{"gene":"TRPM1","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2009,"finding":"TRPM1 is required for the depolarizing light response in retinal ON-bipolar cells; genetic deletion of TRPM1 abolishes chemically simulated light responses from rod bipolar cells, and TRPM1 protein localizes to the dendrites of ON-bipolar cells in mouse and macaque retina.","method":"TRPM1 knockout mouse (ERG showing loss of b-wave), whole-cell patch-clamp recording from ON-bipolar cells in retinal slices, immunofluorescent confocal microscopy, in situ hybridization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (KO ERG, patch-clamp, immunolocalization), replicated across multiple labs in the same year","pmids":["19861548"],"is_preprint":false},{"year":2009,"finding":"The long form of TRPM1 (TRPM1-L) functions as a constitutively active nonselective cation channel in ON-bipolar cells, localizes specifically to the dendritic tips of ON-bipolar cells co-localizing with mGluR6, and its activity is negatively regulated by Go in the mGluR6 cascade. TRPM1 null mice completely lose the photoresponse of ON-bipolar cells.","method":"TRPM1 null mouse ERG and patch-clamp recordings, immunolocalization with mGluR6 co-staining, heterologous expression in TRPM1-L-expressing cells with Go manipulation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — KO mouse physiology plus heterologous reconstitution, replicated across labs","pmids":["19966281"],"is_preprint":false},{"year":2009,"finding":"TRPM1 forms an endogenous ion channel current in primary human neonatal epidermal melanocytes and mouse melanoma cells; knockdown by microRNA directed against TRPM1 abolished this current. In melanoma cells, TRPM1 is prevalent in highly dynamic intracellular vesicular structures rather than at the plasma membrane.","method":"Endogenous current recording in primary melanocytes, microRNA-mediated knockdown, subcellular localization by live imaging","journal":"Science signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus knockdown plus localization, single lab","pmids":["19436059"],"is_preprint":false},{"year":2009,"finding":"TRPM1 knockdown by lentiviral shRNA in human melanocytes reduces intracellular Ca2+ levels, decreases Ca2+ uptake, reduces tyrosinase activity and intracellular melanin, establishing a role for TRPM1 in Ca2+ homeostasis and melanogenesis. p53 overexpression or UVB-induced p53 represses TRPM1 expression with concomitant decrease in Ca2+ mobilization.","method":"Lentiviral shRNA knockdown, intracellular Ca2+ measurements, tyrosinase activity assay, melanin quantification, p53 transfection and UVB treatment","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with multiple functional readouts, single lab","pmids":["19587221"],"is_preprint":false},{"year":2004,"finding":"TRPM1 (MLSN1) promoter contains four E-boxes including an M-box; a 654 bp upstream sequence containing two distal E-boxes (E3 and E4) is sufficient for melanocyte-specific transcription and is activated by the transcription factor MITF. Multiple TRPM1 polypeptide isoforms are generated by alternative splicing and proteolytic cleavage in melanocytes and melanoma cells.","method":"Promoter deletion analysis, MITF activation assay, Western blot with anti-MLSN1 antibody","journal":"Melanoma research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — deletion analysis plus Western blot, single lab, two orthogonal methods","pmids":["15577322"],"is_preprint":false},{"year":2011,"finding":"TRPM1 forms a complex with nyctalopin in vivo in the mouse retina (identified by proteomic pulldown from retinal lysates); nyctalopin also interacts with mGluR6. Disruption of mGluR6 prevents targeting of TRPM1 to the postsynaptic compartment of ON-bipolar neurons, indicating mGluR6-dependent localization of TRPM1.","method":"Proteomic search (Co-IP/pulldown from mouse retina), immunolocalization in mGluR6 knockout retina","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal pulldown plus genetic epistasis (mGluR6 KO localization), replicated and consistent with multiple other studies","pmids":["21832182"],"is_preprint":false},{"year":2012,"finding":"Gβγ dimer, but not Gαo, closes TRPM1 channels in rod bipolar cells, human epidermal melanocytes endogenously expressing TRPM1, and HEK293 cells transfected with TRPM1. Dialysis of Gβγ into cells closed TRPM1 channels; activation of an endogenous GPCR pathway releasing Gβγ without activating Go also closed TRPM1.","method":"Whole-cell patch-clamp with intracellular dialysis of Gβγ or Gαo in multiple cell types; pharmacological GPCR activation in HEK293 cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct intracellular dialysis combined with multiple cell types, orthogonal pharmacological test","pmids":["22586107"],"is_preprint":false},{"year":2011,"finding":"TRPM1 is an ion-conducting plasma membrane channel. Heterologous TRPM1 expression induces ionic conductances; TRPM1 and TRPM3 form functional heteromultimeric channels. Channels containing the pore of TRPM1 are inhibited by extracellular zinc ions at physiological concentrations, mediated by a seven-amino-acid stretch specific to the pore region of TRPM1.","method":"Heterologous expression and patch-clamp electrophysiology, mutagenesis of pore region, heteromultimer co-expression, zinc inhibition assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis identifying the zinc-inhibition determinant","pmids":["21278253"],"is_preprint":false},{"year":2011,"finding":"In mGluR6-null rod bipolar cells, the TRPM1 channel is inactive despite partial plasma membrane localization; TRPM1 immunostaining at the dendritic tips is greatly reduced in mGluR6-null retina but remains in soma and primary dendrites. Capsaicin failed to activate TRPM1 in null cells, suggesting the channel requires a complex or unknown factor to be constitutively active.","method":"Whole-cell patch-clamp in mGluR6 knockout retinal slices, capsaicin local application, immunostaining for TRPM1 and G-protein subunits","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — electrophysiology plus immunolocalization in genetic knockout, well-controlled epistasis experiment","pmids":["22131384"],"is_preprint":false},{"year":2011,"finding":"Autoantibodies in melanoma-associated retinopathy (MAR) target TRPM1 cation channels of retinal ON-bipolar cells. MAR sera label TRPM1-transfected HEK cells, produce expected 180 kDa band on Western blot, colocalize with GFP in Grm6-GFP ON-bipolar cells, and do not stain Trpm1-/- retina. The targeted epitope is intracellular, and sera can be internalized by retinal cells.","method":"Immunofluorescence on TRPM1-transfected cells and retinal sections, Western blot, Trpm1-/- negative control, co-localization with Gαo and Grm6-GFP","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods with rigorous KO control, replicated by multiple labs","pmids":["21411639"],"is_preprint":false},{"year":2013,"finding":"Intravitreal injection of MAR IgG (TRPM1-positive) into wild-type mouse eyes attenuated the ERG b-wave and IgG appeared in retinal ON-bipolar cells at experiment's end; this effect was absent in Trpm1-/- mice. Live incubation of retinal neurons with TRPM1-positive MAR serum resulted in selective IgG accumulation in ON-bipolar cells, dependent on TRPM1 expression, indicating autoantibody uptake via TRPM1 reduces ON-bipolar cell function.","method":"Intravitreal IgG injection with ERG recording, immunofluorescence in wild-type vs. Trpm1-/- retina, live-neuron incubation assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo functional experiment with KO control, two orthogonal approaches","pmids":["23936334"],"is_preprint":false},{"year":2011,"finding":"PKCα activation by DAG (via OAG analog) potentiates TRPM1 current in rod bipolar cells but not ON-cone bipolar cells. TRPM1 current is susceptible to voltage-independent inhibition by intracellular Mg2+, and PKCα activation relieves this Mg2+ inhibition, increasing transmission gain at the rod-rod bipolar cell synapse.","method":"Whole-cell patch-clamp of rod and cone bipolar cells with pharmacological DAG analog application; PKCα knockout mice; PKCα inhibitor; manipulation of intracellular Mg2+","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — pharmacology plus genetic KO (PKCα-/-) with multiple ionic manipulations, two orthogonal approaches","pmids":["21940450"],"is_preprint":false},{"year":2016,"finding":"Both Gαo (constitutively active form) and Gβγ bind and cooperate to close TRPM1 channels in rod bipolar cells. Phosducin or inactive Gαo (both sequester Gβγ) opened the channel. Bioluminescent energy transfer (BRET) assays revealed Gαo interacts with both N- and C-termini of TRPM1, while Gβγ interacts only with the N-terminus. Co-immunoprecipitation confirmed TRPM1 interaction with Gβ3 and active/inactive forms of Gαo.","method":"Intracellular dialysis in rod bipolar cells, BRET assay, Co-immunoprecipitation","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — BRET plus Co-IP plus electrophysiology, single lab with three orthogonal methods","pmids":["26883481"],"is_preprint":false},{"year":2014,"finding":"Purified recombinant TRPM1 exists predominantly as a dimer (not tetramer) as shown by blue native gels, size exclusion chromatography, cross-linking, and cryo-EM single-particle analysis with approximate 2-fold symmetry. In mouse retina, TRPM1 is present in two distinct complexes: one matching the recombinant dimer size and one much larger, suggesting additional partner subunits participate in the native transduction channel.","method":"Insect cell recombinant expression, affinity purification, blue native gels, size exclusion chromatography, chemical cross-linking, cryoelectron microscopy with single-particle analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal structural/biophysical methods in a single study with native retina validation","pmids":["25112866"],"is_preprint":false},{"year":2015,"finding":"LRIT3 is essential for the localization of TRPM1 to the dendritic tips of depolarizing bipolar cells; in Lrit3nob6/nob6 mice, TRPM1 staining at the dendritic tips was severely decreased across all ON-bipolar cell types.","method":"Immunofluorescence confocal microscopy of Lrit3 knockout mouse retina sections with TRPM1 antibody","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with direct protein localization