{"gene":"GEMIN7","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2002,"finding":"Gemin7 was identified as a novel component of the SMN complex. Direct binding experiments showed Gemin7 interacts directly with SMN via arginine-glycine (RG) repeats in Gemin7, and directly with Gemin6, mediating the association of Gemin6 with the SMN complex. Gemin7 also interacts with several Sm proteins, particularly SmE.","method":"Co-immunoprecipitation, immunolocalization, direct binding/pull-down experiments, mass spectrometry peptide sequencing","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus direct binding experiments replicated in subsequent studies; founding paper with multiple orthogonal methods","pmids":["12065586"],"is_preprint":false},{"year":2005,"finding":"Crystal structure of the Gemin6-Gemin7 heterodimer revealed that both proteins adopt canonical Sm folds despite no significant sequence similarity to Sm proteins, and they interact with each other via an interface similar to Sm protein-Sm protein interactions. The Gemin6/Gemin7 complex also binds to Sm proteins in vitro.","method":"X-ray crystallography, in vitro binding experiments","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus in vitro binding, rigorously established structural and interaction basis","pmids":["15939020"],"is_preprint":false},{"year":2005,"finding":"Unrip is recruited to the SMN complex via a stable direct interaction with Gemin7. This interaction is mutually exclusive with the unrip-unr complex. RNAi reduction of unrip leads to enhanced nuclear accumulation of SMN (increased gems/Cajal bodies), implicating unrip-Gemin7 interaction in cytoplasmic retention of the SMN complex.","method":"Co-immunoprecipitation, RNAi knockdown, immunofluorescence microscopy","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP combined with RNAi functional assay and localization, replicated independently (PMID:15848170)","pmids":["16159890","15848170"],"is_preprint":false},{"year":2005,"finding":"Unrip interacts directly with Gemin6 and Gemin7 within the SMN complex, and unrip-containing SMN complexes are necessary and sufficient to mediate spliceosomal snRNP assembly in vitro.","method":"Co-immunoprecipitation, in vitro snRNP assembly assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding and functional assembly assay in single lab, consistent with independent replication in PMID:16159890","pmids":["15848170"],"is_preprint":false},{"year":2006,"finding":"A comprehensive interaction map of the SMN complex showed that SMN, Gemin8, and Gemin7 form the central building block of the complex, onto which other components are assembled via multiple interactions. The SMN complex was reconstituted from individual components in vitro, confirming the central role of Gemin7.","method":"In vivo and in vitro binding assays, reconstitution of SMN complex from individual components","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution from individual components plus multiple binding assays establishing central architectural role","pmids":["17178713"],"is_preprint":false},{"year":2006,"finding":"Gemin6, Gemin7, and Unrip form a stable cytoplasmic subcomplex. Gemin8 binds directly to SMN and mediates the interaction of SMN with the Gemin6/Gemin7 heterodimer. Knockdown of Gemin8 disrupts the association of Gemin6, Gemin7, and Unrip with SMN, impairing snRNP assembly by reducing SMN complex association with Sm proteins but not snRNAs.","method":"RNA interference, co-immunoprecipitation, in vitro snRNP assembly assay, monoclonal antibody characterization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi loss-of-function with defined molecular phenotype, reciprocal co-IP, and functional snRNP assembly assay, replicated across two papers (PMID:16434402, PMID:17023415)","pmids":["17023415","16434402"],"is_preprint":false},{"year":2007,"finding":"Gemin6, Gemin7, and Unrip form a stable SMN-independent subcomplex (sedimentation experiments reveal a distinct Gemin6-Gemin7-unrip complex). This subunit persists at similar levels when SMN is reduced, indicating structural autonomy from SMN.","method":"Sedimentation analysis, immunoprecipitation of cell extracts","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — sedimentation plus immunoprecipitation, single