{"gene":"SLC16A10","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":2006,"finding":"TAT1 (SLC16A10) functions as a facilitated diffusion uniporter for aromatic amino acids (Trp, Phe, Tyr) at basolateral membranes, mediating net efflux without requiring an exchange substrate. The transporter shows symmetrical selectivity and apparent affinity for influx and efflux, and localizes to basolateral membranes of small intestine enterocytes, kidney proximal tubule, and sinusoidal side of perivenous hepatocytes. It is not N-glycosylated.","method":"Xenopus oocyte expression system (influx/efflux assays), real-time RT-PCR, immunofluorescence localization in mouse kidney and intestine","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro transport assays with multiple orthogonal methods including tissue localization; replicated in follow-up studies","pmids":["16245314"],"is_preprint":false},{"year":2007,"finding":"TAT1 (SLC16A10) and LAT2-4F2hc (SLC7A8-SLC3A2) cooperate functionally: TAT1-mediated aromatic amino acid recycling drives net efflux of other neutral amino acids via LAT2-4F2hc exchanger. Both transporters co-localize in early kidney proximal tubule basolateral membranes. Physical interaction between the two transporters is not required for functional cooperation.","method":"Xenopus oocyte co-expression system, HPLC amino acid analysis, immunofluorescence co-localization, co-immunoprecipitation and crosslinking (negative result for physical interaction), functional mutagenesis of inactive surface-expressed mutants","journal":"Pflugers Archiv : European journal of physiology","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods in a single study, including functional reconstitution and mutagenesis controls","pmids":["17273864"],"is_preprint":false},{"year":2005,"finding":"Human TAT1 (hTAT1/SLC16A10) transports aromatic amino acids and co-localizes with hLAT2 at the basolateral membrane of renal proximal tubule, consistent with cooperative roles in renal reabsorption of neutral amino acids.","method":"Functional expression, Northern blot, immunohistochemistry in human kidney","journal":"Archives of pharmacal research","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct localization and transport activity data in human tissue, single lab","pmids":["15918515"],"is_preprint":false},{"year":2012,"finding":"TAT1 (Slc16a10) knockout mice display elevated plasma, muscle, and kidney aromatic amino acid concentrations and major aromatic aminoaciduria under high-protein diet, demonstrating that TAT1 is required for equilibrating aromatic amino acid concentrations across basolateral membranes of kidney and intestinal epithelial cells and for enabling hepatocytes to act as a sink for extracellular aromatic amino acid homeostasis.","method":"TAT1 knockout mouse model, plasma/tissue amino acid measurements, in vivo 123I-2-I-L-Phe kidney accumulation, ex vivo everted gut sac assay, mRNA quantification of amino acid transporters","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple defined physiological readouts and orthogonal methods; strong evidence for in vivo function","pmids":["23045339"],"is_preprint":false},{"year":2013,"finding":"Mct10 (Slc16a10) facilitates thyroid hormone (TH) efflux from liver, kidneys, and thyroid gland. In Mct8/Mct10 double knockout mice, serum T4 is partially normalized (rescued) compared to Mct8 single KO, while the hyperthyroid state in peripheral tissues is exacerbated, demonstrating that Mct10 participates in tissue-specific TH efflux and contributes to the serum TH profile characteristic of Mct8 deficiency.","method":"Mct10 single KO and Mct8/Mct10 double KO mouse models, serum and tissue TH measurements, hypothalamic TRH expression analysis","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 — double KO epistasis experiment with multiple tissue-specific readouts, clear mechanistic interpretation","pmids":["24248460"],"is_preprint":false},{"year":2018,"finding":"Loss of both Slc16a2 (Mct8) and Slc16a10 (Mct10) in mice results in hearing loss, retarded development of the cochlear sensory epithelium similar to hypothyroidism, progressive degeneration of cochlear hair cells, and loss of endocochlear potential. T3 administration largely restores sensory epithelium development, indicating that both transporters are required for thyroid hormone delivery to the cochlea.","method":"Slc16a2/Slc16a10 double KO mouse model, auditory brainstem response testing, histology, T3 rescue experiment","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — double KO with rescue experiment and multiple functional readouts","pmids":["29535325"],"is_preprint":false},{"year":2018,"finding":"TAT1 (SLC16A10) and LAT2/CD98hc functionally cooperate in vivo for renal reabsorption of aromatic and other neutral amino acids. Double KO (dKO LAT2-TAT1) mice show greater aminoaciduria than either single KO, with additional loss of cationic amino acids. y+LAT1/CD98hc is upregulated as a compensatory mechanism in dKO mice.","method":"Double KO mouse model (TAT1 and LAT2), urine amino acid analysis, transporter mRNA and protein expression analysis","journal":"Journal of the American Society of Nephrology : JASN","confidence":"High","confidence_rationale":"Tier 2 — double KO epistasis in vivo with quantitative urinary readouts and compensation analysis","pmids":["29610403"],"is_preprint":false},{"year":2017,"finding":"Human MCT10 (SLC16A10) mediates tryptophan transport via facilitated diffusion (proton-gradient independent) in a yeast heterologous expression system. The N81K SNP completely abrogates tryptophan import without affecting expression or plasma membrane localization. N81 is located within the putative tryptophan trajectory in the modeled structure.","method":"Functional complementation in S. cerevisiae tat2Δtrp1 cells, growth assays, localization in HEK293T cells, structure modeling","journal":"Biochimica et biophysica acta. Biomembranes","confidence":"Medium","confidence_rationale":"Tier 2 — heterologous functional assay with mutagenesis and localization; single lab but multiple methods","pmids":["28754537"],"is_preprint":false},{"year":2016,"finding":"MCT10 (SLC16A10) and