{"gene":"MPP4","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":2001,"finding":"MPP4 was cloned as a retina-specific member of the p55 subfamily of MAGUK proteins, encoding a 637 amino acid protein with PDZ, SH3, and guanylate kinase-like (GUK) domains. High expression was demonstrated specifically in human retinal tissue, and genomic co-localization with the RP26 locus on chromosome 2q31-33 was identified, implicating MPP4 as a candidate gene for inherited retinopathy.","method":"EST expression profiling, cDNA cloning, sequence alignment, RT-PCR","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — original cloning with sequence characterization and expression validation; single study","pmids":["11414766"],"is_preprint":false},{"year":2003,"finding":"MPP4 protein localizes to the connecting cilia and synaptic terminals of cone and rod photoreceptors in bovine and porcine retinas, as well as postsynaptic structures in the outer plexiform layer and three bands in the inner plexiform layer, suggesting roles at membrane-cytoskeleton interfaces in distinct photoreceptor compartments.","method":"Immunofluorescence microscopy using affinity-purified anti-MPP4 antibodies on retinal sections; Western blot of retinal extracts and transfected cells","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization by immunofluorescence with specific antibodies; single lab","pmids":["14638699"],"is_preprint":false},{"year":2003,"finding":"Mouse Mpp4 is expressed postnatally (not embryonically) in retina, exclusively in photoreceptor cells including pineal gland, and Mpp4 protein localizes specifically at rod (but not cone) photoreceptor synaptic terminals, suggesting a role in targeting and assembly of specific molecules such as calcium channels at rod synapses.","method":"Microarray, real-time RT-PCR, in situ hybridization, immunofluorescence on retinal sections from wild-type and cone-specific GFP transgenic mice","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods confirming localization; single lab","pmids":["12859944"],"is_preprint":false},{"year":2002,"finding":"MPP4 contains an L27 domain (in addition to PDZ, SH3, and GUK domains) involved in protein-protein interactions, and a retina-specific isoform lacking 71 amino acids including the L27 domain was identified. MPP4 expression was confirmed to be highest in retina and also present in brain, with in situ hybridization localizing expression to photoreceptor cells.","method":"RT-PCR, RNA in situ hybridization, mutation analysis of MPP4 ORF in RP26 family and 300 RP patients","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — domain characterization and isoform identification with functional context; single lab","pmids":["12384283"],"is_preprint":false},{"year":2004,"finding":"MPP4 is a novel member of the CRB1-associated protein scaffold in the retina, colocalizing with CRB1 and MPP5 (PALS1) at the outer limiting membrane (OLM). MPP5 associates with both Mupp1 and Mpp4 at the sub-apical region adjacent to adherens junctions in photoreceptors.","method":"Immunohistochemistry, confocal microscopy on Crb1-/- mouse retinas; co-immunoprecipitation","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP and co-localization in mouse retina; single study","pmids":["15316081"],"is_preprint":false},{"year":2005,"finding":"MPP4 directly interacts with MPP5 (PALS1) to be recruited into the CRB1 protein scaffold at the outer limiting membrane. 3D homology modeling provided evidence for a mechanism regulating homo- and heterodimer formation of MPP4 and MPP5 via their L27 domains. Yeast two-hybrid screening, GST pull-down, and immunoprecipitation validated MPP4-MPP5 direct interaction, and immunoelectron microscopy confirmed co-localization at the OLM.","method":"Yeast two-hybrid, GST pull-down, immunoprecipitation, immunohistochemistry, immunoelectron microscopy, 3D homology modeling","journal":"Investigative ophthalmology & visual science","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (Y2H, GST pulldown, Co-IP, structural modeling, immunoEM); single lab but strong methods","pmids":["15914641"],"is_preprint":false},{"year":2005,"finding":"MPP4 localizes specifically to the synaptic terminals of photoreceptors (outer plexiform layer), distinct from MPP5 which localizes to apical OLM junctions. MPP4 directly interacts with Veli proteins (Veli1, Veli2, Veli3) via L27 heterodimerization in vitro. Veli3 co-localizes with MPP4 at photoreceptor synaptic terminals, suggesting MPP4 recruits Veli3 and its binding partners to this specialized region.","method":"In vitro L27 heterodimerization assay, immunofluorescence microscopy with specific polyclonal and monoclonal antibodies, co-localization studies in mouse retina","journal":"The Journal of comparative neurology","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro binding assay plus immunolocalization in native tissue; single lab, multiple orthogonal methods","pmids":["15558731"],"is_preprint":false},{"year":2006,"finding":"Mpp4 knockout mice show that Mpp4 is essential for correct localization of Psd95 and Veli3 at the presynaptic photoreceptor membrane in the outer plexiform layer. Loss of Mpp4 leads to absence of Psd95 from presynaptic membranes of rods and cones and a significant reduction in total Psd95 protein levels, suggesting Mpp4 is involved in Psd95 turnover. Veli3 protein levels are unchanged. The Crb complex at the OLM is unaffected in Mpp4 knockouts.","method":"Mpp4 knockout mouse analysis, immunohistochemistry, Western blotting, scanning laser ophthalmology, electroretinography","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined molecular phenotypes (loss of Psd95 and Veli3 from presynaptic membrane); single lab, multiple methods","pmids":["16520334"],"is_preprint":false},{"year":2006,"finding":"MPP3 and Mpp4 both co-localize with DLG1 at the outer plexiform layer, and mouse Dlg1 forms separate complexes with Mpp3 and Mpp4 in vivo, identifying two distinct MAGUK scaffolding complexes at the photoreceptor synapse.","method":"Co-immunoprecipitation from mouse retina, immunohistochemistry, confocal microscopy","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2–3 — co-IP from native tissue plus localization; single lab","pmids":["16519681"],"is_preprint":false},{"year":2007,"finding":"Mpp4 is required for correct localization of plasma membrane Ca2+-ATPases (PMCAs) at rod photoreceptor synaptic terminals. In Mpp4-deficient mice, PMCAs are lost from presynaptic membranes; synaptic ribbons are enlarged (correlated with elevated Ca2+); SERCA2 levels increase and IP3RII distribution shifts away from synaptic terminals as compensatory responses. Mpp4 organizes a presynaptic complex including PMCAs, Veli3, and PSD95 that modulates Ca2+ homeostasis and synaptic transmission.","method":"Mpp4 knockout mouse analysis, immunohistochemistry, Western blotting, electroretinography, electron microscopy of synaptic ribbons, co-immunoprecipitation","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — KO with multiple defined molecular and ultrastructural phenotypes, co-IP validation; single lab but multiple orthogonal methods","pmids":["17341488"],"is_preprint":false},{"year":2008,"finding":"Proteomic analysis of the MPP4-associated complex in mouse retina by immunoaffinity chromatography, 2D electrophoresis, and mass spectrometry identified Veli3, PSD95-beta (via L27 domain interaction), recoverin, and Hsc70 as components. The interaction of MPP4 specifically with the PSD95-beta isoform (not alpha) is mediated by their N-terminal L27 domains.","method":"Immunoaffinity chromatography with monoclonal anti-MPP4 antibody, 2D-PAGE, mass spectrometry, co-immunoprecipitation, L27 domain interaction assays","journal":"Experimental eye research","confidence":"High","confidence_rationale":"Tier 1–2 — unbiased proteomics plus targeted co-IP and domain mapping; single lab, multiple orthogonal methods","pmids":["18955048"],"is_preprint":false},{"year":2009,"finding":"TMEM16B, a Ca2+-dependent chloride channel, co-localizes with MPP4, PSD95, and VELI3 at photoreceptor ribbon synapses and is lost from photoreceptor membranes in MPP4-deficient mice, demonstrating that TMEM16B is recruited to photoreceptor presynaptic membranes via the MPP4-containing protein complex.","method":"Immunofluorescence co-localization in mouse retina, MPP4-knockout mouse analysis, Western blotting, electrophysiology (patch-clamp and halide-sensitive fluorescent protein assays for channel activity)","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — KO mouse showing loss of TMEM16B from membranes, co-localization, and functional channel characterization; single lab, multiple methods","pmids":["19474308"],"is_preprint":false},{"year":2009,"finding":"Both MPP4 and PSD95beta are essential for correct localization of PMCA at the photoreceptor presynaptic plasma membrane. C-terminal truncation of MPP4 causes loss of PSD95 and PMCA mislocalization. Silencing of Psd95 results in loss of presynaptic MPP4 and PMCA1, and expression of PSD95beta (but not alpha) via lentiviral delivery restores PMCA1 and MPP4 plasma membrane localization in Mpp4 mutant retinal explants, demonstrating isoform-specific interdependence.","method":"Mpp4 and Psd95 mutant mouse analysis, lentivirus-mediated molecular replacement in primary retinal explants, immunofluorescence, Western blotting","journal":"Molecular and cellular neurosciences","confidence":"High","confidence_rationale":"Tier 2 — rescue experiment with isoform-specific replacement plus KO phenotype; single lab, multiple orthogonal approaches","pmids":["19233278"],"is_preprint":false},{"year":2018,"finding":"CRX (cone-rod homeobox) transcription factor controls expression of MPP4 in photoreceptors, as validated by aberrant/reduced MPP4 immunostaining in Crx-null and dominant Crx-mutant retinas, placing MPP4 downstream of CRX in the regulatory pathway governing presynaptic active zone organization.","method":"Immunohistochemistry in Crx-/-, CrxRip/+ and CrxRip/Rip mouse retinas; integration with CRX- and NRL-ChIP-Seq data; transcriptome analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 — IHC validation combined with ChIP-seq; single lab","pmids":["30084954"],"is_preprint":false}],"current_model":"MPP4 is a retina-specific MAGUK scaffolding protein of the p55 subfamily that localizes to photoreceptor synaptic terminals (outer plexiform layer) and the outer limiting membrane, where it is recruited into the CRB1 complex via direct L27-domain-mediated interaction with MPP5/PALS1, and in turn organizes a presynaptic scaffold by recruiting PSD95-beta (via L27 heterodimerization), Veli3 (via L27 heterodimerization), plasma membrane Ca2+-ATPases (PMCAs), and TMEM16B, thereby modulating presynaptic Ca2+ homeostasis and synaptic transmission in rod photoreceptors."},"narrative":{"teleology":[{"year":2001,"claim":"Identification of MPP4 as a novel retina-enriched MAGUK established that a previously uncharacterized p55-subfamily member might function specifically in photoreceptor biology and could underlie RP26-linked retinopathy.","evidence":"cDNA cloning, EST profiling, RT-PCR, and chromosomal mapping in human retina","pmids":["11414766"],"confidence":"Medium","gaps":["No pathogenic mutations found in RP26 patients","Functional role unknown","Protein-level localization not determined"]},{"year":2003,"claim":"Localization studies resolved where MPP4 acts, placing it at photoreceptor synaptic terminals (outer plexiform layer) and connecting cilia, with rod-specific expression emerging postnatally in mouse — narrowing its function to postnatal synaptic organization rather than photoreceptor development.","evidence":"Immunofluorescence on bovine, porcine, and mouse retinal sections; in situ hybridization; microarray and RT-PCR","pmids":["14638699","12859944"],"confidence":"Medium","gaps":["Binding partners at the synapse unknown","Discrepancy between species on cone vs. rod expression","Functional consequence of synaptic localization not tested"]},{"year":2005,"claim":"Biochemical studies answered how MPP4 is integrated into retinal scaffolds: L27-domain-mediated direct interaction with MPP5/PALS1 recruits MPP4 into the CRB1 complex at the OLM, while L27 heterodimerization with Veli3 positions MPP4 as an organizer of a distinct presynaptic complex.","evidence":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunoelectron microscopy, and 3D homology modeling in retina and in vitro","pmids":["15914641","15558731"],"confidence":"High","gaps":["Whether MPP4's OLM role is functionally important vs. dispensable was untested","No loss-of-function data yet","Full composition of the presynaptic complex unknown"]},{"year":2006,"claim":"Generation of Mpp4-knockout mice demonstrated that MPP4 is essential for anchoring PSD95 and Veli3 at rod presynaptic membranes, while the CRB1 complex at the OLM is unaffected — resolving that MPP4's primary non-redundant function is synaptic, not junctional.","evidence":"Mpp4 knockout mouse: immunohistochemistry, Western blotting, electroretinography, scanning laser ophthalmoscopy","pmids":["16520334"],"confidence":"High","gaps":["Mechanism by which loss of MPP4 destabilizes PSD95 (degradation vs. mistargeting) not resolved","Whether synaptic transmission is functionally impaired remained unclear","Interaction with DLG1 identified but functional significance unknown"]},{"year":2007,"claim":"Analysis of Mpp4-null retinas revealed that MPP4 is required for PMCA localization at rod synapses and that its loss leads to Ca²⁺ dysregulation (enlarged ribbons, compensatory SERCA2 upregulation), establishing MPP4 as a master organizer of presynaptic Ca²⁺ homeostasis.","evidence":"Mpp4 knockout mouse: co-immunoprecipitation, electron microscopy of synaptic ribbons, immunohistochemistry, Western blot, ERG","pmids":["17341488"],"confidence":"High","gaps":["Direct physical interaction between MPP4 and PMCA not demonstrated","Quantitative Ca²⁺ measurements not performed","Whether cone synapses are affected unresolved"]},{"year":2008,"claim":"Unbiased proteomic characterization of the MPP4-associated complex identified PSD95-beta (not alpha) as the specific isoform recruited via L27 domain interaction, along with recoverin and Hsc70, refining the molecular architecture of the presynaptic scaffold.","evidence":"Immunoaffinity chromatography with anti-MPP4 antibody, 2D-PAGE, mass spectrometry, co-IP, and L27 domain mapping from mouse retina","pmids":["18955048"],"confidence":"High","gaps":["Functional roles of recoverin and Hsc70 within the complex unknown","Stoichiometry and structural arrangement not determined"]},{"year":2009,"claim":"Two studies resolved the functional interdependence within the MPP4 scaffold: TMEM16B (a Ca²⁺-dependent Cl⁻ channel) is lost from photoreceptor membranes in Mpp4-null mice, and isoform-specific rescue with PSD95-beta restores both MPP4 and PMCA1 membrane localization, demonstrating that MPP4 and PSD95-beta cooperatively anchor ion-regulatory proteins at the presynaptic membrane.","evidence":"Mpp4 and Psd95 mutant mice, lentiviral molecular replacement in retinal explants, patch-clamp electrophysiology, immunofluorescence, Western blotting","pmids":["19474308","19233278"],"confidence":"High","gaps":["Whether TMEM16B directly binds MPP4 or is recruited indirectly unknown","In vivo electrophysiological consequences for visual function not fully characterized"]},{"year":2018,"claim":"Identification of CRX as a transcriptional regulator of MPP4 placed the gene within the photoreceptor-specific gene regulatory network governing synaptogenesis, linking upstream transcription