{"gene":"MED22","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1993,"finding":"SRB6 (MED22) is a component of a high molecular weight multisubunit complex tightly bound to RNA polymerase II that also contains SRB2, SRB4, SRB5, and TATA-binding protein (TBP); this SRB-TBP complex binds specifically to recombinant CTD protein, and SRB6 was identified as a suppressor of CTD truncation mutations, placing it functionally in CTD-dependent transcription.","method":"Genetic suppressor screen (extragenic suppressors of CTD truncation mutants), biochemical co-purification, CTD-binding assay, in vitro transcription","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic epistasis combined with biochemical co-purification and in vitro transcription assays, replicated across multiple experiments in the same study","pmids":["8324825"],"is_preprint":false},{"year":1994,"finding":"SRB6 (MED22) is one of ~20 polypeptides comprising the yeast Mediator complex; Mediator enables activated transcription, confers greater basal transcription activity, and enhances CTD phosphorylation by TFIIH-associated CTD kinase, indicating a Mediator-CTD interaction. SRB6 was identified as a cross-reactive component of the holoenzyme form of RNA polymerase II.","method":"Biochemical purification of Mediator from yeast, reconstituted in vitro transcription with homogeneous factors, immunological identification with antisera against SRB6","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro transcription system with homogeneous factors, multiple orthogonal methods (purification, immunoreactivity, transcription assay)","pmids":["8187178"],"is_preprint":false},{"year":1998,"finding":"SRB6 (MED22) is an essential component of the RNA polymerase II holoenzyme required for transcription of most class II genes; it physically interacts with Srb4, and dominant mutations in SRB6 suppress a temperature-sensitive srb4 mutation, placing SRB6 in the same functional pathway as Srb4 in transcription activation.","method":"Dominant suppressor genetics (dosage suppression of srb4-ts), physical interaction assay (genetic and biochemical evidence of interaction with Srb4)","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis and physical interaction data, single lab, two complementary approaches","pmids":["9671455"],"is_preprint":false},{"year":1998,"finding":"Transcription of certain genes in yeast is independent of Srb4 and Srb6 (MED22), demonstrating that the Mediator/CTD-associated pathway is not universally required and that at least two distinct transcriptional activation pathways exist in vivo.","method":"Temperature-sensitive srb6 mutant analysis combined with copper-inducible targeted protein destruction, gene-specific transcription assays in vivo","journal":"Nature","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with defined transcriptional phenotype, single lab but multiple gene targets tested","pmids":["9620805"],"is_preprint":false},{"year":2003,"finding":"A mammalian homologue of yeast Srb6 (now MED22) was identified as a bona fide subunit of the mammalian Mediator complex purified from rat liver nuclei; direct pairwise binding partners of MED22 among known mammalian Mediator subunits were identified, contributing to the architectural model of mammalian Mediator.","method":"Tandem mass spectrometry of purified mammalian Mediator fractions, direct pairwise binding assays among Mediator subunits","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS identification from purified complex plus direct binding assays, single lab","pmids":["12584197"],"is_preprint":false},{"year":2008,"finding":"Med22 (MED22) is a subunit of the Mediator head module; interactions between Med11 and Med22 within the head module are functionally important for recruitment of TFIIH, TFIIE, and RNA Pol II to the preinitiation complex (PIC). Impairing the Med11-Med22 interaction differentially affects occupancy of these general transcription factors at promoters genome-wide, and reduces Pol II CTD serine 5 phosphorylation.","method":"Yeast genetics (mutant alleles impairing specific protein-protein interactions), ChIP-on-chip genome-wide promoter occupancy assays, Pol II CTD phosphorylation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP combined with interaction genetics and phosphorylation assay, multiple orthogonal methods, defined mechanistic pathway","pmids":["18691966"],"is_preprint":false},{"year":2012,"finding":"Med22 (MED22) is a conserved subunit of the Mediator head module. Crystal structure of the S. pombe head module at 3.4 Å resolution places Med22 within the head module architecture; the structure reveals high conservation and flexibility, and functional elements including the 'shoulder' contact other