{"gene":"NLRP14","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2017,"finding":"NLRP14 physically interacts with components of the nucleic acid sensing pathway and targets TBK1 (TANK binding kinase 1) for ubiquitination and degradation, thereby negatively regulating cytosolic DNA and RNA sensing in germ cells. Specific domains in NLRP14 and TBK1 mediate this inhibitory function.","method":"Co-immunoprecipitation, functional genomics, domain mapping, ubiquitination assays; human loss-of-function germline variant associated with male sterility showed hyper-responsiveness to nucleic acids","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal physical interaction demonstrated, mechanistic pathway placement via ubiquitination assay, domain mapping, and human variant functional validation, single lab but multiple orthogonal methods","pmids":["28423339"],"is_preprint":false},{"year":2020,"finding":"NLRP14 promotes spermatogenesis by recruiting the chaperone cofactor BAG2 to bind HSPA2, forming a NLRP14-HSPA2-BAG2 complex that inhibits CHIP E3 ligase-mediated HSPA2 polyubiquitination and promotes HSPA2 nuclear translocation. Knockout of Nlrp14 in mice inhibits spermatogonial stem cell differentiation and meiosis, causing oligozoospermia and sperm abnormality. A human nonsense germline variant confirmed loss of BAG2 recruitment.","method":"Mouse knockout, co-immunoprecipitation, ubiquitination assay, in vitro PGCLC differentiation, human variant functional characterization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with defined cellular phenotype, complex reconstituted by Co-IP, mechanistic ubiquitination assay, validated with human germline variant; multiple orthogonal methods in one study","pmids":["32839316"],"is_preprint":false},{"year":2023,"finding":"NLRP14 interacts with the intrinsically disordered region (IDR) domain of the mitochondrial Na+/Ca2+ exchanger NCLX (encoded by Slc8b1) and maintains NCLX protein stability by regulating K27-linked ubiquitination. Loss of maternal NLRP14 leads to decreased NCLX levels, disrupted calcium oscillations, altered mitochondrial distribution/morphology, impaired cytoplasmic UHRF1 abundance, and early embryonic arrest at the 2-cell stage.","method":"Maternal knockout mouse model, proteomics, co-immunoprecipitation, ubiquitination assay, spindle transfer rescue experiment","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with defined phenotype, proteomics identifying substrate, Co-IP for interaction, ubiquitination assay for mechanism, cytoplasm transfer rescue providing orthogonal functional validation","pmids":["37493331"],"is_preprint":false},{"year":2023,"finding":"NLRP14 maintains cytoplasmic UHRF1 abundance by protecting it from proteasome-dependent degradation and anchoring it from nuclear translocation in oocytes. Maternal loss of Nlrp14 causes oocyte maturation defects and early embryonic arrest. Human compound heterozygous NLRP14 variants found in infertile women interrupted the NLRP14-UHRF1 interaction and decreased UHRF1 levels.","method":"Maternal knockout mouse, co-immunoprecipitation, proteasome inhibitor rescue, nuclear/cytoplasmic fractionation, human variant functional analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with cellular phenotype, Co-IP demonstrating interaction, pharmacological rescue experiment, and human variant validation; multiple orthogonal methods","pmids":["38060382"],"is_preprint":false},{"year":2014,"finding":"Crystal structures of human NLRP14 pyrin domain (wild-type and clinical D86V mutant) revealed an unexpected rearrangement of the C-terminal helix α6, resulting in an extended α5/6 stem-helix that mediates a novel symmetric pyrin-domain dimerization mode. This conformational switching is controlled by a charge-relay system that dramatically impacts protein stability and influences downstream effector recruitment.","method":"X-ray crystallography, mutagenesis, protein stability assays","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures of wild-type and mutant with functional stability analysis; rigorous structural study with mechanistic interpretation","pmids":["25004977"],"is_preprint":false},{"year":2022,"finding":"Maternal deficiency of Nlrp14 causes aberrant nuclear localization of Dnmt1/Uhrf1 in mouse zygotes, leading to defects in DNA-replication-coupled passive demethylation and impaired 5hmC deposition, revealing NLRP14 as a regulator of epigenetic reprogramming in early embryos.","method":"Maternal knockout mouse, immunofluorescence/subcellular localization, bisulfite sequencing, genome-wide methylation