{"gene":"DPY19L2","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2012,"finding":"DPY19L2 protein localizes specifically to the inner nuclear membrane of spermatids in the region facing the acrosomal vesicle. In Dpy19l2 knockout mice, absence of the protein destabilizes the nuclear dense lamina (NDL) and disrupts the junction between the acroplaxome and the nuclear envelope, causing failure of acrosome and manchette attachment to the nucleus, disruption of vesicular trafficking, failure of sperm nuclear shaping, and eventual elimination of the unbound acrosomal vesicle. DPY19L2 is thus the first protein demonstrated to link the acrosome to the nucleus.","method":"Dpy19l2 knockout mouse model; immunolocalization/immunofluorescence; electron microscopy; subcellular fractionation","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with multiple orthogonal methods (immunolocalization, EM, fractionation) and specific phenotypic readout; foundational mechanistic paper replicated by subsequent studies","pmids":["22764053"],"is_preprint":false},{"year":2012,"finding":"DPY19L2 is a transmembrane protein of the inner nuclear membrane; missense mutations affecting predicted transmembrane domains (e.g., p.M358K) are predicted to disrupt protein stability, and loss-of-function point mutations (nonsense p.Q342*, missense p.R290H) cause globozoospermia, confirming that the transmembrane/structural integrity of DPY19L2 is required for its function in acrosome biogenesis.","method":"MLPA; Sanger sequencing of 22 exons; in silico structural analysis of transmembrane domain mutations","journal":"Human reproduction (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — sequencing plus in silico prediction, multiple mutations identified across patients; no direct protein structural validation","pmids":["22627659"],"is_preprint":false},{"year":2014,"finding":"In Dpy19l2 KO mice and DPY19L2-deleted human patients, PLCζ (phospholipase C zeta) is absent or markedly reduced in sperm. PLCζ normally localizes along the inner acrosomal membrane and in the perinuclear theca at the equatorial region; because these structures are absent in globozoospermic sperm (secondary to DPY19L2 loss), PLCζ is lost, preventing sperm-induced Ca2+ oscillations and resulting in oocyte activation failure.","method":"Immunofluorescence localization of PLCζ in control and DPY19L2-deficient human and mouse sperm; Ca2+ oscillation assays after ICSI with KO sperm; Western blot","journal":"Molecular human reproduction","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal localization in human and mouse, functional Ca2+ assay confirming downstream consequence, replicated across species","pmids":["25354701"],"is_preprint":false},{"year":2014,"finding":"Dpy19l2 KO mouse sperm display defective chromatin compaction: the kinetics of histone H4 acetylation waves and transition proteins are abnormal, and protamine nuclear invasion fails, leading to poor chromatin compaction and sperm DNA integrity breakdown. DNA breaks are present before sperm reach the epididymis, indicating they occur during spermiogenesis inside the testis.","method":"Dpy19l2 KO mouse model; immunofluorescence for histone H4 acetylation and transition proteins; protamine staining; TUNEL/comet assay for DNA integrity; ICSI developmental assays","journal":"Molecular human reproduction","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with multiple orthogonal assays (histone modification, protamine staining, DNA integrity), functional embryo development readout","pmids":["25354700"],"is_preprint":false},{"year":2015,"finding":"Sun5 (Spag4l) does not face the acrosome and is not involved in acrosome-nucleus attachment. In Dpy19l2 KO spermatids, upon acrosome detachment, Sun5 relocalizes to the entire nuclear envelope, indicating that DPY19L2-mediated acrosome attachment normally excludes Sun5 from the nuclear envelope region facing the acrosome. This finding demonstrates that DPY19L2-dependent acrosome anchoring restricts Sun5 distribution and that SUN complexes are not the mechanism for acrosome attachment.","method":"Immunohistochemistry and Western blot in wild-type and Dpy19l2 KO mice; localization dynamics during spermatogenesis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with immunolocalization showing relocalization of Sun5, single lab, two methods","pmids":["25775128"],"is_preprint":false},{"year":2017,"finding":"Nuclear lamina maturation is defective in DPY19L2-deleted human globozoospermic spermatozoa: lamin B1 is retained at the whole nuclear periphery (instead of being polarized as in controls) and BAF/BAF-L proteins are absent, whereas BAF transcripts are paradoxically detected in globozoospermic but not control spermatozoa. This indicates that DPY19L2 is required for normal nuclear lamina remodeling and chromatin-partner protein localization during spermiogenesis.","method":"Immunofluorescence analysis of lamin B1, BAF, BAF-L in DPY19L2-deleted patient and control sperm; RT-PCR for spermatid transcripts","journal":"Reproductive biomedicine