{"gene":"MCOLN1","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":2008,"finding":"TRPML1 functions as a Fe2+-permeable channel in late endosomes and lysosomes, mediating iron release from these organelles into the cytosol. ML4 disease mutations impair Fe2+ permeation to varying degrees correlating with disease severity. Loss of TRPML1 results in reduced cytosolic Fe2+ and increased intralysosomal Fe2+.","method":"Radiolabelled iron uptake, cytosolic/intralysosomal iron monitoring, direct lysosomal patch-clamp electrophysiology, comparison of TRPML1−/− vs. control fibroblasts","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods including direct patch-clamp of lysosomal membrane and ion flux assays in patient cells","pmids":["18794901"],"is_preprint":false},{"year":2016,"finding":"TRPML1 acts as a ROS sensor on the lysosomal membrane; oxidants directly and specifically activate TRPML1, inducing lysosomal Ca2+ release that triggers calcineurin-dependent TFEB nuclear translocation, autophagy induction, and lysosome biogenesis. Genetic inactivation or pharmacological inhibition of TRPML1 blocks clearance of damaged mitochondria and removal of excess ROS.","method":"Pharmacological ROS manipulation, GCaMP3 lysosomal Ca2+ imaging, TFEB nuclear translocation assays, genetic knockout/knockdown with autophagic flux readouts","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Ca2+ imaging, TFEB translocation, KO phenotype), strong mechanistic chain","pmids":["27357649"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structure of mouse TRPML1 in nanodiscs reveals that PI(3,5)P2 binds to the N-terminus distal from the pore; an S2-S3 helix-turn-helix extension couples ligand binding to pore opening; the selectivity filter has multiple ion-binding sites; conserved acidic residues form a luminal Ca2+-blocking site conferring pH/Ca2+ modulation; a luminal linker domain forms a fenestrated canopy creating a divalent cation-preferring electrostatic trap.","method":"Single-particle cryo-EM in nanodiscs, mutagenesis analysis, electrophysiology","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — high-resolution cryo-EM structure combined with mutagenesis and functional validation","pmids":["29019981"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structures of full-length human TRPML1 in apo (closed, pH 7.0) and agonist-bound (open, pH 6.0) states reveal that channel opening involves dilation of a lower gate together with movement of pore helix 1; a hydrophobic cavity formed by S5, S6, and PH1 houses the synthetic agonist, distinct from TRPV1 binding site.","method":"Single-particle cryo-EM at 3.49–3.72 Å resolution","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — near-atomic resolution cryo-EM of both open and closed states","pmids":["29019983"],"is_preprint":false},{"year":2018,"finding":"Structural basis for PI(3,5)P2 and PI(4,5)P2 regulation: both lipids bind to extended helices of S1, S2, and S3. The phosphate group of PI(3,5)P2 induces a Y355–R403 π-cation interaction that moves the S4-S5 linker, allosterically activating the channel. PI(4,5)P2 acts as an inhibitor via the same site.","method":"Cryo-EM structures of human TRPML1 at pH 5.0 with PI(3,5)P2, PI(4,5)P2, or ML-SA1+PI(3,5)P2; electrophysiology","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 — atomic-resolution structures with distinct ligands combined with electrophysiological validation","pmids":["30305615"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of mouse TRPML1 in apo-closed, PI(3,5)P2-bound closed, and PI(3,5)P2/temsirolimus-bound open states reveal synergistic activation: PI(3,5)P2 binds N-terminal domain and rapamycin analog binds a distinct site; together they cooperate to fully open the channel.","method":"Cryo-EM structural determination in multiple states, patch-clamp electrophysiology","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 — multiple cryo-EM states with electrophysiology revealing cooperative gating mechanism","pmids":["35131932"],"is_preprint":false},{"year":2005,"finding":"Loss of TRPML1 causes lysosomal over-acidification; TRPML1 can function as a H+ channel providing a proton leak that limits lysosomal acidification. Over-acidification in TRPML1−/− cells reduces lysosomal lipase activity; restoring normal pH with nigericin or chloroquine rescues the lysosomal storage phenotype.","method":"Lysosomal pH measurement, H+ channel recording, lipase activity assay in TRPML1−/− patient cells, rescue experiments with ionophores","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — direct pH and channel measurements in patient-derived KO cells with functional rescue","pmids":["16361256"],"is_preprint":false},{"year":2005,"finding":"TRPML1 is a lysosomal monovalent cation channel that undergoes proteolytic cleavage by cathepsin B at Arg200-Pro201; cleavage inactivates channel activity. N- and C-terminal fragments co-immunoprecipitate and co-elute, indicating they remain associated after cleavage.","method":"Planar patch-clamp electrophysiology, N-terminal sequencing, co-immunoprecipitation, expression in cathepsin B-deficient cells, inhibitor studies","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted channel activity, identified cleavage site by N-terminal sequencing, functional inactivation demonstrated","pmids":["16257972"],"is_preprint":false},{"year":2009,"finding":"Proline-scanning mutagenesis of the TM5 region identifies gain-of-function (GOF) mutations causing constitutive Ca2+ permeability. GOF TRPML1 channels traffic beyond late endosomes/lysosomes to the plasma membrane because constitutive intralysosomal Ca2+ release triggers lysosomal exocytosis. TRPML1 is an inwardly rectifying, proton-impermeable, Ca2+/Fe2+/Mn2+-permeable channel gated via conformational change at the cytoplasmic face of TM5.","method":"Proline scanning mutagenesis, whole-cell and lysosomal patch-clamp, surface LAMP-1 staining, subcellular localization by fluorescence microscopy","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — systematic mutagenesis with direct electrophysiology and localization readouts","pmids":["19638346"],"is_preprint":false},{"year":2006,"finding":"TRPML proteins form homo- and heteromultimers. TRPML1 and TRPML2 are lysosomal homomultimers and dictate lysosomal localization of TRPML3 (which alone resides in the ER) through heteromultimerization.","method":"Co-immunoprecipitation, subcellular localization by fluorescence microscopy, disruption of lysosomal targeting signals","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP with localization rescue experiments establishing hierarchy","pmids":["16606612"],"is_preprint":false},{"year":2019,"finding":"TRPML1 activation triggers autophagosome biogenesis via lysosomal Ca2+ release activating CaMKKβ and AMPK, which increase activation of ULK1 and VPS34 autophagic complexes and PI3P generation, independently of TFEB. MLIV patient cells show reduced recruitment of PI3P-binding proteins to the phagophore.","method":"Pharmacological activation/inhibition of TRPML1, CaMKKβ/AMPK/ULK1/VPS34 biochemical assays, PI3P biosensor imaging, MLIV patient fibroblast analysis","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal pathway assays with genetic/pharmacological perturbations and disease cell validation","pmids":["31822666"],"is_preprint":false},{"year":2020,"finding":"TRPML1-mediated lysosomal Ca2+ release at mitochondria-lysosome contact sites promotes calcium transfer to mitochondria, dependent on tethering of contact sites and requiring VDAC1 and the mitochondrial calcium uniporter. MLIV patient fibroblasts show altered contact dynamics and defective contact-dependent mitochondrial calcium uptake.","method":"High-resolution live-cell microscopy, organelle Ca2+ imaging, contact site analysis, MLIV patient fibroblast studies","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — direct imaging of contact sites with functional Ca2+ transfer assays and disease model validation","pmids":["32703809"],"is_preprint":false},{"year":2015,"finding":"TRPML1 is a PI(3,5)P2-gated lysosomal Ca2+ channel required for phagosome-lysosome fusion in macrophages. PIKfyve synthesizes PI(3,5)P2 to activate TRPML1, and the resulting Ca2+ release drives membrane fusion. Silencing TRPML1 causes lysosomes to dock but not fuse with phagosomes; forcible Ca2+ release rescues maturation.","method":"TRPML1 siRNA knockdown, PIKfyve pharmacological inhibition, phagosome isolation, lysosomal marker acquisition assays, ionomycin rescue, cytosolic Ca2+ measurement","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 — genetic and pharmacological perturbations with mechanistic rescue experiments","pmids":["26010303"],"is_preprint":false},{"year":2018,"finding":"mTORC1 (TOR kinase) directly phosphorylates TRPML1 to inactivate the channel. Mutating TOR phosphorylation sites to unphosphorylatable residues blocks TOR-mediated TRPML1 regulation. Conversely, starvation relieves mTORC1-mediated inhibition of TRPML1, and activated TRPML1 then reactivates mTORC1 via calmodulin in a negative feedback loop.","method":"Phosphorylation site mutagenesis, kinase inhibition, mTORC1 activity assays, TRPML1 channel electrophysiology, calmodulin inhibition","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1-2 — direct phosphorylation by TOR with mutagenesis confirmation and functional channel/signaling readouts","pmids":["29460684","26195823"],"is_preprint":false},{"year":2021,"finding":"TRPML1 mediates lysosomal Zn2+ release into the cytosol. Activation of TRPML1 by agonists blocks autophagosome-lysosome fusion by disrupting interaction of STX17 (autophagosome SNARE) with VAMP8 (lysosome SNARE), thereby arresting autophagic flux. This zinc-dependent block of SNARE-mediated fusion is replicated by extracellular zinc, confirming zinc as the effector.","method":"TRPML1 agonist/antagonist pharmacology, zinc chelation, co-immunoprecipitation of STX17/VAMP8, autophagy flux assays, xenograft tumor models","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — co-IP demonstrating SNARE disruption by zinc, multiple cell types and in vivo validation","pmids":["33890549"],"is_preprint":false},{"year":2019,"finding":"TRPML1 maintains oncogenic HRAS in signaling-competent nanoclusters at the plasma membrane by mediating cholesterol de-esterification and transport from endolysosomes to the plasma membrane. TRPML1 inhibition causes cholesterol accumulation in endolysosomes, loss of HRAS from the plasma membrane, and reduced ERK phosphorylation.","method":"MCOLN1 knockdown and pharmacological inhibition, cholesterol localization imaging, HRAS nanoclustering analysis, ERK phosphorylation assays","journal":"EMBO Reports","confidence":"High","confidence_rationale":"Tier 2 — mechanistic chain from TRPML1 to cholesterol transport to HRAS signaling with multiple readouts","pmids":["30787043"],"is_preprint":false},{"year":2024,"finding":"AKT directly phosphorylates TRPML1 at Ser343, which inhibits K552 ubiquitination and proteasomal degradation of TRPML1, thereby promoting TRPML1 binding to ARL8B and triggering lysosomal exocytosis. This TRPML1-mediated exocytosis reduces intracellular ferrous iron and enhances membrane repair, protecting AKT-hyperactivated cancer cells from ferroptosis.","method":"Genome-wide CRISPR-Cas9 screen, kinase inhibitor library screen, phosphorylation site mapping, co-IP of TRPML1-ARL8B, ubiquitination assays, lysosomal exocytosis assays, in vivo tumor models","journal":"Science Translational Medicine","confidence":"High","confidence_rationale":"Tier 1-2 — CRISPR screen plus direct phosphorylation mapping with mechanistic co-IP and in vivo validation","pmids":["38924427"],"is_preprint":false},{"year":2010,"finding":"Loss of TRPML1 causes intracellular chelatable zinc dyshomeostasis with zinc accumulation in lysosomes and elevated brain zinc in TRPML1−/− mice, establishing a role for TRPML1 in zinc efflux from lysosomes.","method":"siRNA knockdown in HEK-293 cells, spectrofluorometric zinc quantification in MLIV patient fibroblasts, ICP-MS on TRPML1−/− mouse brain tissue","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — complementary cell and in vivo zinc quantification with KO mouse model","pmids":["20864526"],"is_preprint":false},{"year":2013,"finding":"TRPML1 interacts with TMEM163 (a putative zinc transporter) as demonstrated by yeast two-hybrid, co-immunoprecipitation, mass spectrometry, and confocal colocalization. This interaction modulates cellular zinc homeostasis; TMEM163 plasma membrane levels decrease when co-expressed with TRPML1, and knockdown of TMEM163 or combined TMEM163/TRPML1 knockdown elevates intracellular zinc.","method":"Yeast