{"gene":"ZSWIM7","run_date":"2026-06-11T09:02:07","timeline":{"discoveries":[{"year":2006,"finding":"Sws1 (ZSWIM7 ortholog) functions at an early pro-recombinogenic step of homologous recombination in fission yeast, forming a complex with Rlp1 and Rdl1 (RecA-like proteins most closely related to human XRCC2 and RAD51D). Inactivation of Sws1 suppresses the genotoxic sensitivity of srs2Δ and rqh1Δ mutants and rescues the inviability of srs2Δ rqh1Δ cells, placing Sws1 upstream of the antirecombinase activity of Srs2 and Rqh1. The human SWS1 homolog was shown to associate with RAD51D, and ablating SWS1 expression reduces the number of RAD51 foci.","method":"Genetic epistasis (suppressor analysis of srs2Δ rqh1Δ lethality), mass spectrometry-based interactome, co-immunoprecipitation (human SWS1–RAD51D), RAD51 focus formation assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic epistasis in yeast plus Co-IP and functional focus-formation assay in human cells; foundational paper replicated by multiple subsequent studies","pmids":["16710300"],"is_preprint":false},{"year":2015,"finding":"The SWIM domain of SWS1 (CXC…Xn…CXHXXA, extended to include an invariant alanine) is a zinc-binding motif essential for SWS1 function. In vivo disruption of invariant SWIM domain residues abolishes DNA damage tolerance in yeast and disrupts protein–protein interactions in both yeast and human cells. SWS1 is conserved from early-branching eukaryotes (Giardia) through C. elegans, Drosophila, and humans, and in humans it interacts with the RAD51 paralog SWSAP1.","method":"Site-directed mutagenesis of SWIM domain residues, DNA damage sensitivity assays (yeast), yeast two-hybrid and co-immunoprecipitation (human SWS1–SWSAP1), evolutionary/sequence analysis","journal":"Genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of catalytic domain combined with functional damage-tolerance assays and protein interaction experiments across species; multiple orthogonal methods in one study","pmids":["25659377"],"is_preprint":false},{"year":2016,"finding":"In C. elegans, SWS-1 promotes homologous recombination in both mitotic and meiotic nuclei. Direct interaction between SWS-1 and RIP-1 (RAD51 paralog) is mediated by the SWIM domain of SWS-1 and the Walker B motif of RIP-1. RIP-1 bridges an interaction between SWS-1 and RFS-1, forming a trimeric Shu complex. Loss of sws-1 causes sensitivity to DSB-inducing agents and failure to form mitotic RAD-51 foci after camptothecin treatment.","method":"CRISPR-induced nonsense allele (loss-of-function), yeast two-hybrid assay (SWS-1–RIP-1 interaction; SWIM domain and Walker B mutants), RAD-51 focus formation assay, genotoxin sensitivity assays","journal":"Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with defined molecular phenotype plus yeast two-hybrid domain-mapping; multiple orthogonal methods in single focused study","pmids":["26936927"],"is_preprint":false},{"year":2018,"finding":"The mouse Shu complex SWS1–SWSAP1 promotes assembly of RAD51 and DMC1 recombinases on early meiotic HR intermediates. Loss of Swsap1 (and by extension the SWS1 complex) causes meiotic arrest in both sexes, reduced crossover formation, and infertility. Concomitant loss of CHK2 rescues female fertility without rescuing crossover numbers (crossover homeostasis). Concomitant loss of the BRCA2 C terminus aggravates meiotic defects in Swsap1 mutant spermatocytes, indicating overlapping roles.","method":"Mouse knockout (Sws1 and Swsap1 null), immunostaining of RAD51/DMC1 foci on meiotic chromosome spreads, genetic epistasis (Swsap1 × Chk2 double knockout; Swsap1 × Brca2ΔCT double mutant)","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean mouse KO with defined meiotic phenotype replicated by genetic epistasis experiments; multiple orthogonal methods","pmids":["30305635"],"is_preprint":false},{"year":2021,"finding":"The human SWS1–SWSAP1–SPIDR complex controls distinct types of homology-directed repair (HDR): it is required for stable RAD51 assembly at DNA damage sites but is dispensable for intra-chromosomal HDR. It is specifically critical for inter-homolog HDR (first mitotic factor identified for this function), drives high-level sister-chromatid exchange, promotes long-range loss of heterozygosity, and impels poor growth of BLM-deficient cells. SWSAP1 loss prolongs Blm-mutant embryo survival.","method":"Knockout cell lines and mice, HDR reporter assays (intra- vs inter-chromosomal), sister-chromatid exchange assays, RAD51 focus formation, genetic epistasis (Swsap1 × Blm double mutant)","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays distinguishing HDR subtypes, genetic epistasis in cells and mice","pmids":["34253720"],"is_preprint":false},{"year":2021,"finding":"A homozygous frameshift mutation (c.231_232del) in human ZSWIM7 causes decreased meiotic recombination, spermatocyte maturation arrest at a pachytene-like stage with incomplete synapsis, and azoospermia. A corresponding mouse model recapitulated these defects (reduced recombination, meiotic arrest, azoospermia), providing functional evidence that ZSWIM7 is required for meiotic recombination in human spermatogenesis.","method":"Whole-exome sequencing, spermatocyte chromosome spreads (immunostaining for meiotic markers), mouse knock-in model with equivalent mutation","journal":"Human reproduction (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human mutation combined with mouse functional model and chromosome-spread analysis; single lab but two orthogonal approaches","pmids":["33713115"],"is_preprint":false},{"year":2022,"finding":"Loss-of-function variants in ZSWIM7 (homozygous nonsense p.Ser58*) are associated with primary ovarian insufficiency (POI) in humans. ZSWIM7 shows highest expression in the fetal ovary at 15/16 weeks post-conception, coinciding with peak meiosis, and its temporal expression profile parallels other homologous recombination genes in the developing ovary.","method":"Genome sequencing with autosomal recessive variant filtering, qRT-PCR of human fetal gonad, RNA sequencing of fetal gonad developmental time series","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human loss-of-function variant with expression analysis in fetal tissue; molecular mechanism inferred but no in vitro functional reconstitution","pmids":["34402903"],"is_preprint":false},{"year":2022,"finding":"Homozygous deleterious variants in ZSWIM7 alter its DNA-binding region (based on in silico structural modelling), and are associated with absent puberty and prepubertal ovaries/uterus in two unrelated patients, supporting a role for ZSWIM7 in DNA damage response during meiosis and ovarian development.","method":"Exome sequencing, protein conservation analysis, in silico structural modelling of variants","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Low","confidence_rationale":"Tier 4 / Weak — mechanistic claim (DNA-binding region alteration) rests solely on computational modelling; no experimental functional validation","pmids":["35218660"],"is_preprint":false},{"year":2022,"finding":"A missense variant in ZSWIM7 [c.176C>T, p.