parts of Mediator. The joint element of the head module is required for transcription in vitro.","method":"X-ray crystallography of fission yeast Mediator head module at 3.4 Å; in vitro transcription assay validating the joint element","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure at near-atomic resolution with functional in vitro transcription validation, rigorous structural study","pmids":["23123849"],"is_preprint":false},{"year":2015,"finding":"Drosophila Med22 (MED22) is required for activation of hundreds of new transcripts in the spermatocyte transcriptional program. Med22 binds the testis meiotic arrest complex (tMAC) component Topi when co-expressed in S2 cells, suggesting direct recruitment of Mediator by tMAC. Loss of Med22 function in spermatocytes causes meiosis I maturation arrest and male infertility.","method":"Co-immunoprecipitation (Med22 binding to Topi in S2 cells), loss-of-function genetics in Drosophila male germline with fertility and meiosis phenotypic readout, microarray/transcriptomic validation of target genes","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP binding assay plus in vivo loss-of-function with defined cellular phenotype, single lab","pmids":["26624996"],"is_preprint":false},{"year":2017,"finding":"Drosophila Med22 (MED22) and the bromodomain proteins tBRD-1 and tBRD-2 co-regulate expression of a defined set of genes in primary spermatocytes required for spermatid differentiation, placing Med22 in a sequential regulatory hierarchy involving tMAC, Mediator, and tTAFs.","method":"Microarray comparison of mutant gene expression profiles (med22, aly, sa, tBRD-1, tBRD-2 mutants), genetic epistasis analysis","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via comparative transcriptomics, multiple mutants compared, single lab","pmids":["28235844"],"is_preprint":false},{"year":2020,"finding":"Podocyte-specific knockout of Med22 (MED22) in mice does not impair normal podocyte maturation but is critical for maintaining podocyte health; loss of Med22 leads to intracellular vacuole formation, progressive podocyte loss, glomerular disease, and premature death from renal failure, demonstrating an essential role for Mediator complex in kidney podocyte physiology.","method":"Conditional (podocyte-specific) Med22 knockout mouse, histological and ultrastructural morphological analyses, survival analysis with defined renal failure phenotype","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean tissue-specific KO with defined cellular and organismal phenotype, single lab, rigorous morphological characterization","pmids":["33208756"],"is_preprint":false},{"year":2022,"finding":"MED22 protein clusters tend to localize near the transcription start site of the Nanog gene in mouse embryonic stem cells even in the absence of transcriptional activity, in contrast to RNA Pol II and BRD4 clusters which are enriched proximal to the TSS only when the gene is being transcribed. This was determined using the STREAMING-tag live-cell imaging system.","method":"Live-cell single-molecule/cluster imaging (STREAMING-tag system combining MS2, TetO repeats, and intein-based reporter) in mouse embryonic stem cells","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live-cell localization experiment with functional (transcriptional activity) correlation, single lab, novel system","pmids":["36539402"],"is_preprint":false},{"year":1995,"finding":"The mouse Surf5 protein (encoded by the MED22 alias SURF5) is a small hydrophilic protein of 140 amino acids; subcellular fractionation located it to the soluble fraction of the cytoplasm.","method":"Subcellular fractionation of mouse cells","journal":"Genomics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single method (fractionation), no functional consequence established; note this is a characterization of the protein product at the SURF5/MED22 locus before its Mediator identity was known","pmids":["8586415"],"is_preprint":false},{"year":2024,"finding":"MED22 shows coordinated temporal activity with SOX2, OCT4, and BRD4 at the Nanog locus in living mouse embryonic stem cells; MED22 clusters are present near the Nanog locus during transcriptional priming and termination phases, consistent with a role in transcriptional re-initiation.","method":"Trimodal single-molecule live-cell imaging (STREAMING-tag) measuring SOX2 mobility, Nanog locus diffusion, and real-time mRNA synthesis in mouse ES cells","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, descriptive localization observation without direct functional perturbation of MED22 itself","pmids":[],"is_preprint":true}],"current_model":"MED22 (SRB6/SURF5) is an essential, conserved subunit of the Mediator head module that functions as part of the RNA polymerase II holoenzyme: it physically interacts with other head module subunits (Med11, Med17) and with Srb4/Med14 to facilitate recruitment of the general transcription factors TFIIH and TFIIE and Pol II itself to the preinitiation complex, thereby supporting both basal and activated transcription as well as CTD phosphorylation; in higher eukaryotes it can be recruited to promoters by cell-type-specific co-activator complexes (e.g., tMAC in Drosophila spermatocytes), and its loss in mammalian podocytes causes progressive glomerular disease, demonstrating an indispensable role in maintaining transcriptional homeostasis in differentiated cells."