two-hybrid, co-immunoprecipitation, mass spectrometry, confocal microscopy, siRNA knockdown, zinc quantification","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal interaction assays with functional zinc homeostasis readout","pmids":["25130899"],"is_preprint":false},{"year":2010,"finding":"TRPML1 is required for parietal cell membrane trafficking: it is dynamically palmitoylated and dephosphorylated following histamine stimulation of acid secretion. Loss of TRPML1 reduces levels and mislocalizes the gastric proton pump, alters secretory canaliculi, and causes hypochlorhydria; this indicates TRPML1 functions in tubulovesicle formation and trafficking.","method":"Trpml1−/− mouse model, histology, ultrastructural analysis, biochemical analyses of proton pump levels and localization, palmitoylation/phosphorylation assays, gastric acid secretion measurements","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with ultrastructural, biochemical, and physiological readouts; palmitoylation identified as PTM","pmids":["21111738"],"is_preprint":false},{"year":2012,"finding":"Acute siRNA-mediated loss of TRPML1 causes cathepsin B (CatB) leak from lysosomes into the cytoplasm, triggering Bax-dependent apoptosis. CatB inhibition prevents apoptosis; Bax inhibition prevents apoptosis but not CatB leak, placing CatB leak upstream of Bax activation.","method":"siRNA knockdown, cathepsin B activity/localization assays, apoptosis assays, CatB inhibitor pharmacology, Bax inhibition","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — genetic KD with epistatic pharmacological dissection of CatB-Bax pathway","pmids":["22262857"],"is_preprint":false},{"year":2020,"finding":"TRPML1 channels in late endosomes/lysosomes of vascular smooth muscle cells form stable nanoscale complexes with type 2 ryanodine receptors (RyR2) on the sarcoplasmic reticulum. TRPML1-mediated Ca2+ release initiates RyR2-dependent Ca2+ sparks that activate BK channels; loss of TRPML1 abolishes Ca2+ sparks, renders arteries hypercontractile, and causes spontaneous hypertension in Mcoln1−/− mice.","method":"TRPML1-KO mice, super-resolution microscopy (nanoscale colocalization), live-cell confocal Ca2+ imaging, ex vivo pressure myography, in vivo radiotelemetry","journal":"Science Signaling","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with super-resolution structural evidence, functional Ca2+ imaging, and in vivo blood pressure measurement","pmids":["32576680"],"is_preprint":false},{"year":2017,"finding":"TRPML1-mediated lysosomal Ca2+ release activates calmodulin (CaM) to promote lysosome fission/size regulation. Activation of TRPML1 suppresses vacuolin-1- or P2X4-induced lysosomal enlargement; this effect requires Ca2+ and CaM, not the lysosomal Na+ channel TPC2.","method":"TRPML1 overexpression/activation, vacuolin-1 and P2X4 treatment, Ca2+ chelation, CaM inhibition, lysosome size quantification","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — pharmacological and genetic dissection with specific pathway requirements demonstrated","pmids":["28360104"],"is_preprint":false},{"year":2011,"finding":"Although TRPML1 and TPC2 co-immunoprecipitate and colocalize, they function as independent ion channels: TPC1/TPC2 do not affect TRPML1 channel activity, and TRPML1 does not mediate NAADP-evoked Ca2+ signals (NAADP-Ca2+ responses are identical in wild-type and TRPML1−/− cells). TPCs, not TRPMLs, are the NAADP targets.","method":"Co-immunoprecipitation, colocalization, patch-clamp of TRPML1 and TPC channels, NAADP-Ca2+ measurement in TRPML1−/− cells and pancreatic acinar cells","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — direct channel recordings combined with genetic KO cells definitively separating TRPML1 from NAADP pathway","pmids":["21540176"],"is_preprint":false},{"year":2011,"finding":"CUP-5, the C. elegans ortholog of TRPML1, localizes to lysosomes (not gut granules) and is required for lysosome biogenesis and proteolytic degradation in autolysosomes. cup-5 mutations cause enlarged autolysosomes with defective degradation; reduced autophagy activity partially suppresses cup-5 mutant phenotypes.","method":"C. elegans genetics, autophagy substrate accumulation assays, organelle marker colocalization, genetic epistasis with autophagy mutants","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — ortholog with genetic epistasis and defined lysosomal localization with functional consequence","pmids":["21997367"],"is_preprint":false},{"year":2022,"finding":"LAMTOR1 (Ragulator subunit) directly interacts with TRPML1 through its N-terminal domain and tonically inhibits TRPML1 activity independently of mTORC1. Disrupting LAMTOR1-TRPML1 binding increases TRPML1-mediated Ca2+ release, activates calcineurin-dependent GluA1 dephosphorylation, promotes lysosomal degradation of GluA1, and impairs synaptic plasticity and memory in mice.","method":"Co-immunoprecipitation, LAMTOR1 deletion/domain mapping, GCaMP3 Ca2+ imaging in hippocampal neurons, dendritic lysosome trafficking imaging, synaptic plasticity recordings, behavioral assays","journal":"EMBO Journal","confidence":"High","confidence_rationale":"Tier 2 — direct interaction mapping with multiple functional readouts from molecular to behavioral level","pmids":["35099830"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structure of human TRPML1 with antagonist ML-SI3 at 2.9-Å resolution reveals that ML-SI3 binds to the same hydrophobic S5/S6/PH1 cavity as agonist ML-SA1. ML-SI3 competes with ML-SA1 but does not block PI(3,5)P2-dependent activation, demonstrating two functionally distinct activation pathways.","method":"Cryo-EM, whole-lysosome electrophysiology, competitive binding studies","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 — near-atomic resolution structure with electrophysiological functional validation","pmids":["34171299"],"is_preprint":false},{"year":2014,"finding":"TRPML1 mediates lysosomal Ca2+ release in response to the synthetic agonist ML-SA1 and the endogenous ligand PI(3,5)P2. F465L mutation renders TRPML1 pH-insensitive; F408Δ impacts synthetic ligand binding. Small-molecule activators can restore TRPML1 mutant channel function and rescue trafficking defects and lysosomal zinc accumulation in MLIV patient fibroblasts.","method":"Whole-lysosome planar patch-clamp, MLIV patient fibroblast studies, zinc accumulation assays, trafficking assays","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1-2 — direct lysosomal patch-clamp with mutant characterization and functional disease-relevant rescue","pmids":["25119295"],"is_preprint":false},{"year":2022,"finding":"Oxidative stress-induced phosphorylation of JIP4 at T217 by CaMK2G in response to TRPML1-mediated Ca2+ fluxes regulates lysosomal retrograde transport and clustering. TRPML1-ALG2 pathway operates downstream, and the phosphorylation status of JIP4 acts as a switch between oxidative-stress-induced versus starvation-induced lysosomal retrograde transport.","method":"JIP4/TRPML1/ALG2 genetic KO and rescue, acrolein/H2O2 treatment, phosphorylation site mapping (T217), CaMK2G inhibition, lysosome positioning imaging","journal":"EMBO Journal","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with phosphorylation site identification and multiple pathway readouts","pmids":["36394115"],"is_preprint":false},{"year":2019,"finding":"Acid ceramidase (AC) product sphingosine activates TRPML1 channel-mediated Ca2+ release; ceramide and sphingomyelin have different modulatory effects on TRPML1 in podocytes. AC inhibition attenuates TRPML1 activity. TRPML1-mediated Ca2+ release controls lysosome-multivesicular body interaction and suppresses exosome release.","method":"Port-a-Patch planar patch-clamp, GCaMP3 Ca2+ imaging, AC inhibitor carmofur, structured illumination microscopy of lysosome-MVB interactions, nanoparticle tracking for exosomes","journal":"American Journal of Physiology – Cell Physiology","confidence":"High","confidence_rationale":"Tier 1-2 — direct channel recordings with lipid modulators and functional membrane trafficking readouts","pmids":["31268777"],"is_preprint":false},{"year":2025,"finding":"TRPML1 is activated secondarily to ROS elevation upon inflammatory stimuli, mediating release of lysosomal Fe2+ into the cytosol. Released Fe2+ activates prolyl hydroxylase domain enzymes (PHDs), which then suppress NF-κB transcriptional activity, resulting in inhibited IL-1β (IL1B) transcription in macrophages. In vivo TRPML1 stimulation ameliorates colitis.","method":"TRPML1 agonist/antagonist pharmacology, Fe2+ release assays, PHD activity measurement, NF-κB reporter assays, IL-1β quantification, TRPML1 KO and siRNA, DSS-colitis mouse model","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 — mechanistic chain from TRPML1 to Fe2+ to PHDs to NF-κB with in vivo validation","pmids":["39856099"],"is_preprint":false},{"year":2024,"finding":"TRPML1 activation promotes autophagosome-lysosome fusion through Ca2+-dependent delivery of lysosomal SNARE proteins (syntaxin 7, VAMP7) via SNARE carrier vesicles, thereby activating lysosomal acidification and hydrolase activity within 10–20 min of TRPML1 activation. Incoming vesicle fusion is a prerequisite that generates PI(3,5)P2 to activate TRPML1 in a positive feedback.","method":"Pharmacological TRPML1 activation (ML-SA1), pH imaging, hydrolase activity assays, SNARE trafficking analysis, autophagy flux measurements","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — mechanistic dissection with SNARE trafficking readouts and kinetic experiments","pmids":["39433126"],"is_preprint":false},{"year":2013,"finding":"siRNA-induced TRPML1 knockdown leads to lysosomal enlargement and zinc accumulation when cells are exposed to high zinc; this is ameliorated by knockdown of zinc-sensitive transcription factor MTF-1 or zinc transporter ZnT4. TRPML1 knockdown delays zinc leak from lysosomes to cytoplasm, and elevated cytoplasmic zinc drives MT2a transcription.","method":"siRNA knockdown, zinc staining (LysoTracker/zinc fluorophore), MTF-1 and ZnT4 co-knockdown epistasis, lysosomal secretion assays, mRNA quantification","journal":"Biochemical Journal","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with functional zinc trafficking readouts","pmids":["23368743"],"is_preprint":false},{"year":2021,"finding":"TRPML1 co-immunoprecipitates with the ER Ca2+ sensor STIM1 in motor neurons. STIM1 is required for TRPML1-mediated Ca2+ release; loss of STIM1 abolishes ML-SA1 and PI(3,5)P2-induced Ca2+ efflux through TRPML1. TRPML1 co-localizes with ER marker and LAMP1 in motor neurons.","method":"Co-immunoprecipitation, GCaMP3-ML1 Ca2+ indicator, siRNA knockdown, confocal colocalization in motor neurons","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with functional Ca2+ imaging; single lab study","pmids":["33484198"],"is_preprint":false},{"year":2019,"finding":"TLR3 activation triggers lysosomal alkalization, which activates TRPML1, leading to lysosomal ATP and acid phosphatase release (lysosomal exocytosis) in astrocytes and RPE cells. TRPML1 agonist ML-SA1 is sufficient to trigger this release; TRPML1-KO cells show blunted poly(I:C)-dependent ATP release.","method":"TRPML1-KO cells, ML-SA1 agonist, ATP/acid phosphatase release assays, lysosomal pH measurement, TBK-1 inhibition","journal":"Scientific Reports","confidence":"Medium","confidence_rationale":"Tier 2 — KO cells with agonist/inhibitor pharmacology and multiple release readouts; single lab","pmids":["29636491"],"is_preprint":false},{"year":2020,"finding":"TRPML1 channels in bladder and urethral smooth muscle cells form nanoscale complexes with RyR2 on the sarcoplasmic reticulum, similar to vascular SMCs. Loss of TRPML1 in Mcoln1−/− mice impairs Ca2+ sparks and BK channel activity, rendering lower urinary tract smooth muscle hypercontractile and causing bladder overactivity.","method":"Mcoln1−/− mouse, lattice light-sheet microscopy, super-resolution colocalization, Ca2+ spark imaging, BK channel electrophysiology, ex vivo contractility, voiding assays","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with super-resolution structural evidence and multiple functional readouts across organ systems","pmids":["33199609"],"is_preprint":false},{"year":2019,"finding":"TRPML1-mediated lysosomal exocytosis is required for adipogenesis. TRPML1 expression increases during adipogenic differentiation; acute TRPML1 deletion reduces lipid synthesis, marker gene expression, and exosome release from mature adipocytes.","method":"TRPML1 deletion in OP9 pre-adipocytes, lipid synthesis assays, differentiation marker gene expression, exosome quantification","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 — genetic deletion with multiple functional readouts; single lab","pmids":["30711251"],"is_preprint":false},{"year":2017,"finding":"Lysosomal adenosine accumulation (from ADA deficiency) inhibits TRPML1 channel activity; overexpressing ENT3 (adenosine transporter) rescues TRPML1 activity and lysosomal function. ADA deficiency causes lysosome enlargement, alkalinization, and dysfunction that are rescued by TRPML1 activation. This mechanism links purine metabolism to lysosomal Ca2+ homeostasis.","method":"ADA-KO cells, TRPML1 electrophysiology, ENT3 overexpression rescue, lysosomal pH measurement, B-lymphocyte oxidative stress assays","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with channel-level and functional lysosomal rescue; single lab","pmids":["28087698"],"is_preprint":false},{"year":2014,"finding":"Loss of TRPML1 promotes ROS production via trapped lysosomal Fe2+; TRPML1-knockdown cells exposed to Fe2+ show mitochondrial fragmentation, loss of mitochondrial membrane potential, ROS buildup, lipid peroxidation, and oxidative stress gene induction—all reversed by the ROS chelator α-tocopherol.","method":"siRNA knockdown, Fe2+ treatment, mitochondrial morphology imaging, membrane potential assays, ROS/lipid peroxidation measurement, α-tocopherol rescue","journal":"Biochemical Journal","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic chain from TRPML1-loss to Fe2+ accumulation to ROS; single lab","pmids":["24192042"],"is_preprint":false},{"year":2008,"finding":"TRPML1 functions as an NAADP-sensitive lysosomal Ca2+ release channel in coronary arterial myocytes; siRNA silencing of TRPML1 reduces NAADP-activated lysosomal Ca2+ channel activity by ~71% in reconstituted lysosomal preparations, and anti-TRPML1 antibodies almost abolish NAADP-induced channel activation.","method":"siRNA knockdown, lysosomal channel reconstitution, NAADP pharmacology, FRET, intracellular Ca2+ imaging","journal":"Journal of Cellular and Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2 — channel reconstitution with siRNA validation; single lab, later contradicted by paper 21540176 for non-vascular cells","pmids":["18754814"],"is_preprint":false}],"current_model":"TRPML1/MCOLN1 is a non-selective, inwardly-rectifying cation channel (permeable to Ca2+, Fe2+, Zn2+, H+) localized to late endosomal/lysosomal membranes, where it is activated by PI(3,5)P2 binding to transmembrane helices S1-S3 (via an allosteric S4-S5 linker mechanism) and inhibited by mTORC1-mediated phosphorylation; upon activation, it releases Ca2+, Fe2+, and Zn2+ into the cytosol to regulate lysosomal exocytosis (via ARL8B), autophagosome-lysosome fusion (via SNARE regulation and CaMKKβ/AMPK/VPS34 signaling), lysosome fission (via calmodulin), TFEB nuclear translocation (via calcineurin), mitochondrial Ca2+ uptake at organelle contact sites, and vascular/urinary smooth muscle Ca2+ spark initiation through nanoscale RyR2 complexes, while loss of TRPML1 causes lysosomal iron and zinc accumulation, over-acidification, and defective membrane trafficking underlying mucolipidosis type IV."},"narrative":{"teleology":[{"year":2005,"claim":"Establishing TRPML1 as an ion channel with lysosomal pH-regulatory function resolved the question of whether the channel contributes to lysosomal acidification and how its loss causes storage disease.","evidence":"Lysosomal pH measurements and H⁺ channel recordings in TRPML1⁻/⁻ patient fibroblasts with ionophore rescue of lipase activity; parallel identification of cathepsin B cleavage at R200-P201 inactivating channel activity","pmids":["16361256","16257972"],"confidence":"High","gaps":["Whether H⁺ permeation is physiologically relevant versus secondary to other ion fluxes","Relative contribution of cleavage-mediated inactivation in vivo"]},{"year":2006,"claim":"Demonstration that TRPML1 forms homo- and heteromultimers with TRPML2/3 and dictates lysosomal targeting of the complex resolved how TRPML channel family members achieve compartment-specific localization.","evidence":"Reciprocal co-IP and localization rescue upon disruption of lysosomal targeting signals","pmids":["16606612"],"confidence":"High","gaps":["Stoichiometry and structure of heteromultimeric complexes","Functional differences between homo- and heteromultimeric channels"]},{"year":2008,"claim":"Identifying TRPML1 as a Fe²⁺-permeable lysosomal channel whose disease mutations impair iron permeation established a direct mechanistic link between channel dysfunction and lysosomal metal accumulation in mucolipidosis IV.","evidence":"Lysosomal patch-clamp electrophysiology, radiolabeled iron uptake, and cytosolic/intralysosomal iron monitoring in TRPML1⁻/⁻ versus control fibroblasts","pmids":["18794901"],"confidence":"High","gaps":["Whether Fe²⁺ transport is direct or facilitated by co-transported ions","Molecular determinants of Fe²⁺ selectivity in the pore"]},{"year":2009,"claim":"Systematic proline-scanning mutagenesis of TM5 revealed that constitutive TRPML1 activation drives lysosomal exocytosis and plasma membrane trafficking, linking channel gating to membrane fusion events.","evidence":"Gain-of-function mutagenesis with patch-clamp, surface LAMP-1 staining, and subcellular localization in heterologous cells","pmids":["19638346"],"confidence":"High","gaps":["Identity of the Ca²⁺ effector coupling channel opening to exocytic machinery","Whether constitutive exocytosis reflects a physiological or pathological state"]},{"year":2010,"claim":"Demonstrating lysosomal Zn²⁺ accumulation in TRPML1-deficient cells and mouse brain established TRPML1 as a zinc efflux channel, broadening its role beyond iron to general divalent cation homeostasis.","evidence":"siRNA knockdown, spectrofluorometric zinc quantification in MLIV fibroblasts, ICP-MS on TRPML1⁻/⁻ mouse brain; complemented by parietal cell studies showing TRPML1 palmitoylation-dependent membrane trafficking","pmids":["20864526","21111738"],"confidence":"High","gaps":["Relative Zn²⁺ versus Fe²⁺ permeability under physiological conditions","Structural basis of zinc permeation"]},{"year":2011,"claim":"Definitive separation of TRPML1 from the NAADP–TPC signaling axis clarified that TRPML1 and TPC channels are independent lysosomal Ca²⁺ release pathways despite physical colocalization.","evidence":"Patch-clamp recordings showing unchanged NAADP-evoked Ca²⁺ signals in TRPML1⁻/⁻ cells; co-IP confirming proximity without functional coupling","pmids":["21540176"],"confidence":"High","gaps":["Whether TRPML1 and TPCs cooperate under specific physiological stimuli","Earlier report of NAADP sensitivity in coronary myocytes remains unreconciled"]},{"year":2012,"claim":"Discovery that acute TRPML1 loss causes cathepsin B leakage and Bax-dependent apoptosis revealed TRPML1 as essential for lysosomal membrane integrity and connected its dysfunction to cell death pathways.","evidence":"siRNA knockdown with epistatic pharmacological dissection (CatB inhibitor, Bax inhibitor) ordering CatB leak upstream of Bax activation","pmids":["22262857"],"confidence":"High","gaps":["Whether lysosomal membrane permeabilization is a direct consequence of ion imbalance or secondary to trafficking defects"]},{"year":2013,"claim":"Identification of TMEM163 as a direct TRPML1 interactor that modulates zinc homeostasis, and epistatic analysis of MTF-1/ZnT4 in TRPML1-knockdown cells, built a pathway model for lysosomal zinc efflux.","evidence":"Yeast two-hybrid, co-IP, mass spectrometry, and siRNA co-knockdown epistasis with zinc quantification","pmids":["25130899","23368743"],"confidence":"High","gaps":["Whether TMEM163 directly conducts Zn²⁺ or modulates TRPML1 pore properties","In vivo validation of the TMEM163–TRPML1 partnership"]},{"year":2014,"claim":"Characterization of ML-SA1 and PI(3,5)P₂ as direct TRPML1 agonists via lysosomal patch-clamp, and rescue of MLIV patient cell phenotypes with small-molecule activators, established the pharmacological framework for TRPML1 modulation.","evidence":"Whole-lysosome planar patch-clamp with mutant characterization (F465L, F408Δ), zinc accumulation rescue in MLIV fibroblasts","pmids":["25119295"],"confidence":"High","gaps":["In vivo therapeutic efficacy of ML-SA1 class agonists","Long-term safety of chronic TRPML1 activation"]},{"year":2015,"claim":"Showing that PIKfyve-generated PI(3,5)P₂ activates TRPML1 to drive Ca²⁺-dependent phagosome–lysosome fusion in macrophages placed TRPML1 centrally in innate immune function.","evidence":"TRPML1 siRNA, PIKfyve inhibition, phagosome isolation, lysosomal marker acquisition, ionomycin rescue","pmids":["26010303"],"confidence":"High","gaps":["Whether TRPML1 is the sole PI(3,5)P₂ effector for phagosome maturation","Identity of the Ca²⁺-sensitive fusion machinery downstream"]},{"year":2016,"claim":"Discovery that ROS directly activate TRPML1 to trigger calcineurin/TFEB-dependent autophagy and lysosome biogenesis established TRPML1 as a lysosomal oxidative stress sensor.","evidence":"Pharmacological ROS manipulation, GCaMP3 lysosomal Ca²⁺ imaging, TFEB nuclear translocation, KO phenotype with defective mitophagy","pmids":["27357649"],"confidence":"High","gaps":["Direct ROS binding site on TRPML1 not identified","Whether ROS sensitivity is redox-dependent or mediated by lipid intermediates"]},{"year":2017,"claim":"Near-atomic cryo-EM structures of TRPML1 in closed and open states revealed the pore architecture, luminal polycation trap, Ca²⁺-blocking gate, and PI(3,5)P₂ binding site, transforming mechanistic understanding from pharmacology to structure.","evidence":"Cryo-EM of mouse and human TRPML1 at 3.5–3.7 Å in nanodiscs, with mutagenesis and electrophysiology validation","pmids":["29019981","29019983"],"confidence":"High","gaps":["No structure of a disease-associated mutant","Conformational transitions during ion permeation not captured"]},{"year":2017,"claim":"Demonstrating that TRPML1-released Ca²⁺ activates calmodulin to promote lysosome fission resolved the mechanism by which TRPML1 controls lysosome size.","evidence":"TRPML1 activation/overexpression with CaM inhibition, Ca²⁺ chelation, and lysosome size quantification","pmids":["28360104"],"confidence":"High","gaps":["Identity of downstream CaM effectors mediating membrane scission","How fission is coordinated with fusion events"]},{"year":2018,"claim":"Structures with PI(3,5)P₂ and PI(4,5)P₂ bound revealed that both lipids share the S1–S3 binding pocket but PI(3,5)P₂ induces a Y355–R403 π-cation interaction moving the S4–S5 linker to open the channel, while PI(4,5)P₂ inhibits it—explaining compartment-specific gating.","evidence":"Cryo-EM structures of human TRPML1 at pH 5.0 with different phosphoinositides, electrophysiology","pmids":["30305615"],"confidence":"High","gaps":["Dynamics of lipid exchange at the binding site in intact membranes","Whether other lysosomal lipids modulate binding"]},{"year":2018,"claim":"Identification of mTORC1 as a direct kinase that phosphorylates and inhibits TRPML1, with a starvation-relief/calmodulin-dependent feedback loop, integrated TRPML1 into nutrient-sensing signaling.","evidence":"Phosphorylation site mutagenesis, mTORC1 kinase assays, TRPML1 electrophysiology, calmodulin inhibition","pmids":["29460684","26195823"],"confidence":"High","gaps":["Specific phosphorylation sites on TRPML1 targeted by mTORC1 not fully mapped","Whether other kinases phosphorylate the same sites"]},{"year":2019,"claim":"Demonstration that TRPML1 drives autophagosome biogenesis via CaMKKβ/AMPK/ULK1/VPS34 independently of TFEB revealed a second, parallel pro-autophagic signaling arm downstream of lysosomal Ca²⁺.","evidence":"Pharmacological TRPML1 activation/inhibition, AMPK/ULK1/VPS34 biochemical assays, PI3P biosensor imaging, MLIV patient fibroblasts","pmids":["31822666"],"confidence":"High","gaps":["How TFEB-dependent and AMPK-dependent arms are coordinated temporally","Whether the AMPK arm operates in all cell types"]},{"year":2019,"claim":"Linking TRPML1 to cholesterol egress from endolysosomes and maintenance of plasma membrane HRAS nanoclusters extended TRPML1's role to lipid transport and oncogenic signaling.","evidence":"MCOLN1 knockdown and pharmacological inhibition with cholesterol imaging, HRAS nanoclustering analysis, ERK phosphorylation","pmids":["30787043"],"confidence":"High","gaps":["Whether cholesterol transport is direct or mediated by NPC1/NPC2","Generality to other RAS isoforms"]},{"year":2019,"claim":"Sphingosine, generated by acid ceramidase, was identified as an endogenous lipid activator of TRPML1 that controls lysosome–MVB interactions and exosome release.","evidence":"Planar patch-clamp with sphingolipids, AC inhibitor carmofur, SIM imaging of lysosome–MVB