(Ser59Leu)] causes non-obstructive azoospermia in males and primary ovarian insufficiency in females within the same consanguineous family, demonstrating that ZSWIM7 loss-of-function affects meiotic recombination in both sexes.","method":"Whole exome sequencing, clinical phenotyping of affected males and females","journal":"European journal of medical genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — human genetic study with clinical phenotyping but no direct molecular functional experiment on the variant","pmids":["36202298"],"is_preprint":false},{"year":2025,"finding":"The C. elegans Shu complex (RFS1–RIP1–SWS1 heterotrimer) preferentially binds DNA with an exposed 5′ end, particularly favoring fork-shaped double-stranded DNA. The trimer binds ATP and exhibits DNA-dependent ATPase activity; catalytic residues in the RFS1 subunit were identified by site-specific mutagenesis and validated. The Shu trimer remodels RAD51 filaments in an ATP-hydrolysis-dependent manner and stabilizes filaments in an ATP-binding-dependent manner.","method":"In vitro biochemical reconstitution of trimeric complex, DNA-binding assays, ATPase assays with site-specific mutagenesis of catalytic residues, fluorescence-based RAD51 filament remodeling assays","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and multiple orthogonal biochemical assays; preprint, single lab, not yet peer-reviewed","pmids":["bio_10.1101_2025.11.17.685403"],"is_preprint":true},{"year":2025,"finding":"Novel pathogenic variants in SWS1/ZSWIM7 (c.22del, c.151C>T in addition to previously described variants) and in its partner SWSAP1 (homozygous c.353del frameshift) cause isolated POI. Functional IH-HR assays in mouse embryonic stem cells showed partial decrease or absence of inter-homolog homologous recombination activity in Sws1−/− or Swsap1−/− cells; the SWSAP1 truncation mutant was destabilized. This confirms that all three SWS1-complex members (SWS1/ZSWIM7, SWSAP1, SPIDR) are required for meiotic IH-HR and female fertility.","method":"Exome/genome sequencing, IH-HR reporter assay in mouse embryonic stem cells (Sws1−/− and Swsap1−/−), western blot (protein stability), in silico structural modelling","journal":"Human reproduction (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IH-HR functional assay in KO cells plus protein stability analysis; single lab but two orthogonal methods","pmids":["40991243"],"is_preprint":false},{"year":2025,"finding":"In allotetraploid crucian-carp hybrid males, ZSWIM7 protein is specifically localized to the nuclei of early meiotic primary spermatocytes, as shown by immunofluorescence, supporting a direct role for ZSWIM7 at the site of meiotic recombination.","method":"Immunofluorescence localization in testicular sections, quantitative PCR","journal":"Animals","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by immunofluorescence in a fish model, single method, no functional consequence tested","pmids":["41594540"],"is_preprint":false}],"current_model":"ZSWIM7 (SWS1) is a SWIM-domain zinc-finger protein that forms the core of the evolutionarily conserved Shu complex (SWS1–SWSAP1–SPIDR in mammals; SWS-1–RIP-1–RFS-1 in C. elegans), which acts as an ATPase to remodel and stabilize RAD51 nucleoprotein filaments on ssDNA, thereby promoting the assembly of RAD51 (and meiosis-specific DMC1) at DNA damage sites, facilitating inter-homolog homologous recombination, driving sister-chromatid exchange, and being essential for meiotic progression in both sexes — with loss-of-function causing meiotic arrest, azoospermia, and primary ovarian insufficiency in humans."},"narrative":{"mechanistic_narrative":"ZSWIM7 (SWS1) is a SWIM-domain zinc-finger protein that forms the core of the conserved Shu complex and functions at an early pro-recombinogenic step of homologous recombination [PMID:16710300]. Its SWIM domain is a zinc-binding motif required for both its DNA-damage-tolerance function and its protein-protein interactions, including binding to the RAD51 paralog SWSAP1 in humans [PMID:25659377]. In C. elegans the orthologous SWS-1 contacts the RAD51 paralog RIP-1 through its SWIM domain (engaging the partner's Walker B motif), and RIP-1 in turn bridges SWS-1 to RFS-1 to assemble a trimeric Shu complex [PMID:26936927]. The complex acts as a DNA-dependent ATPase that binds DNA preferentially at exposed 5' / fork-shaped ends, remodels RAD51 nucleoprotein filaments in an ATP-hydrolysis-dependent manner, and stabilizes them in an ATP-binding-dependent manner [PMID:bio_10.1101_2025.11.17.685403]. Through this activity the complex promotes stable assembly of RAD51 and the meiosis-specific recombinase DMC1 at damage sites and on early meiotic intermediates [PMID:30305635], and it is specifically required for inter-homolog homologous recombination and high-level sister-chromatid exchange while being dispensable for intra-chromosomal repair [PMID:34253720]. Loss of function causes meiotic arrest, reduced crossover formation, and infertility in both sexes [PMID:30305635, PMID:34253720]. In humans, loss-of-function ZSWIM7 mutations cause spermatocyte arrest and azoospermia in males [PMID:33713115] and primary ovarian insufficiency in females, consistent with peak ZSWIM7 expression in the fetal ovary at the time of meiosis [PMID:34402903, PMID:40991243].","teleology":[{"year":2006,"claim":"Established that