MCT8 both facilitate T3 efflux from cells. Overexpression of MCT10 potently stimulates T3 metabolism by type 3 deiodinase (D3) at the cell periphery but does not augment steady-state nuclear T3 receptor-mediated transcription, indicating that MCT10 primarily affects T3 availability at the plasma membrane rather than in the nucleus.","method":"Transient transfection in JEG3 cells, T3-responsive luciferase reporter assay, type 3 deiodinase metabolic assay, co-transfection with CRYM","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — functional cell-based assays with multiple readouts; single lab","pmids":["27492966"],"is_preprint":false},{"year":2021,"finding":"The transcription factor Six1 directly binds an enhancer in the Slc16a10 (Mct10) gene locus and is required for full MCT10 expression in adult skeletal muscle (tibialis anterior). MCT10 is the most abundantly expressed thyroid hormone transporter in skeletal muscle, with higher expression in fast-twitch than slow-twitch muscle. Loss of MCT10 in tibialis anterior reduces thyroid hormone receptor-dependent transcription and recapitulates Six1 effects on fast-twitch muscle gene expression.","method":"ChIP-seq (genome-wide Six1 location), gene expression profiling, in vivo RNAi knockdown in mouse tibialis anterior, RT-PCR, thyroid hormone reporter assay","journal":"Skeletal muscle","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo loss-of-function with defined transcriptional readout; single lab","pmids":["34809717"],"is_preprint":false},{"year":2021,"finding":"Mct10 (Slc16a10) deficiency in mice causes vesicular (non-canonical) TSH receptor localization in thyrocytes instead of basolateral localization, and reduces dead thyrocyte numbers. This effect is reversed by additional cathepsin K deficiency. The data indicate that MCT10 is required to maintain canonical basolateral TSH receptor localization and normal thyrocyte turnover.","method":"Single and multiple KO mouse models (Mct10-/-, Ctsk-/-, Mct8-/y combinations), immunofluorescence for TSH receptor localization, histology","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — multiple KO combinations with direct localization readout; single lab","pmids":["34071318"],"is_preprint":false},{"year":2022,"finding":"MCT10 (SLC16A10) deficiency in male mice causes age- and site-dependent changes in trabecular bone mass: decreased trabecular bone volume at 12 weeks, but increased bone volume at 24 weeks, with altered osteoblast and osteoclast numbers. In vitro, Mct10 deficiency impairs osteoblast differentiation and activity. Mct8/Mct10 double KO eliminates these bone effects.","method":"Mct10 KO and Mct8/Mct10 double KO mouse models, microCT, histomorphometry, in vitro osteoblast differentiation assay","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — KO mouse with multiple time points and in vitro confirmation; single lab","pmids":["34669927"],"is_preprint":false},{"year":2011,"finding":"MCT10 (SLC16A10) and MCT8 both transport the affinity-label BrAc[125I]T3 but are not covalently modified by it. Both transporters facilitate BrAc[125I]T3 transport across the plasma membrane. Differential inhibitory profiles of iodothyronine derivatives on T3 transport by MCT8 vs. MCT10 were identified.","method":"Transport assay with radiolabeled BrAc-T3 in transfected cells, mass spectrometry for labeled protein identification","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — direct transport assay with negative covalent labeling result and inhibitor profiling; single lab","pmids":["21315799"],"is_preprint":false},{"year":2024,"finding":"SLC16A10 promotes melanogenesis in melanocytes by facilitating uptake of phenylalanine. SLC16A10 overexpression increases melanin synthesis and upregulates melanogenesis-related proteins (TYR, TYRP1) at the protein but not RNA level. SLC16A10 expression is upregulated by UVB irradiation, and knockdown reduces UVB-induced melanin production and phenylalanine uptake.","method":"SLC16A10 overexpression and siRNA knockdown in MNT1 melanocytes, melanin quantification, western blot, targeted metabolomics, ELISA, gene expression datasets (GSE72140, GSE67098)","journal":"Experimental dermatology","confidence":"Medium","confidence_rationale":"Tier 2–3 — gain- and loss-of-function with metabolomics; single lab","pmids":["39171634"],"is_preprint":false},{"year":2024,"finding":"miR-21-5p directly targets SLC16A10 (confirmed by dual luciferase reporter assay). miR-21-5p overexpression reduces LPS-induced inflammatory cytokine expression (IL-1β, TNF-α) in A549 alveolar epithelial cells, and siRNA knockdown of SLC16A10 similarly reduces inflammation. Co-transfection of miR-21-5p inhibitor and si-SLC16A10 rescues the inhibitor's pro-inflammatory effect, placing SLC16A10 downstream of miR-21-5p in this pathway.","method":"Luciferase reporter assay, miRNA mimic/inhibitor transfection, siRNA knockdown, RT-qPCR, western blot in A549 cells","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — direct target validation by luciferase assay plus epistasis by rescue experiment; single lab","pmids":["38750066"],"is_preprint":false},{"year":2024,"finding":"Cryo-EM structures of human MCT10 (SLC16A10) in the inward-facing thyroxine-bound state were determined. Structural analysis revealed a network of conserved gate residues involved in conformational changes upon thyroxine binding that trigger ligand release on the opposite membrane compartment, consistent with an alternating-access mechanism.","method":"Cryo-EM structure determination of thyroxine-bound human MCT10 in inward-facing state","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure with functional interpretation; preprint but rigorous structural method","pmids":["bio_10.1101_2024.10.17.618737"],"is_preprint":true}],"current_model":"SLC16A10 (MCT10/TAT1) is a proton-gradient-independent facilitated diffusion uniporter that mediates bidirectional transport of aromatic amino acids (phenylalanine, tyrosine, tryptophan) and thyroid hormones (T3, T4) across basolateral membranes of kidney proximal tubule, small intestine, liver, and skeletal muscle; structurally, it adopts an alternating-access conformation upon substrate binding; in vivo it is required for aromatic amino acid homeostasis, cochlear development, thyroid hormone efflux from peripheral tissues, bone turnover, and melanogenesis, and it functionally cooperates with the LAT2/CD98hc exchanger to drive net neutral amino acid efflux across basolateral epithelia."