},"narrative":{"mechanistic_narrative":"MED22 (SRB6/SURF5) is an essential, conserved subunit of the Mediator head module that couples gene-specific and general transcriptional machinery to RNA polymerase II [PMID:8324825, PMID:8187178, PMID:23123849]. It was first identified genetically as a suppressor of CTD truncation mutations and biochemically as part of an SRB-TBP complex tightly bound to Pol II that binds the CTD and is required for transcription of most class II genes [PMID:8324825, PMID:9671455]. Within Mediator, MED22 contributes to activated transcription, enhances TFIIH-dependent CTD phosphorylation, and resides in the head module where its functionally important interaction with Med11 drives recruitment of TFIIH, TFIIE, and Pol II to the preinitiation complex and supports CTD serine 5 phosphorylation [PMID:8187178, PMID:18691966]. Crystallography of the fission yeast head module places MED22 within a conserved architecture whose elements contact the rest of Mediator [PMID:23123849]. Its requirement is gene-selective rather than universal: a subset of yeast genes is transcribed independently of SRB6, indicating parallel activation pathways [PMID:9620805]. In metazoans MED22 is recruited by cell-type-specific co-activators — it binds the tMAC component Topi and, with bromodomain proteins, drives the spermatocyte transcriptional program required for meiosis and male fertility in Drosophila [PMID:26624996, PMID:28235844] — and its podocyte-specific loss in mice causes progressive glomerular disease and renal failure, establishing an indispensable role in transcriptional homeostasis of differentiated cells [PMID:33208756].","teleology":[{"year":1993,"claim":"Established SRB6/MED22 as a CTD-linked transcription factor by showing it suppresses CTD truncation defects and co-purifies with Pol II in a CTD-binding SRB-TBP complex.","evidence":"Genetic suppressor screen, biochemical co-purification, CTD-binding and in vitro transcription assays in yeast","pmids":["8324825"],"confidence":"High","gaps":["Did not define MED22's position within a discrete complex","No direct binding partners within the complex identified"]},{"year":1994,"claim":"Placed MED22 as a subunit of the ~20-protein Mediator complex that enables activated transcription and enhances CTD phosphorylation, defining its functional context.","evidence":"Mediator purification, reconstituted in vitro transcription with homogeneous factors, immunological identification in yeast","pmids":["8187178"],"confidence":"High","gaps":["Direct interaction partners within Mediator not resolved","Architectural placement within the complex unknown"]},{"year":1998,"claim":"Defined MED22 as essential for transcription of most class II genes and placed it in the Srb4 functional pathway, while a parallel study showed certain genes are transcribed independently of SRB6, revealing distinct activation routes.","evidence":"Dominant/dosage suppressor genetics with srb4-ts, physical interaction assays, and ts-srb6 mutant analysis with targeted protein destruction in vivo","pmids":["9671455","9620805"],"confidence":"Medium","gaps":["Molecular basis of the Srb4-Srb6 interaction not structurally defined","Features distinguishing Srb6-dependent from independent genes unknown"]},{"year":2003,"claim":"Demonstrated conservation by identifying a mammalian MED22 orthologue as a bona fide Mediator subunit and mapping its direct pairwise binding partners, extending the architectural model to mammals.","evidence":"Tandem MS of purified rat liver Mediator plus direct pairwise binding assays","pmids":["12584197"],"confidence":"Medium","gaps":["Functional consequences of the mammalian interactions not tested","No in vivo phenotype established at this stage"]},{"year":2008,"claim":"Resolved MED22's mechanistic role by showing the Med11-Med22 head-module interaction drives genome-wide recruitment of TFIIH, TFIIE, and Pol II and supports CTD Ser5 phosphorylation.","evidence":"Interaction-impairing yeast mutants, ChIP-on-chip promoter occupancy, CTD phosphorylation assays","pmids":["18691966"],"confidence":"High","gaps":["Structural