Sws1/ZSWIM7 acts at an early step of homologous recombination and physically links to RecA-like RAD51 paralogs, defining its place upstream of antirecombinase activity.","evidence":"Genetic epistasis of srs2Δ rqh1Δ lethality in fission yeast, mass-spec interactome, and Co-IP of human SWS1 with RAD51D plus RAD51 focus assays","pmids":["16710300"],"confidence":"High","gaps":["Did not define the SWS1 enzymatic activity","Composition of the human complex beyond RAD51D association not resolved"]},{"year":2015,"claim":"Identified the SWIM domain as a zinc-binding motif that is the structural basis for both SWS1 function and its protein interactions, and showed human SWS1 binds SWSAP1.","evidence":"Site-directed mutagenesis of SWIM residues with yeast DNA-damage assays, yeast two-hybrid and Co-IP of human SWS1–SWSAP1","pmids":["25659377"],"confidence":"High","gaps":["No structural model of the zinc coordination","Catalytic activity of the complex not addressed"]},{"year":2016,"claim":"Mapped the molecular architecture of the trimeric Shu complex, showing SWS-1's SWIM domain engages the RAD51-paralog Walker B motif and that the paralog bridges the third subunit.","evidence":"CRISPR loss-of-function alleles in C. elegans, yeast two-hybrid domain mapping, RAD-51 focus and genotoxin sensitivity assays","pmids":["26936927"],"confidence":"High","gaps":["Did not test biochemical activity of the assembled trimer","In vivo stoichiometry not determined"]},{"year":2018,"claim":"Demonstrated the Shu complex is essential for meiotic recombinase loading and fertility, placing it in the RAD51/DMC1 assembly pathway in vivo.","evidence":"Mouse Sws1 and Swsap1 knockouts, RAD51/DMC1 immunostaining on meiotic spreads, epistasis with Chk2 and Brca2ΔCT","pmids":["30305635"],"confidence":"High","gaps":["Direct biochemical mechanism of recombinase loading not shown","Relationship to BRCA2 mechanistically inferred from genetics only"]},{"year":2021,"claim":"Resolved that the complex governs a specific HDR subtype — inter-homolog recombination and sister-chromatid exchange — rather than all homology-directed repair.","evidence":"Human/mouse knockouts, intra- vs inter-chromosomal HDR reporters, SCE assays, RAD51 foci, and Swsap1 × Blm epistasis","pmids":["34253720"],"confidence":"High","gaps":["Molecular basis for HDR-subtype selectivity unknown","Mechanism of SPIDR contribution not defined"]},{"year":2021,"claim":"Linked human ZSWIM7 loss of function to male meiotic arrest, providing the first patient-plus-model evidence for its role in spermatogenesis.","evidence":"Whole-exome sequencing of a frameshift variant, spermatocyte spreads, and an equivalent mouse knock-in","pmids":["33713115"],"confidence":"Medium","gaps":["Single family","No in vitro test of the variant protein"]},{"year":2022,"claim":"Extended the human phenotype to female infertility and absent puberty, correlating ZSWIM7 expression with the meiotic window of fetal ovary.","evidence":"Genome/exome sequencing of nonsense and deleterious variants, qRT-PCR and RNA-seq of fetal gonad, in silico modelling","pmids":["34402903","35218660","36202298"],"confidence":"Medium","gaps":["DNA-binding-region effect rests on computational modelling without functional validation","Some variants phenotyped clinically without molecular assay"]},{"year":2025,"claim":"Defined the biochemical activity of the complex: DNA-end-selective binding, DNA-dependent ATPase activity, and ATP-dependent RAD51 filament remodeling/stabilization.","evidence":"In vitro reconstitution of the C. elegans RFS1–RIP1–SWS1 trimer, DNA-binding and ATPase assays with catalytic-residue mutagenesis, and fluorescence RAD51 remodeling assays (preprint)","pmids":["bio_10.1101_2025.11.17.685403"],"confidence":"High","gaps":["Preprint, single lab, not yet peer-reviewed","Catalytic residues mapped to RFS1, not to ZSWIM7 itself","Human complex not reconstituted"]},{"year":2025,"claim":"Confirmed that all three Shu-complex members are required for inter-homolog HR and female fertility, and that subunit truncation can destabilize the complex.","evidence":"Exome/genome sequencing of ZSWIM7 and SWSAP1 variants, IH-HR reporter assays in Sws1−/− and Swsap1−/− mouse ES cells, western blot for protein stability","pmids":["40991243"],"confidence":"Medium","gaps":["Functional assays performed on knockout cells rather than the patient variant proteins directly","Single lab"]},{"year":null,"claim":"How the SWIM domain and zinc coordination of ZSWIM7 contribute mechanistically to DNA binding, ATPase catalysis, and filament remodeling within the human complex remains undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of the human SWS1–SWSAP1–SPIDR complex","Catalytic contribution of ZSWIM7 versus its paralog partners not separated","Mechanism of inter-homolog HDR selectivity unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[9]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3,4,9]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[9]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[3,5,6]}],"complexes":["Shu complex (SWS1–SWSAP1–SPIDR)"],"partners":["SWSAP1","SPIDR","RAD51D","RIP-1","RFS-1","RAD51"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q19AV6","full_name":"Zinc finger SWIM domain-containing protein 7","aliases":["SWIM domain-containing and Srs2-interacting protein 1 homolog","SWIM-type zinc finger domain-containing protein 7"],"length_aa":140,"mass_kda":15.4,"function":"Involved in early stages of the homologous recombination repair (HRR) pathway of double-stranded DNA breaks arising during DNA replication or induced by DNA-damaging agents. Required for meiotic progression, hence for fertility (PubMed:32719396, PubMed:33713115, PubMed:34402903)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q19AV6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZSWIM7","classification":"Not Classified","n_dependent_lines":41,"n_total_lines":1208,"dependency_fraction":0.03394039735099338},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ZSWIM7","total_profiled":1310},"omim":[{"mim_id":"619834","title":"OVARIAN DYSGENESIS 10; ODG10","url":"https://www.omim.org/entry/619834"},{"mim_id":"619831","title":"SPERMATOGENIC FAILURE 