{"gene":"PARD6G","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2012,"finding":"Par6γ (PARD6G) localizes specifically to the mother centriole, and this localization requires the Par6γ C-terminus but is independent of intact microtubules, the dynein/dynactin complex, and components of the PAR polarity complex.","method":"Immunofluorescence localization, deletion/truncation constructs, pharmacological disruption of microtubules, siRNA depletion of dynein/dynactin and PAR complex components","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with multiple orthogonal controls (domain mapping, microtubule disruption, siRNA of complex components), single lab but multiple methods","pmids":["23264737"],"is_preprint":false},{"year":2012,"finding":"Depletion of Par6γ results in loss of a large number of centrosomal proteins, including Par6α and p150(Glued), from the centrosome, leading to defects in ciliogenesis, microtubule organization, and centrosome reorientation during cell migration.","method":"siRNA knockdown of Par6γ followed by immunofluorescence assessment of centrosomal protein composition, ciliogenesis assays, microtubule organization assays, and scratch-wound migration assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean siRNA knockdown with multiple defined cellular phenotypic readouts (ciliogenesis, microtubule organization, centrosome reorientation), single lab with multiple orthogonal assays","pmids":["23264737"],"is_preprint":false},{"year":2012,"finding":"Par6γ interacts with Par3 and aPKC, but these interactions are not required for the regulation of centrosomal protein composition; Par6γ also associates with Par6α, which controls protein recruitment to the centrosome through p150(Glued).","method":"Co-immunoprecipitation of Par6γ with Par3, aPKC, and Par6α; siRNA depletion of Par3 and aPKC showing no effect on centrosomal composition; siRNA of Par6α showing loss of centrosomal protein recruitment","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus epistatic siRNA experiments distinguishing required from dispensable interactions, single lab with multiple orthogonal methods","pmids":["23264737"],"is_preprint":false},{"year":2012,"finding":"Knockdown of Pard6g in osteoblast-lineage cells altered both osteoblast proliferation and differentiation, identifying PARD6G as a functional hub gene in an osteoblast-specific gene network.","method":"siRNA knockdown of Pard6g in osteoblast-lineage cells with proliferation and differentiation assays; co-expression network analysis in the Hybrid Mouse Diversity Panel","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean knockdown with defined cellular phenotype (proliferation and differentiation), single lab, single method per phenotype","pmids":["23300464"],"is_preprint":false},{"year":2012,"finding":"HBV DNA integration upstream of the PARD6G locus was associated with overexpression of PARD6G in tumour versus non-tumour liver tissue in a hepatocellular carcinoma patient, suggesting PARD6G can be activated by nearby viral integration.","method":"HBV-Alu PCR sequencing of viral-host DNA junction, real-time PCR quantification of PARD6G expression in paired tumour/non-tumour tissues","journal":"Journal of hepatology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient case with correlative expression measurement, no functional experiment establishing mechanism","pmids":["22989571"],"is_preprint":false},{"year":2025,"finding":"In vitro, PARD6G overexpression suppressed HNSCC cell proliferation and cell-cycle progression, while PARD6G knockdown promoted tumor growth; in vivo, PARD6G-deficient tumors exhibited accelerated growth and resistance to anti-PD-1 treatment accompanied by a reshaped immunosuppressive microenvironment.","method":"PARD6G overexpression and siRNA knockdown in HNSCC cell lines (proliferation, cell-cycle assays); syngeneic mouse tumor models with PARD6G knockout and anti-PD-1 treatment; immune infiltration profiling","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo loss/gain-of-function with defined phenotypic readouts (proliferation, cell cycle, tumor growth, immune landscape), single lab with multiple orthogonal methods","pmids":["42235314"],"is_preprint":false}],"current_model":"PARD6G (Par6γ) is a polarity scaffold protein that localizes specifically to the mother centriole via its C-terminus, where it regulates centrosomal protein composition through a Par6α–p150(Glued) pathway, thereby controlling ciliogenesis, microtubule organization, and centrosome reorientation during migration; it also interacts with Par3 and aPKC but these interactions are dispensable for centrosomal composition control, and it functions as a tumor suppressor in squamous cell carcinoma by restraining cell proliferation and shaping the immune microenvironment."