lab, consistent with prior interaction data","pmids":["17640873"],"is_preprint":false},{"year":2009,"finding":"A Gemin2-Gemin7 interaction was identified, and the SMN-Gemin7 interaction is stabilized in the presence of Gemin2. Gemin7 knockdown decreased snRNP assembly activity and reduced SmE protein in the SMN complex. Unrip, but not Gemin8, can remove Gemin7 from the stable SMN-Gemin2-Gemin7 ternary complex. In an in vitro snRNP assembly assay, the Gemin6-Gemin7 heterodimer is exchanged by the SmD3-SmB particle during snRNP formation, and this exchange requires Unrip.","method":"Mammalian two-hybrid assay, in vitro stability assay, RNAi knockdown, in vitro snRNP assembly assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple assays in single lab including in vitro reconstitution and knockdown with defined molecular readout","pmids":["19321448"],"is_preprint":false},{"year":2005,"finding":"Gemin7 was detected in neurite-like cytoplasmic extensions and growth cones of differentiating rat PC12 cells, as part of SMN complexes, consistent with a role in axonal transport of mRNPs.","method":"Immunofluorescence co-localization in differentiating PC12 cells","journal":"Experimental cell research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single localization experiment, no direct functional manipulation of Gemin7 specifically","pmids":["15975577"],"is_preprint":false},{"year":2010,"finding":"Live cell imaging of GFP-Gemin7 in neuronal cells showed that Gemin7 localizes to two distinct subsets of neurite granules: stationary bodies and smaller dynamic transport bodies, indicating Gemin7-containing SMN sub-complexes are present in axonal transport granules.","method":"Live cell imaging of GFP-tagged Gemin7 in neurite granules","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single localization experiment without direct functional manipulation of Gemin7","pmids":["20188701"],"is_preprint":false},{"year":2017,"finding":"In Drosophila, a Gemin6/7/Unrip module (with homologues of human Gemin6 and Gemin7) can be recruited to the SMN complex via the SMN-associated Gemin8 orthologue, mirroring the human SMN complex architecture.","method":"In vivo interaction assays in Drosophila","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo interaction in Drosophila model organism consistent with human complex architecture; supports conservation of Gemin7 module recruitment mechanism","pmids":["28949413"],"is_preprint":false}],"current_model":"Gemin7 is a core structural component of the SMN complex that adopts an Sm-like fold, forms a heterodimer with Gemin6 via Sm-protein-like interfaces, interacts directly with SMN through its RG repeats, recruits Gemin6 and Unrip into the complex, participates as a central node (together with SMN and Gemin8) in assembling the full SMN complex, and functions as a transient surrogate for the SmD3-SmB particle during snRNP biogenesis before being displaced by the Sm proteins in a Unrip-dependent step."},"narrative":{"mechanistic_narrative":"GEMIN7 is a core structural subunit of the SMN complex, the cytoplasmic machinery that assembles spliceosomal snRNPs [PMID:12065586, PMID:17178713]. It binds SMN directly through its arginine-glycine (RG) repeats and recruits Gemin6 into the complex, while also contacting Sm proteins, particularly SmE [PMID:12065586]. Crystallographic analysis shows GEMIN7 adopts a canonical Sm fold despite lacking Sm sequence similarity and forms a heterodimer with Gemin6 through an Sm-protein-like interface [PMID:15939020]. Together with SMN and Gemin8, GEMIN7 constitutes the central architectural building block onto which the rest of the complex assembles, as demonstrated by in vitro reconstitution from individual components [PMID:17178713]; Gemin8 bridges SMN to the Gemin6/Gemin7 heterodimer, and its loss strips Gemin6, GEMIN7, and Unrip from SMN and impairs snRNP assembly [PMID:17023415, PMID:16434402]. GEMIN7 additionally recruits Unrip via a stable direct interaction that is linked to cytoplasmic retention of the complex [PMID:16159890, PMID:15848170], and Gemin6/Gemin7/Unrip exist as a stable SMN-independent cytoplasmic subcomplex [PMID:17640873]. Functionally, the Gemin6–Gemin7 heterodimer acts as a transient surrogate for the SmD3–SmB particle during snRNP formation and