{"gene":"SLC7A5","run_date":"2026-06-10T07:46:34","timeline":{"discoveries":[{"year":1998,"finding":"The CD98 light chain is identical to the TA1/E16 protein (SLC7A5), established by partial amino acid sequence identity from mass spectrometry, antibody cross-reactivity, and co-immunoprecipitation of hemagglutinin-tagged E16/SLC7A5 with anti-CD98 heavy chain antibody.","method":"Mass spectrometry peptide sequencing, co-immunoprecipitation, immunoblotting, genetic reconstitution","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, MS-based peptide ID, antibody cross-reactivity, and reconstitution all converging on the same conclusion in one study","pmids":["9837878"],"is_preprint":false},{"year":1999,"finding":"CD98 light chain (SLC7A5/LAT1) is almost identical to the amino acid transporter E16; the gene maps to human chromosome 16q24. The CD98LC/SLC7A5 protein was co-purified with the CD98 heavy chain from HeLa cells.","method":"Affinity purification, N-terminal protein sequencing, cDNA cloning, FISH","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — protein purification and sequence confirmed identity; single lab","pmids":["10072483"],"is_preprint":false},{"year":2018,"finding":"SLC7A5 (LAT1) forms a heterodimeric amino acid transporter with the glycoprotein CD98 (SLC3A2) through a conserved disulfide bond; in proteoliposomes reconstituted with recombinant human LAT1, transport is Na⁺- and pH-independent antiport; the preferred substrate is histidine; CD98 is not required for transport activity and is instead involved in routing LAT1 to the plasma membrane.","method":"Proteoliposome reconstitution with recombinant protein, radiolabeled transport assay, site-directed mutagenesis","journal":"Frontiers in chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution in proteoliposomes with recombinant protein, replicated across multiple studies reviewed in the paper","pmids":["29988369"],"is_preprint":false},{"year":2017,"finding":"Residues F252, S342, and C335 are crucial for substrate recognition in LAT1 (SLC7A5); C407 plays a minor role. The transporter preferentially adopts a dimeric structure and catalyzes antiport following a simultaneous random mechanism. K⁺ has regulatory properties on LAT1 similar to LeuT.","method":"Site-directed mutagenesis, chemical modification, transport assay in proteoliposomes, bioinformatics","journal":"Biochimica et biophysica acta. General subjects","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and functional assay; single lab, multiple orthogonal methods","pmids":["28088504"],"is_preprint":false},{"year":2017,"finding":"Cysteine residue C407 in the substrate binding site of LAT1 (SLC7A5) forms a covalent disulfide bond with dithiazole/dithiazine inhibitors, confirmed by loss of inhibition in the C407A mutant and reversal of inhibition by dithioerythritol. These covalent inhibitors show IC50 <1 µM and cause cell death in SLC7A5-expressing cancer cells.","method":"Proteoliposome transport assay, site-directed mutagenesis (C407A), molecular docking, cell viability assay","journal":"Biochemical pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution, mutagenesis, and functional rescue in a single rigorous study","pmids":["28709952"],"is_preprint":false},{"year":2017,"finding":"Cholesterol depletion reduces the Vmax but not the Km of LAT1-mediated transport, indicating cholesterol modulates transporter activity by stabilizing a specific conformational state. A soluble cholesterol analogue was required for stable purification of the LAT1/CD98 complex with retained substrate-binding activity.","method":"Cellular uptake assay with cholesterol depletion, protein purification with cholesterol analogue, substrate binding assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional uptake assay plus purification; single lab, two methods","pmids":["28272458"],"is_preprint":false},{"year":2020,"finding":"ATP synergistically stimulates LAT1 (SLC7A5) transport activity in the presence of cholesterol, selectively increasing substrate affinity at the internal site (suggesting stabilization of inward-open conformation). Computational docking and site-directed mutagenesis identified Lys204 as the ATP interaction residue; the K204Q mutant showed impaired function and abolished ATP response.","method":"Proteoliposome transport assay, computational docking, site-directed mutagenesis (K204Q)","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and structural modeling in one study; single lab","pmids":["33028978"],"is_preprint":false},{"year":2019,"finding":"PKC activation by PMA triggers efficient endocytosis and degradation of LAT1 (SLC7A5) in HeLa cells, mediated by Nedd4-2 ubiquitin ligase. Systematic mutagenesis identified three lysines (K19, K25, K30) in the N-terminal cytosolic tail as required for PMA-induced ubiquitylation and downregulation.","method":"Endocytosis assay, ubiquitylation assay, Nedd4-2 siRNA knockdown, systematic lysine mutagenesis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO-knockdown with defined cellular phenotype plus systematic mutagenesis; single lab, multiple orthogonal methods","pmids":["31728037"],"is_preprint":false},{"year":2012,"finding":"HIF2α activates mTORC1 by transcriptionally upregulating SLC7A5 expression; HIF2α binds directly to the Slc7a5 proximal promoter. This pathway links oxygen sensing to mTORC1 activation and accounts for tumor-promoting properties of HIF2α in VHL-deficient cells.","method":"Reporter assay, chromatin immunoprecipitation (ChIP), genetic overexpression/knockdown, mTORC1 activity assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct promoter binding plus functional mTORC1 readout; replicated in multiple cell contexts (liver, lung, VHL-deficient cells)","pmids":["23103253"],"is_preprint":false},{"year":2019,"finding":"Wnt/β-catenin signaling directly supports Slc7a5 expression; loss of Wnt/β-catenin inhibits Slc7a5 and induces the integrated stress response (aberrant mTORC1 activity, increased apoptosis). Slc7a5-null mouse embryos display profound neural and limb bud outgrowth defects accompanied by induction of the integrated stress response.","method":"Slc7a5-null mouse embryo analysis, transcriptomics, phosphoprotein analysis, apoptosis assay, genetic epistasis with Wnt pathway mutants","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout with multiple orthogonal readouts (transcriptomics, phosphorylation, apoptosis) and genetic epistasis","pmids":["31789450"],"is_preprint":false},{"year":2014,"finding":"Muscle-specific knockout of Slc7a5 blunts leucine-induced mTOR-S6K (Thr389) phosphorylation in skeletal muscle in vivo, and reduces intramuscular leucine/isoleucine concentrations and S6K activity on low-protein diets, demonstrating that SLC7A5 is required for LNAA-dependent mTOR-S6K pathway activation in skeletal muscle.","method":"Conditional Cre-lox knockout (MCK-Cre), intraperitoneal leucine injection, phosphoprotein analysis (S6K Thr389), amino acid measurement","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with clean physiological and biochemical phenotypic readout in vivo","pmids":["24586861"],"is_preprint":false},{"year":2021,"finding":"SLC7A5 is critical for KRAS-mutant colorectal cancer growth; mechanistically it maintains intracellular amino acid levels after KRAS activation to support increased bulk protein synthesis. Combined deletion of Slc7a5 and mTORC1 inhibition abrogates established Kras-mutant tumor growth.","method":"Conditional mouse knockout, metabolic tracing, protein synthesis assay, tumor growth assay, genetic epistasis with mTORC1 pathway","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional knockout in disease model with multiple orthogonal metabolic and functional readouts","pmids":["33414552"],"is_preprint":false},{"year":2020,"finding":"Slc7a5 knockdown in cerebellar granule cell precursors reduces mTOR pathway activity and impairs late-phase granule cell dendrite maturation and survival; these defects are rescued by constitutively active Rheb (an mTOR activator), placing SLC7A5 upstream of mTOR in neuronal development.","method":"In vivo electroporation-based knockdown, mTOR pathway phosphorylation assay, morphological analysis, genetic rescue with Rheb","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockdown with genetic rescue demonstrating epistasis to mTOR; multiple readouts","pmids":["32821949"],"is_preprint":false},{"year":2018,"finding":"SLC7A5-mediated leucine influx activates mTORC1 and drives pro-inflammatory cytokine (IL-1β) production and glycolytic reprogramming in activated human monocytes/macrophages; pharmacological blockade or silencing of SLC7A5 reduces mTORC1 activity, glycolysis (measured as ECAR), and IL-1β production.","method":"siRNA knockdown, pharmacological inhibition, mTORC1 activity assay, metabolic flux (ECAR), cytokine measurement","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with defined metabolic phenotype; single lab, two orthogonal methods","pmids":["29422900"],"is_preprint":false},{"year":2018,"finding":"Slc7a5 co-expression with Kv1.2 dramatically hyperpolarizes the voltage-dependence of Kv1.2 activation by ~47 mV, reduces total Kv1.2 protein, and accelerates inactivation; these effects are attenuated by co-expression of Slc3a2. Disease-linked Slc7a5 mutations show a localization defect and attenuated effects on Kv1.2. Epilepsy-linked gain-of-function Kv1.2 mutants show enhanced sensitivity to Slc7a5.","method":"Mass spectrometry interactome screen, co-expression in heterologous system, whole-cell electrophysiology, Western blot, immunofluorescence","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — identified via unbiased MS screen, followed by electrophysiology and protein expression; multiple orthogonal methods; disease mutation validation","pmids":["30356053"],"is_preprint":false},{"year":2020,"finding":"Slc7a5 regulates Kv1.1 channels by inhibiting channel activity; this inhibition can be reversed by supraphysiological hyperpolarization. Exchange