profiling","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with defined epigenetic and localization phenotypes, genome-wide profiling plus direct imaging of protein localization with functional consequence","pmids":["36539615"],"is_preprint":false},{"year":2026,"finding":"NLRP14 acts as a dual regulator of E3 ubiquitin ligases during the oocyte-to-embryo transition. Structural studies (cryo-EM/X-ray) identified KDM2A and UHRF1 as two distinct binding partners. NLRP14 competitively inhibits KDM2A-mediated SCF (SKP1-CUL1-F-box) complex assembly, and allosterically inhibits UHRF1 activity by occupying the UBE2D (E2 ubiquitin-conjugating enzyme) binding site of its UBL domain. NLRP14 deletion in mice increases ubiquitination levels in oocytes, demonstrating it restrains excessive protein ubiquitination to maintain proteostasis.","method":"Cryo-EM/X-ray structure determination of NLRP14-KDM2A-SKP1 and NLRP14-UHRF1 complexes, mouse knockout, in vitro ubiquitination assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic structures of two complexes with mechanistic mutagenesis interpretation, KO mouse phenotype, and in vitro ubiquitination assay; multiple orthogonal methods","pmids":["41951593"],"is_preprint":false},{"year":2026,"finding":"NLRP14 is a structural component of the cytoplasmic lattice (CPL) in mammalian oocytes. Cryo-EM structure of isolated CPL revealed that NLRP14 is part of central-symmetric assemblies (UBE2D3-UHRF1-NLRP14) forming the underfoot base of the U-shaped basket (UB) structural unit within the repeating CPL filament.","method":"Cryo-EM structure determination of CPL isolated from mouse oocytes, mass spectrometry identification of subunits","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structure of native complex with subunit identification; single rigorous study with definitive structural method","pmids":["41845018"],"is_preprint":false},{"year":2026,"finding":"Using an Nlrp14-deficient model (which disrupts zygotic localization of UHRF1 and DNMT1), nuclear exclusion of UHRF1 was shown to be essential for mouse zygotic genome activation (ZGA). Failure to exclude UHRF1 from the nucleus impedes DNA demethylation at LINE1 elements, promotes UHRF1 binding to silence their expression, reduces global chromatin accessibility, and inhibits ZGA. Uhrf1/Nlrp14 double knockout embryos rescued ZGA, confirming UHRF1 as the downstream effector of NLRP14's role in ZGA.","method":"Nlrp14 KO, Uhrf1/Nlrp14 double KO, Dnmt1/Nlrp14 double KO, ATAC-seq, ChIP-seq, bisulfite sequencing, genetic epistasis","journal":"Cell discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via double knockouts, genome-wide chromatin and methylation profiling, multiple orthogonal approaches defining pathway position","pmids":["42191687"],"is_preprint":false}],"current_model":"NLRP14 is a gonad-specific NLR protein that functions as a multifunctional maternal effect factor: it negatively regulates cytosolic nucleic acid sensing by targeting TBK1 for ubiquitination and degradation; promotes spermatogenesis by forming a NLRP14-HSPA2-BAG2 complex that protects HSPA2 from polyubiquitination; maintains calcium homeostasis in oocytes by stabilizing the mitochondrial Ca2+ exchanger NCLX via K27-linked ubiquitination regulation; controls proteostasis during the oocyte-to-embryo transition by dually inhibiting E3 ubiquitin ligase activity (competitively blocking SCF assembly via KDM2A and allosterically inhibiting UHRF1 via its UBL domain); anchors UHRF1 in the oocyte cytoplasm to ensure its nuclear exclusion in zygotes, which is required for DNA demethylation, chromatin accessibility, and zygotic genome activation; and structurally participates in the cytoplasmic lattice filament of oocytes as part of a UBE2D3-UHRF1-NLRP14 assembly."},"narrative":{"mechanistic_narrative":"NLRP14 is a gonad-specific NLR protein that operates as a multifunctional regulator of germ cell development and the oocyte-to-embryo transition, acting primarily by controlling protein ubiquitination and stability of key partners [PMID:32839316, PMID:41951593]. In germ cells it dampens innate nucleic acid sensing by physically engaging the cytosolic DNA/RNA sensing machinery and directing TBK1 for ubiquitination and degradation [PMID:28423339]. During spermatogenesis NLRP14 recruits the cochaperone BAG2 into a NLRP14-HSPA2-BAG2 complex that shields HSPA2 from CHIP-mediated polyubiquitination and promotes its nuclear translocation, and its loss in mice impairs spermatogonial stem cell differentiation and meiosis [PMID:32839316]. In oocytes and early embryos NLRP14 maintains proteostasis