factor control to presynaptic scaffold assembly.","evidence":"Immunohistochemistry in Crx-null and dominant Crx-mutant mouse retinas integrated with CRX and NRL ChIP-Seq datasets","pmids":["30084954"],"confidence":"Medium","gaps":["Whether CRX directly binds the Mpp4 promoter or acts indirectly not fully resolved","Other transcription factors regulating MPP4 not identified"]},{"year":null,"claim":"Key unresolved questions include whether MPP4 mutations cause human retinal disease, the atomic-resolution structure of the MPP4 presynaptic scaffold, the direct vs. indirect nature of MPP4-PMCA and MPP4-TMEM16B interactions, and the precise electrophysiological impact of MPP4 loss on rod synaptic transmission in vivo.","evidence":"","pmids":[],"confidence":"Low","gaps":["No causative MPP4 mutations identified in human retinal dystrophy patients","No crystal or cryo-EM structure of the MPP4-containing complex","In vivo single-cell recordings from Mpp4-null rods not performed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,6,7,9,10,11,12]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[7,9,11,12]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,2,6,7,9,11,12]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[7,9,11,12]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[7,9,11,12]}],"complexes":["CRB1 apical complex (at OLM)","MPP4-PSD95beta-Veli3 presynaptic scaffold"],"partners":["MPP5","DLG4","VELI3","PMCA","ANO2","DLG1","CRB1"],"other_free_text":[]},"mechanistic_narrative":"MPP4 is a retina-specific MAGUK scaffolding protein that organizes presynaptic protein complexes at rod photoreceptor ribbon synapses, thereby regulating calcium homeostasis and synaptic transmission. It contains PDZ, SH3, guanylate kinase-like (GUK), and L27 domains; the L27 domain mediates heterodimerization with MPP5/PALS1 (recruiting MPP4 into the CRB1 complex at the outer limiting membrane), with PSD95-beta (isoform-specific), and with Veli3, assembling a scaffold that anchors plasma membrane Ca²⁺-ATPases (PMCAs) and the Ca²⁺-dependent chloride channel TMEM16B at the presynaptic membrane [PMID:15914641, PMID:18955048, PMID:19474308]. Mpp4-knockout mice lose PMCA, PSD95, and TMEM16B from rod synaptic terminals, develop enlarged synaptic ribbons indicative of elevated presynaptic Ca²⁺, and show compensatory upregulation of SERCA2, establishing MPP4 as essential for presynaptic Ca²⁺ extrusion and ion channel localization [PMID:17341488, PMID:16520334, PMID:19233278]. MPP4 expression is controlled by the photoreceptor transcription factor CRX, placing it within the CRX-dependent gene regulatory network for synaptogenesis [PMID:30084954]."},"prefetch_data":{"uniprot":{"accession":"Q96JB8","full_name":"MAGUK p55 subfamily member 4","aliases":["Amyotrophic lateral sclerosis 2 chromosomal region candidate gene 5 protein","Discs large homolog 6"],"length_aa":637,"mass_kda":72.8,"function":"May play a role in retinal photoreceptors development","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q96JB8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MPP4","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MPP4","total_profiled":1310},"omim":[{"mim_id":"619030","title":"SKELETAL MUSCLE GLYCOGEN CONTENT AND METABOLISM QUANTITATIVE TRAIT LOCUS; SMGMQTL","url":"https://www.omim.org/entry/619030"},{"mim_id":"612332","title":"LIN7 HOMOLOG C, CRUMBS CELL POLARITY COMPLEX COMPONENT; LIN7C","url":"https://www.omim.org/entry/612332"},{"mim_id":"606575","title":"MEMBRANE PROTEIN, PALMITOYLATED 4; MPP4","url":"https://www.omim.org/entry/606575"},{"mim_id":"604976","title":"PROTEIN KINASE, AMP-ACTIVATED, NONCATALYTIC, GAMMA-3; PRKAG3","url":"https://www.omim.org/entry/604976"},{"mim_id":"603182","title":"INTERLEUKIN ENHANCER-BINDING FACTOR 3; ILF3","url":"https://www.omim.org/entry/603182"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Actin filaments","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"retina","ntpm":265.2}],"url":"https://www.proteinatlas.org/search/MPP4"},"hgnc":{"alias_symbol":[],"prev_symbol":["DLG6"]},"alphafold":{"accession":"Q96JB8","domains":[{"cath_id":"-","chopping":"88-132","consensus_level":"medium","plddt":88.902,"start":88,"end":132},{"cath_id":"2.30.42.10","chopping":"154-233","consensus_level":"high","plddt":89.1489,"start":154,"end":233},{"cath_id":"2.30.30.40","chopping":"246-317","consensus_level":"high","plddt":89.0076,"start":246,"end":317},{"cath_id":"3.40.50.300","chopping":"382-390_422-630","consensus_level":"medium","plddt":88.036,"start":382,"end":630}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96JB8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96JB8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96JB8-F1-predicted_aligned_error_v6.png","plddt_mean":76.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MPP4","jax_strain_url":"https://www.jax.org/strain/search?query=MPP4"},"sequence":{"accession":"Q96JB8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96JB8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96JB8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96JB8"}},"corpus_meta":[{"pmid":"15316081","id":"PMC_15316081","title":"Crumbs 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/21642987","citation_count":405,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":25344,"output_tokens":3148,"usd":0.061626},"stage2":{"model":"claude-opus-4-6","input_tokens":6411,"output_tokens":2526,"usd":0.142808},"total_usd":0.453835,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":36727,"output_tokens":5457,"usd":0.096018},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":7336,"output_tokens":2623,"usd":0.153383}},"stage1_raw":"Looking at the corpus, I need to identify which papers are about the retinal MAGUK scaffolding protein MPP4 versus other uses of \"MPP4\" (e.g., hematopoietic multipotent progenitor 4 cells, CT texture parameter \"mean of positive pixels 4\", etc.). The retinal MPP4 (membrane palmitoylated protein 4) is the gene of interest here.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"MPP4 was cloned as a retina-specific MAGUK protein containing a PDZ domain, SH3 region, and guanylate kinase-like (GUK) domain, placing it in the p55 subfamily of membrane-associated guanylate kinases that serve as molecular scaffolds for multiprotein complexes at specialized plasma membrane regions.\",\n      \"method\": \"Full-length cDNA cloning, sequence alignment, domain analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — original cloning paper with domain characterization; single lab but foundational structural characterization\",\n      \"pmids\": [\"11414766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MPP4 protein localizes specifically to the connecting cilia and synaptic terminals of cone and rod photoreceptors in bovine and porcine retina, suggesting roles at membrane-cytoskeleton interfaces in distinct structural and functional compartments.\",\n      \"method\": \"Immunofluorescence microscopy with affinity-purified anti-MPP4 antibodies on bovine and porcine retinal sections; Western blot of transfected cells\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with specific antibodies; single lab\",\n      \"pmids\": [\"14638699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Mpp4 expression in mouse retina is restricted exclusively to photoreceptor cells (postnatal, not embryonic), and the Mpp4 protein localizes specifically to rod (but not cone) photoreceptor synaptic terminals.\",\n      \"method\": \"Microarray analysis, real-time RT-PCR, in situ hybridization, immunofluorescence on wild-type and cone-specific GFP transgenic mice\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods for localization; single lab\",\n      \"pmids\": [\"12859944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MPP4 is associated with CRB1, MUPP1, and PALS1/MPP5 at the sub-apical region adjacent to the adherens junction complex at the outer limiting membrane in the retina.