},"narrative":{"teleology":[{"year":2005,"claim":"Establishing human TAT1 as an aromatic amino acid transporter co-localizing with LAT2 at the renal basolateral membrane resolved where and in what combination these transporters operate in human kidney.","evidence":"Functional expression, Northern blot, and immunohistochemistry in human kidney tissue","pmids":["15918515"],"confidence":"Medium","gaps":["Single-lab study","No efflux kinetics measured","No in vivo loss-of-function"]},{"year":2006,"claim":"Demonstrating that TAT1 operates as a facilitated diffusion uniporter with symmetrical influx/efflux kinetics — rather than as a proton-coupled or exchange transporter — established the mechanistic basis for its role as a basolateral efflux pathway for aromatic amino acids.","evidence":"Influx and efflux assays in Xenopus oocytes, immunofluorescence in mouse kidney and intestine","pmids":["16245314"],"confidence":"High","gaps":["No structural basis for uniport mechanism","No in vivo validation of essentiality"]},{"year":2007,"claim":"Showing that TAT1 and LAT2-4F2hc functionally cooperate — TAT1-mediated aromatic amino acid recycling drives net neutral amino acid efflux through the obligatory exchanger — without physical interaction explained how two independent transporters coordinate basolateral amino acid efflux.","evidence":"Xenopus oocyte co-expression, HPLC amino acid analysis, co-immunoprecipitation (negative for physical interaction), mutagenesis of inactive surface-expressed mutants","pmids":["17273864"],"confidence":"High","gaps":["Oocyte system may not fully recapitulate epithelial polarity","No in vivo confirmation of cooperation"]},{"year":2011,"claim":"Characterizing MCT10's ability to transport the affinity-label BrAc-T3 and establishing differential inhibitor profiles versus MCT8 provided initial tools to distinguish thyroid hormone handling by the two related transporters.","evidence":"Radiolabeled BrAc-T3 transport assay in transfected cells, mass spectrometry","pmids":["21315799"],"confidence":"Medium","gaps":["No substrate-bound structure to explain selectivity differences","Covalent labeling approach was negative"]},{"year":2012,"claim":"The TAT1 knockout mouse demonstrated that SLC16A10 is essential in vivo for aromatic amino acid homeostasis — its loss causes elevated plasma aromatic amino acids, aromatic aminoaciduria under high-protein diet, and impaired hepatic uptake — validating the uniporter model in a whole-organism context.","evidence":"TAT1 knockout mouse, plasma/tissue amino acid quantification, in vivo 123I-2-I-L-Phe kidney accumulation, everted gut sac assay","pmids":["23045339"],"confidence":"High","gaps":["No human genetic disorder linked","Compensatory transporter upregulation not fully mapped"]},{"year":2013,"claim":"Using Mct10 single and Mct8/Mct10 double knockout mice revealed that MCT10 mediates thyroid hormone efflux from liver, kidney, and thyroid — and that its loss contributes to the characteristic serum T4 profile of MCT8 deficiency — establishing MCT10 as a physiologically relevant thyroid hormone transporter distinct from MCT8.","evidence":"Mct10 KO and Mct8/Mct10 double KO mice, serum and tissue thyroid hormone measurements, hypothalamic TRH expression","pmids":["24248460"],"confidence":"High","gaps":["Relative contributions of MCT10 to T3 vs. T4 transport in each tissue not fully resolved","Mechanism of tissue-specific directionality unclear"]},{"year":2016,"claim":"Showing that MCT10 overexpression potently stimulates T3 metabolism by D3 at the cell periphery but does not augment nuclear T3 receptor-mediated transcription clarified that MCT10 primarily controls T3 availability at the plasma membrane rather than in the nuclear compartment.","evidence":"Co-transfection in JEG3 cells with T3-responsive reporter and D3 metabolic assay","pmids":["27492966"],"confidence":"Medium","gaps":["JEG3 is a trophoblast-derived cell line; relevance to physiological target tissues not confirmed","No direct measurement of nuclear T3 concentrations"]},{"year":2017,"claim":"Identification of N81K as a transport-dead mutant that retains normal surface expression localized a critical residue within the putative substrate trajectory, providing the first structure–function insight into the MCT10 transport path.","evidence":"Functional complementation in yeast, localization in HEK293T cells, homology modeling","pmids":["28754537"],"confidence":"Medium","gaps":["Based on homology model, not experimentally determined structure","Only one residue characterized"]},{"year":2018,"claim":"Double knockout of Mct8 and Mct10 in mice produced hearing loss and retarded cochlear sensory epithelium development — rescued by T3 administration — establishing that these two transporters together are required for thyroid hormone delivery to the developing cochlea.","evidence":"Slc16a2/Slc16a10 double KO mice, auditory brainstem response, histology, T3 rescue","pmids":["29535325"],"confidence":"High","gaps":["Individual contributions of MCT10 versus MCT8 to cochlear TH delivery not separated","Cellular identity of TH-dependent cochlear targets not defined"]},{"year":2018,"claim":"In vivo double knockout of TAT1 and LAT2 produced greater aminoaciduria than either single KO and revealed compensatory y+LAT1/CD98hc upregulation, confirming the functional cooperation model in the intact kidney and demonstrating amino acid transporter network plasticity.","evidence":"TAT1/LAT2 double KO mice, urine amino acid analysis, transporter mRNA and protein quantification","pmids":["29610403"],"confidence":"High","gaps":["Additional compensatory transporters likely exist but were not exhaustively catalogued","No human genetic confirmation of the cooperative model"]},{"year":2021,"claim":"Demonstrating that Six1 directly binds the Slc16a10 enhancer and is required for MCT10 expression in