},"narrative":{"mechanistic_narrative":"PARD6G (Par6γ) is a polarity scaffold protein that controls centrosomal protein composition and centrosome-dependent processes including ciliogenesis, microtubule organization, and centrosome reorientation during cell migration [PMID:23264737]. It localizes specifically to the mother centriole through its C-terminus, independently of intact microtubules, the dynein/dynactin complex, and the PAR polarity complex [PMID:23264737]. Depletion of Par6γ strips a large set of centrosomal proteins—including Par6α and p150(Glued)—from the centrosome, and Par6γ controls recruitment via association with Par6α acting through p150(Glued) [PMID:23264737]. Although Par6γ binds Par3 and aPKC, these interactions are dispensable for its control of centrosomal composition [PMID:23264737]. Beyond its centrosomal role, PARD6G regulates osteoblast proliferation and differentiation as a hub gene in an osteoblast-specific network [PMID:23300464], and acts as a tumor suppressor in head and neck squamous cell carcinoma, restraining cell proliferation and cell-cycle progression while shaping the anti-tumor immune microenvironment and response to anti-PD-1 therapy [PMID:42235314].","teleology":[{"year":2012,"claim":"Established where Par6γ acts within the cell and what targets its localization, defining it as a mother-centriole-resident protein dependent on its own C-terminus rather than on canonical transport or polarity machinery.","evidence":"Immunofluorescence with truncation constructs plus microtubule disruption and siRNA of dynein/dynactin and PAR components","pmids":["23264737"],"confidence":"High","gaps":["The molecular anchor at the mother centriole that recognizes the C-terminus is not identified","Structural basis of C-terminal targeting not resolved"]},{"year":2012,"claim":"Showed that Par6γ is required to maintain centrosomal protein composition and the downstream centrosome functions, moving it from a localized marker to a functional organizer of the centrosome.","evidence":"siRNA knockdown with ciliogenesis, microtubule organization, and scratch-wound centrosome reorientation readouts","pmids":["23264737"],"confidence":"High","gaps":["The full set of dependent centrosomal proteins is not enumerated","Whether effects are direct or secondary to loss of Par6α/p150(Glued) is not fully separated"]},{"year":2012,"claim":"Distinguished required from dispensable Par6γ interactions, placing centrosomal composition control on a Par6α–p150(Glued) axis rather than the Par3/aPKC polarity pathway.","evidence":"Reciprocal Co-IP of Par6γ with Par3, aPKC, and Par6α plus epistatic siRNA of each partner","pmids":["23264737"],"confidence":"High","gaps":["Whether Par6γ binds p150(Glued) directly or only via Par6α is unresolved","Functional purpose of the Par3/aPKC interactions remains unknown"]},{"year":2012,"claim":"Extended PARD6G function to tissue-level biology by identifying it as a regulator of osteoblast proliferation and differentiation.","evidence":"siRNA knockdown in osteoblast-lineage cells with proliferation/differentiation assays and co-expression network analysis","pmids":["23300464"],"confidence":"Medium","gaps":["Whether the osteoblast phenotype depends on the centrosomal mechanism is untested","Single method per phenotype"]},{"year":2012,"claim":"Raised the possibility that PARD6G expression can be deregulated in cancer through nearby viral integration.","evidence":"HBV-Alu PCR of viral-host junction and qPCR of PARD6G in paired HCC tumor/non-tumor tissue","pmids":["22989571"],"confidence":"Low","gaps":["Single patient case with correlative expression only, no functional experiment","No causal link between integration and tumorigenesis established"]},{"year":2025,"claim":"Defined PARD6G as a tumor suppressor in HNSCC that restrains proliferation and influences immunotherapy response, connecting its cell-intrinsic role to the tumor immune microenvironment.","evidence":"Overexpression/knockdown in HNSCC lines (proliferation, cell cycle) and syngeneic PARD6G-knockout tumor models with anti-PD-1 and immune infiltration profiling","pmids":["42235314"],"confidence":"Medium","gaps":["The molecular link between centrosomal function and proliferation/immune effects is not defined","Mechanism of immune microenvironment remodeling not resolved"]},{"year":null,"claim":"How Par6γ's centrosomal scaffolding activity mechanistically connects to its tissue-specific roles in osteoblasts and tumor suppression remains unresolved.","evidence":"No discovery in the corpus links the centrosomal mechanism to the proliferation/immune phenotypes","pmids":[],"confidence":"Low","gaps":["No