71; SPGF71","url":"https://www.omim.org/entry/619831"},{"mim_id":"614536","title":"SWIM-TYPE ZINC FINGER DOMAIN-CONTAINING PROTEIN 7-ASSOCIATED PROTEIN 1; SWSAP1","url":"https://www.omim.org/entry/614536"},{"mim_id":"614535","title":"ZINC FINGER SWIM DOMAIN-CONTAINING PROTEIN 7; ZSWIM7","url":"https://www.omim.org/entry/614535"},{"mim_id":"258150","title":"SPERMATOGENIC FAILURE 1; SPGF1","url":"https://www.omim.org/entry/258150"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Cytosol","reliability":"Uncertain"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ZSWIM7"},"hgnc":{"alias_symbol":["SWS1"],"prev_symbol":[]},"alphafold":{"accession":"Q19AV6","domains":[{"cath_id":"-","chopping":"6-134","consensus_level":"medium","plddt":94.9865,"start":6,"end":134}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q19AV6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q19AV6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q19AV6-F1-predicted_aligned_error_v6.png","plddt_mean":92.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZSWIM7","jax_strain_url":"https://www.jax.org/strain/search?query=ZSWIM7"},"sequence":{"accession":"Q19AV6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q19AV6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q19AV6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q19AV6"}},"corpus_meta":[{"pmid":"12716987","id":"PMC_12716987","title":"Complex distribution of avian color vision systems revealed by sequencing the SWS1 opsin from total DNA.","date":"2003","source":"Molecular biology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/12716987","citation_count":156,"is_preprint":false},{"pmid":"16710300","id":"PMC_16710300","title":"Sws1 is a conserved regulator of homologous recombination in eukaryotic cells.","date":"2006","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/16710300","citation_count":99,"is_preprint":false},{"pmid":"18025012","id":"PMC_18025012","title":"Chromatic organization of cone photoreceptors in the retina of rainbow trout: single cones irreversibly switch from UV (SWS1) to blue (SWS2) light sensitive opsin during natural development.","date":"2007","source":"The Journal of experimental biology","url":"https://pubmed.ncbi.nlm.nih.gov/18025012","citation_count":65,"is_preprint":false},{"pmid":"30305635","id":"PMC_30305635","title":"Shu complex SWS1-SWSAP1 promotes early steps in mouse meiotic recombination.","date":"2018","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/30305635","citation_count":45,"is_preprint":false},{"pmid":"34253720","id":"PMC_34253720","title":"Distinct pathways of homologous recombination controlled by the SWS1-SWSAP1-SPIDR complex.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34253720","citation_count":38,"is_preprint":false},{"pmid":"24902749","id":"PMC_24902749","title":"Ultraviolet vision in lacertid lizards: evidence from retinal structure, eye transmittance, SWS1 visual pigment genes and behaviour.","date":"2014","source":"The Journal of experimental biology","url":"https://pubmed.ncbi.nlm.nih.gov/24902749","citation_count":34,"is_preprint":false},{"pmid":"25659377","id":"PMC_25659377","title":"Evolutionary and functional analysis of the invariant SWIM domain in the conserved Shu2/SWS1 protein family from Saccharomyces cerevisiae to Homo sapiens.","date":"2015","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25659377","citation_count":33,"is_preprint":false},{"pmid":"19048261","id":"PMC_19048261","title":"Assessing the use of genomic DNA as a predictor of the maximum absorbance wavelength of avian SWS1 opsin visual pigments.","date":"2008","source":"Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology","url":"https://pubmed.ncbi.nlm.nih.gov/19048261","citation_count":31,"is_preprint":false},{"pmid":"26936927","id":"PMC_26936927","title":"Promotion of Homologous Recombination by SWS-1 in Complex with RAD-51 Paralogs in Caenorhabditis elegans.","date":"2016","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26936927","citation_count":26,"is_preprint":false},{"pmid":"34402903","id":"PMC_34402903","title":"ZSWIM7 Is Associated With Human Female Meiosis and Familial Primary Ovarian Insufficiency.","date":"2022","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/34402903","citation_count":21,"is_preprint":false},{"pmid":"33713115","id":"PMC_33713115","title":"A recurrent ZSWIM7 mutation causes male infertility resulting from decreased meiotic recombination.","date":"2021","source":"Human reproduction (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/33713115","citation_count":20,"is_preprint":false},{"pmid":"19684211","id":"PMC_19684211","title":"Changes in thyroid hormone reception precede SWS1 opsin downregulation in trout retina.","date":"2009","source":"The Journal of experimental biology","url":"https://pubmed.ncbi.nlm.nih.gov/19684211","citation_count":20,"is_preprint":false},{"pmid":"20187149","id":"PMC_20187149","title":"Retinal photoreceptor arrangement, SWS1 and LWS opsin sequence, and electroretinography in the South American marsupial Thylamys elegans (Waterhouse, 1839).","date":"2010","source":"The Journal of comparative neurology","url":"https://pubmed.ncbi.nlm.nih.gov/20187149","citation_count":18,"is_preprint":false},{"pmid":"35218660","id":"PMC_35218660","title":"Pathogenic Variants in ZSWIM7 Cause Primary Ovarian Insufficiency.","date":"2022","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/35218660","citation_count":14,"is_preprint":false},{"pmid":"19687143","id":"PMC_19687143","title":"New primers for the avian SWS1 pigment opsin gene reveal new amino acid configurations in spectral sensitivity tuning sites.","date":"2009","source":"The Journal of heredity","url":"https://pubmed.ncbi.nlm.nih.gov/19687143","citation_count":11,"is_preprint":false},{"pmid":"33778962","id":"PMC_33778962","title":"Disrupted eye and head development in rainbow trout with reduced ultraviolet (sws1) opsin expression.","date":"2021","source":"The Journal of comparative neurology","url":"https://pubmed.ncbi.nlm.nih.gov/33778962","citation_count":9,"is_preprint":false},{"pmid":"36202298","id":"PMC_36202298","title":"A novel homozygous variant in homologous recombination repair gene ZSWIM7 causes azoospermia in males and primary ovarian