{"gene":"BORCS7","run_date":"2026-06-09T22:02:45","timeline":{"discoveries":[{"year":2018,"finding":"A spontaneous truncation mutation in mouse Borcs7 causes progressive axonal dystrophy and severe motor impairment; complete deletion of Borcs7 coding sequence is lethal shortly after birth, and neurons from Borcs7-null animals show impaired centrifugal (anterograde) lysosome transport, establishing BORCS7 as a central factor in axonal lysosome transport.","method":"Whole-genome sequencing to identify mutation, genetic complementation, homozygous knockout mouse generation, live-cell imaging of lysosome transport in cultured neurons, behavioral motor assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (genetic identification, complementation, KO, neuronal transport assay, behavioral phenotype) in a single rigorous study with clear loss-of-function readouts","pmids":["30067980"],"is_preprint":false},{"year":2016,"finding":"BORCS7 is a subunit of the BLOC-one-related complex (BORC), which is required for spatial positioning/distribution of lysosomes within the cytoplasm; risk alleles at the 10q24.32 schizophrenia locus are associated with selectively increased BORCS7 expression in human brain, and BORCS7 is expressed in adult human neurons and astrocytes and upregulated during neuronal differentiation from stem cells.","method":"Conditional expression analysis of GWAS risk SNPs, immunohistochemistry/in situ expression in human brain tissue, human stem cell neuronal differentiation assays","journal":"Nature medicine","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — expression and eQTL analyses in multiple datasets establish brain-specific upregulation and neuronal expression; complex membership inferred from prior BORC literature rather than direct biochemical reconstitution in this paper","pmids":["27158905"],"is_preprint":false},{"year":2017,"finding":"BORC complex subunits (including BORCS7) interact with the actin and microtubule cytoskeleton, membrane tethers, and SNAREs to control endosomal membrane movement by motors and targeting of membrane proteins to specialized domains such as nerve terminals and primary cilia.","method":"Review/synthesis of Co-IP and interaction data from multiple studies cited within the review","journal":"Developmental neurobiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — review paper synthesizing prior interaction data; no direct new experiment on BORCS7 specifically reported in this abstract","pmids":["28986965"],"is_preprint":false},{"year":2018,"finding":"BORC (BLOC-one-related complex) tethers lysosomes to the kinesin microtubule motor for lysosome positioning; BORCS7 is a subunit required for this tethering function, as demonstrated by the Borcs7 mutant mouse showing impaired lysosome transport.","method":"Commentary/synthesis based on Snouwaert et al. Cell Reports data (lysosome transport assays, motor behavior)","journal":"Trends in cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic model supported by the primary Cell Reports paper; this is a commentary confirming the kinesin-tethering role of BORC/BORCS7 based on the experimental data in PMID 30067980","pmids":["30185380"],"is_preprint":false},{"year":2020,"finding":"Knockdown of borcs7 in zebrafish larvae did not alter blood pressure-related parameters (blood flow, arterial pulse, linear velocity), indicating BORCS7 is not the causal gene at the 10q24.32 blood pressure locus in this model.","method":"Morpholino splice-modification knockdown in zebrafish larvae with blood flow measurement","journal":"Frontiers in cardiovascular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct loss-of-function in vivo experiment with quantitative readout; negative result for blood pressure function specifically","pmids":["32984406"],"is_preprint":false},{"year":2024,"finding":"Overexpression of Borcs7 in the mouse medial prefrontal cortex (mPFC) produced schizophrenia-like behaviors including abnormal prepulse inhibition and social dysfunction, placing BORCS7 as a functional contributor to prefrontal circuit function relevant to psychiatric disease.","method":"CRISPR/Cas9-mediated genome deletion, luciferase reporter assays, RT-qPCR, and Borcs7 overexpression in mouse mPFC with behavioral phenotyping (prepulse inhibition, social interaction tests)","journal":"Psychiatry research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct gain-of-function in vivo experiment with defined behavioral readouts; single study, single lab","pmids":["38718554"],"is_preprint":false},{"year":2020,"finding":"BORCS7 protein levels were identified as differentially expressed in HCMV-infected cells lacking pUL138, and BORCS7 knockdown was demonstrated to affect HCMV infection efficiency, indicating BORCS7 participates in a host pathway exploited during viral infection.","method":"Comparative quantitative proteomics (TMT-based) of HCMV-infected vs. UL138-deletion mutant-infected cells; functional knockdown validation of BORCS7 effect on HCMV infection","journal":"Molecules (Basel, Switzerland)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, proteomics screen plus partial knockdown validation; no mechanistic pathway placement for BORCS7 specifically","pmids":["32481657"],"is_preprint":false}],"current_model":"BORCS7 is a subunit of the BLOC-one-related complex (BORC) that tethers lysosomes to kinesin motors on microtubules to drive centrifugal (anterograde) lysosome transport in neurons; loss of BORCS7 in mice impairs axonal lysosome transport, causes progressive dystrophic axonopathy and motor deficits, and complete knockout is neonatal lethal, while overexpression in mouse prefrontal cortex produces schizophrenia-like behaviors."},"narrative":{"mechanistic_narrative":"BORCS7 is a subunit of the BLOC-one-related complex (BORC) that controls the spatial positioning of lysosomes within the cytoplasm [PMID:27158905]. BORC tethers lysosomes to the kinesin microtubule motor to drive their centrifugal (anterograde) transport, and BORCS7 is essential for this tethering function [PMID:30185380]. In mice, a truncating mutation in Borcs7 impairs anterograde lysosome transport in neurons and produces progressive axonal dystrophy with severe motor impairment, while complete deletion of the coding sequence is neonatal lethal, establishing BORCS7 as a central factor in axonal lysosome transport [PMID:30067980]. Beyond lysosome positioning, BORCS7 is genetically and functionally linked to psychiatric and disease contexts: schizophrenia risk alleles at the 10q24.32 locus are associated with selectively increased BORCS7 brain expression [PMID:27158905], and overexpression of Borcs7 in the mouse medial prefrontal cortex produces schizophrenia-like behaviors including abnormal prepulse inhibition and social dysfunction [PMID:38718554]. Direct biochemical reconstitution of the BORC complex with isolated BORCS7 has not been characterized in the available corpus.","teleology":[{"year":2016,"claim":"Established BORCS7 as a BORC subunit governing intracellular lysosome distribution and connected it to human disease genetics, addressing whether the gene has a defined cellular role and brain relevance.","evidence":"GWAS risk-SNP expression analysis, immunohistochemistry in human brain, and stem-cell neuronal differentiation assays","pmids":["27158905"],"confidence":"Medium","gaps":["Complex membership inferred from prior BORC literature rather than direct biochemical reconstitution here","No mechanistic link between increased expression and behavioral or cellular phenotype","Causal direction of the schizophrenia eQTL association not established"]},{"year":2018,"claim":"Demonstrated that BORCS7 is required in vivo for anterograde axonal lysosome transport and that its loss causes axonopathy and motor disease, answering whether the lysosome-positioning role has organismal consequences.","evidence":"Whole-genome sequencing of a spontaneous mutant, genetic complementation, knockout mouse generation, live-cell lysosome transport imaging in neurons, and behavioral motor assays","pmids":["30067980"],"confidence":"High","gaps":["Does not resolve the molecular interface by which BORCS7 couples lysosomes to kinesin","Mechanism linking impaired transport to axonal dystrophy not detailed","Cause of neonatal lethality in full knockouts not defined"]},{"year":2018,"claim":"Consolidated the model that BORC, via BORCS7, tethers lysosomes to kinesin for centrifugal positioning, framing the mechanistic interpretation of the mutant phenotype.","evidence":"Commentary synthesizing the primary Cell Reports lysosome-transport and motor-behavior data","pmids":["30185380"],"confidence":"Medium","gaps":["Does not provide new experimental evidence","Identity of the kinesin and adaptor interactions for BORCS7 not