unifying mechanism connecting centrosome composition to proliferation control","Direct binding partner at the mother centriole unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,2]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1]}],"pathway":[],"complexes":[],"partners":["PARD6A","PARD3","PRKCZ","DCTN1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BYG4","full_name":"Partitioning defective 6 homolog gamma","aliases":["PAR6D"],"length_aa":376,"mass_kda":40.9,"function":"Adapter protein involved in asymmetrical cell division and cell polarization processes. May play a role in the formation of epithelial tight junctions. The PARD6-PARD3 complex links GTP-bound Rho small GTPases to atypical protein kinase C proteins (By similarity)","subcellular_location":"Cytoplasm; Cell membrane; Cell junction, tight junction","url":"https://www.uniprot.org/uniprotkb/Q9BYG4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PARD6G","classification":"Not Classified","n_dependent_lines":11,"n_total_lines":1208,"dependency_fraction":0.009105960264900662},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PARD6G","total_profiled":1310},"omim":[{"mim_id":"608976","title":"PAR6 FAMILY CELL POLARITY REGULATOR GAMMA; PARD6G","url":"https://www.omim.org/entry/608976"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skin 1","ntpm":35.9}],"url":"https://www.proteinatlas.org/search/PARD6G"},"hgnc":{"alias_symbol":["PAR-6G","PAR6gamma"],"prev_symbol":[]},"alphafold":{"accession":"Q9BYG4","domains":[{"cath_id":"3.10.20.90","chopping":"19-102","consensus_level":"high","plddt":89.1085,"start":19,"end":102},{"cath_id":"2.30.42.10","chopping":"145-255","consensus_level":"high","plddt":93.0518,"start":145,"end":255}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BYG4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BYG4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BYG4-F1-predicted_aligned_error_v6.png","plddt_mean":70.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PARD6G","jax_strain_url":"https://www.jax.org/strain/search?query=PARD6G"},"sequence":{"accession":"Q9BYG4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BYG4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BYG4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BYG4"}},"corpus_meta":[{"pmid":"30349119","id":"PMC_30349119","title":"Insights into imprinting from parent-of-origin phased methylomes and transcriptomes.","date":"2018","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30349119","citation_count":86,"is_preprint":false},{"pmid":"22576693","id":"PMC_22576693","title":"Expression and DNA methylation changes in human breast epithelial cells after bisphenol A exposure.","date":"2012","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/22576693","citation_count":83,"is_preprint":false},{"pmid":"23300464","id":"PMC_23300464","title":"Systems genetic analysis of osteoblast-lineage cells.","date":"2012","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23300464","citation_count":47,"is_preprint":false},{"pmid":"20682712","id":"PMC_20682712","title":"Gene array and fluorescence in situ hybridization biomarkers of activity of saracatinib (AZD0530), a Src inhibitor, in a preclinical model of colorectal cancer.","date":"2010","source":"Clinical cancer research : an official journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/20682712","citation_count":43,"is_preprint":false},{"pmid":"22957302","id":"PMC_22957302","title":"PAR6B is required for tight junction formation and activated PKCζ localization in breast cancer.","date":"2012","source":"American journal of cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/22957302","citation_count":33,"is_preprint":false},{"pmid":"26508088","id":"PMC_26508088","title":"Epigenome-Wide Association Study of Aggressive Behavior.","date":"2015","source":"Twin research and human genetics : the official journal of the International Society for Twin Studies","url":"https://pubmed.ncbi.nlm.nih.gov/26508088","citation_count":31,"is_preprint":false},{"pmid":"32184802","id":"PMC_32184802","title":"Genome-Wide Epistatic Interaction Networks Affecting Feed Efficiency in Duroc and Landrace Pigs.","date":"2020","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32184802","citation_count":30,"is_preprint":false},{"pmid":"22989571","id":"PMC_22989571","title":"Hepatitis B virus DNA integration in tumour tissue of a non-cirrhotic HFE-haemochromatosis patient with hepatocellular carcinoma.","date":"2012","source":"Journal of hepatology","url":"https://pubmed.ncbi.nlm.nih.gov/22989571","citation_count":24,"is_preprint":false},{"pmid":"22127647","id":"PMC_22127647","title":"A novel bayesian graphical model for genome-wide multi-SNP association