assay, single lab","pmids":["25997951"],"is_preprint":false},{"year":2019,"finding":"LRIT3 is expressed presynaptically in rod photoreceptors and acts as a transsynaptic organizer; restoration of LRIT3 expression in Lrit3-/- rods (by rAAV) restores postsynaptic glutamate signalplex including TRPM1 and rescues rod-driven vision.","method":"rAAV-mediated rod-specific LRIT3 expression in Lrit3-/- retina, immunofluorescence of TRPM1 and other signalplex components, ERG","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue experiment with functional ERG readout and protein localization, demonstrates transsynaptic mechanism","pmids":["31189098"],"is_preprint":false},{"year":2012,"finding":"A point mutation in the pore domain of TRPM1 (A1068T, exon 23) causes depolarizing bipolar cell dysfunction. This mutant TRPM1 protein is retained at dendritic tips but acts as a dominant negative, reducing channel function in heterozygous animals by ~32%.","method":"Chemical mutagenesis screen (ENU), complementation testing with Trpm1-/- mice, sequencing, whole-cell patch-clamp, ERG","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — mutagenesis with complementation testing and electrophysiological validation","pmids":["22896717"],"is_preprint":false},{"year":2013,"finding":"In human melanocytes, mGluR6 signaling positively (not negatively) enhances TRPM1 Ca2+ channel activity and increases melanin content; shRNA knockdown of TRPM1 or mGluR6 abolished L-AP4-induced Ca2+ influx and TRPM1 currents. Forced expression of Gαo in melanocytes restored negative coupling of TRPM1 to mGluR6, explaining the tissue-specific difference from retina.","method":"shRNA knockdown of TRPM1 and mGluR6, Ca2+ imaging, patch-clamp, Gαo forced expression, pertussis toxin treatment","journal":"Pigment cell & melanoma research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function combined with gain-of-function (Gαo), single lab","pmids":["23452348"],"is_preprint":false},{"year":2011,"finding":"Ultrastructural immunoelectron microscopy in human retina localizes TRPM1 immunoreactivity specifically to the tips of ON-bipolar cell dendrites that invaginate cone pedicles and rod spherules. TRPM1 immunoreactivity was also occasionally found on rod spherule ribbons, suggesting a possible dual function.","method":"Immunohistochemistry at light and electron microscope level, in situ hybridization, laser dissection microscopy PCR","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ultrastructural localization with multiple complementary methods, single lab","pmids":["21896854"],"is_preprint":false},{"year":2015,"finding":"Voriconazole, an antifungal agent causing visual side effects, inhibits TRPM1 channels in retinal ON-bipolar cells; it almost completely blocked capsaicin-activated TRPM1 currents and inhibited ON-bipolar cell responses evoked by mGluR6 antagonist CPPG. In contrast, voriconazole only slightly inhibited mGluR6-mediated GIRK currents, identifying TRPM1 (not mGluR6) as the primary retinal target.","method":"Mouse ERG before/after intraperitoneal voriconazole; patch-clamp of ON-bipolar cells; patch-clamp of CHO/HEK cells expressing TRPM3 or mGluR6+GIRK","journal":"Investigative ophthalmology & visual science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo ERG plus ex vivo patch-clamp plus heterologous expression, multiple cell systems","pmids":["25650413"],"is_preprint":false},{"year":2011,"finding":"TRPM1 current in ON-bipolar cells undergoes use-dependent desensitization; desensitization onset is linear above a ~20% activation threshold, reducing responses to ~40% of peak with a time constant of ~1 s, with slow recovery (>20 s). This desensitization shapes the kinetics of downstream ganglion cell EPSCs by curtailing their sustained component.","method":"Whole-cell patch-clamp of ON-bipolar cells and ganglion cells in mouse retinal slices","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — detailed patch-clamp characterization with upstream and downstream cell recordings, single lab","pmids":["22041187"],"is_preprint":false},{"year":2017,"finding":"TRPM1 channel opening is required for the development of the rod ON bipolar cell–AII amacrine cell pathway; deletion of TRPM1 causes abnormal contraction of rod bipolar terminals and decreased synaptic connections with amacrine cells, as well as reduced AII amacrine cell dendritic complexity. Activated Gαo interacts with TRPM1 and induces contraction of rod bipolar terminals. Overexpression of Channelrhodopsin-2 partially rescued rod bipolar development in TRPM1-/- retina.","method":"TRPM1 knockout, mGluR6 knockout, VGluT1 knockout mouse morphological comparisons; Channelrhodopsin-2 overexpression rescue; constitutively closed TRPM1 form; Co-IP of Gαo with TRPM1","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis across multiple KO lines, rescue experiment, biochemical interaction, well-controlled","pmids":["28899920"],"is_preprint":false},{"year":2018,"finding":"The majority of TRPM1 in ON-bipolar cells resides in the endoplasmic reticulum (ER), not at the plasma membrane; TRPM1 colocalizes with ER markers in both heterologous cells and native mouse bipolar cell bodies, but is excluded from the Golgi. Fluorescence protease protection assays showed that both N and C termini of TRPM1 are cytoplasmic.","method":"Confocal co-localization with ER/Golgi markers, fluorescence protease protection (FPP) assay with TRPM1-GFP fusions in heterologous cells, immunostaining of mouse retina","journal":"eNeuro","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal localization methods, single lab","pmids":["30027108"],"is_preprint":false},{"year":2015,"finding":"The N-terminal region of TRPM1 (residues A451-N566) contains a PIP2-binding site; the residue K464 is involved in PIP2 interactions, characterized by biophysical methods and molecular modeling.","method":"Biophysical methods (fluorescence spectroscopy) and molecular modeling on recombinant N-terminal TRPM1 fragment","journal":"Biophysical chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — in vitro binding with peptide fragment only, no functional channel validation, single lab","pmids":["26544986"],"is_preprint":false},{"year":2016,"finding":"The N-terminal region L242-E344 of TRPM1 is an S100A1 binding domain; complex formation is calcium-dependent and is mediated by positively charged (K271, R273, R274) and hydrophobic (L263, V270, L276) residues at the N-terminus.","method":"Fluorescence spectroscopy, bioinformatics, mutagenesis of N-terminal TRPM1 fragment","journal":"The international journal of biochemistry & cell biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — in vitro binding with recombinant fragment, no functional validation in intact channel, single lab","pmids":["27435061"],"is_preprint":false},{"year":2021,"finding":"TRPM1 is a bona fide HSP90 client protein; AUY922 (HSP90 inhibitor) reduces TRPM1 expression by disrupting the CDC37-HSP90 chaperone complex as demonstrated by co-immunoprecipitation. Loss of TRPM1 mediates AUY922-induced cell apoptosis, ROS production and growth inhibition.","method":"Co-immunoprecipitation of TRPM1 with HSP90/CDC37, loss-of-function and gain-of-function in cells, iTRAQ proteomics, TUNEL, ROS assay","journal":"Journal of biomedical science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating chaperone interaction plus functional loss/gain-of-function, single lab","pmids":["34301262"],"is_preprint":false},{"year":2022,"finding":"TRPM1 promotes acral melanoma tumor progression by elevating cytosolic Ca2+ levels, activating CaMKIIδ, promoting CaMKIIδ/AKT interaction and AKT activation. CaMKII inhibitor KN93 suppressed TRPM1-dependent colony formation, cell migration, invasion and xenograft tumor growth.","method":"Loss-of-function and gain-of-function in melanoma cells, Western blotting, colony formation, migration/invasion assays, xenograft mouse models, Ca2+ measurement","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays with pharmacological inhibition and in vivo validation, single lab","pmids":["36585114"],"is_preprint":false},{"year":2021,"finding":"TRPM1 has a functional role in the iris sphincter muscle; Trpm1-/- mice show severely reduced pupillary light reflex at both scotopic and photopic intensities, attributable to loss of TRPM1 in both the retina and iris sphincter muscle. Light-driven iris constriction independent of brain signaling also requires Trpm1. Capsaicin-driven (sensory) iris constriction also requires Trpm1 expression, implicating TRPM1 in pain-afferent-driven iris responses.","method":"Trpm1 knockout mice, in vivo PLR measurements, isolated eye light response assays, capsaicin pharmacology","journal":"Experimental eye research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO phenotype across multiple light conditions and isolated eye preparation, single lab","pmids":["34954202"],"is_preprint":false},{"year":2016,"finding":"Capsaicin activates TRPM1 channels in the lateral amygdala to modify LTD, via a mechanism independent of TRPV1 and involving group I mGluRs and TRPC5. This effect was absent in TRPM1-/- mice, demonstrating TRPM1 expression and function in the brain.","method":"Electrophysiology (LTD measurement) in TRPM1-/- mice, pharmacological profiling with TRPV1 antagonists and group I mGluR blockers","journal":"Neurobiology of learning and memory","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with pharmacological dissection, single lab, novel brain localization","pmids":["27633915"],"is_preprint":false},{"year":2018,"finding":"Differential epitope masking by monoclonal antibodies reveals that a specific N-terminal epitope (N2d) near the transmembrane domain of TRPM1 is masked at the dendritic tips but accessible in cell bodies, suggesting formation of a synapse-specific multiprotein complex at the dendritic tip pool of TRPM1.","method":"Monoclonal antibody epitope mapping, differential immunostaining of retinal soma vs. dendritic tips, quantitative immunoblotting of synaptosome fractions","journal":"Visual neuroscience","confidence":"Low","confidence_rationale":"Tier 3 / Weak — antibody masking is indirect evidence for a complex; no binding partners identified in this study","pmids":["29370879"],"is_preprint":false},{"year":2013,"finding":"Anti-TRPM1 serum from a paraneoplastic retinopathy patient, injected intravitreally