\",\n      \"method\": \"Co-immunoprecipitation and immunolocalization in mouse retina\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP and colocalization; replicated across multiple labs in subsequent papers\",\n      \"pmids\": [\"15316081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MPP4 directly interacts with MPP5 (PALS1) via their L27 domains, and MPP5 recruits MPP4 into the CRB1 complex at the outer limiting membrane (OLM) of the retina; 3D homology modeling indicated a mechanism regulating homo- and heterodimer formation of MPP4 and MPP5.\",\n      \"method\": \"Yeast two-hybrid screening, GST pull-down, co-immunoprecipitation, immunohistochemistry, immunoelectron microscopy, 3D homology modeling\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (Y2H, GST pulldown, co-IP, structural modeling) in single study; replicated by other labs\",\n      \"pmids\": [\"15914641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MPP4 directly interacts with Veli proteins (Veli1, Veli2, Veli3) via L27 heterodimerization in vitro, and colocalizes with Veli3 at photoreceptor synaptic terminals in the outer plexiform layer (OPL), whereas MPP5 associates with Veli3 at the outer limiting membrane (OLM).\",\n      \"method\": \"In vitro L27 heterodimerization assay, immunofluorescence microscopy with specific antibodies\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct in vitro interaction assay plus localization; independently consistent with other labs' findings\",\n      \"pmids\": [\"15558731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In Mpp4 knockout mice, Psd95 is lost from presynaptic membranes of rods and cones and total retinal Psd95 protein levels are significantly reduced, demonstrating that Mpp4 is essential for correct localization and turnover of Psd95 at the presynaptic photoreceptor membrane. Veli3 localization is also disrupted. Mpp4 thus coordinates Psd95/Veli3 assembly and maintenance at synaptic membranes.\",\n      \"method\": \"Mpp4 knockout mouse model, immunohistochemistry, scanning laser ophthalmology, Western blot, electroretinography\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined molecular and cellular phenotype; multiple orthogonal readouts; replicated by subsequent studies\",\n      \"pmids\": [\"16520334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Dlg1 (DLG1) forms separate complexes with Mpp3 and Mpp4 in vivo at the outer plexiform layer, indicating distinct scaffolding functions for each MPP protein at the photoreceptor synapse.\",\n      \"method\": \"Co-immunoprecipitation from mouse retina, immunofluorescence colocalization\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — reciprocal co-IP from native tissue; single lab\",\n      \"pmids\": [\"16519681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Mpp4 organizes a presynaptic protein complex at rod photoreceptor synaptic terminals that includes plasma membrane Ca2+-ATPases (PMCAs), Veli3, and PSD95. In Mpp4 knockout mice, PMCAs are lost from rod presynaptic membranes, synaptic ribbons are enlarged (consistent with elevated Ca2+), SERCA2 is increased, and IP3RII distribution is shifted away from synaptic terminals, indicating that Mpp4 is required for Ca2+ homeostasis and modulation of synaptic transmission at rod photoreceptors.\",\n      \"method\": \"Mpp4 knockout mice, co-immunoprecipitation, immunohistochemistry, Western blot, electroretinography, electron microscopy\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — KO with multiple molecular and ultrastructural phenotypes; direct co-IP of complex members; replicated/extended by subsequent papers\",\n      \"pmids\": [\"17341488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Proteomic analysis of the MPP4-associated complex in the retina identified: (1) a selective association between MPP4 and the PSD95-beta isoform mediated by their N-terminal L27 domains; (2) recoverin and Hsc70 as novel components of the MPP4 multiprotein complex.\",\n      \"method\": \"Immunoaffinity chromatography with monoclonal anti-MPP4 antibody, 2D electrophoresis, mass spectrometry, L27 domain interaction analysis\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — immunoaffinity proteomics with MS identification; single lab but multiple proteins identified\",\n      \"pmids\": [\"18955048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MPP4 deficiency causes loss of TMEM16B (a Ca2+-dependent chloride channel) from photoreceptor membranes, and TMEM16B colocalizes with PSD95, VELI3, and MPP4 at ribbon synapses. TMEM16B contains a PDZ class I binding motif capable of interacting with PSD95 PDZ domains, suggesting it is recruited to the presynaptic complex via MPP4.\",\n      \"method\": \"Immunofluorescence colocalization, analysis of MPP4-deficient mice, PDZ binding motif analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with specific loss-of-localization phenotype; colocalization data; single lab\",\n      \"pmids\": [\"19474308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Both MPP4 and PSD95beta are essential for PMCA (plasma membrane Ca2+-ATPase) localization at the photoreceptor presynaptic membrane; MPP4 deficiency results in loss of both PMCA and PSD95 from the synapse, and C-terminal truncation of MPP4 causes loss of PSD95 and PMCA mislocalization. PSD95beta expression can rescue MPP4 and PMCA1 localization in Mpp4-mutant retinal explants.\",\n      \"method\": \"Mpp4 and Psd95 mutant mice, lentivirus-mediated molecular replacement in primary retinal explants, immunohistochemistry\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — domain truncation, KO, and molecular rescue experiment; multiple mouse models; directly establishes C-terminal domain requirement\",\n      \"pmids\": [\"19233278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRX (cone-rod homeobox) transcription factor controls expression of presynaptic proteins including MPP4 at photoreceptor presynaptic terminals; Crx-mutant retinas show aberrant MPP4 immunostaining, identifying MPP4 as a downstream CRX target gene involved in cytomatrix active zone (CAZ) establishment.\",\n      \"method\": \"Immunohistochemistry of Crx-null and Crx-mutant mouse retinas; integration of retinal transcriptomes with CRX- and NRL-ChIP-Seq data\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-Seq plus KO immunostaining establishes CRX as upstream regulator of MPP4; single lab\",\n      \"pmids\": [\"30084954\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MPP4 is a retina-specific MAGUK scaffolding protein that localizes to rod photoreceptor synaptic terminals and the outer limiting membrane, where it is recruited to the CRB1 complex via direct L27-domain-mediated interaction with MPP5/PALS1, and organizes a presynaptic protein complex containing PSD95-beta, Veli3, PMCA, and TMEM16B to regulate calcium homeostasis and synaptic transmission at rod photoreceptor ribbon synapses.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries from KEEP papers only.\n\n**Classification:**\n\nThe canonical MPP4 gene in context is the retinal MAGUK scaffolding protein (membrane palmitoylated protein 4, p55 subfamily). Papers about hematopoietic MPP4 (multipotent progenitor 4) are alias collisions. Papers about NF90/ILF3/DRBP76/TCP80 claiming identity with \"MPP4\" (M-phase phosphoprotein 4) are a different protein — alias collision. Papers about radiomics \"MPP\" (mean of positive pixels) parameters labeled MPP4 are alias collisions.