contacts, nanoparticle tracking","pmids":["31268777"],"confidence":"High","gaps":["Binding site for sphingosine on TRPML1 not determined","In vivo relevance for exosome-dependent signaling"]},{"year":2020,"claim":"Discovery of nanoscale TRPML1–RyR2 complexes at lysosome–SR junctions in smooth muscle, where TRPML1 initiates Ca²⁺ sparks that activate BK channels, established a non-canonical physiological role causing hypertension and bladder overactivity when lost.","evidence":"Super-resolution microscopy, Ca²⁺ spark imaging, BK electrophysiology, pressure myography, radiotelemetry, and voiding assays in Mcoln1⁻/⁻ mice","pmids":["32576680","33199609"],"confidence":"High","gaps":["Molecular basis of TRPML1–RyR2 physical coupling","Whether this mechanism operates in non-muscle excitable cells"]},{"year":2020,"claim":"Demonstration that TRPML1-mediated Ca²⁺ release at mitochondria–lysosome contact sites drives VDAC1/MCU-dependent mitochondrial Ca²⁺ uptake connected TRPML1 to inter-organelle calcium transfer.","evidence":"High-resolution live-cell contact site imaging, organelle-targeted Ca²⁺ indicators, MLIV patient fibroblasts","pmids":["32703809"],"confidence":"High","gaps":["Identity of tethering proteins mediating TRPML1-proximal contacts","Quantitative contribution relative to ER-mediated mitochondrial Ca²⁺ supply"]},{"year":2021,"claim":"Showing that TRPML1-released Zn²⁺ disrupts STX17–VAMP8 SNARE interaction to block autophagosome–lysosome fusion revealed zinc as a second messenger downstream of TRPML1 that opposes the Ca²⁺-driven pro-fusion arm.","evidence":"Co-IP of STX17/VAMP8, TRPML1 agonist/antagonist, zinc chelation, autophagy flux in vitro and xenograft models","pmids":["33890549"],"confidence":"High","gaps":["How cells resolve the opposing Ca²⁺ (pro-fusion) and Zn²⁺ (anti-fusion) signals from the same channel","Zinc concentration thresholds in vivo"]},{"year":2022,"claim":"Cryo-EM capture of PI(3,5)P₂ and temsirolimus co-bound states revealed synergistic cooperative gating where two distinct ligand sites must be occupied for full channel opening.","evidence":"Cryo-EM of apo-closed, PI(3,5)P₂-bound closed, and PI(3,5)P₂/temsirolimus-bound open states with electrophysiology","pmids":["35131932"],"confidence":"High","gaps":["Whether endogenous co-agonists occupy the temsirolimus site","Structural basis of cooperativity at atomic detail"]},{"year":2022,"claim":"Identification of LAMTOR1 as a direct tonic inhibitor of TRPML1 that modulates calcineurin-dependent GluA1 degradation and synaptic plasticity placed TRPML1 in neuronal signaling circuitry.","evidence":"Co-IP, domain mapping, GCaMP3 Ca²⁺ imaging in hippocampal neurons, synaptic plasticity recordings, behavioral assays","pmids":["35099830"],"confidence":"High","gaps":["Whether LAMTOR1 inhibition is regulated by nutrient status independently of mTORC1","Specificity for GluA1 versus other synaptic substrates"]},{"year":2022,"claim":"Mapping the oxidative-stress-induced TRPML1→CaMK2G→JIP4-pT217 axis for lysosomal retrograde transport distinguished it from the starvation-induced pathway and identified JIP4 phosphorylation as a context-specific switch.","evidence":"JIP4/TRPML1/ALG2 genetic KO and rescue, phospho-site mapping, CaMK2G inhibition, lysosome positioning imaging","pmids":["36394115"],"confidence":"High","gaps":["Whether other kinases can substitute for CaMK2G","Integration with TFEB-dependent transcriptional response"]},{"year":2024,"claim":"Discovery that AKT phosphorylates TRPML1 at S343 to block ubiquitination and promote ARL8B-dependent lysosomal exocytosis for ferroptosis resistance connected TRPML1 to oncogenic survival signaling.","evidence":"CRISPR screen, kinase inhibitor library, phospho-site mapping, co-IP of TRPML1–ARL8B, ubiquitination and exocytosis assays, in vivo tumor models","pmids":["38924427"],"confidence":"High","gaps":["Identity of the E3 ligase targeting K552","Whether AKT-TRPML1 axis operates in non-cancer contexts"]},{"year":2024,"claim":"Demonstrating that TRPML1 activation promotes SNARE carrier vesicle delivery (STX7, VAMP7) to lysosomes in a positive feedback with PI(3,5)P₂ generation resolved how TRPML1 rapidly activates lysosomal acidification and hydrolase function.","evidence":"ML-SA1 activation, pH imaging, hydrolase activity assays, SNARE trafficking analysis with kinetic measurements","pmids":["39433126"],"confidence":"High","gaps":["Origin of the SNARE carrier vesicles","Whether PI(3,5)P₂ positive feedback is self-limiting"]},{"year":2025,"claim":"Identification of a TRPML1→Fe²⁺→PHD→NF-κB axis that suppresses IL-1β transcription in macrophages established an anti-inflammatory role for lysosomal iron release and demonstrated in vivo therapeutic potential in colitis.","evidence":"TRPML1 agonist/antagonist, Fe²⁺ release assays, PHD activity, NF-κB reporter, IL-1β quantification, TRPML1 KO, DSS-colitis mouse model","pmids":["39856099"],"confidence":"High","gaps":["Whether other lysosomal channels contribute to this anti-inflammatory Fe²⁺ release","Long-term consequences of modulating lysosomal iron for systemic iron homeostasis"]},{"year":null,"claim":"Key unresolved questions include the direct ROS-sensing site on TRPML1, how opposing Ca²⁺ (pro-fusion) and Zn²⁺ (anti-fusion) signals from the same channel are decoded by cells, the identity of tethering factors at TRPML1-dependent organelle contact sites, and whether disease-associated mutant structures can inform targeted therapies for mucolipidosis IV.","evidence":"","pmids":[],"confidence":"Low","gaps":["No cryo-EM structure of a disease-causing TRPML1 mutant","Direct ROS-binding site unidentified","Mechanism coordinating Ca²⁺ and Zn²⁺ dual signaling unknown","Tethering partners at lysosome–mitochondria contacts for TRPML1-dependent Ca²⁺ transfer not identified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,6,7,8,27]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,6,7,8,9,12,24,27]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,8]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[1,10,14,24,31]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[8,12,16,31,34]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[13,15,16,25]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,17,32]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[12,30]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[1,22,24]}],"complexes":["TRPML1 homotetramer","TRPML1-TRPML2 heteromultimer","TRPML1-RyR2 nanoscale complex"],"partners":["TRPML2","TRPML3","ARL8B","LAMTOR1","TMEM163","STIM1","RYR2","ALG2"],"other_free_text":[]},"mechanistic_narrative":"MCOLN1 encodes TRPML1, a lysosomal non-selective cation channel that releases Ca²⁺, Fe²⁺, and Zn²⁺ from late endosomes and lysosomes to regulate membrane trafficking, organelle homeostasis, and cellular signaling. Activated by PI(3,5)P₂ binding to transmembrane helices S1–S3 via an allosteric S4–S5 linker mechanism and by reactive oxygen species, TRPML1 is inhibited by mTORC1-mediated phosphorylation and tonically suppressed by LAMTOR1; its Ca²⁺ release drives calcineurin-dependent TFEB nuclear translocation for autophagy/lysosome biogenesis, CaMKKβ/AMPK/VPS34-dependent autophagosome biogenesis, calmodulin-dependent lysosome fission, ARL8B-dependent lysosomal exocytosis, phagosome–lysosome fusion, SNARE-mediated autophagosome–lysosome fusion, and mitochondrial Ca²⁺ transfer at organelle contact sites [PMID:18794901, PMID:27357649, PMID:30305615, PMID:29460684, PMID:35099830, PMID:31822666, PMID:26010303, PMID:28360104, PMID:38924427, PMID:32703809, PMID:33890549]. Cryo-EM structures in multiple gating states reveal that PI(3,5)P₂ induces a π-cation interaction (Y355–R403) that moves the S4–S5 linker to open a lower gate formed by S5/S6/PH1, while a luminal polycation trap and Ca²⁺-blocking acidic residues confer pH- and divalent-cation selectivity [PMID:29019981, PMID:29019983, PMID:30305615, PMID:35131932]. Loss-of-function mutations in MCOLN1 cause mucolipidosis type IV, characterized by lysosomal iron and zinc accumulation, over-acidification, defective membrane trafficking, and impaired autophagy [PMID:18794901, PMID:16361256, PMID:20864526, PMID:25119295]."},"prefetch_data":{"uniprot":{"accession":"Q9GZU1","full_name":"Mucolipin-1","aliases":["MG-2","Mucolipidin","Transient receptor potential channel mucolipin 1","TRPML1"],"length_aa":580,"mass_kda":65.0,"function":"Nonselective cation channel probably playing a role in the regulation of membrane trafficking events and of metal homeostasis (PubMed:11013137, PubMed:12459486, PubMed:14749347, PubMed:15336987, PubMed:18794901, PubMed:25720963, PubMed:27623384, PubMed:29019983). Acts as a Ca(2+)-permeable cation channel with inwardly rectifying activity (PubMed:25720963, PubMed:29019983). Proposed to play a major role in Ca(2+) release from late endosome and lysosome vesicles to the cytoplasm, which is important for many lysosome-dependent cellular events, including the fusion and trafficking of these organelles, exocytosis and autophagy (PubMed:11013137, PubMed:12459486, PubMed:14749347, PubMed:15336987, PubMed:25720963, PubMed:27623384, PubMed:29019983). Required for efficient uptake of large particles in macrophages in which Ca(2+) release from the lysosomes triggers lysosomal exocytosis. May also play a role in phagosome-lysosome fusion (By similarity). Involved in lactosylceramide trafficking indicative for a role in the regulation of late endocytic membrane fusion/fission events (PubMed:16978393). By mediating lysosomal Ca(2+) release is involved in regulation of mTORC1 signaling and in mTOR/TFEB-dependent lysosomal adaptation to environmental cues such as nutrient levels (PubMed:25720963, PubMed:25733853, PubMed:27787197). Seems to act as lysosomal active oxygen species (ROS) sensor involved in ROS-induced TFEB activation and autophagy (PubMed:27357649). Also functions as a Fe(2+) permeable channel in late endosomes and lysosomes (PubMed:18794901). Also permeable to Mg(2+), Na(+). K(+) and Cs(+) (By similarity). Proposed to play a role in zinc homeostasis probably implicating its association with TMEM163 (PubMed:25130899) In adaptive immunity, TRPML2 and TRPML1 may play redundant roles in the function of the specialized lysosomes of B cells (By similarity) May contribute to cellular lipase activity within the late endosomal pathway or at the cell surface which may be involved in processes of membrane reshaping and vesiculation, especially the growth of tubular structures. However, it is not known, whether it conveys the enzymatic activity directly, or merely facilitates the activity of an associated phospholipase","subcellular_location":"Late endosome membrane; Lysosome membrane; Cytoplasmic vesicle membrane; Cell projection, phagocytic cup; Cytoplasmic vesicle, phagosome membrane; Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9GZU1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MCOLN1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000090674","cell_line_id":"CID001658","localizations":[{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"MCOLN2","stoichiometry":0.2},{"gene":"C6ORF106","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001658","total_profiled":1310},"omim":[{"mim_id":"620763","title":"CORNEAL DYSTROPHY, LISCH EPITHELIAL; LECD","url":"https://www.omim.org/entry/620763"},{"mim_id":"618978","title":"TRANSMEMBRANE PROTEIN 163; TMEM163","url":"https://www.omim.org/entry/618978"},{"mim_id":"608179","title":"CAYTAXIN; ATCAY","url":"https://www.omim.org/entry/608179"},{"mim_id":"607400","title":"MUCOLIPIN 3; MCOLN3","url":"https://www.omim.org/entry/607400"},{"mim_id":"607399","title":"MUCOLIPIN 2; MCOLN2","url":"https://www.omim.org/entry/607399"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MCOLN1"},"hgnc":{"alias_symbol":["TRPML1","ML4","MLIV","MST080","MSTP080","TRPM-L1"],"prev_symbol":[]},"alphafold":{"accession":"Q9GZU1","domains":[{"cath_id":"-","chopping":"106-198_220-282","consensus_level":"high","plddt":90.6236,"start":106,"end":282},{"cath_id":"1.20.120","chopping":"63-83_294-407","consensus_level":"high","plddt":89.3101,"start":63,"end":407},{"cath_id":"1.10.287","chopping":"414-527","consensus_level":"high","plddt":91.4214,"start":414,"end":527}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZU1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZU1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZU1-F1-predicted_aligned_error_v6.png","plddt_mean":81.