claim":"Discovery that FATP1 localizes to mitochondria and physically interacts with CPT1 established a direct mechanistic link between fatty acid activation at the outer mitochondrial membrane and entry into β-oxidation, while the parallel finding that FATP1-generated AMP activates AMPK connected lipid uptake to cellular energy sensing.","evidence":"Co-immunoprecipitation of FATP1–CPT1 in myotubes, etomoxir epistasis, AMPK/ACC phosphorylation and AMP/ATP ratio measurements after FATP1 knockdown in adipocytes","pmids":["19429947","19560442"],"confidence":"High","gaps":["Direct binding interface between FATP1 and CPT1 not mapped","Whether FATP1-AMPK axis operates in tissues beyond adipocytes and muscle not tested","Stoichiometry of AMP production relative to other AMP sources unknown"]},{"year":2010,"claim":"Identification of FATP1 interaction with RPE65 and LRAT in the retinal pigment epithelium extended its functional repertoire beyond lipid metabolism to visual cycle regulation, showing it inhibits 11-cis retinol production.","evidence":"Yeast two-hybrid, co-localization, and cellular reconstitution of RPE65–FATP1 interaction with retinol isomerase activity assay","pmids":["20356843"],"confidence":"High","gaps":["Physiological relevance in FATP1 KO retina not tested","Whether acyl-CoA synthetase activity is required for visual cycle modulation unclear"]},{"year":2012,"claim":"Demonstrating that overexpressed FATP1 resides on the ER rather than the plasma membrane in adipocytes — and that insulin enhances uptake without changing FATP1 localization — strengthened the metabolic trapping model over a direct transporter model.","evidence":"Confocal microscopy and subcellular fractionation of retrovirally transduced FATP1 in 3T3-L1 adipocytes with fatty acid uptake assays","pmids":["23024797"],"confidence":"High","gaps":["Contradicts earlier translocation findings; whether endogenous versus overexpressed FATP1 differs in trafficking remains unresolved","Identity of the plasma membrane component that collaborates with ER-resident FATP1 not identified"]},{"year":2014,"claim":"Immunogold EM pinpointed FATP1 to the mitochondrial outer membrane and intermembrane space in skeletal muscle, resolving its submitochondrial location and showing it promotes complete fatty acid oxidation to CO2 while suppressing ketone body oxidation.","evidence":"Immunogold EM, differential centrifugation, palmitate and β-hydroxybutyrate oxidation assays in FATP1-overexpressing mouse skeletal muscle","pmids":["24858472"],"confidence":"High","gaps":["How FATP1 suppresses ketone body oxidation mechanistically not explained","Whether intermembrane space pool is functionally distinct from outer membrane pool unknown"]},{"year":2016,"claim":"Loss-of-function and gain-of-function experiments in macrophages revealed that FATP1 controls the fatty acid–glucose metabolic switch that governs inflammatory polarization, expanding FATP1's role from metabolic tissues to innate immunity.","evidence":"Fatp1−/− bone marrow-derived macrophages, FATP1-overexpressing RAW 264.7 cells, bone marrow transplant chimeras on high-fat diet","pmids":["27408776"],"confidence":"High","gaps":["Specific fatty acid species mediating anti-inflammatory effect not identified","Whether FATP1-AMPK axis contributes to macrophage reprogramming not tested"]},{"year":2017,"claim":"Quantitative knockdown established that FATP1 accounts for 59–73% of DHA uptake across brain microvascular endothelial cells and mediates insulin-stimulated DHA transport at the blood–brain barrier, defining a tissue-specific substrate preference.","evidence":"siRNA knockdown in hCMEC/D3 cells, [14C]-DHA uptake assays, immunohistochemistry of mouse brain microvessels","pmids":["28035674"],"confidence":"High","gaps":["In vivo BBB-specific FATP1 deletion not performed","Whether FATP1 cooperates with Mfsd2a for brain DHA supply unclear"]},{"year":2018,"claim":"Demonstration that melanoma cells exploit FATP1 to acquire adipocyte-derived lipids, and that FATP1 cooperates with BRAFV600E in zebrafish melanomagenesis, identified FATP1 as a druggable oncogenic dependency in melanoma.","evidence":"Co-culture lipid transfer assays, FATP1 transgenic zebrafish, mouse xenografts, Lipofermata pharmacologic inhibition","pmids":["29903879"],"confidence":"High","gaps":["Lipofermata selectivity across FATP isoforms not fully characterized","Mechanism by which fatty acid import promotes invasion not resolved"]},{"year":null,"claim":"Key unresolved questions include the structural basis of FATP1 catalysis and membrane topology, the precise signaling intermediates linking insulin receptor activation to FATP1 translocation, the reconciliation of ER-resident versus plasma membrane translocation models, and whether the FATP1-CPT1 interaction is regulated by metabolic state.