into wild-type mice, caused acute death of retinal ON-bipolar cells within 5 hours (TUNEL-positive) and chronic inner nuclear layer thinning at 3 months; no bipolar cell death was observed in TRPM1 knockout mice, confirming TRPM1-dependent antibody-mediated ON-bipolar cell degeneration.","method":"Intravitreal serum injection in wild-type and TRPM1 KO mice, ERG, TUNEL staining, immunohistochemistry, INL thickness measurement","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo injection with TRPM1 KO control demonstrating TRPM1-dependent mechanism","pmids":["24282602"],"is_preprint":false},{"year":2026,"finding":"Cryo-EM structure of TRPM1 reveals a canonical tetrameric fold in the intracellular domain but a non-canonical, inverted transmembrane domain arrangement: the voltage sensor-like domain (VSLD) and pore domain (PD) are domain-swapped with opposite handedness compared to other related channels, forming a large pore-like structure consistent with ion channel function.","method":"Cryogenic electron microscopy (cryo-EM) structural determination of purified TRPM1","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure, single lab but high-resolution structural determination","pmids":["41857038"],"is_preprint":false},{"year":2026,"finding":"Cryo-EM structure of human TRPM1 in conducting state reveals tetrameric assembly with an inverted (clockwise) domain-swapped pore module, dilated selectivity filter, expanded central cavity, and splayed S6 forming a wide intracellular gate. Single-channel recordings confirm constitutive activity consistent with the conductive state captured.","method":"Cryo-EM structural determination, single-channel electrophysiology","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — cryo-EM structure with functional validation, preprint not yet peer-reviewed","pmids":["41757028"],"is_preprint":true},{"year":2025,"finding":"The IG domain of LRIT3 is required for localization of TRPM1 to the DBC signalplex; restoring LRIT3 lacking the IG domain fails to restore TRPM1 expression at synapses even when Nyctalopin is correctly localized. A model is proposed where the LRIT3 LRR domain trans-synaptically binds Nyctalopin while the IG domain interacts with TRPM1.","method":"rAAV-expressed LRIT3 deletion constructs in Lrit3-/- retina, immunofluorescence of TRPM1 and signalplex components, ERG","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific rescue in genetic KO with functional readout, preprint, single lab","pmids":["41757028"],"is_preprint":true}],"current_model":"TRPM1 is a constitutively active, nonselective cation channel with an inverted transmembrane domain topology localized primarily to the postsynaptic dendritic tips of retinal ON-bipolar cells, where it serves as the effector channel of the mGluR6–Go signal transduction cascade: in darkness, glutamate activates mGluR6, which couples to Go, releasing Gβγ (and activated Gαo) to close TRPM1, while light reduces glutamate release and allows TRPM1 to open, producing the depolarizing b-wave response; TRPM1 targeting to the dendritic tip signalplex requires transsynaptic scaffolding by LRIT3 (via its IG domain interacting with TRPM1) and nyctalopin, and is mGluR6-dependent; additional regulation includes Mg2+-dependent inhibition relieved by PKCα, PIP2 and S100A1 interactions at the N-terminus, and HSP90 chaperone-dependent folding, while in melanocytes TRPM1 mediates Ca2+ influx coupled positively to mGluR6 to support melanogenesis."},"narrative":{"mechanistic_narrative":"TRPM1 is a constitutively active, nonselective cation channel that serves as the effector channel of the depolarizing light response in retinal ON-bipolar cells, where its genetic deletion abolishes the ERG b-wave and the photoresponse [PMID:19861548, PMID:19966281]. Localized to the dendritic tips of ON-bipolar cells co-localizing with mGluR6, TRPM1 is gated by the mGluR6–Go cascade: it is closed when Go is activated, with both Gβγ dimer and the constitutively active form of Gαo binding and cooperating to close the channel—Gβγ interacting with the N-terminus and Gαo with both N- and C-termini—while sequestration of Gβγ opens it [PMID:19966281, PMID:22586107, PMID:26883481]. Channel activity is further tuned by relief of voltage-independent intracellular Mg2+ inhibition through PKCα activation, which raises synaptic transmission gain, and by use-dependent desensitization that shapes downstream ganglion cell responses [PMID:21940450, PMID:22041187]. Targeting of TRPM1 to the postsynaptic dendritic-tip signalplex requires a transsynaptic scaffold: TRPM1 forms an in vivo complex with nyctalopin, its localization is mGluR6-dependent, and presynaptic LRIT3—via its IG domain—organizes signalplex assembly and TRPM1 retention at the synapse [PMID:21832182, PMID:22131384, PMID:25997951, PMID:31189098]. Beyond gating, channel opening drives the developmental wiring of the rod ON-bipolar–AII amacrine pathway, and TRPM1 also functions in the iris sphincter muscle to mediate the pupillary light reflex [PMID:28899920, PMID:34954202]. Structurally, TRPM1 is a tetrameric channel with a non-canonical, inverted domain-swapped transmembrane arrangement and a wide conductive pore [PMID:41857038]. In melanocytes TRPM1 conducts Ca2+, supports Ca2+ homeostasis and melanogenesis under MITF transcriptional control, and is positively coupled to mGluR6—a tissue-specific reversal of its retinal polarity explained by the relative absence of Gαo [PMID:19436059, PMID:19587221, PMID:15577322, PMID:23452348]. Clinically, TRPM1 is the autoantigen in melanoma-associated retinopathy, where patient autoantibodies are taken up by ON-bipolar cells in a TRPM1-dependent manner, attenuate the b-wave, and drive ON-bipolar cell degeneration [PMID:21411639, PMID:23936334, PMID:24282602].","teleology":[{"year":2009,"claim":"Established TRPM1 as the long-sought effector channel of the retinal ON-bipolar cell light response, answering what carries the depolarizing current downstream of mGluR6.","evidence":"TRPM1 knockout mouse ERG and patch-clamp of ON-bipolar cells, immunolocalization with mGluR6, and heterologous reconstitution with Go manipulation","pmids":["19861548","19966281"],"confidence":"High","gaps":["Did not define which Go subunit (Gα vs Gβγ) closes the channel","Mechanism of constitutive activity not resolved"]},{"year":2009,"claim":"Showed TRPM1 conducts an endogenous cation current in melanocytes and supports Ca2+-dependent melanogenesis, extending its function beyond retina to pigment biology.","evidence":"Endogenous current recording, microRNA and shRNA knockdown, Ca2+ and tyrosinase/melanin assays, p53 repression in primary human melanocytes and melanoma cells","pmids":["19436059","19587221"],"confidence":"Medium","gaps":["Predominantly intracellular vesicular localization in melanoma cells leaves plasma-membrane gating unclear","Single-lab functional readouts"]},{"year":2004,"claim":"Identified MITF-driven, E-box/M-box-dependent melanocyte-specific transcription of TRPM1 and multiple splice/cleavage isoforms, defining how the gene is regulated in pigment cells.","evidence":"Promoter deletion analysis, MITF activation assay, Western blot in melanocytes/melanoma cells","pmids":["15577322"],"confidence":"Medium","gaps":["Functional roles of distinct isoforms not assigned","Retinal transcriptional control not addressed"]},{"year":2011,"claim":"Demonstrated that TRPM1 is a plasma-membrane channel that can heteromultimerize with TRPM3 and is inhibited by extracellular zinc through a defined pore stretch, characterizing intrinsic channel properties.","evidence":"Heterologous expression patch-clamp, pore mutagenesis, heteromultimer co-expression, zinc inhibition assays","pmids":["21278253"],"confidence":"High","gaps":["Physiological relevance of TRPM1/TRPM3 heteromers in retina not established","Did not address native gating by G-proteins"]},{"year":2011,"claim":"Defined the transsynaptic scaffolding required to deliver TRPM1 to the dendritic-tip signalplex, answering how the channel is positioned at the synapse.","evidence":"Proteomic pulldown of TRPM1–nyctalopin complex from retina and immunolocalization in mGluR6-knockout retina; capsaicin testing in mGluR6-null bipolar cells","pmids":["21832182","22131384"],"confidence":"High","gaps":["Did not identify the factor conferring constitutive activity","Direct binding interfaces not mapped"]},{"year":2012,"claim":"Resolved the G-protein gating mechanism, showing Gβγ (and later cooperatively Gαo) closes TRPM1 and defining the N-/C-terminal interaction sites.","evidence":"Intracellular dialysis of Gβγ/Gαo across multiple cell types, GPCR pharmacology, BRET and Co-IP","pmids":["22586107","26883481"],"confidence":"High","gaps":["Structural basis of G-protein-induced closure not visualized","Stoichiometry of G-protein:channel binding unresolved"]},{"year":2011,"claim":"Showed PKCα and use-dependent desensitization tune TRPM1 gain and kinetics, explaining synaptic signal shaping at the rod-bipolar synapse.","evidence":"Patch-clamp with DAG analog, PKCα knockout, Mg2+ manipulation, and ganglion cell EPSC recordings","pmids":["21940450","22041187"],"confidence":"High","gaps":["PKCα phosphorylation site on TRPM1 not identified","Molecular basis of desensitization unknown"]},{"year":2011,"claim":"Identified TRPM1 as the autoantigen in melanoma-associated retinopathy, linking the channel to a paraneoplastic disease.","evidence":"MAR serum immunofluorescence on TRPM1-transfected and Grm6-GFP cells, Western blot, Trpm1-/- negative control","pmids":["21411639"],"confidence":"High","gaps":["Precise intracellular epitope not finely mapped here","Pathogenic mechanism not yet demonstrated in vivo"]},{"year":2012,"claim":"Provided a disease-relevant pore mutation (A1068T) acting as a dominant negative, validating the pore domain's role in channel function and bipolar cell dysfunction.","evidence":"ENU mutagenesis, complementation testing with Trpm1-/-, sequencing, patch-clamp and ERG","pmids":["22896717"],"confidence":"High","gaps":["Structural consequence of A1068T not determined","Human genotype correlation not addressed here"]},{"year":2013,"claim":"Demonstrated that MAR autoantibodies are internalized via TRPM1 and cause TRPM1-dependent ON-bipolar cell dysfunction and degeneration, establishing disease causation.","evidence":"Intravitreal IgG/serum injection in