basis of differential GTF recruitment not defined","Whether this mechanism operates identically in metazoans untested"]},{"year":2012,"claim":"Provided the structural placement of MED22 within the conserved head module and validated functional elements required for transcription.","evidence":"X-ray crystallography of S. pombe head module at 3.4 Å with in vitro transcription validation","pmids":["23123849"],"confidence":"High","gaps":["MED22-specific contacts with GTFs not visualized in the structure","Conformational dynamics during PIC assembly unresolved"]},{"year":2017,"claim":"Showed metazoan MED22 is recruited by a tissue-specific co-activator (tMAC component Topi) and, with bromodomain proteins, drives a spermatocyte gene program essential for meiosis and fertility.","evidence":"Co-IP in S2 cells, Drosophila germline loss-of-function genetics, comparative microarray epistasis (med22, aly, sa, tBRD mutants)","pmids":["26624996","28235844"],"confidence":"Medium","gaps":["Topi-Med22 interaction shown by single Co-IP without reciprocal/structural validation","Direct versus indirect target gene effects not separated"]},{"year":2020,"claim":"Established MED22's indispensable role in maintaining the transcriptional homeostasis of a differentiated mammalian cell type rather than in its initial differentiation.","evidence":"Podocyte-specific conditional Med22 knockout mouse with histology, ultrastructure, and survival analysis","pmids":["33208756"],"confidence":"Medium","gaps":["Which podocyte target genes fail upon Med22 loss not identified","Mechanism linking transcriptional loss to vacuole formation unknown"]},{"year":2022,"claim":"Revealed that MED22 clusters localize near a target promoter independent of active transcription, distinguishing its behavior from Pol II and BRD4.","evidence":"STREAMING-tag live-cell single-molecule imaging at the Nanog locus in mouse ES cells","pmids":["36539402"],"confidence":"Medium","gaps":["Functional consequence of transcription-independent localization untested","Whether other Mediator subunits behave similarly unknown"]},{"year":null,"claim":"How MED22 head-module recruitment is dynamically coordinated with co-activators across transcriptional cycles, and how its loss translates to tissue-specific disease, remains open.","evidence":"No direct functional perturbation resolving these questions in the timeline","pmids":[],"confidence":"Low","gaps":["No human Mendelian disease link via direct evidence in the corpus","Mechanism of transcription-independent promoter residence undefined","Tissue-specific target gene dependencies uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,5]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,6]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,5]}],"complexes":["Mediator complex","Mediator head module","RNA polymerase II holoenzyme"],"partners":["MED11","MED17","MED14","TOPI"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15528","full_name":"Mediator of RNA polymerase II transcription subunit 22","aliases":["Mediator complex subunit 22","Surfeit locus protein 5","Surf-5"],"length_aa":200,"mass_kda":22.2,"function":"Component of the Mediator complex, a coactivator involved in the regulated transcription of nearly all RNA polymerase II-dependent genes. Mediator functions as a bridge to convey information from gene-specific regulatory proteins to the basal RNA polymerase II transcription machinery. Mediator is recruited to promoters by direct interactions with regulatory proteins and serves as a scaffold for the assembly of a functional preinitiation complex with RNA polymerase II and the general transcription factors","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q15528/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/MED22","classification":"Common Essential","n_dependent_lines":1192,"n_total_lines":1208,"dependency_fraction":0.9867549668874173},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000148297","cell_line_id":"CID000251","localizations":[{"compartment":"nuclear_punctae","grade":3},{"compartment":"nucleoplasm","grade":3}],"interactors":[{"gene":"MED10","stoichiometry":10.0},{"gene":"MED11","stoichiometry":10.0},{"gene":"MED14","stoichiometry":10.0},{"gene":"MED19","stoichiometry":10.0},{"gene":"MED20","stoichiometry":10.0},{"gene":"MED21","stoichiometry":10.0},{"gene":"IXL;MED29","stoichiometry":10.0},{"gene":"MED17","stoichiometry":10.0},{"gene":"MED28","stoichiometry":10.0},{"gene":"MED30","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000251","total_profiled":1310},"omim":[{"mim_id":"620327","title":"NEURODEGENERATION WITH DEVELOPMENTAL DELAY, EARLY RESPIRATORY FAILURE, MYOCLONIC SEIZURES, AND BRAIN