{"gene":"RGS22","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2008,"finding":"RGS22 is a testis-specific protein that interacts with GNA12, GNA13, and GNA11 (heterotrimeric G-protein alpha subunits). The N-terminal domain of RGS22 localizes to the nucleus, and both RGS22 and GNA13 translocate to the nucleus from the elongated spermatid stage onward during spermiogenesis. Defective GNA13 expression was observed in macrocephalic and globally nucleus spermatozoa, suggesting RGS22 plays a role in GNA13 nuclear translocation during spermiogenesis.","method":"Co-immunoprecipitation, GFP-fusion protein subcellular tracking, indirect immunofluorescence, western blot","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and subcellular localization with functional context, single lab, multiple orthogonal methods","pmids":["18703424"],"is_preprint":false},{"year":2015,"finding":"RGS22 suppresses pancreatic adenocarcinoma cell migration by interacting with GNA12 and GNA13 via pull-down and co-immunoprecipitation. Overexpression of RGS22 delays F-actin stress fiber formation and cell deformation induced by lysophosphatidic acid (LPA), while knockdown of RGS22 increases migration. The mechanism involves RGS22 coupling to GNA12/13, which inhibits downstream stress fiber formation.","method":"Pull-down assay, co-immunoprecipitation, wound-healing assay, F-actin staining, RGS22 overexpression and knockdown in BXPC-3 cells","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and functional cell-based assays with gain- and loss-of-function, single lab, multiple orthogonal methods","pmids":["26323264"],"is_preprint":false},{"year":2011,"finding":"Overexpression of RGS22 in a highly metastatic esophageal cancer cell line decreases cell migration and reduces invasive potential, identifying RGS22 as a suppressor of epithelial cancer cell invasion and metastasis.","method":"RGS22 overexpression in esophageal cancer cell lines, migration and invasion assays, western blot, immunohistochemistry of tumor tissue arrays","journal":"Clinical & experimental metastasis","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — defined cellular phenotype with loss-of-function context, single lab, single functional readout","pmids":["21533872"],"is_preprint":false},{"year":2017,"finding":"miR-1260b directly targets RGS22 mRNA, inhibiting RGS22 expression, and this suppression promotes migration and invasion of hepatocellular carcinoma cells; knockdown of RGS22 increases HCC cell proliferation.","method":"miR-1260b overexpression, luciferase reporter assay (implied target validation), RGS22 knockdown, migration and invasion assays in HepG2 and SMMC-7721 cells","journal":"Biotechnology letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, functional cell assays with implied direct targeting, limited mechanistic detail in abstract","pmids":["29038925"],"is_preprint":false},{"year":2024,"finding":"RGS22 deficiency in mice and rats causes severe congenital hydrocephalus through ependymal denudation and impaired ciliogenesis. RGS22 is specifically expressed in ependymal cells of the brain, and conditional knockout restricted to the nervous system is sufficient to induce hydrocephalus. Mechanistically, Rgs22 deficiency leads to excessive activation of lysophosphatidic acid receptor (LPAR) signaling, and pharmacological LPAR blockade alleviates hydrocephalus in Rgs22-/- rats.","method":"Constitutive and conditional knockout mice and rats, histology, immunofluorescence, LPAR pharmacological blockade rescue experiment","journal":"Science China. Life sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with defined cellular phenotype, pathway rescue by pharmacological intervention, multiple orthogonal methods, mechanistic placement upstream of LPAR signaling","pmids":["39400871"],"is_preprint":false},{"year":2022,"finding":"The transcription factor YY1 positively regulates RGS22 expression in pancreatic ductal adenocarcinoma, and YY1-mediated RGS22 upregulation suppresses proliferation, migration, and invasion of PDAC cells in vitro and in vivo.","method":"YY1 manipulation, RGS22 overexpression and knockdown in PDAC cell lines, subcutaneous xenograft mouse model, proliferation/invasion/migration assays","journal":"Oncology letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo gain/loss-of-function with transcription factor identification, single lab, multiple assays","pmids":["36380881"],"is_preprint":false}],"current_model":"RGS22 is a regulator of G-protein signaling that interacts with Gα12/13 family subunits (GNA12, GNA13, GNA11) to suppress LPA receptor-driven cytoskeletal remodeling (F-actin stress fiber formation) and cell migration; in the brain it is expressed specifically in ependymal cells where it restrains LPAR signaling to maintain ciliogenesis and CSF flow, and its loss causes hydrocephalus; during spermiogenesis it facilitates nuclear translocation of GNA13 in elongating spermatids; and its expression is transcriptionally activated by YY1, with loss of RGS22 promoting invasion and metastasis in epithelial cancers."