online","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human patient material, immunofluorescence and RT-PCR, single lab, two orthogonal methods","pmids":["28882431"],"is_preprint":false},{"year":2021,"finding":"FAM209 is a small transmembrane protein that physically associates with DPY19L2, identified as the first in vivo interacting partner of DPY19L2. FAM209 co-localizes with DPY19L2 at the inner nuclear membrane during spermatogenesis and is required for acrosome biogenesis; loss of Fam209 in mice produces globozoospermia, phenocopying Dpy19l2 loss.","method":"Proteomics/mass spectrometry of FAM209 interactome identifying DPY19L2; co-localization by immunofluorescence; Fam209 knockout mouse model with spermiogenesis phenotyping","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS-based interactome plus KO mouse phenotype plus co-localization; multiple orthogonal methods in single rigorous study","pmids":["34471926"],"is_preprint":false},{"year":2018,"finding":"DPY19L2-deficient globozoospermic sperm display altered 3D genome organization: increased number of chromocenters, modified radial positions of telomeres (more central), and altered spatial organization of chromosome territories X, 7, and 18. This suggests DPY19L2 has a structural role in organizing nuclear chromatin architecture in sperm, possibly through interaction with the nuclear lamina.","method":"3D-FISH combined with confocal laser scanning microscopy and 3D image analysis (IMARIS) on DPY19L2-deficient patient and control sperm","journal":"Journal of assisted reproduction and genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — 3D-FISH with quantitative analysis in human patient material, single lab, single method but replicated across multiple chromosome territories","pmids":["30362053"],"is_preprint":false},{"year":2006,"finding":"DPY19L2 is a member of a novel transmembrane gene family (DPY19L) that expanded through low copy repeat-mediated duplication during vertebrate evolution. The current functional human DPY19L2 locus on chromosome 12 represents a relocated duplicate; the ancestral syntenic locus contains only a pseudogene (DPY19L2P1), establishing that the functional copy was repositioned within LCRs.","method":"Comparative genomics; characterization of LCR architecture; identification of pseudogene vs. functional gene at syntenic loci across species","journal":"BMC genomics","confidence":"Low","confidence_rationale":"Tier 4 / Moderate — computational/comparative genomics, no functional protein assay; establishes gene family context and genomic architecture only","pmids":["16526957"],"is_preprint":false}],"current_model":"DPY19L2 encodes a multi-pass transmembrane protein of the inner nuclear membrane of spermatids that physically interacts with FAM209 and is essential for anchoring the developing acrosome to the nuclear envelope; loss of DPY19L2 destabilizes the nuclear dense lamina, disrupts acroplaxome–nuclear envelope junctions, prevents acrosome and manchette attachment, causes failed protamine invasion and chromatin compaction, leads to downstream loss of PLCζ from sperm (abolishing oocyte activation capacity), and results in total globozoospermia and male infertility."},"narrative":{"mechanistic_narrative":"DPY19L2 encodes a multi-pass transmembrane protein of the inner nuclear membrane of spermatids that is essential for acrosome biogenesis and sperm head morphogenesis [PMID:22764053]. It localizes specifically to the region of the inner nuclear membrane facing the acrosomal vesicle, where it physically anchors the developing acrosome to the nucleus; in its absence the nuclear dense lamina is destabilized, the acroplaxome–nuclear envelope junction is lost, and acrosome and manchette attachment, vesicular trafficking, and nuclear shaping all fail, leading to elimination of the unbound acrosomal vesicle and globozoospermia [PMID:22764053]. Its first identified in vivo partner is the small transmembrane protein FAM209, which co-localizes with DPY19L2 at the inner nuclear membrane and is itself required for acrosome biogenesis, with Fam209 loss phenocopying Dpy19l2 loss in mice [PMID:34471926]. DPY19L2-dependent acrosome anchoring also constrains nuclear envelope organization, restricting SUN5 to envelope regions away from the acrosome, indicating that SUN complexes are not the attachment mechanism [PMID:25775128]. Loss of DPY19L2 has broad downstream consequences for sperm nuclear maturation: defective nuclear lamina remodeling with retention of lamin B1 around the whole nuclear periphery and absence of BAF/BAF-L [PMID:28882431], altered three-dimensional chromatin architecture [PMID:30362053], abnormal histone-to-protamine exchange with failed protamine invasion and DNA breaks arising during spermiogenesis [PMID:25354700], and secondary loss of PLCζ that abolishes sperm-induced Ca2+ oscillations and oocyte activation [PMID:25354701]. Loss-of-function and transmembrane-domain mutations in DPY19L2 cause globozoospermia and male infertility in patients [PMID:22627659].","teleology":[{"year":2006,"claim":"Before any function was known, the genomic origin