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure available","Insulin-to-FATP1 translocation signaling cascade unmapped","ER versus plasma membrane localization discrepancy unresolved across cell types"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,2,5]},{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[2,7,17]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,4,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[12]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[14,6]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[8,9,15]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,7,17]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,2,4,5,8,15,16]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,10,11]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[16]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[7,17]},{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[12]}],"complexes":[],"partners":["CPT1A","RPE65","LRAT","ACSL1"],"other_free_text":[]},"mechanistic_narrative":"SLC27A1 (FATP1) is an acyl-CoA synthetase that couples long-chain and very long-chain fatty acid activation to cellular uptake via metabolic trapping, functioning as a central node linking fatty acid import to oxidation, storage, and signaling in metabolically active tissues. The enzyme preferentially activates very long-chain substrates (C24:0 > C16:0) and resides primarily on the endoplasmic reticulum and mitochondrial outer membrane, with insulin stimulating its translocation to the plasma membrane in adipocytes and muscle to drive fatty acid uptake; loss of FATP1 abolishes insulin-stimulated fatty acid import while leaving basal uptake intact [PMID:10593920, PMID:16611988, PMID:23024797]. At mitochondria, FATP1 physically associates with CPT1 to channel fatty acids into β-oxidation and generates AMP through its synthetase reaction to activate AMPK, coupling lipid flux to energy-sensing signaling [PMID:19429947, PMID:19560442, PMID:20667975]. Beyond canonical lipid metabolism, FATP1 governs macrophage inflammatory reprogramming by controlling the balance between fatty acid and glucose utilization, mediates DHA transport across the blood–brain barrier, interacts with RPE65/LRAT to modulate retinoid isomerase activity in the visual cycle, and is exploited by melanoma cells to acquire adipocyte-derived lipids for tumor growth [PMID:27408776, PMID:28035674, PMID:20356843, PMID:29903879]."},"prefetch_data":{"uniprot":{"accession":"Q6PCB7","full_name":"Long-chain fatty acid transport protein 1","aliases":["Arachidonate--CoA ligase","Fatty acid transport protein 1","FATP-1","Long-chain-fatty-acid--CoA ligase","Solute carrier family 27 member 1","Very long-chain acyl-CoA synthetase"],"length_aa":646,"mass_kda":71.1,"function":"Mediates the import of long-chain fatty acids (LCFA) into the cell by facilitating their transport at the plasma membrane (PubMed:12556534, PubMed:20530735, PubMed:21395585, PubMed:28178239). Also functions as an acyl-CoA ligase catalyzing the ATP-dependent formation of fatty acyl-CoA using LCFA and very-long-chain fatty acids (VLCFA) as substrates, which prevents fatty acid efflux from cells and might drive more fatty acid uptake. May act directly as a bona fide transporter, or alternatively, in a cytoplasmic or membrane-associated multimeric protein complex to trap and draw fatty acids towards accumulation. Plays a pivotal role in regulating available LCFA substrates from exogenous sources in tissues undergoing high levels of beta-oxidation or triglyceride synthesis. May be involved in regulation of cholesterol metabolism (By similarity). Probably involved in fatty acid transport across the blood barrier (PubMed:21395585)","subcellular_location":"Cell membrane; Endomembrane system; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q6PCB7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLC27A1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SLC27A1","total_profiled":1310},"omim":[{"mim_id":"604196","title":"SOLUTE CARRIER FAMILY 27 (FATTY ACID TRANSPORTER), MEMBER 6; SLC27A6","url":"https://www.omim.org/entry/604196"},{"mim_id":"604194","title":"SOLUTE CARRIER FAMILY 27 (FATTY ACID TRANSPORTER), MEMBER 4; SLC27A4","url":"https://www.omim.org/entry/604194"},{"mim_id":"604193","title":"SOLUTE CARRIER 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structural features of Acetobacterium woodii F-ATP synthase reveal the importance of the unique subunit γ-loop in Na+ translocation and ATP synthesis.","date":"2019","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/30791207","citation_count":6,"is_preprint":false},{"pmid":"24316832","id":"PMC_24316832","title":"Two-dimensional crystallization of intact F-ATP synthase isolated from bovine heart mitochondria.","date":"2013","source":"Acta crystallographica. Section F, Structural biology and crystallization communications","url":"https://pubmed.ncbi.nlm.nih.gov/24316832","citation_count":6,"is_preprint":false},{"pmid":"39499211","id":"PMC_39499211","title":"SQ31f is a potent non-tuberculous mycobacteria antibiotic by specifically targeting the