\n\n- [1] KEEP — describes Mpp4 in CRB1 complex in retina\n- [2] KEEP — TMEM16B associates with MPP4 at photoreceptor ribbon synapse\n- [3] EXCLUDE — alias collision (syndecan-1/miR-10b paper, MPP4 mentioned incidentally as downregulated gene)\n- [4] EXCLUDE — alias collision (DRBP76/NF90/ILF3, different protein)\n- [5] EXCLUDE — alias collision (hematopoietic MPP4, multipotent progenitor)\n- [6] KEEP — describes MPP4 MAGUK family member identification\n- [7] EXCLUDE — alias collision (TCP80/NF90, different protein)\n- [8] EXCLUDE — alias collision (ILF3/NF90/MPP4 as M-phase phosphoprotein, different protein)\n- [9] KEEP — MPP5 recruits MPP4 to CRB1 complex\n- [10] KEEP — Mpp4 recruits Psd95 and Veli3 to photoreceptor synapse\n- [11] EXCLUDE — alias collision (hematopoietic MPP4)\n- [12] EXCLUDE — MPP4 mentioned only as genomic locus context, no mechanistic findings\n- [13] KEEP — MPP4 and MPP5 localization and Veli interaction in retina\n- [14] KEEP — Mpp4 required for PMCA localization and Ca2+ homeostasis\n- [15] EXCLUDE — alias collision (TCP80/NF90)\n- [16] KEEP — MPP3 recruited to MPP5 scaffold; Mpp4/Dlg1 complexes described\n- [17] EXCLUDE — alias collision (radiomics MPP4 parameter)\n- [18] EXCLUDE — alias collision (hematopoietic MPP4)\n- [19] EXCLUDE — alias collision (hematopoietic MPP4)\n- [20] EXCLUDE — alias collision (radiomics MPP4)\n- [21] EXCLUDE — expression study, MPP4 mentioned incidentally\n- [22] EXCLUDE — methylation/epigenetics study, no mechanistic findings about retinal MPP4\n- [23] KEEP — original cloning and characterization of MPP4 as MAGUK\n- [24] KEEP — CRX controls presynaptic active zone; MPP4 expression validated in Crx mutants\n- [25] KEEP — MPP4 protein localization in mammalian retina\n- [26] KEEP — PSD95beta regulates PMCA localization; MPP4 role defined\n- [27] EXCLUDE — alias collision (TCP80/ILF3 cell cycle)\n- [28] KEEP — proteomic analysis of MPP4-associated complex in retina\n- [29] EXCLUDE — expression study (gene upregulated in oxidative stress)\n- [30] KEEP — characterization of MPP4, expression in photoreceptors\n- [31] EXCLUDE — alias collision (hematopoietic MPP4)\n- [32] KEEP — developmental/tissue expression of Mpp4; localization at rod synaptic terminals\n- [33] EXCLUDE — alias collision (hematopoietic MPP4)\n- [34] EXCLUDE — alias collision (hematopoietic MPP4)\n- [35] EXCLUDE — alias collision (hematopoietic MPP4)\n- [36] EXCLUDE — symbol collision (Trichoderma reesei, plant/fungal system)\n- [37] EXCLUDE — alias collision (MPP11-derived peptide named MPP-4, different protein)\n- [38] KEEP — proteomic analysis of MPP4-associated protein complex\n- [39] EXCLUDE — alias collision (hematopoietic MPP4)\n- [40] EXCLUDE — alias collision (hematopoietic MPP4)\n- [41] EXCLUDE — alias collision (hematopoietic MPP4)\n- [42] EXCLUDE — alias collision (hematopoietic MPP4)\n- [43] EXCLUDE — alias collision (hematopoietic MPP4)\n- [44] EXCLUDE — alias collision (hematopoietic MPP4)\n- [45] EXCLUDE — alias collision (hematopoietic MPP4)\n- [46] EXCLUDE — alias collision (hematopoietic MPP4)\n- [47] EXCLUDE — alias collision (hematopoietic MPP4)\n\n**Additional curated papers:**\n- [1] EXCLUDE — large phosphoproteomics screen, no specific MPP4 mechanism\n- [2] EXCLUDE — large interactome screen, no specific MPP4 mechanism extracted\n- [3] EXCLUDE — mRNA interactome, no specific MPP4 mechanism\n- [4] EXCLUDE — large Y2H screen\n- [5] EXCLUDE — cDNA collection\n- [6] EXCLUDE — phosphoproteomics\n- [7] EXCLUDE — phosphoproteomics\n- [8] EXCLUDE — BioPlex interactome screen\n- [9] EXCLUDE — BioPlex 2.0\n- [10] EXCLUDE — quantitative interactome\n- [11] EXCLUDE — HuRI interactome\n- [12] EXCLUDE — cDNA sequencing\n- [13] EXCLUDE — nucleolar proteomics\n- [14] EXCLUDE — HuRI\n- [15] EXCLUDE — m6A methylation\n- [16] EXCLUDE — cDNA sequencing\n- [17] EXCLUDE — BioPlex 3.0\n- [18] EXCLUDE — protein complexes census\n- [19] EXCLUDE — GO annotation\n- [20] EXCLUDE — BioID proximity mapping (NF90/ILF3 context, alias collision)\n- [21] EXCLUDE — splicing/RBM39\n- [22] EXCLUDE — NF90/NF110 circRNA (alias collision)\n- [23] EXCLUDE — dsRNA binding domain (staufen/Xlrbpa, not MPP4 retinal)\n- [24] EXCLUDE — cDNA collection\n- [25] EXCLUDE — OpenCell (large-scale localization)\n- [26] EXCLUDE — TDP-43 interactome\n- [27] EXCLUDE — chromosome segregation complexes\n- [28] EXCLUDE — tetraspanin interactome\n- [29] EXCLUDE — metazoan complexes\n- [30] EXCLUDE — IFIT1 antiviral\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"MPP4 was cloned as a retina-specific member of the p55 subfamily of MAGUK proteins, encoding a 637 amino acid protein with PDZ, SH3, and guanylate kinase-like (GUK) domains. High expression was demonstrated specifically in human retinal tissue, and genomic co-localization with the RP26 locus on chromosome 2q31-33 was identified, implicating MPP4 as a candidate gene for inherited retinopathy.\",\n      \"method\": \"EST expression profiling, cDNA cloning, sequence alignment, RT-PCR\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — original cloning with sequence characterization and expression validation; single study\",\n      \"pmids\": [\"11414766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MPP4 protein localizes to the connecting cilia and synaptic terminals of cone and rod photoreceptors in bovine and porcine retinas, as well as postsynaptic structures in the outer plexiform layer and three bands in the inner plexiform layer, suggesting roles at membrane-cytoskeleton interfaces in distinct photoreceptor compartments.\",\n      \"method\": \"Immunofluorescence microscopy using affinity-purified anti-MPP4 antibodies on retinal sections; Western blot of retinal extracts and transfected cells\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by immunofluorescence with specific antibodies; single lab\",\n      \"pmids\": [\"14638699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Mouse Mpp4 is expressed postnatally (not embryonically) in retina, exclusively in photoreceptor cells including pineal gland, and Mpp4 protein localizes specifically at rod (but not cone) photoreceptor synaptic terminals, suggesting a role in targeting and assembly of specific molecules such as calcium channels at rod synapses.\",\n      \"method\": \"Microarray, real-time RT-PCR, in situ hybridization, immunofluorescence on retinal sections from wild-type and cone-specific GFP transgenic mice\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods confirming localization; single lab\",\n      \"pmids\": [\"12859944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MPP4 contains an L27 domain (in addition to PDZ, SH3, and GUK domains) involved in protein-protein interactions, and a retina-specific isoform lacking 71 amino acids including the L27 domain was identified. MPP4 expression was confirmed to be highest in retina and also present in brain, with in situ hybridization localizing expression to photoreceptor cells.\",\n      \"method\": \"RT-PCR, RNA in situ hybridization, mutation analysis of MPP4 ORF in RP26 family and 300 RP patients\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain characterization and isoform identification with functional context; single lab\",\n      \"pmids\": [\"12384283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MPP4 is a novel member of the CRB1-associated protein scaffold in the retina, colocalizing with CRB1 and MPP5 (PALS1) at the outer limiting membrane (OLM). MPP5 associates with both Mupp1 and Mpp4 at the sub-apical region adjacent to adherens junctions in photoreceptors.\",\n      \"method\": \"Immunohistochemistry, confocal microscopy on Crb1-/- mouse retinas; co-immunoprecipitation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP and co-localization in mouse retina; single study\",\n      \"pmids\": [\"15316081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MPP4 directly interacts with MPP5 (PALS1) to be recruited into the CRB1 protein scaffold at the outer limiting membrane. 