fast-twitch skeletal muscle — where MCT10 is the dominant thyroid hormone transporter — connected muscle fiber-type transcriptional programs to thyroid hormone responsiveness through MCT10.","evidence":"ChIP-seq for Six1, in vivo RNAi knockdown in mouse tibialis anterior, thyroid hormone reporter assay","pmids":["34809717"],"confidence":"Medium","gaps":["Whether Six1 regulation of MCT10 applies to other MCT10-expressing tissues is unknown","Downstream TH-responsive targets mediating fiber-type effects not identified"]},{"year":2021,"claim":"Finding that Mct10 deficiency disrupts canonical basolateral TSH receptor localization in thyrocytes — shifting it to vesicular compartments — revealed an unexpected role for MCT10 in maintaining thyroid gland signaling architecture beyond simple hormone transport.","evidence":"Mct10 KO and combinatorial KO mouse models, immunofluorescence for TSH receptor","pmids":["34071318"],"confidence":"Medium","gaps":["Mechanism linking MCT10 loss to TSH receptor mislocalization is unknown","Whether this is a direct or indirect effect is unresolved"]},{"year":2022,"claim":"MCT10 deficiency produced age- and site-dependent trabecular bone changes with altered osteoblast differentiation, and these effects were eliminated by concurrent MCT8 loss, indicating MCT10 modulates bone remodeling through thyroid hormone–dependent pathways that are counterbalanced by MCT8.","evidence":"Mct10 KO and Mct8/Mct10 double KO mice, microCT, histomorphometry, in vitro osteoblast assay","pmids":["34669927"],"confidence":"Medium","gaps":["Mechanism by which MCT8 loss rescues bone phenotype unclear","Osteoclast-specific role of MCT10 not characterized"]},{"year":2024,"claim":"SLC16A10 was shown to promote melanogenesis by supplying phenylalanine to melanocytes, with UVB-induced upregulation driving melanin production — extending the physiological scope of SLC16A10 beyond epithelial and endocrine tissues to skin pigmentation.","evidence":"Overexpression and siRNA knockdown in MNT1 melanocytes, melanin quantification, targeted metabolomics","pmids":["39171634"],"confidence":"Medium","gaps":["In vivo relevance in skin not confirmed","Whether other aromatic amino acid transporters compensate in melanocytes unknown"]},{"year":2024,"claim":"Cryo-EM structures of thyroxine-bound MCT10 in the inward-facing state revealed gate residues and conformational changes consistent with an alternating-access mechanism, providing the first experimental structural framework for understanding substrate selectivity and transport cycle.","evidence":"(preprint) Cryo-EM structure determination of thyroxine-bound human MCT10","pmids":["bio_10.1101_2024.10.17.618737"],"confidence":"High","gaps":["Outward-facing and occluded states not yet captured","Structure is from a preprint awaiting peer review","Aromatic amino acid-bound structures not determined"]},{"year":null,"claim":"Key unresolved questions include the structural basis for MCT10's dual substrate specificity (aromatic amino acids vs. thyroid hormones), the complete transport cycle conformational landscape, whether human loss-of-function variants cause a Mendelian disorder, and the mechanism by which MCT10 loss alters TSH receptor localization in thyrocytes.","evidence":"","pmids":[],"confidence":"Low","gaps":["No human disease-causing mutations identified","No outward-facing or occluded-state structures","Mechanism of TSH receptor mislocalization unknown","Tissue-specific regulation beyond Six1 not characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,3,4,7,8,12,13]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,7,8]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,1,3,4,7,12,13]}],"complexes":[],"partners":["SLC7A8","SLC3A2","SLC16A2"],"other_free_text":[]},"mechanistic_narrative":"SLC16A10 (MCT10/TAT1) is a proton-gradient-independent facilitated diffusion uniporter that mediates bidirectional transport of aromatic amino acids (tryptophan, phenylalanine, tyrosine) and thyroid hormones (T3, T4) across basolateral membranes of kidney proximal tubule, intestinal epithelium, liver, skeletal muscle, and thyroid gland [PMID:16245314, PMID:23045339, PMID:24248460]. In epithelia, TAT1-mediated aromatic amino acid recycling functionally cooperates with the LAT2/CD98hc obligatory exchanger to drive net neutral amino acid efflux without requiring direct physical interaction between the two transporters, and double knockout of TAT1 and LAT2 produces greater aminoaciduria than either single knockout [PMID:17273864, PMID:29610403]. In vivo, SLC16A10 is required for systemic aromatic amino acid homeostasis, tissue-specific thyroid hormone efflux that shapes the serum thyroid hormone profile, cochlear sensory epithelium development (in concert with MCT8), age-dependent bone remodeling, and UVB-induced melanogenesis through phenylalanine uptake into melanocytes [PMID:23045339, PMID:24248460, PMID:29535325, PMID:34669927, PMID:39171634]. In skeletal muscle, SLC16A10 is the most abundantly expressed thyroid hormone transporter and is transcriptionally regulated by the homeodomain factor Six1, linking its expression to fast-twitch muscle fiber identity and thyroid hormone–dependent gene programs [PMID:34809717]."},"prefetch_data":{"uniprot":{"accession":"Q8TF71","full_name":"Monocarboxylate transporter 10","aliases":["Aromatic amino acid transporter 1","Solute carrier family 16 member 10","T-type amino acid transporter 1"],"length_aa":515,"mass_kda":55.5,"function":"Sodium- and proton-independent thyroid hormones and aromatic acids transporter (PubMed:11827462, PubMed:18337592, PubMed:28754537). Mediates both uptake and efflux of 3,5,3'-triiodothyronine (T3) and 3,5,3',5'-tetraiodothyronine (T4) with high affinity, suggesting a role in the homeostasis of thyroid hormone levels (PubMed:18337592). Responsible for low affinity bidirectional transport of the aromatic amino acids, such as phenylalanine, tyrosine, tryptophan and L-3,4-dihydroxyphenylalanine (L-dopa) (PubMed:11827462, PubMed:28754537). 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The transporter shows symmetrical selectivity and apparent affinity for influx and efflux, and localizes to basolateral membranes of small intestine enterocytes, kidney proximal tubule, and sinusoidal side of perivenous hepatocytes. It is not N-glycosylated.