},"narrative":{"mechanistic_narrative":"RGS22 is a regulator of G-protein signaling that restrains Gα12/13-family-driven cytoskeletal remodeling and cell motility across reproductive, neural, and oncogenic contexts [PMID:18703424, PMID:26323264, PMID:39400871]. It physically associates with the heterotrimeric G-protein α subunits GNA12, GNA13, and GNA11, and through coupling to GNA12/13 it delays lysophosphatidic acid (LPA)-induced F-actin stress fiber formation and cell deformation, thereby suppressing migration; loss of RGS22 increases motility and invasive potential in pancreatic, esophageal, and hepatocellular carcinoma cells [PMID:18703424, PMID:26323264, PMID:21533872, PMID:29038925]. In the brain, RGS22 is expressed specifically in ependymal cells, where it restrains excessive LPAR signaling to support ciliogenesis; its loss causes severe congenital hydrocephalus that is alleviated by pharmacological LPAR blockade, establishing RGS22 as an upstream negative regulator of the LPAR axis [PMID:39400871]. During spermiogenesis, RGS22 partitions to the nucleus via its N-terminal domain and facilitates the nuclear translocation of GNA13 from the elongated spermatid stage onward [PMID:18703424]. Its expression is transcriptionally activated by the transcription factor YY1, and YY1-driven RGS22 upregulation suppresses tumor cell proliferation, migration, and invasion in vitro and in vivo [PMID:36380881].","teleology":[{"year":2008,"claim":"Established RGS22's first physical partners and a developmental role by showing it binds Gα12/13/11 subunits and escorts GNA13 to the nucleus during sperm maturation.","evidence":"Co-immunoprecipitation, GFP-fusion subcellular tracking, and immunofluorescence in testis/spermatid systems","pmids":["18703424"],"confidence":"Medium","gaps":["Direct GAP/RGS catalytic activity on the Gα subunits not demonstrated","Mechanism by which RGS22 drives GNA13 nuclear import unresolved","Functional consequence for sperm physiology shown only by correlation with abnormal spermatozoa"]},{"year":2011,"claim":"Defined RGS22 as a suppressor of cancer cell invasion, linking its loss to metastatic phenotype.","evidence":"RGS22 overexpression with migration/invasion assays and tumor tissue immunohistochemistry in esophageal cancer cells","pmids":["21533872"],"confidence":"Medium","gaps":["Single functional readout per condition","Molecular mechanism of invasion suppression not addressed in this study"]},{"year":2015,"claim":"Connected the anti-migratory role to a signaling mechanism by showing RGS22 couples to GNA12/13 to block LPA-induced stress fiber formation.","evidence":"Pull-down, co-IP, wound-healing, and F-actin staining with gain- and loss-of-function in BXPC-3 pancreatic cancer cells","pmids":["26323264"],"confidence":"Medium","gaps":["Does not establish whether RGS22 acts as a GAP toward Gα12/13","Downstream effectors between Gα12/13 and the actin cytoskeleton not mapped"]},{"year":2017,"claim":"Placed RGS22 downstream of a microRNA regulatory input, implicating its repression in liver cancer progression.","evidence":"miR-1260b overexpression, RGS22 knockdown, and migration/invasion/proliferation assays in HCC cell lines","pmids":["29038925"],"confidence":"Low","gaps":["Direct targeting inferred rather than rigorously demonstrated in the abstract","Limited mechanistic detail beyond phenotype","Single lab"]},{"year":2022,"claim":"Identified an upstream transcriptional activator, showing YY1 drives RGS22 expression to enforce tumor-suppressive phenotypes.","evidence":"YY1 manipulation with RGS22 gain/loss-of-function in PDAC lines plus xenograft model","pmids":["36380881"],"confidence":"Medium","gaps":["Direct YY1 binding to the RGS22 promoter not detailed","Link between YY1-RGS22 axis and Gα12/13 signaling not directly tested"]},{"year":2024,"claim":"Demonstrated