is exchanged out for the authentic Sm proteins in an Unrip-dependent step [PMID:19321448]. This module architecture and its recruitment via Gemin8 are conserved in Drosophila [PMID:28949413].","teleology":[{"year":2002,"claim":"Established GEMIN7 as a bona fide SMN complex member and defined its direct binding partners, answering whether it is a peripheral or integral component.","evidence":"Co-IP, immunolocalization, direct pull-down and mass spectrometry identifying SMN (via RG repeats), Gemin6, and Sm protein (SmE) contacts","pmids":["12065586"],"confidence":"High","gaps":["No structural basis for the interactions","Functional role in snRNP assembly not yet tested"]},{"year":2005,"claim":"Solved how GEMIN7 and Gemin6 dimerize, revealing they mimic Sm proteins structurally and explaining their ability to bind Sm proteins.","evidence":"X-ray crystallography of the Gemin6-Gemin7 heterodimer plus in vitro Sm-protein binding","pmids":["15939020"],"confidence":"High","gaps":["Did not establish whether the Sm-like fold serves a surrogate function in assembly","No structure within the full SMN complex"]},{"year":2005,"claim":"Identified GEMIN7 as the recruiter of Unrip into the SMN complex and linked this interaction to subcellular localization control.","evidence":"Reciprocal co-IP, RNAi knockdown of Unrip, and immunofluorescence showing altered nuclear SMN accumulation","pmids":["16159890","15848170"],"confidence":"High","gaps":["Mechanism of cytoplasmic retention not resolved","Direct contribution of GEMIN7 (vs Unrip) to localization untested"]},{"year":2006,"claim":"Placed GEMIN7 within the central architectural core of the SMN complex by reconstituting the complex from purified parts.","evidence":"In vivo/in vitro binding assays and full reconstitution from individual components","pmids":["17178713"],"confidence":"High","gaps":["Did not define GEMIN7's catalytic or surrogate role in assembly","Stoichiometry within reconstituted complex not detailed"]},{"year":2006,"claim":"Defined the Gemin8-dependent route by which the Gemin6/Gemin7/Unrip module joins SMN and showed this matters for snRNP assembly.","evidence":"RNAi of Gemin8, co-IP, and in vitro snRNP assembly assay showing reduced Sm protein (not snRNA) association upon disruption","pmids":["17023415","16434402"],"confidence":"High","gaps":["Did not isolate GEMIN7's specific contribution from the module","Step in assembly affected not pinpointed"]},{"year":2007,"claim":"Demonstrated that the Gemin6/Gemin7/Unrip subcomplex is structurally autonomous from SMN, establishing it as a pre-formed module.","evidence":"Sedimentation analysis and immunoprecipitation showing persistence of the subcomplex upon SMN reduction","pmids":["17640873"],"confidence":"Medium","gaps":["Single-lab sedimentation evidence","Functional purpose of the autonomous subcomplex untested"]},{"year":2009,"claim":"Revealed the mechanistic role of GEMIN7 as a transient Sm-protein surrogate that is displaced during snRNP maturation, clarifying why it adopts an Sm fold.","evidence":"Mammalian two-hybrid (Gemin2 interaction), in vitro stability/exchange assays, RNAi knockdown reducing assembly and SmE levels, and in vitro snRNP assembly showing Unrip-dependent exchange of the Gemin6-Gemin7 heterodimer for the SmD3-SmB particle","pmids":["19321448"],"confidence":"Medium","gaps":["Single-lab in vitro reconstitution","Structural snapshot of the exchange step lacking","Trigger and timing of Unrip-dependent displacement unresolved"]},{"year":2017,"claim":"Showed evolutionary conservation of the Gemin6/7/Unrip module recruitment via Gemin8, generalizing the human assembly mechanism.","evidence":"In vivo interaction assays in Drosophila with Gemin6/Gemin7/Unrip homologues","pmids":["28949413"],"confidence":"Medium","gaps":["Did not test functional consequences in the organism","Surrogate-exchange role not examined in Drosophila"]},{"year":null,"claim":"How GEMIN7's neuronal/axonal granule localization relates to its snRNP-assembly role, and whether it has SMN-complex-independent functions, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["Neurite granule localization (idx 8, 9) rests on imaging without functional manipulation of GEMIN7","No structure of GEMIN7 within the full assembling complex","Direct trigger of the