of DPY19L2 was defined, establishing it as a relocated functional duplicate within a vertebrate transmembrane gene family while the ancestral locus carries only a pseudogene.","evidence":"comparative genomics and characterization of low-copy-repeat architecture across species","pmids":["16526957"],"confidence":"Low","gaps":["computational only, with no functional protein assay","does not establish protein localization or biological role","leaves the molecular activity of the protein entirely unknown"]},{"year":2012,"claim":"The central question of what physically connects the acrosome to the spermatid nucleus was answered by showing DPY19L2 is an inner nuclear membrane protein whose loss disrupts the acroplaxome–nuclear envelope junction and acrosome attachment.","evidence":"Dpy19l2 knockout mouse with immunolocalization, electron microscopy, and subcellular fractionation","pmids":["22764053"],"confidence":"High","gaps":["the molecular partner mediating attachment on the acrosomal side was not identified","the biochemical activity of DPY19L2 itself remained undefined","how the protein is targeted to the acrosome-facing membrane region is unknown"]},{"year":2012,"claim":"Patient genetics established that structural/transmembrane integrity of DPY19L2 is required for its function, linking the gene causally to human globozoospermia.","evidence":"MLPA, Sanger sequencing, and in silico transmembrane-domain analysis of patient mutations","pmids":["22627659"],"confidence":"Medium","gaps":["mutation effects on protein stability were predicted in silico, not validated biochemically","no structural model of the transmembrane domains","genotype–phenotype severity correlation not resolved"]},{"year":2014,"claim":"The link between DPY19L2 loss and fertilization failure was traced to secondary loss of PLCζ, explaining why globozoospermic sperm cannot activate oocytes.","evidence":"immunofluorescence of PLCζ in human and mouse sperm plus Ca2+ oscillation assays after ICSI","pmids":["25354701"],"confidence":"High","gaps":["PLCζ loss is a downstream consequence of missing perinuclear structures, not a direct DPY19L2 interaction","does not address whether PLCζ delivery could be restored independently"]},{"year":2014,"claim":"DPY19L2 loss was shown to compromise chromatin maturation, revealing that nuclear anchoring is required for proper histone-to-protamine exchange and DNA integrity.","evidence":"Dpy19l2 knockout mouse with histone H4 acetylation, transition protein and protamine staining, TUNEL/comet DNA-integrity assays, and ICSI development","pmids":["25354700"],"confidence":"High","gaps":["mechanistic link between membrane anchoring and protamine invasion not defined","whether DNA breaks are repairable is unresolved"]},{"year":2015,"claim":"By showing SUN5 relocalizes across the whole envelope only after acrosome detachment, the study excluded SUN complexes as the attachment mechanism and showed DPY19L2 anchoring spatially restricts SUN5.","evidence":"immunohistochemistry and Western blot in wild-type and Dpy19l2 knockout mice tracking SUN5 dynamics","pmids":["25775128"],"confidence":"Medium","gaps":["single lab, two methods","does not identify the actual molecular bridge to the acrosome","no reciprocal interaction data between DPY19L2 and SUN5"]},{"year":2017,"claim":"DPY19L2 was shown to be required for nuclear lamina maturation, with lamin B1 polarization and BAF/BAF-L recruitment dependent on its presence.","evidence":"immunofluorescence of lamin B1, BAF, BAF-L and RT-PCR in DPY19L2-deleted patient and control sperm","pmids":["28882431"],"confidence":"Medium","gaps":["correlative human material, no causal manipulation","the paradoxical retention of BAF transcripts is unexplained","direct interaction between DPY19L2 and lamina components not demonstrated"]},{"year":2018,"claim":"Quantitative 3D imaging extended DPY19L2's role to higher-order genome organization, showing altered chromocenters, telomere positioning, and chromosome territories in deficient sperm.","evidence":"3D-FISH with confocal microscopy and quantitative image analysis in patient versus control sperm","pmids":["30362053"],"confidence":"Medium","gaps":["single method, correlative human material","whether architectural changes are direct or secondary to lamina/compaction defects is unknown"]},{"year":2021,"claim":"The first in vivo molecular partner of DPY19L2 was identified, revealing FAM209 as a co-localizing transmembrane interactor whose loss phenocopies Dpy19l2 loss.","evidence":"FAM209 interactome mass spectrometry, immunofluorescence co-localization, and Fam209 knockout mouse phenotyping","pmids":["34471926"],"confidence":"High","gaps":["the functional role of the DPY19L2–FAM209 complex in attachment is not mechanistically resolved","stoichiometry and additional complex members unknown","no structure of the complex"]},{"year":null,"claim":"The biochemical activity of DPY19L2 and the direct molecular bridge by which the inner nuclear membrane complex tethers the acrosome remain undefined.","evidence":"no enzymatic or structural mechanism established in the