{"gene":"GEMIN2","run_date":"2026-04-28T18:06:52","timeline":{"discoveries":[{"year":1997,"finding":"SMN protein is tightly associated with SIP1/Gemin2 and together they form a complex with spliceosomal snRNP proteins (Sm core proteins B, D1-3, E); SMN interacts directly with several Sm proteins, and SIP1/Gemin2 has sequence similarity with Brr1, a yeast protein critical for snRNP biogenesis, suggesting a role in spliceosomal snRNP biogenesis.","method":"Co-immunoprecipitation, direct binding assays, sequence analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, replicated in two independent papers in the same issue","pmids":["9323129","9323130"],"is_preprint":false},{"year":1997,"finding":"The SMN-SIP1/Gemin2 complex is associated with spliceosomal snRNAs U1 and U5 in the cytoplasm of Xenopus oocytes; antibodies against the SMN-SIP1 complex strongly interfere with cytoplasmic assembly of Sm proteins onto snRNAs and with nuclear import of the snRNP complex, establishing a direct role for SMN-Gemin2 in snRNP biogenesis.","method":"Xenopus oocyte injection, antibody inhibition, RNA immunoprecipitation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — functional reconstitution in oocytes with antibody-based inhibition, replicated","pmids":["9323130"],"is_preprint":false},{"year":2000,"finding":"SMN self-association occurs via regions encoded by exons 2b and 6; exon 2b encodes a binding site for Gemin2/SIP1, and the SMN-Gemin2 interaction occurs between exon 2- and 4-encoded regions within the SMN monomer.","method":"Biomolecular interaction analysis (BIAcore), deletion mapping","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro binding assay with domain mapping","pmids":["11092763"],"is_preprint":false},{"year":2000,"finding":"Gemin2/SIP1 protein levels decrease significantly following depletion of SMN in a conditional SMN-knockout chicken DT40 cell system, supporting that SMN and Gemin2 form a stable complex in vivo and that Gemin2 stability is dependent on SMN.","method":"Tetracycline-repressible SMN expression system, Western blot","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — clean genetic system with direct protein level measurement","pmids":["11121410"],"is_preprint":false},{"year":2001,"finding":"Sip1/Gemin2 is highly expressed in spinal cord during early development and its expression decreases in parallel with SMN during postnatal development; a significant fraction of SMN does not co-localize with Sip1 in neurites of motor neurons, indicating SMN may have Sip1-independent functions in motor neurons.","method":"Confocal immunofluorescence, developmental expression analysis in SMA mouse model and patient cell lines","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment with functional implication in disease-relevant cells","pmids":["11181573"],"is_preprint":false},{"year":2002,"finding":"Reduced Smn/Gemin2 protein levels in Gemin2(+/-)/Smn(+/-) compound heterozygous mice lead to disturbed U snRNP assembly (reduced nuclear accumulation of Sm proteins) and correlate with enhanced motoneuron degeneration, providing in vivo evidence that impaired U snRNP production contributes to motoneuron degeneration.","method":"Mouse genetics (compound heterozygous knockout), immunofluorescence for Sm protein localization, motoneuron counting","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in vivo with orthogonal cellular phenotype readout","pmids":["12091709"],"is_preprint":false},{"year":2006,"finding":"Human GEMIN2 (SIP1) directly binds HIV-1 integrase (IN); reduction of Gemin2 by siRNA dramatically reduces HIV-1 infection and viral cDNA synthesis in primary monocyte-derived macrophages without affecting expression from integrated proviral DNA; co-immunoprecipitation suggests Gemin2 interacts with the incoming viral genome through IN.","method":"Yeast two-hybrid, siRNA knockdown, co-immunoprecipitation, viral infection assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods including functional knockdown and co-IP","pmids":["16731905"],"is_preprint":false},{"year":2007,"finding":"Gemin2 undergoes self-association (homo-dimerization); Gemin2 stabilizes SMN amino-terminal self-association; Gemin2 knockdown by siRNA causes drastic decrease in SMN oligomer formation and snRNP assembly activity, establishing that Gemin2 promotes snRNP assembly by stabilizing the SMN oligomeric complex.","method":"Mammalian two-hybrid, in vitro pull-down, in vitro dissociation assay, siRNA knockdown, snRNP assembly assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal biochemical methods plus functional assay in single study","pmids":["17308308"],"is_preprint":false},{"year":2009,"finding":"HIV-1 integrase together with SIP1/Gemin2 augments reverse transcriptase (RT) activity by enhancing assembly of RT on viral RNA in vitro; SIP1 stabilizes functional multimer forms of IN through prevention of proteasome-mediated degradation; synthetic peptides inhibiting the IN-SIP1 interaction abrogated reverse transcription in vitro and in vivo.","method":"In vitro RT activity assay, peptide inhibitor experiments, siRNA knockdown, multimer formation assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1/2 — in vitro reconstitution plus in vivo siRNA validation","pmids":["19915660"],"is_preprint":false},{"year":2010,"finding":"Human GEMIN2 directly binds RAD51; biochemical analyses show GEMIN2 enhances RAD51-DNA complex formation by inhibiting RAD51 dissociation from DNA and stimulates RAD51-mediated homologous pairing and strand exchange; depletion of GEMIN2 in DT40 and human cells reduces homologous recombination efficiency and decreases RAD51 subnuclear foci formation.","method":"In vitro binding assay, homologous pairing/strand exchange assay, siRNA/gene knockout, RAD51 focus quantification","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with purified proteins plus multiple orthogonal in vivo validations","pmids":["20403813"],"is_preprint":false},{"year":2010,"finding":"Drosophila Gemin2 (CG10419) colocalizes with SMN in cytoplasmic U bodies, which invariably associate with P bodies, establishing that Gemin2 is a component of U bodies and thus a likely site for snRNP assembly.","method":"Immunofluorescence colocalization in Drosophila egg chamber","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 — direct localization experiment in model organism with functional context","pmids":["20452345"],"is_preprint":false},{"year":2011,"finding":"Crystal structure at 2.5 Å of Gemin2 bound to the SmD1/D2/F/E/G pentamer and SMN's Gemin2-binding domain reveals that Gemin2 adopts an extended conformation wrapping around the crescent-shaped pentamer, interacting with all five Sm proteins and reaching into the RNA-binding pocket to prevent RNA binding; an SMA-causing SMN mutation abrogates SMN-Gemin2 interaction.","method":"X-ray crystallography (2.5 Å), structure-function mutagenesis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with mutagenesis validation","pmids":["21816274"],"is_preprint":false},{"year":2011,"finding":"The purified SMN-GEMIN2 fusion complex enhances RAD51-mediated homologous pairing more efficiently than GEMIN2 alone; SMN-GEMIN2 possesses DNA-binding activity not observed with GEMIN2 alone, and significantly stimulates secondary duplex DNA capture by the RAD51-ssDNA complex during homologous pairing.","method":"In vitro purification, homologous pairing assay, DNA-binding assay","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro reconstitution with purified components, single study","pmids":["21732698"],"is_preprint":false},{"year":2012,"finding":"NMR solution structure of Gemin2 bound to the Gemin2-binding domain of SMN reveals how Gemin2 binds SMN and identifies conserved SMN residues (including sites of two SMA patient mutations) that form a conserved SMN/Gemin2 surface likely important for snRNP assembly rather than Gemin2 binding per se.","method":"NMR spectroscopy, structure determination","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — NMR structure with functional mapping of SMA mutations","pmids":["22607171"],"is_preprint":false},{"year":2015,"finding":"Human SMN·Gemin2 forms oligomers spanning the dimer to octamer range, with the YG box oligomerization domain of SMN being both necessary and sufficient for oligomerization; disulfide cross-linking shows SMN tetramers are formed by self-association of stable non-dissociating dimers in a dimer-of-dimers organization.","method":"Analytical ultracentrifugation, X-ray crystallography (1.9 Å of ySMN YG box), disulfide cross-linking","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure combined with multiple biophysical methods","pmids":["26092730"],"is_preprint":false},{"year":2010,"finding":"SMN, Gemin2, and Gemin3 associate with beta-actin mRNA in the cytoplasm of human neuroblastoma (SHSY5Y) cells, providing the first direct evidence that beta-actin mRNA is present in SMN cytoplasmic complexes containing Gemin2.","method":"Targeted mRNA screen, RNA co-immunoprecipitation","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 3 — single Co-IP/RNA pulldown, single study","pmids":["20620147"],"is_preprint":false},{"year":2008,"finding":"Gemin2 knockdown in zebrafish does not directly cause motor axon outgrowth defects; motor axon defects observed in gemin2 morphants are secondary to overall body morphology defects, and motoneuron-specific knockdown of Gemin2 yields normal motor axon development, indicating Gemin2 reduction (unlike SMN reduction) does not directly affect motor axon outgrowth.","method":"Morpholino knockdown in zebrafish, motoneuron-specific electroporation, neuronal transplantation","journal":"Developmental neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple knockdown approaches with cell-autonomous testing","pmids":["18000835"],"is_preprint":false}],"current_model":"GEMIN2 (SIP1) is a core component of the SMN complex that wraps around the Sm protein pentamer (SmD1/D2/F/E/G) via an extended conformation to block premature RNA binding and facilitate specific assembly of spliceosomal snRNPs in the cytoplasm; it stabilizes SMN oligomerization required for this activity, interacts with HIV-1 integrase to promote reverse transcription, and independently stimulates RAD51-mediated homologous recombination by enhancing RAD51 loading onto DNA at double-strand breaks."