through several stabilizing and inhibitory activities: it preserves the mitochondrial Na+/Ca2+ exchanger NCLX by regulating K27-linked ubiquitination to sustain calcium oscillations and mitochondrial integrity [PMID:37493331], and it restrains excessive ubiquitination by acting as a dual E3 ligase inhibitor — competitively blocking KDM2A-dependent SCF assembly and allosterically inhibiting UHRF1 by occupying the UBE2D-binding site of its UBL domain [PMID:41951593]. A central function is the cytoplasmic anchoring and stabilization of UHRF1: NLRP14 protects UHRF1 from proteasomal degradation and retains it in the oocyte cytoplasm, and this nuclear exclusion of UHRF1 (and DNMT1) in zygotes is required for DNA-replication-coupled passive demethylation, chromatin accessibility, and zygotic genome activation, as demonstrated by genetic epistasis in which loss of Uhrf1 rescues the Nlrp14-deficient phenotype [PMID:38060382, PMID:36539615, PMID:42191687]. Structurally, NLRP14 contributes to the cytoplasmic lattice filament of oocytes as part of a UBE2D3-UHRF1-NLRP14 assembly [PMID:41845018], and its pyrin domain adopts a charge-relay-controlled conformational switch that governs dimerization and stability [PMID:25004977]. Human loss-of-function and compound heterozygous NLRP14 variants are associated with male sterility and female infertility through disruption of these interactions [PMID:28423339, PMID:32839316, PMID:38060382].","teleology":[{"year":2014,"claim":"Established the structural basis of NLRP14's pyrin domain, showing a conformational switch that governs dimerization and stability rather than a static fold.","evidence":"X-ray crystallography of wild-type and D86V pyrin domain with mutagenesis and stability assays","pmids":["25004977"],"confidence":"High","gaps":["Does not connect the pyrin-domain switch to a specific physiological partner or pathway","Effector recruitment consequences inferred structurally, not validated in cells"]},{"year":2017,"claim":"Defined NLRP14's first signaling role, answering whether a gonad-specific NLR regulates innate immunity, by placing it as a negative regulator of cytosolic nucleic acid sensing.","evidence":"Co-IP, domain mapping, ubiquitination assays, and a human male-sterility variant showing hyper-responsiveness to nucleic acids","pmids":["28423339"],"confidence":"High","gaps":["The E3 ligase mediating TBK1 ubiquitination is not identified","Physiological relevance of immune dampening in germ cells beyond sterility not detailed"]},{"year":2020,"claim":"Showed how NLRP14 supports spermatogenesis by acting as a chaperone-stabilizing scaffold that protects HSPA2 from degradation.","evidence":"Nlrp14 knockout mouse, Co-IP reconstituting the NLRP14-HSPA2-BAG2 complex, ubiquitination assay, and a human nonsense variant","pmids":["32839316"],"confidence":"High","gaps":["Mechanism by which HSPA2 nuclear translocation drives meiosis not resolved","Whether this complex operates in oocytes not addressed"]},{"year":2022,"claim":"Identified NLRP14 as a maternal regulator of epigenetic reprogramming by controlling subcellular localization of the DNA-methylation machinery.","evidence":"Maternal KO mouse with imaging of Dnmt1/Uhrf1 localization, bisulfite and genome-wide methylation profiling","pmids":["36539615"],"confidence":"High","gaps":["Molecular basis of how NLRP14 controls Uhrf1/Dnmt1 nuclear localization not defined here","Downstream transcriptional consequences not yet mapped"]},{"year":2023,"claim":"Linked NLRP14 to oocyte calcium homeostasis by showing it stabilizes the mitochondrial exchanger NCLX through K27-linked ubiquitination control.","evidence":"Maternal KO mouse, proteomics, Co-IP to NCLX IDR, ubiquitination assay, and spindle/cytoplasm transfer rescue","pmids":["37493331"],"confidence":"High","gaps":["The ubiquitin ligase/deubiquitinase acting on NCLX not identified","Causal hierarchy between calcium defects and UHRF1 loss not separated"]},{"year":2023,"claim":"Demonstrated direct physical anchoring of UHRF1 by NLRP14 in oocyte cytoplasm, protecting it from proteasomal degradation and explaining maternal infertility variants.","evidence":"Maternal KO mouse, Co-IP, proteasome inhibitor rescue, nuclear/cytoplasmic fractionation, and human compound heterozygous variants","pmids":["38060382"],"confidence":"High","gaps":["Structural mechanism of the NLRP14-UHRF1 interaction not yet resolved at this stage","Whether anchoring and stabilization are separable functions unclear"]},{"year":2026,"claim":"Resolved the molecular mechanism of NLRP14 as a dual E3 ligase inhibitor, distinguishing competitive (KDM2A/SCF) from allosteric (UHRF1 UBL) inhibition.","evidence":"Cryo-EM/X-ray structures of NLRP14-KDM2A-SKP1 and NLRP14-UHRF1 complexes, KO mouse showing increased oocyte ubiquitination, in vitro ubiquitination assays","pmids":["41951593"],"confidence":"High","gaps":["Full set of E3 ligases regulated by NLRP14 in vivo not enumerated","Quantitative contribution of each inhibitory mode to proteostasis not partitioned"]},{"year":2026,"claim":"Placed NLRP14 as a structural subunit of the oocyte cytoplasmic lattice, integrating its UHRF1-anchoring role into a defined macromolecular architecture.","evidence":"Cryo-EM of native cytoplasmic lattice from mouse oocytes with mass-spectrometry subunit identification (UBE2D3-UHRF1-NLRP14 assembly)","pmids":["41845018"],"confidence":"High","gaps":["Functional requirement of NLRP14 for CPL assembly versus being a passenger not tested","Relationship between CPL incorporation and UHRF1 sequestration not mechanistically linked"]},{"year":2026,"claim":"Established UHRF1 nuclear exclusion as the causal downstream effector of NLRP14 in zygotic genome activation through genetic epistasis.","evidence":"Nlrp14 KO, Uhrf1/Nlrp14 and Dnmt1/Nlrp14 double KO with ATAC-seq, ChIP-seq, and bisulfite sequencing","pmids":["42191687"],"confidence":"High","gaps":["How LINE1 demethylation drives chromatin opening mechanistically not fully resolved","Contribution of NLRP14's other targets (NCLX, KDM2A) to ZGA not dissected"]},{"year":null,"claim":"It remains unresolved how NLRP14's diverse activities — immune dampening, chaperone scaffolding, calcium homeostasis, dual ligase inhibition, and cytoplasmic lattice structure — are integrated and temporally coordinated across germ cell and embryonic stages.","evidence":"","pmids":[],"confidence":"High","gaps":["No unifying model connecting the immune and reproductive functions","Stage-specific partner switching not characterized","Upstream signals controlling NLRP14 activity unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2,3,6]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,6]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[7]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,3]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,7]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,2,3,6]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[5,8]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[1,3]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0]}],"complexes":["NLRP14-HSPA2-BAG2 complex","cytoplasmic lattice (UBE2D3-UHRF1-NLRP14 assembly)"],"partners":["TBK1","HSPA2","BAG2","NCLX","UHRF1","KDM2A","UBE2D3","DNMT1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q86W24","full_name":"NACHT, LRR and PYD domains-containing protein 14","aliases":["Nucleotide-binding oligomerization domain protein 5"],"length_aa":1093,"mass_kda":124.7,"function":"May be involved in inflammation and spermatogenesis","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q86W24/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NLRP14","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NLRP14","total_profiled":1310},"omim":[{"mim_id":"609665","title":"NLR FAMILY, PYRIN DOMAIN-CONTAINING 14; NLRP14","url":"https://www.omim.org/entry/609665"},{"mim_id":"606636","title":"NLR FAMILY, PYRIN DOMAIN-CONTAINING 1; NLRP1","url":"https://www.omim.org/entry/606636"},{"mim_id":"605980","title":"NUCLEOTIDE-BINDING OLIGOMERIZATION DOMAIN PROTEIN 1; NOD1","url":"https://www.omim.org/entry/605980"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Cytosol","reliability":"Uncertain"}],"tissue_specificity":"Not detected","tissue_distribution":"Not detected","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NLRP14"},"hgnc":{"alias_symbol":["NOD5","GC-LRR","Nalp-iota","PAN8","CLR11.2"],"prev_symbol":["NALP14"]},"alphafold":{"accession":"Q86W24","domains":[{"cath_id":"1.10.533.10","chopping":"14-84","consensus_level":"high","plddt":78.6141,"start":14,"end":84},{"cath_id":"3.40.50,3.40.50","chopping":"125-328","consensus_level":"high","plddt":84.4608,"start":125,"end":328},{"cath_id":"-","chopping":"576-641_656-705","consensus_level":"medium","plddt":91.0437,"start":576,"end":705},{"cath_id":"3.80.10.10","chopping":"942-1093","consensus_level":"medium","plddt":88.418,"start":942,"end":1093},{"cath_id":"1.10.1900","chopping":"333-395","consensus_level":"medium","plddt":91.8751,"start":333,"end":395}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86W24","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86W24-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86W24-F1-predicted_aligned_error_v6.png","plddt_mean":85.