available corpus","pmids":[],"confidence":"Low","gaps":["no defined molecular/catalytic activity for DPY19L2","no structural model of the DPY19L2–FAM209 complex","the acrosome-side anchoring partner is unidentified"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[0,6]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,2,3]}],"complexes":[],"partners":["FAM209"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6NUT2","full_name":"Probable C-mannosyltransferase DPY19L2","aliases":["Dpy-19-like protein 2","Protein dpy-19 homolog 2"],"length_aa":758,"mass_kda":87.4,"function":"Probable C-mannosyltransferase that mediates C-mannosylation of tryptophan residues on target proteins Required during spermatogenesis for sperm head elongation and acrosome formation (PubMed:21397063, PubMed:21397064). Also plays a role in acrosome attachment to the nuclear envelope (By similarity)","subcellular_location":"Nucleus inner membrane","url":"https://www.uniprot.org/uniprotkb/Q6NUT2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DPY19L2","classification":"Not Classified","n_dependent_lines":169,"n_total_lines":1207,"dependency_fraction":0.140016570008285},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DPY19L2","total_profiled":1310},"omim":[{"mim_id":"620838","title":"SPERMATOGENIC FAILURE 91; SPGF91","url":"https://www.omim.org/entry/620838"},{"mim_id":"619826","title":"SPERMATOGENIC FAILURE 69; SPGF69","url":"https://www.omim.org/entry/619826"},{"mim_id":"619805","title":"SPERMATOGENIC FAILURE 68; SPGF68","url":"https://www.omim.org/entry/619805"},{"mim_id":"619803","title":"SPERMATOGENIC FAILURE 67; SPGF67","url":"https://www.omim.org/entry/619803"},{"mim_id":"619799","title":"SPERMATOGENIC FAILURE 66; SPGF66","url":"https://www.omim.org/entry/619799"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mitochondria","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"testis","ntpm":78.0}],"url":"https://www.proteinatlas.org/search/DPY19L2"},"hgnc":{"alias_symbol":["FLJ32949","SPATA34"],"prev_symbol":[]},"alphafold":{"accession":"Q6NUT2","domains":[{"cath_id":"-","chopping":"246-611","consensus_level":"medium","plddt":87.5367,"start":246,"end":611},{"cath_id":"3.40.50,3.40.50","chopping":"619-758","consensus_level":"medium","plddt":92.2869,"start":619,"end":758}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6NUT2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6NUT2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6NUT2-F1-predicted_aligned_error_v6.png","plddt_mean":81.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DPY19L2","jax_strain_url":"https://www.jax.org/strain/search?query=DPY19L2"},"sequence":{"accession":"Q6NUT2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6NUT2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6NUT2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6NUT2"}},"corpus_meta":[{"pmid":"21397064","id":"PMC_21397064","title":"A recurrent deletion of DPY19L2 causes infertility in man by blocking sperm head elongation and acrosome formation.","date":"2011","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21397064","citation_count":154,"is_preprint":false},{"pmid":"21397063","id":"PMC_21397063","title":"DPY19L2 deletion as a major cause of globozoospermia.","date":"2011","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21397063","citation_count":152,"is_preprint":false},{"pmid":"22764053","id":"PMC_22764053","title":"Absence of Dpy19l2, a new inner nuclear membrane protein, causes globozoospermia in mice by preventing the anchoring of the acrosome to the nucleus.","date":"2012","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/22764053","citation_count":145,"is_preprint":false},{"pmid":"22653751","id":"PMC_22653751","title":"Globozoospermia is mainly due to DPY19L2 deletion via non-allelic homologous recombination involving two recombination hotspots.","date":"2012","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22653751","citation_count":75,"is_preprint":false},{"pmid":"25354701","id":"PMC_25354701","title":"Subcellular localization of phospholipase Cζ in human sperm and its absence in DPY19L2-deficient sperm are consistent with its role in oocyte activation.","date":"2014","source":"Molecular human reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/25354701","citation_count":75,"is_preprint":false},{"pmid":"25354700","id":"PMC_25354700","title":"Dpy19l2-deficient globozoospermic sperm display altered genome packaging and DNA damage that compromises the initiation of embryo development.","date":"2014","source":"Molecular human reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/25354700","citation_count":58,"is_preprint":false},{"pmid":"23411621","id":"PMC_23411621","title":"Assisted oocyte activation overcomes fertilization failure in globozoospermic patients regardless of the DPY19L2 status.","date":"2013","source":"Human reproduction (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/23411621","citation_count":56,"is_preprint":false},{"pmid":"22627659","id":"PMC_22627659","title":"MLPA and sequence analysis of DPY19L2 reveals