mycobacterial F-ATP synthase.","date":"2025","source":"The Journal of antimicrobial chemotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/39499211","citation_count":6,"is_preprint":false},{"pmid":"26613566","id":"PMC_26613566","title":"Stoichiometry and deletion analyses of subunits in the heterotrimeric F-ATP synthase c ring from the acetogenic bacterium Acetobacterium woodii.","date":"2015","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/26613566","citation_count":6,"is_preprint":false},{"pmid":"37469400","id":"PMC_37469400","title":"F-ATP synthase inhibitory factor 1 regulates metabolic reprogramming involving its interaction with c-Myc and PGC1α.","date":"2023","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/37469400","citation_count":5,"is_preprint":false},{"pmid":"21328100","id":"PMC_21328100","title":"Association between polymorphisms in the SLC27A1 gene and milk production traits in Chinese Holstein cattle.","date":"2011","source":"Animal biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/21328100","citation_count":5,"is_preprint":false},{"pmid":"37830628","id":"PMC_37830628","title":"Mitochondrial F-ATP Synthase Co-Migrating Proteins and Ca2+-Dependent Formation of Large Channels.","date":"2023","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/37830628","citation_count":5,"is_preprint":false},{"pmid":"39528709","id":"PMC_39528709","title":"N-terminal cleavage of cyclophilin D boosts its ability to bind F-ATP synthase.","date":"2024","source":"Communications 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/40883416","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45793,"output_tokens":6000,"usd":0.113689},"stage2":{"model":"claude-opus-4-6","input_tokens":9607,"output_tokens":3179,"usd":0.191265},"total_usd":0.304954,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"FATP1 (SLC27A1) possesses very long chain acyl-CoA synthetase activity, preferentially activating C24:0 over C16:0; active-site mutagenesis (M1: substitution in putative active site residues 249-254; M2: deletion of conserved C-terminal domain residues 464-523) abolished catalytic activity, indicating both domains are required for enzymatic function.\",\n      \"method\": \"Expression of FATP1-Myc/His in COS1 cells, acyl-CoA synthetase activity assay, active-site mutagenesis, nickel-affinity purification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic assay with site-directed mutagenesis in a single rigorous study\",\n      \"pmids\": [\"10593920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"FATP1 localizes to both the plasma membrane and intracellular membranes in COS1 cells, as determined by immunolocalization of tagged fusion protein.\",\n      \"method\": \"Immunolocalization of FATP1-Myc/His in COS1 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single localization experiment without strong functional consequence linkage in overexpression context\",\n      \"pmids\": [\"10593920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Murine FATP1 functionally complements yeast fat1Δ strains, restoring long-chain fatty acid transport, very long chain acyl-CoA synthetase activity, and beta-oxidation of exogenous fatty acids, establishing that FATP1 and yeast Fat1p are functional homologues with dual roles in fatty acid transport and activation.\",\n      \"method\": \"Yeast complementation assay in fat1Δ strains, fatty acid transport assay, acyl-CoA synthetase activity assay, beta-oxidation assay\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic complementation with multiple orthogonal biochemical readouts\",\n      \"pmids\": [\"10880966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human SLC27A1/FATP-1 mRNA is most highly expressed in muscle and adipose tissue, with intermediate levels in small intestine and barely detectable levels in liver; the gene spans >13 kb, contains 12 exons, and maps to chromosome 19p13.1.\",\n      \"method\": \"cDNA and gene cloning, Northern blot expression analysis, fluorescence in situ hybridization\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct molecular characterization of gene structure and expression pattern\",\n      \"pmids\": [\"10873384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"FATP1 preferentially channels exogenous long-chain fatty acids into triacylglycerol (TG) biosynthesis in 293 cells, increasing DGAT activity, while simultaneously down-regulating de novo sphingomyelin and cholesterol biosynthesis.\",\n      \"method\": \"Stable overexpression of FATP1 in 293 cells, radiolabeled lipid incorporation assays ([14C]acetate, [3H]oleic acid, [14C]lignoceric acid), DGAT activity assay\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function with multiple metabolic readouts\",\n      \"pmids\": [\"12235169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Among the six murine FATP isoforms expressed in yeast, FATP1 (along with FATP2 and FATP4) complements both fatty acid transport and very long chain fatty acid activation defects of fat1Δ faa1Δ yeast, whereas FATP3, 5, and 6 do not complement transport; FATP1 activates C18:1, C20:4 as substrates.