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NLRP14","jax_strain_url":"https://www.jax.org/strain/search?query=NLRP14"},"sequence":{"accession":"Q86W24","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86W24.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86W24/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86W24"}},"corpus_meta":[{"pmid":"36539615","id":"PMC_36539615","title":"Dynamics 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discovery","url":"https://pubmed.ncbi.nlm.nih.gov/42191687","citation_count":0,"is_preprint":false},{"pmid":"41948963","id":"PMC_41948963","title":"Genome-Wide Characterization of Sex-Linked Regions in the Sangzhi Horned Toad (Boulenophrys sangzhiensis) Reveals Complex Sex Determination Mechanisms.","date":"2026","source":"Molecular ecology resources","url":"https://pubmed.ncbi.nlm.nih.gov/41948963","citation_count":0,"is_preprint":false},{"pmid":"28465417","id":"PMC_28465417","title":"Shutting down innate immune responses during fertilization.","date":"2017","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/28465417","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":17472,"output_tokens":2786,"usd":0.047103,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10148,"output_tokens":3801,"usd":0.072883,"stage2_stop_reason":"end_turn"},"total_usd":0.119986,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2017,\n      \"finding\": \"NLRP14 physically interacts with components of the nucleic acid sensing pathway and targets TBK1 (TANK binding kinase 1) for ubiquitination and degradation, thereby negatively regulating cytosolic DNA and RNA sensing in germ cells. Specific domains in NLRP14 and TBK1 mediate this inhibitory function.\",\n      \"method\": \"Co-immunoprecipitation, functional genomics, domain mapping, ubiquitination assays; human loss-of-function germline variant associated with male sterility showed hyper-responsiveness to nucleic acids\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal physical interaction demonstrated, mechanistic pathway placement via ubiquitination assay, domain mapping, and human variant functional validation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"28423339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NLRP14 promotes spermatogenesis by recruiting the chaperone cofactor BAG2 to bind HSPA2, forming a NLRP14-HSPA2-BAG2 complex that inhibits CHIP E3 ligase-mediated HSPA2 polyubiquitination and promotes HSPA2 nuclear translocation. Knockout of Nlrp14 in mice inhibits spermatogonial stem cell differentiation and meiosis, causing oligozoospermia and sperm abnormality. A human nonsense germline variant confirmed loss of BAG2 recruitment.\",\n      \"method\": \"Mouse knockout, co-immunoprecipitation, ubiquitination assay, in vitro PGCLC differentiation, human variant functional characterization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with defined cellular phenotype, complex reconstituted by Co-IP, mechanistic ubiquitination assay, validated with human germline variant; multiple orthogonal methods in one study\",\n      \"pmids\": [\"32839316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NLRP14 interacts with the intrinsically disordered region (IDR) domain of the mitochondrial Na+/Ca2+ exchanger NCLX (encoded by Slc8b1) and maintains NCLX protein stability by regulating K27-linked ubiquitination. Loss of maternal NLRP14 leads to decreased NCLX levels, disrupted calcium oscillations, altered mitochondrial distribution/morphology, impaired cytoplasmic UHRF1 abundance, and early embryonic arrest at the 2-cell stage.\",\n      \"method\": \"Maternal knockout mouse model, proteomics, co-immunoprecipitation, ubiquitination assay, spindle transfer rescue experiment\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with defined phenotype, proteomics identifying substrate, Co-IP for interaction, ubiquitination assay for mechanism, cytoplasm transfer rescue providing orthogonal functional validation\",\n      \"pmids\": [\"37493331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NLRP14 maintains cytoplasmic UHRF1 abundance by protecting it from proteasome-dependent degradation and anchoring it from nuclear translocation in oocytes. Maternal loss of Nlrp14 causes oocyte maturation defects and early embryonic arrest. Human compound heterozygous NLRP14 variants found in infertile women interrupted the NLRP14-UHRF1 interaction and decreased UHRF1 levels.