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MCOLN1","jax_strain_url":"https://www.jax.org/strain/search?query=MCOLN1"},"sequence":{"accession":"Q9GZU1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9GZU1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9GZU1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZU1"}},"corpus_meta":[{"pmid":"18794901","id":"PMC_18794901","title":"The type IV mucolipidosis-associated protein TRPML1 is an endolysosomal iron release channel.","date":"2008","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/18794901","citation_count":477,"is_preprint":false},{"pmid":"27357649","id":"PMC_27357649","title":"MCOLN1 is a ROS sensor in lysosomes that regulates autophagy.","date":"2016","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/27357649","citation_count":459,"is_preprint":false},{"pmid":"32703809","id":"PMC_32703809","title":"Mitochondria-lysosome contacts regulate mitochondrial Ca2+ dynamics via lysosomal TRPML1.","date":"2020","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/32703809","citation_count":251,"is_preprint":false},{"pmid":"20074572","id":"PMC_20074572","title":"Mucolipins: Intracellular TRPML1-3 channels.","date":"2010","source":"FEBS 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to TRPML1 mutant isoforms responsible for mucolipidosis type IV.","date":"2014","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/25119295","citation_count":138,"is_preprint":false},{"pmid":"34878954","id":"PMC_34878954","title":"Autophagy inhibition mediated by MCOLN1/TRPML1 suppresses cancer metastasis via regulating a ROS-driven TP53/p53 pathway.","date":"2021","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/34878954","citation_count":129,"is_preprint":false},{"pmid":"29019983","id":"PMC_29019983","title":"Human TRPML1 channel structures in open and closed conformations.","date":"2017","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/29019983","citation_count":124,"is_preprint":false},{"pmid":"16257972","id":"PMC_16257972","title":"TRP-ML1 is a lysosomal monovalent cation channel that undergoes proteolytic cleavage.","date":"2005","source":"The Journal of biological 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ML4 disease mutations impair Fe2+ permeation to varying degrees correlating with disease severity. Loss of TRPML1 results in reduced cytosolic Fe2+ and increased intralysosomal Fe2+.\",\n      \"method\": \"Radiolabelled iron uptake, cytosolic/intralysosomal iron monitoring, direct lysosomal patch-clamp electrophysiology, comparison of TRPML1−/− vs. control fibroblasts\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods including direct patch-clamp of lysosomal membrane and ion flux assays in patient cells\",\n      \"pmids\": [\"18794901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRPML1 acts as a ROS sensor on the lysosomal membrane; oxidants directly and specifically activate TRPML1, inducing lysosomal Ca2+ release that triggers calcineurin-dependent TFEB nuclear translocation, autophagy induction, and lysosome biogenesis. Genetic inactivation or pharmacological inhibition of TRPML1 blocks clearance of damaged mitochondria and removal of excess ROS.\",\n      \"method\": \"Pharmacological ROS manipulation, GCaMP3 lysosomal Ca2+ imaging, TFEB nuclear translocation assays, genetic knockout/knockdown with autophagic flux readouts\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Ca2+ imaging, TFEB translocation, KO phenotype), strong mechanistic chain\",\n      \"pmids\": [\"27357649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structure of mouse TRPML1 in nanodiscs reveals that PI(3,5)P2 binds to the N-terminus distal from the pore; an S2-S3 helix-turn-helix extension couples ligand binding to pore opening; the selectivity filter has multiple ion-binding sites; conserved acidic residues form a luminal Ca2+-blocking site conferring pH/Ca2+ modulation; a luminal linker domain forms a fenestrated canopy creating a divalent cation-preferring electrostatic trap.\",\n      \"method\": \"Single-particle cryo-EM in nanodiscs, mutagenesis analysis, electrophysiology\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure combined with mutagenesis and functional validation\",\n      \"pmids\": [\"29019981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structures of full-length human TRPML1 in apo (closed, pH 7.0) and agonist-bound (open, pH 6.0) states reveal that channel opening involves dilation of a lower gate together with movement of pore helix 1; a hydrophobic cavity formed by S5, S6, and PH1 houses the synthetic agonist, distinct from TRPV1 binding site.\",\n      \"method\": \"Single-particle cryo-EM at 3.49–3.72 Å resolution\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — near-atomic resolution cryo-EM of both open and closed states\",\n      \"pmids\": [\"29019983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Structural basis for PI(3,5)P2 and PI(4,5)P2 regulation: both lipids bind to extended helices of S1, S2, and S3. The phosphate group of PI(3,5)P2 induces a Y355–R403 π-cation interaction that moves the S4-S5 linker, allosterically activating the channel. PI(4,5)P2 acts as an inhibitor via the same site.\",\n      \"method\": \"Cryo-EM structures of human TRPML1 at pH 5.0 with PI(3,5)P2, PI(4,5)P2, or ML-SA1+PI(3,5)P2; electrophysiology\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — atomic-resolution structures with distinct ligands combined with electrophysiological validation\",\n      \"pmids\": [\"30305615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of mouse TRPML1 in apo-closed, PI(3,5)P2-bound closed, and PI(3,5)P2/temsirolimus-bound open states reveal synergistic activation: PI(3,5)P2 binds N-terminal domain and rapamycin analog binds a distinct site; together they cooperate to fully open the channel.\",\n      \"method\": \"Cryo-EM structural determination in multiple states, patch-clamp electrophysiology\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple cryo-EM states with electrophysiology revealing cooperative gating mechanism\",\n      \"pmids\": [\"35131932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Loss of TRPML1 causes lysosomal over-acidification; TRPML1 can function as a H+ channel providing a proton leak that limits lysosomal acidification. Over-acidification in TRPML1−/− cells reduces lysosomal lipase activity; restoring normal pH with nigericin or chloroquine rescues the lysosomal storage phenotype.\",\n      \"method\": \"Lysosomal pH measurement, H+ channel recording, lipase activity assay in TRPML1−/− patient cells, rescue experiments with ionophores\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct pH and channel measurements in patient-derived KO cells with functional rescue\",\n      \"pmids\": [\"16361256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TRPML1 is a lysosomal monovalent cation channel that undergoes proteolytic cleavage by cathepsin B at Arg200-Pro201; cleavage inactivates channel activity. N- and C-terminal fragments co-immunoprecipitate and co-elute, indicating they remain associated after cleavage.\",\n      \"method\": \"Planar patch-clamp electrophysiology, N-terminal sequencing, co-immunoprecipitation, expression in cathepsin B-deficient cells, inhibitor studies\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted channel activity, identified cleavage site by N-terminal sequencing, functional inactivation demonstrated\",\n      \"pmids\": [\"16257972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Proline-scanning mutagenesis of the TM5 region identifies gain-of-function (GOF) mutations causing constitutive Ca2+ permeability. GOF TRPML1 channels traffic beyond late endosomes/lysosomes to the plasma membrane because constitutive intralysosomal Ca2+ release triggers lysosomal exocytosis. TRPML1 is an inwardly rectifying, proton-impermeable, Ca2+/Fe2+/Mn2+-permeable channel gated via conformational change at the cytoplasmic face of TM5.\",\n      \"method\": \"Proline scanning mutagenesis, whole-cell and lysosomal patch-clamp, surface LAMP-1 staining, subcellular localization by fluorescence microscopy\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — systematic mutagenesis with direct electrophysiology and localization readouts\",\n      \"pmids\": [\"19638346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TRPML proteins form homo- and heteromultimers. TRPML1 and TRPML2 are lysosomal homomultimers and dictate lysosomal localization of TRPML3 (which alone resides in the ER) through heteromultimerization.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization by fluorescence microscopy, disruption of lysosomal targeting signals\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with localization rescue experiments establishing hierarchy\",\n      \"pmids\": [\"16606612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRPML1 activation triggers autophagosome biogenesis via lysosomal Ca2+ release activating CaMKKβ and AMPK, which increase activation of ULK1 and VPS34 autophagic complexes and PI3P generation, independently of TFEB. MLIV patient cells show reduced recruitment of PI3P-binding proteins to the phagophore.\",\n      \"method\": \"Pharmacological activation/inhibition of TRPML1, CaMKKβ/AMPK/ULK1/VPS34 biochemical assays, PI3P biosensor imaging, MLIV patient fibroblast analysis\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal pathway assays with genetic/pharmacological perturbations and disease cell validation\",\n      \"pmids\": [\"31822666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRPML1-mediated lysosomal Ca2+ release at mitochondria-lysosome contact sites promotes calcium transfer to mitochondria, dependent on tethering of contact sites and requiring VDAC1 and the mitochondrial calcium uniporter. MLIV patient fibroblasts show altered contact dynamics and defective contact-dependent mitochondrial calcium uptake.\",\n      \"method\": \"High-resolution live-cell microscopy, organelle Ca2+ imaging, contact site analysis, MLIV patient fibroblast studies\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct imaging of contact sites with functional Ca2+ transfer assays and disease model validation\",\n      \"pmids\": [\"32703809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRPML1 is a PI(3,5)P2-gated lysosomal Ca2+ channel required for phagosome-lysosome fusion in macrophages. PIKfyve synthesizes PI(3,5)P2 to activate TRPML1, and the resulting Ca2+ release drives membrane fusion. Silencing TRPML1 causes lysosomes to dock but not fuse with phagosomes; forcible Ca2+ release rescues maturation.\",\n      \"method\": \"TRPML1 siRNA knockdown, PIKfyve pharmacological inhibition, phagosome isolation, lysosomal marker acquisition assays, ionomycin rescue, cytosolic Ca2+ measurement\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic and pharmacological perturbations with mechanistic rescue experiments\",\n      \"pmids\": [\"26010303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"mTORC1 (TOR kinase) directly phosphorylates TRPML1 to inactivate the channel. Mutating TOR phosphorylation sites to unphosphorylatable residues blocks TOR-mediated TRPML1 regulation. Conversely, starvation relieves mTORC1-mediated inhibition of TRPML1, and activated TRPML1 then reactivates mTORC1 via calmodulin in a negative feedback loop.\",\n      \"method\": \"Phosphorylation site mutagenesis, kinase inhibition, mTORC1 activity assays, TRPML1 channel electrophysiology, calmodulin inhibition\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct phosphorylation by TOR with mutagenesis confirmation and functional channel/signaling readouts\",\n      \"pmids\": [\"29460684\", \"26195823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRPML1 mediates lysosomal Zn2+ release into the cytosol. Activation of TRPML1 by agonists blocks autophagosome-lysosome fusion by disrupting interaction of STX17 (autophagosome SNARE) with VAMP8 (lysosome SNARE), thereby arresting autophagic flux. This zinc-dependent block of SNARE-mediated fusion is replicated by extracellular zinc, confirming zinc as the effector.\",\n      \"method\": \"TRPML1 agonist/antagonist pharmacology, zinc chelation, co-immunoprecipitation of STX17/VAMP8, autophagy flux assays, xenograft tumor models\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP demonstrating SNARE disruption by zinc, multiple cell types and in vivo validation\",\n      \"pmids\": [\"33890549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRPML1 maintains oncogenic HRAS in signaling-competent nanoclusters at the plasma membrane by mediating cholesterol de-esterification and transport from endolysosomes to the plasma membrane. TRPML1 inhibition causes cholesterol accumulation in endolysosomes, loss of HRAS from the plasma membrane, and reduced ERK phosphorylation.