Unrip-dependent surrogate exchange unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,5]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,4]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,6]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[3,5,7]}],"complexes":["SMN complex","Gemin6-Gemin7-Unrip subcomplex"],"partners":["SMN","GEMIN6","GEMIN8","GEMIN2","UNRIP","SME","SMD3","SMB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H840","full_name":"Gem-associated protein 7","aliases":["SIP3"],"length_aa":131,"mass_kda":14.5,"function":"The SMN complex catalyzes the assembly of small nuclear ribonucleoproteins (snRNPs), the building blocks of the spliceosome, and thereby plays an important role in the splicing of cellular pre-mRNAs. Most spliceosomal snRNPs contain a common set of Sm proteins SNRPB, SNRPD1, SNRPD2, SNRPD3, SNRPE, SNRPF and SNRPG that assemble in a heptameric protein ring on the Sm site of the small nuclear RNA to form the core snRNP (Sm core). In the cytosol, the Sm proteins SNRPD1, SNRPD2, SNRPE, SNRPF and SNRPG are trapped in an inactive 6S pICln-Sm complex by the chaperone CLNS1A that controls the assembly of the core snRNP. To assemble core snRNPs, the SMN complex accepts the trapped 5Sm proteins from CLNS1A forming an intermediate. Binding of snRNA inside 5Sm triggers eviction of the SMN complex, thereby allowing binding of SNRPD3 and SNRPB to complete assembly of the core snRNP","subcellular_location":"Nucleus, nucleoplasm; Nucleus, gem; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9H840/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/GEMIN7","classification":"Common Essential","n_dependent_lines":1041,"n_total_lines":1208,"dependency_fraction":0.8617549668874173},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GEMIN7","total_profiled":1310},"omim":[{"mim_id":"607419","title":"GEM NUCLEAR ORGANELLE-ASSOCIATED PROTEIN 7; GEMIN7","url":"https://www.omim.org/entry/607419"},{"mim_id":"607006","title":"GEM NUCLEAR ORGANELLE-ASSOCIATED PROTEIN 6; GEMIN6","url":"https://www.omim.org/entry/607006"},{"mim_id":"605986","title":"SERINE/THREONINE KINASE RECEPTOR-ASSOCIATED PROTEIN; STRAP","url":"https://www.omim.org/entry/605986"},{"mim_id":"602595","title":"GEM NUCLEAR ORGANELLE-ASSOCIATED PROTEIN 2; GEMIN2","url":"https://www.omim.org/entry/602595"},{"mim_id":"600354","title":"SURVIVAL OF MOTOR NEURON 1; SMN1","url":"https://www.omim.org/entry/600354"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GEMIN7"},"hgnc":{"alias_symbol":["FLJ13956"],"prev_symbol":[]},"alphafold":{"accession":"Q9H840","domains":[{"cath_id":"2.30.30.100","chopping":"71-130","consensus_level":"high","plddt":97.3928,"start":71,"end":130}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H840","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H840-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H840-F1-predicted_aligned_error_v6.png","plddt_mean":80.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GEMIN7","jax_strain_url":"https://www.jax.org/strain/search?query=GEMIN7"},"sequence":{"accession":"Q9H840","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H840.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H840/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H840"}},"corpus_meta":[{"pmid":"17178713","id":"PMC_17178713","title":"A comprehensive interaction map of the human survival of motor neuron (SMN) complex.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17178713","citation_count":120,"is_preprint":false},{"pmid":"15975577","id":"PMC_15975577","title":"A role for complexes of survival of motor neurons (SMN) protein with gemins and profilin in neurite-like cytoplasmic extensions of cultured nerve cells.","date":"2005","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/15975577","citation_count":111,"is_preprint":false},{"pmid":"12065586","id":"PMC_12065586","title":"Identification and characterization of Gemin7, a novel component of the survival of motor neuron complex.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12065586","citation_count":92,"is_preprint":false},{"pmid":"16434402","id":"PMC_16434402","title":"Gemin8 is a novel component of the survival motor neuron complex and functions in small nuclear ribonucleoprotein assembly.