ABNORMALITIES; NDDRSB","url":"https://www.omim.org/entry/620327"},{"mim_id":"612383","title":"MEDIATOR COMPLEX SUBUNIT 11; MED11","url":"https://www.omim.org/entry/612383"},{"mim_id":"185642","title":"SURFEIT 6; SURF6","url":"https://www.omim.org/entry/185642"},{"mim_id":"185641","title":"MEDIATOR COMPLEX SUBUNIT 22; MED22","url":"https://www.omim.org/entry/185641"},{"mim_id":"185640","title":"RIBOSOMAL PROTEIN L7a; RPL7A","url":"https://www.omim.org/entry/185640"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MED22"},"hgnc":{"alias_symbol":["Med24","SRB6"],"prev_symbol":["SURF5"]},"alphafold":{"accession":"Q15528","domains":[{"cath_id":"1.20.58","chopping":"9-41_51-155","consensus_level":"medium","plddt":89.9456,"start":9,"end":155}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15528","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15528-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15528-F1-predicted_aligned_error_v6.png","plddt_mean":78.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MED22","jax_strain_url":"https://www.jax.org/strain/search?query=MED22"},"sequence":{"accession":"Q15528","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15528.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15528/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15528"}},"corpus_meta":[{"pmid":"8187178","id":"PMC_8187178","title":"A multiprotein 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truncation mutations, placing it functionally in CTD-dependent transcription.\",\n      \"method\": \"Genetic suppressor screen (extragenic suppressors of CTD truncation mutants), biochemical co-purification, CTD-binding assay, in vitro transcription\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic epistasis combined with biochemical co-purification and in vitro transcription assays, replicated across multiple experiments in the same study\",\n      \"pmids\": [\"8324825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"SRB6 (MED22) is one of ~20 polypeptides comprising the yeast Mediator complex; Mediator enables activated transcription, confers greater basal transcription activity, and enhances CTD phosphorylation by TFIIH-associated CTD kinase, indicating a Mediator-CTD interaction. SRB6 was identified as a cross-reactive component of the holoenzyme form of RNA polymerase II.\",\n      \"method\": \"Biochemical purification of Mediator from yeast, reconstituted in vitro transcription with homogeneous factors, immunological identification with antisera against SRB6\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro transcription system with homogeneous factors, multiple orthogonal methods (purification, immunoreactivity, transcription assay)\",\n      \"pmids\": [\"8187178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SRB6 (MED22) is an essential component of the RNA polymerase II holoenzyme required for transcription of most class II genes; it physically interacts with Srb4, and dominant mutations in SRB6 suppress a temperature-sensitive srb4 mutation, placing SRB6 in the same functional pathway as Srb4 in transcription activation.\",\n      \"method\": \"Dominant suppressor genetics (dosage suppression of srb4-ts), physical interaction assay (genetic and biochemical evidence of interaction with Srb4)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis and physical interaction data, single lab, two complementary approaches\",\n      \"pmids\": [\"9671455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Transcription of certain genes in yeast is independent of Srb4 and Srb6 (MED22), demonstrating that the Mediator/CTD-associated pathway is not universally required and that at least two distinct transcriptional activation pathways exist in vivo.\",\n      \"method\": \"Temperature-sensitive srb6 mutant analysis combined with copper-inducible targeted protein destruction, gene-specific transcription assays in vivo\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with defined transcriptional phenotype, single lab but multiple gene targets tested\",\n      \"pmids\": [\"9620805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A mammalian homologue of yeast Srb6 (now MED22) was identified as a bona fide subunit of the mammalian Mediator complex purified from rat liver nuclei; direct pairwise binding partners of MED22 among known mammalian Mediator subunits were identified, contributing to the architectural model of mammalian Mediator.