\",\n      \"method\": \"MCOLN1 knockdown and pharmacological inhibition, cholesterol localization imaging, HRAS nanoclustering analysis, ERK phosphorylation assays\",\n      \"journal\": \"EMBO Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic chain from TRPML1 to cholesterol transport to HRAS signaling with multiple readouts\",\n      \"pmids\": [\"30787043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AKT directly phosphorylates TRPML1 at Ser343, which inhibits K552 ubiquitination and proteasomal degradation of TRPML1, thereby promoting TRPML1 binding to ARL8B and triggering lysosomal exocytosis. This TRPML1-mediated exocytosis reduces intracellular ferrous iron and enhances membrane repair, protecting AKT-hyperactivated cancer cells from ferroptosis.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen, kinase inhibitor library screen, phosphorylation site mapping, co-IP of TRPML1-ARL8B, ubiquitination assays, lysosomal exocytosis assays, in vivo tumor models\",\n      \"journal\": \"Science Translational Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — CRISPR screen plus direct phosphorylation mapping with mechanistic co-IP and in vivo validation\",\n      \"pmids\": [\"38924427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Loss of TRPML1 causes intracellular chelatable zinc dyshomeostasis with zinc accumulation in lysosomes and elevated brain zinc in TRPML1−/− mice, establishing a role for TRPML1 in zinc efflux from lysosomes.\",\n      \"method\": \"siRNA knockdown in HEK-293 cells, spectrofluorometric zinc quantification in MLIV patient fibroblasts, ICP-MS on TRPML1−/− mouse brain tissue\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — complementary cell and in vivo zinc quantification with KO mouse model\",\n      \"pmids\": [\"20864526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TRPML1 interacts with TMEM163 (a putative zinc transporter) as demonstrated by yeast two-hybrid, co-immunoprecipitation, mass spectrometry, and confocal colocalization. This interaction modulates cellular zinc homeostasis; TMEM163 plasma membrane levels decrease when co-expressed with TRPML1, and knockdown of TMEM163 or combined TMEM163/TRPML1 knockdown elevates intracellular zinc.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, mass spectrometry, confocal microscopy, siRNA knockdown, zinc quantification\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal interaction assays with functional zinc homeostasis readout\",\n      \"pmids\": [\"25130899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRPML1 is required for parietal cell membrane trafficking: it is dynamically palmitoylated and dephosphorylated following histamine stimulation of acid secretion. Loss of TRPML1 reduces levels and mislocalizes the gastric proton pump, alters secretory canaliculi, and causes hypochlorhydria; this indicates TRPML1 functions in tubulovesicle formation and trafficking.\",\n      \"method\": \"Trpml1−/− mouse model, histology, ultrastructural analysis, biochemical analyses of proton pump levels and localization, palmitoylation/phosphorylation assays, gastric acid secretion measurements\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with ultrastructural, biochemical, and physiological readouts; palmitoylation identified as PTM\",\n      \"pmids\": [\"21111738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Acute siRNA-mediated loss of TRPML1 causes cathepsin B (CatB) leak from lysosomes into the cytoplasm, triggering Bax-dependent apoptosis. CatB inhibition prevents apoptosis; Bax inhibition prevents apoptosis but not CatB leak, placing CatB leak upstream of Bax activation.\",\n      \"method\": \"siRNA knockdown, cathepsin B activity/localization assays, apoptosis assays, CatB inhibitor pharmacology, Bax inhibition\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KD with epistatic pharmacological dissection of CatB-Bax pathway\",\n      \"pmids\": [\"22262857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRPML1 channels in late endosomes/lysosomes of vascular smooth muscle cells form stable nanoscale complexes with type 2 ryanodine receptors (RyR2) on the sarcoplasmic reticulum. TRPML1-mediated Ca2+ release initiates RyR2-dependent Ca2+ sparks that activate BK channels; loss of TRPML1 abolishes Ca2+ sparks, renders arteries hypercontractile, and causes spontaneous hypertension in Mcoln1−/− mice.\",\n      \"method\": \"TRPML1-KO mice, super-resolution microscopy (nanoscale colocalization), live-cell confocal Ca2+ imaging, ex vivo pressure myography, in vivo radiotelemetry\",\n      \"journal\": \"Science Signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with super-resolution structural evidence, functional Ca2+ imaging, and in vivo blood pressure measurement\",\n      \"pmids\": [\"32576680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRPML1-mediated lysosomal Ca2+ release activates calmodulin (CaM) to promote lysosome fission/size regulation. Activation of TRPML1 suppresses vacuolin-1- or P2X4-induced lysosomal enlargement; this effect requires Ca2+ and CaM, not the lysosomal Na+ channel TPC2.\",\n      \"method\": \"TRPML1 overexpression/activation, vacuolin-1 and P2X4 treatment, Ca2+ chelation, CaM inhibition, lysosome size quantification\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological and genetic dissection with specific pathway requirements demonstrated\",\n      \"pmids\": [\"28360104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Although TRPML1 and TPC2 co-immunoprecipitate and colocalize, they function as independent ion channels: TPC1/TPC2 do not affect TRPML1 channel activity, and TRPML1 does not mediate NAADP-evoked Ca2+ signals (NAADP-Ca2+ responses are identical in wild-type and TRPML1−/− cells). TPCs, not TRPMLs, are the NAADP targets.\",\n      \"method\": \"Co-immunoprecipitation, colocalization, patch-clamp of TRPML1 and TPC channels, NAADP-Ca2+ measurement in TRPML1−/− cells and pancreatic acinar cells\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct channel recordings combined with genetic KO cells definitively separating TRPML1 from NAADP pathway\",\n      \"pmids\": [\"21540176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CUP-5, the C. elegans ortholog of TRPML1, localizes to lysosomes (not gut granules) and is required for lysosome biogenesis and proteolytic degradation in autolysosomes. cup-5 mutations cause enlarged autolysosomes with defective degradation; reduced autophagy activity partially suppresses cup-5 mutant phenotypes.\",\n      \"method\": \"C. elegans genetics, autophagy substrate accumulation assays, organelle marker colocalization, genetic epistasis with autophagy mutants\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ortholog with genetic epistasis and defined lysosomal localization with functional consequence\",\n      \"pmids\": [\"21997367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LAMTOR1 (Ragulator subunit) directly interacts with TRPML1 through its N-terminal domain and tonically inhibits TRPML1 activity independently of mTORC1. Disrupting LAMTOR1-TRPML1 binding increases TRPML1-mediated Ca2+ release, activates calcineurin-dependent GluA1 dephosphorylation, promotes lysosomal degradation of GluA1, and impairs synaptic plasticity and memory in mice.\",\n      \"method\": \"Co-immunoprecipitation, LAMTOR1 deletion/domain mapping, GCaMP3 Ca2+ imaging in hippocampal neurons, dendritic lysosome trafficking imaging, synaptic plasticity recordings, behavioral assays\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction mapping with multiple functional readouts from molecular to behavioral level\",\n      \"pmids\": [\"35099830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structure of human TRPML1 with antagonist ML-SI3 at 2.9-Å resolution reveals that ML-SI3 binds to the same hydrophobic S5/S6/PH1 cavity as agonist ML-SA1. ML-SI3 competes with ML-SA1 but does not block PI(3,5)P2-dependent activation, demonstrating two functionally distinct activation pathways.\",\n      \"method\": \"Cryo-EM, whole-lysosome electrophysiology, competitive binding studies\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — near-atomic resolution structure with electrophysiological functional validation\",\n      \"pmids\": [\"34171299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRPML1 mediates lysosomal Ca2+ release in response to the synthetic agonist ML-SA1 and the endogenous ligand PI(3,5)P2. F465L mutation renders TRPML1 pH-insensitive; F408Δ impacts synthetic ligand binding. Small-molecule activators can restore TRPML1 mutant channel function and rescue trafficking defects and lysosomal zinc accumulation in MLIV patient fibroblasts.\",\n      \"method\": \"Whole-lysosome planar patch-clamp, MLIV patient fibroblast studies, zinc accumulation assays, trafficking assays\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct lysosomal patch-clamp with mutant characterization and functional disease-relevant rescue\",\n      \"pmids\": [\"25119295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Oxidative stress-induced phosphorylation of JIP4 at T217 by CaMK2G in response to TRPML1-mediated Ca2+ fluxes regulates lysosomal retrograde transport and clustering. TRPML1-ALG2 pathway operates downstream, and the phosphorylation status of JIP4 acts as a switch between oxidative-stress-induced versus starvation-induced lysosomal retrograde transport.\",\n      \"method\": \"JIP4/TRPML1/ALG2 genetic KO and rescue, acrolein/H2O2 treatment, phosphorylation site mapping (T217), CaMK2G inhibition, lysosome positioning imaging\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with phosphorylation site identification and multiple pathway readouts\",\n      \"pmids\": [\"36394115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Acid ceramidase (AC) product sphingosine activates TRPML1 channel-mediated Ca2+ release; ceramide and sphingomyelin have different modulatory effects on TRPML1 in podocytes. AC inhibition attenuates TRPML1 activity. TRPML1-mediated Ca2+ release controls lysosome-multivesicular body interaction and suppresses exosome release.\",\n      \"method\": \"Port-a-Patch planar patch-clamp, GCaMP3 Ca2+ imaging, AC inhibitor carmofur, structured illumination microscopy of lysosome-MVB interactions, nanoparticle tracking for exosomes\",\n      \"journal\": \"American Journal of Physiology – Cell Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct channel recordings with lipid modulators and functional membrane trafficking readouts\",\n      \"pmids\": [\"31268777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRPML1 is activated secondarily to ROS elevation upon inflammatory stimuli, mediating release of lysosomal Fe2+ into the cytosol. Released Fe2+ activates prolyl hydroxylase domain enzymes (PHDs), which then suppress NF-κB transcriptional activity, resulting in inhibited IL-1β (IL1B) transcription in macrophages. In vivo TRPML1 stimulation ameliorates colitis.\",\n      \"method\": \"TRPML1 agonist/antagonist pharmacology, Fe2+ release assays, PHD activity measurement, NF-κB reporter assays, IL-1β quantification, TRPML1 KO and siRNA, DSS-colitis mouse model\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic chain from TRPML1 to Fe2+ to PHDs to NF-κB with in vivo validation\",\n      \"pmids\": [\"39856099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRPML1 activation promotes autophagosome-lysosome fusion through Ca2+-dependent delivery of lysosomal SNARE proteins (syntaxin 7, VAMP7) via SNARE carrier vesicles, thereby activating lysosomal acidification and hydrolase activity within 10–20 min of TRPML1 activation. Incoming vesicle fusion is a prerequisite that generates PI(3,5)P2 to activate TRPML1 in a positive feedback.\",\n      \"method\": \"Pharmacological TRPML1 activation (ML-SA1), pH imaging, hydrolase activity assays, SNARE trafficking analysis, autophagy flux measurements\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic dissection with SNARE trafficking readouts and kinetic experiments\",\n      \"pmids\": [\"39433126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"siRNA-induced TRPML1 knockdown leads to lysosomal enlargement and zinc accumulation when cells are exposed to high zinc; this is ameliorated by knockdown of zinc-sensitive transcription factor MTF-1 or zinc transporter ZnT4. TRPML1 knockdown delays zinc leak from lysosomes to cytoplasm, and elevated cytoplasmic zinc drives MT2a transcription.\",\n      \"method\": \"siRNA knockdown, zinc staining (LysoTracker/zinc fluorophore), MTF-1 and ZnT4 co-knockdown epistasis, lysosomal secretion assays, mRNA quantification\",\n      \"journal\": \"Biochemical Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with functional zinc trafficking readouts\",\n      \"pmids\": [\"23368743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRPML1 co-immunoprecipitates with the ER Ca2+ sensor STIM1 in motor neurons. STIM1 is required for TRPML1-mediated Ca2+ release; loss of STIM1 abolishes ML-SA1 and PI(3,5)P2-induced Ca2+ efflux through TRPML1. TRPML1 co-localizes with ER marker and LAMP1 in motor neurons.