},"narrative":{"teleology":[{"year":1997,"claim":"Identification of GEMIN2/SIP1 as a stable binding partner of SMN that co-associates with Sm core proteins and snRNAs established the molecular framework for understanding cytoplasmic snRNP assembly.","evidence":"Reciprocal co-immunoprecipitation, direct binding assays, and antibody inhibition of snRNP assembly in Xenopus oocytes","pmids":["9323129","9323130"],"confidence":"High","gaps":["Direct biochemical contribution of GEMIN2 vs. SMN to Sm protein binding was unresolved","Structural basis of the SMN-GEMIN2 interaction unknown"]},{"year":2000,"claim":"Mapping of the SMN-GEMIN2 binding interface to SMN exons 2–4 and demonstration that GEMIN2 protein stability depends on SMN defined the obligate nature of the complex.","evidence":"BIAcore binding analysis with deletion mutants; conditional SMN-knockout DT40 cells showing GEMIN2 degradation upon SMN loss","pmids":["11092763","11121410"],"confidence":"Medium","gaps":["Structural resolution of the binding interface not yet achieved","Whether GEMIN2 reciprocally stabilizes SMN was not tested"]},{"year":2002,"claim":"Genetic evidence in compound heterozygous Gemin2/Smn mice linked reduced snRNP assembly to motoneuron degeneration in vivo, providing the first direct connection between GEMIN2 dosage and SMA-like pathology.","evidence":"Compound heterozygous knockout mice with quantification of nuclear Sm protein localization and motoneuron counts","pmids":["12091709"],"confidence":"High","gaps":["Whether snRNP deficiency is the sole driver of motoneuron loss or whether SMN-independent GEMIN2 functions contribute was not distinguished","Cell-autonomous vs. non-autonomous effects not resolved"]},{"year":2006,"claim":"Discovery of a direct GEMIN2–HIV-1 integrase interaction that promotes reverse transcription revealed an unexpected host-factor role for GEMIN2 in viral replication.","evidence":"Yeast two-hybrid, co-immunoprecipitation, siRNA knockdown reducing HIV-1 cDNA synthesis in primary macrophages","pmids":["16731905"],"confidence":"Medium","gaps":["Mechanism by which GEMIN2 facilitates reverse transcription was unclear","Whether this function is separable from the SMN complex was not addressed"]},{"year":2007,"claim":"Demonstration that GEMIN2 self-associates and stabilizes SMN oligomerization explained how GEMIN2 promotes snRNP assembly activity beyond simply being a binding partner.","evidence":"Mammalian two-hybrid, in vitro pull-down and dissociation assays, siRNA knockdown with snRNP assembly readout","pmids":["17308308"],"confidence":"High","gaps":["Stoichiometry of GEMIN2 within the SMN oligomer was undefined","Whether GEMIN2 dimerization is required for SMN stabilization was not tested with separation-of-function mutants"]},{"year":2009,"claim":"Mechanistic follow-up showed that GEMIN2 stabilizes HIV-1 integrase multimers and enhances reverse transcriptase assembly on viral RNA, with synthetic peptides disrupting the IN–GEMIN2 interface blocking reverse transcription.","evidence":"In vitro RT activity reconstitution, peptide inhibitor experiments, multimer formation assay","pmids":["19915660"],"confidence":"Medium","gaps":["In vivo relevance of synthetic peptide inhibition in animal models not tested","Structural basis of IN–GEMIN2 interaction unknown"]},{"year":2010,"claim":"Discovery that GEMIN2 directly binds RAD51 and stimulates homologous recombination by stabilizing RAD51-DNA filaments established a second major function for GEMIN2 independent of snRNP biology.","evidence":"In vitro reconstitution of homologous pairing with purified proteins; siRNA knockdown and DT40 gene knockout reducing HR efficiency and RAD51 foci","pmids":["20403813"],"confidence":"High","gaps":["Whether the RAD51-binding and SMN-binding activities of GEMIN2 are structurally separable was unknown","Relative physiological importance of HR function vs. snRNP function not assessed"]},{"year":2011,"claim":"The 2.5 Å crystal structure of GEMIN2 bound to the Sm pentamer and SMN's GEMIN2-binding domain revealed the molecular mechanism: GEMIN2's extended conformation wraps around all five Sm proteins and occludes the RNA-binding pocket, acting as a gatekeeper that prevents premature snRNA association.","evidence":"X-ray crystallography at 2.5 Å resolution with structure-guided mutagenesis confirming SMA-causing SMN mutation disrupts SMN-GEMIN2 binding","pmids":["21816274"],"confidence":"High","gaps":["How pICln-loaded Sm intermediates are handed off to GEMIN2 was not captured structurally","Full-length SMN oligomer structure with GEMIN2 not resolved"]},{"year":2012,"claim":"NMR structure of the GEMIN2–SMN interface identified conserved SMN surface residues mutated in SMA patients that are functionally important for snRNP assembly rather than GEMIN2 binding itself, refining disease mechanism understanding.","evidence":"NMR solution structure with mapping of two SMA patient mutations","pmids":["22607171"],"confidence":"High","gaps":["Whether these surface residues mediate interaction with other SMN complex components or substrates was not determined"]},{"year":2015,"claim":"Characterization