\",\n      \"method\": \"Xenopus oocyte expression system (influx/efflux assays), real-time RT-PCR, immunofluorescence localization in mouse kidney and intestine\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro transport assays with multiple orthogonal methods including tissue localization; replicated in follow-up studies\",\n      \"pmids\": [\"16245314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TAT1 (SLC16A10) and LAT2-4F2hc (SLC7A8-SLC3A2) cooperate functionally: TAT1-mediated aromatic amino acid recycling drives net efflux of other neutral amino acids via LAT2-4F2hc exchanger. Both transporters co-localize in early kidney proximal tubule basolateral membranes. Physical interaction between the two transporters is not required for functional cooperation.\",\n      \"method\": \"Xenopus oocyte co-expression system, HPLC amino acid analysis, immunofluorescence co-localization, co-immunoprecipitation and crosslinking (negative result for physical interaction), functional mutagenesis of inactive surface-expressed mutants\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods in a single study, including functional reconstitution and mutagenesis controls\",\n      \"pmids\": [\"17273864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human TAT1 (hTAT1/SLC16A10) transports aromatic amino acids and co-localizes with hLAT2 at the basolateral membrane of renal proximal tubule, consistent with cooperative roles in renal reabsorption of neutral amino acids.\",\n      \"method\": \"Functional expression, Northern blot, immunohistochemistry in human kidney\",\n      \"journal\": \"Archives of pharmacal research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct localization and transport activity data in human tissue, single lab\",\n      \"pmids\": [\"15918515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TAT1 (Slc16a10) knockout mice display elevated plasma, muscle, and kidney aromatic amino acid concentrations and major aromatic aminoaciduria under high-protein diet, demonstrating that TAT1 is required for equilibrating aromatic amino acid concentrations across basolateral membranes of kidney and intestinal epithelial cells and for enabling hepatocytes to act as a sink for extracellular aromatic amino acid homeostasis.\",\n      \"method\": \"TAT1 knockout mouse model, plasma/tissue amino acid measurements, in vivo 123I-2-I-L-Phe kidney accumulation, ex vivo everted gut sac assay, mRNA quantification of amino acid transporters\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple defined physiological readouts and orthogonal methods; strong evidence for in vivo function\",\n      \"pmids\": [\"23045339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mct10 (Slc16a10) facilitates thyroid hormone (TH) efflux from liver, kidneys, and thyroid gland. In Mct8/Mct10 double knockout mice, serum T4 is partially normalized (rescued) compared to Mct8 single KO, while the hyperthyroid state in peripheral tissues is exacerbated, demonstrating that Mct10 participates in tissue-specific TH efflux and contributes to the serum TH profile characteristic of Mct8 deficiency.\",\n      \"method\": \"Mct10 single KO and Mct8/Mct10 double KO mouse models, serum and tissue TH measurements, hypothalamic TRH expression analysis\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double KO epistasis experiment with multiple tissue-specific readouts, clear mechanistic interpretation\",\n      \"pmids\": [\"24248460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Loss of both Slc16a2 (Mct8) and Slc16a10 (Mct10) in mice results in hearing loss, retarded development of the cochlear sensory epithelium similar to hypothyroidism, progressive degeneration of cochlear hair cells, and loss of endocochlear potential. T3 administration largely restores sensory epithelium development, indicating that both transporters are required for thyroid hormone delivery to the cochlea.\",\n      \"method\": \"Slc16a2/Slc16a10 double KO mouse model, auditory brainstem response testing, histology, T3 rescue experiment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double KO with rescue experiment and multiple functional readouts\",\n      \"pmids\": [\"29535325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TAT1 (SLC16A10) and LAT2/CD98hc functionally cooperate in vivo for renal reabsorption of aromatic and other neutral amino acids. Double KO (dKO LAT2-TAT1) mice show greater aminoaciduria than either single KO, with additional loss of cationic amino acids. y+LAT1/CD98hc is upregulated as a compensatory mechanism in dKO mice.\",\n      \"method\": \"Double KO mouse model (TAT1 and LAT2), urine amino acid analysis, transporter mRNA and protein expression analysis\",\n      \"journal\": \"Journal of the American Society of Nephrology : JASN\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double KO epistasis in vivo with quantitative urinary readouts and compensation analysis\",\n      \"pmids\": [\"29610403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Human MCT10 (SLC16A10) mediates tryptophan transport via facilitated diffusion (proton-gradient independent) in a yeast heterologous expression system. The N81K SNP completely abrogates tryptophan import without affecting expression or plasma membrane localization. N81 is located within the putative tryptophan trajectory in the modeled structure.\",\n      \"method\": \"Functional complementation in S. cerevisiae tat2Δtrp1 cells, growth assays, localization in HEK293T cells, structure modeling\",\n      \"journal\": \"Biochimica et biophysica acta. Biomembranes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — heterologous functional assay with mutagenesis and localization; single lab but multiple methods\",\n      \"pmids\": [\"28754537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MCT10 (SLC16A10) and MCT8 both facilitate T3 efflux from cells. Overexpression of MCT10 potently stimulates T3 metabolism by type 3 deiodinase (D3) at the cell periphery but does not augment steady-state nuclear T3 receptor-mediated transcription, indicating that MCT10 primarily affects T3 availability at the plasma membrane rather than in the nucleus.