3D homology modeling provided evidence for a mechanism regulating homo- and heterodimer formation of MPP4 and MPP5 via their L27 domains. Yeast two-hybrid screening, GST pull-down, and immunoprecipitation validated MPP4-MPP5 direct interaction, and immunoelectron microscopy confirmed co-localization at the OLM.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, immunoprecipitation, immunohistochemistry, immunoelectron microscopy, 3D homology modeling\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (Y2H, GST pulldown, Co-IP, structural modeling, immunoEM); single lab but strong methods\",\n      \"pmids\": [\"15914641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MPP4 localizes specifically to the synaptic terminals of photoreceptors (outer plexiform layer), distinct from MPP5 which localizes to apical OLM junctions. MPP4 directly interacts with Veli proteins (Veli1, Veli2, Veli3) via L27 heterodimerization in vitro. Veli3 co-localizes with MPP4 at photoreceptor synaptic terminals, suggesting MPP4 recruits Veli3 and its binding partners to this specialized region.\",\n      \"method\": \"In vitro L27 heterodimerization assay, immunofluorescence microscopy with specific polyclonal and monoclonal antibodies, co-localization studies in mouse retina\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro binding assay plus immunolocalization in native tissue; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"15558731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Mpp4 knockout mice show that Mpp4 is essential for correct localization of Psd95 and Veli3 at the presynaptic photoreceptor membrane in the outer plexiform layer. Loss of Mpp4 leads to absence of Psd95 from presynaptic membranes of rods and cones and a significant reduction in total Psd95 protein levels, suggesting Mpp4 is involved in Psd95 turnover. Veli3 protein levels are unchanged. The Crb complex at the OLM is unaffected in Mpp4 knockouts.\",\n      \"method\": \"Mpp4 knockout mouse analysis, immunohistochemistry, Western blotting, scanning laser ophthalmology, electroretinography\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined molecular phenotypes (loss of Psd95 and Veli3 from presynaptic membrane); single lab, multiple methods\",\n      \"pmids\": [\"16520334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MPP3 and Mpp4 both co-localize with DLG1 at the outer plexiform layer, and mouse Dlg1 forms separate complexes with Mpp3 and Mpp4 in vivo, identifying two distinct MAGUK scaffolding complexes at the photoreceptor synapse.\",\n      \"method\": \"Co-immunoprecipitation from mouse retina, immunohistochemistry, confocal microscopy\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — co-IP from native tissue plus localization; single lab\",\n      \"pmids\": [\"16519681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Mpp4 is required for correct localization of plasma membrane Ca2+-ATPases (PMCAs) at rod photoreceptor synaptic terminals. In Mpp4-deficient mice, PMCAs are lost from presynaptic membranes; synaptic ribbons are enlarged (correlated with elevated Ca2+); SERCA2 levels increase and IP3RII distribution shifts away from synaptic terminals as compensatory responses. Mpp4 organizes a presynaptic complex including PMCAs, Veli3, and PSD95 that modulates Ca2+ homeostasis and synaptic transmission.\",\n      \"method\": \"Mpp4 knockout mouse analysis, immunohistochemistry, Western blotting, electroretinography, electron microscopy of synaptic ribbons, co-immunoprecipitation\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple defined molecular and ultrastructural phenotypes, co-IP validation; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"17341488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Proteomic analysis of the MPP4-associated complex in mouse retina by immunoaffinity chromatography, 2D electrophoresis, and mass spectrometry identified Veli3, PSD95-beta (via L27 domain interaction), recoverin, and Hsc70 as components. The interaction of MPP4 specifically with the PSD95-beta isoform (not alpha) is mediated by their N-terminal L27 domains.\",\n      \"method\": \"Immunoaffinity chromatography with monoclonal anti-MPP4 antibody, 2D-PAGE, mass spectrometry, co-immunoprecipitation, L27 domain interaction assays\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — unbiased proteomics plus targeted co-IP and domain mapping; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"18955048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TMEM16B, a Ca2+-dependent chloride channel, co-localizes with MPP4, PSD95, and VELI3 at photoreceptor ribbon synapses and is lost from photoreceptor membranes in MPP4-deficient mice, demonstrating that TMEM16B is recruited to photoreceptor presynaptic membranes via the MPP4-containing protein complex.\",\n      \"method\": \"Immunofluorescence co-localization in mouse retina, MPP4-knockout mouse analysis, Western blotting, electrophysiology (patch-clamp and halide-sensitive fluorescent protein assays for channel activity)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse showing loss of TMEM16B from membranes, co-localization, and functional channel characterization; single lab, multiple methods\",\n      \"pmids\": [\"19474308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Both MPP4 and PSD95beta are essential for correct localization of PMCA at the photoreceptor presynaptic plasma membrane. C-terminal truncation of MPP4 causes loss of PSD95 and PMCA mislocalization. Silencing of Psd95 results in loss of presynaptic MPP4 and PMCA1, and expression of PSD95beta (but not alpha) via lentiviral delivery restores PMCA1 and MPP4 plasma membrane localization in Mpp4 mutant retinal explants, demonstrating isoform-specific interdependence.\",\n      \"method\": \"Mpp4 and Psd95 mutant mouse analysis, lentivirus-mediated molecular replacement in primary retinal explants, immunofluorescence, Western blotting\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — rescue experiment with isoform-specific replacement plus KO phenotype; single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"19233278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRX (cone-rod homeobox) transcription factor controls expression of MPP4 in photoreceptors, as validated by aberrant/reduced MPP4 immunostaining in Crx-null and dominant Crx-mutant retinas, placing MPP4 downstream of CRX in the regulatory pathway governing presynaptic active zone organization.\",\n      \"method\": \"Immunohistochemistry in Crx-/-, CrxRip/+ and CrxRip/Rip mouse retinas; integration with CRX- and NRL-ChIP-Seq data; transcriptome analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — IHC validation combined with ChIP-seq; single lab\",\n      \"pmids\": [\"30084954\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MPP4 is a retina-specific MAGUK scaffolding protein of the p55 subfamily that localizes to photoreceptor synaptic terminals (outer plexiform layer) and the outer limiting membrane, where it is recruited into the CRB1 complex via direct L27-domain-mediated interaction with MPP5/PALS1, and in turn organizes a presynaptic scaffold by recruiting PSD95-beta (via L27 heterodimerization), Veli3 (via L27 heterodimerization), plasma membrane Ca2+-ATPases (PMCAs), and TMEM16B, thereby modulating presynaptic Ca2+ homeostasis and synaptic transmission in rod photoreceptors.