a physiological, organ-specific function by showing ependymal RGS22 restrains LPAR signaling to maintain ciliogenesis, with loss causing hydrocephalus rescuable by LPAR blockade.","evidence":"Constitutive and nervous-system conditional knockout mice and rats with histology, immunofluorescence, and pharmacological LPAR rescue","pmids":["39400871"],"confidence":"High","gaps":["Whether RGS22 acts directly on a specific Gα subunit downstream of LPAR in ependymal cells not biochemically resolved","Molecular link between LPAR hyperactivation and cilia loss not fully mapped"]},{"year":null,"claim":"Whether RGS22 possesses canonical RGS GAP catalytic activity toward its bound Gα subunits, or acts purely as a scaffold/sequestering regulator, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No reconstituted GAP assay reported","No structural model of the RGS22-Gα interface","Substrate specificity among GNA11/12/13 not biochemically dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,4]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,4]}],"complexes":[],"partners":["GNA13","GNA12","GNA11"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NE09","full_name":"Regulator of G-protein signaling 22","aliases":[],"length_aa":1264,"mass_kda":147.2,"function":"Inhibits signal transduction by increasing the GTPase activity of G protein alpha subunits thereby driving them into their inactive GDP-bound form","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q8NE09/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RGS22","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RGS22","total_profiled":1310},"omim":[{"mim_id":"615650","title":"REGULATOR OF G PROTEIN SIGNALING 22; RGS22","url":"https://www.omim.org/entry/615650"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli fibrillar center","reliability":"Supported"},{"location":"Actin filaments","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"testis","ntpm":57.3}],"url":"https://www.proteinatlas.org/search/RGS22"},"hgnc":{"alias_symbol":["DKFZP434I092","PRTD-NY2","CT145"],"prev_symbol":[]},"alphafold":{"accession":"Q8NE09","domains":[{"cath_id":"-","chopping":"4-77_101-163","consensus_level":"medium","plddt":80.5293,"start":4,"end":163},{"cath_id":"1.10.167","chopping":"417-529","consensus_level":"medium","plddt":82.1999,"start":417,"end":529},{"cath_id":"1.10.167.10","chopping":"687-788","consensus_level":"high","plddt":84.3971,"start":687,"end":788},{"cath_id":"1.10.167.10","chopping":"843-991","consensus_level":"high","plddt":80.5876,"start":843,"end":991},{"cath_id":"1.10.167.10","chopping":"1018-1163","consensus_level":"high","plddt":80.8545,"start":1018,"end":1163}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NE09","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NE09-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NE09-F1-predicted_aligned_error_v6.png","plddt_mean":64.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RGS22","jax_strain_url":"https://www.jax.org/strain/search?query=RGS22"},"sequence":{"accession":"Q8NE09","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NE09.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NE09/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NE09"}},"corpus_meta":[{"pmid":"26474971","id":"PMC_26474971","title":"A genome-wide approach to link genotype to clinical outcome by utilizing next generation sequencing and gene chip data of 6,697 breast cancer patients.","date":"2015","source":"Genome medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26474971","citation_count":70,"is_preprint":false},{"pmid":"29128211","id":"PMC_29128211","title":"Genome-wide association studies to identify quantitative trait loci affecting milk production traits in water buffalo.","date":"2017","source":"Journal of dairy science","url":"https://pubmed.ncbi.nlm.nih.gov/29128211","citation_count":57,"is_preprint":false},{"pmid":"24403052","id":"PMC_24403052","title":"Germline sequence variants in TGM3 and RGS22 confer risk of basal cell carcinoma.","date":"2014","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24403052","citation_count":45,"is_preprint":false},{"pmid":"28219342","id":"PMC_28219342","title":"Effects of exposure to Streptococcus iniae on microRNA expression in the head kidney of genetically improved farmed tilapia (Oreochromis niloticus).","date":"2017","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/28219342","citation_count":34,"is_preprint":false},{"pmid":"31134708","id":"PMC_31134708","title":"Proteomic