\",\n      \"method\": \"Expression of mmFATP1-6 in fat1Δ faa1Δ yeast, fatty acid transport assays, acyl-CoA synthetase activity assays, subcellular localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — systematic comparative functional study across all isoforms with multiple orthogonal assays\",\n      \"pmids\": [\"15699031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FATP1 localizes in an intracellular reticular pattern and perinuclear region (partly overlapping with Golgi marker GM-130), distinct from FAT/CD36 which localizes to the extracellular membrane; both proteins similarly stimulate palmitate and oleate transport and incorporation into triacylglyceride in human muscle cells.\",\n      \"method\": \"Adenoviral delivery of FATP1-EGFP and FAT-EGFP fusion proteins in primary cultured human muscle cells, confocal microscopy, radiolabeled fatty acid transport and oxidation assays\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional consequence in physiologically relevant cell type\",\n      \"pmids\": [\"15897321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FATP1 is an insulin-sensitive fatty acid transporter: insulin stimulates translocation of FATP1 from an intracellular compartment to the plasma membrane in adipocytes and skeletal muscle, and insulin-stimulated fatty acid uptake is completely abolished in FATP1-null adipocytes and greatly reduced in FATP1-knockout skeletal muscle, while basal LCFA uptake is unaffected. Loss of FATP1 redistributes dietary lipids from adipose/muscle to liver and protects against diet-induced obesity.\",\n      \"method\": \"FATP1 knockout mice, insulin-stimulated fatty acid uptake assays in isolated adipocytes and skeletal muscle, subcellular fractionation, in vivo metabolic studies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular and metabolic phenotypes, multiple orthogonal methods\",\n      \"pmids\": [\"16611988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FATP1 localizes to mitochondria in L6E9 myotubes and rat skeletal muscle, co-immunoprecipitates with carnitine palmitoyltransferase 1 (CPT1), and overexpression of FATP1 increases both fatty acid oxidation and palmitate esterification; etomoxir (irreversible CPT1 inhibitor) blocks all FATP1-mediated effects on mitochondrial fatty acid oxidation.\",\n      \"method\": \"Adenoviral overexpression in L6E9 myotubes, immunocytochemistry, co-immunoprecipitation, fatty acid oxidation and esterification assays, etomoxir inhibition\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — Co-IP establishing complex with CPT1, epistasis with etomoxir, multiple functional readouts in muscle cells and in vivo\",\n      \"pmids\": [\"19429947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FATP1 localizes to mitochondria in cultured myotubes (confirmed by subcellular fractionation and immunocytology of FATP1-GFP), and stimulates CO2 production from glucose while raising pyruvate dehydrogenase (PDH) complex activity and activating the PDH-E1 catalytic subunit.\",\n      \"method\": \"Subcellular fractionation, immunocytology of FATP1-GFP, PDH complex activity assay, glucose oxidation assays\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization tied to functional enzymatic consequence\",\n      \"pmids\": [\"19361580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FATP1-dependent production of AMP (via acyl-CoA synthetase activity) activates AMP-activated protein kinase (AMPK) in 3T3-L1 adipocytes; insulin-stimulated palmitate or arachidonate uptake increases AMPK and ACC phosphorylation, and shRNA knockdown of FATP1 attenuates fatty acid-induced AMPK activation.\",\n      \"method\": \"shRNA knockdown of FATP1 in 3T3-L1 adipocytes, AMPK/ACC phosphorylation assays, AMP/ATP ratio measurement, FATP4 proteoliposome AMP production assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined signaling pathway phenotype\",\n      \"pmids\": [\"19560442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FATP1 and Acsl1 are required for AMPK activation by both adiponectin and insulin in mouse adipocytes; knockdown of FATP1 eliminates the insulin- and adiponectin-induced rise in AMP/ATP ratio and AMPK activation, demonstrating that FATP1's acyl-CoA synthetase activity drives AMP generation to activate AMPK.\",\n      \"method\": \"siRNA knockdown of FATP1 and Acsl1 in mouse adipocytes, AMP/ATP ratio measurement, AMPK activation assays, fatty acid uptake assays\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with specific metabolic signaling phenotype replicated across two stimuli\",\n      \"pmids\": [\"20667975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FATP1 (SLC27A1) interacts with RPE65 and lecithin:retinol acyltransferase (LRAT) in the retinal pigment epithelium, inhibiting 11-cis retinol production by acting on retinyl ester production and RPE65 isomerase activity; the cytosolic C-terminal sequence of FATP1 mediates the interaction with RPE65.