point mutations causing globozoospermia.","date":"2012","source":"Human reproduction (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/22627659","citation_count":53,"is_preprint":false},{"pmid":"29339016","id":"PMC_29339016","title":"Expression of sperm PLCζ and clinical outcomes of ICSI-AOA in men affected by globozoospermia due to DPY19L2 deletion.","date":"2017","source":"Reproductive biomedicine online","url":"https://pubmed.ncbi.nlm.nih.gov/29339016","citation_count":48,"is_preprint":false},{"pmid":"23512994","id":"PMC_23512994","title":"DPY19L2 gene mutations are a major cause of globozoospermia: identification of three novel point mutations.","date":"2013","source":"Molecular human reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/23512994","citation_count":42,"is_preprint":false},{"pmid":"25775128","id":"PMC_25775128","title":"Dynamics of Sun5 localization during spermatogenesis in wild type and Dpy19l2 knock-out mice indicates that Sun5 is not involved in acrosome attachment to the nuclear envelope.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25775128","citation_count":34,"is_preprint":false},{"pmid":"30333325","id":"PMC_30333325","title":"Novel DPY19L2 variants in globozoospermic patients and the overcoming this male infertility.","date":"2019","source":"Asian journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/30333325","citation_count":32,"is_preprint":false},{"pmid":"26516168","id":"PMC_26516168","title":"Identification of a new DPY19L2 mutation and a better definition of DPY19L2 deletion breakpoints leading to globozoospermia.","date":"2015","source":"Molecular 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fertility & sterility","url":"https://pubmed.ncbi.nlm.nih.gov/27441053","citation_count":14,"is_preprint":false},{"pmid":"30912172","id":"PMC_30912172","title":"Comparison of sperm morphology and nuclear sperm quality in SPATA16- and DPY19L2-mutated globozoospermic patients.","date":"2019","source":"Andrologia","url":"https://pubmed.ncbi.nlm.nih.gov/30912172","citation_count":13,"is_preprint":false},{"pmid":"30362053","id":"PMC_30362053","title":"Altered three-dimensional organization of sperm genome in DPY19L2-deficient globozoospermic patients.","date":"2018","source":"Journal of assisted reproduction and genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30362053","citation_count":11,"is_preprint":false},{"pmid":"28882431","id":"PMC_28882431","title":"Abnormal retention of nuclear lamina and disorganization of chromatin-related proteins in spermatozoa from DPY19L2-deleted globozoospermic patients.","date":"2017","source":"Reproductive biomedicine 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andrology","url":"https://pubmed.ncbi.nlm.nih.gov/33377718","citation_count":1,"is_preprint":false},{"pmid":"32389181","id":"PMC_32389181","title":"Corrigendum to: Deletion of dpy-19 like 2 (DPY19L2) gene is associated with total but not partial globozoospermia.","date":"2020","source":"Reproduction, fertility, and development","url":"https://pubmed.ncbi.nlm.nih.gov/32389181","citation_count":1,"is_preprint":false},{"pmid":"23214256","id":"PMC_23214256","title":"[DPY19L2 gene and globozoospermia: an update].","date":"2012","source":"Zhonghua nan ke xue = National journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/23214256","citation_count":0,"is_preprint":false},{"pmid":"33491431","id":"PMC_33491431","title":"Molecular Mechanism and Anti-Fertility Effect of Plant Complex Sterility Agent on Targeted Gene DPY19L2 in Rats.","date":"2021","source":"Clinical laboratory","url":"https://pubmed.ncbi.nlm.nih.gov/33491431","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22973,"output_tokens":2570,"usd":0.053734,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9793,"output_tokens":3096,"usd":0.063183,"stage2_stop_reason":"end_turn"},"total_usd":0.116917,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"DPY19L2 protein localizes specifically to the inner nuclear membrane of spermatids in the region facing the acrosomal vesicle. In Dpy19l2 knockout mice, absence of the protein destabilizes the nuclear dense lamina (NDL) and disrupts the junction between the acroplaxome and the nuclear envelope, causing failure of acrosome and manchette attachment to the nucleus, disruption of vesicular trafficking, failure of sperm nuclear shaping, and eventual elimination of the unbound acrosomal vesicle. DPY19L2 is thus the first protein demonstrated to link the acrosome to the nucleus.\",\n      \"method\": \"Dpy19l2 knockout mouse model; immunolocalization/immunofluorescence; electron microscopy; subcellular fractionation\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with multiple orthogonal methods (immunolocalization, EM, fractionation) and specific phenotypic readout; foundational mechanistic paper replicated by subsequent studies\",\n      \"pmids\": [\"22764053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DPY19L2 is a transmembrane protein of the inner nuclear membrane; missense mutations affecting predicted transmembrane domains (e.g., p.M358K) are predicted to disrupt protein stability, and loss-of-function point mutations (nonsense p.Q342*, missense p.R290H) cause globozoospermia, confirming that the transmembrane/structural integrity of DPY19L2 is required for its function in acrosome biogenesis.