of the voltage-sensing domain between Kv1.1 and Kv1.2 controls Slc7a5 sensitivity, and a specific position in the S1 segment is a major determinant of Slc7a5 modulation.","method":"Knockdown of endogenous Slc7a5, chimeric channel electrophysiology, heterologous expression, whole-cell patch clamp","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — channel chimeras plus knockdown with defined electrophysiological readouts; single lab, multiple orthogonal methods","pmids":["33164746"],"is_preprint":false},{"year":2020,"finding":"Slc7a5-mediated current suppression of Kv1.2 is attenuated when Kvβ1.2 is co-expressed; however, gating shifts and modified inactivation properties from both Slc7a5 and Kvβ are additive, demonstrating convergent but independent regulation of Kv1.2 by the two accessory proteins.","method":"Co-expression in heterologous system, whole-cell electrophysiology, Western blot","journal":"The Journal of general physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional electrophysiology with defined mechanistic conclusions; single lab","pmids":["32311044"],"is_preprint":false},{"year":2013,"finding":"Gabapentin is a substrate of LAT1 (SLC7A5); Km values of 530 µM (in brain endothelial cells) and 217 µM (in LAT1-transfected HEK293 cells) were determined by kinetic analysis. LAT1-mediated transport was 3–10-fold higher than other transport processes at physiological concentrations.","method":"Radiolabeled uptake assay, siRNA knockdown, LAT1 overexpression in HEK293 cells, Michaelis-Menten kinetics, mathematical modelling","journal":"Biochemical pharmacology","confidence":"High","confidence_rationale":"Tier 2 / Strong — kinetic characterization in two independent cell systems with siRNA and overexpression; multiple orthogonal approaches","pmids":["23567998"],"is_preprint":false},{"year":2018,"finding":"LAT1 (SLC7A5) transports pregabalin; overexpression of LAT1 but not LAT2 in HEK293 cells increases pregabalin uptake with Km of 0.288 mM. LAT1 siRNA knockdown in hCMEC/D3 cells reduces pregabalin uptake by 75%.","method":"Transporter overexpression in HEK293, LC-MS/MS uptake assay, siRNA knockdown, competitive inhibition assay","journal":"Pharmaceutical research","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function overexpression and loss-of-function knockdown with kinetic characterization; multiple orthogonal approaches","pmids":["30374619"],"is_preprint":false},{"year":2016,"finding":"Dexamethasone downregulates SLC7A5 expression via glucocorticoid receptor (GR)-mediated transrepression; GR binds the proximal promoter of SLC7A5. The resulting reduction in amino acid uptake inhibits mTOR signaling, causing G1/S cell cycle arrest, enhanced autophagy and apoptosis in BeWo placental cells. The GR antagonist RU486 abolishes these effects.","method":"ChIP, reporter assay (GR nuclear translocation), siRNA knockdown of SLC7A5, mTOR pathway analysis, cell cycle analysis, GR antagonist treatment","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct GR binding at SLC7A5 promoter; pharmacological rescue; multiple orthogonal functional readouts","pmids":["26094588"],"is_preprint":false},{"year":2019,"finding":"Hypoxia upregulates Slc7a5 expression in differentiated neuronal cells through HIF-2α, which binds directly to the proximal promoter of Slc7a5. shRNA knockdown of HIF-2α (but not HIF-1α) markedly reduces hypoxia-induced Slc7a5 upregulation.","method":"ChIP, shRNA knockdown of HIF-2α and HIF-1α, qRT-PCR","journal":"FEBS open bio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus isoform-specific knockdown; single lab","pmids":["30761250"],"is_preprint":false},{"year":2014,"finding":"Insulin (0.5 nmol/L) increases SLC7A5/LAT1 mRNA abundance in C2C12 myotubes via an mTORC1-dependent mechanism; both low and high doses of rapamycin prevent this induction, placing SLC7A5 regulation downstream of mTORC1.","method":"mTORC1 inhibition with rapamycin, phosphoprotein analysis (S6K1, S6), mRNA quantification (qRT-PCR)","journal":"Physiological reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological epistasis with dose-response; single lab","pmids":["24760501"],"is_preprint":false},{"year":2011,"finding":"miR-126 directly targets SLC7A5; siRNA-mediated suppression of SLC7A5 phenocopies miR-126 overexpression (G1 delay, proliferation inhibition) in H69 small cell lung cancer cells.","method":"miRNA overexpression, siRNA knockdown, cell cycle analysis, proliferation assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct target validation by phenocopy with siRNA; single lab","pmids":["21439283"],"is_preprint":false},{"year":2018,"finding":"ASCT2 (SLC1A5) knockout significantly reduces glutamine import but does not affect leucine uptake via LAT1, and does not alter mTORC1 activity or the GCN2/EIF2a/ATF4 amino acid stress response, contrary to the proposed functional coupling model of ASCT2 feeding LAT1-mediated mTORC1 activation.","method":"CRISPR-Cas9 knockout of ASCT2 or LAT1, amino acid uptake assay, mTORC1 activity assay (S6K1/S6), GCN2 pathway analysis, tumor growth assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean CRISPR KO in two cancer cell lines with multiple orthogonal biochemical readouts; directly tests and negates a prior mechanistic model","pmids":["29326164"],"is_preprint":false},{"year":2023,"finding":"SRC2 (steroid nuclear receptor coactivator 2) co-activates c-Myc to stimulate Slc7a5 expression in CD4⁺ T cells; SRC2-deficient T cells fail to upregulate Slc7a5, and forced expression of Slc7a5 rescues proliferation, cytokine production, and the ability to induce EAE.","method":"Conditional T cell-specific knockout, forced gene expression rescue, in vitro and in vivo functional assays (proliferation, cytokine production), adoptive transfer","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue experiment places SRC2/c-Myc/Slc7a5 in a linear pathway; multiple in vitro and in vivo functional readouts","pmids":["37094160"],"is_preprint":false},{"year":2018,"finding":"l-Leucine influx through Slc7a5 is required for mTORC1 activation, plasmablast differentiation, and production of IgG and inflammatory cytokines in CpG-stimulated human B cells. CpG stimulation induces Slc7a5 expression and leucine uptake; Slc7a5 inhibition abrogates these responses.","method":"RT-PCR, flow cytometry, radioisotope uptake assay, pharmacological inhibition, mTORC1 activity assay","journal":"Modern rheumatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional inhibition with multiple downstream readouts; single lab","pmids":["30092695"],"is_preprint":false},{"year":2024,"finding":"TRIM35 E3 ubiquitin ligase interacts with, ubiquitinates, and upregulates the amino acid transporter SLC7A5 in cardiac fibroblasts, enhancing amino acid transport and mTORC1 activation. Overexpression of SLC7A5 reverses the reduced cardiac fibrosis caused by TRIM35 conditional knockout.","method":"LC-MS/MS, co-immunoprecipitation, ubiquitination assay, conditional knockout in mice, SLC7A5 rescue overexpression, mTORC1 activity assay","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ubiquitination assay with in vivo rescue; single lab","pmids":["39304904"],"is_preprint":false},{"year":2023,"finding":"LAT1 (SLC7A5) transports copper(II)-histidinate [Cu(His)₂] via an unconventional uniport mechanism, distinct from its canonical antiport of amino acids. Site-directed mutagenesis, radiolabeled transport assays, mass spectrometry, and crystal structure of the Cu(His)₂ complex confirmed transport and identified the binding interaction.","method":"Bioinformatics, site-directed mutagenesis, radiolabeled transport assay, mass spectrometry, crystallography of substrate complex","journal":"iScience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, MS, and structural characterization of the substrate complex; single lab, multiple orthogonal methods","pmids":["37692288"],"is_preprint":false},{"year":2022,"finding":"SLC7A5 (LAT1) is required for normal secretory cell differentiation in mouse intestinal epithelium; intestinal epithelial cell-specific knockout reduces mTORC1 signaling, causes dedifferentiation of Paneth cells (with loss of secretory granules), and alters goblet cell distribution, resulting in indirect increases in crypt cell proliferation.","method":"IEC-specific conditional knockout (Slc7a5ΔIEC), scRNA-seq, electron microscopy, mTORC1 pathway analysis","journal":"International journal of biological sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional in vivo knockout with multiple orthogonal readouts (scRNA-seq, EM, biochemistry)","pmids":["38617535"],"is_preprint":false},{"year":2025,"finding":"SLC7A5 functions as a citrulline transporter under arginine-limited conditions; isotope tracing shows citrulline uptake and conversion to arginine are dependent on SLC7A5 expression. Loss of SLC7A5 reduces tumor growth and citrulline import in a mouse tumor model.","method":"CRISPR-Cas9 functional screen, isotope tracing (citrulline metabolism), pharmacological inhibition, mouse tumor model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — isotope tracing demonstrates substrate transport in a clean KO background; confirmed in vivo","pmids":["39756034"],"is_preprint":false},{"year":2025,"finding":"LAT1 (SLC7A5) promotes TNBC progression and chemoresistance by facilitating L-tryptophan uptake and upregulating QPRT (rate-limiting enzyme in de novo NAD⁺ synthesis), increasing the cytosolic NAD⁺/NADH ratio, which enhances phosphorylation of PKM2 and LDHA to amplify glycolysis.","method":"LAT1 knockdown and pharmacological inhibition, steady-state polar metabolite profiling (LC-MS), pyruvate/lactate assay, Seahorse metabolic assay, in vivo orthotopic and PDX mouse models","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — metabolite profiling plus functional assays link LAT1 to tryptophan/NAD⁺ axis; single lab","pmids":["40611146"],"is_preprint":false},{"year":2024,"finding":"IGF2BP2 enhances SLC7A5 mRNA stability and translation through