\",\n      \"method\": \"Yeast two-hybrid screen with RPE65, dose-dependent interaction assay, co-localization, cellular reconstitution of interacting proteins, retinol isomerase activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — yeast two-hybrid discovery confirmed by co-localization and functional reconstitution assay\",\n      \"pmids\": [\"20356843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Overexpression of FATP1 in rat soleus muscle increases palmitate transport and oxidation (but not triacylglycerol esterification), and muscle-specific FATP1 transgenic mice do not develop insulin resistance or intramuscular lipid accumulation on high-fat diet, indicating FATP1 channels fatty acids to oxidation rather than storage in skeletal muscle.\",\n      \"method\": \"Transient Fatp1 overexpression in isolated soleus, muscle-specific transgenic mice (Mck/Fatp1), in vivo metabolic studies, fatty acid transport and oxidation assays\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vivo and ex vivo approaches with defined metabolic outcomes\",\n      \"pmids\": [\"21442160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In 3T3-L1 adipocytes, overexpressed FATP1 and ACSVL4/FATP4 localize to the endoplasmic reticulum (not the plasma membrane), as determined by confocal microscopy and subcellular fractionation; insulin increases fatty acid uptake without changing FATP1 localization, suggesting that enhanced fatty acid uptake by these proteins occurs via metabolic trapping rather than direct plasma membrane transport.\",\n      \"method\": \"Retroviral transduction of FATP1, FATP4, ACSL1 in 3T3-L1 adipocytes, confocal microscopy, subcellular fractionation, acyl-CoA synthetase activity assay, fatty acid uptake assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct localization with multiple orthogonal methods plus functional uptake data\",\n      \"pmids\": [\"23024797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"FATP1 protein is most abundant in purified mitochondria (specifically in the outer membrane and soluble intermembrane subfraction, not the inner membrane/matrix) of mouse gastrocnemius muscle; overexpression enhances disposal of systemic fatty acids and intramuscular triglycerides and increases palmitate oxidation to CO2, while inhibiting ketone body oxidation.\",\n      \"method\": \"Differential centrifugation and subcellular fractionation, immunogold electron microscopy of FATP1-GFP in myotubes, adenovirus-mediated FATP1 overexpression in mouse skeletal muscle, palmitate and beta-hydroxybutyrate oxidation assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — precise subcellular localization by immunogold EM and fractionation, tied to defined metabolic phenotype\",\n      \"pmids\": [\"24858472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FATP1 displays acyl-CoA synthetase activity for long-chain fatty acids in macrophages; loss of FATP1 in macrophages enhances glucose metabolism and exacerbates pro-inflammatory (classically activated) macrophage phenotype, while overexpression of FATP1 decreases glucose metabolism and attenuates inflammation, demonstrating FATP1 regulates macrophage metabolic reprogramming and inflammatory tone.\",\n      \"method\": \"Fatp1-/- BMDM metabolomics, bioenergetics and inflammatory phenotyping; FATP1-overexpressing RAW 264.7 cells; bone marrow transplant chimeric mice on high-fat diet; flow cytometry, histology, acyl-CoA synthetase activity assay\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function and gain-of-function with multiple orthogonal metabolic and inflammatory readouts plus in vivo chimera model\",\n      \"pmids\": [\"27408776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FATP1/SLC27A1 at the blood-brain barrier mediates uptake of docosahexaenoic acid (DHA) into brain microvascular endothelial cells, accounting for 59-73% of total DHA uptake; FATP1 also mediates DHA efflux; insulin treatment induces translocation of FATP1 to the plasma membrane in hCMEC/D3 cells and enhances DHA uptake; FATP1 is preferentially localized at the basal membrane of brain microvessels in mouse brain.\",\n      \"method\": \"FATP1 overexpression in HEK293 cells, siRNA knockdown in hCMEC/D3 cells, [14C]-DHA uptake assays, immunohistochemistry of mouse brain sections, subcellular localization after insulin treatment\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA loss-of-function with quantitative transport assay, overexpression gain-of-function, direct localization data\",\n      \"pmids\": [\"28035674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Among SLC27A family members, melanomas significantly overexpress FATP1/SLC27A1; adipocyte-derived lipids are transferred to melanoma cells via FATP/SLC27A family transporters at the tumor cell surface; pharmacologic blockade of FATPs with Lipofermata reduces lipid transport, melanoma growth and invasion; melanocyte-specific FATP1 expression cooperates with BRAFV600E in transgenic zebrafish to accelerate melanoma.