of SMN·GEMIN2 oligomeric states from dimer to octamer and the dimer-of-dimers architecture of SMN tetramers provided the biophysical framework for understanding the assembly platform.","evidence":"Analytical ultracentrifugation, 1.9 Å crystal structure of yeast SMN YG box, disulfide cross-linking","pmids":["26092730"],"confidence":"High","gaps":["How GEMIN2 stoichiometry varies across oligomeric states was not resolved","Cryo-EM structure of the complete SMN-GEMIN2 complex with full complement of Gemins not yet obtained"]},{"year":null,"claim":"The structural basis of GEMIN2's RAD51-stimulatory activity, the separation-of-function between its snRNP assembly and DNA repair roles, and the in vivo physiological balance between these functions remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of the GEMIN2-RAD51 complex exists","Separation-of-function mutants distinguishing snRNP vs. HR roles have not been generated","Whether GEMIN2's HIV integrase-binding function operates through the same surface as its RAD51 or SMN interactions is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[11,1,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,9,14]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[11,14]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1,10,15]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,5,7,11]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[9,12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,8]}],"complexes":["SMN complex"],"partners":["SMN","SNRPD1","SNRPD2","SNRPF","SNRPE","SNRPG","RAD51","DDX20"],"other_free_text":[]},"mechanistic_narrative":"GEMIN2 (SIP1) is a core subunit of the SMN complex that functions as a molecular chaperone for spliceosomal snRNP assembly and additionally participates in homologous recombination. In snRNP biogenesis, GEMIN2 adopts an extended conformation that wraps around the Sm protein pentamer (SmD1/D2/F/E/G), occluding the RNA-binding pocket to prevent premature RNA association, and simultaneously stabilizes SMN oligomerization required for assembly activity [PMID:21816274, PMID:17308308, PMID:9323130]. Reduced GEMIN2 and SMN levels in compound heterozygous mice impair nuclear snRNP accumulation and enhance motoneuron degeneration, linking the snRNP assembly function to spinal muscular atrophy pathogenesis [PMID:12091709]. Independent of snRNP assembly, GEMIN2 directly binds RAD51 and stimulates RAD51-mediated homologous pairing and strand exchange by stabilizing RAD51-DNA filaments, and its depletion reduces homologous recombination efficiency and RAD51 focus formation in vivo [PMID:20403813, PMID:21732698]."},"prefetch_data":{"uniprot":{"accession":"O14893","full_name":"Gem-associated protein 2","aliases":["Component of gems 2","Survival of motor neuron protein-interacting protein 1","SMN-interacting protein 1"],"length_aa":280,"mass_kda":31.6,"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 (PubMed:18984161, PubMed:9323129). 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) (PubMed:18984161). In the cytosol, the Sm proteins SNRPD1, SNRPD2, SNRPE, SNRPF and SNRPG (5Sm) are trapped in an inactive 6S pICln-Sm complex by the chaperone CLNS1A that controls the assembly of the core snRNP (PubMed:18984161). To assemble core snRNPs, the SMN complex accepts the trapped 5Sm proteins from CLNS1A (PubMed:18984161, PubMed:9323129). Binding of snRNA inside 5Sm ultimately triggers eviction of the SMN complex, thereby allowing binding of SNRPD3 and SNRPB to complete assembly of the core snRNP (PubMed:31799625). Within the SMN complex, GEMIN2 constrains the conformation of 5Sm, thereby promoting 5Sm binding to snRNA containing the snRNP code (a nonameric Sm site and a 3'-adjacent stem-loop), thus preventing progression of assembly until a cognate substrate is bound (PubMed:16314521, PubMed:21816274, PubMed:31799625)","subcellular_location":"Nucleus, gem; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O14893/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/GEMIN2","classification":"Common Essential","n_dependent_lines":963,"n_total_lines":1208,"dependency_fraction":0.7971854304635762},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"SMN1","stoichiometry":10.0},{"gene":"SNRPA","stoichiometry":0.2},{"gene":"SNRPB","stoichiometry":0.2},{"gene":"SNRPC","stoichiometry":0.2},{"gene":"SNRPD2","stoichiometry":0.2},{"gene":"SNRPF","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/GEMIN2","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":"607005","title":"GEM NUCLEAR ORGANELLE-ASSOCIATED PROTEIN 5; GEMIN5","url":"https://www.omim.org/entry/607005"},{"mim_id":"606969","title":"GEM NUCLEAR ORGANELLE-ASSOCIATED PROTEIN 4; GEMIN4","url":"https://www.omim.org/entry/606969"},{"mim_id":"606229","title":"ARGONAUTE RISC COMPONENT 2; AGO2","url":"https://www.omim.org/entry/606229"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nuclear bodies","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GEMIN2"},"hgnc":{"alias_symbol":[],"prev_symbol":["SIP1"]},"alphafold":{"accession":"O14893","domains":[{"cath_id":"1.20.58.1070","chopping":"99-125_137-156_171-274","consensus_level":"high","plddt":90.0035,"start":99,"end":274}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14893","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14893-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14893-F1-predicted_aligned_error_v6.png","plddt_mean":80.