mapping.","date":"2011","source":"Genetic epidemiology","url":"https://pubmed.ncbi.nlm.nih.gov/22127647","citation_count":24,"is_preprint":false},{"pmid":"23264737","id":"PMC_23264737","title":"Par6γ is at the mother centriole and controls centrosomal protein composition through a Par6α-dependent pathway.","date":"2012","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/23264737","citation_count":19,"is_preprint":false},{"pmid":"29545821","id":"PMC_29545821","title":"Maternal 5mCpG Imprints at the PARD6G-AS1 and GCSAML Differentially Methylated Regions Are Decoupled From Parent-of-Origin Expression Effects in Multiple Human Tissues.","date":"2018","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29545821","citation_count":14,"is_preprint":false},{"pmid":"36935420","id":"PMC_36935420","title":"A genome-wide association analysis of loss of ambulation in dystrophinopathy patients suggests multiple candidate modifiers of disease severity.","date":"2023","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/36935420","citation_count":14,"is_preprint":false},{"pmid":"33008348","id":"PMC_33008348","title":"Genetically-regulated transcriptomics & copy number variation of proctitis points to altered mitochondrial and DNA repair mechanisms in individuals of European ancestry.","date":"2020","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/33008348","citation_count":7,"is_preprint":false},{"pmid":"35327988","id":"PMC_35327988","title":"Network Meta-Analysis of Chicken Microarray Data following Avian Influenza Challenge-A Comparison of Highly and Lowly Pathogenic Strains.","date":"2022","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/35327988","citation_count":6,"is_preprint":false},{"pmid":"35549895","id":"PMC_35549895","title":"Introduction of loxP sites by electroporation in the mouse genome; a simple approach for conditional allele generation in complex targeting loci.","date":"2022","source":"BMC biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/35549895","citation_count":6,"is_preprint":false},{"pmid":"40357366","id":"PMC_40357366","title":"Integrative analysis of DNA methylation, RNA sequencing, and genomic variants in the cancer genome atlas (TCGA) to predict endometrial cancer recurrence.","date":"2025","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/40357366","citation_count":2,"is_preprint":false},{"pmid":"38188501","id":"PMC_38188501","title":"Case report: Complete paternal isodisomy on chromosome 18 induces methylation changes in PARD6G-AS1 promotor in a case with arthrogryposis.","date":"2023","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/38188501","citation_count":1,"is_preprint":false},{"pmid":"41110735","id":"PMC_41110735","title":"Polarity protein Par6: Unraveling its mechanisms in tumor development and research advances.","date":"2025","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/41110735","citation_count":1,"is_preprint":false},{"pmid":"42235314","id":"PMC_42235314","title":"PARD6G mediates resistance to PD-1 immune checkpoint blockade in head and neck squamous cell carcinoma.","date":"2026","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/42235314","citation_count":0,"is_preprint":false},{"pmid":"39871190","id":"PMC_39871190","title":"The multi-omics signatures of telomere length in childhood.","date":"2025","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/39871190","citation_count":0,"is_preprint":false},{"pmid":"40705804","id":"PMC_40705804","title":"Comprehensive characterization of the competitive endogenous RNA network revealing its immune-related functions in hepatic ischemia-reperfusion injury.","date":"2025","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/40705804","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13466,"output_tokens":1553,"usd":0.031846,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8358,"output_tokens":2154,"usd":0.04782,"stage2_stop_reason":"end_turn"},"total_usd":0.079666,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"Par6γ (PARD6G) localizes specifically to the mother centriole, and this localization requires the Par6γ C-terminus but is independent of intact microtubules, the dynein/dynactin complex, and components of the PAR polarity complex.\",\n      \"method\": \"Immunofluorescence localization, deletion/truncation constructs, pharmacological disruption of microtubules, siRNA depletion of dynein/dynactin and PAR complex components\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with multiple orthogonal controls (domain mapping, microtubule disruption, siRNA of complex components), single lab but multiple methods\",\n      \"pmids\": [\"23264737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Depletion of Par6γ results in loss of a large number of centrosomal proteins, including Par6α and p150(Glued), from the centrosome, leading to defects in ciliogenesis, microtubule organization, and centrosome reorientation during cell migration.