m6A modification; SLC7A5-mediated methionine transport supports S-adenosylmethionine production, which increases H3K4me3 at the IGF2BP2 promoter to form a positive feedback loop. FBW7/GSK3β ubiquitinate and degrade IGF2BP2 to break this loop.","method":"ChIP-qPCR, RIP, MeRIP-qPCR, RNA pull-down, co-immunoprecipitation, ubiquitination assay","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple RNA-protein interaction methods; single lab","pmids":["38281999"],"is_preprint":false},{"year":2015,"finding":"Diesel exhaust particle extract induces LAT1 (SLC7A5)/CD98hc expression and LAT1-mediated leucine transport in bronchial epithelial cells via the aryl hydrocarbon receptor (AhR) pathway; AhR antagonist or AhR siRNA prevents this induction. CD98hc induction subsequently activates the integrin/FAK/ERK signaling pathway, upregulating MMP-2.","method":"Chemical AhR antagonist, siRNA knockdown of AhR, mRNA and protein expression analysis, leucine accumulation assay, MMP-2 activity assay","journal":"Toxicology and applied pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis plus pharmacological inhibition; single lab","pmids":["26621329"],"is_preprint":false},{"year":2022,"finding":"SLC7A5 (LAT1) mediates methylmercury-L-cysteine conjugate uptake in placental cells; LAT1-depleted HTR-8/SVneo cells accumulate less MeHg but are more susceptible to MeHg toxicity due to lower glutathione (GSH) levels, demonstrating that LAT1-mediated amino acid transport is essential for de novo GSH synthesis and oxidative stress defense.","method":"siRNA knockdown of LAT1, MeHg uptake measurement, cell viability, apoptosis, oxidative stress assays, GSH measurement","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean siRNA KD with mechanistic linkage to GSH; single lab","pmids":["33567754"],"is_preprint":false},{"year":2022,"finding":"SLC7A5 (LAT1) is required for normal myoblast viability, differentiation, and fusion; pharmacological inhibition and genetic knockdown both impair these processes. LAT1 expression decreases during myotube differentiation and is reduced under atrophic conditions in vitro.","method":"Pharmacological inhibition, genetic knockdown (siRNA), myogenesis assays (viability, differentiation, fusion), Western blot","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — parallel pharmacological and genetic approaches; single lab","pmids":["35848618"],"is_preprint":false},{"year":2022,"finding":"Intrathecal administration of the LAT1 (SLC7A5) inhibitor JPH203 alleviates allodynia in the spared nerve injury mouse model of neuropathic pain. JPH203 treatment reduces excitability of small-diameter DRG neurons from SNI mice and affects tetrodotoxin-resistant sodium currents in naive rat DRG neurons.","method":"Intrathecal drug administration, behavioral assay (allodynia), whole-cell electrophysiology (current-clamp and voltage-clamp), Western blot, immunohistochemistry","journal":"Pflugers Archiv : European journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo behavioral assay corroborated by electrophysiology; single lab","pmids":["35048187"],"is_preprint":false},{"year":2020,"finding":"MITF directly transcriptionally targets SLC7A5; SLC7A5 inhibition or knockdown decreases melanin synthesis in melanocytes and melanoma cells without affecting tyrosinase activity, and acts through a different pathway from kojic acid (a tyrosinase inhibitor), revealing SLC7A5 as a regulator of melanogenesis.","method":"ChIP-seq, microarray, siRNA knockdown, pharmacological inhibition (BCH, JPH203), melanin measurement, tyrosinase activity assay, reconstructed human epidermis model","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq data plus functional siRNA/pharmacological validation; single lab","pmids":["32240722"],"is_preprint":false},{"year":2024,"finding":"ALYREF (m5C reader) binds and stabilizes JunD mRNA via m5C modification; JunD then transcriptionally upregulates SLC7A5, increasing LNAA transport and mTORC1 activation while depleting amino acids in the tumor microenvironment to restrict CD8⁺ T cell function.","method":"m5C RNA-IP, RIP, mRNA stability assay, ChIP, SLC7A5 expression analysis, CD8⁺ T cell functional assay, in vivo tumor model","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple RNA-protein interaction methods and functional validation; single lab","pmids":["38402198"],"is_preprint":false},{"year":2024,"finding":"YAP/TAZ reverses KRAS inhibitor-induced proliferation arrest by activating the SLC7A5/mTORC1 axis; knockdown of YAP/TAZ or TEADs reduces SLC7A5-dependent mTORC1 activity and sensitizes resistant cells to KRAS G12C inhibitors.","method":"Transcriptomic analysis, genetic knockdown (YAP/TAZ/TEAD siRNA), SLC7A5 expression analysis, mTORC1 pathway assay, drug sensitivity assay","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown with pathway readout; single lab","pmids":["39704172"],"is_preprint":false},{"year":2022,"finding":"Alliin (a garlic-derived nutraceutical) is a substrate of LAT1 (SLC7A5), as demonstrated by competitive inhibition and direct transport in proteoliposomes reconstituted with recombinant human LAT1. Computational docking predicted interaction with the substrate binding site, confirmed by functional assay.","method":"Bioinformatics/docking, proteoliposome transport assay with recombinant protein","journal":"Frontiers in pharmacology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution in proteoliposomes; single lab, confirmed by two orthogonal approaches","pmids":["35401172"],"is_preprint":false}],"current_model":"SLC7A5 (LAT1) is a Na⁺- and pH-independent antiporter (with unconventional uniport for some substrates) that forms a heterodimer with CD98/4F2hc (SLC3A2) via a conserved disulfide bond; CD98 is required for plasma membrane routing but not transport activity. LAT1 preferentially transports large neutral amino acids and histidine, and also accepts pharmacological substrates (gabapentin, pregabalin, melphalan) and metabolic inputs (citrulline under arginine limitation, copper-histidinate). Key substrate-binding residues (F252, S342, C335) and regulatory sites (C407 for covalent inhibitors; K204 for ATP modulation; K19/K25/K30 for Nedd4-2-mediated ubiquitylation and endocytosis) have been defined by mutagenesis. Transport activity is positively modulated by cholesterol (which increases Vmax) and synergistically by ATP. Transcriptionally, SLC7A5 is induced by HIF-2α (which binds its proximal promoter under hypoxia), Wnt/β-catenin signaling, c-Myc/SRC2, and multiple other oncogenic inputs, and is repressed by glucocorticoid receptor-mediated transrepression. By importing leucine and other LNAAs, SLC7A5 activates mTORC1 signaling in diverse cell types (muscle, neurons, immune cells, cancer cells), supporting protein synthesis, proliferation, and metabolic reprogramming; it additionally promotes tryptophan-driven de novo NAD⁺ synthesis to amplify glycolysis. SLC7A5 also physically interacts with and modulates voltage-gated potassium channels Kv1.1 and Kv1.2, profoundly shifting their gating and suppressing their currents."},"narrative":{"mechanistic_narrative":"SLC7A5 (LAT1) is the catalytic light chain of a heterodimeric large-neutral-amino-acid transporter that couples nutrient import to anabolic signaling across muscle, neurons, immune cells, epithelia, and tumors [PMID:9837878, PMID:24586861]. It associates with the CD98/4F2hc glycoprotein (SLC3A2) through a conserved disulfide bond; reconstitution of recombinant LAT1 in proteoliposomes shows it functions as a Na⁺- and pH-independent antiporter (histidine is a preferred substrate), with CD98 dispensable for transport itself but required for plasma-membrane routing [PMID:29988369]. Substrate recognition and regulation map to discrete residues defined by mutagenesis: F252/S342/C335 form the substrate site, C407 is the attachment point for covalent dithiazole/dithiazine inhibitors, and K204 mediates ATP modulation, while cholesterol raises transport Vmax and ATP acts synergistically to stabilize an inward-open state [PMID:28088504, PMID:28709952, PMID:28272458, PMID:33028978]. Surface levels are controlled post-translationally by PKC/Nedd4-2–dependent ubiquitylation of N-terminal lysines K19/K25/K30, driving endocytosis and degradation [PMID:31728037]. Functionally, leucine and other LNAA influx through SLC7A5 activates mTORC1 to drive protein synthesis, differentiation, and proliferation—demonstrated in skeletal muscle, cerebellar neurons, intestinal secretory cells, B and T lymphocytes, monocytes/macrophages, and KRAS-mutant tumors—with loss of SLC7A5 triggering the integrated stress response and developmental defects in vivo [PMID:31789450, PMID:24586861, PMID:33414552, PMID:32821949, PMID:29422900, PMID:38617535]. Beyond canonical LNAA antiport, SLC7A5 transports pharmacological cargo (gabapentin, pregabalin), citrulline under arginine limitation, and copper-histidinate via an unconventional uniport mechanism, and supports tryptophan-driven NAD⁺ synthesis and glutathione-dependent stress defense [PMID:23567998, PMID:30374619, PMID:37692288, PMID:39756034, PMID:40611146, PMID:33567754]. Transcriptionally it integrates oncogenic and stress inputs including HIF-2α, Wnt/β-catenin, c-Myc/SRC2, MITF, and YAP/TAZ, and is repressed by glucocorticoid-receptor transrepression [PMID:23103253, PMID:31789450, PMID:26094588, PMID:30761250, PMID:37094160, PMID:32240722, PMID:39704172]. Independent of transport, SLC7A5 physically associates with and suppresses voltage-gated potassium channels Kv1.1 and Kv1.2, dramatically shifting their gating [PMID:30356053, PMID:33164746].","teleology":[{"year":1998,"claim":"Establishing that the CD98 light chain is the SLC7A5/E16 protein answered what gives the CD98 antigen its amino-acid-transport activity, unifying an immunology antigen with a transporter.","evidence":"MS peptide sequencing, reciprocal co-IP, and reconstitution of HA-tagged E16 with CD98 heavy chain","pmids":["9837878","10072483"],"confidence":"High","gaps":["Did