\",\n      \"method\": \"Tandem mass spectrometry of purified mammalian Mediator fractions, direct pairwise binding assays among Mediator subunits\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS identification from purified complex plus direct binding assays, single lab\",\n      \"pmids\": [\"12584197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Med22 (MED22) is a subunit of the Mediator head module; interactions between Med11 and Med22 within the head module are functionally important for recruitment of TFIIH, TFIIE, and RNA Pol II to the preinitiation complex (PIC). Impairing the Med11-Med22 interaction differentially affects occupancy of these general transcription factors at promoters genome-wide, and reduces Pol II CTD serine 5 phosphorylation.\",\n      \"method\": \"Yeast genetics (mutant alleles impairing specific protein-protein interactions), ChIP-on-chip genome-wide promoter occupancy assays, Pol II CTD phosphorylation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP combined with interaction genetics and phosphorylation assay, multiple orthogonal methods, defined mechanistic pathway\",\n      \"pmids\": [\"18691966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Med22 (MED22) is a conserved subunit of the Mediator head module. Crystal structure of the S. pombe head module at 3.4 Å resolution places Med22 within the head module architecture; the structure reveals high conservation and flexibility, and functional elements including the 'shoulder' contact other parts of Mediator. The joint element of the head module is required for transcription in vitro.\",\n      \"method\": \"X-ray crystallography of fission yeast Mediator head module at 3.4 Å; in vitro transcription assay validating the joint element\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure at near-atomic resolution with functional in vitro transcription validation, rigorous structural study\",\n      \"pmids\": [\"23123849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Drosophila Med22 (MED22) is required for activation of hundreds of new transcripts in the spermatocyte transcriptional program. Med22 binds the testis meiotic arrest complex (tMAC) component Topi when co-expressed in S2 cells, suggesting direct recruitment of Mediator by tMAC. Loss of Med22 function in spermatocytes causes meiosis I maturation arrest and male infertility.\",\n      \"method\": \"Co-immunoprecipitation (Med22 binding to Topi in S2 cells), loss-of-function genetics in Drosophila male germline with fertility and meiosis phenotypic readout, microarray/transcriptomic validation of target genes\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP binding assay plus in vivo loss-of-function with defined cellular phenotype, single lab\",\n      \"pmids\": [\"26624996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Drosophila Med22 (MED22) and the bromodomain proteins tBRD-1 and tBRD-2 co-regulate expression of a defined set of genes in primary spermatocytes required for spermatid differentiation, placing Med22 in a sequential regulatory hierarchy involving tMAC, Mediator, and tTAFs.\",\n      \"method\": \"Microarray comparison of mutant gene expression profiles (med22, aly, sa, tBRD-1, tBRD-2 mutants), genetic epistasis analysis\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via comparative transcriptomics, multiple mutants compared, single lab\",\n      \"pmids\": [\"28235844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Podocyte-specific knockout of Med22 (MED22) in mice does not impair normal podocyte maturation but is critical for maintaining podocyte health; loss of Med22 leads to intracellular vacuole formation, progressive podocyte loss, glomerular disease, and premature death from renal failure, demonstrating an essential role for Mediator complex in kidney podocyte physiology.\",\n      \"method\": \"Conditional (podocyte-specific) Med22 knockout mouse, histological and ultrastructural morphological analyses, survival analysis with defined renal failure phenotype\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean tissue-specific KO with defined cellular and organismal phenotype, single lab, rigorous morphological characterization\",\n      \"pmids\": [\"33208756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MED22 protein clusters tend to localize near the transcription start site of the Nanog gene in mouse embryonic stem cells even in the absence of transcriptional activity, in contrast to RNA Pol II and BRD4 clusters which are enriched proximal to the TSS only when the gene is being transcribed. This was determined using the STREAMING-tag live-cell imaging system.\",\n      \"method\": \"Live-cell single-molecule/cluster imaging (STREAMING-tag system combining MS2, TetO repeats, and intein-based reporter) in mouse embryonic stem cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live-cell localization experiment with functional (transcriptional activity) correlation, single lab, novel system\",\n      \"pmids\": [\"36539402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The mouse Surf5 protein (encoded by the MED22 alias SURF5) is a small hydrophilic protein of 140 amino acids; subcellular fractionation located it to the soluble fraction of the cytoplasm.