insufficiency in females.","date":"2022","source":"European journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/36202298","citation_count":8,"is_preprint":false},{"pmid":"17107620","id":"PMC_17107620","title":"Short-wavelength sensitive opsin (SWS1) as a new marker for vertebrate phylogenetics.","date":"2006","source":"BMC evolutionary biology","url":"https://pubmed.ncbi.nlm.nih.gov/17107620","citation_count":8,"is_preprint":false},{"pmid":"15051482","id":"PMC_15051482","title":"Chromatin immunoprecipitation assay on the rainbow trout opsin proximal promoters illustrates binding of NF-kappaB and c-jun to the SWS1 promoter in the retina.","date":"2004","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/15051482","citation_count":8,"is_preprint":false},{"pmid":"34562092","id":"PMC_34562092","title":"Simultaneous Expression of UV and Violet SWS1 Opsins Expands the Visual Palette in a Group of Freshwater Snakes.","date":"2021","source":"Molecular biology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/34562092","citation_count":6,"is_preprint":false},{"pmid":"27861878","id":"PMC_27861878","title":"Sequence and localization of an ultraviolet (sws1) opsin in the retina of the Japanese sardine Sardinops melanostictus (Teleostei: Clupeiformes).","date":"2016","source":"Journal of fish biology","url":"https://pubmed.ncbi.nlm.nih.gov/27861878","citation_count":5,"is_preprint":false},{"pmid":"37495865","id":"PMC_37495865","title":"Role of short-wave-sensitive 1 (sws1) in cone development and first feeding in larval zebrafish.","date":"2023","source":"Fish physiology and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/37495865","citation_count":4,"is_preprint":false},{"pmid":"38628922","id":"PMC_38628922","title":"Short-wavelength-sensitive 1 (SWS1) opsin gene duplications and parallel visual pigment tuning support ultraviolet communication in damselfishes (Pomacentridae).","date":"2024","source":"Ecology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/38628922","citation_count":3,"is_preprint":false},{"pmid":"37681889","id":"PMC_37681889","title":"Altered Visual Function in Short-Wave-Sensitive 1 (sws1) Gene Knockout Japanese Medaka (Oryzias latipes) Larvae.","date":"2023","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/37681889","citation_count":3,"is_preprint":false},{"pmid":"32990997","id":"PMC_32990997","title":"Genetic variability of the sws1 cone opsin gene among New World monkeys.","date":"2020","source":"American journal of primatology","url":"https://pubmed.ncbi.nlm.nih.gov/32990997","citation_count":3,"is_preprint":false},{"pmid":"28114101","id":"PMC_28114101","title":"CRISPR Technology Reveals RAD(51)-ical Mechanisms of Repair in Roundworms: An Educational Primer for Use with \"Promotion of Homologous Recombination by SWS-1 in Complex with RAD-51 Paralogs in Caenorhabditis elegans\".","date":"2016","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28114101","citation_count":3,"is_preprint":false},{"pmid":"36301532","id":"PMC_36301532","title":"Retinal Cone Mosaic in sws1-Mutant Medaka (Oryzias latipes), A Teleost.","date":"2022","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/36301532","citation_count":2,"is_preprint":false},{"pmid":"40991243","id":"PMC_40991243","title":"SWS1-complex in premature ovarian insufficiency: SWSAP1 as a new POI gene.","date":"2025","source":"Human reproduction (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/40991243","citation_count":1,"is_preprint":false},{"pmid":"40243101","id":"PMC_40243101","title":"Compound Heterozygous Variants in ZSWIM7 Gene Linked to Infertility and Its Role in Gonadal Development.","date":"2025","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/40243101","citation_count":1,"is_preprint":false},{"pmid":"41594540","id":"PMC_41594540","title":"Polymorphisms and Expression Characteristics of the ZSWIM7 Gene Are Associated with the Fertility of Male Allotetraploid of Red Crucian Carp × Common Carp.","date":"2026","source":"Animals : an open access journal from MDPI","url":"https://pubmed.ncbi.nlm.nih.gov/41594540","citation_count":0,"is_preprint":false},{"pmid":"40299003","id":"PMC_40299003","title":"Dietary carotenoids enhance SWS1 expression in female western mosquitofish (Gambusia affinis) but do not impair their likelihood of pregnancy in the presence of male guppy.","date":"2025","source":"Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology","url":"https://pubmed.ncbi.nlm.nih.gov/40299003","citation_count":0,"is_preprint":false},{"pmid":"41316000","id":"PMC_41316000","title":"Analysis of physiological and molecular mechanisms of cotton trichome aphid resistance based on SWS-1 mutant.","date":"2025","source":"BMC plant biology","url":"https://pubmed.ncbi.nlm.nih.gov/41316000","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.17.685403","title":"The trimeric Shu complex in  <i>C. elegans</i>  is an ATPase that remodels RAD51 filaments in the homologous recombination-associated DNA damage response","date":"2025-11-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.17.685403","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.03.602000","title":"Dynamic Expansions and Retinal Expression of Spectrally Distinct Short-Wavelength Opsin Genes in Sea Snakes","date":"2024-07-05","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.03.602000","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.08.22.609266","title":"Damsels in a hidden colour: development of ultraviolet sensitivity and colour patterns in damselfishes (Pomacentridae)","date":"2024-08-23","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.22.609266","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.12.632585","title":"Exploring the visual system of the Black Grouse (  <i>Lyrurus tetrix</i>  ): Combining experimental and molecular approaches to inform strategies for reducing collisions","date":"2025-01-15","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.12.632585","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.10.617617","title":"Full-length Cryptochrome 1 in the outer segments of the retinal blue cone photoreceptors in humans and great apes suggests a role beyond transcriptional repression","date":"2024-10-11","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.10.617617","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":21294,"output_tokens":3656,"usd":0.059361,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11320,"output_tokens":3355,"usd":0.070237,"stage2_stop_reason":"end_turn"},"total_usd":0.129598,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"Sws1 (ZSWIM7 ortholog) functions at an early pro-recombinogenic step of homologous recombination in fission yeast, forming a complex with Rlp1 and Rdl1 (RecA-like proteins most closely related to human XRCC2 and RAD51D). Inactivation of Sws1 suppresses the genotoxic sensitivity of srs2Δ and rqh1Δ mutants and rescues the inviability of srs2Δ rqh1Δ cells, placing Sws1 upstream of the antirecombinase activity of Srs2 and Rqh1. The human SWS1 homolog was shown to associate with RAD51D, and ablating SWS1 expression reduces the number of RAD51 foci.