\",\n      \"method\": \"Co-immunoprecipitation, GCaMP3-ML1 Ca2+ indicator, siRNA knockdown, confocal colocalization in motor neurons\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with functional Ca2+ imaging; single lab study\",\n      \"pmids\": [\"33484198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TLR3 activation triggers lysosomal alkalization, which activates TRPML1, leading to lysosomal ATP and acid phosphatase release (lysosomal exocytosis) in astrocytes and RPE cells. TRPML1 agonist ML-SA1 is sufficient to trigger this release; TRPML1-KO cells show blunted poly(I:C)-dependent ATP release.\",\n      \"method\": \"TRPML1-KO cells, ML-SA1 agonist, ATP/acid phosphatase release assays, lysosomal pH measurement, TBK-1 inhibition\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO cells with agonist/inhibitor pharmacology and multiple release readouts; single lab\",\n      \"pmids\": [\"29636491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TRPML1 channels in bladder and urethral smooth muscle cells form nanoscale complexes with RyR2 on the sarcoplasmic reticulum, similar to vascular SMCs. Loss of TRPML1 in Mcoln1−/− mice impairs Ca2+ sparks and BK channel activity, rendering lower urinary tract smooth muscle hypercontractile and causing bladder overactivity.\",\n      \"method\": \"Mcoln1−/− mouse, lattice light-sheet microscopy, super-resolution colocalization, Ca2+ spark imaging, BK channel electrophysiology, ex vivo contractility, voiding assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with super-resolution structural evidence and multiple functional readouts across organ systems\",\n      \"pmids\": [\"33199609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRPML1-mediated lysosomal exocytosis is required for adipogenesis. TRPML1 expression increases during adipogenic differentiation; acute TRPML1 deletion reduces lipid synthesis, marker gene expression, and exosome release from mature adipocytes.\",\n      \"method\": \"TRPML1 deletion in OP9 pre-adipocytes, lipid synthesis assays, differentiation marker gene expression, exosome quantification\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic deletion with multiple functional readouts; single lab\",\n      \"pmids\": [\"30711251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Lysosomal adenosine accumulation (from ADA deficiency) inhibits TRPML1 channel activity; overexpressing ENT3 (adenosine transporter) rescues TRPML1 activity and lysosomal function. ADA deficiency causes lysosome enlargement, alkalinization, and dysfunction that are rescued by TRPML1 activation. This mechanism links purine metabolism to lysosomal Ca2+ homeostasis.\",\n      \"method\": \"ADA-KO cells, TRPML1 electrophysiology, ENT3 overexpression rescue, lysosomal pH measurement, B-lymphocyte oxidative stress assays\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with channel-level and functional lysosomal rescue; single lab\",\n      \"pmids\": [\"28087698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Loss of TRPML1 promotes ROS production via trapped lysosomal Fe2+; TRPML1-knockdown cells exposed to Fe2+ show mitochondrial fragmentation, loss of mitochondrial membrane potential, ROS buildup, lipid peroxidation, and oxidative stress gene induction—all reversed by the ROS chelator α-tocopherol.\",\n      \"method\": \"siRNA knockdown, Fe2+ treatment, mitochondrial morphology imaging, membrane potential assays, ROS/lipid peroxidation measurement, α-tocopherol rescue\",\n      \"journal\": \"Biochemical Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic chain from TRPML1-loss to Fe2+ accumulation to ROS; single lab\",\n      \"pmids\": [\"24192042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRPML1 functions as an NAADP-sensitive lysosomal Ca2+ release channel in coronary arterial myocytes; siRNA silencing of TRPML1 reduces NAADP-activated lysosomal Ca2+ channel activity by ~71% in reconstituted lysosomal preparations, and anti-TRPML1 antibodies almost abolish NAADP-induced channel activation.\",\n      \"method\": \"siRNA knockdown, lysosomal channel reconstitution, NAADP pharmacology, FRET, intracellular Ca2+ imaging\",\n      \"journal\": \"Journal of Cellular and Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — channel reconstitution with siRNA validation; single lab, later contradicted by paper 21540176 for non-vascular cells\",\n      \"pmids\": [\"18754814\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRPML1/MCOLN1 is a non-selective, inwardly-rectifying cation channel (permeable to Ca2+, Fe2+, Zn2+, H+) localized to late endosomal/lysosomal membranes, where it is activated by PI(3,5)P2 binding to transmembrane helices S1-S3 (via an allosteric S4-S5 linker mechanism) and inhibited by mTORC1-mediated phosphorylation; upon activation, it releases Ca2+, Fe2+, and Zn2+ into the cytosol to regulate lysosomal exocytosis (via ARL8B), autophagosome-lysosome fusion (via SNARE regulation and CaMKKβ/AMPK/VPS34 signaling), lysosome fission (via calmodulin), TFEB nuclear translocation (via calcineurin), mitochondrial Ca2+ uptake at organelle contact sites, and vascular/urinary smooth muscle Ca2+ spark initiation through nanoscale RyR2 complexes, while loss of TRPML1 causes lysosomal iron and zinc accumulation, over-acidification, and defective membrane trafficking underlying mucolipidosis type IV.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MCOLN1 encodes TRPML1, a lysosomal non-selective cation channel that releases Ca²⁺, Fe²⁺, and Zn²⁺ from late endosomes and lysosomes to regulate membrane trafficking, organelle homeostasis, and cellular signaling. Activated by PI(3,5)P₂ binding to transmembrane helices S1–S3 via an allosteric S4–S5 linker mechanism and by reactive oxygen species, TRPML1 is inhibited by mTORC1-mediated phosphorylation and tonically suppressed by LAMTOR1; its Ca²⁺ release drives calcineurin-dependent TFEB nuclear translocation for autophagy/lysosome biogenesis, CaMKKβ/AMPK/VPS34-dependent autophagosome biogenesis, calmodulin-dependent lysosome fission, ARL8B-dependent lysosomal exocytosis, phagosome–lysosome fusion, SNARE-mediated autophagosome–lysosome fusion, and mitochondrial Ca²⁺ transfer at organelle contact sites [PMID:18794901, PMID:27357649, PMID:30305615, PMID:29460684, PMID:35099830, PMID:31822666, PMID:26010303, PMID:28360104, PMID:38924427, PMID:32703809, PMID:33890549]. Cryo-EM structures in multiple gating states reveal that PI(3,5)P₂ induces a π-cation interaction (Y355–R403) that moves the S4–S5 linker to open a lower gate formed by S5/S6/PH1, while a luminal polycation trap and Ca²⁺-blocking acidic residues confer pH- and divalent-cation selectivity [PMID:29019981, PMID:29019983, PMID:30305615, PMID:35131932]. Loss-of-function mutations in MCOLN1 cause mucolipidosis type IV, characterized by lysosomal iron and zinc accumulation, over-acidification, defective membrane trafficking, and impaired autophagy [PMID:18794901, PMID:16361256, PMID:20864526, PMID:25119295].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing TRPML1 as an ion channel with lysosomal pH-regulatory function resolved the question of whether the channel contributes to lysosomal acidification and how its loss causes storage disease.\",\n      \"evidence\": \"Lysosomal pH measurements and H⁺ channel recordings in TRPML1⁻/⁻ patient fibroblasts with ionophore rescue of lipase activity; parallel identification of cathepsin B cleavage at R200-P201 inactivating channel activity\",\n      \"pmids\": [\"16361256\", \"16257972\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether H⁺ permeation is physiologically relevant versus secondary to other ion fluxes\", \"Relative contribution of cleavage-mediated inactivation in vivo\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstration that TRPML1 forms homo- and heteromultimers with TRPML2/3 and dictates lysosomal targeting of the complex resolved how TRPML channel family members achieve compartment-specific localization.\",\n      \"evidence\": \"Reciprocal co-IP and localization rescue upon disruption of lysosomal targeting signals\",\n      \"pmids\": [\"16606612\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structure of heteromultimeric complexes\", \"Functional differences between homo- and heteromultimeric channels\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identifying TRPML1 as a Fe²⁺-permeable lysosomal channel whose disease mutations impair iron permeation established a direct mechanistic link between channel dysfunction and lysosomal metal accumulation in mucolipidosis IV.\",\n      \"evidence\": \"Lysosomal patch-clamp electrophysiology, radiolabeled iron uptake, and cytosolic/intralysosomal iron monitoring in TRPML1⁻/⁻ versus control fibroblasts\",\n      \"pmids\": [\"18794901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Fe²⁺ transport is direct or facilitated by co-transported ions\", \"Molecular determinants of Fe²⁺ selectivity in the pore\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Systematic proline-scanning mutagenesis of TM5 revealed that constitutive TRPML1 activation drives lysosomal exocytosis and plasma membrane trafficking, linking channel gating to membrane fusion events.\",\n      \"evidence\": \"Gain-of-function mutagenesis with patch-clamp, surface LAMP-1 staining, and subcellular localization in heterologous cells\",\n      \"pmids\": [\"19638346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the Ca²⁺ effector coupling channel opening to exocytic machinery\", \"Whether constitutive exocytosis reflects a physiological or pathological state\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrating lysosomal Zn²⁺ accumulation in TRPML1-deficient cells and mouse brain established TRPML1 as a zinc efflux channel, broadening its role beyond iron to general divalent cation homeostasis.\",\n      \"evidence\": \"siRNA knockdown, spectrofluorometric zinc quantification in MLIV fibroblasts, ICP-MS on TRPML1⁻/⁻ mouse brain; complemented by parietal cell studies showing TRPML1 palmitoylation-dependent membrane trafficking\",\n      \"pmids\": [\"20864526\", \"21111738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative Zn²⁺ versus Fe²⁺ permeability under physiological conditions\", \"Structural basis of zinc permeation\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Definitive separation of TRPML1 from the NAADP–TPC signaling axis clarified that TRPML1 and TPC channels are independent lysosomal Ca²⁺ release pathways despite physical colocalization.\",\n      \"evidence\": \"Patch-clamp recordings showing unchanged NAADP-evoked Ca²⁺ signals in TRPML1⁻/⁻ cells; co-IP confirming proximity without functional coupling\",\n      \"pmids\": [\"21540176\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRPML1 and TPCs cooperate under specific physiological stimuli\", \"Earlier report of NAADP sensitivity in coronary myocytes remains unreconciled\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that acute TRPML1 loss causes cathepsin B leakage and Bax-dependent apoptosis revealed TRPML1 as essential for lysosomal membrane integrity and connected its dysfunction to cell death pathways.\",\n      \"evidence\": \"siRNA knockdown with epistatic pharmacological dissection (CatB inhibitor, Bax inhibitor) ordering CatB leak upstream of Bax activation\",\n      \"pmids\": [\"22262857\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether lysosomal membrane permeabilization is a direct consequence of ion imbalance or secondary to trafficking defects\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of TMEM163 as a direct TRPML1 interactor that modulates zinc homeostasis, and epistatic analysis of MTF-1/ZnT4 in TRPML1-knockdown cells, built a pathway model for lysosomal zinc efflux.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, mass spectrometry, and siRNA co-knockdown epistasis with zinc quantification\",\n      \"pmids\": [\"25130899\", \"23368743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TMEM163 directly conducts Zn²⁺ or modulates TRPML1 pore properties\", \"In vivo validation of the TMEM163–TRPML1 partnership\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Characterization of ML-SA1 and PI(3,5)P₂ as direct TRPML1 agonists via lysosomal patch-clamp, and rescue of MLIV patient cell phenotypes with small-molecule activators, established the pharmacological framework for TRPML1 modulation.