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16434402","citation_count":87,"is_preprint":false},{"pmid":"16159890","id":"PMC_16159890","title":"Unrip, a factor implicated in cap-independent translation, associates with the cytosolic SMN complex and influences its intracellular localization.","date":"2005","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/16159890","citation_count":70,"is_preprint":false},{"pmid":"15848170","id":"PMC_15848170","title":"Unrip is a component of SMN complexes active in snRNP assembly.","date":"2005","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/15848170","citation_count":66,"is_preprint":false},{"pmid":"17640873","id":"PMC_17640873","title":"SMN-independent subunits of the SMN complex. Identification of a small nuclear ribonucleoprotein assembly intermediate.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17640873","citation_count":55,"is_preprint":false},{"pmid":"17023415","id":"PMC_17023415","title":"Gemin8 is required for the architecture and function of the survival motor neuron complex.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17023415","citation_count":49,"is_preprint":false},{"pmid":"15939020","id":"PMC_15939020","title":"The Gemin6-Gemin7 heterodimer from the survival of motor neurons complex has an Sm protein-like structure.","date":"2005","source":"Structure (London, England : 1993)","url":"https://pubmed.ncbi.nlm.nih.gov/15939020","citation_count":43,"is_preprint":false},{"pmid":"14633674","id":"PMC_14633674","title":"The contribution of genetic and epigenetic mechanisms to gene silencing in oligodendrogliomas.","date":"2003","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/14633674","citation_count":36,"is_preprint":false},{"pmid":"20515655","id":"PMC_20515655","title":"Analysis of SMN-neurite granules: Core Cajal body components are absent from SMN-cytoplasmic complexes.","date":"2010","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/20515655","citation_count":24,"is_preprint":false},{"pmid":"19321448","id":"PMC_19321448","title":"Role of survival motor neuron complex components in small nuclear ribonucleoprotein assembly.","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19321448","citation_count":21,"is_preprint":false},{"pmid":"20188701","id":"PMC_20188701","title":"SMN and the Gemin proteins form sub-complexes that localise to both stationary and dynamic neurite granules.","date":"2010","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/20188701","citation_count":20,"is_preprint":false},{"pmid":"28949413","id":"PMC_28949413","title":"Novel interactors of the Drosophila Survival Motor Neuron (SMN) Complex suggest its full conservation.","date":"2017","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/28949413","citation_count":17,"is_preprint":false},{"pmid":"30786668","id":"PMC_30786668","title":"Sporadic amyotrophic lateral sclerosis: is SMN-Gemins protein complex of importance for the relative resistance of oculomotor nucleus motoneurons to degeneration?","date":"2018","source":"Folia neuropathologica","url":"https://pubmed.ncbi.nlm.nih.gov/30786668","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8835,"output_tokens":2553,"usd":0.0324,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9699,"output_tokens":2802,"usd":0.059272,"stage2_stop_reason":"end_turn"},"total_usd":0.091672,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"Gemin7 was identified as a novel component of the SMN complex. Direct binding experiments showed Gemin7 interacts directly with SMN via arginine-glycine (RG) repeats in Gemin7, and directly with Gemin6, mediating the association of Gemin6 with the SMN complex. Gemin7 also interacts with several Sm proteins, particularly SmE.\",\n      \"method\": \"Co-immunoprecipitation, immunolocalization, direct binding/pull-down experiments, mass spectrometry peptide sequencing\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus direct binding experiments replicated in subsequent studies; founding paper with multiple orthogonal methods\",\n      \"pmids\": [\"12065586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structure of the Gemin6-Gemin7 heterodimer revealed that both proteins adopt canonical Sm folds despite no significant sequence similarity to Sm proteins, and they interact with each other via an interface similar to Sm protein-Sm protein interactions. The Gemin6/Gemin7 complex also binds to Sm proteins in vitro.