directly tested"]},{"year":2020,"claim":"Tested and excluded BORCS7 as the causal gene at the 10q24.32 blood pressure locus, clarifying which colocalized trait the gene does not drive.","evidence":"Morpholino splice-modification knockdown in zebrafish larvae with blood flow and arterial pulse measurements","pmids":["32984406"],"confidence":"Medium","gaps":["Negative result limited to blood pressure parameters in larval zebrafish","Does not address neuronal or lysosomal phenotypes in this model"]},{"year":2020,"claim":"Implicated BORCS7 in a host pathway exploited during viral infection, raising a non-neuronal functional context.","evidence":"TMT-based comparative proteomics of HCMV-infected versus UL138-deletion mutant cells with knockdown validation of infection efficiency","pmids":["32481657"],"confidence":"Low","gaps":["Single lab screen with partial knockdown validation; no mechanistic pathway placement for BORCS7","Connection to lysosomal trafficking role not established"]},{"year":2024,"claim":"Showed that elevated BORCS7 dosage in prefrontal cortex is sufficient to produce schizophrenia-like behavior, linking the disease-associated expression increase to a causal circuit phenotype.","evidence":"Borcs7 overexpression in mouse mPFC with prepulse inhibition and social interaction phenotyping, supported by CRISPR deletion, luciferase reporter, and RT-qPCR","pmids":["38718554"],"confidence":"Medium","gaps":["Single study, single lab","Cellular mechanism linking BORCS7 overexpression to circuit dysfunction not defined","Relationship between behavioral effect and lysosome transport unknown"]},{"year":null,"claim":"How BORCS7 molecularly couples lysosomes to kinesin and how its dosage perturbs prefrontal circuits remains unresolved.","evidence":"No direct reconstitution or structural characterization of BORCS7 within BORC, nor a mechanistic link between transport and behavior, is present in the corpus","pmids":[],"confidence":"Low","gaps":["No biochemical reconstitution of BORCS7 in the BORC complex","Direct physical partners of BORCS7 not individually mapped","Mechanistic bridge between lysosome transport and schizophrenia-like behavior absent"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,1,3]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,3]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,3]}],"complexes":["BORC (BLOC-one-related complex)"],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96B45","full_name":"BLOC-1-related complex subunit 7","aliases":["Diaskedin"],"length_aa":106,"mass_kda":11.7,"function":"As part of the BORC complex may play a role in lysosomes movement and localization at the cell periphery. Associated with the cytosolic face of lysosomes, the BORC complex may recruit ARL8B and couple lysosomes to microtubule plus-end-directed kinesin motor","subcellular_location":"Lysosome membrane","url":"https://www.uniprot.org/uniprotkb/Q96B45/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BORCS7","classification":"Not Classified","n_dependent_lines":24,"n_total_lines":1208,"dependency_fraction":0.019867549668874173},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/BORCS7","total_profiled":1310},"omim":[{"mim_id":"616601","title":"BLOC1-RELATED COMPLEX, SUBUNIT 8; BORCS8","url":"https://www.omim.org/entry/616601"},{"mim_id":"616600","title":"BLOC1-RELATED COMPLEX, SUBUNIT 7; BORCS7","url":"https://www.omim.org/entry/616600"},{"mim_id":"616599","title":"BLOC1-RELATED COMPLEX, SUBUNIT 6; BORCS6","url":"https://www.omim.org/entry/616599"},{"mim_id":"616598","title":"BLOC1-RELATED COMPLEX, SUBUNIT 5; BORCS5","url":"https://www.omim.org/entry/616598"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/BORCS7"},"hgnc":{"alias_symbol":["FLJ40752"],"prev_symbol":["C10orf32"]},"alphafold":{"accession":"Q96B45","domains":[{"cath_id":"1.20.5","chopping":"20-104","consensus_level":"medium","plddt":97.4133,"start":20,"end":104}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96B45","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96B45-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96B45-F1-predicted_aligned_error_v6.png","plddt_mean":94.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BORCS7","jax_strain_url":"https://www.jax.org/strain/search?query=BORCS7"},"sequence":{"accession":"Q96B45","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96B45.