\",\n      \"method\": \"MLPA; Sanger sequencing of 22 exons; in silico structural analysis of transmembrane domain mutations\",\n      \"journal\": \"Human reproduction (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — sequencing plus in silico prediction, multiple mutations identified across patients; no direct protein structural validation\",\n      \"pmids\": [\"22627659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In Dpy19l2 KO mice and DPY19L2-deleted human patients, PLCζ (phospholipase C zeta) is absent or markedly reduced in sperm. PLCζ normally localizes along the inner acrosomal membrane and in the perinuclear theca at the equatorial region; because these structures are absent in globozoospermic sperm (secondary to DPY19L2 loss), PLCζ is lost, preventing sperm-induced Ca2+ oscillations and resulting in oocyte activation failure.\",\n      \"method\": \"Immunofluorescence localization of PLCζ in control and DPY19L2-deficient human and mouse sperm; Ca2+ oscillation assays after ICSI with KO sperm; Western blot\",\n      \"journal\": \"Molecular human reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal localization in human and mouse, functional Ca2+ assay confirming downstream consequence, replicated across species\",\n      \"pmids\": [\"25354701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Dpy19l2 KO mouse sperm display defective chromatin compaction: the kinetics of histone H4 acetylation waves and transition proteins are abnormal, and protamine nuclear invasion fails, leading to poor chromatin compaction and sperm DNA integrity breakdown. DNA breaks are present before sperm reach the epididymis, indicating they occur during spermiogenesis inside the testis.\",\n      \"method\": \"Dpy19l2 KO mouse model; immunofluorescence for histone H4 acetylation and transition proteins; protamine staining; TUNEL/comet assay for DNA integrity; ICSI developmental assays\",\n      \"journal\": \"Molecular human reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with multiple orthogonal assays (histone modification, protamine staining, DNA integrity), functional embryo development readout\",\n      \"pmids\": [\"25354700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Sun5 (Spag4l) does not face the acrosome and is not involved in acrosome-nucleus attachment. In Dpy19l2 KO spermatids, upon acrosome detachment, Sun5 relocalizes to the entire nuclear envelope, indicating that DPY19L2-mediated acrosome attachment normally excludes Sun5 from the nuclear envelope region facing the acrosome. This finding demonstrates that DPY19L2-dependent acrosome anchoring restricts Sun5 distribution and that SUN complexes are not the mechanism for acrosome attachment.\",\n      \"method\": \"Immunohistochemistry and Western blot in wild-type and Dpy19l2 KO mice; localization dynamics during spermatogenesis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with immunolocalization showing relocalization of Sun5, single lab, two methods\",\n      \"pmids\": [\"25775128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Nuclear lamina maturation is defective in DPY19L2-deleted human globozoospermic spermatozoa: lamin B1 is retained at the whole nuclear periphery (instead of being polarized as in controls) and BAF/BAF-L proteins are absent, whereas BAF transcripts are paradoxically detected in globozoospermic but not control spermatozoa. This indicates that DPY19L2 is required for normal nuclear lamina remodeling and chromatin-partner protein localization during spermiogenesis.\",\n      \"method\": \"Immunofluorescence analysis of lamin B1, BAF, BAF-L in DPY19L2-deleted patient and control sperm; RT-PCR for spermatid transcripts\",\n      \"journal\": \"Reproductive biomedicine online\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human patient material, immunofluorescence and RT-PCR, single lab, two orthogonal methods\",\n      \"pmids\": [\"28882431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FAM209 is a small transmembrane protein that physically associates with DPY19L2, identified as the first in vivo interacting partner of DPY19L2. FAM209 co-localizes with DPY19L2 at the inner nuclear membrane during spermatogenesis and is required for acrosome biogenesis; loss of Fam209 in mice produces globozoospermia, phenocopying Dpy19l2 loss.\",\n      \"method\": \"Proteomics/mass spectrometry of FAM209 interactome identifying DPY19L2; co-localization by immunofluorescence; Fam209 knockout mouse model with spermiogenesis phenotyping\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS-based interactome plus KO mouse phenotype plus co-localization; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"34471926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DPY19L2-deficient globozoospermic sperm display altered 3D genome organization: increased number of chromocenters, modified radial positions of telomeres (more central), and altered spatial organization of chromosome territories X, 7, and 18. This suggests DPY19L2 has a structural role in organizing nuclear chromatin architecture in sperm, possibly through interaction with the nuclear lamina.