\",\n      \"method\": \"X-ray crystallography, in vitro binding experiments\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus in vitro binding, rigorously established structural and interaction basis\",\n      \"pmids\": [\"15939020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Unrip is recruited to the SMN complex via a stable direct interaction with Gemin7. This interaction is mutually exclusive with the unrip-unr complex. RNAi reduction of unrip leads to enhanced nuclear accumulation of SMN (increased gems/Cajal bodies), implicating unrip-Gemin7 interaction in cytoplasmic retention of the SMN complex.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, immunofluorescence microscopy\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP combined with RNAi functional assay and localization, replicated independently (PMID:15848170)\",\n      \"pmids\": [\"16159890\", \"15848170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Unrip interacts directly with Gemin6 and Gemin7 within the SMN complex, and unrip-containing SMN complexes are necessary and sufficient to mediate spliceosomal snRNP assembly in vitro.\",\n      \"method\": \"Co-immunoprecipitation, in vitro snRNP assembly assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding and functional assembly assay in single lab, consistent with independent replication in PMID:16159890\",\n      \"pmids\": [\"15848170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A comprehensive interaction map of the SMN complex showed that SMN, Gemin8, and Gemin7 form the central building block of the complex, onto which other components are assembled via multiple interactions. The SMN complex was reconstituted from individual components in vitro, confirming the central role of Gemin7.\",\n      \"method\": \"In vivo and in vitro binding assays, reconstitution of SMN complex from individual components\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution from individual components plus multiple binding assays establishing central architectural role\",\n      \"pmids\": [\"17178713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Gemin6, Gemin7, and Unrip form a stable cytoplasmic subcomplex. Gemin8 binds directly to SMN and mediates the interaction of SMN with the Gemin6/Gemin7 heterodimer. Knockdown of Gemin8 disrupts the association of Gemin6, Gemin7, and Unrip with SMN, impairing snRNP assembly by reducing SMN complex association with Sm proteins but not snRNAs.\",\n      \"method\": \"RNA interference, co-immunoprecipitation, in vitro snRNP assembly assay, monoclonal antibody characterization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi loss-of-function with defined molecular phenotype, reciprocal co-IP, and functional snRNP assembly assay, replicated across two papers (PMID:16434402, PMID:17023415)\",\n      \"pmids\": [\"17023415\", \"16434402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Gemin6, Gemin7, and Unrip form a stable SMN-independent subcomplex (sedimentation experiments reveal a distinct Gemin6-Gemin7-unrip complex). This subunit persists at similar levels when SMN is reduced, indicating structural autonomy from SMN.\",\n      \"method\": \"Sedimentation analysis, immunoprecipitation of cell extracts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sedimentation plus immunoprecipitation, single lab, consistent with prior interaction data\",\n      \"pmids\": [\"17640873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A Gemin2-Gemin7 interaction was identified, and the SMN-Gemin7 interaction is stabilized in the presence of Gemin2. Gemin7 knockdown decreased snRNP assembly activity and reduced SmE protein in the SMN complex. Unrip, but not Gemin8, can remove Gemin7 from the stable SMN-Gemin2-Gemin7 ternary complex. In an in vitro snRNP assembly assay, the Gemin6-Gemin7 heterodimer is exchanged by the SmD3-SmB particle during snRNP formation, and this exchange requires Unrip.