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96B45/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96B45"}},"corpus_meta":[{"pmid":"22383894","id":"PMC_22383894","title":"Genome-wide association study identifies chromosome 10q24.32 variants associated with arsenic metabolism and toxicity phenotypes in Bangladesh.","date":"2012","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22383894","citation_count":145,"is_preprint":false},{"pmid":"27158905","id":"PMC_27158905","title":"A human-specific AS3MT isoform and BORCS7 are molecular risk factors in the 10q24.32 schizophrenia-associated locus.","date":"2016","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/27158905","citation_count":131,"is_preprint":false},{"pmid":"30067980","id":"PMC_30067980","title":"A Mutation in the Borcs7 Subunit of the Lysosome Regulatory BORC Complex Results in Motor Deficits and Dystrophic Axonopathy in Mice.","date":"2018","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/30067980","citation_count":42,"is_preprint":false},{"pmid":"27004590","id":"PMC_27004590","title":"Genome-wide significant schizophrenia risk variation on chromosome 10q24 is associated with altered cis-regulation of BORCS7, AS3MT, and NT5C2 in the human brain.","date":"2016","source":"American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/27004590","citation_count":40,"is_preprint":false},{"pmid":"32779937","id":"PMC_32779937","title":"Arsenic Metabolism in Mice Carrying a BORCS7/AS3MT Locus Humanized by Syntenic Replacement.","date":"2020","source":"Environmental health perspectives","url":"https://pubmed.ncbi.nlm.nih.gov/32779937","citation_count":36,"is_preprint":false},{"pmid":"28348047","id":"PMC_28348047","title":"Genome-Wide Association Study Meta-Analysis of Long-Term Average Blood Pressure in East Asians.","date":"2017","source":"Circulation. Cardiovascular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28348047","citation_count":26,"is_preprint":false},{"pmid":"28986965","id":"PMC_28986965","title":"Neurodevelopmental disease mechanisms, primary cilia, and endosomes converge on the BLOC-1 and BORC complexes.","date":"2017","source":"Developmental neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/28986965","citation_count":24,"is_preprint":false},{"pmid":"32984406","id":"PMC_32984406","title":"Studies in Zebrafish Demonstrate That CNNM2 and NT5C2 Are Most Likely the Causal Genes at the Blood Pressure-Associated Locus on Human Chromosome 10q24.32.","date":"2020","source":"Frontiers in cardiovascular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/32984406","citation_count":19,"is_preprint":false},{"pmid":"31386983","id":"PMC_31386983","title":"The effect of a genetic variant at the schizophrenia associated AS3MT/BORCS7 locus on striatal dopamine function: A PET imaging study.","date":"2019","source":"Psychiatry research. Neuroimaging","url":"https://pubmed.ncbi.nlm.nih.gov/31386983","citation_count":14,"is_preprint":false},{"pmid":"32433756","id":"PMC_32433756","title":"Genetic Determinants of Reduced Arsenic Metabolism Efficiency in the 10q24.32 Region Are Associated With Reduced AS3MT Expression in Multiple Human Tissue Types.","date":"2020","source":"Toxicological sciences : an official journal of the Society of Toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/32433756","citation_count":14,"is_preprint":false},{"pmid":"39117060","id":"PMC_39117060","title":"Identifying genetic determinants of sarcopenia-related traits: a Mendelian randomization study of druggable genes.","date":"2024","source":"Metabolism: clinical and experimental","url":"https://pubmed.ncbi.nlm.nih.gov/39117060","citation_count":12,"is_preprint":false},{"pmid":"32481657","id":"PMC_32481657","title":"A Comparative Quantitative Proteomic Analysis of HCMV-Infected Cells Highlights pUL138 as a Multifunctional Protein.","date":"2020","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/32481657","citation_count":11,"is_preprint":false},{"pmid":"36871058","id":"PMC_36871058","title":"Fate of arsenicals in mice carrying the human AS3MT gene exposed to environmentally relevant levels of arsenite in drinking water.","date":"2023","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/36871058","citation_count":9,"is_preprint":false},{"pmid":"32436959","id":"PMC_32436959","title":"Analysis of putative cis-regulatory elements regulating blood pressure