\",\n      \"method\": \"Maternal knockout mouse, co-immunoprecipitation, proteasome inhibitor rescue, nuclear/cytoplasmic fractionation, human variant functional analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with cellular phenotype, Co-IP demonstrating interaction, pharmacological rescue experiment, and human variant validation; multiple orthogonal methods\",\n      \"pmids\": [\"38060382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structures of human NLRP14 pyrin domain (wild-type and clinical D86V mutant) revealed an unexpected rearrangement of the C-terminal helix α6, resulting in an extended α5/6 stem-helix that mediates a novel symmetric pyrin-domain dimerization mode. This conformational switching is controlled by a charge-relay system that dramatically impacts protein stability and influences downstream effector recruitment.\",\n      \"method\": \"X-ray crystallography, mutagenesis, protein stability assays\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures of wild-type and mutant with functional stability analysis; rigorous structural study with mechanistic interpretation\",\n      \"pmids\": [\"25004977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Maternal deficiency of Nlrp14 causes aberrant nuclear localization of Dnmt1/Uhrf1 in mouse zygotes, leading to defects in DNA-replication-coupled passive demethylation and impaired 5hmC deposition, revealing NLRP14 as a regulator of epigenetic reprogramming in early embryos.\",\n      \"method\": \"Maternal knockout mouse, immunofluorescence/subcellular localization, bisulfite sequencing, genome-wide methylation profiling\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with defined epigenetic and localization phenotypes, genome-wide profiling plus direct imaging of protein localization with functional consequence\",\n      \"pmids\": [\"36539615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NLRP14 acts as a dual regulator of E3 ubiquitin ligases during the oocyte-to-embryo transition. Structural studies (cryo-EM/X-ray) identified KDM2A and UHRF1 as two distinct binding partners. NLRP14 competitively inhibits KDM2A-mediated SCF (SKP1-CUL1-F-box) complex assembly, and allosterically inhibits UHRF1 activity by occupying the UBE2D (E2 ubiquitin-conjugating enzyme) binding site of its UBL domain. NLRP14 deletion in mice increases ubiquitination levels in oocytes, demonstrating it restrains excessive protein ubiquitination to maintain proteostasis.\",\n      \"method\": \"Cryo-EM/X-ray structure determination of NLRP14-KDM2A-SKP1 and NLRP14-UHRF1 complexes, mouse knockout, in vitro ubiquitination assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic structures of two complexes with mechanistic mutagenesis interpretation, KO mouse phenotype, and in vitro ubiquitination assay; multiple orthogonal methods\",\n      \"pmids\": [\"41951593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NLRP14 is a structural component of the cytoplasmic lattice (CPL) in mammalian oocytes. Cryo-EM structure of isolated CPL revealed that NLRP14 is part of central-symmetric assemblies (UBE2D3-UHRF1-NLRP14) forming the underfoot base of the U-shaped basket (UB) structural unit within the repeating CPL filament.\",\n      \"method\": \"Cryo-EM structure determination of CPL isolated from mouse oocytes, mass spectrometry identification of subunits\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structure of native complex with subunit identification; single rigorous study with definitive structural method\",\n      \"pmids\": [\"41845018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Using an Nlrp14-deficient model (which disrupts zygotic localization of UHRF1 and DNMT1), nuclear exclusion of UHRF1 was shown to be essential for mouse zygotic genome activation (ZGA). Failure to exclude UHRF1 from the nucleus impedes DNA demethylation at LINE1 elements, promotes UHRF1 binding to silence their expression, reduces global chromatin accessibility, and inhibits ZGA. Uhrf1/Nlrp14 double knockout embryos rescued ZGA, confirming UHRF1 as the downstream effector of NLRP14's role in ZGA.