\",\n      \"method\": \"Mammalian two-hybrid assay, in vitro stability assay, RNAi knockdown, in vitro snRNP assembly assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple assays in single lab including in vitro reconstitution and knockdown with defined molecular readout\",\n      \"pmids\": [\"19321448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Gemin7 was detected in neurite-like cytoplasmic extensions and growth cones of differentiating rat PC12 cells, as part of SMN complexes, consistent with a role in axonal transport of mRNPs.\",\n      \"method\": \"Immunofluorescence co-localization in differentiating PC12 cells\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single localization experiment, no direct functional manipulation of Gemin7 specifically\",\n      \"pmids\": [\"15975577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Live cell imaging of GFP-Gemin7 in neuronal cells showed that Gemin7 localizes to two distinct subsets of neurite granules: stationary bodies and smaller dynamic transport bodies, indicating Gemin7-containing SMN sub-complexes are present in axonal transport granules.\",\n      \"method\": \"Live cell imaging of GFP-tagged Gemin7 in neurite granules\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single localization experiment without direct functional manipulation of Gemin7\",\n      \"pmids\": [\"20188701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In Drosophila, a Gemin6/7/Unrip module (with homologues of human Gemin6 and Gemin7) can be recruited to the SMN complex via the SMN-associated Gemin8 orthologue, mirroring the human SMN complex architecture.\",\n      \"method\": \"In vivo interaction assays in Drosophila\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo interaction in Drosophila model organism consistent with human complex architecture; supports conservation of Gemin7 module recruitment mechanism\",\n      \"pmids\": [\"28949413\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Gemin7 is a core structural component of the SMN complex that adopts an Sm-like fold, forms a heterodimer with Gemin6 via Sm-protein-like interfaces, interacts directly with SMN through its RG repeats, recruits Gemin6 and Unrip into the complex, participates as a central node (together with SMN and Gemin8) in assembling the full SMN complex, and functions as a transient surrogate for the SmD3-SmB particle during snRNP biogenesis before being displaced by the Sm proteins in a Unrip-dependent step.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GEMIN7 is a core structural subunit of the SMN complex, the cytoplasmic machinery that assembles spliceosomal snRNPs [#0, #4]. It binds SMN directly through its arginine-glycine (RG) repeats and recruits Gemin6 into the complex, while also contacting Sm proteins, particularly SmE [#0]. Crystallographic analysis shows GEMIN7 adopts a canonical Sm fold despite lacking Sm sequence similarity and forms a heterodimer with Gemin6 through an Sm-protein-like interface [#1]. Together with SMN and Gemin8, GEMIN7 constitutes the central architectural building block onto which the rest of the complex assembles, as demonstrated by in vitro reconstitution from individual components [#4]; Gemin8 bridges SMN to the Gemin6/Gemin7 heterodimer, and its loss strips Gemin6, GEMIN7, and Unrip from SMN and impairs snRNP assembly [#5]. GEMIN7 additionally recruits Unrip via a stable direct interaction that is linked to cytoplasmic retention of the complex [#2], and Gemin6/Gemin7/Unrip exist as a stable SMN-independent cytoplasmic subcomplex [#6]. Functionally, the Gemin6–Gemin7 heterodimer acts as a transient surrogate for the SmD3–SmB particle during snRNP formation and is exchanged out for the authentic Sm proteins in an Unrip-dependent step [#7]. This module architecture and its recruitment via Gemin8 are conserved in Drosophila [#10].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established GEMIN7 as a bona fide SMN complex member and defined its direct binding partners, answering whether it is a peripheral or integral component.\",\n      \"evidence\": \"Co-IP, immunolocalization, direct pull-down and mass spectrometry identifying SMN (via RG repeats), Gemin6, and Sm protein (SmE) contacts\",\n      \"pmids\": [\"12065586\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural basis for the interactions\", \"Functional role in snRNP assembly not yet tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Solved how GEMIN7 and Gemin6 dimerize, revealing they mimic Sm proteins structurally and explaining their ability to bind Sm proteins.