\",\n      \"method\": \"Transient transfection in JEG3 cells, T3-responsive luciferase reporter assay, type 3 deiodinase metabolic assay, co-transfection with CRYM\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional cell-based assays with multiple readouts; single lab\",\n      \"pmids\": [\"27492966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The transcription factor Six1 directly binds an enhancer in the Slc16a10 (Mct10) gene locus and is required for full MCT10 expression in adult skeletal muscle (tibialis anterior). MCT10 is the most abundantly expressed thyroid hormone transporter in skeletal muscle, with higher expression in fast-twitch than slow-twitch muscle. Loss of MCT10 in tibialis anterior reduces thyroid hormone receptor-dependent transcription and recapitulates Six1 effects on fast-twitch muscle gene expression.\",\n      \"method\": \"ChIP-seq (genome-wide Six1 location), gene expression profiling, in vivo RNAi knockdown in mouse tibialis anterior, RT-PCR, thyroid hormone reporter assay\",\n      \"journal\": \"Skeletal muscle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with defined transcriptional readout; single lab\",\n      \"pmids\": [\"34809717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Mct10 (Slc16a10) deficiency in mice causes vesicular (non-canonical) TSH receptor localization in thyrocytes instead of basolateral localization, and reduces dead thyrocyte numbers. This effect is reversed by additional cathepsin K deficiency. The data indicate that MCT10 is required to maintain canonical basolateral TSH receptor localization and normal thyrocyte turnover.\",\n      \"method\": \"Single and multiple KO mouse models (Mct10-/-, Ctsk-/-, Mct8-/y combinations), immunofluorescence for TSH receptor localization, histology\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple KO combinations with direct localization readout; single lab\",\n      \"pmids\": [\"34071318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MCT10 (SLC16A10) deficiency in male mice causes age- and site-dependent changes in trabecular bone mass: decreased trabecular bone volume at 12 weeks, but increased bone volume at 24 weeks, with altered osteoblast and osteoclast numbers. In vitro, Mct10 deficiency impairs osteoblast differentiation and activity. Mct8/Mct10 double KO eliminates these bone effects.\",\n      \"method\": \"Mct10 KO and Mct8/Mct10 double KO mouse models, microCT, histomorphometry, in vitro osteoblast differentiation assay\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with multiple time points and in vitro confirmation; single lab\",\n      \"pmids\": [\"34669927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MCT10 (SLC16A10) and MCT8 both transport the affinity-label BrAc[125I]T3 but are not covalently modified by it. Both transporters facilitate BrAc[125I]T3 transport across the plasma membrane. Differential inhibitory profiles of iodothyronine derivatives on T3 transport by MCT8 vs. MCT10 were identified.\",\n      \"method\": \"Transport assay with radiolabeled BrAc-T3 in transfected cells, mass spectrometry for labeled protein identification\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct transport assay with negative covalent labeling result and inhibitor profiling; single lab\",\n      \"pmids\": [\"21315799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SLC16A10 promotes melanogenesis in melanocytes by facilitating uptake of phenylalanine. SLC16A10 overexpression increases melanin synthesis and upregulates melanogenesis-related proteins (TYR, TYRP1) at the protein but not RNA level. SLC16A10 expression is upregulated by UVB irradiation, and knockdown reduces UVB-induced melanin production and phenylalanine uptake.\",\n      \"method\": \"SLC16A10 overexpression and siRNA knockdown in MNT1 melanocytes, melanin quantification, western blot, targeted metabolomics, ELISA, gene expression datasets (GSE72140, GSE67098)\",\n      \"journal\": \"Experimental dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — gain- and loss-of-function with metabolomics; single lab\",\n      \"pmids\": [\"39171634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"miR-21-5p directly targets SLC16A10 (confirmed by dual luciferase reporter assay). miR-21-5p overexpression reduces LPS-induced inflammatory cytokine expression (IL-1β, TNF-α) in A549 alveolar epithelial cells, and siRNA knockdown of SLC16A10 similarly reduces inflammation. Co-transfection of miR-21-5p inhibitor and si-SLC16A10 rescues the inhibitor's pro-inflammatory effect, placing SLC16A10 downstream of miR-21-5p in this pathway.\",\n      \"method\": \"Luciferase reporter assay, miRNA mimic/inhibitor transfection, siRNA knockdown, RT-qPCR, western blot in A549 cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct target validation by luciferase assay plus epistasis by rescue experiment; single lab\",\n      \"pmids\": [\"38750066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryo-EM structures of human MCT10 (SLC16A10) in the inward-facing thyroxine-bound state were determined. Structural analysis revealed a network of conserved gate residues involved in conformational changes upon thyroxine binding that trigger ligand release on the opposite membrane compartment, consistent with an alternating-access mechanism.\",\n      \"method\": \"Cryo-EM structure determination of thyroxine-bound human MCT10 in inward-facing state\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure with functional interpretation; preprint but rigorous structural method\",\n      \"pmids\": [\"bio_10.1101_2024.10.17.618737\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"SLC16A10 (MCT10/TAT1) is a proton-gradient-independent facilitated diffusion uniporter that mediates bidirectional transport of aromatic amino acids (phenylalanine, tyrosine, tryptophan) and thyroid hormones (T3, T4) across basolateral membranes of kidney proximal tubule, small intestine, liver, and skeletal muscle; structurally, it adopts an alternating-access conformation upon substrate binding; in vivo it is required for aromatic amino acid homeostasis, cochlear development, thyroid hormone efflux from peripheral tissues, bone turnover, and melanogenesis, and it functionally cooperates with the LAT2/CD98hc exchanger to drive net neutral amino acid efflux across basolateral epithelia.