not define transport mechanism or substrate selectivity","Did not establish whether CD98 is required for activity versus trafficking"]},{"year":2018,"claim":"Reconstitution of recombinant LAT1 in proteoliposomes settled the transport mode—Na⁺/pH-independent antiport with CD98 needed only for membrane routing, not catalysis.","evidence":"Proteoliposome radiolabeled transport assays with recombinant human LAT1 and site-directed mutagenesis","pmids":["29988369"],"confidence":"High","gaps":["Did not resolve full physiological substrate hierarchy in cells","Structural basis of antiport conformational cycle not defined"]},{"year":2017,"claim":"Mutagenesis pinpointed the substrate-binding residues and a druggable cysteine, converting a black-box carrier into a defined pharmacological target.","evidence":"Proteoliposome transport with F252/S342/C335/C407 mutants, chemical modification, and C407A covalent-inhibitor rescue","pmids":["28088504","28709952"],"confidence":"High","gaps":["No high-resolution structure of inhibitor-bound transporter in these studies","Selectivity of covalent inhibitors across SLC7 family not established"]},{"year":2017,"claim":"Identifying cholesterol and ATP as positive modulators (Vmax increase; K204-dependent ATP synergy) revealed that LAT1 activity is tuned by membrane and energetic state, not just substrate supply.","evidence":"Cholesterol-depletion uptake assays, purification with cholesterol analogue, and K204Q mutagenesis with docking","pmids":["28272458","33028978"],"confidence":"High","gaps":["Physiological relevance of ATP modulation in intact cells untested","How cholesterol stabilizes the conformational state structurally unknown"]},{"year":2019,"claim":"Mapping PKC/Nedd4-2–dependent ubiquitylation of K19/K25/K30 explained how surface LAT1 levels are acutely downregulated, linking signaling to transporter turnover.","evidence":"Endocytosis and ubiquitylation assays, Nedd4-2 siRNA, and systematic lysine mutagenesis in HeLa","pmids":["31728037"],"confidence":"High","gaps":["Physiological triggers of Nedd4-2 recruitment beyond PMA not defined","Whether other E3 ligases regulate LAT1 in vivo unaddressed"]},{"year":2014,"claim":"Tissue-specific knockouts established that SLC7A5 is genuinely required for LNAA-driven mTOR-S6K signaling rather than redundant, first shown in skeletal muscle.","evidence":"MCK-Cre conditional knockout with leucine challenge and S6K Thr389 phospho-readout in vivo","pmids":["24586861"],"confidence":"High","gaps":["Did not address non-muscle tissues","Contribution relative to other LNAA transporters not quantified"]},{"year":2018,"claim":"CRISPR knockout of ASCT2 versus LAT1 directly tested and refuted the proposed ASCT2→LAT1 exchange-coupling model for mTORC1 activation, sharpening the mechanistic picture.","evidence":"CRISPR-Cas9 knockout of ASCT2 or LAT1 with uptake, mTORC1, and GCN2 pathway readouts in cancer lines","pmids":["29326164"],"confidence":"High","gaps":["Did not identify the antiport counter-substrate sustaining LAT1 import in cells","Tested in limited cell contexts"]},{"year":2020,"claim":"In vivo knockdown with Rheb rescue across neuronal, embryonic, intestinal, and tumor systems placed SLC7A5 firmly upstream of mTORC1 in development and disease.","evidence":"Conditional knockouts/electroporation knockdown with phospho-mTOR readouts, integrated stress response, and constitutively active Rheb rescue","pmids":["32821949","31789450","33414552","38617535"],"confidence":"High","gaps":["Whether SLC7A5 signals to mTORC1 solely via leucine sensing (Sestrin2) not resolved here","Tissue-specific downstream effectors differ and are incompletely mapped"]},{"year":2018,"claim":"Demonstrating leucine-influx–dependent mTORC1 activation in monocytes, B cells, and T cells extended SLC7A5 from anabolic support to control of immune effector programs and glycolytic reprogramming.","evidence":"siRNA/pharmacological inhibition with ECAR, cytokine, plasmablast, and proliferation readouts; SRC2/c-Myc rescue in CD4⁺ T cells","pmids":["29422900","30092695","37094160"],"confidence":"Medium","gaps":["Quantitative contribution of LAT1 versus other transporters to immune metabolism unclear","Several findings rest on single-lab functional inhibition"]},{"year":2018,"claim":"An unbiased interactome screen plus electrophysiology revealed a transport-independent role: SLC7A5 binds and profoundly suppresses Kv1.1/Kv1.2 channel gating, connecting it to neuronal excitability and channelopathy.","evidence":"MS interactome, heterologous co-expression, chimeric-channel and whole-cell patch clamp, disease-mutation validation","pmids":["30356053","33164746","32311044"],"confidence":"High","gaps":["Structural basis of the SLC7A5–Kv interaction unresolved","Physiological significance in native neurons not fully established"]},{"year":2023,"claim":"Substrate-expansion studies showed LAT1 carries drugs and non-canonical cargo (gabapentin, pregabalin, citrulline, copper-histidinate via uniport), redefining its physiological and pharmacological scope.","evidence":"Kinetic uptake in cell lines, isotope tracing, proteoliposome transport, MS, and crystallography of the Cu(His)₂ complex","pmids":["23567998","30374619","27","37692288","39756034"],"confidence":"High","gaps":["Quantitative in vivo contribution of unconventional uniport unknown","Whether other metal-amino-acid complexes are physiological substrates untested"]},{"year":2024,"claim":"Transcriptional and post-transcriptional regulators (HIF-2α, Wnt/β-catenin, c-Myc/SRC2, MITF, YAP/TAZ, GR, IGF2BP2/m6A, ALYREF, TRIM35) were mapped, showing SLC7A5 as a convergent node downstream of oncogenic, hypoxic, and hormonal signaling.","evidence":"ChIP/ChIP-seq, reporter assays, RIP/MeRIP, ubiquitination assays, and knockdown/rescue across multiple cell systems","pmids":["23103253","30761250","31618","26094588","37094160","32240722","39704172","38281999","38402198","39304904"],"confidence":"Medium","gaps":["Most regulatory axes shown in single labs/contexts","Hierarchy and crosstalk among these inputs not integrated"]},{"year":null,"claim":"How the transport-dependent mTORC1 role and the transport-independent Kv channel modulation are integrated within a single cell, and the in vivo physiological weight of unconventional substrates, remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure capturing both substrate transport and Kv binding","Counter-substrate sustaining cellular antiport import unidentified","Relative physiological importance of LNAA versus drug/metal/citrulline transport unquantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[2,3,17,18,27,29]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[2,10,27]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[14,15,16]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,7]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[2,3,17,18,29]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,10,11,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[13,24,25]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[14,15]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[29,30,33]}],"complexes":["LAT1/CD98 (SLC7A5–SLC3A2) heterodimeric amino acid transporter"],"partners":["SLC3A2","KCNA1","KCNA2","NEDD4L","TRIM35","IGF2BP2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q01650","full_name":"Large neutral amino acids transporter small subunit 1","aliases":["4F2 light chain","4F2 LC","4F2LC","CD98 light chain","Integral membrane protein E16","E16","L-type amino acid transporter 1","hLAT1","Solute carrier family 7 member 5","y+ system cationic amino acid transporter"],"length_aa":507,"mass_kda":55.0,"function":"The heterodimer with SLC3A2 functions as a sodium-independent, high-affinity transporter that mediates uptake of large neutral amino acids such as phenylalanine, tyrosine, leucine, histidine, methionine, tryptophan, valine, isoleucine and alanine (PubMed:10049700, PubMed:10574970, PubMed:11557028, PubMed:11564694, PubMed:12117417, PubMed:12225859, PubMed:15769744, PubMed:18262359, PubMed:25998567, PubMed:30867591, PubMed:9751058). The heterodimer with SLC3A2 mediates the uptake of L-DOPA (By similarity). Functions as an amino acid exchanger (PubMed:11557028, PubMed:12117417, PubMed:12225859, PubMed:30867591). May play a role in the transport of L-DOPA across the blood-brain barrier (By similarity). May act as the major transporter of tyrosine in fibroblasts (Probable). May mediate blood-to-retina L-leucine transport across the inner blood-retinal barrier (By similarity). Can mediate the transport of thyroid hormones diiodothyronine (T2), triiodothyronine (T3) and thyroxine (T4) across the cell membrane (PubMed:11564694). When associated with LAPTM4B, the heterodimer formed by SLC3A2 and SLC7A5 is recruited to lysosomes to promote leucine uptake into these organelles, and thereby mediates mTORC1 activation (PubMed:25998567). Involved in the uptake of toxic methylmercury (MeHg) when administered as the L-cysteine or D,L-homocysteine complexes (PubMed:12117417). Involved in the cellular activity of small molecular weight nitrosothiols, via the stereoselective transport of L-nitrosocysteine (L-CNSO) across the membrane (PubMed:15769744) (Microbial infection) In case of hepatitis C virus/HCV infection, the complex formed by SLC3A2 and SLC7A5/LAT1 plays a role in HCV propagation by facilitating viral entry into host cell and increasing L-leucine uptake-mediated mTORC1 signaling activation, thereby contributing to HCV-mediated pathogenesis","subcellular_location":"Apical cell membrane; Cell membrane; Lysosome membrane","url":"https://www.uniprot.org/uniprotkb/Q01650/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLC7A5","classification":"Not Classified","n_dependent_lines":322,"n_total_lines":1208,"dependency_fraction":0.26655629139072845},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000103257","cell_line_id":"CID001373","localizations":[{"compartment":"membrane","grade":3},{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"NDRG1","stoichiometry":10.0},{"gene":"NEFM","stoichiometry":10.0},{"gene":"ATP1B3","stoichiometry":0.2},{"gene":"SLC3A2","stoichiometry":0.2},{"gene":"ATP1A1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001373","total_profiled":1310},"omim":[{"mim_id":"618483","title":"LLGL SCRIBBLE CELL POLARITY COMPLEX COMPONENT 2; LLGL2","url":"https://www.omim.org/entry/618483"},{"mim_id":"617256","title":"SOLUTE CARRIER FAMILY 7, MEMBER 13; SLC7A13","url":"https://www.omim.org/entry/617256"},{"mim_id":"614923","title":"BRANCHED-CHAIN KETO ACID DEHYDROGENASE KINASE DEFICIENCY; BCKDKD","url":"https://www.omim.org/entry/614923"},{"mim_id":"612525","title":"PYLORIC STENOSIS, INFANTILE HYPERTROPHIC, 5; IHPS5","url":"https://www.omim.org/entry/612525"},{"mim_id":"604735","title":"UBIQUITIN-SPECIFIC PROTEASE 16; USP16","url":"https://www.omim.org/entry/604735"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":104.4},{"tissue":"esophagus","ntpm":96.2}],"url":"https://www.proteinatlas.org/search/SLC7A5"},"hgnc":{"alias_symbol":["LAT1","E16","D16S469E","MPE16","CD98"],"prev_symbol":[]},"alphafold":{"accession":"Q01650","domains":[{"cath_id":"1.20.1740.10","chopping":"53-501","consensus_level":"medium","plddt":89.7222,"start":53,"end":501}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q01650","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q01650-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q01650-F1-predicted_aligned_error_v6.png","plddt_mean":85.