variation.","date":"2020","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32436959","citation_count":8,"is_preprint":false},{"pmid":"40438498","id":"PMC_40438498","title":"Comprehensive genome-wide analysis of retinal vessel caliber reveals microvascular-blood pressure pathways: advancing predictive, preventive, and personalized medicine.","date":"2025","source":"The EPMA journal","url":"https://pubmed.ncbi.nlm.nih.gov/40438498","citation_count":4,"is_preprint":false},{"pmid":"30185380","id":"PMC_30185380","title":"Lysosomes nor Mice Move Forward without Borcs7.","date":"2018","source":"Trends in cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/30185380","citation_count":1,"is_preprint":false},{"pmid":"38718554","id":"PMC_38718554","title":"Genomic landscape and functional characterization of structural variations in schizophrenia and bipolar disorder.","date":"2024","source":"Psychiatry research","url":"https://pubmed.ncbi.nlm.nih.gov/38718554","citation_count":1,"is_preprint":false},{"pmid":"41501475","id":"PMC_41501475","title":"Precision nutrition for hypertension: tea, coffee, antioxidant vitamins interactions with polygenic risk in multi-ethnic populations.","date":"2026","source":"European journal of clinical nutrition","url":"https://pubmed.ncbi.nlm.nih.gov/41501475","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12085,"output_tokens":1749,"usd":0.031245,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8649,"output_tokens":2368,"usd":0.051222,"stage2_stop_reason":"end_turn"},"total_usd":0.082467,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2018,\n      \"finding\": \"A spontaneous truncation mutation in mouse Borcs7 causes progressive axonal dystrophy and severe motor impairment; complete deletion of Borcs7 coding sequence is lethal shortly after birth, and neurons from Borcs7-null animals show impaired centrifugal (anterograde) lysosome transport, establishing BORCS7 as a central factor in axonal lysosome transport.\",\n      \"method\": \"Whole-genome sequencing to identify mutation, genetic complementation, homozygous knockout mouse generation, live-cell imaging of lysosome transport in cultured neurons, behavioral motor assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (genetic identification, complementation, KO, neuronal transport assay, behavioral phenotype) in a single rigorous study with clear loss-of-function readouts\",\n      \"pmids\": [\"30067980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BORCS7 is a subunit of the BLOC-one-related complex (BORC), which is required for spatial positioning/distribution of lysosomes within the cytoplasm; risk alleles at the 10q24.32 schizophrenia locus are associated with selectively increased BORCS7 expression in human brain, and BORCS7 is expressed in adult human neurons and astrocytes and upregulated during neuronal differentiation from stem cells.\",\n      \"method\": \"Conditional expression analysis of GWAS risk SNPs, immunohistochemistry/in situ expression in human brain tissue, human stem cell neuronal differentiation assays\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — expression and eQTL analyses in multiple datasets establish brain-specific upregulation and neuronal expression; complex membership inferred from prior BORC literature rather than direct biochemical reconstitution in this paper\",\n      \"pmids\": [\"27158905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BORC complex subunits (including BORCS7) interact with the actin and microtubule cytoskeleton, membrane tethers, and SNAREs to control endosomal membrane movement by motors and targeting of membrane proteins to specialized domains such as nerve terminals and primary cilia.\",\n      \"method\": \"Review/synthesis of Co-IP and interaction data from multiple studies cited within the review\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — review paper synthesizing prior interaction data; no direct new experiment on BORCS7 specifically reported in this abstract\",\n      \"pmids\": [\"28986965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BORC (BLOC-one-related complex) tethers lysosomes to the kinesin microtubule motor for lysosome positioning; BORCS7 is a subunit required for this tethering function, as demonstrated by the Borcs7 mutant mouse showing impaired lysosome transport.