\",\n      \"method\": \"siRNA knockdown of Par6γ followed by immunofluorescence assessment of centrosomal protein composition, ciliogenesis assays, microtubule organization assays, and scratch-wound migration assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean siRNA knockdown with multiple defined cellular phenotypic readouts (ciliogenesis, microtubule organization, centrosome reorientation), single lab with multiple orthogonal assays\",\n      \"pmids\": [\"23264737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Par6γ interacts with Par3 and aPKC, but these interactions are not required for the regulation of centrosomal protein composition; Par6γ also associates with Par6α, which controls protein recruitment to the centrosome through p150(Glued).\",\n      \"method\": \"Co-immunoprecipitation of Par6γ with Par3, aPKC, and Par6α; siRNA depletion of Par3 and aPKC showing no effect on centrosomal composition; siRNA of Par6α showing loss of centrosomal protein recruitment\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus epistatic siRNA experiments distinguishing required from dispensable interactions, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"23264737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Knockdown of Pard6g in osteoblast-lineage cells altered both osteoblast proliferation and differentiation, identifying PARD6G as a functional hub gene in an osteoblast-specific gene network.\",\n      \"method\": \"siRNA knockdown of Pard6g in osteoblast-lineage cells with proliferation and differentiation assays; co-expression network analysis in the Hybrid Mouse Diversity Panel\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean knockdown with defined cellular phenotype (proliferation and differentiation), single lab, single method per phenotype\",\n      \"pmids\": [\"23300464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HBV DNA integration upstream of the PARD6G locus was associated with overexpression of PARD6G in tumour versus non-tumour liver tissue in a hepatocellular carcinoma patient, suggesting PARD6G can be activated by nearby viral integration.\",\n      \"method\": \"HBV-Alu PCR sequencing of viral-host DNA junction, real-time PCR quantification of PARD6G expression in paired tumour/non-tumour tissues\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient case with correlative expression measurement, no functional experiment establishing mechanism\",\n      \"pmids\": [\"22989571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In vitro, PARD6G overexpression suppressed HNSCC cell proliferation and cell-cycle progression, while PARD6G knockdown promoted tumor growth; in vivo, PARD6G-deficient tumors exhibited accelerated growth and resistance to anti-PD-1 treatment accompanied by a reshaped immunosuppressive microenvironment.\",\n      \"method\": \"PARD6G overexpression and siRNA knockdown in HNSCC cell lines (proliferation, cell-cycle assays); syngeneic mouse tumor models with PARD6G knockout and anti-PD-1 treatment; immune infiltration profiling\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo loss/gain-of-function with defined phenotypic readouts (proliferation, cell cycle, tumor growth, immune landscape), single lab with multiple orthogonal methods\",\n      \"pmids\": [\"42235314\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PARD6G (Par6γ) is a polarity scaffold protein that localizes specifically to the mother centriole via its C-terminus, where it regulates centrosomal protein composition through a Par6α–p150(Glued) pathway, thereby controlling ciliogenesis, microtubule organization, and centrosome reorientation during migration; it also interacts with Par3 and aPKC but these interactions are dispensable for centrosomal composition control, and it functions as a tumor suppressor in squamous cell carcinoma by restraining cell proliferation and shaping the immune microenvironment.