\",\n      \"method\": \"Nlrp14 KO, Uhrf1/Nlrp14 double KO, Dnmt1/Nlrp14 double KO, ATAC-seq, ChIP-seq, bisulfite sequencing, genetic epistasis\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via double knockouts, genome-wide chromatin and methylation profiling, multiple orthogonal approaches defining pathway position\",\n      \"pmids\": [\"42191687\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NLRP14 is a gonad-specific NLR protein that functions as a multifunctional maternal effect factor: it negatively regulates cytosolic nucleic acid sensing by targeting TBK1 for ubiquitination and degradation; promotes spermatogenesis by forming a NLRP14-HSPA2-BAG2 complex that protects HSPA2 from polyubiquitination; maintains calcium homeostasis in oocytes by stabilizing the mitochondrial Ca2+ exchanger NCLX via K27-linked ubiquitination regulation; controls proteostasis during the oocyte-to-embryo transition by dually inhibiting E3 ubiquitin ligase activity (competitively blocking SCF assembly via KDM2A and allosterically inhibiting UHRF1 via its UBL domain); anchors UHRF1 in the oocyte cytoplasm to ensure its nuclear exclusion in zygotes, which is required for DNA demethylation, chromatin accessibility, and zygotic genome activation; and structurally participates in the cytoplasmic lattice filament of oocytes as part of a UBE2D3-UHRF1-NLRP14 assembly.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NLRP14 is a gonad-specific NLR protein that operates as a multifunctional regulator of germ cell development and the oocyte-to-embryo transition, acting primarily by controlling protein ubiquitination and stability of key partners [#1, #6]. In germ cells it dampens innate nucleic acid sensing by physically engaging the cytosolic DNA/RNA sensing machinery and directing TBK1 for ubiquitination and degradation [#0]. During spermatogenesis NLRP14 recruits the cochaperone BAG2 into a NLRP14-HSPA2-BAG2 complex that shields HSPA2 from CHIP-mediated polyubiquitination and promotes its nuclear translocation, and its loss in mice impairs spermatogonial stem cell differentiation and meiosis [#1]. In oocytes and early embryos NLRP14 maintains proteostasis through several stabilizing and inhibitory activities: it preserves the mitochondrial Na+/Ca2+ exchanger NCLX by regulating K27-linked ubiquitination to sustain calcium oscillations and mitochondrial integrity [#2], and it restrains excessive ubiquitination by acting as a dual E3 ligase inhibitor — competitively blocking KDM2A-dependent SCF assembly and allosterically inhibiting UHRF1 by occupying the UBE2D-binding site of its UBL domain [#6]. A central function is the cytoplasmic anchoring and stabilization of UHRF1: NLRP14 protects UHRF1 from proteasomal degradation and retains it in the oocyte cytoplasm, and this nuclear exclusion of UHRF1 (and DNMT1) in zygotes is required for DNA-replication-coupled passive demethylation, chromatin accessibility, and zygotic genome activation, as demonstrated by genetic epistasis in which loss of Uhrf1 rescues the Nlrp14-deficient phenotype [#3, #5, #8]. Structurally, NLRP14 contributes to the cytoplasmic lattice filament of oocytes as part of a UBE2D3-UHRF1-NLRP14 assembly [#7], and its pyrin domain adopts a charge-relay-controlled conformational switch that governs dimerization and stability [#4]. Human loss-of-function and compound heterozygous NLRP14 variants are associated with male sterility and female infertility through disruption of these interactions [#0, #1, #3].\"\n  ,\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Established the structural basis of NLRP14's pyrin domain, showing a conformational switch that governs dimerization and stability rather than a static fold.\",\n      \"evidence\": \"X-ray crystallography of wild-type and D86V pyrin domain with mutagenesis and stability assays\",\n      \"pmids\": [\"25004977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not connect the pyrin-domain switch to a specific physiological partner or pathway\", \"Effector recruitment consequences inferred structurally, not validated in cells\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined NLRP14's first signaling role, answering whether a gonad-specific NLR regulates innate immunity, by placing it as a negative regulator of cytosolic nucleic acid sensing.\",\n      \"evidence\": \"Co-IP, domain mapping, ubiquitination assays, and a human male-sterility variant showing hyper-responsiveness to nucleic acids\",\n      \"pmids\": [\"28423339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The E3 ligase mediating TBK1 ubiquitination is not identified\", \"Physiological relevance of immune dampening in germ cells beyond sterility not detailed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed how NLRP14 supports spermatogenesis by acting as a chaperone-stabilizing scaffold that protects HSPA2 from degradation.\",\n      \"evidence\": \"Nlrp14 knockout mouse, Co-IP reconstituting the NLRP14-HSPA2-BAG2 complex, ubiquitination assay, and a human nonsense variant\",\n      \"pmids\": [\"32839316\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which HSPA2 nuclear translocation drives meiosis not resolved\", \"Whether this complex operates in oocytes not addressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified NLRP14 as a maternal regulator of epigenetic reprogramming by controlling subcellular localization of the DNA-methylation machinery.