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GEMIN2","jax_strain_url":"https://www.jax.org/strain/search?query=GEMIN2"},"sequence":{"accession":"O14893","fasta_url":"https://rest.uniprot.org/uniprotkb/O14893.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14893/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14893"}},"corpus_meta":[{"pmid":"18376396","id":"PMC_18376396","title":"The miR-200 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biogenesis.","date":"1997","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/9323130","citation_count":567,"is_preprint":false},{"pmid":"9323129","id":"PMC_9323129","title":"The spinal muscular atrophy disease gene product, SMN, and its associated protein SIP1 are in a complex with spliceosomal snRNP proteins.","date":"1997","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/9323129","citation_count":567,"is_preprint":false},{"pmid":"12414534","id":"PMC_12414534","title":"Differential expression of the epithelial-mesenchymal transition regulators snail, SIP1, and twist in gastric cancer.","date":"2002","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/12414534","citation_count":488,"is_preprint":false},{"pmid":"16314317","id":"PMC_16314317","title":"SIP1/ZEB2 induces EMT by repressing genes of different epithelial cell-cell junctions.","date":"2005","source":"Nucleic acids 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SMN interacts directly with several Sm proteins, and SIP1/Gemin2 has sequence similarity with Brr1, a yeast protein critical for snRNP biogenesis, suggesting a role in spliceosomal snRNP biogenesis.\",\n      \"method\": \"Co-immunoprecipitation, direct binding assays, sequence analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, replicated in two independent papers in the same issue\",\n      \"pmids\": [\"9323129\", \"9323130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The SMN-SIP1/Gemin2 complex is associated with spliceosomal snRNAs U1 and U5 in the cytoplasm of Xenopus oocytes; antibodies against the SMN-SIP1 complex strongly interfere with cytoplasmic assembly of Sm proteins onto snRNAs and with nuclear import of the snRNP complex, establishing a direct role for SMN-Gemin2 in snRNP biogenesis.\",\n      \"method\": \"Xenopus oocyte injection, antibody inhibition, RNA immunoprecipitation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional reconstitution in oocytes with antibody-based inhibition, replicated\",\n      \"pmids\": [\"9323130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SMN self-association occurs via regions encoded by exons 2b and 6; exon 2b encodes a binding site for Gemin2/SIP1, and the SMN-Gemin2 interaction occurs between exon 2- and 4-encoded regions within the SMN monomer.\",\n      \"method\": \"Biomolecular interaction analysis (BIAcore), deletion mapping\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro binding assay with domain mapping\",\n      \"pmids\": [\"11092763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Gemin2/SIP1 protein levels decrease significantly following depletion of SMN in a conditional SMN-knockout chicken DT40 cell system, supporting that SMN and Gemin2 form a stable complex in vivo and that Gemin2 stability is dependent on SMN.\",\n      \"method\": \"Tetracycline-repressible SMN expression system, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic system with direct protein level measurement\",\n      \"pmids\": [\"11121410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Sip1/Gemin2 is highly expressed in spinal cord during early development and its expression decreases in parallel with SMN during postnatal development; a significant fraction of SMN does not co-localize with Sip1 in neurites of motor neurons, indicating SMN may have Sip1-independent functions in motor neurons.\",\n      \"method\": \"Confocal immunofluorescence, developmental expression analysis in SMA mouse model and patient cell lines\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional implication in disease-relevant cells\",\n      \"pmids\": [\"11181573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Reduced Smn/Gemin2 protein levels in Gemin2(+/-)/Smn(+/-) compound heterozygous mice lead to disturbed U snRNP assembly (reduced nuclear accumulation of Sm proteins) and correlate with enhanced motoneuron degeneration, providing in vivo evidence that impaired U snRNP production contributes to motoneuron degeneration.\",\n      \"method\": \"Mouse genetics (compound heterozygous knockout), immunofluorescence for Sm protein localization, motoneuron counting\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in vivo with orthogonal cellular phenotype readout\",\n      \"pmids\": [\"12091709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human GEMIN2 (SIP1) directly binds HIV-1 integrase (IN); reduction of Gemin2 by siRNA dramatically reduces HIV-1 infection and viral cDNA synthesis in primary monocyte-derived macrophages without affecting expression from integrated proviral DNA; co-immunoprecipitation suggests Gemin2 interacts with the incoming viral genome through IN.