\",\n      \"method\": \"3D-FISH combined with confocal laser scanning microscopy and 3D image analysis (IMARIS) on DPY19L2-deficient patient and control sperm\",\n      \"journal\": \"Journal of assisted reproduction and genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — 3D-FISH with quantitative analysis in human patient material, single lab, single method but replicated across multiple chromosome territories\",\n      \"pmids\": [\"30362053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DPY19L2 is a member of a novel transmembrane gene family (DPY19L) that expanded through low copy repeat-mediated duplication during vertebrate evolution. The current functional human DPY19L2 locus on chromosome 12 represents a relocated duplicate; the ancestral syntenic locus contains only a pseudogene (DPY19L2P1), establishing that the functional copy was repositioned within LCRs.\",\n      \"method\": \"Comparative genomics; characterization of LCR architecture; identification of pseudogene vs. functional gene at syntenic loci across species\",\n      \"journal\": \"BMC genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Moderate — computational/comparative genomics, no functional protein assay; establishes gene family context and genomic architecture only\",\n      \"pmids\": [\"16526957\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DPY19L2 encodes a multi-pass transmembrane protein of the inner nuclear membrane of spermatids that physically interacts with FAM209 and is essential for anchoring the developing acrosome to the nuclear envelope; loss of DPY19L2 destabilizes the nuclear dense lamina, disrupts acroplaxome–nuclear envelope junctions, prevents acrosome and manchette attachment, causes failed protamine invasion and chromatin compaction, leads to downstream loss of PLCζ from sperm (abolishing oocyte activation capacity), and results in total globozoospermia and male infertility.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DPY19L2 encodes a multi-pass transmembrane protein of the inner nuclear membrane of spermatids that is essential for acrosome biogenesis and sperm head morphogenesis [#0]. It localizes specifically to the region of the inner nuclear membrane facing the acrosomal vesicle, where it physically anchors the developing acrosome to the nucleus; in its absence the nuclear dense lamina is destabilized, the acroplaxome–nuclear envelope junction is lost, and acrosome and manchette attachment, vesicular trafficking, and nuclear shaping all fail, leading to elimination of the unbound acrosomal vesicle and globozoospermia [#0]. Its first identified in vivo partner is the small transmembrane protein FAM209, which co-localizes with DPY19L2 at the inner nuclear membrane and is itself required for acrosome biogenesis, with Fam209 loss phenocopying Dpy19l2 loss in mice [#6]. DPY19L2-dependent acrosome anchoring also constrains nuclear envelope organization, restricting SUN5 to envelope regions away from the acrosome, indicating that SUN complexes are not the attachment mechanism [#4]. Loss of DPY19L2 has broad downstream consequences for sperm nuclear maturation: defective nuclear lamina remodeling with retention of lamin B1 around the whole nuclear periphery and absence of BAF/BAF-L [#5], altered three-dimensional chromatin architecture [#7], abnormal histone-to-protamine exchange with failed protamine invasion and DNA breaks arising during spermiogenesis [#3], and secondary loss of PLCζ that abolishes sperm-induced Ca2+ oscillations and oocyte activation [#2]. Loss-of-function and transmembrane-domain mutations in DPY19L2 cause globozoospermia and male infertility in patients [#1].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Before any function was known, the genomic origin of DPY19L2 was defined, establishing it as a relocated functional duplicate within a vertebrate transmembrane gene family while the ancestral locus carries only a pseudogene.\",\n      \"evidence\": \"comparative genomics and characterization of low-copy-repeat architecture across species\",\n      \"pmids\": [\"16526957\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"computational only, with no functional protein assay\", \"does not establish protein localization or biological role\", \"leaves the molecular activity of the protein entirely unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The central question of what physically connects the acrosome to the spermatid nucleus was answered by showing DPY19L2 is an inner nuclear membrane protein whose loss disrupts the acroplaxome–nuclear envelope junction and acrosome attachment.