\",\n      \"evidence\": \"Maternal KO mouse with imaging of Dnmt1/Uhrf1 localization, bisulfite and genome-wide methylation profiling\",\n      \"pmids\": [\"36539615\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of how NLRP14 controls Uhrf1/Dnmt1 nuclear localization not defined here\", \"Downstream transcriptional consequences not yet mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked NLRP14 to oocyte calcium homeostasis by showing it stabilizes the mitochondrial exchanger NCLX through K27-linked ubiquitination control.\",\n      \"evidence\": \"Maternal KO mouse, proteomics, Co-IP to NCLX IDR, ubiquitination assay, and spindle/cytoplasm transfer rescue\",\n      \"pmids\": [\"37493331\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The ubiquitin ligase/deubiquitinase acting on NCLX not identified\", \"Causal hierarchy between calcium defects and UHRF1 loss not separated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated direct physical anchoring of UHRF1 by NLRP14 in oocyte cytoplasm, protecting it from proteasomal degradation and explaining maternal infertility variants.\",\n      \"evidence\": \"Maternal KO mouse, Co-IP, proteasome inhibitor rescue, nuclear/cytoplasmic fractionation, and human compound heterozygous variants\",\n      \"pmids\": [\"38060382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mechanism of the NLRP14-UHRF1 interaction not yet resolved at this stage\", \"Whether anchoring and stabilization are separable functions unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Resolved the molecular mechanism of NLRP14 as a dual E3 ligase inhibitor, distinguishing competitive (KDM2A/SCF) from allosteric (UHRF1 UBL) inhibition.\",\n      \"evidence\": \"Cryo-EM/X-ray structures of NLRP14-KDM2A-SKP1 and NLRP14-UHRF1 complexes, KO mouse showing increased oocyte ubiquitination, in vitro ubiquitination assays\",\n      \"pmids\": [\"41951593\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of E3 ligases regulated by NLRP14 in vivo not enumerated\", \"Quantitative contribution of each inhibitory mode to proteostasis not partitioned\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Placed NLRP14 as a structural subunit of the oocyte cytoplasmic lattice, integrating its UHRF1-anchoring role into a defined macromolecular architecture.\",\n      \"evidence\": \"Cryo-EM of native cytoplasmic lattice from mouse oocytes with mass-spectrometry subunit identification (UBE2D3-UHRF1-NLRP14 assembly)\",\n      \"pmids\": [\"41845018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional requirement of NLRP14 for CPL assembly versus being a passenger not tested\", \"Relationship between CPL incorporation and UHRF1 sequestration not mechanistically linked\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established UHRF1 nuclear exclusion as the causal downstream effector of NLRP14 in zygotic genome activation through genetic epistasis.\",\n      \"evidence\": \"Nlrp14 KO, Uhrf1/Nlrp14 and Dnmt1/Nlrp14 double KO with ATAC-seq, ChIP-seq, and bisulfite sequencing\",\n      \"pmids\": [\"42191687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LINE1 demethylation drives chromatin opening mechanistically not fully resolved\", \"Contribution of NLRP14's other targets (NCLX, KDM2A) to ZGA not dissected\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how NLRP14's diverse activities — immune dampening, chaperone scaffolding, calcium homeostasis, dual ligase inhibition, and cytoplasmic lattice structure — are integrated and temporally coordinated across germ cell and embryonic stages.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unifying model connecting the immune and reproductive functions\", \"Stage-specific partner switching not characterized\", \"Upstream signals controlling NLRP14 activity unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2, 3, 6]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 7]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 2, 3, 6]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [5, 8]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"NLRP14-HSPA2-BAG2 complex\", \"cytoplasmic lattice (UBE2D3-UHRF1-NLRP14 assembly)\"],\n    \"partners\": [\"TBK1\", \"HSPA2\", \"BAG2\", \"NCLX\", \"UHRF1\", \"KDM2A\", \"UBE2D3\", \"DNMT1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":7,"faith_total":7,"faith_pct":100.0}}