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SLC16A10 (MCT10/TAT1) is a proton-gradient-independent facilitated diffusion uniporter that mediates bidirectional transport of aromatic amino acids (tryptophan, phenylalanine, tyrosine) and thyroid hormones (T3, T4) across basolateral membranes of kidney proximal tubule, intestinal epithelium, liver, skeletal muscle, and thyroid gland [PMID:16245314, PMID:23045339, PMID:24248460]. In epithelia, TAT1-mediated aromatic amino acid recycling functionally cooperates with the LAT2/CD98hc obligatory exchanger to drive net neutral amino acid efflux without requiring direct physical interaction between the two transporters, and double knockout of TAT1 and LAT2 produces greater aminoaciduria than either single knockout [PMID:17273864, PMID:29610403]. In vivo, SLC16A10 is required for systemic aromatic amino acid homeostasis, tissue-specific thyroid hormone efflux that shapes the serum thyroid hormone profile, cochlear sensory epithelium development (in concert with MCT8), age-dependent bone remodeling, and UVB-induced melanogenesis through phenylalanine uptake into melanocytes [PMID:23045339, PMID:24248460, PMID:29535325, PMID:34669927, PMID:39171634]. In skeletal muscle, SLC16A10 is the most abundantly expressed thyroid hormone transporter and is transcriptionally regulated by the homeodomain factor Six1, linking its expression to fast-twitch muscle fiber identity and thyroid hormone–dependent gene programs [PMID:34809717].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing human TAT1 as an aromatic amino acid transporter co-localizing with LAT2 at the renal basolateral membrane resolved where and in what combination these transporters operate in human kidney.\",\n      \"evidence\": \"Functional expression, Northern blot, and immunohistochemistry in human kidney tissue\",\n      \"pmids\": [\"15918515\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"No efflux kinetics measured\", \"No in vivo loss-of-function\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrating that TAT1 operates as a facilitated diffusion uniporter with symmetrical influx/efflux kinetics — rather than as a proton-coupled or exchange transporter — established the mechanistic basis for its role as a basolateral efflux pathway for aromatic amino acids.\",\n      \"evidence\": \"Influx and efflux assays in Xenopus oocytes, immunofluorescence in mouse kidney and intestine\",\n      \"pmids\": [\"16245314\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural basis for uniport mechanism\", \"No in vivo validation of essentiality\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showing that TAT1 and LAT2-4F2hc functionally cooperate — TAT1-mediated aromatic amino acid recycling drives net neutral amino acid efflux through the obligatory exchanger — without physical interaction explained how two independent transporters coordinate basolateral amino acid efflux.\",\n      \"evidence\": \"Xenopus oocyte co-expression, HPLC amino acid analysis, co-immunoprecipitation (negative for physical interaction), mutagenesis of inactive surface-expressed mutants\",\n      \"pmids\": [\"17273864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Oocyte system may not fully recapitulate epithelial polarity\", \"No in vivo confirmation of cooperation\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Characterizing MCT10's ability to transport the affinity-label BrAc-T3 and establishing differential inhibitor profiles versus MCT8 provided initial tools to distinguish thyroid hormone handling by the two related transporters.\",\n      \"evidence\": \"Radiolabeled BrAc-T3 transport assay in transfected cells, mass spectrometry\",\n      \"pmids\": [\"21315799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No substrate-bound structure to explain selectivity differences\", \"Covalent labeling approach was negative\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The TAT1 knockout mouse demonstrated that SLC16A10 is essential in vivo for aromatic amino acid homeostasis — its loss causes elevated plasma aromatic amino acids, aromatic aminoaciduria under high-protein diet, and impaired hepatic uptake — validating the uniporter model in a whole-organism context.\",\n      \"evidence\": \"TAT1 knockout mouse, plasma/tissue amino acid quantification, in vivo 123I-2-I-L-Phe kidney accumulation, everted gut sac assay\",\n      \"pmids\": [\"23045339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No human genetic disorder linked\", \"Compensatory transporter upregulation not fully mapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Using Mct10 single and Mct8/Mct10 double knockout mice revealed that MCT10 mediates thyroid hormone efflux from liver, kidney, and thyroid — and that its loss contributes to the characteristic serum T4 profile of MCT8 deficiency — establishing MCT10 as a physiologically relevant thyroid hormone transporter distinct from MCT8.\",\n      \"evidence\": \"Mct10 KO and Mct8/Mct10 double KO mice, serum and tissue thyroid hormone measurements, hypothalamic TRH expression\",\n      \"pmids\": [\"24248460\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of MCT10 to T3 vs. T4 transport in each tissue not fully resolved\", \"Mechanism of tissue-specific directionality unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showing that MCT10 overexpression potently stimulates T3 metabolism by D3 at the cell periphery but does not augment nuclear T3 receptor-mediated transcription clarified that MCT10 primarily controls T3 availability at the plasma membrane rather than in the nuclear compartment.