\",\n      \"method\": \"Subcellular fractionation of mouse cells\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single method (fractionation), no functional consequence established; note this is a characterization of the protein product at the SURF5/MED22 locus before its Mediator identity was known\",\n      \"pmids\": [\"8586415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MED22 shows coordinated temporal activity with SOX2, OCT4, and BRD4 at the Nanog locus in living mouse embryonic stem cells; MED22 clusters are present near the Nanog locus during transcriptional priming and termination phases, consistent with a role in transcriptional re-initiation.\",\n      \"method\": \"Trimodal single-molecule live-cell imaging (STREAMING-tag) measuring SOX2 mobility, Nanog locus diffusion, and real-time mRNA synthesis in mouse ES cells\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, descriptive localization observation without direct functional perturbation of MED22 itself\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"MED22 (SRB6/SURF5) is an essential, conserved subunit of the Mediator head module that functions as part of the RNA polymerase II holoenzyme: it physically interacts with other head module subunits (Med11, Med17) and with Srb4/Med14 to facilitate recruitment of the general transcription factors TFIIH and TFIIE and Pol II itself to the preinitiation complex, thereby supporting both basal and activated transcription as well as CTD phosphorylation; in higher eukaryotes it can be recruited to promoters by cell-type-specific co-activator complexes (e.g., tMAC in Drosophila spermatocytes), and its loss in mammalian podocytes causes progressive glomerular disease, demonstrating an indispensable role in maintaining transcriptional homeostasis in differentiated cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MED22 (SRB6/SURF5) is an essential, conserved subunit of the Mediator head module that couples gene-specific and general transcriptional machinery to RNA polymerase II [#0, #1, #6]. It was first identified genetically as a suppressor of CTD truncation mutations and biochemically as part of an SRB-TBP complex tightly bound to Pol II that binds the CTD and is required for transcription of most class II genes [#0, #2]. Within Mediator, MED22 contributes to activated transcription, enhances TFIIH-dependent CTD phosphorylation, and resides in the head module where its functionally important interaction with Med11 drives recruitment of TFIIH, TFIIE, and Pol II to the preinitiation complex and supports CTD serine 5 phosphorylation [#1, #5]. Crystallography of the fission yeast head module places MED22 within a conserved architecture whose elements contact the rest of Mediator [#6]. Its requirement is gene-selective rather than universal: a subset of yeast genes is transcribed independently of SRB6, indicating parallel activation pathways [#3]. In metazoans MED22 is recruited by cell-type-specific co-activators \\u2014 it binds the tMAC component Topi and, with bromodomain proteins, drives the spermatocyte transcriptional program required for meiosis and male fertility in Drosophila [#7, #8] \\u2014 and its podocyte-specific loss in mice causes progressive glomerular disease and renal failure, establishing an indispensable role in transcriptional homeostasis of differentiated cells [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established SRB6/MED22 as a CTD-linked transcription factor by showing it suppresses CTD truncation defects and co-purifies with Pol II in a CTD-binding SRB-TBP complex.\",\n      \"evidence\": \"Genetic suppressor screen, biochemical co-purification, CTD-binding and in vitro transcription assays in yeast\",\n      \"pmids\": [\"8324825\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define MED22's position within a discrete complex\", \"No direct binding partners within the complex identified\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Placed MED22 as a subunit of the ~20-protein Mediator complex that enables activated transcription and enhances CTD phosphorylation, defining its functional context.\",\n      \"evidence\": \"Mediator purification, reconstituted in vitro transcription with homogeneous factors, immunological identification in yeast\",\n      \"pmids\": [\"8187178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct interaction partners within Mediator not resolved\", \"Architectural placement within the complex unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined MED22 as essential for transcription of most class II genes and placed it in the Srb4 functional pathway, while a parallel study showed certain genes are transcribed independently of SRB6, revealing distinct activation routes.