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MPP4 is a retina-specific MAGUK scaffolding protein that organizes presynaptic multiprotein complexes at rod photoreceptor ribbon synapses to maintain calcium homeostasis and synaptic transmission. MPP4 contains PDZ, SH3, guanylate kinase-like, and L27 domains; the L27 domain mediates direct interactions with MPP5/PALS1, recruiting MPP4 into the CRB1 complex at the outer limiting membrane, and with PSD95-beta and Veli3 at synaptic terminals [PMID:15914641, PMID:15558731, PMID:18955048]. In Mpp4 knockout mice, PSD95, plasma membrane Ca²⁺-ATPases (PMCAs), Veli3, and the Ca²⁺-dependent chloride channel TMEM16B are lost from rod presynaptic membranes, resulting in enlarged synaptic ribbons indicative of elevated intracellular Ca²⁺ and disrupted synaptic signaling [PMID:16520334, PMID:17341488, PMID:19474308]. MPP4 expression is transcriptionally controlled by the photoreceptor-specific transcription factor CRX, linking it to the broader program of photoreceptor synaptogenesis [PMID:30084954].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identifying MPP4 as a retina-specific member of the p55/MAGUK scaffold family established that photoreceptors employ a dedicated PDZ/SH3/GUK-domain protein for membrane-associated complex organization.\",\n      \"evidence\": \"Full-length cDNA cloning and domain analysis from retinal cDNA library\",\n      \"pmids\": [\"11414766\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No interaction partners or in vivo function established\", \"Expression restricted to retina but precise cell type unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Subcellular localization studies resolved where MPP4 functions, placing it at photoreceptor synaptic terminals (predominantly rods) and connecting cilia — two structurally and functionally distinct membrane domains.\",\n      \"evidence\": \"Immunofluorescence on bovine, porcine, and mouse retinal sections with affinity-purified antibodies; in situ hybridization and microarray profiling in mouse\",\n      \"pmids\": [\"14638699\", \"12859944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of selective targeting to these compartments unknown\", \"Whether MPP4 is present in cones was initially contradictory between species\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Discovering MPP4's association with the CRB1/MUPP1/PALS1 complex at the outer limiting membrane revealed its participation in apical polarity scaffolding, a system linked to retinal dystrophies.\",\n      \"evidence\": \"Co-immunoprecipitation and immunolocalization in mouse retina\",\n      \"pmids\": [\"15316081\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding partner within the complex not yet mapped\", \"Functional consequence of MPP4 loss for OLM integrity not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Mapping L27-domain-mediated direct interactions with MPP5/PALS1 and Veli proteins established the modular basis by which MPP4 is recruited to the CRB1 complex at the OLM and assembles a separate Veli3-containing complex at the synapse.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunoelectron microscopy, 3D homology modeling, and in vitro L27 heterodimerization assays\",\n      \"pmids\": [\"15914641\", \"15558731\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether L27-mediated interactions are regulated dynamically in vivo unknown\", \"Stoichiometry of the synaptic versus OLM complexes not determined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mpp4 knockout mice demonstrated that MPP4 is essential for anchoring PSD95 and Veli3 at rod and cone presynaptic membranes, establishing its non-redundant scaffolding role in vivo and showing that separate DLG1–MPP4 and DLG1–MPP3 complexes exist at the OPL.\",\n      \"evidence\": \"Mpp4 knockout mouse with immunohistochemistry, Western blot, electroretinography; reciprocal co-IP from mouse retina\",\n      \"pmids\": [\"16520334\", \"16519681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Electrophysiological consequence at the single-cell level not characterized\", \"Whether MPP4 loss affects OLM integrity not assessed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extending the KO analysis to calcium-handling proteins revealed that MPP4 is required for PMCA retention at the presynaptic membrane and for normal calcium homeostasis, as Mpp4-null rods exhibit enlarged ribbons and redistributed IP3RII — linking scaffolding to ion channel physiology.\",\n      \"evidence\": \"Mpp4 knockout mice analyzed by co-immunoprecipitation, immunohistochemistry, electron microscopy, and electroretinography\",\n      \"pmids\": [\"17341488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct calcium measurements in knockout terminals not performed\", \"Whether PMCA binds MPP4 directly or via PSD95 not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Proteomic dissection of the MPP4 interactome identified PSD95-beta (not PSD95-alpha) as the specific isoform recruited via L27 domains, and added recoverin and Hsc70 as novel complex components, refining the molecular composition of the presynaptic scaffold.\",\n      \"evidence\": \"Immunoaffinity chromatography with monoclonal anti-MPP4, 2D electrophoresis, and mass spectrometry\",\n      \"pmids\": [\"18955048\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional roles of recoverin and Hsc70 within the MPP4 complex not tested\", \"Single proteomic study; independent validation of all hits not performed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Molecular rescue and domain-truncation experiments showed that the MPP4 C-terminus is required for PSD95 retention and that PSD95-beta expression can restore PMCA1 localization in Mpp4-mutant retinas, establishing a hierarchical assembly mechanism; separately, TMEM16B was identified as a downstream effector whose synaptic localization depends on the MPP4 complex.\",\n      \"evidence\": \"Mpp4 and Psd95 mutant mice, lentivirus-mediated rescue in retinal explants, immunohistochemistry; analysis of MPP4-deficient mice for TMEM16B localization\",\n      \"pmids\": [\"19233278\", \"19474308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TMEM16B binds PSD95 directly in vivo not confirmed by co-IP\", \"Electrophysiological recording of chloride currents in Mpp4 KO not performed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of CRX as an upstream transcriptional regulator of MPP4 connected the presynaptic scaffold to the gene-regulatory network governing photoreceptor synaptogenesis.\",\n      \"evidence\": \"Immunohistochemistry of Crx-null/mutant mouse retinas integrated with CRX- and NRL-ChIP-Seq data\",\n      \"pmids\": [\"30084954\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CRX directly binds the Mpp4 promoter or acts indirectly not definitively resolved\", \"Other transcription factors regulating Mpp4 not characterized\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include whether MPP4 loss contributes to human retinal disease, the precise stoichiometry and structural architecture of the MPP4 presynaptic complex, and the functional role of MPP4 at the OLM versus the synapse.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No human disease mutations in MPP4 reported\", \"No high-resolution structural data for the MPP4 complex\", \"Relative functional importance of OLM versus synaptic pools not dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 5, 6, 8, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 2, 6, 8, 11]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [6, 8, 10, 11]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [6, 8, 11]}\n    ],\n    \"complexes\": [\n      \"CRB1/MPP5/MUPP1 complex\",\n      \"MPP4-PSD95beta-Veli3-PMCA presynaptic complex\"\n    ],\n    \"partners\": [\n      \"MPP5\",\n      \"LIN7C\",\n      \"DLG4\",\n      \"DLG1\",\n      \"CRB1\",\n      \"ATP2B1\",\n      \"ANO2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"MPP4 is a retina-specific MAGUK scaffolding protein that organizes presynaptic protein complexes at rod photoreceptor ribbon synapses, thereby regulating calcium homeostasis and synaptic transmission. It contains PDZ, SH3, guanylate kinase-like (GUK), and L27 domains; the L27 domain mediates heterodimerization with MPP5/PALS1 (recruiting MPP4 into the CRB1 complex at the outer limiting membrane), with PSD95-beta (isoform-specific), and with Veli3, assembling a scaffold that anchors plasma membrane Ca²⁺-ATPases (PMCAs) and the Ca²⁺-dependent chloride channel TMEM16B at the presynaptic membrane [PMID:15914641, PMID:18955048, PMID:19474308]. Mpp4-knockout mice lose PMCA, PSD95, and TMEM16B from rod synaptic terminals, develop enlarged synaptic ribbons indicative of elevated presynaptic Ca²⁺, and show compensatory upregulation of SERCA2, establishing MPP4 as essential for presynaptic Ca²⁺ extrusion and ion channel localization [PMID:17341488, PMID:16520334, PMID:19233278]. MPP4 expression is controlled by the photoreceptor transcription factor CRX, placing it within the CRX-dependent gene regulatory network for synaptogenesis [PMID:30084954].