wild-type vs Trpm1-/- mice, ERG, TUNEL, INL thickness, live-neuron uptake assays","pmids":["23936334","24282602"],"confidence":"High","gaps":["Mechanism by which internalized antibody impairs/destroys cells unresolved","Whether antibody blocks channel directly not determined"]},{"year":2013,"claim":"Explained the tissue-specific reversal of TRPM1–mGluR6 coupling, showing positive coupling in melanocytes that converts to negative coupling upon Gαo expression.","evidence":"shRNA knockdown of TRPM1/mGluR6, Ca2+ imaging, patch-clamp, forced Gαo expression, pertussis toxin in melanocytes","pmids":["23452348"],"confidence":"Medium","gaps":["Single-lab finding","Endogenous melanocyte G-protein milieu not fully characterized"]},{"year":2014,"claim":"Provided the first biophysical/structural insight into TRPM1 assembly, showing a recombinant dimer plus a larger native complex, indicating additional native subunits.","evidence":"Recombinant purification, blue native gels, SEC, cross-linking, cryo-EM single-particle analysis, native retina complexes","pmids":["25112866"],"confidence":"High","gaps":["Identity of additional native subunits not determined","Dimer vs tetramer discrepancy with later structures unresolved at the time"]},{"year":2015,"claim":"Established LRIT3 as essential for dendritic-tip localization of TRPM1, deepening the model of signalplex assembly.","evidence":"Immunofluorescence of Lrit3 knockout retina with TRPM1 antibody","pmids":["25997951"],"confidence":"Medium","gaps":["Direct LRIT3–TRPM1 binding not shown in this study","Mechanism of localization downstream of LRIT3 unclear"]},{"year":2019,"claim":"Defined LRIT3 as a presynaptic transsynaptic organizer whose rod-specific restoration rescues the postsynaptic signalplex and vision, clarifying directional assembly.","evidence":"rAAV rod-specific LRIT3 expression in Lrit3-/-, signalplex immunofluorescence, ERG","pmids":["31189098"],"confidence":"High","gaps":["Molecular interactions bridging presynaptic LRIT3 to postsynaptic TRPM1 not detailed here"]},{"year":2017,"claim":"Revealed a developmental role for TRPM1 channel opening in wiring the rod bipolar–AII amacrine pathway, beyond acute signal transduction.","evidence":"Comparative morphology across Trpm1, mGluR6, VGluT1 knockouts, Channelrhodopsin-2 rescue, constitutively closed TRPM1, Co-IP of Gαo","pmids":["28899920"],"confidence":"High","gaps":["Downstream signaling linking channel activity to synaptic morphogenesis unknown"]},{"year":2018,"claim":"Showed most TRPM1 resides in the ER rather than the plasma membrane and that both termini are cytoplasmic, refining channel topology and trafficking.","evidence":"Confocal co-localization with ER/Golgi markers, fluorescence protease protection assay, retina immunostaining","pmids":["30027108"],"confidence":"Medium","gaps":["Functional role of the ER-resident pool not defined","Trafficking signals controlling surface delivery unknown"]},{"year":2016,"claim":"Identified candidate N-terminal regulatory ligand-binding sites for PIP2 and Ca2+-dependent S100A1, suggesting additional modulatory inputs to the channel.","evidence":"Fluorescence spectroscopy, mutagenesis and molecular modeling on recombinant N-terminal TRPM1 fragments","pmids":["26544986","27435061"],"confidence":"Low","gaps":["In vitro fragment binding only, no functional channel validation","Physiological relevance in intact channel unestablished"]},{"year":2021,"claim":"Defined TRPM1 as an HSP90/CDC37 client whose chaperone-dependent stability links it to apoptosis and ROS regulation in cells.","evidence":"Co-IP of TRPM1 with HSP90/CDC37, HSP90 inhibitor, loss/gain-of-function, iTRAQ, TUNEL, ROS assays","pmids":["34301262"],"confidence":"Medium","gaps":["Single-lab finding","Relevance to retinal TRPM1 folding not tested"]},{"year":2021,"claim":"Extended TRPM1 function to the iris sphincter muscle and pupillary light reflex, demonstrating roles outside ON-bipolar cells.","evidence":"Trpm1 knockout PLR measurements, isolated eye light response, capsaicin pharmacology","pmids":["34954202"],"confidence":"Medium","gaps":["Molecular pathway in iris muscle not defined","Single-lab phenotype"]},{"year":2016,"claim":"Demonstrated TRPM1 expression and function in the lateral amygdala modulating LTD, identifying a brain role distinct from TRPV1.","evidence":"LTD electrophysiology in Trpm1-/- mice with TRPV1 and group I mGluR pharmacology","pmids":["27633915"],"confidence":"Medium","gaps":["Mechanism linking TRPM1 to TRPC5 and group I mGluRs unresolved","Single-lab finding"]},{"year":2022,"claim":"Linked melanocyte TRPM1 Ca2+ signaling to acral melanoma progression through a CaMKIIδ–AKT axis, defining an oncogenic mechanism.","evidence":"Loss/gain-of-function in melanoma cells, Western blot, migration/invasion/colony assays, CaMKII inhibitor, xenografts","pmids":["36585114"],"confidence":"Medium","gaps":["Direct CaMKIIδ activation by TRPM1-mediated Ca2+ not biochemically isolated","Single-lab study"]},{"year":2026,"claim":"Resolved the TRPM1 structure as a tetramer with a non-canonical inverted, domain-swapped transmembrane fold and a wide conductive pore, explaining its constitutive activity.","evidence":"Cryo-EM structural determination of purified TRPM1 and human TRPM1 in conducting state with single-channel recordings","pmids":["41857038","41757028"],"confidence":"High","gaps":["Structural basis of G-protein-induced closure not captured","Conformational changes during gating not visualized"]},{"year":null,"claim":"How the mGluR6–Go–Gβγ/Gαo gating signal is structurally transmitted to open and close the inverted TRPM1 pore, and the full composition of the native dendritic-tip signalplex, remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No closed-state structure with bound G-proteins","Additional native subunits beyond nyctalopin/LRIT3 not identified","Mechanism converting channel activity to developmental wiring unknown"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,7,18]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[22]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,1,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,12,17]},{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[0,27]}],"complexes":["TRPM1–nyctalopin–mGluR6 dendritic-tip signalplex","HSP90–CDC37 chaperone complex"],"partners":["GRM6","NYX","LRIT3","GNAO1","PRKCA","TRPM3","HSP90","CDC37"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q7Z4N2","full_name":"Transient receptor potential cation channel subfamily M member 1","aliases":["Long transient 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Impermeable to zinc ions (PubMed:21278253). In addition, forms heteromultimeric ion channels with TRPM3 which are permeable for calcium and zinc ions (PubMed:21278253). Plays an essential role for the depolarizing photoresponse of retinal ON bipolar cells (PubMed:19878917, PubMed:19896109). In the dark, tonic release of glutamate activates the G-protein coupled receptor for glutamate, GRM6, its activation induces the release of G(o) protein and the beta-gamma G protein dimer. Both subunits can interact and inactivate the TRPM1 channel. A light onset, induces decrease in glutamate release and deactivation of GRM6 leading to channel opening and membrane depolarization (By similarity). May play a role in metastasis suppression (PubMed:9537257)","subcellular_location":"Cell membrane; Endoplasmic reticulum membrane; Cell projection, axon","url":"https://www.uniprot.org/uniprotkb/Q7Z4N2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRPM1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TRPM1","total_profiled":1310},"omim":[{"mim_id":"615004","title":"LEUCINE-RICH REPEAT, IMMUNOGLOBULIN-LIKE, AND TRANSMEMBRANE DOMAINS-CONTAINING PROTEIN 3; LRIT3","url":"https://www.omim.org/entry/615004"},{"mim_id":"614565","title":"NIGHT BLINDNESS, CONGENITAL STATIONARY, TYPE 1E; CSNB1E","url":"https://www.omim.org/entry/614565"},{"mim_id":"613753","title":"MICRO RNA 211; MIR211","url":"https://www.omim.org/entry/613753"},{"mim_id":"613216","title":"NIGHT BLINDNESS, CONGENITAL STATIONARY, TYPE 1C; CSNB1C","url":"https://www.omim.org/entry/613216"},{"mim_id":"608961","title":"TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL, SUBFAMILY M, MEMBER 3; TRPM3","url":"https://www.omim.org/entry/608961"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Centriolar satellite","reliability":"Uncertain"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"retina","ntpm":16.2},{"tissue":"skin 1","ntpm":4.6}],"url":"https://www.proteinatlas.org/search/TRPM1"},"hgnc":{"alias_symbol":["LTRPC1","CSNB1C"],"prev_symbol":["MLSN1"]},"alphafold":{"accession":"Q7Z4N2","domains":[{"cath_id":"-","chopping":"52-248","consensus_level":"medium","plddt":85.9984,"start":52,"end":248},{"cath_id":"-","chopping":"954-1027_1046-1126_1139-1146","consensus_level":"medium","plddt":80.9556,"start":954,"end":1146},{"cath_id":"1.25.40","chopping":"372-396_452-486","consensus_level":"medium","plddt":81.7013,"start":372,"end":486}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z4N2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z4N2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z4N2-F1-predicted_aligned_error_v6.png","plddt_mean":66.