\",\n      \"evidence\": \"X-ray crystallography of the Gemin6-Gemin7 heterodimer plus in vitro Sm-protein binding\",\n      \"pmids\": [\"15939020\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether the Sm-like fold serves a surrogate function in assembly\", \"No structure within the full SMN complex\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified GEMIN7 as the recruiter of Unrip into the SMN complex and linked this interaction to subcellular localization control.\",\n      \"evidence\": \"Reciprocal co-IP, RNAi knockdown of Unrip, and immunofluorescence showing altered nuclear SMN accumulation\",\n      \"pmids\": [\"16159890\", \"15848170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of cytoplasmic retention not resolved\", \"Direct contribution of GEMIN7 (vs Unrip) to localization untested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed GEMIN7 within the central architectural core of the SMN complex by reconstituting the complex from purified parts.\",\n      \"evidence\": \"In vivo/in vitro binding assays and full reconstitution from individual components\",\n      \"pmids\": [\"17178713\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define GEMIN7's catalytic or surrogate role in assembly\", \"Stoichiometry within reconstituted complex not detailed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined the Gemin8-dependent route by which the Gemin6/Gemin7/Unrip module joins SMN and showed this matters for snRNP assembly.\",\n      \"evidence\": \"RNAi of Gemin8, co-IP, and in vitro snRNP assembly assay showing reduced Sm protein (not snRNA) association upon disruption\",\n      \"pmids\": [\"17023415\", \"16434402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not isolate GEMIN7's specific contribution from the module\", \"Step in assembly affected not pinpointed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated that the Gemin6/Gemin7/Unrip subcomplex is structurally autonomous from SMN, establishing it as a pre-formed module.\",\n      \"evidence\": \"Sedimentation analysis and immunoprecipitation showing persistence of the subcomplex upon SMN reduction\",\n      \"pmids\": [\"17640873\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab sedimentation evidence\", \"Functional purpose of the autonomous subcomplex untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed the mechanistic role of GEMIN7 as a transient Sm-protein surrogate that is displaced during snRNP maturation, clarifying why it adopts an Sm fold.\",\n      \"evidence\": \"Mammalian two-hybrid (Gemin2 interaction), in vitro stability/exchange assays, RNAi knockdown reducing assembly and SmE levels, and in vitro snRNP assembly showing Unrip-dependent exchange of the Gemin6-Gemin7 heterodimer for the SmD3-SmB particle\",\n      \"pmids\": [\"19321448\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab in vitro reconstitution\", \"Structural snapshot of the exchange step lacking\", \"Trigger and timing of Unrip-dependent displacement unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed evolutionary conservation of the Gemin6/7/Unrip module recruitment via Gemin8, generalizing the human assembly mechanism.\",\n      \"evidence\": \"In vivo interaction assays in Drosophila with Gemin6/Gemin7/Unrip homologues\",\n      \"pmids\": [\"28949413\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not test functional consequences in the organism\", \"Surrogate-exchange role not examined in Drosophila\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GEMIN7's neuronal/axonal granule localization relates to its snRNP-assembly role, and whether it has SMN-complex-independent functions, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Neurite granule localization (idx 8, 9) rests on imaging without functional manipulation of GEMIN7\", \"No structure of GEMIN7 within the full assembling complex\", \"Direct trigger of the Unrip-dependent surrogate exchange unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [3, 5, 7]}\n    ],\n    \"complexes\": [\"SMN complex\", \"Gemin6-Gemin7-Unrip subcomplex\"],\n    \"partners\": [\"SMN\", \"GEMIN6\", \"GEMIN8\", \"GEMIN2\", \"Unrip\", \"SmE\", \"SmD3\", \"SmB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}