\",\n      \"method\": \"Yeast two-hybrid, siRNA knockdown, co-immunoprecipitation, viral infection assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods including functional knockdown and co-IP\",\n      \"pmids\": [\"16731905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Gemin2 undergoes self-association (homo-dimerization); Gemin2 stabilizes SMN amino-terminal self-association; Gemin2 knockdown by siRNA causes drastic decrease in SMN oligomer formation and snRNP assembly activity, establishing that Gemin2 promotes snRNP assembly by stabilizing the SMN oligomeric complex.\",\n      \"method\": \"Mammalian two-hybrid, in vitro pull-down, in vitro dissociation assay, siRNA knockdown, snRNP assembly assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal biochemical methods plus functional assay in single study\",\n      \"pmids\": [\"17308308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HIV-1 integrase together with SIP1/Gemin2 augments reverse transcriptase (RT) activity by enhancing assembly of RT on viral RNA in vitro; SIP1 stabilizes functional multimer forms of IN through prevention of proteasome-mediated degradation; synthetic peptides inhibiting the IN-SIP1 interaction abrogated reverse transcription in vitro and in vivo.\",\n      \"method\": \"In vitro RT activity assay, peptide inhibitor experiments, siRNA knockdown, multimer formation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro reconstitution plus in vivo siRNA validation\",\n      \"pmids\": [\"19915660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human GEMIN2 directly binds RAD51; biochemical analyses show GEMIN2 enhances RAD51-DNA complex formation by inhibiting RAD51 dissociation from DNA and stimulates RAD51-mediated homologous pairing and strand exchange; depletion of GEMIN2 in DT40 and human cells reduces homologous recombination efficiency and decreases RAD51 subnuclear foci formation.\",\n      \"method\": \"In vitro binding assay, homologous pairing/strand exchange assay, siRNA/gene knockout, RAD51 focus quantification\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with purified proteins plus multiple orthogonal in vivo validations\",\n      \"pmids\": [\"20403813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Drosophila Gemin2 (CG10419) colocalizes with SMN in cytoplasmic U bodies, which invariably associate with P bodies, establishing that Gemin2 is a component of U bodies and thus a likely site for snRNP assembly.\",\n      \"method\": \"Immunofluorescence colocalization in Drosophila egg chamber\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct localization experiment in model organism with functional context\",\n      \"pmids\": [\"20452345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure at 2.5 Å of Gemin2 bound to the SmD1/D2/F/E/G pentamer and SMN's Gemin2-binding domain reveals that Gemin2 adopts an extended conformation wrapping around the crescent-shaped pentamer, interacting with all five Sm proteins and reaching into the RNA-binding pocket to prevent RNA binding; an SMA-causing SMN mutation abrogates SMN-Gemin2 interaction.\",\n      \"method\": \"X-ray crystallography (2.5 Å), structure-function mutagenesis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with mutagenesis validation\",\n      \"pmids\": [\"21816274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The purified SMN-GEMIN2 fusion complex enhances RAD51-mediated homologous pairing more efficiently than GEMIN2 alone; SMN-GEMIN2 possesses DNA-binding activity not observed with GEMIN2 alone, and significantly stimulates secondary duplex DNA capture by the RAD51-ssDNA complex during homologous pairing.\",\n      \"method\": \"In vitro purification, homologous pairing assay, DNA-binding assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with purified components, single study\",\n      \"pmids\": [\"21732698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NMR solution structure of Gemin2 bound to the Gemin2-binding domain of SMN reveals how Gemin2 binds SMN and identifies conserved SMN residues (including sites of two SMA patient mutations) that form a conserved SMN/Gemin2 surface likely important for snRNP assembly rather than Gemin2 binding per se.\",\n      \"method\": \"NMR spectroscopy, structure determination\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with functional mapping of SMA mutations\",\n      \"pmids\": [\"22607171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Human SMN·Gemin2 forms oligomers spanning the dimer to octamer range, with the YG box oligomerization domain of SMN being both necessary and sufficient for oligomerization; disulfide cross-linking shows SMN tetramers are formed by self-association of stable non-dissociating dimers in a dimer-of-dimers organization.