\",\n      \"method\": \"In vitro co-culture lipid transfer assays, FATP1 transgenic zebrafish, mouse xenograft studies, small-molecule FATP inhibitor (Lipofermata), expression analysis\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo models, pharmacologic inhibition, transgenic animal model\",\n      \"pmids\": [\"29903879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PPARα and PPARγ activation suppresses Fatp1 expression in macrophages, attenuating oleate-induced free fatty acid and triglyceride accumulation; TNF-α inhibition of Fatp1 similarly reduces lipid accumulation, placing Fatp1 downstream of PPAR signaling in macrophage lipid influx.\",\n      \"method\": \"PPAR agonist treatment (WY14643, pioglitazone) and TNF-α treatment of macrophages, metabolomics, Fatp1 expression analysis, fatty acid uptake assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pharmacologic epistasis placing FATP1 downstream of PPAR signaling, single lab\",\n      \"pmids\": [\"30674874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Estrogen receptor-β (ER-β) regulates FATP1/SLC27A1 expression, fatty acid uptake, and cell viability in breast cancer cell lines; FATP1 inhibition with arylpiperazine 5k (DS22420314) reduces fatty acid uptake and cell viability.\",\n      \"method\": \"Estradiol and ER-β antagonist (PHTPP) treatment in four breast cancer cell lines, FATP1 expression analysis, fatty acid uptake assay, cell viability assay, FATP1 inhibitor treatment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — pharmacologic and receptor antagonist approaches in multiple cell lines, single lab\",\n      \"pmids\": [\"31575907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Withaferin A (WA) induces white adipose tissue browning through upregulation of Prdm16 and FATP1 (Slc27a1) in inguinal WAT; this effect is blocked by sympathetic chemical denervation, and knockdown of Prdm16 or FATP1 in iWAT abrogates WA-induced browning and weight loss, placing FATP1 downstream of the sympathetic nerve-Prdm16 axis in adipose browning.\",\n      \"method\": \"Withaferin A treatment in mice, sympathetic denervation, Prdm16 and FATP1 knockdown in inguinal WAT, energy expenditure measurement, adipose browning assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function epistasis placing FATP1 in sympathetic nerve-Prdm16 pathway\",\n      \"pmids\": [\"34732538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Iron reduces FATP1 protein abundance (by ~19.7%) in human brain microvascular endothelial cells without affecting mRNA, and this is associated with up to 32.6% reduction in DHA efflux, demonstrating post-transcriptional regulation of FATP1 protein levels by iron with a direct functional consequence on DHA transport.\",\n      \"method\": \"Ferric ammonium citrate (FAC) treatment of hCMEC/D3 cells, RT-qPCR, Western blot, [14C]-DHA and [3H]-oleic acid uptake and efflux assays\",\n      \"journal\": \"Pharmaceutical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — protein level change linked to transport function in relevant BBB cell model\",\n      \"pmids\": [\"39044044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Downregulation of SLC27A1 in colorectal cancer cell lines (Caco-2 and T84) significantly inhibits cell migration and invasion, and SLC27A1-mediated transport of long-chain fatty acids promotes synthesis of diacylglycerol-3-phosphate (DAG-3P), which is mechanistically linked to CRC metastasis.\",\n      \"method\": \"SLC27A1 knockdown in Caco-2 and T84 cells, cell migration and invasion assays, computational analysis of CTC/tumor transcriptome data\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, knockdown with cellular phenotype but DAG-3P mechanistic link is primarily computational\",\n      \"pmids\": [\"40883416\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLC27A1/FATP1 is an integral membrane very long chain acyl-CoA synthetase that facilitates cellular uptake of long-chain fatty acids through a metabolic trapping mechanism (esterification to acyl-CoA), localizes to both intracellular membranes (ER, mitochondrial outer membrane) and translocates to the plasma membrane in response to insulin; it physically interacts with CPT1 at mitochondria to promote beta-oxidation, generates AMP to activate AMPK, regulates macrophage inflammatory reprogramming via fatty acid vs. glucose substrate choice, supplies DHA across the blood-brain barrier, and interacts with RPE65/LRAT to modulate the visual cycle.