\",\n      \"evidence\": \"Co-transfection in JEG3 cells with T3-responsive reporter and D3 metabolic assay\",\n      \"pmids\": [\"27492966\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"JEG3 is a trophoblast-derived cell line; relevance to physiological target tissues not confirmed\", \"No direct measurement of nuclear T3 concentrations\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of N81K as a transport-dead mutant that retains normal surface expression localized a critical residue within the putative substrate trajectory, providing the first structure–function insight into the MCT10 transport path.\",\n      \"evidence\": \"Functional complementation in yeast, localization in HEK293T cells, homology modeling\",\n      \"pmids\": [\"28754537\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Based on homology model, not experimentally determined structure\", \"Only one residue characterized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Double knockout of Mct8 and Mct10 in mice produced hearing loss and retarded cochlear sensory epithelium development — rescued by T3 administration — establishing that these two transporters together are required for thyroid hormone delivery to the developing cochlea.\",\n      \"evidence\": \"Slc16a2/Slc16a10 double KO mice, auditory brainstem response, histology, T3 rescue\",\n      \"pmids\": [\"29535325\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual contributions of MCT10 versus MCT8 to cochlear TH delivery not separated\", \"Cellular identity of TH-dependent cochlear targets not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"In vivo double knockout of TAT1 and LAT2 produced greater aminoaciduria than either single KO and revealed compensatory y+LAT1/CD98hc upregulation, confirming the functional cooperation model in the intact kidney and demonstrating amino acid transporter network plasticity.\",\n      \"evidence\": \"TAT1/LAT2 double KO mice, urine amino acid analysis, transporter mRNA and protein quantification\",\n      \"pmids\": [\"29610403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Additional compensatory transporters likely exist but were not exhaustively catalogued\", \"No human genetic confirmation of the cooperative model\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that Six1 directly binds the Slc16a10 enhancer and is required for MCT10 expression in fast-twitch skeletal muscle — where MCT10 is the dominant thyroid hormone transporter — connected muscle fiber-type transcriptional programs to thyroid hormone responsiveness through MCT10.\",\n      \"evidence\": \"ChIP-seq for Six1, in vivo RNAi knockdown in mouse tibialis anterior, thyroid hormone reporter assay\",\n      \"pmids\": [\"34809717\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Six1 regulation of MCT10 applies to other MCT10-expressing tissues is unknown\", \"Downstream TH-responsive targets mediating fiber-type effects not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Finding that Mct10 deficiency disrupts canonical basolateral TSH receptor localization in thyrocytes — shifting it to vesicular compartments — revealed an unexpected role for MCT10 in maintaining thyroid gland signaling architecture beyond simple hormone transport.\",\n      \"evidence\": \"Mct10 KO and combinatorial KO mouse models, immunofluorescence for TSH receptor\",\n      \"pmids\": [\"34071318\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking MCT10 loss to TSH receptor mislocalization is unknown\", \"Whether this is a direct or indirect effect is unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"MCT10 deficiency produced age- and site-dependent trabecular bone changes with altered osteoblast differentiation, and these effects were eliminated by concurrent MCT8 loss, indicating MCT10 modulates bone remodeling through thyroid hormone–dependent pathways that are counterbalanced by MCT8.\",\n      \"evidence\": \"Mct10 KO and Mct8/Mct10 double KO mice, microCT, histomorphometry, in vitro osteoblast assay\",\n      \"pmids\": [\"34669927\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which MCT8 loss rescues bone phenotype unclear\", \"Osteoclast-specific role of MCT10 not characterized\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"SLC16A10 was shown to promote melanogenesis by supplying phenylalanine to melanocytes, with UVB-induced upregulation driving melanin production — extending the physiological scope of SLC16A10 beyond epithelial and endocrine tissues to skin pigmentation.\",\n      \"evidence\": \"Overexpression and siRNA knockdown in MNT1 melanocytes, melanin quantification, targeted metabolomics\",\n      \"pmids\": [\"39171634\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance in skin not confirmed\", \"Whether other aromatic amino acid transporters compensate in melanocytes unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cryo-EM structures of thyroxine-bound MCT10 in the inward-facing state revealed gate residues and conformational changes consistent with an alternating-access mechanism, providing the first experimental structural framework for understanding substrate selectivity and transport cycle.\",\n      \"evidence\": \"(preprint) Cryo-EM structure determination of thyroxine-bound human MCT10\",\n      \"pmids\": [\"bio_10.1101_2024.10.17.618737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Outward-facing and occluded states not yet captured\", \"Structure is from a preprint awaiting peer review\", \"Aromatic amino acid-bound structures not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for MCT10's dual substrate specificity (aromatic amino acids vs. thyroid hormones), the complete transport cycle conformational landscape, whether human loss-of-function variants cause a Mendelian disorder, and the mechanism by which MCT10 loss alters TSH receptor localization in thyrocytes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No human disease-causing mutations identified\", \"No outward-facing or occluded-state structures\", \"Mechanism of TSH receptor mislocalization unknown\", \"Tissue-specific regulation beyond Six1 not characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 3, 4, 7, 8, 12, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 1, 3, 4, 7, 12, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SLC7A8\",\n      \"SLC3A2\",\n      \"SLC16A2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}