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLC7A5","jax_strain_url":"https://www.jax.org/strain/search?query=SLC7A5"},"sequence":{"accession":"Q01650","fasta_url":"https://rest.uniprot.org/uniprotkb/Q01650.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q01650/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q01650"}},"corpus_meta":[{"pmid":"29988369","id":"PMC_29988369","title":"The 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The CD98LC/SLC7A5 protein was co-purified with the CD98 heavy chain from HeLa cells.\",\n      \"method\": \"Affinity purification, N-terminal protein sequencing, cDNA cloning, FISH\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein purification and sequence confirmed identity; single lab\",\n      \"pmids\": [\"10072483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SLC7A5 (LAT1) forms a heterodimeric amino acid transporter with the glycoprotein CD98 (SLC3A2) through a conserved disulfide bond; in proteoliposomes reconstituted with recombinant human LAT1, transport is Na⁺- and pH-independent antiport; the preferred substrate is histidine; CD98 is not required for transport activity and is instead involved in routing LAT1 to the plasma membrane.\",\n      \"method\": \"Proteoliposome reconstitution with recombinant protein, radiolabeled transport assay, site-directed mutagenesis\",\n      \"journal\": \"Frontiers in chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution in proteoliposomes with recombinant protein, replicated across multiple studies reviewed in the paper\",\n      \"pmids\": [\"29988369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Residues F252, S342, and C335 are crucial for substrate recognition in LAT1 (SLC7A5); C407 plays a minor role. The transporter preferentially adopts a dimeric structure and catalyzes antiport following a simultaneous random mechanism. K⁺ has regulatory properties on LAT1 similar to LeuT.\",\n      \"method\": \"Site-directed mutagenesis, chemical modification, transport assay in proteoliposomes, bioinformatics\",\n      \"journal\": \"Biochimica et biophysica acta. General subjects\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and functional assay; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"28088504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cysteine residue C407 in the substrate binding site of LAT1 (SLC7A5) forms a covalent disulfide bond with dithiazole/dithiazine inhibitors, confirmed by loss of inhibition in the C407A mutant and reversal of inhibition by dithioerythritol. These covalent inhibitors show IC50 <1 µM and cause cell death in SLC7A5-expressing cancer cells.\",\n      \"method\": \"Proteoliposome transport assay, site-directed mutagenesis (C407A), molecular docking, cell viability assay\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution, mutagenesis, and functional rescue in a single rigorous study\",\n      \"pmids\": [\"28709952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cholesterol depletion reduces the Vmax but not the Km of LAT1-mediated transport, indicating cholesterol modulates transporter activity by stabilizing a specific conformational state. A soluble cholesterol analogue was required for stable purification of the LAT1/CD98 complex with retained substrate-binding activity.\",\n      \"method\": \"Cellular uptake assay with cholesterol depletion, protein purification with cholesterol analogue, substrate binding assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional uptake assay plus purification; single lab, two methods\",\n      \"pmids\": [\"28272458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ATP synergistically stimulates LAT1 (SLC7A5) transport activity in the presence of cholesterol, selectively increasing substrate affinity at the internal site (suggesting stabilization of inward-open conformation). Computational docking and site-directed mutagenesis identified Lys204 as the ATP interaction residue; the K204Q mutant showed impaired function and abolished ATP response.\",\n      \"method\": \"Proteoliposome transport assay, computational docking, site-directed mutagenesis (K204Q)\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and structural modeling in one study; single lab\",\n      \"pmids\": [\"33028978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PKC activation by PMA triggers efficient endocytosis and degradation of LAT1 (SLC7A5) in HeLa cells, mediated by Nedd4-2 ubiquitin ligase. Systematic mutagenesis identified three lysines (K19, K25, K30) in the N-terminal cytosolic tail as required for PMA-induced ubiquitylation and downregulation.\",\n      \"method\": \"Endocytosis assay, ubiquitylation assay, Nedd4-2 siRNA knockdown, systematic lysine mutagenesis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO-knockdown with defined cellular phenotype plus systematic mutagenesis; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"31728037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HIF2α activates mTORC1 by transcriptionally upregulating SLC7A5 expression; HIF2α binds directly to the Slc7a5 proximal promoter. This pathway links oxygen sensing to mTORC1 activation and accounts for tumor-promoting properties of HIF2α in VHL-deficient cells.\",\n      \"method\": \"Reporter assay, chromatin immunoprecipitation (ChIP), genetic overexpression/knockdown, mTORC1 activity assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct promoter binding plus functional mTORC1 readout; replicated in multiple cell contexts (liver, lung, VHL-deficient cells)\",\n      \"pmids\": [\"23103253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Wnt/β-catenin signaling directly supports Slc7a5 expression; loss of Wnt/β-catenin inhibits Slc7a5 and induces the integrated stress response (aberrant mTORC1 activity, increased apoptosis). Slc7a5-null mouse embryos display profound neural and limb bud outgrowth defects accompanied by induction of the integrated stress response.\",\n      \"method\": \"Slc7a5-null mouse embryo analysis, transcriptomics, phosphoprotein analysis, apoptosis assay, genetic epistasis with Wnt pathway mutants\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout with multiple orthogonal readouts (transcriptomics, phosphorylation, apoptosis) and genetic epistasis\",\n      \"pmids\": [\"31789450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Muscle-specific knockout of Slc7a5 blunts leucine-induced mTOR-S6K (Thr389) phosphorylation in skeletal muscle in vivo, and reduces intramuscular leucine/isoleucine concentrations and S6K activity on low-protein diets, demonstrating that SLC7A5 is required for LNAA-dependent mTOR-S6K pathway activation in skeletal muscle.\",\n      \"method\": \"Conditional Cre-lox knockout (MCK-Cre), intraperitoneal leucine injection, phosphoprotein analysis (S6K Thr389), amino acid measurement\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with clean physiological and biochemical phenotypic readout in vivo\",\n      \"pmids\": [\"24586861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SLC7A5 is critical for KRAS-mutant colorectal cancer growth; mechanistically it maintains intracellular amino acid levels after KRAS activation to support increased bulk protein synthesis. Combined deletion of Slc7a5 and mTORC1 inhibition abrogates established Kras-mutant tumor growth.\",\n      \"method\": \"Conditional mouse knockout, metabolic tracing, protein synthesis assay, tumor growth assay, genetic epistasis with mTORC1 pathway\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional knockout in disease model with multiple orthogonal metabolic and functional readouts\",\n      \"pmids\": [\"33414552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Slc7a5 knockdown in cerebellar granule cell precursors reduces mTOR pathway activity and impairs late-phase granule cell dendrite maturation and survival; these defects are rescued by constitutively active Rheb (an mTOR activator), placing SLC7A5 upstream of mTOR in neuronal development.\",\n      \"method\": \"In vivo electroporation-based knockdown, mTOR pathway phosphorylation assay, morphological analysis, genetic rescue with Rheb\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockdown with genetic rescue demonstrating epistasis to mTOR; multiple readouts\",\n      \"pmids\": [\"32821949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SLC7A5-mediated leucine influx activates mTORC1 and drives pro-inflammatory cytokine (IL-1β) production and glycolytic reprogramming in activated human monocytes/macrophages; pharmacological blockade or silencing of SLC7A5 reduces mTORC1 activity, glycolysis (measured as ECAR), and IL-1β production.