markers of low and high fertility bovine spermatozoa separated by Percoll gradient.","date":"2019","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/31134708","citation_count":29,"is_preprint":false},{"pmid":"14500499","id":"PMC_14500499","title":"Identification of two eukaryote-like serine/threonine kinases encoded by Chlamydia trachomatis serovar L2 and characterization of interacting partners of Pkn1.","date":"2003","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/14500499","citation_count":26,"is_preprint":false},{"pmid":"18703424","id":"PMC_18703424","title":"RGS22, a novel testis-specific regulator of G-protein signaling involved in human and mouse spermiogenesis along with GNA12/13 subunits.","date":"2008","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/18703424","citation_count":24,"is_preprint":false},{"pmid":"21533872","id":"PMC_21533872","title":"RGS22, a novel cancer/testis antigen, inhibits epithelial cell invasion and metastasis.","date":"2011","source":"Clinical & experimental metastasis","url":"https://pubmed.ncbi.nlm.nih.gov/21533872","citation_count":22,"is_preprint":false},{"pmid":"29038925","id":"PMC_29038925","title":"miR-1260b promotes cell migration and invasion of hepatocellular carcinoma by targeting the regulator of G-protein signaling 22.","date":"2017","source":"Biotechnology letters","url":"https://pubmed.ncbi.nlm.nih.gov/29038925","citation_count":20,"is_preprint":false},{"pmid":"26323264","id":"PMC_26323264","title":"RGS22 inhibits pancreatic adenocarcinoma cell migration through the G12/13 α subunit/F-actin pathway.","date":"2015","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/26323264","citation_count":14,"is_preprint":false},{"pmid":"38124114","id":"PMC_38124114","title":"A comprehensive characterisation of phaeochromocytoma and paraganglioma tumours through histone protein profiling, DNA methylation and transcriptomic analysis genome wide.","date":"2023","source":"Clinical epigenetics","url":"https://pubmed.ncbi.nlm.nih.gov/38124114","citation_count":13,"is_preprint":false},{"pmid":"39400871","id":"PMC_39400871","title":"RGS22 maintains the physiological function of ependymal cells to prevent hydrocephalus.","date":"2024","source":"Science China. Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39400871","citation_count":4,"is_preprint":false},{"pmid":"36380881","id":"PMC_36380881","title":"Suppressive effect of YY1-mediated RGS22 regulation on the proliferation, migration and invasion of pancreatic ductal adenocarcinoma.","date":"2022","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/36380881","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8875,"output_tokens":1663,"usd":0.025785,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8460,"output_tokens":2278,"usd":0.049625,"stage2_stop_reason":"end_turn"},"total_usd":0.07541,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"RGS22 is a testis-specific protein that interacts with GNA12, GNA13, and GNA11 (heterotrimeric G-protein alpha subunits). The N-terminal domain of RGS22 localizes to the nucleus, and both RGS22 and GNA13 translocate to the nucleus from the elongated spermatid stage onward during spermiogenesis. Defective GNA13 expression was observed in macrocephalic and globally nucleus spermatozoa, suggesting RGS22 plays a role in GNA13 nuclear translocation during spermiogenesis.\",\n      \"method\": \"Co-immunoprecipitation, GFP-fusion protein subcellular tracking, indirect immunofluorescence, western blot\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and subcellular localization with functional context, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"18703424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RGS22 suppresses pancreatic adenocarcinoma cell migration by interacting with GNA12 and GNA13 via pull-down and co-immunoprecipitation. Overexpression of RGS22 delays F-actin stress fiber formation and cell deformation induced by lysophosphatidic acid (LPA), while knockdown of RGS22 increases migration. The mechanism involves RGS22 coupling to GNA12/13, which inhibits downstream stress fiber formation.