\",\n      \"method\": \"Analytical ultracentrifugation, X-ray crystallography (1.9 Å of ySMN YG box), disulfide cross-linking\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with multiple biophysical methods\",\n      \"pmids\": [\"26092730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SMN, Gemin2, and Gemin3 associate with beta-actin mRNA in the cytoplasm of human neuroblastoma (SHSY5Y) cells, providing the first direct evidence that beta-actin mRNA is present in SMN cytoplasmic complexes containing Gemin2.\",\n      \"method\": \"Targeted mRNA screen, RNA co-immunoprecipitation\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP/RNA pulldown, single study\",\n      \"pmids\": [\"20620147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Gemin2 knockdown in zebrafish does not directly cause motor axon outgrowth defects; motor axon defects observed in gemin2 morphants are secondary to overall body morphology defects, and motoneuron-specific knockdown of Gemin2 yields normal motor axon development, indicating Gemin2 reduction (unlike SMN reduction) does not directly affect motor axon outgrowth.\",\n      \"method\": \"Morpholino knockdown in zebrafish, motoneuron-specific electroporation, neuronal transplantation\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple knockdown approaches with cell-autonomous testing\",\n      \"pmids\": [\"18000835\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GEMIN2 (SIP1) is a core component of the SMN complex that wraps around the Sm protein pentamer (SmD1/D2/F/E/G) via an extended conformation to block premature RNA binding and facilitate specific assembly of spliceosomal snRNPs in the cytoplasm; it stabilizes SMN oligomerization required for this activity, interacts with HIV-1 integrase to promote reverse transcription, and independently stimulates RAD51-mediated homologous recombination by enhancing RAD51 loading onto DNA at double-strand breaks.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GEMIN2 (SIP1) is a core subunit of the SMN complex that functions as a molecular chaperone for spliceosomal snRNP assembly and additionally participates in homologous recombination. In snRNP biogenesis, GEMIN2 adopts an extended conformation that wraps around the Sm protein pentamer (SmD1/D2/F/E/G), occluding the RNA-binding pocket to prevent premature RNA association, and simultaneously stabilizes SMN oligomerization required for assembly activity [PMID:21816274, PMID:17308308, PMID:9323130]. Reduced GEMIN2 and SMN levels in compound heterozygous mice impair nuclear snRNP accumulation and enhance motoneuron degeneration, linking the snRNP assembly function to spinal muscular atrophy pathogenesis [PMID:12091709]. Independent of snRNP assembly, GEMIN2 directly binds RAD51 and stimulates RAD51-mediated homologous pairing and strand exchange by stabilizing RAD51-DNA filaments, and its depletion reduces homologous recombination efficiency and RAD51 focus formation in vivo [PMID:20403813, PMID:21732698].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of GEMIN2/SIP1 as a stable binding partner of SMN that co-associates with Sm core proteins and snRNAs established the molecular framework for understanding cytoplasmic snRNP assembly.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, direct binding assays, and antibody inhibition of snRNP assembly in Xenopus oocytes\",\n      \"pmids\": [\"9323129\", \"9323130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical contribution of GEMIN2 vs. SMN to Sm protein binding was unresolved\", \"Structural basis of the SMN-GEMIN2 interaction unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Mapping of the SMN-GEMIN2 binding interface to SMN exons 2–4 and demonstration that GEMIN2 protein stability depends on SMN defined the obligate nature of the complex.\",\n      \"evidence\": \"BIAcore binding analysis with deletion mutants; conditional SMN-knockout DT40 cells showing GEMIN2 degradation upon SMN loss\",\n      \"pmids\": [\"11092763\", \"11121410\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural resolution of the binding interface not yet achieved\", \"Whether GEMIN2 reciprocally stabilizes SMN was not tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Genetic evidence in compound heterozygous Gemin2/Smn mice linked reduced snRNP assembly to motoneuron degeneration in vivo, providing the first direct connection between GEMIN2 dosage and SMA-like pathology.\",\n      \"evidence\": \"Compound heterozygous knockout mice with quantification of nuclear Sm protein localization and motoneuron counts\",\n      \"pmids\": [\"12091709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether snRNP deficiency is the sole driver of motoneuron loss or whether SMN-independent GEMIN2 functions contribute was not distinguished\", \"Cell-autonomous vs. non-autonomous effects not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery of a direct GEMIN2–HIV-1 integrase interaction that promotes reverse transcription revealed an unexpected host-factor role for GEMIN2 in viral replication.