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRPM1","jax_strain_url":"https://www.jax.org/strain/search?query=TRPM1"},"sequence":{"accession":"Q7Z4N2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q7Z4N2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q7Z4N2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z4N2"}},"corpus_meta":[{"pmid":"19861548","id":"PMC_19861548","title":"TRPM1 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Advances in ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/36173494","citation_count":5,"is_preprint":false},{"pmid":"34562437","id":"PMC_34562437","title":"Broad locations of antigenic regions for anti-TRPM1 autoantibodies in paraneoplastic retinopathy with retinal ON bipolar cell dysfunction.","date":"2021","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/34562437","citation_count":5,"is_preprint":false},{"pmid":"39109318","id":"PMC_39109318","title":"Anti-TRPM1 autoantibody-positive unilateral melanoma associated retinopathy (MAR) triggered by immunotherapy recapitulates functional and structural details of TRPM1-associated congenital stationary night blindness.","date":"2024","source":"American journal of ophthalmology case reports","url":"https://pubmed.ncbi.nlm.nih.gov/39109318","citation_count":4,"is_preprint":false},{"pmid":"35433692","id":"PMC_35433692","title":"Glucocorticoid Exposure of Preimplantation Embryos Increases Offspring Anxiety-Like Behavior by Upregulating miR-211-5p via Trpm1 Demethylation.","date":"2022","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/35433692","citation_count":4,"is_preprint":false},{"pmid":"31645983","id":"PMC_31645983","title":"A founder deletion in the TRPM1 gene associated with congenital stationary night blindness and myopia is highly prevalent in Ashkenazi Jews.","date":"2019","source":"Human genome variation","url":"https://pubmed.ncbi.nlm.nih.gov/31645983","citation_count":4,"is_preprint":false},{"pmid":"34954202","id":"PMC_34954202","title":"Trpm1: Novel function at the intersection of light and pain response in the iris.","date":"2021","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/34954202","citation_count":3,"is_preprint":false},{"pmid":"33691579","id":"PMC_33691579","title":"Congenital stationary night blindness in a patient with mild learning disability due to a compound heterozygous microdeletion of 15q13 and a missense mutation in TRPM1.","date":"2021","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33691579","citation_count":2,"is_preprint":false},{"pmid":"21439949","id":"PMC_21439949","title":"Genetic variants in transient receptor potential cation channel, subfamily M 1 (TRPM1) and their risk of albuminuria-related traits in Mexican Americans.","date":"2011","source":"Clinica chimica acta; 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genetic deletion of TRPM1 abolishes chemically simulated light responses from rod bipolar cells, and TRPM1 protein localizes to the dendrites of ON-bipolar cells in mouse and macaque retina.\",\n      \"method\": \"TRPM1 knockout mouse (ERG showing loss of b-wave), whole-cell patch-clamp recording from ON-bipolar cells in retinal slices, immunofluorescent confocal microscopy, in situ hybridization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (KO ERG, patch-clamp, immunolocalization), replicated across multiple labs in the same year\",\n      \"pmids\": [\"19861548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The long form of TRPM1 (TRPM1-L) functions as a constitutively active nonselective cation channel in ON-bipolar cells, localizes specifically to the dendritic tips of ON-bipolar cells co-localizing with mGluR6, and its activity is negatively regulated by Go in the mGluR6 cascade. TRPM1 null mice completely lose the photoresponse of ON-bipolar cells.\",\n      \"method\": \"TRPM1 null mouse ERG and patch-clamp recordings, immunolocalization with mGluR6 co-staining, heterologous expression in TRPM1-L-expressing cells with Go manipulation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — KO mouse physiology plus heterologous reconstitution, replicated across labs\",\n      \"pmids\": [\"19966281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TRPM1 forms an endogenous ion channel current in primary human neonatal epidermal melanocytes and mouse melanoma cells; knockdown by microRNA directed against TRPM1 abolished this current. In melanoma cells, TRPM1 is prevalent in highly dynamic intracellular vesicular structures rather than at the plasma membrane.\",\n      \"method\": \"Endogenous current recording in primary melanocytes, microRNA-mediated knockdown, subcellular localization by live imaging\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus knockdown plus localization, single lab\",\n      \"pmids\": [\"19436059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TRPM1 knockdown by lentiviral shRNA in human melanocytes reduces intracellular Ca2+ levels, decreases Ca2+ uptake, reduces tyrosinase activity and intracellular melanin, establishing a role for TRPM1 in Ca2+ homeostasis and melanogenesis. p53 overexpression or UVB-induced p53 represses TRPM1 expression with concomitant decrease in Ca2+ mobilization.\",\n      \"method\": \"Lentiviral shRNA knockdown, intracellular Ca2+ measurements, tyrosinase activity assay, melanin quantification, p53 transfection and UVB treatment\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with multiple functional readouts, single lab\",\n      \"pmids\": [\"19587221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TRPM1 (MLSN1) promoter contains four E-boxes including an M-box; a 654 bp upstream sequence containing two distal E-boxes (E3 and E4) is sufficient for melanocyte-specific transcription and is activated by the transcription factor MITF. Multiple TRPM1 polypeptide isoforms are generated by alternative splicing and proteolytic cleavage in melanocytes and melanoma cells.\",\n      \"method\": \"Promoter deletion analysis, MITF activation assay, Western blot with anti-MLSN1 antibody\",\n      \"journal\": \"Melanoma research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — deletion analysis plus Western blot, single lab, two orthogonal methods\",\n      \"pmids\": [\"15577322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRPM1 forms a complex with nyctalopin in vivo in the mouse retina (identified by proteomic pulldown from retinal lysates); nyctalopin also interacts with mGluR6. Disruption of mGluR6 prevents targeting of TRPM1 to the postsynaptic compartment of ON-bipolar neurons, indicating mGluR6-dependent localization of TRPM1.\",\n      \"method\": \"Proteomic search (Co-IP/pulldown from mouse retina), immunolocalization in mGluR6 knockout retina\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal pulldown plus genetic epistasis (mGluR6 KO localization), replicated and consistent with multiple other studies\",\n      \"pmids\": [\"21832182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Gβγ dimer, but not Gαo, closes TRPM1 channels in rod bipolar cells, human epidermal melanocytes endogenously expressing TRPM1, and HEK293 cells transfected with TRPM1. Dialysis of Gβγ into cells closed TRPM1 channels; activation of an endogenous GPCR pathway releasing Gβγ without activating Go also closed TRPM1.\",\n      \"method\": \"Whole-cell patch-clamp with intracellular dialysis of Gβγ or Gαo in multiple cell types; pharmacological GPCR activation in HEK293 cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct intracellular dialysis combined with multiple cell types, orthogonal pharmacological test\",\n      \"pmids\": [\"22586107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRPM1 is an ion-conducting plasma membrane channel. Heterologous TRPM1 expression induces ionic conductances; TRPM1 and TRPM3 form functional heteromultimeric channels. Channels containing the pore of TRPM1 are inhibited by extracellular zinc ions at physiological concentrations, mediated by a seven-amino-acid stretch specific to the pore region of TRPM1.\",\n      \"method\": \"Heterologous expression and patch-clamp electrophysiology, mutagenesis of pore region, heteromultimer co-expression, zinc inhibition assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis identifying the zinc-inhibition determinant\",\n      \"pmids\": [\"21278253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In mGluR6-null rod bipolar cells, the TRPM1 channel is inactive despite partial plasma membrane localization; TRPM1 immunostaining at the dendritic tips is greatly reduced in mGluR6-null retina but remains in soma and primary dendrites. Capsaicin failed to activate TRPM1 in null cells, suggesting the channel requires a complex or unknown factor to be constitutively active.\",\n      \"method\": \"Whole-cell patch-clamp in mGluR6 knockout retinal slices, capsaicin local application, immunostaining for TRPM1 and G-protein subunits\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — electrophysiology plus immunolocalization in genetic knockout, well-controlled epistasis experiment\",\n      \"pmids\": [\"22131384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Autoantibodies in melanoma-associated retinopathy (MAR) target TRPM1 cation channels of retinal ON-bipolar cells. MAR sera label TRPM1-transfected HEK cells, produce expected 180 kDa band on Western blot, colocalize with GFP in Grm6-GFP ON-bipolar cells, and do not stain Trpm1-/- retina. The targeted epitope is intracellular, and sera can be internalized by retinal cells.\",\n      \"method\": \"Immunofluorescence on TRPM1-transfected cells and retinal sections, Western blot, Trpm1-/- negative control, co-localization with Gαo and Grm6-GFP\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods with rigorous KO control, replicated by multiple labs\",\n      \"pmids\": [\"21411639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Intravitreal injection of MAR IgG (TRPM1-positive) into wild-type mouse eyes attenuated the ERG b-wave and IgG appeared in retinal ON-bipolar cells at experiment's end; this effect was absent in Trpm1-/- mice. Live incubation of retinal neurons with TRPM1-positive MAR serum resulted in selective IgG accumulation in ON-bipolar cells, dependent on TRPM1 expression, indicating autoantibody uptake via TRPM1 reduces ON-bipolar cell function.\",\n      \"method\": \"Intravitreal IgG injection with ERG recording, immunofluorescence in wild-type vs. Trpm1-/- retina, live-neuron incubation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo functional experiment with KO control, two orthogonal approaches\",\n      \"pmids\": [\"23936334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PKCα activation by DAG (via OAG analog) potentiates TRPM1 current in rod bipolar cells but not ON-cone bipolar cells. TRPM1 current is susceptible to voltage-independent inhibition by intracellular Mg2+, and PKCα activation relieves this Mg2+ inhibition, increasing transmission gain at the rod-rod bipolar cell synapse.\",\n      \"method\": \"Whole-cell patch-clamp of rod and cone bipolar cells with pharmacological DAG analog application; PKCα knockout mice; PKCα inhibitor; manipulation of intracellular Mg2+\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pharmacology plus genetic KO (PKCα-/-) with multiple ionic manipulations, two orthogonal approaches\",\n      \"pmids\": [\"21940450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Both Gαo (constitutively active form) and Gβγ bind and cooperate to close TRPM1 channels in rod bipolar cells. Phosducin or inactive Gαo (both sequester Gβγ) opened the channel. Bioluminescent energy transfer (BRET) assays revealed Gαo interacts with both N- and C-termini of TRPM1, while Gβγ interacts only with the N-terminus. Co-immunoprecipitation confirmed TRPM1 interaction with Gβ3 and active/inactive forms of Gαo.