\",\n      \"method\": \"Genetic epistasis (suppressor analysis of srs2Δ rqh1Δ lethality), mass spectrometry-based interactome, co-immunoprecipitation (human SWS1–RAD51D), RAD51 focus formation assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic epistasis in yeast plus Co-IP and functional focus-formation assay in human cells; foundational paper replicated by multiple subsequent studies\",\n      \"pmids\": [\"16710300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The SWIM domain of SWS1 (CXC…Xn…CXHXXA, extended to include an invariant alanine) is a zinc-binding motif essential for SWS1 function. In vivo disruption of invariant SWIM domain residues abolishes DNA damage tolerance in yeast and disrupts protein–protein interactions in both yeast and human cells. SWS1 is conserved from early-branching eukaryotes (Giardia) through C. elegans, Drosophila, and humans, and in humans it interacts with the RAD51 paralog SWSAP1.\",\n      \"method\": \"Site-directed mutagenesis of SWIM domain residues, DNA damage sensitivity assays (yeast), yeast two-hybrid and co-immunoprecipitation (human SWS1–SWSAP1), evolutionary/sequence analysis\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of catalytic domain combined with functional damage-tolerance assays and protein interaction experiments across species; multiple orthogonal methods in one study\",\n      \"pmids\": [\"25659377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In C. elegans, SWS-1 promotes homologous recombination in both mitotic and meiotic nuclei. Direct interaction between SWS-1 and RIP-1 (RAD51 paralog) is mediated by the SWIM domain of SWS-1 and the Walker B motif of RIP-1. RIP-1 bridges an interaction between SWS-1 and RFS-1, forming a trimeric Shu complex. Loss of sws-1 causes sensitivity to DSB-inducing agents and failure to form mitotic RAD-51 foci after camptothecin treatment.\",\n      \"method\": \"CRISPR-induced nonsense allele (loss-of-function), yeast two-hybrid assay (SWS-1–RIP-1 interaction; SWIM domain and Walker B mutants), RAD-51 focus formation assay, genotoxin sensitivity assays\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with defined molecular phenotype plus yeast two-hybrid domain-mapping; multiple orthogonal methods in single focused study\",\n      \"pmids\": [\"26936927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The mouse Shu complex SWS1–SWSAP1 promotes assembly of RAD51 and DMC1 recombinases on early meiotic HR intermediates. Loss of Swsap1 (and by extension the SWS1 complex) causes meiotic arrest in both sexes, reduced crossover formation, and infertility. Concomitant loss of CHK2 rescues female fertility without rescuing crossover numbers (crossover homeostasis). Concomitant loss of the BRCA2 C terminus aggravates meiotic defects in Swsap1 mutant spermatocytes, indicating overlapping roles.\",\n      \"method\": \"Mouse knockout (Sws1 and Swsap1 null), immunostaining of RAD51/DMC1 foci on meiotic chromosome spreads, genetic epistasis (Swsap1 × Chk2 double knockout; Swsap1 × Brca2ΔCT double mutant)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean mouse KO with defined meiotic phenotype replicated by genetic epistasis experiments; multiple orthogonal methods\",\n      \"pmids\": [\"30305635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The human SWS1–SWSAP1–SPIDR complex controls distinct types of homology-directed repair (HDR): it is required for stable RAD51 assembly at DNA damage sites but is dispensable for intra-chromosomal HDR. It is specifically critical for inter-homolog HDR (first mitotic factor identified for this function), drives high-level sister-chromatid exchange, promotes long-range loss of heterozygosity, and impels poor growth of BLM-deficient cells. SWSAP1 loss prolongs Blm-mutant embryo survival.\",\n      \"method\": \"Knockout cell lines and mice, HDR reporter assays (intra- vs inter-chromosomal), sister-chromatid exchange assays, RAD51 focus formation, genetic epistasis (Swsap1 × Blm double mutant)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays distinguishing HDR subtypes, genetic epistasis in cells and mice\",\n      \"pmids\": [\"34253720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A homozygous frameshift mutation (c.231_232del) in human ZSWIM7 causes decreased meiotic recombination, spermatocyte maturation arrest at a pachytene-like stage with incomplete synapsis, and azoospermia. A corresponding mouse model recapitulated these defects (reduced recombination, meiotic arrest, azoospermia), providing functional evidence that ZSWIM7 is required for meiotic recombination in human spermatogenesis.\",\n      \"method\": \"Whole-exome sequencing, spermatocyte chromosome spreads (immunostaining for meiotic markers), mouse knock-in model with equivalent mutation\",\n      \"journal\": \"Human reproduction (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human mutation combined with mouse functional model and chromosome-spread analysis; single lab but two orthogonal approaches\",\n      \"pmids\": [\"33713115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss-of-function variants in ZSWIM7 (homozygous nonsense p.Ser58*) are associated with primary ovarian insufficiency (POI) in humans. ZSWIM7 shows highest expression in the fetal ovary at 15/16 weeks post-conception, coinciding with peak meiosis, and its temporal expression profile parallels other homologous recombination genes in the developing ovary.