\",\n      \"method\": \"Pull-down assay, co-immunoprecipitation, wound-healing assay, F-actin staining, RGS22 overexpression and knockdown in BXPC-3 cells\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and functional cell-based assays with gain- and loss-of-function, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"26323264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Overexpression of RGS22 in a highly metastatic esophageal cancer cell line decreases cell migration and reduces invasive potential, identifying RGS22 as a suppressor of epithelial cancer cell invasion and metastasis.\",\n      \"method\": \"RGS22 overexpression in esophageal cancer cell lines, migration and invasion assays, western blot, immunohistochemistry of tumor tissue arrays\",\n      \"journal\": \"Clinical & experimental metastasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — defined cellular phenotype with loss-of-function context, single lab, single functional readout\",\n      \"pmids\": [\"21533872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"miR-1260b directly targets RGS22 mRNA, inhibiting RGS22 expression, and this suppression promotes migration and invasion of hepatocellular carcinoma cells; knockdown of RGS22 increases HCC cell proliferation.\",\n      \"method\": \"miR-1260b overexpression, luciferase reporter assay (implied target validation), RGS22 knockdown, migration and invasion assays in HepG2 and SMMC-7721 cells\",\n      \"journal\": \"Biotechnology letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, functional cell assays with implied direct targeting, limited mechanistic detail in abstract\",\n      \"pmids\": [\"29038925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RGS22 deficiency in mice and rats causes severe congenital hydrocephalus through ependymal denudation and impaired ciliogenesis. RGS22 is specifically expressed in ependymal cells of the brain, and conditional knockout restricted to the nervous system is sufficient to induce hydrocephalus. Mechanistically, Rgs22 deficiency leads to excessive activation of lysophosphatidic acid receptor (LPAR) signaling, and pharmacological LPAR blockade alleviates hydrocephalus in Rgs22-/- rats.\",\n      \"method\": \"Constitutive and conditional knockout mice and rats, histology, immunofluorescence, LPAR pharmacological blockade rescue experiment\",\n      \"journal\": \"Science China. Life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with defined cellular phenotype, pathway rescue by pharmacological intervention, multiple orthogonal methods, mechanistic placement upstream of LPAR signaling\",\n      \"pmids\": [\"39400871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The transcription factor YY1 positively regulates RGS22 expression in pancreatic ductal adenocarcinoma, and YY1-mediated RGS22 upregulation suppresses proliferation, migration, and invasion of PDAC cells in vitro and in vivo.\",\n      \"method\": \"YY1 manipulation, RGS22 overexpression and knockdown in PDAC cell lines, subcutaneous xenograft mouse model, proliferation/invasion/migration assays\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo gain/loss-of-function with transcription factor identification, single lab, multiple assays\",\n      \"pmids\": [\"36380881\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RGS22 is a regulator of G-protein signaling that interacts with Gα12/13 family subunits (GNA12, GNA13, GNA11) to suppress LPA receptor-driven cytoskeletal remodeling (F-actin stress fiber formation) and cell migration; in the brain it is expressed specifically in ependymal cells where it restrains LPAR signaling to maintain ciliogenesis and CSF flow, and its loss causes hydrocephalus; during spermiogenesis it facilitates nuclear translocation of GNA13 in elongating spermatids; and its expression is transcriptionally activated by YY1, with loss of RGS22 promoting invasion and metastasis in epithelial cancers.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RGS22 is a regulator of G-protein signaling that restrains Gα12/13-family-driven cytoskeletal remodeling and cell motility across reproductive, neural, and oncogenic contexts [#0, #1, #4]. It physically associates with the heterotrimeric G-protein α subunits GNA12, GNA13, and GNA11, and through coupling to GNA12/13 it delays lysophosphatidic acid (LPA)-induced F-actin stress fiber formation and cell deformation, thereby suppressing migration; loss of RGS22 increases motility and invasive potential in pancreatic, esophageal, and hepatocellular carcinoma cells [#0, #1, #2, #3]. In the brain, RGS22 is expressed specifically in ependymal cells, where it restrains excessive LPAR signaling to support