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SLC27A1 (FATP1) is an acyl-CoA synthetase that couples long-chain and very long-chain fatty acid activation to cellular uptake via metabolic trapping, functioning as a central node linking fatty acid import to oxidation, storage, and signaling in metabolically active tissues. The enzyme preferentially activates very long-chain substrates (C24:0 > C16:0) and resides primarily on the endoplasmic reticulum and mitochondrial outer membrane, with insulin stimulating its translocation to the plasma membrane in adipocytes and muscle to drive fatty acid uptake; loss of FATP1 abolishes insulin-stimulated fatty acid import while leaving basal uptake intact [PMID:10593920, PMID:16611988, PMID:23024797]. At mitochondria, FATP1 physically associates with CPT1 to channel fatty acids into β-oxidation and generates AMP through its synthetase reaction to activate AMPK, coupling lipid flux to energy-sensing signaling [PMID:19429947, PMID:19560442, PMID:20667975]. Beyond canonical lipid metabolism, FATP1 governs macrophage inflammatory reprogramming by controlling the balance between fatty acid and glucose utilization, mediates DHA transport across the blood–brain barrier, interacts with RPE65/LRAT to modulate retinoid isomerase activity in the visual cycle, and is exploited by melanoma cells to acquire adipocyte-derived lipids for tumor growth [PMID:27408776, PMID:28035674, PMID:20356843, PMID:29903879].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing that FATP1 is not merely a passive transporter but an enzyme with intrinsic very long-chain acyl-CoA synthetase activity answered the fundamental question of how FATP proteins facilitate fatty acid uptake — through metabolic activation rather than channel-like transport.\",\n      \"evidence\": \"Acyl-CoA synthetase assay and active-site mutagenesis of FATP1-Myc/His in COS1 cells\",\n      \"pmids\": [\"10593920\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure or detailed active-site topology\", \"Substrate specificity across all physiological fatty acid species not fully mapped\", \"Mechanism of membrane topology not resolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Cross-species complementation demonstrated that FATP1 is a functional orthologue of yeast Fat1p with dual transport and activation activities, validating that these coupled functions are evolutionarily conserved.\",\n      \"evidence\": \"Complementation of yeast fat1Δ strains with murine FATP1, measuring transport, acyl-CoA synthetase activity, and β-oxidation\",\n      \"pmids\": [\"10880966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of transport versus activation to net uptake not dissected in mammalian cells\", \"Whether FATP1 forms homodimers or oligomers unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Systematic comparison of all six FATP isoforms revealed that only FATP1, FATP2, and FATP4 possess dual transport/activation capability, delineating the functional subgroups within the family and clarifying tissue-specific division of labor.\",\n      \"evidence\": \"Expression of mmFATP1–6 in fat1Δ faa1Δ yeast with transport and synthetase assays\",\n      \"pmids\": [\"15699031\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Isoform-specific protein–protein interactions not compared\", \"Tissue-specific regulation of isoform switching not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The FATP1 knockout mouse resolved whether FATP1 mediates basal or regulated fatty acid uptake in vivo, showing that it is specifically required for insulin-stimulated — but not basal — long-chain fatty acid uptake in adipocytes and muscle, and that its loss redistributes dietary lipid to the liver.\",\n      \"evidence\": \"FATP1 knockout mice with insulin-stimulated fatty acid uptake assays in isolated adipocytes and skeletal muscle, subcellular fractionation, in vivo metabolic phenotyping\",\n      \"pmids\": [\"16611988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling cascade connecting insulin receptor to FATP1 translocation not identified\", \"Compensatory roles of other FATPs in KO tissues not quantified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that FATP1 localizes to mitochondria and physically interacts with CPT1 established a direct mechanistic link between fatty acid activation at the outer mitochondrial membrane and entry into β-oxidation, while the parallel finding that FATP1-generated AMP activates AMPK connected lipid uptake to cellular energy sensing.\",\n      \"evidence\": \"Co-immunoprecipitation of FATP1–CPT1 in myotubes, etomoxir epistasis, AMPK/ACC phosphorylation and AMP/ATP ratio measurements after FATP1 knockdown in adipocytes\",\n      \"pmids\": [\"19429947\", \"19560442\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding interface between FATP1 and CPT1 not mapped\", \"Whether FATP1-AMPK axis operates in tissues beyond adipocytes and muscle not tested\", \"Stoichiometry of AMP production relative to other AMP sources unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of FATP1 interaction with RPE65 and LRAT in the retinal pigment epithelium extended its functional repertoire beyond lipid metabolism to visual cycle regulation, showing it inhibits 11-cis retinol production.