\",\n      \"method\": \"siRNA knockdown, pharmacological inhibition, mTORC1 activity assay, metabolic flux (ECAR), cytokine measurement\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with defined metabolic phenotype; single lab, two orthogonal methods\",\n      \"pmids\": [\"29422900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Slc7a5 co-expression with Kv1.2 dramatically hyperpolarizes the voltage-dependence of Kv1.2 activation by ~47 mV, reduces total Kv1.2 protein, and accelerates inactivation; these effects are attenuated by co-expression of Slc3a2. Disease-linked Slc7a5 mutations show a localization defect and attenuated effects on Kv1.2. Epilepsy-linked gain-of-function Kv1.2 mutants show enhanced sensitivity to Slc7a5.\",\n      \"method\": \"Mass spectrometry interactome screen, co-expression in heterologous system, whole-cell electrophysiology, Western blot, immunofluorescence\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — identified via unbiased MS screen, followed by electrophysiology and protein expression; multiple orthogonal methods; disease mutation validation\",\n      \"pmids\": [\"30356053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Slc7a5 regulates Kv1.1 channels by inhibiting channel activity; this inhibition can be reversed by supraphysiological hyperpolarization. Exchange of the voltage-sensing domain between Kv1.1 and Kv1.2 controls Slc7a5 sensitivity, and a specific position in the S1 segment is a major determinant of Slc7a5 modulation.\",\n      \"method\": \"Knockdown of endogenous Slc7a5, chimeric channel electrophysiology, heterologous expression, whole-cell patch clamp\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — channel chimeras plus knockdown with defined electrophysiological readouts; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"33164746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Slc7a5-mediated current suppression of Kv1.2 is attenuated when Kvβ1.2 is co-expressed; however, gating shifts and modified inactivation properties from both Slc7a5 and Kvβ are additive, demonstrating convergent but independent regulation of Kv1.2 by the two accessory proteins.\",\n      \"method\": \"Co-expression in heterologous system, whole-cell electrophysiology, Western blot\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional electrophysiology with defined mechanistic conclusions; single lab\",\n      \"pmids\": [\"32311044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Gabapentin is a substrate of LAT1 (SLC7A5); Km values of 530 µM (in brain endothelial cells) and 217 µM (in LAT1-transfected HEK293 cells) were determined by kinetic analysis. LAT1-mediated transport was 3–10-fold higher than other transport processes at physiological concentrations.\",\n      \"method\": \"Radiolabeled uptake assay, siRNA knockdown, LAT1 overexpression in HEK293 cells, Michaelis-Menten kinetics, mathematical modelling\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — kinetic characterization in two independent cell systems with siRNA and overexpression; multiple orthogonal approaches\",\n      \"pmids\": [\"23567998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LAT1 (SLC7A5) transports pregabalin; overexpression of LAT1 but not LAT2 in HEK293 cells increases pregabalin uptake with Km of 0.288 mM. LAT1 siRNA knockdown in hCMEC/D3 cells reduces pregabalin uptake by 75%.\",\n      \"method\": \"Transporter overexpression in HEK293, LC-MS/MS uptake assay, siRNA knockdown, competitive inhibition assay\",\n      \"journal\": \"Pharmaceutical research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function overexpression and loss-of-function knockdown with kinetic characterization; multiple orthogonal approaches\",\n      \"pmids\": [\"30374619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Dexamethasone downregulates SLC7A5 expression via glucocorticoid receptor (GR)-mediated transrepression; GR binds the proximal promoter of SLC7A5. The resulting reduction in amino acid uptake inhibits mTOR signaling, causing G1/S cell cycle arrest, enhanced autophagy and apoptosis in BeWo placental cells. The GR antagonist RU486 abolishes these effects.\",\n      \"method\": \"ChIP, reporter assay (GR nuclear translocation), siRNA knockdown of SLC7A5, mTOR pathway analysis, cell cycle analysis, GR antagonist treatment\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct GR binding at SLC7A5 promoter; pharmacological rescue; multiple orthogonal functional readouts\",\n      \"pmids\": [\"26094588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Hypoxia upregulates Slc7a5 expression in differentiated neuronal cells through HIF-2α, which binds directly to the proximal promoter of Slc7a5. shRNA knockdown of HIF-2α (but not HIF-1α) markedly reduces hypoxia-induced Slc7a5 upregulation.\",\n      \"method\": \"ChIP, shRNA knockdown of HIF-2α and HIF-1α, qRT-PCR\",\n      \"journal\": \"FEBS open bio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus isoform-specific knockdown; single lab\",\n      \"pmids\": [\"30761250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Insulin (0.5 nmol/L) increases SLC7A5/LAT1 mRNA abundance in C2C12 myotubes via an mTORC1-dependent mechanism; both low and high doses of rapamycin prevent this induction, placing SLC7A5 regulation downstream of mTORC1.\",\n      \"method\": \"mTORC1 inhibition with rapamycin, phosphoprotein analysis (S6K1, S6), mRNA quantification (qRT-PCR)\",\n      \"journal\": \"Physiological reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological epistasis with dose-response; single lab\",\n      \"pmids\": [\"24760501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"miR-126 directly targets SLC7A5; siRNA-mediated suppression of SLC7A5 phenocopies miR-126 overexpression (G1 delay, proliferation inhibition) in H69 small cell lung cancer cells.\",\n      \"method\": \"miRNA overexpression, siRNA knockdown, cell cycle analysis, proliferation assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct target validation by phenocopy with siRNA; single lab\",\n      \"pmids\": [\"21439283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ASCT2 (SLC1A5) knockout significantly reduces glutamine import but does not affect leucine uptake via LAT1, and does not alter mTORC1 activity or the GCN2/EIF2a/ATF4 amino acid stress response, contrary to the proposed functional coupling model of ASCT2 feeding LAT1-mediated mTORC1 activation.\",\n      \"method\": \"CRISPR-Cas9 knockout of ASCT2 or LAT1, amino acid uptake assay, mTORC1 activity assay (S6K1/S6), GCN2 pathway analysis, tumor growth assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean CRISPR KO in two cancer cell lines with multiple orthogonal biochemical readouts; directly tests and negates a prior mechanistic model\",\n      \"pmids\": [\"29326164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SRC2 (steroid nuclear receptor coactivator 2) co-activates c-Myc to stimulate Slc7a5 expression in CD4⁺ T cells; SRC2-deficient T cells fail to upregulate Slc7a5, and forced expression of Slc7a5 rescues proliferation, cytokine production, and the ability to induce EAE.\",\n      \"method\": \"Conditional T cell-specific knockout, forced gene expression rescue, in vitro and in vivo functional assays (proliferation, cytokine production), adoptive transfer\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue experiment places SRC2/c-Myc/Slc7a5 in a linear pathway; multiple in vitro and in vivo functional readouts\",\n      \"pmids\": [\"37094160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"l-Leucine influx through Slc7a5 is required for mTORC1 activation, plasmablast differentiation, and production of IgG and inflammatory cytokines in CpG-stimulated human B cells. CpG stimulation induces Slc7a5 expression and leucine uptake; Slc7a5 inhibition abrogates these responses.\",\n      \"method\": \"RT-PCR, flow cytometry, radioisotope uptake assay, pharmacological inhibition, mTORC1 activity assay\",\n      \"journal\": \"Modern rheumatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional inhibition with multiple downstream readouts; single lab\",\n      \"pmids\": [\"30092695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM35 E3 ubiquitin ligase interacts with, ubiquitinates, and upregulates the amino acid transporter SLC7A5 in cardiac fibroblasts, enhancing amino acid transport and mTORC1 activation. Overexpression of SLC7A5 reverses the reduced cardiac fibrosis caused by TRIM35 conditional knockout.\",\n      \"method\": \"LC-MS/MS, co-immunoprecipitation, ubiquitination assay, conditional knockout in mice, SLC7A5 rescue overexpression, mTORC1 activity assay\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ubiquitination assay with in vivo rescue; single lab\",\n      \"pmids\": [\"39304904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LAT1 (SLC7A5) transports copper(II)-histidinate [Cu(His)₂] via an unconventional uniport mechanism, distinct from its canonical antiport of amino acids. Site-directed mutagenesis, radiolabeled transport assays, mass spectrometry, and crystal structure of the Cu(His)₂ complex confirmed transport and identified the binding interaction.\",\n      \"method\": \"Bioinformatics, site-directed mutagenesis, radiolabeled transport assay, mass spectrometry, crystallography of substrate complex\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, MS, and structural characterization of the substrate complex; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"37692288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SLC7A5 (LAT1) is required for normal secretory cell differentiation in mouse intestinal epithelium; intestinal epithelial cell-specific knockout reduces mTORC1 signaling, causes dedifferentiation of Paneth cells (with loss of secretory granules), and alters goblet cell distribution, resulting in indirect increases in crypt cell proliferation.