\",\n      \"method\": \"Genome sequencing with autosomal recessive variant filtering, qRT-PCR of human fetal gonad, RNA sequencing of fetal gonad developmental time series\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human loss-of-function variant with expression analysis in fetal tissue; molecular mechanism inferred but no in vitro functional reconstitution\",\n      \"pmids\": [\"34402903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Homozygous deleterious variants in ZSWIM7 alter its DNA-binding region (based on in silico structural modelling), and are associated with absent puberty and prepubertal ovaries/uterus in two unrelated patients, supporting a role for ZSWIM7 in DNA damage response during meiosis and ovarian development.\",\n      \"method\": \"Exome sequencing, protein conservation analysis, in silico structural modelling of variants\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — mechanistic claim (DNA-binding region alteration) rests solely on computational modelling; no experimental functional validation\",\n      \"pmids\": [\"35218660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A missense variant in ZSWIM7 [c.176C>T, p.(Ser59Leu)] causes non-obstructive azoospermia in males and primary ovarian insufficiency in females within the same consanguineous family, demonstrating that ZSWIM7 loss-of-function affects meiotic recombination in both sexes.\",\n      \"method\": \"Whole exome sequencing, clinical phenotyping of affected males and females\",\n      \"journal\": \"European journal of medical genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — human genetic study with clinical phenotyping but no direct molecular functional experiment on the variant\",\n      \"pmids\": [\"36202298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The C. elegans Shu complex (RFS1–RIP1–SWS1 heterotrimer) preferentially binds DNA with an exposed 5′ end, particularly favoring fork-shaped double-stranded DNA. The trimer binds ATP and exhibits DNA-dependent ATPase activity; catalytic residues in the RFS1 subunit were identified by site-specific mutagenesis and validated. The Shu trimer remodels RAD51 filaments in an ATP-hydrolysis-dependent manner and stabilizes filaments in an ATP-binding-dependent manner.\",\n      \"method\": \"In vitro biochemical reconstitution of trimeric complex, DNA-binding assays, ATPase assays with site-specific mutagenesis of catalytic residues, fluorescence-based RAD51 filament remodeling assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and multiple orthogonal biochemical assays; preprint, single lab, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.11.17.685403\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Novel pathogenic variants in SWS1/ZSWIM7 (c.22del, c.151C>T in addition to previously described variants) and in its partner SWSAP1 (homozygous c.353del frameshift) cause isolated POI. Functional IH-HR assays in mouse embryonic stem cells showed partial decrease or absence of inter-homolog homologous recombination activity in Sws1−/− or Swsap1−/− cells; the SWSAP1 truncation mutant was destabilized. This confirms that all three SWS1-complex members (SWS1/ZSWIM7, SWSAP1, SPIDR) are required for meiotic IH-HR and female fertility.\",\n      \"method\": \"Exome/genome sequencing, IH-HR reporter assay in mouse embryonic stem cells (Sws1−/− and Swsap1−/−), western blot (protein stability), in silico structural modelling\",\n      \"journal\": \"Human reproduction (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IH-HR functional assay in KO cells plus protein stability analysis; single lab but two orthogonal methods\",\n      \"pmids\": [\"40991243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In allotetraploid crucian-carp hybrid males, ZSWIM7 protein is specifically localized to the nuclei of early meiotic primary spermatocytes, as shown by immunofluorescence, supporting a direct role for ZSWIM7 at the site of meiotic recombination.\",\n      \"method\": \"Immunofluorescence localization in testicular sections, quantitative PCR\",\n      \"journal\": \"Animals\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by immunofluorescence in a fish model, single method, no functional consequence tested\",\n      \"pmids\": [\"41594540\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZSWIM7 (SWS1) is a SWIM-domain zinc-finger protein that forms the core of the evolutionarily conserved Shu complex (SWS1–SWSAP1–SPIDR in mammals; SWS-1–RIP-1–RFS-1 in C. elegans), which acts as an ATPase to remodel and stabilize RAD51 nucleoprotein filaments on ssDNA, thereby promoting the assembly of RAD51 (and meiosis-specific DMC1) at DNA damage sites, facilitating inter-homolog homologous recombination, driving sister-chromatid exchange, and being essential for meiotic progression in both sexes — with loss-of-function causing meiotic arrest, azoospermia, and primary ovarian insufficiency in humans.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZSWIM7 (SWS1) is a SWIM-domain zinc-finger protein that forms the core of the conserved Shu complex and functions at an early pro-recombinogenic step of homologous recombination [#0]. Its SWIM domain is a zinc-binding motif required for both its DNA-damage-tolerance function and its protein-protein interactions, including binding to the RAD51 paralog SWSAP1 in humans [#1]. In C. elegans the orthologous SWS-1 contacts the RAD51 paralog RIP-1 through its SWIM domain (engaging the partner's Walker B motif), and RIP-1 in turn bridges SWS-1 to RFS-1 to assemble a trimeric Shu complex [#2]. The complex acts as a DNA-dependent ATPase that binds DNA preferentially at exposed 5' / fork-shaped ends, remodels RAD51 nucleoprotein filaments in an ATP-hydrolysis-dependent manner, and stabilizes them in an ATP-binding-dependent manner [#9]. Through this activity the complex promotes stable assembly of RAD51 and the meiosis-specific recombinase DMC1 at damage sites and on early meiotic intermediates [#3], and it is specifically required for inter-homolog homologous recombination and high-level sister-chromatid exchange while being dispensable for intra-chromosomal repair [#4]. Loss of function causes meiotic arrest, reduced crossover formation, and infertility in both sexes [#3, #4]. In humans, loss-of-function ZSWIM7 mutations cause spermatocyte arrest and azoospermia in males [#5] and primary ovarian insufficiency in females, consistent with peak ZSWIM7 expression in the fetal ovary at the time of meiosis [#6, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that Sws1/ZSWIM7 acts at an early step of homologous recombination and physically links to RecA-like RAD51 paralogs, defining its place upstream of antirecombinase activity.