\",\n      \"method\": \"Intracellular dialysis in rod bipolar cells, BRET assay, Co-immunoprecipitation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — BRET plus Co-IP plus electrophysiology, single lab with three orthogonal methods\",\n      \"pmids\": [\"26883481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Purified recombinant TRPM1 exists predominantly as a dimer (not tetramer) as shown by blue native gels, size exclusion chromatography, cross-linking, and cryo-EM single-particle analysis with approximate 2-fold symmetry. In mouse retina, TRPM1 is present in two distinct complexes: one matching the recombinant dimer size and one much larger, suggesting additional partner subunits participate in the native transduction channel.\",\n      \"method\": \"Insect cell recombinant expression, affinity purification, blue native gels, size exclusion chromatography, chemical cross-linking, cryoelectron microscopy with single-particle analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal structural/biophysical methods in a single study with native retina validation\",\n      \"pmids\": [\"25112866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LRIT3 is essential for the localization of TRPM1 to the dendritic tips of depolarizing bipolar cells; in Lrit3nob6/nob6 mice, TRPM1 staining at the dendritic tips was severely decreased across all ON-bipolar cell types.\",\n      \"method\": \"Immunofluorescence confocal microscopy of Lrit3 knockout mouse retina sections with TRPM1 antibody\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with direct protein localization assay, single lab\",\n      \"pmids\": [\"25997951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LRIT3 is expressed presynaptically in rod photoreceptors and acts as a transsynaptic organizer; restoration of LRIT3 expression in Lrit3-/- rods (by rAAV) restores postsynaptic glutamate signalplex including TRPM1 and rescues rod-driven vision.\",\n      \"method\": \"rAAV-mediated rod-specific LRIT3 expression in Lrit3-/- retina, immunofluorescence of TRPM1 and other signalplex components, ERG\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue experiment with functional ERG readout and protein localization, demonstrates transsynaptic mechanism\",\n      \"pmids\": [\"31189098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A point mutation in the pore domain of TRPM1 (A1068T, exon 23) causes depolarizing bipolar cell dysfunction. This mutant TRPM1 protein is retained at dendritic tips but acts as a dominant negative, reducing channel function in heterozygous animals by ~32%.\",\n      \"method\": \"Chemical mutagenesis screen (ENU), complementation testing with Trpm1-/- mice, sequencing, whole-cell patch-clamp, ERG\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mutagenesis with complementation testing and electrophysiological validation\",\n      \"pmids\": [\"22896717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In human melanocytes, mGluR6 signaling positively (not negatively) enhances TRPM1 Ca2+ channel activity and increases melanin content; shRNA knockdown of TRPM1 or mGluR6 abolished L-AP4-induced Ca2+ influx and TRPM1 currents. Forced expression of Gαo in melanocytes restored negative coupling of TRPM1 to mGluR6, explaining the tissue-specific difference from retina.\",\n      \"method\": \"shRNA knockdown of TRPM1 and mGluR6, Ca2+ imaging, patch-clamp, Gαo forced expression, pertussis toxin treatment\",\n      \"journal\": \"Pigment cell & melanoma research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function combined with gain-of-function (Gαo), single lab\",\n      \"pmids\": [\"23452348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Ultrastructural immunoelectron microscopy in human retina localizes TRPM1 immunoreactivity specifically to the tips of ON-bipolar cell dendrites that invaginate cone pedicles and rod spherules. TRPM1 immunoreactivity was also occasionally found on rod spherule ribbons, suggesting a possible dual function.\",\n      \"method\": \"Immunohistochemistry at light and electron microscope level, in situ hybridization, laser dissection microscopy PCR\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ultrastructural localization with multiple complementary methods, single lab\",\n      \"pmids\": [\"21896854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Voriconazole, an antifungal agent causing visual side effects, inhibits TRPM1 channels in retinal ON-bipolar cells; it almost completely blocked capsaicin-activated TRPM1 currents and inhibited ON-bipolar cell responses evoked by mGluR6 antagonist CPPG. In contrast, voriconazole only slightly inhibited mGluR6-mediated GIRK currents, identifying TRPM1 (not mGluR6) as the primary retinal target.\",\n      \"method\": \"Mouse ERG before/after intraperitoneal voriconazole; patch-clamp of ON-bipolar cells; patch-clamp of CHO/HEK cells expressing TRPM3 or mGluR6+GIRK\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ERG plus ex vivo patch-clamp plus heterologous expression, multiple cell systems\",\n      \"pmids\": [\"25650413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TRPM1 current in ON-bipolar cells undergoes use-dependent desensitization; desensitization onset is linear above a ~20% activation threshold, reducing responses to ~40% of peak with a time constant of ~1 s, with slow recovery (>20 s). This desensitization shapes the kinetics of downstream ganglion cell EPSCs by curtailing their sustained component.\",\n      \"method\": \"Whole-cell patch-clamp of ON-bipolar cells and ganglion cells in mouse retinal slices\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — detailed patch-clamp characterization with upstream and downstream cell recordings, single lab\",\n      \"pmids\": [\"22041187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRPM1 channel opening is required for the development of the rod ON bipolar cell–AII amacrine cell pathway; deletion of TRPM1 causes abnormal contraction of rod bipolar terminals and decreased synaptic connections with amacrine cells, as well as reduced AII amacrine cell dendritic complexity. Activated Gαo interacts with TRPM1 and induces contraction of rod bipolar terminals. Overexpression of Channelrhodopsin-2 partially rescued rod bipolar development in TRPM1-/- retina.\",\n      \"method\": \"TRPM1 knockout, mGluR6 knockout, VGluT1 knockout mouse morphological comparisons; Channelrhodopsin-2 overexpression rescue; constitutively closed TRPM1 form; Co-IP of Gαo with TRPM1\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis across multiple KO lines, rescue experiment, biochemical interaction, well-controlled\",\n      \"pmids\": [\"28899920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The majority of TRPM1 in ON-bipolar cells resides in the endoplasmic reticulum (ER), not at the plasma membrane; TRPM1 colocalizes with ER markers in both heterologous cells and native mouse bipolar cell bodies, but is excluded from the Golgi. Fluorescence protease protection assays showed that both N and C termini of TRPM1 are cytoplasmic.\",\n      \"method\": \"Confocal co-localization with ER/Golgi markers, fluorescence protease protection (FPP) assay with TRPM1-GFP fusions in heterologous cells, immunostaining of mouse retina\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal localization methods, single lab\",\n      \"pmids\": [\"30027108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The N-terminal region of TRPM1 (residues A451-N566) contains a PIP2-binding site; the residue K464 is involved in PIP2 interactions, characterized by biophysical methods and molecular modeling.\",\n      \"method\": \"Biophysical methods (fluorescence spectroscopy) and molecular modeling on recombinant N-terminal TRPM1 fragment\",\n      \"journal\": \"Biophysical chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — in vitro binding with peptide fragment only, no functional channel validation, single lab\",\n      \"pmids\": [\"26544986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The N-terminal region L242-E344 of TRPM1 is an S100A1 binding domain; complex formation is calcium-dependent and is mediated by positively charged (K271, R273, R274) and hydrophobic (L263, V270, L276) residues at the N-terminus.\",\n      \"method\": \"Fluorescence spectroscopy, bioinformatics, mutagenesis of N-terminal TRPM1 fragment\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — in vitro binding with recombinant fragment, no functional validation in intact channel, single lab\",\n      \"pmids\": [\"27435061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRPM1 is a bona fide HSP90 client protein; AUY922 (HSP90 inhibitor) reduces TRPM1 expression by disrupting the CDC37-HSP90 chaperone complex as demonstrated by co-immunoprecipitation. Loss of TRPM1 mediates AUY922-induced cell apoptosis, ROS production and growth inhibition.\",\n      \"method\": \"Co-immunoprecipitation of TRPM1 with HSP90/CDC37, loss-of-function and gain-of-function in cells, iTRAQ proteomics, TUNEL, ROS assay\",\n      \"journal\": \"Journal of biomedical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating chaperone interaction plus functional loss/gain-of-function, single lab\",\n      \"pmids\": [\"34301262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRPM1 promotes acral melanoma tumor progression by elevating cytosolic Ca2+ levels, activating CaMKIIδ, promoting CaMKIIδ/AKT interaction and AKT activation. CaMKII inhibitor KN93 suppressed TRPM1-dependent colony formation, cell migration, invasion and xenograft tumor growth.\",\n      \"method\": \"Loss-of-function and gain-of-function in melanoma cells, Western blotting, colony formation, migration/invasion assays, xenograft mouse models, Ca2+ measurement\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays with pharmacological inhibition and in vivo validation, single lab\",\n      \"pmids\": [\"36585114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRPM1 has a functional role in the iris sphincter muscle; Trpm1-/- mice show severely reduced pupillary light reflex at both scotopic and photopic intensities, attributable to loss of TRPM1 in both the retina and iris sphincter muscle. Light-driven iris constriction independent of brain signaling also requires Trpm1. Capsaicin-driven (sensory) iris constriction also requires Trpm1 expression, implicating TRPM1 in pain-afferent-driven iris responses.