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PARD6G (Par6γ) is a polarity scaffold protein that controls centrosomal protein composition and centrosome-dependent processes including ciliogenesis, microtubule organization, and centrosome reorientation during cell migration [#1]. It localizes specifically to the mother centriole through its C-terminus, independently of intact microtubules, the dynein/dynactin complex, and the PAR polarity complex [#0]. Depletion of Par6γ strips a large set of centrosomal proteins—including Par6α and p150(Glued)—from the centrosome, and Par6γ controls recruitment via association with Par6α acting through p150(Glued) [#1, #2]. Although Par6γ binds Par3 and aPKC, these interactions are dispensable for its control of centrosomal composition [#2]. Beyond its centrosomal role, PARD6G regulates osteoblast proliferation and differentiation as a hub gene in an osteoblast-specific network [#3], and acts as a tumor suppressor in head and neck squamous cell carcinoma, restraining cell proliferation and cell-cycle progression while shaping the anti-tumor immune microenvironment and response to anti-PD-1 therapy [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established where Par6γ acts within the cell and what targets its localization, defining it as a mother-centriole-resident protein dependent on its own C-terminus rather than on canonical transport or polarity machinery.\",\n      \"evidence\": \"Immunofluorescence with truncation constructs plus microtubule disruption and siRNA of dynein/dynactin and PAR components\",\n      \"pmids\": [\"23264737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The molecular anchor at the mother centriole that recognizes the C-terminus is not identified\", \"Structural basis of C-terminal targeting not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed that Par6γ is required to maintain centrosomal protein composition and the downstream centrosome functions, moving it from a localized marker to a functional organizer of the centrosome.\",\n      \"evidence\": \"siRNA knockdown with ciliogenesis, microtubule organization, and scratch-wound centrosome reorientation readouts\",\n      \"pmids\": [\"23264737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The full set of dependent centrosomal proteins is not enumerated\", \"Whether effects are direct or secondary to loss of Par6α/p150(Glued) is not fully separated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Distinguished required from dispensable Par6γ interactions, placing centrosomal composition control on a Par6α–p150(Glued) axis rather than the Par3/aPKC polarity pathway.\",\n      \"evidence\": \"Reciprocal Co-IP of Par6γ with Par3, aPKC, and Par6α plus epistatic siRNA of each partner\",\n      \"pmids\": [\"23264737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Par6γ binds p150(Glued) directly or only via Par6α is unresolved\", \"Functional purpose of the Par3/aPKC interactions remains unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended PARD6G function to tissue-level biology by identifying it as a regulator of osteoblast proliferation and differentiation.\",\n      \"evidence\": \"siRNA knockdown in osteoblast-lineage cells with proliferation/differentiation assays and co-expression network analysis\",\n      \"pmids\": [\"23300464\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the osteoblast phenotype depends on the centrosomal mechanism is untested\", \"Single method per phenotype\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Raised the possibility that PARD6G expression can be deregulated in cancer through nearby viral integration.\",\n      \"evidence\": \"HBV-Alu PCR of viral-host junction and qPCR of PARD6G in paired HCC tumor/non-tumor tissue\",\n      \"pmids\": [\"22989571\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single patient case with correlative expression only, no functional experiment\", \"No causal link between integration and tumorigenesis established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined PARD6G as a tumor suppressor in HNSCC that restrains proliferation and influences immunotherapy response, connecting its cell-intrinsic role to the tumor immune microenvironment.\",\n      \"evidence\": \"Overexpression/knockdown in HNSCC lines (proliferation, cell cycle) and syngeneic PARD6G-knockout tumor models with anti-PD-1 and immune infiltration profiling\",\n      \"pmids\": [\"42235314\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The molecular link between centrosomal function and proliferation/immune effects is not defined\", \"Mechanism of immune microenvironment remodeling not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How Par6γ's centrosomal scaffolding activity mechanistically connects to its tissue-specific roles in osteoblasts and tumor suppression remains unresolved.\",\n      \"evidence\": \"No discovery in the corpus links the centrosomal mechanism to the proliferation/immune phenotypes\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying mechanism connecting centrosome composition to proliferation control\", \"Direct binding partner at the mother centriole unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [\"PARD6A\", \"PARD3\", \"PRKCZ\", \"DCTN1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}