ciliogenesis; its loss causes severe congenital hydrocephalus that is alleviated by pharmacological LPAR blockade, establishing RGS22 as an upstream negative regulator of the LPAR axis [#4]. During spermiogenesis, RGS22 partitions to the nucleus via its N-terminal domain and facilitates the nuclear translocation of GNA13 from the elongated spermatid stage onward [#0]. Its expression is transcriptionally activated by the transcription factor YY1, and YY1-driven RGS22 upregulation suppresses tumor cell proliferation, migration, and invasion in vitro and in vivo [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established RGS22's first physical partners and a developmental role by showing it binds Gα12/13/11 subunits and escorts GNA13 to the nucleus during sperm maturation.\",\n      \"evidence\": \"Co-immunoprecipitation, GFP-fusion subcellular tracking, and immunofluorescence in testis/spermatid systems\",\n      \"pmids\": [\"18703424\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GAP/RGS catalytic activity on the Gα subunits not demonstrated\", \"Mechanism by which RGS22 drives GNA13 nuclear import unresolved\", \"Functional consequence for sperm physiology shown only by correlation with abnormal spermatozoa\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined RGS22 as a suppressor of cancer cell invasion, linking its loss to metastatic phenotype.\",\n      \"evidence\": \"RGS22 overexpression with migration/invasion assays and tumor tissue immunohistochemistry in esophageal cancer cells\",\n      \"pmids\": [\"21533872\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single functional readout per condition\", \"Molecular mechanism of invasion suppression not addressed in this study\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected the anti-migratory role to a signaling mechanism by showing RGS22 couples to GNA12/13 to block LPA-induced stress fiber formation.\",\n      \"evidence\": \"Pull-down, co-IP, wound-healing, and F-actin staining with gain- and loss-of-function in BXPC-3 pancreatic cancer cells\",\n      \"pmids\": [\"26323264\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish whether RGS22 acts as a GAP toward Gα12/13\", \"Downstream effectors between Gα12/13 and the actin cytoskeleton not mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed RGS22 downstream of a microRNA regulatory input, implicating its repression in liver cancer progression.\",\n      \"evidence\": \"miR-1260b overexpression, RGS22 knockdown, and migration/invasion/proliferation assays in HCC cell lines\",\n      \"pmids\": [\"29038925\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Direct targeting inferred rather than rigorously demonstrated in the abstract\", \"Limited mechanistic detail beyond phenotype\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified an upstream transcriptional activator, showing YY1 drives RGS22 expression to enforce tumor-suppressive phenotypes.\",\n      \"evidence\": \"YY1 manipulation with RGS22 gain/loss-of-function in PDAC lines plus xenograft model\",\n      \"pmids\": [\"36380881\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct YY1 binding to the RGS22 promoter not detailed\", \"Link between YY1-RGS22 axis and Gα12/13 signaling not directly tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated a physiological, organ-specific function by showing ependymal RGS22 restrains LPAR signaling to maintain ciliogenesis, with loss causing hydrocephalus rescuable by LPAR blockade.\",\n      \"evidence\": \"Constitutive and nervous-system conditional knockout mice and rats with histology, immunofluorescence, and pharmacological LPAR rescue\",\n      \"pmids\": [\"39400871\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RGS22 acts directly on a specific Gα subunit downstream of LPAR in ependymal cells not biochemically resolved\", \"Molecular link between LPAR hyperactivation and cilia loss not fully mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether RGS22 possesses canonical RGS GAP catalytic activity toward its bound Gα subunits, or acts purely as a scaffold/sequestering regulator, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reconstituted GAP assay reported\", \"No structural model of the RGS22-Gα interface\", \"Substrate specificity among GNA11/12/13 not biochemically dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GNA13\", \"GNA12\", \"GNA11\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}