\",\n      \"evidence\": \"Dominant/dosage suppressor genetics with srb4-ts, physical interaction assays, and ts-srb6 mutant analysis with targeted protein destruction in vivo\",\n      \"pmids\": [\"9671455\", \"9620805\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the Srb4-Srb6 interaction not structurally defined\", \"Features distinguishing Srb6-dependent from independent genes unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated conservation by identifying a mammalian MED22 orthologue as a bona fide Mediator subunit and mapping its direct pairwise binding partners, extending the architectural model to mammals.\",\n      \"evidence\": \"Tandem MS of purified rat liver Mediator plus direct pairwise binding assays\",\n      \"pmids\": [\"12584197\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequences of the mammalian interactions not tested\", \"No in vivo phenotype established at this stage\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved MED22's mechanistic role by showing the Med11-Med22 head-module interaction drives genome-wide recruitment of TFIIH, TFIIE, and Pol II and supports CTD Ser5 phosphorylation.\",\n      \"evidence\": \"Interaction-impairing yeast mutants, ChIP-on-chip promoter occupancy, CTD phosphorylation assays\",\n      \"pmids\": [\"18691966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of differential GTF recruitment not defined\", \"Whether this mechanism operates identically in metazoans untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided the structural placement of MED22 within the conserved head module and validated functional elements required for transcription.\",\n      \"evidence\": \"X-ray crystallography of S. pombe head module at 3.4 \\u00c5 with in vitro transcription validation\",\n      \"pmids\": [\"23123849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MED22-specific contacts with GTFs not visualized in the structure\", \"Conformational dynamics during PIC assembly unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed metazoan MED22 is recruited by a tissue-specific co-activator (tMAC component Topi) and, with bromodomain proteins, drives a spermatocyte gene program essential for meiosis and fertility.\",\n      \"evidence\": \"Co-IP in S2 cells, Drosophila germline loss-of-function genetics, comparative microarray epistasis (med22, aly, sa, tBRD mutants)\",\n      \"pmids\": [\"26624996\", \"28235844\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Topi-Med22 interaction shown by single Co-IP without reciprocal/structural validation\", \"Direct versus indirect target gene effects not separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established MED22's indispensable role in maintaining the transcriptional homeostasis of a differentiated mammalian cell type rather than in its initial differentiation.\",\n      \"evidence\": \"Podocyte-specific conditional Med22 knockout mouse with histology, ultrastructure, and survival analysis\",\n      \"pmids\": [\"33208756\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which podocyte target genes fail upon Med22 loss not identified\", \"Mechanism linking transcriptional loss to vacuole formation unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed that MED22 clusters localize near a target promoter independent of active transcription, distinguishing its behavior from Pol II and BRD4.\",\n      \"evidence\": \"STREAMING-tag live-cell single-molecule imaging at the Nanog locus in mouse ES cells\",\n      \"pmids\": [\"36539402\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of transcription-independent localization untested\", \"Whether other Mediator subunits behave similarly unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MED22 head-module recruitment is dynamically coordinated with co-activators across transcriptional cycles, and how its loss translates to tissue-specific disease, remains open.\",\n      \"evidence\": \"No direct functional perturbation resolving these questions in the timeline\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No human Mendelian disease link via direct evidence in the corpus\", \"Mechanism of transcription-independent promoter residence undefined\", \"Tissue-specific target gene dependencies uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 5]}\n    ],\n    \"complexes\": [\"Mediator complex\", \"Mediator head module\", \"RNA polymerase II holoenzyme\"],\n    \"partners\": [\"MED11\", \"MED17\", \"MED14\", \"Topi\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}