\",\n      \"method\": \"Commentary/synthesis based on Snouwaert et al. Cell Reports data (lysosome transport assays, motor behavior)\",\n      \"journal\": \"Trends in cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic model supported by the primary Cell Reports paper; this is a commentary confirming the kinesin-tethering role of BORC/BORCS7 based on the experimental data in PMID 30067980\",\n      \"pmids\": [\"30185380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Knockdown of borcs7 in zebrafish larvae did not alter blood pressure-related parameters (blood flow, arterial pulse, linear velocity), indicating BORCS7 is not the causal gene at the 10q24.32 blood pressure locus in this model.\",\n      \"method\": \"Morpholino splice-modification knockdown in zebrafish larvae with blood flow measurement\",\n      \"journal\": \"Frontiers in cardiovascular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct loss-of-function in vivo experiment with quantitative readout; negative result for blood pressure function specifically\",\n      \"pmids\": [\"32984406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Overexpression of Borcs7 in the mouse medial prefrontal cortex (mPFC) produced schizophrenia-like behaviors including abnormal prepulse inhibition and social dysfunction, placing BORCS7 as a functional contributor to prefrontal circuit function relevant to psychiatric disease.\",\n      \"method\": \"CRISPR/Cas9-mediated genome deletion, luciferase reporter assays, RT-qPCR, and Borcs7 overexpression in mouse mPFC with behavioral phenotyping (prepulse inhibition, social interaction tests)\",\n      \"journal\": \"Psychiatry research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct gain-of-function in vivo experiment with defined behavioral readouts; single study, single lab\",\n      \"pmids\": [\"38718554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BORCS7 protein levels were identified as differentially expressed in HCMV-infected cells lacking pUL138, and BORCS7 knockdown was demonstrated to affect HCMV infection efficiency, indicating BORCS7 participates in a host pathway exploited during viral infection.\",\n      \"method\": \"Comparative quantitative proteomics (TMT-based) of HCMV-infected vs. UL138-deletion mutant-infected cells; functional knockdown validation of BORCS7 effect on HCMV infection\",\n      \"journal\": \"Molecules (Basel, Switzerland)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, proteomics screen plus partial knockdown validation; no mechanistic pathway placement for BORCS7 specifically\",\n      \"pmids\": [\"32481657\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BORCS7 is a subunit of the BLOC-one-related complex (BORC) that tethers lysosomes to kinesin motors on microtubules to drive centrifugal (anterograde) lysosome transport in neurons; loss of BORCS7 in mice impairs axonal lysosome transport, causes progressive dystrophic axonopathy and motor deficits, and complete knockout is neonatal lethal, while overexpression in mouse prefrontal cortex produces schizophrenia-like behaviors.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BORCS7 is a subunit of the BLOC-one-related complex (BORC) that controls the spatial positioning of lysosomes within the cytoplasm [#1]. BORC tethers lysosomes to the kinesin microtubule motor to drive their centrifugal (anterograde) transport, and BORCS7 is essential for this tethering function [#3]. In mice, a truncating mutation in Borcs7 impairs anterograde lysosome transport in neurons and produces progressive axonal dystrophy with severe motor impairment, while complete deletion of the coding sequence is neonatal lethal, establishing BORCS7 as a central factor in axonal lysosome transport [#0]. Beyond lysosome positioning, BORCS7 is genetically and functionally linked to psychiatric and disease contexts: schizophrenia risk alleles at the 10q24.32 locus are associated with selectively increased BORCS7 brain expression [#1], and overexpression of Borcs7 in the mouse medial prefrontal cortex produces schizophrenia-like behaviors including abnormal prepulse inhibition and social dysfunction [#5]. Direct biochemical reconstitution of the BORC complex with isolated BORCS7 has not been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Established BORCS7 as a BORC subunit governing intracellular lysosome distribution and connected it to human disease genetics, addressing whether the gene has a defined cellular role and brain relevance.