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of MPP4 as a novel retina-enriched MAGUK established that a previously uncharacterized p55-subfamily member might function specifically in photoreceptor biology and could underlie RP26-linked retinopathy.\",\n      \"evidence\": \"cDNA cloning, EST profiling, RT-PCR, and chromosomal mapping in human retina\",\n      \"pmids\": [\"11414766\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No pathogenic mutations found in RP26 patients\", \"Functional role unknown\", \"Protein-level localization not determined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Localization studies resolved where MPP4 acts, placing it at photoreceptor synaptic terminals (outer plexiform layer) and connecting cilia, with rod-specific expression emerging postnatally in mouse — narrowing its function to postnatal synaptic organization rather than photoreceptor development.\",\n      \"evidence\": \"Immunofluorescence on bovine, porcine, and mouse retinal sections; in situ hybridization; microarray and RT-PCR\",\n      \"pmids\": [\"14638699\", \"12859944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding partners at the synapse unknown\", \"Discrepancy between species on cone vs. rod expression\", \"Functional consequence of synaptic localization not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Biochemical studies answered how MPP4 is integrated into retinal scaffolds: L27-domain-mediated direct interaction with MPP5/PALS1 recruits MPP4 into the CRB1 complex at the OLM, while L27 heterodimerization with Veli3 positions MPP4 as an organizer of a distinct presynaptic complex.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunoelectron microscopy, and 3D homology modeling in retina and in vitro\",\n      \"pmids\": [\"15914641\", \"15558731\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MPP4's OLM role is functionally important vs. dispensable was untested\", \"No loss-of-function data yet\", \"Full composition of the presynaptic complex unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Generation of Mpp4-knockout mice demonstrated that MPP4 is essential for anchoring PSD95 and Veli3 at rod presynaptic membranes, while the CRB1 complex at the OLM is unaffected — resolving that MPP4's primary non-redundant function is synaptic, not junctional.\",\n      \"evidence\": \"Mpp4 knockout mouse: immunohistochemistry, Western blotting, electroretinography, scanning laser ophthalmoscopy\",\n      \"pmids\": [\"16520334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which loss of MPP4 destabilizes PSD95 (degradation vs. mistargeting) not resolved\", \"Whether synaptic transmission is functionally impaired remained unclear\", \"Interaction with DLG1 identified but functional significance unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Analysis of Mpp4-null retinas revealed that MPP4 is required for PMCA localization at rod synapses and that its loss leads to Ca²⁺ dysregulation (enlarged ribbons, compensatory SERCA2 upregulation), establishing MPP4 as a master organizer of presynaptic Ca²⁺ homeostasis.\",\n      \"evidence\": \"Mpp4 knockout mouse: co-immunoprecipitation, electron microscopy of synaptic ribbons, immunohistochemistry, Western blot, ERG\",\n      \"pmids\": [\"17341488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction between MPP4 and PMCA not demonstrated\", \"Quantitative Ca²⁺ measurements not performed\", \"Whether cone synapses are affected unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Unbiased proteomic characterization of the MPP4-associated complex identified PSD95-beta (not alpha) as the specific isoform recruited via L27 domain interaction, along with recoverin and Hsc70, refining the molecular architecture of the presynaptic scaffold.\",\n      \"evidence\": \"Immunoaffinity chromatography with anti-MPP4 antibody, 2D-PAGE, mass spectrometry, co-IP, and L27 domain mapping from mouse retina\",\n      \"pmids\": [\"18955048\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional roles of recoverin and Hsc70 within the complex unknown\", \"Stoichiometry and structural arrangement not determined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Two studies resolved the functional interdependence within the MPP4 scaffold: TMEM16B (a Ca²⁺-dependent Cl⁻ channel) is lost from photoreceptor membranes in Mpp4-null mice, and isoform-specific rescue with PSD95-beta restores both MPP4 and PMCA1 membrane localization, demonstrating that MPP4 and PSD95-beta cooperatively anchor ion-regulatory proteins at the presynaptic membrane.\",\n      \"evidence\": \"Mpp4 and Psd95 mutant mice, lentiviral molecular replacement in retinal explants, patch-clamp electrophysiology, immunofluorescence, Western blotting\",\n      \"pmids\": [\"19474308\", \"19233278\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TMEM16B directly binds MPP4 or is recruited indirectly unknown\", \"In vivo electrophysiological consequences for visual function not fully characterized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of CRX as a transcriptional regulator of MPP4 placed the gene within the photoreceptor-specific gene regulatory network governing synaptogenesis, linking upstream transcription factor control to presynaptic scaffold assembly.\",\n      \"evidence\": \"Immunohistochemistry in Crx-null and dominant Crx-mutant mouse retinas integrated with CRX and NRL ChIP-Seq datasets\",\n      \"pmids\": [\"30084954\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CRX directly binds the Mpp4 promoter or acts indirectly not fully resolved\", \"Other transcription factors regulating MPP4 not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include whether MPP4 mutations cause human retinal disease, the atomic-resolution structure of the MPP4 presynaptic scaffold, the direct vs. indirect nature of MPP4-PMCA and MPP4-TMEM16B interactions, and the precise electrophysiological impact of MPP4 loss on rod synaptic transmission in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No causative MPP4 mutations identified in human retinal dystrophy patients\", \"No crystal or cryo-EM structure of the MPP4-containing complex\", \"In vivo single-cell recordings from Mpp4-null rods not performed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 6, 7, 9, 10, 11, 12]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [7, 9, 11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 2, 6, 7, 9, 11, 12]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [7, 9, 11, 12]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [7, 9, 11, 12]}\n    ],\n    \"complexes\": [\n      \"CRB1 apical complex (at OLM)\",\n      \"MPP4-PSD95beta-Veli3 presynaptic scaffold\"\n    ],\n    \"partners\": [\n      \"MPP5\",\n      \"DLG4\",\n      \"VELI3\",\n      \"PMCA\",\n      \"ANO2\",\n      \"DLG1\",\n      \"CRB1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}