\",\n      \"method\": \"IEC-specific conditional knockout (Slc7a5ΔIEC), scRNA-seq, electron microscopy, mTORC1 pathway analysis\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional in vivo knockout with multiple orthogonal readouts (scRNA-seq, EM, biochemistry)\",\n      \"pmids\": [\"38617535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SLC7A5 functions as a citrulline transporter under arginine-limited conditions; isotope tracing shows citrulline uptake and conversion to arginine are dependent on SLC7A5 expression. Loss of SLC7A5 reduces tumor growth and citrulline import in a mouse tumor model.\",\n      \"method\": \"CRISPR-Cas9 functional screen, isotope tracing (citrulline metabolism), pharmacological inhibition, mouse tumor model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isotope tracing demonstrates substrate transport in a clean KO background; confirmed in vivo\",\n      \"pmids\": [\"39756034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LAT1 (SLC7A5) promotes TNBC progression and chemoresistance by facilitating L-tryptophan uptake and upregulating QPRT (rate-limiting enzyme in de novo NAD⁺ synthesis), increasing the cytosolic NAD⁺/NADH ratio, which enhances phosphorylation of PKM2 and LDHA to amplify glycolysis.\",\n      \"method\": \"LAT1 knockdown and pharmacological inhibition, steady-state polar metabolite profiling (LC-MS), pyruvate/lactate assay, Seahorse metabolic assay, in vivo orthotopic and PDX mouse models\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — metabolite profiling plus functional assays link LAT1 to tryptophan/NAD⁺ axis; single lab\",\n      \"pmids\": [\"40611146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IGF2BP2 enhances SLC7A5 mRNA stability and translation through m6A modification; SLC7A5-mediated methionine transport supports S-adenosylmethionine production, which increases H3K4me3 at the IGF2BP2 promoter to form a positive feedback loop. FBW7/GSK3β ubiquitinate and degrade IGF2BP2 to break this loop.\",\n      \"method\": \"ChIP-qPCR, RIP, MeRIP-qPCR, RNA pull-down, co-immunoprecipitation, ubiquitination assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple RNA-protein interaction methods; single lab\",\n      \"pmids\": [\"38281999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Diesel exhaust particle extract induces LAT1 (SLC7A5)/CD98hc expression and LAT1-mediated leucine transport in bronchial epithelial cells via the aryl hydrocarbon receptor (AhR) pathway; AhR antagonist or AhR siRNA prevents this induction. CD98hc induction subsequently activates the integrin/FAK/ERK signaling pathway, upregulating MMP-2.\",\n      \"method\": \"Chemical AhR antagonist, siRNA knockdown of AhR, mRNA and protein expression analysis, leucine accumulation assay, MMP-2 activity assay\",\n      \"journal\": \"Toxicology and applied pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis plus pharmacological inhibition; single lab\",\n      \"pmids\": [\"26621329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SLC7A5 (LAT1) mediates methylmercury-L-cysteine conjugate uptake in placental cells; LAT1-depleted HTR-8/SVneo cells accumulate less MeHg but are more susceptible to MeHg toxicity due to lower glutathione (GSH) levels, demonstrating that LAT1-mediated amino acid transport is essential for de novo GSH synthesis and oxidative stress defense.\",\n      \"method\": \"siRNA knockdown of LAT1, MeHg uptake measurement, cell viability, apoptosis, oxidative stress assays, GSH measurement\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean siRNA KD with mechanistic linkage to GSH; single lab\",\n      \"pmids\": [\"33567754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SLC7A5 (LAT1) is required for normal myoblast viability, differentiation, and fusion; pharmacological inhibition and genetic knockdown both impair these processes. LAT1 expression decreases during myotube differentiation and is reduced under atrophic conditions in vitro.\",\n      \"method\": \"Pharmacological inhibition, genetic knockdown (siRNA), myogenesis assays (viability, differentiation, fusion), Western blot\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — parallel pharmacological and genetic approaches; single lab\",\n      \"pmids\": [\"35848618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Intrathecal administration of the LAT1 (SLC7A5) inhibitor JPH203 alleviates allodynia in the spared nerve injury mouse model of neuropathic pain. JPH203 treatment reduces excitability of small-diameter DRG neurons from SNI mice and affects tetrodotoxin-resistant sodium currents in naive rat DRG neurons.\",\n      \"method\": \"Intrathecal drug administration, behavioral assay (allodynia), whole-cell electrophysiology (current-clamp and voltage-clamp), Western blot, immunohistochemistry\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo behavioral assay corroborated by electrophysiology; single lab\",\n      \"pmids\": [\"35048187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MITF directly transcriptionally targets SLC7A5; SLC7A5 inhibition or knockdown decreases melanin synthesis in melanocytes and melanoma cells without affecting tyrosinase activity, and acts through a different pathway from kojic acid (a tyrosinase inhibitor), revealing SLC7A5 as a regulator of melanogenesis.\",\n      \"method\": \"ChIP-seq, microarray, siRNA knockdown, pharmacological inhibition (BCH, JPH203), melanin measurement, tyrosinase activity assay, reconstructed human epidermis model\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq data plus functional siRNA/pharmacological validation; single lab\",\n      \"pmids\": [\"32240722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ALYREF (m5C reader) binds and stabilizes JunD mRNA via m5C modification; JunD then transcriptionally upregulates SLC7A5, increasing LNAA transport and mTORC1 activation while depleting amino acids in the tumor microenvironment to restrict CD8⁺ T cell function.\",\n      \"method\": \"m5C RNA-IP, RIP, mRNA stability assay, ChIP, SLC7A5 expression analysis, CD8⁺ T cell functional assay, in vivo tumor model\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple RNA-protein interaction methods and functional validation; single lab\",\n      \"pmids\": [\"38402198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"YAP/TAZ reverses KRAS inhibitor-induced proliferation arrest by activating the SLC7A5/mTORC1 axis; knockdown of YAP/TAZ or TEADs reduces SLC7A5-dependent mTORC1 activity and sensitizes resistant cells to KRAS G12C inhibitors.\",\n      \"method\": \"Transcriptomic analysis, genetic knockdown (YAP/TAZ/TEAD siRNA), SLC7A5 expression analysis, mTORC1 pathway assay, drug sensitivity assay\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown with pathway readout; single lab\",\n      \"pmids\": [\"39704172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Alliin (a garlic-derived nutraceutical) is a substrate of LAT1 (SLC7A5), as demonstrated by competitive inhibition and direct transport in proteoliposomes reconstituted with recombinant human LAT1. Computational docking predicted interaction with the substrate binding site, confirmed by functional assay.\",\n      \"method\": \"Bioinformatics/docking, proteoliposome transport assay with recombinant protein\",\n      \"journal\": \"Frontiers in pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution in proteoliposomes; single lab, confirmed by two orthogonal approaches\",\n      \"pmids\": [\"35401172\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLC7A5 (LAT1) is a Na⁺- and pH-independent antiporter (with unconventional uniport for some substrates) that forms a heterodimer with CD98/4F2hc (SLC3A2) via a conserved disulfide bond; CD98 is required for plasma membrane routing but not transport activity. LAT1 preferentially transports large neutral amino acids and histidine, and also accepts pharmacological substrates (gabapentin, pregabalin, melphalan) and metabolic inputs (citrulline under arginine limitation, copper-histidinate). Key substrate-binding residues (F252, S342, C335) and regulatory sites (C407 for covalent inhibitors; K204 for ATP modulation; K19/K25/K30 for Nedd4-2-mediated ubiquitylation and endocytosis) have been defined by mutagenesis. Transport activity is positively modulated by cholesterol (which increases Vmax) and synergistically by ATP. Transcriptionally, SLC7A5 is induced by HIF-2α (which binds its proximal promoter under hypoxia), Wnt/β-catenin signaling, c-Myc/SRC2, and multiple other oncogenic inputs, and is repressed by glucocorticoid receptor-mediated transrepression. By importing leucine and other LNAAs, SLC7A5 activates mTORC1 signaling in diverse cell types (muscle, neurons, immune cells, cancer cells), supporting protein synthesis, proliferation, and metabolic reprogramming; it additionally promotes tryptophan-driven de novo NAD⁺ synthesis to amplify glycolysis. SLC7A5 also physically interacts with and modulates voltage-gated potassium channels Kv1.1 and Kv1.2, profoundly shifting their gating and suppressing their currents.