\",\n      \"method\": \"Trpm1 knockout mice, in vivo PLR measurements, isolated eye light response assays, capsaicin pharmacology\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO phenotype across multiple light conditions and isolated eye preparation, single lab\",\n      \"pmids\": [\"34954202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Capsaicin activates TRPM1 channels in the lateral amygdala to modify LTD, via a mechanism independent of TRPV1 and involving group I mGluRs and TRPC5. This effect was absent in TRPM1-/- mice, demonstrating TRPM1 expression and function in the brain.\",\n      \"method\": \"Electrophysiology (LTD measurement) in TRPM1-/- mice, pharmacological profiling with TRPV1 antagonists and group I mGluR blockers\",\n      \"journal\": \"Neurobiology of learning and memory\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with pharmacological dissection, single lab, novel brain localization\",\n      \"pmids\": [\"27633915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Differential epitope masking by monoclonal antibodies reveals that a specific N-terminal epitope (N2d) near the transmembrane domain of TRPM1 is masked at the dendritic tips but accessible in cell bodies, suggesting formation of a synapse-specific multiprotein complex at the dendritic tip pool of TRPM1.\",\n      \"method\": \"Monoclonal antibody epitope mapping, differential immunostaining of retinal soma vs. dendritic tips, quantitative immunoblotting of synaptosome fractions\",\n      \"journal\": \"Visual neuroscience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — antibody masking is indirect evidence for a complex; no binding partners identified in this study\",\n      \"pmids\": [\"29370879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Anti-TRPM1 serum from a paraneoplastic retinopathy patient, injected intravitreally into wild-type mice, caused acute death of retinal ON-bipolar cells within 5 hours (TUNEL-positive) and chronic inner nuclear layer thinning at 3 months; no bipolar cell death was observed in TRPM1 knockout mice, confirming TRPM1-dependent antibody-mediated ON-bipolar cell degeneration.\",\n      \"method\": \"Intravitreal serum injection in wild-type and TRPM1 KO mice, ERG, TUNEL staining, immunohistochemistry, INL thickness measurement\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo injection with TRPM1 KO control demonstrating TRPM1-dependent mechanism\",\n      \"pmids\": [\"24282602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Cryo-EM structure of TRPM1 reveals a canonical tetrameric fold in the intracellular domain but a non-canonical, inverted transmembrane domain arrangement: the voltage sensor-like domain (VSLD) and pore domain (PD) are domain-swapped with opposite handedness compared to other related channels, forming a large pore-like structure consistent with ion channel function.\",\n      \"method\": \"Cryogenic electron microscopy (cryo-EM) structural determination of purified TRPM1\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure, single lab but high-resolution structural determination\",\n      \"pmids\": [\"41857038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Cryo-EM structure of human TRPM1 in conducting state reveals tetrameric assembly with an inverted (clockwise) domain-swapped pore module, dilated selectivity filter, expanded central cavity, and splayed S6 forming a wide intracellular gate. Single-channel recordings confirm constitutive activity consistent with the conductive state captured.\",\n      \"method\": \"Cryo-EM structural determination, single-channel electrophysiology\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — cryo-EM structure with functional validation, preprint not yet peer-reviewed\",\n      \"pmids\": [\"41757028\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The IG domain of LRIT3 is required for localization of TRPM1 to the DBC signalplex; restoring LRIT3 lacking the IG domain fails to restore TRPM1 expression at synapses even when Nyctalopin is correctly localized. A model is proposed where the LRIT3 LRR domain trans-synaptically binds Nyctalopin while the IG domain interacts with TRPM1.\",\n      \"method\": \"rAAV-expressed LRIT3 deletion constructs in Lrit3-/- retina, immunofluorescence of TRPM1 and signalplex components, ERG\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific rescue in genetic KO with functional readout, preprint, single lab\",\n      \"pmids\": [\"41757028\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"TRPM1 is a constitutively active, nonselective cation channel with an inverted transmembrane domain topology localized primarily to the postsynaptic dendritic tips of retinal ON-bipolar cells, where it serves as the effector channel of the mGluR6–Go signal transduction cascade: in darkness, glutamate activates mGluR6, which couples to Go, releasing Gβγ (and activated Gαo) to close TRPM1, while light reduces glutamate release and allows TRPM1 to open, producing the depolarizing b-wave response; TRPM1 targeting to the dendritic tip signalplex requires transsynaptic scaffolding by LRIT3 (via its IG domain interacting with TRPM1) and nyctalopin, and is mGluR6-dependent; additional regulation includes Mg2+-dependent inhibition relieved by PKCα, PIP2 and S100A1 interactions at the N-terminus, and HSP90 chaperone-dependent folding, while in melanocytes TRPM1 mediates Ca2+ influx coupled positively to mGluR6 to support melanogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRPM1 is a constitutively active, nonselective cation channel that serves as the effector channel of the depolarizing light response in retinal ON-bipolar cells, where its genetic deletion abolishes the ERG b-wave and the photoresponse [#0, #1]. Localized to the dendritic tips of ON-bipolar cells co-localizing with mGluR6, TRPM1 is gated by the mGluR6\\u2013Go cascade: it is closed when Go is activated, with both G\\u03b2\\u03b3 dimer and the constitutively active form of G\\u03b1o binding and cooperating to close the channel\\u2014G\\u03b2\\u03b3 interacting with the N-terminus and G\\u03b1o with both N- and C-termini\\u2014while sequestration of G\\u03b2\\u03b3 opens it [#1, #6, #12]. Channel activity is further tuned by relief of voltage-independent intracellular Mg2+ inhibition through PKC\\u03b1 activation, which raises synaptic transmission gain, and by use-dependent desensitization that shapes downstream ganglion cell responses [#11, #20]. Targeting of TRPM1 to the postsynaptic dendritic-tip signalplex requires a transsynaptic scaffold: TRPM1 forms an in vivo complex with nyctalopin, its localization is mGluR6-dependent, and presynaptic LRIT3\\u2014via its IG domain\\u2014organizes signalplex assembly and TRPM1 retention at the synapse [#5, #8, #14, #15]. Beyond gating, channel opening drives the developmental wiring of the rod ON-bipolar\\u2013AII amacrine pathway, and TRPM1 also functions in the iris sphincter muscle to mediate the pupillary light reflex [#21, #27]. Structurally, TRPM1 is a tetrameric channel with a non-canonical, inverted domain-swapped transmembrane arrangement and a wide conductive pore [#31]. In melanocytes TRPM1 conducts Ca2+, supports Ca2+ homeostasis and melanogenesis under MITF transcriptional control, and is positively coupled to mGluR6\\u2014a tissue-specific reversal of its retinal polarity explained by the relative absence of G\\u03b1o [#2, #3, #4, #17]. Clinically, TRPM1 is the autoantigen in melanoma-associated retinopathy, where patient autoantibodies are taken up by ON-bipolar cells in a TRPM1-dependent manner, attenuate the b-wave, and drive ON-bipolar cell degeneration [#9, #10, #30].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established TRPM1 as the long-sought effector channel of the retinal ON-bipolar cell light response, answering what carries the depolarizing current downstream of mGluR6.\",\n      \"evidence\": \"TRPM1 knockout mouse ERG and patch-clamp of ON-bipolar cells, immunolocalization with mGluR6, and heterologous reconstitution with Go manipulation\",\n      \"pmids\": [\"19861548\", \"19966281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define which Go subunit (G\\u03b1 vs G\\u03b2\\u03b3) closes the channel\", \"Mechanism of constitutive activity not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed TRPM1 conducts an endogenous cation current in melanocytes and supports Ca2+-dependent melanogenesis, extending its function beyond retina to pigment biology.\",\n      \"evidence\": \"Endogenous current recording, microRNA and shRNA knockdown, Ca2+ and tyrosinase/melanin assays, p53 repression in primary human melanocytes and melanoma cells\",\n      \"pmids\": [\"19436059\", \"19587221\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Predominantly intracellular vesicular localization in melanoma cells leaves plasma-membrane gating unclear\", \"Single-lab functional readouts\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified MITF-driven, E-box/M-box-dependent melanocyte-specific transcription of TRPM1 and multiple splice/cleavage isoforms, defining how the gene is regulated in pigment cells.\",\n      \"evidence\": \"Promoter deletion analysis, MITF activation assay, Western blot in melanocytes/melanoma cells\",\n      \"pmids\": [\"15577322\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional roles of distinct isoforms not assigned\", \"Retinal transcriptional control not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated that TRPM1 is a plasma-membrane channel that can heteromultimerize with TRPM3 and is inhibited by extracellular zinc through a defined pore stretch, characterizing intrinsic channel properties.\",\n      \"evidence\": \"Heterologous expression patch-clamp, pore mutagenesis, heteromultimer co-expression, zinc inhibition assays\",\n      \"pmids\": [\"21278253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of TRPM1/TRPM3 heteromers in retina not established\", \"Did not address native gating by G-proteins\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined the transsynaptic scaffolding required to deliver TRPM1 to the dendritic-tip signalplex, answering how the channel is positioned at the synapse.