\",\n      \"evidence\": \"Whole-lysosome planar patch-clamp with mutant characterization (F465L, F408Δ), zinc accumulation rescue in MLIV fibroblasts\",\n      \"pmids\": [\"25119295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo therapeutic efficacy of ML-SA1 class agonists\", \"Long-term safety of chronic TRPML1 activation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showing that PIKfyve-generated PI(3,5)P₂ activates TRPML1 to drive Ca²⁺-dependent phagosome–lysosome fusion in macrophages placed TRPML1 centrally in innate immune function.\",\n      \"evidence\": \"TRPML1 siRNA, PIKfyve inhibition, phagosome isolation, lysosomal marker acquisition, ionomycin rescue\",\n      \"pmids\": [\"26010303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRPML1 is the sole PI(3,5)P₂ effector for phagosome maturation\", \"Identity of the Ca²⁺-sensitive fusion machinery downstream\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery that ROS directly activate TRPML1 to trigger calcineurin/TFEB-dependent autophagy and lysosome biogenesis established TRPML1 as a lysosomal oxidative stress sensor.\",\n      \"evidence\": \"Pharmacological ROS manipulation, GCaMP3 lysosomal Ca²⁺ imaging, TFEB nuclear translocation, KO phenotype with defective mitophagy\",\n      \"pmids\": [\"27357649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ROS binding site on TRPML1 not identified\", \"Whether ROS sensitivity is redox-dependent or mediated by lipid intermediates\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Near-atomic cryo-EM structures of TRPML1 in closed and open states revealed the pore architecture, luminal polycation trap, Ca²⁺-blocking gate, and PI(3,5)P₂ binding site, transforming mechanistic understanding from pharmacology to structure.\",\n      \"evidence\": \"Cryo-EM of mouse and human TRPML1 at 3.5–3.7 Å in nanodiscs, with mutagenesis and electrophysiology validation\",\n      \"pmids\": [\"29019981\", \"29019983\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of a disease-associated mutant\", \"Conformational transitions during ion permeation not captured\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that TRPML1-released Ca²⁺ activates calmodulin to promote lysosome fission resolved the mechanism by which TRPML1 controls lysosome size.\",\n      \"evidence\": \"TRPML1 activation/overexpression with CaM inhibition, Ca²⁺ chelation, and lysosome size quantification\",\n      \"pmids\": [\"28360104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of downstream CaM effectors mediating membrane scission\", \"How fission is coordinated with fusion events\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Structures with PI(3,5)P₂ and PI(4,5)P₂ bound revealed that both lipids share the S1–S3 binding pocket but PI(3,5)P₂ induces a Y355–R403 π-cation interaction moving the S4–S5 linker to open the channel, while PI(4,5)P₂ inhibits it—explaining compartment-specific gating.\",\n      \"evidence\": \"Cryo-EM structures of human TRPML1 at pH 5.0 with different phosphoinositides, electrophysiology\",\n      \"pmids\": [\"30305615\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of lipid exchange at the binding site in intact membranes\", \"Whether other lysosomal lipids modulate binding\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of mTORC1 as a direct kinase that phosphorylates and inhibits TRPML1, with a starvation-relief/calmodulin-dependent feedback loop, integrated TRPML1 into nutrient-sensing signaling.\",\n      \"evidence\": \"Phosphorylation site mutagenesis, mTORC1 kinase assays, TRPML1 electrophysiology, calmodulin inhibition\",\n      \"pmids\": [\"29460684\", \"26195823\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation sites on TRPML1 targeted by mTORC1 not fully mapped\", \"Whether other kinases phosphorylate the same sites\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstration that TRPML1 drives autophagosome biogenesis via CaMKKβ/AMPK/ULK1/VPS34 independently of TFEB revealed a second, parallel pro-autophagic signaling arm downstream of lysosomal Ca²⁺.\",\n      \"evidence\": \"Pharmacological TRPML1 activation/inhibition, AMPK/ULK1/VPS34 biochemical assays, PI3P biosensor imaging, MLIV patient fibroblasts\",\n      \"pmids\": [\"31822666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TFEB-dependent and AMPK-dependent arms are coordinated temporally\", \"Whether the AMPK arm operates in all cell types\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linking TRPML1 to cholesterol egress from endolysosomes and maintenance of plasma membrane HRAS nanoclusters extended TRPML1's role to lipid transport and oncogenic signaling.\",\n      \"evidence\": \"MCOLN1 knockdown and pharmacological inhibition with cholesterol imaging, HRAS nanoclustering analysis, ERK phosphorylation\",\n      \"pmids\": [\"30787043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cholesterol transport is direct or mediated by NPC1/NPC2\", \"Generality to other RAS isoforms\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Sphingosine, generated by acid ceramidase, was identified as an endogenous lipid activator of TRPML1 that controls lysosome–MVB interactions and exosome release.\",\n      \"evidence\": \"Planar patch-clamp with sphingolipids, AC inhibitor carmofur, SIM imaging of lysosome–MVB contacts, nanoparticle tracking\",\n      \"pmids\": [\"31268777\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding site for sphingosine on TRPML1 not determined\", \"In vivo relevance for exosome-dependent signaling\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Discovery of nanoscale TRPML1–RyR2 complexes at lysosome–SR junctions in smooth muscle, where TRPML1 initiates Ca²⁺ sparks that activate BK channels, established a non-canonical physiological role causing hypertension and bladder overactivity when lost.\",\n      \"evidence\": \"Super-resolution microscopy, Ca²⁺ spark imaging, BK electrophysiology, pressure myography, radiotelemetry, and voiding assays in Mcoln1⁻/⁻ mice\",\n      \"pmids\": [\"32576680\", \"33199609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of TRPML1–RyR2 physical coupling\", \"Whether this mechanism operates in non-muscle excitable cells\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstration that TRPML1-mediated Ca²⁺ release at mitochondria–lysosome contact sites drives VDAC1/MCU-dependent mitochondrial Ca²⁺ uptake connected TRPML1 to inter-organelle calcium transfer.\",\n      \"evidence\": \"High-resolution live-cell contact site imaging, organelle-targeted Ca²⁺ indicators, MLIV patient fibroblasts\",\n      \"pmids\": [\"32703809\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of tethering proteins mediating TRPML1-proximal contacts\", \"Quantitative contribution relative to ER-mediated mitochondrial Ca²⁺ supply\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showing that TRPML1-released Zn²⁺ disrupts STX17–VAMP8 SNARE interaction to block autophagosome–lysosome fusion revealed zinc as a second messenger downstream of TRPML1 that opposes the Ca²⁺-driven pro-fusion arm.\",\n      \"evidence\": \"Co-IP of STX17/VAMP8, TRPML1 agonist/antagonist, zinc chelation, autophagy flux in vitro and xenograft models\",\n      \"pmids\": [\"33890549\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How cells resolve the opposing Ca²⁺ (pro-fusion) and Zn²⁺ (anti-fusion) signals from the same channel\", \"Zinc concentration thresholds in vivo\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Cryo-EM capture of PI(3,5)P₂ and temsirolimus co-bound states revealed synergistic cooperative gating where two distinct ligand sites must be occupied for full channel opening.\",\n      \"evidence\": \"Cryo-EM of apo-closed, PI(3,5)P₂-bound closed, and PI(3,5)P₂/temsirolimus-bound open states with electrophysiology\",\n      \"pmids\": [\"35131932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether endogenous co-agonists occupy the temsirolimus site\", \"Structural basis of cooperativity at atomic detail\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of LAMTOR1 as a direct tonic inhibitor of TRPML1 that modulates calcineurin-dependent GluA1 degradation and synaptic plasticity placed TRPML1 in neuronal signaling circuitry.\",\n      \"evidence\": \"Co-IP, domain mapping, GCaMP3 Ca²⁺ imaging in hippocampal neurons, synaptic plasticity recordings, behavioral assays\",\n      \"pmids\": [\"35099830\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LAMTOR1 inhibition is regulated by nutrient status independently of mTORC1\", \"Specificity for GluA1 versus other synaptic substrates\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mapping the oxidative-stress-induced TRPML1→CaMK2G→JIP4-pT217 axis for lysosomal retrograde transport distinguished it from the starvation-induced pathway and identified JIP4 phosphorylation as a context-specific switch.\",\n      \"evidence\": \"JIP4/TRPML1/ALG2 genetic KO and rescue, phospho-site mapping, CaMK2G inhibition, lysosome positioning imaging\",\n      \"pmids\": [\"36394115\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other kinases can substitute for CaMK2G\", \"Integration with TFEB-dependent transcriptional response\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Discovery that AKT phosphorylates TRPML1 at S343 to block ubiquitination and promote ARL8B-dependent lysosomal exocytosis for ferroptosis resistance connected TRPML1 to oncogenic survival signaling.\",\n      \"evidence\": \"CRISPR screen, kinase inhibitor library, phospho-site mapping, co-IP of TRPML1–ARL8B, ubiquitination and exocytosis assays, in vivo tumor models\",\n      \"pmids\": [\"38924427\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the E3 ligase targeting K552\", \"Whether AKT-TRPML1 axis operates in non-cancer contexts\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrating that TRPML1 activation promotes SNARE carrier vesicle delivery (STX7, VAMP7) to lysosomes in a positive feedback with PI(3,5)P₂ generation resolved how TRPML1 rapidly activates lysosomal acidification and hydrolase function.\",\n      \"evidence\": \"ML-SA1 activation, pH imaging, hydrolase activity assays, SNARE trafficking analysis with kinetic measurements\",\n      \"pmids\": [\"39433126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Origin of the SNARE carrier vesicles\", \"Whether PI(3,5)P₂ positive feedback is self-limiting\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of a TRPML1→Fe²⁺→PHD→NF-κB axis that suppresses IL-1β transcription in macrophages established an anti-inflammatory role for lysosomal iron release and demonstrated in vivo therapeutic potential in colitis.\",\n      \"evidence\": \"TRPML1 agonist/antagonist, Fe²⁺ release assays, PHD activity, NF-κB reporter, IL-1β quantification, TRPML1 KO, DSS-colitis mouse model\",\n      \"pmids\": [\"39856099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other lysosomal channels contribute to this anti-inflammatory Fe²⁺ release\", \"Long-term consequences of modulating lysosomal iron for systemic iron homeostasis\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the direct ROS-sensing site on TRPML1, how opposing Ca²⁺ (pro-fusion) and Zn²⁺ (anti-fusion) signals from the same channel are decoded by cells, the identity of tethering factors at TRPML1-dependent organelle contact sites, and whether disease-associated mutant structures can inform targeted therapies for mucolipidosis IV.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No cryo-EM structure of a disease-causing TRPML1 mutant\", \"Direct ROS-binding site unidentified\", \"Mechanism coordinating Ca²⁺ and Zn²⁺ dual signaling unknown\", \"Tethering partners at lysosome–mitochondria contacts for TRPML1-dependent Ca²⁺ transfer not identified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 6, 7, 8, 27]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 6, 7, 8, 9, 12, 24, 27]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [1, 10, 14, 24, 31]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [8, 12, 16, 31, 34]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [13, 15, 16, 25]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 17, 32]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12, 30]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 22, 24]}\n    ],\n    \"complexes\": [\n      \"TRPML1 homotetramer\",\n      \"TRPML1-TRPML2 heteromultimer\",\n      \"TRPML1-RyR2 nanoscale complex\"\n    ],\n    \"partners\": [\n      \"TRPML2\",\n      \"TRPML3\",\n      \"ARL8B\",\n      \"LAMTOR1\",\n      \"TMEM163\",\n      \"STIM1\",\n      \"RYR2\",\n      \"ALG2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}