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SLC7A5 (LAT1) is the catalytic light chain of a heterodimeric large-neutral-amino-acid transporter that couples nutrient import to anabolic signaling across muscle, neurons, immune cells, epithelia, and tumors [#0, #10]. It associates with the CD98/4F2hc glycoprotein (SLC3A2) through a conserved disulfide bond; reconstitution of recombinant LAT1 in proteoliposomes shows it functions as a Na\\u207a- and pH-independent antiporter (histidine is a preferred substrate), with CD98 dispensable for transport itself but required for plasma-membrane routing [#2]. Substrate recognition and regulation map to discrete residues defined by mutagenesis: F252/S342/C335 form the substrate site, C407 is the attachment point for covalent dithiazole/dithiazine inhibitors, and K204 mediates ATP modulation, while cholesterol raises transport Vmax and ATP acts synergistically to stabilize an inward-open state [#3, #4, #5, #6]. Surface levels are controlled post-translationally by PKC/Nedd4-2\\u2013dependent ubiquitylation of N-terminal lysines K19/K25/K30, driving endocytosis and degradation [#7]. Functionally, leucine and other LNAA influx through SLC7A5 activates mTORC1 to drive protein synthesis, differentiation, and proliferation\\u2014demonstrated in skeletal muscle, cerebellar neurons, intestinal secretory cells, B and T lymphocytes, monocytes/macrophages, and KRAS-mutant tumors\\u2014with loss of SLC7A5 triggering the integrated stress response and developmental defects in vivo [#9, #10, #11, #12, #13, #28]. Beyond canonical LNAA antiport, SLC7A5 transports pharmacological cargo (gabapentin, pregabalin), citrulline under arginine limitation, and copper-histidinate via an unconventional uniport mechanism, and supports tryptophan-driven NAD\\u207a synthesis and glutathione-dependent stress defense [#17, #18, #27, #29, #30, #33]. Transcriptionally it integrates oncogenic and stress inputs including HIF-2\\u03b1, Wnt/\\u03b2-catenin, c-Myc/SRC2, MITF, and YAP/TAZ, and is repressed by glucocorticoid-receptor transrepression [#8, #9, #19, #20, #24, #36, #38]. Independent of transport, SLC7A5 physically associates with and suppresses voltage-gated potassium channels Kv1.1 and Kv1.2, dramatically shifting their gating [#14, #15].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that the CD98 light chain is the SLC7A5/E16 protein answered what gives the CD98 antigen its amino-acid-transport activity, unifying an immunology antigen with a transporter.\",\n      \"evidence\": \"MS peptide sequencing, reciprocal co-IP, and reconstitution of HA-tagged E16 with CD98 heavy chain\",\n      \"pmids\": [\"9837878\", \"10072483\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define transport mechanism or substrate selectivity\", \"Did not establish whether CD98 is required for activity versus trafficking\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reconstitution of recombinant LAT1 in proteoliposomes settled the transport mode\\u2014Na\\u207a/pH-independent antiport with CD98 needed only for membrane routing, not catalysis.\",\n      \"evidence\": \"Proteoliposome radiolabeled transport assays with recombinant human LAT1 and site-directed mutagenesis\",\n      \"pmids\": [\"29988369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve full physiological substrate hierarchy in cells\", \"Structural basis of antiport conformational cycle not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Mutagenesis pinpointed the substrate-binding residues and a druggable cysteine, converting a black-box carrier into a defined pharmacological target.\",\n      \"evidence\": \"Proteoliposome transport with F252/S342/C335/C407 mutants, chemical modification, and C407A covalent-inhibitor rescue\",\n      \"pmids\": [\"28088504\", \"28709952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of inhibitor-bound transporter in these studies\", \"Selectivity of covalent inhibitors across SLC7 family not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying cholesterol and ATP as positive modulators (Vmax increase; K204-dependent ATP synergy) revealed that LAT1 activity is tuned by membrane and energetic state, not just substrate supply.\",\n      \"evidence\": \"Cholesterol-depletion uptake assays, purification with cholesterol analogue, and K204Q mutagenesis with docking\",\n      \"pmids\": [\"28272458\", \"33028978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of ATP modulation in intact cells untested\", \"How cholesterol stabilizes the conformational state structurally unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapping PKC/Nedd4-2\\u2013dependent ubiquitylation of K19/K25/K30 explained how surface LAT1 levels are acutely downregulated, linking signaling to transporter turnover.\",\n      \"evidence\": \"Endocytosis and ubiquitylation assays, Nedd4-2 siRNA, and systematic lysine mutagenesis in HeLa\",\n      \"pmids\": [\"31728037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological triggers of Nedd4-2 recruitment beyond PMA not defined\", \"Whether other E3 ligases regulate LAT1 in vivo unaddressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Tissue-specific knockouts established that SLC7A5 is genuinely required for LNAA-driven mTOR-S6K signaling rather than redundant, first shown in skeletal muscle.\",\n      \"evidence\": \"MCK-Cre conditional knockout with leucine challenge and S6K Thr389 phospho-readout in vivo\",\n      \"pmids\": [\"24586861\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address non-muscle tissues\", \"Contribution relative to other LNAA transporters not quantified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"CRISPR knockout of ASCT2 versus LAT1 directly tested and refuted the proposed ASCT2\\u2192LAT1 exchange-coupling model for mTORC1 activation, sharpening the mechanistic picture.\",\n      \"evidence\": \"CRISPR-Cas9 knockout of ASCT2 or LAT1 with uptake, mTORC1, and GCN2 pathway readouts in cancer lines\",\n      \"pmids\": [\"29326164\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the antiport counter-substrate sustaining LAT1 import in cells\", \"Tested in limited cell contexts\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"In vivo knockdown with Rheb rescue across neuronal, embryonic, intestinal, and tumor systems placed SLC7A5 firmly upstream of mTORC1 in development and disease.\",\n      \"evidence\": \"Conditional knockouts/electroporation knockdown with phospho-mTOR readouts, integrated stress response, and constitutively active Rheb rescue\",\n      \"pmids\": [\"32821949\", \"31789450\", \"33414552\", \"38617535\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SLC7A5 signals to mTORC1 solely via leucine sensing (Sestrin2) not resolved here\", \"Tissue-specific downstream effectors differ and are incompletely mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating leucine-influx\\u2013dependent mTORC1 activation in monocytes, B cells, and T cells extended SLC7A5 from anabolic support to control of immune effector programs and glycolytic reprogramming.\",\n      \"evidence\": \"siRNA/pharmacological inhibition with ECAR, cytokine, plasmablast, and proliferation readouts; SRC2/c-Myc rescue in CD4\\u207a T cells\",\n      \"pmids\": [\"29422900\", \"30092695\", \"37094160\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of LAT1 versus other transporters to immune metabolism unclear\", \"Several findings rest on single-lab functional inhibition\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"An unbiased interactome screen plus electrophysiology revealed a transport-independent role: SLC7A5 binds and profoundly suppresses Kv1.1/Kv1.2 channel gating, connecting it to neuronal excitability and channelopathy.\",\n      \"evidence\": \"MS interactome, heterologous co-expression, chimeric-channel and whole-cell patch clamp, disease-mutation validation\",\n      \"pmids\": [\"30356053\", \"33164746\", \"32311044\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the SLC7A5\\u2013Kv interaction unresolved\", \"Physiological significance in native neurons not fully established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Substrate-expansion studies showed LAT1 carries drugs and non-canonical cargo (gabapentin, pregabalin, citrulline, copper-histidinate via uniport), redefining its physiological and pharmacological scope.\",\n      \"evidence\": \"Kinetic uptake in cell lines, isotope tracing, proteoliposome transport, MS, and crystallography of the Cu(His)\\u2082 complex\",\n      \"pmids\": [\"23567998\", \"30374619\", \"27\", \"37692288\", \"39756034\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative in vivo contribution of unconventional uniport unknown\", \"Whether other metal-amino-acid complexes are physiological substrates untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Transcriptional and post-transcriptional regulators (HIF-2\\u03b1, Wnt/\\u03b2-catenin, c-Myc/SRC2, MITF, YAP/TAZ, GR, IGF2BP2/m6A, ALYREF, TRIM35) were mapped, showing SLC7A5 as a convergent node downstream of oncogenic, hypoxic, and hormonal signaling.\",\n      \"evidence\": \"ChIP/ChIP-seq, reporter assays, RIP/MeRIP, ubiquitination assays, and knockdown/rescue across multiple cell systems\",\n      \"pmids\": [\"23103253\", \"30761250\", \"31618\", \"26094588\", \"37094160\", \"32240722\", \"39704172\", \"38281999\", \"38402198\", \"39304904\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most regulatory axes shown in single labs/contexts\", \"Hierarchy and crosstalk among these inputs not integrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the transport-dependent mTORC1 role and the transport-independent Kv channel modulation are integrated within a single cell, and the in vivo physiological weight of unconventional substrates, remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure capturing both substrate transport and Kv binding\", \"Counter-substrate sustaining cellular antiport import unidentified\", \"Relative physiological importance of LNAA versus drug/metal/citrulline transport unquantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [2, 3, 17, 18, 27, 29]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [2, 10, 27]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14, 15, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [2, 3, 17, 18, 29]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 10, 11, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [13, 24, 25]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [14, 15]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [29, 30, 33]}\n    ],\n    \"complexes\": [\"LAT1/CD98 (SLC7A5\\u2013SLC3A2) heterodimeric amino acid transporter\"],\n    \"partners\": [\"SLC3A2\", \"KCNA1\", \"KCNA2\", \"NEDD4L\", \"TRIM35\", \"IGF2BP2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}