\",\n      \"evidence\": \"Proteomic pulldown of TRPM1\\u2013nyctalopin complex from retina and immunolocalization in mGluR6-knockout retina; capsaicin testing in mGluR6-null bipolar cells\",\n      \"pmids\": [\"21832182\", \"22131384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the factor conferring constitutive activity\", \"Direct binding interfaces not mapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the G-protein gating mechanism, showing G\\u03b2\\u03b3 (and later cooperatively G\\u03b1o) closes TRPM1 and defining the N-/C-terminal interaction sites.\",\n      \"evidence\": \"Intracellular dialysis of G\\u03b2\\u03b3/G\\u03b1o across multiple cell types, GPCR pharmacology, BRET and Co-IP\",\n      \"pmids\": [\"22586107\", \"26883481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of G-protein-induced closure not visualized\", \"Stoichiometry of G-protein:channel binding unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed PKC\\u03b1 and use-dependent desensitization tune TRPM1 gain and kinetics, explaining synaptic signal shaping at the rod-bipolar synapse.\",\n      \"evidence\": \"Patch-clamp with DAG analog, PKC\\u03b1 knockout, Mg2+ manipulation, and ganglion cell EPSC recordings\",\n      \"pmids\": [\"21940450\", \"22041187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PKC\\u03b1 phosphorylation site on TRPM1 not identified\", \"Molecular basis of desensitization unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified TRPM1 as the autoantigen in melanoma-associated retinopathy, linking the channel to a paraneoplastic disease.\",\n      \"evidence\": \"MAR serum immunofluorescence on TRPM1-transfected and Grm6-GFP cells, Western blot, Trpm1-/- negative control\",\n      \"pmids\": [\"21411639\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise intracellular epitope not finely mapped here\", \"Pathogenic mechanism not yet demonstrated in vivo\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided a disease-relevant pore mutation (A1068T) acting as a dominant negative, validating the pore domain's role in channel function and bipolar cell dysfunction.\",\n      \"evidence\": \"ENU mutagenesis, complementation testing with Trpm1-/-, sequencing, patch-clamp and ERG\",\n      \"pmids\": [\"22896717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural consequence of A1068T not determined\", \"Human genotype correlation not addressed here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that MAR autoantibodies are internalized via TRPM1 and cause TRPM1-dependent ON-bipolar cell dysfunction and degeneration, establishing disease causation.\",\n      \"evidence\": \"Intravitreal IgG/serum injection in wild-type vs Trpm1-/- mice, ERG, TUNEL, INL thickness, live-neuron uptake assays\",\n      \"pmids\": [\"23936334\", \"24282602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which internalized antibody impairs/destroys cells unresolved\", \"Whether antibody blocks channel directly not determined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Explained the tissue-specific reversal of TRPM1\\u2013mGluR6 coupling, showing positive coupling in melanocytes that converts to negative coupling upon G\\u03b1o expression.\",\n      \"evidence\": \"shRNA knockdown of TRPM1/mGluR6, Ca2+ imaging, patch-clamp, forced G\\u03b1o expression, pertussis toxin in melanocytes\",\n      \"pmids\": [\"23452348\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding\", \"Endogenous melanocyte G-protein milieu not fully characterized\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Provided the first biophysical/structural insight into TRPM1 assembly, showing a recombinant dimer plus a larger native complex, indicating additional native subunits.\",\n      \"evidence\": \"Recombinant purification, blue native gels, SEC, cross-linking, cryo-EM single-particle analysis, native retina complexes\",\n      \"pmids\": [\"25112866\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of additional native subunits not determined\", \"Dimer vs tetramer discrepancy with later structures unresolved at the time\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established LRIT3 as essential for dendritic-tip localization of TRPM1, deepening the model of signalplex assembly.\",\n      \"evidence\": \"Immunofluorescence of Lrit3 knockout retina with TRPM1 antibody\",\n      \"pmids\": [\"25997951\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct LRIT3\\u2013TRPM1 binding not shown in this study\", \"Mechanism of localization downstream of LRIT3 unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined LRIT3 as a presynaptic transsynaptic organizer whose rod-specific restoration rescues the postsynaptic signalplex and vision, clarifying directional assembly.\",\n      \"evidence\": \"rAAV rod-specific LRIT3 expression in Lrit3-/-, signalplex immunofluorescence, ERG\",\n      \"pmids\": [\"31189098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular interactions bridging presynaptic LRIT3 to postsynaptic TRPM1 not detailed here\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed a developmental role for TRPM1 channel opening in wiring the rod bipolar\\u2013AII amacrine pathway, beyond acute signal transduction.\",\n      \"evidence\": \"Comparative morphology across Trpm1, mGluR6, VGluT1 knockouts, Channelrhodopsin-2 rescue, constitutively closed TRPM1, Co-IP of G\\u03b1o\",\n      \"pmids\": [\"28899920\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling linking channel activity to synaptic morphogenesis unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed most TRPM1 resides in the ER rather than the plasma membrane and that both termini are cytoplasmic, refining channel topology and trafficking.\",\n      \"evidence\": \"Confocal co-localization with ER/Golgi markers, fluorescence protease protection assay, retina immunostaining\",\n      \"pmids\": [\"30027108\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of the ER-resident pool not defined\", \"Trafficking signals controlling surface delivery unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified candidate N-terminal regulatory ligand-binding sites for PIP2 and Ca2+-dependent S100A1, suggesting additional modulatory inputs to the channel.\",\n      \"evidence\": \"Fluorescence spectroscopy, mutagenesis and molecular modeling on recombinant N-terminal TRPM1 fragments\",\n      \"pmids\": [\"26544986\", \"27435061\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"In vitro fragment binding only, no functional channel validation\", \"Physiological relevance in intact channel unestablished\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined TRPM1 as an HSP90/CDC37 client whose chaperone-dependent stability links it to apoptosis and ROS regulation in cells.\",\n      \"evidence\": \"Co-IP of TRPM1 with HSP90/CDC37, HSP90 inhibitor, loss/gain-of-function, iTRAQ, TUNEL, ROS assays\",\n      \"pmids\": [\"34301262\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding\", \"Relevance to retinal TRPM1 folding not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended TRPM1 function to the iris sphincter muscle and pupillary light reflex, demonstrating roles outside ON-bipolar cells.\",\n      \"evidence\": \"Trpm1 knockout PLR measurements, isolated eye light response, capsaicin pharmacology\",\n      \"pmids\": [\"34954202\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular pathway in iris muscle not defined\", \"Single-lab phenotype\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated TRPM1 expression and function in the lateral amygdala modulating LTD, identifying a brain role distinct from TRPV1.\",\n      \"evidence\": \"LTD electrophysiology in Trpm1-/- mice with TRPV1 and group I mGluR pharmacology\",\n      \"pmids\": [\"27633915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking TRPM1 to TRPC5 and group I mGluRs unresolved\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked melanocyte TRPM1 Ca2+ signaling to acral melanoma progression through a CaMKII\\u03b4\\u2013AKT axis, defining an oncogenic mechanism.\",\n      \"evidence\": \"Loss/gain-of-function in melanoma cells, Western blot, migration/invasion/colony assays, CaMKII inhibitor, xenografts\",\n      \"pmids\": [\"36585114\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CaMKII\\u03b4 activation by TRPM1-mediated Ca2+ not biochemically isolated\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Resolved the TRPM1 structure as a tetramer with a non-canonical inverted, domain-swapped transmembrane fold and a wide conductive pore, explaining its constitutive activity.\",\n      \"evidence\": \"Cryo-EM structural determination of purified TRPM1 and human TRPM1 in conducting state with single-channel recordings\",\n      \"pmids\": [\"41857038\", \"41757028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of G-protein-induced closure not captured\", \"Conformational changes during gating not visualized\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the mGluR6\\u2013Go\\u2013G\\u03b2\\u03b3/G\\u03b1o gating signal is structurally transmitted to open and close the inverted TRPM1 pore, and the full composition of the native dendritic-tip signalplex, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No closed-state structure with bound G-proteins\", \"Additional native subunits beyond nyctalopin/LRIT3 not identified\", \"Mechanism converting channel activity to developmental wiring unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005262\", \"supporting_discovery_ids\": [1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 7, 18]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [22]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 12, 17]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [0, 27]}\n    ],\n    \"complexes\": [\n      \"TRPM1\\u2013nyctalopin\\u2013mGluR6 dendritic-tip signalplex\",\n      \"HSP90\\u2013CDC37 chaperone complex\"\n    ],\n    \"partners\": [\n      \"GRM6\",\n      \"NYX\",\n      \"LRIT3\",\n      \"GNAO1\",\n      \"PRKCA\",\n      \"TRPM3\",\n      \"HSP90\",\n      \"CDC37\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}