\",\n      \"evidence\": \"Genetic epistasis of srs2\\u0394 rqh1\\u0394 lethality in fission yeast, mass-spec interactome, and Co-IP of human SWS1 with RAD51D plus RAD51 focus assays\",\n      \"pmids\": [\"16710300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the SWS1 enzymatic activity\", \"Composition of the human complex beyond RAD51D association not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified the SWIM domain as a zinc-binding motif that is the structural basis for both SWS1 function and its protein interactions, and showed human SWS1 binds SWSAP1.\",\n      \"evidence\": \"Site-directed mutagenesis of SWIM residues with yeast DNA-damage assays, yeast two-hybrid and Co-IP of human SWS1\\u2013SWSAP1\",\n      \"pmids\": [\"25659377\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of the zinc coordination\", \"Catalytic activity of the complex not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mapped the molecular architecture of the trimeric Shu complex, showing SWS-1's SWIM domain engages the RAD51-paralog Walker B motif and that the paralog bridges the third subunit.\",\n      \"evidence\": \"CRISPR loss-of-function alleles in C. elegans, yeast two-hybrid domain mapping, RAD-51 focus and genotoxin sensitivity assays\",\n      \"pmids\": [\"26936927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not test biochemical activity of the assembled trimer\", \"In vivo stoichiometry not determined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated the Shu complex is essential for meiotic recombinase loading and fertility, placing it in the RAD51/DMC1 assembly pathway in vivo.\",\n      \"evidence\": \"Mouse Sws1 and Swsap1 knockouts, RAD51/DMC1 immunostaining on meiotic spreads, epistasis with Chk2 and Brca2\\u0394CT\",\n      \"pmids\": [\"30305635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical mechanism of recombinase loading not shown\", \"Relationship to BRCA2 mechanistically inferred from genetics only\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved that the complex governs a specific HDR subtype — inter-homolog recombination and sister-chromatid exchange — rather than all homology-directed repair.\",\n      \"evidence\": \"Human/mouse knockouts, intra- vs inter-chromosomal HDR reporters, SCE assays, RAD51 foci, and Swsap1 \\u00d7 Blm epistasis\",\n      \"pmids\": [\"34253720\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for HDR-subtype selectivity unknown\", \"Mechanism of SPIDR contribution not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked human ZSWIM7 loss of function to male meiotic arrest, providing the first patient-plus-model evidence for its role in spermatogenesis.\",\n      \"evidence\": \"Whole-exome sequencing of a frameshift variant, spermatocyte spreads, and an equivalent mouse knock-in\",\n      \"pmids\": [\"33713115\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single family\", \"No in vitro test of the variant protein\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended the human phenotype to female infertility and absent puberty, correlating ZSWIM7 expression with the meiotic window of fetal ovary.\",\n      \"evidence\": \"Genome/exome sequencing of nonsense and deleterious variants, qRT-PCR and RNA-seq of fetal gonad, in silico modelling\",\n      \"pmids\": [\"34402903\", \"35218660\", \"36202298\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DNA-binding-region effect rests on computational modelling without functional validation\", \"Some variants phenotyped clinically without molecular assay\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined the biochemical activity of the complex: DNA-end-selective binding, DNA-dependent ATPase activity, and ATP-dependent RAD51 filament remodeling/stabilization.\",\n      \"evidence\": \"In vitro reconstitution of the C. elegans RFS1\\u2013RIP1\\u2013SWS1 trimer, DNA-binding and ATPase assays with catalytic-residue mutagenesis, and fluorescence RAD51 remodeling assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.11.17.685403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Preprint, single lab, not yet peer-reviewed\", \"Catalytic residues mapped to RFS1, not to ZSWIM7 itself\", \"Human complex not reconstituted\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Confirmed that all three Shu-complex members are required for inter-homolog HR and female fertility, and that subunit truncation can destabilize the complex.\",\n      \"evidence\": \"Exome/genome sequencing of ZSWIM7 and SWSAP1 variants, IH-HR reporter assays in Sws1\\u2212/\\u2212 and Swsap1\\u2212/\\u2212 mouse ES cells, western blot for protein stability\",\n      \"pmids\": [\"40991243\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional assays performed on knockout cells rather than the patient variant proteins directly\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the SWIM domain and zinc coordination of ZSWIM7 contribute mechanistically to DNA binding, ATPase catalysis, and filament remodeling within the human complex remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of the human SWS1\\u2013SWSAP1\\u2013SPIDR complex\", \"Catalytic contribution of ZSWIM7 versus its paralog partners not separated\", \"Mechanism of inter-homolog HDR selectivity unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 4, 9]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [3, 5, 6]}\n    ],\n    \"complexes\": [\"Shu complex (SWS1\\u2013SWSAP1\\u2013SPIDR)\"],\n    \"partners\": [\"SWSAP1\", \"SPIDR\", \"RAD51D\", \"RIP-1\", \"RFS-1\", \"RAD51\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}