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, siRNA knockdown reducing HIV-1 cDNA synthesis in primary macrophages\",\n      \"pmids\": [\"16731905\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which GEMIN2 facilitates reverse transcription was unclear\", \"Whether this function is separable from the SMN complex was not addressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that GEMIN2 self-associates and stabilizes SMN oligomerization explained how GEMIN2 promotes snRNP assembly activity beyond simply being a binding partner.\",\n      \"evidence\": \"Mammalian two-hybrid, in vitro pull-down and dissociation assays, siRNA knockdown with snRNP assembly readout\",\n      \"pmids\": [\"17308308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of GEMIN2 within the SMN oligomer was undefined\", \"Whether GEMIN2 dimerization is required for SMN stabilization was not tested with separation-of-function mutants\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mechanistic follow-up showed that GEMIN2 stabilizes HIV-1 integrase multimers and enhances reverse transcriptase assembly on viral RNA, with synthetic peptides disrupting the IN–GEMIN2 interface blocking reverse transcription.\",\n      \"evidence\": \"In vitro RT activity reconstitution, peptide inhibitor experiments, multimer formation assay\",\n      \"pmids\": [\"19915660\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of synthetic peptide inhibition in animal models not tested\", \"Structural basis of IN–GEMIN2 interaction unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Discovery that GEMIN2 directly binds RAD51 and stimulates homologous recombination by stabilizing RAD51-DNA filaments established a second major function for GEMIN2 independent of snRNP biology.\",\n      \"evidence\": \"In vitro reconstitution of homologous pairing with purified proteins; siRNA knockdown and DT40 gene knockout reducing HR efficiency and RAD51 foci\",\n      \"pmids\": [\"20403813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the RAD51-binding and SMN-binding activities of GEMIN2 are structurally separable was unknown\", \"Relative physiological importance of HR function vs. snRNP function not assessed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The 2.5 Å crystal structure of GEMIN2 bound to the Sm pentamer and SMN's GEMIN2-binding domain revealed the molecular mechanism: GEMIN2's extended conformation wraps around all five Sm proteins and occludes the RNA-binding pocket, acting as a gatekeeper that prevents premature snRNA association.\",\n      \"evidence\": \"X-ray crystallography at 2.5 Å resolution with structure-guided mutagenesis confirming SMA-causing SMN mutation disrupts SMN-GEMIN2 binding\",\n      \"pmids\": [\"21816274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How pICln-loaded Sm intermediates are handed off to GEMIN2 was not captured structurally\", \"Full-length SMN oligomer structure with GEMIN2 not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"NMR structure of the GEMIN2–SMN interface identified conserved SMN surface residues mutated in SMA patients that are functionally important for snRNP assembly rather than GEMIN2 binding itself, refining disease mechanism understanding.\",\n      \"evidence\": \"NMR solution structure with mapping of two SMA patient mutations\",\n      \"pmids\": [\"22607171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether these surface residues mediate interaction with other SMN complex components or substrates was not determined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Characterization of SMN·GEMIN2 oligomeric states from dimer to octamer and the dimer-of-dimers architecture of SMN tetramers provided the biophysical framework for understanding the assembly platform.\",\n      \"evidence\": \"Analytical ultracentrifugation, 1.9 Å crystal structure of yeast SMN YG box, disulfide cross-linking\",\n      \"pmids\": [\"26092730\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GEMIN2 stoichiometry varies across oligomeric states was not resolved\", \"Cryo-EM structure of the complete SMN-GEMIN2 complex with full complement of Gemins not yet obtained\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of GEMIN2's RAD51-stimulatory activity, the separation-of-function between its snRNP assembly and DNA repair roles, and the in vivo physiological balance between these functions remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of the GEMIN2-RAD51 complex exists\", \"Separation-of-function mutants distinguishing snRNP vs. HR roles have not been generated\", \"Whether GEMIN2's HIV integrase-binding function operates through the same surface as its RAD51 or SMN interactions is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [11, 1, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 9, 14]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [11, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1, 10, 15]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 5, 7, 11]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [9, 12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 8]}\n    ],\n    \"complexes\": [\n      \"SMN complex\"\n    ],\n    \"partners\": [\n      \"SMN\",\n      \"SNRPD1\",\n      \"SNRPD2\",\n      \"SNRPF\",\n      \"SNRPE\",\n      \"SNRPG\",\n      \"RAD51\",\n      \"DDX20\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}