\",\n      \"evidence\": \"Dpy19l2 knockout mouse with immunolocalization, electron microscopy, and subcellular fractionation\",\n      \"pmids\": [\"22764053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"the molecular partner mediating attachment on the acrosomal side was not identified\", \"the biochemical activity of DPY19L2 itself remained undefined\", \"how the protein is targeted to the acrosome-facing membrane region is unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Patient genetics established that structural/transmembrane integrity of DPY19L2 is required for its function, linking the gene causally to human globozoospermia.\",\n      \"evidence\": \"MLPA, Sanger sequencing, and in silico transmembrane-domain analysis of patient mutations\",\n      \"pmids\": [\"22627659\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mutation effects on protein stability were predicted in silico, not validated biochemically\", \"no structural model of the transmembrane domains\", \"genotype–phenotype severity correlation not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The link between DPY19L2 loss and fertilization failure was traced to secondary loss of PLCζ, explaining why globozoospermic sperm cannot activate oocytes.\",\n      \"evidence\": \"immunofluorescence of PLCζ in human and mouse sperm plus Ca2+ oscillation assays after ICSI\",\n      \"pmids\": [\"25354701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PLCζ loss is a downstream consequence of missing perinuclear structures, not a direct DPY19L2 interaction\", \"does not address whether PLCζ delivery could be restored independently\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"DPY19L2 loss was shown to compromise chromatin maturation, revealing that nuclear anchoring is required for proper histone-to-protamine exchange and DNA integrity.\",\n      \"evidence\": \"Dpy19l2 knockout mouse with histone H4 acetylation, transition protein and protamine staining, TUNEL/comet DNA-integrity assays, and ICSI development\",\n      \"pmids\": [\"25354700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mechanistic link between membrane anchoring and protamine invasion not defined\", \"whether DNA breaks are repairable is unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"By showing SUN5 relocalizes across the whole envelope only after acrosome detachment, the study excluded SUN complexes as the attachment mechanism and showed DPY19L2 anchoring spatially restricts SUN5.\",\n      \"evidence\": \"immunohistochemistry and Western blot in wild-type and Dpy19l2 knockout mice tracking SUN5 dynamics\",\n      \"pmids\": [\"25775128\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"single lab, two methods\", \"does not identify the actual molecular bridge to the acrosome\", \"no reciprocal interaction data between DPY19L2 and SUN5\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"DPY19L2 was shown to be required for nuclear lamina maturation, with lamin B1 polarization and BAF/BAF-L recruitment dependent on its presence.\",\n      \"evidence\": \"immunofluorescence of lamin B1, BAF, BAF-L and RT-PCR in DPY19L2-deleted patient and control sperm\",\n      \"pmids\": [\"28882431\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"correlative human material, no causal manipulation\", \"the paradoxical retention of BAF transcripts is unexplained\", \"direct interaction between DPY19L2 and lamina components not demonstrated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Quantitative 3D imaging extended DPY19L2's role to higher-order genome organization, showing altered chromocenters, telomere positioning, and chromosome territories in deficient sperm.\",\n      \"evidence\": \"3D-FISH with confocal microscopy and quantitative image analysis in patient versus control sperm\",\n      \"pmids\": [\"30362053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"single method, correlative human material\", \"whether architectural changes are direct or secondary to lamina/compaction defects is unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The first in vivo molecular partner of DPY19L2 was identified, revealing FAM209 as a co-localizing transmembrane interactor whose loss phenocopies Dpy19l2 loss.\",\n      \"evidence\": \"FAM209 interactome mass spectrometry, immunofluorescence co-localization, and Fam209 knockout mouse phenotyping\",\n      \"pmids\": [\"34471926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"the functional role of the DPY19L2–FAM209 complex in attachment is not mechanistically resolved\", \"stoichiometry and additional complex members unknown\", \"no structure of the complex\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The biochemical activity of DPY19L2 and the direct molecular bridge by which the inner nuclear membrane complex tethers the acrosome remain undefined.\",\n      \"evidence\": \"no enzymatic or structural mechanism established in the available corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"no defined molecular/catalytic activity for DPY19L2\", \"no structural model of the DPY19L2–FAM209 complex\", \"the acrosome-side anchoring partner is unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FAM209\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}