\",\n      \"evidence\": \"Yeast two-hybrid, co-localization, and cellular reconstitution of RPE65–FATP1 interaction with retinol isomerase activity assay\",\n      \"pmids\": [\"20356843\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance in FATP1 KO retina not tested\", \"Whether acyl-CoA synthetase activity is required for visual cycle modulation unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating that overexpressed FATP1 resides on the ER rather than the plasma membrane in adipocytes — and that insulin enhances uptake without changing FATP1 localization — strengthened the metabolic trapping model over a direct transporter model.\",\n      \"evidence\": \"Confocal microscopy and subcellular fractionation of retrovirally transduced FATP1 in 3T3-L1 adipocytes with fatty acid uptake assays\",\n      \"pmids\": [\"23024797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contradicts earlier translocation findings; whether endogenous versus overexpressed FATP1 differs in trafficking remains unresolved\", \"Identity of the plasma membrane component that collaborates with ER-resident FATP1 not identified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Immunogold EM pinpointed FATP1 to the mitochondrial outer membrane and intermembrane space in skeletal muscle, resolving its submitochondrial location and showing it promotes complete fatty acid oxidation to CO2 while suppressing ketone body oxidation.\",\n      \"evidence\": \"Immunogold EM, differential centrifugation, palmitate and β-hydroxybutyrate oxidation assays in FATP1-overexpressing mouse skeletal muscle\",\n      \"pmids\": [\"24858472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How FATP1 suppresses ketone body oxidation mechanistically not explained\", \"Whether intermembrane space pool is functionally distinct from outer membrane pool unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Loss-of-function and gain-of-function experiments in macrophages revealed that FATP1 controls the fatty acid–glucose metabolic switch that governs inflammatory polarization, expanding FATP1's role from metabolic tissues to innate immunity.\",\n      \"evidence\": \"Fatp1−/− bone marrow-derived macrophages, FATP1-overexpressing RAW 264.7 cells, bone marrow transplant chimeras on high-fat diet\",\n      \"pmids\": [\"27408776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific fatty acid species mediating anti-inflammatory effect not identified\", \"Whether FATP1-AMPK axis contributes to macrophage reprogramming not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Quantitative knockdown established that FATP1 accounts for 59–73% of DHA uptake across brain microvascular endothelial cells and mediates insulin-stimulated DHA transport at the blood–brain barrier, defining a tissue-specific substrate preference.\",\n      \"evidence\": \"siRNA knockdown in hCMEC/D3 cells, [14C]-DHA uptake assays, immunohistochemistry of mouse brain microvessels\",\n      \"pmids\": [\"28035674\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo BBB-specific FATP1 deletion not performed\", \"Whether FATP1 cooperates with Mfsd2a for brain DHA supply unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstration that melanoma cells exploit FATP1 to acquire adipocyte-derived lipids, and that FATP1 cooperates with BRAFV600E in zebrafish melanomagenesis, identified FATP1 as a druggable oncogenic dependency in melanoma.\",\n      \"evidence\": \"Co-culture lipid transfer assays, FATP1 transgenic zebrafish, mouse xenografts, Lipofermata pharmacologic inhibition\",\n      \"pmids\": [\"29903879\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Lipofermata selectivity across FATP isoforms not fully characterized\", \"Mechanism by which fatty acid import promotes invasion not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of FATP1 catalysis and membrane topology, the precise signaling intermediates linking insulin receptor activation to FATP1 translocation, the reconciliation of ER-resident versus plasma membrane translocation models, and whether the FATP1-CPT1 interaction is regulated by metabolic state.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure available\", \"Insulin-to-FATP1 translocation signaling cascade unmapped\", \"ER versus plasma membrane localization discrepancy unresolved across cell types\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [2, 7, 17]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [14, 6]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [8, 9, 15]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 7, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 2, 4, 5, 8, 15, 16]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 10, 11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [7, 17]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CPT1A\",\n      \"RPE65\",\n      \"LRAT\",\n      \"ACSL1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}