\",\n      \"evidence\": \"GWAS risk-SNP expression analysis, immunohistochemistry in human brain, and stem-cell neuronal differentiation assays\",\n      \"pmids\": [\"27158905\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Complex membership inferred from prior BORC literature rather than direct biochemical reconstitution here\", \"No mechanistic link between increased expression and behavioral or cellular phenotype\", \"Causal direction of the schizophrenia eQTL association not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated that BORCS7 is required in vivo for anterograde axonal lysosome transport and that its loss causes axonopathy and motor disease, answering whether the lysosome-positioning role has organismal consequences.\",\n      \"evidence\": \"Whole-genome sequencing of a spontaneous mutant, genetic complementation, knockout mouse generation, live-cell lysosome transport imaging in neurons, and behavioral motor assays\",\n      \"pmids\": [\"30067980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve the molecular interface by which BORCS7 couples lysosomes to kinesin\", \"Mechanism linking impaired transport to axonal dystrophy not detailed\", \"Cause of neonatal lethality in full knockouts not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Consolidated the model that BORC, via BORCS7, tethers lysosomes to kinesin for centrifugal positioning, framing the mechanistic interpretation of the mutant phenotype.\",\n      \"evidence\": \"Commentary synthesizing the primary Cell Reports lysosome-transport and motor-behavior data\",\n      \"pmids\": [\"30185380\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not provide new experimental evidence\", \"Identity of the kinesin and adaptor interactions for BORCS7 not directly tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Tested and excluded BORCS7 as the causal gene at the 10q24.32 blood pressure locus, clarifying which colocalized trait the gene does not drive.\",\n      \"evidence\": \"Morpholino splice-modification knockdown in zebrafish larvae with blood flow and arterial pulse measurements\",\n      \"pmids\": [\"32984406\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Negative result limited to blood pressure parameters in larval zebrafish\", \"Does not address neuronal or lysosomal phenotypes in this model\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Implicated BORCS7 in a host pathway exploited during viral infection, raising a non-neuronal functional context.\",\n      \"evidence\": \"TMT-based comparative proteomics of HCMV-infected versus UL138-deletion mutant cells with knockdown validation of infection efficiency\",\n      \"pmids\": [\"32481657\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single lab screen with partial knockdown validation; no mechanistic pathway placement for BORCS7\", \"Connection to lysosomal trafficking role not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed that elevated BORCS7 dosage in prefrontal cortex is sufficient to produce schizophrenia-like behavior, linking the disease-associated expression increase to a causal circuit phenotype.\",\n      \"evidence\": \"Borcs7 overexpression in mouse mPFC with prepulse inhibition and social interaction phenotyping, supported by CRISPR deletion, luciferase reporter, and RT-qPCR\",\n      \"pmids\": [\"38718554\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single study, single lab\", \"Cellular mechanism linking BORCS7 overexpression to circuit dysfunction not defined\", \"Relationship between behavioral effect and lysosome transport unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How BORCS7 molecularly couples lysosomes to kinesin and how its dosage perturbs prefrontal circuits remains unresolved.\",\n      \"evidence\": \"No direct reconstitution or structural characterization of BORCS7 within BORC, nor a mechanistic link between transport and behavior, is present in the corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No biochemical reconstitution of BORCS7 in the BORC complex\", \"Direct physical partners of BORCS7 not individually mapped\", \"Mechanistic bridge between lysosome transport and schizophrenia-like behavior absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"complexes\": [\"BORC (BLOC-one-related complex)\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}