{"gene":"NXF2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2000,"finding":"NXF2 binds RNA, localizes to the nuclear envelope, and exhibits RNA export activity. Both human p15 homologues (NXT1 and NXT2) bind NXF2. The NTF2-like domain mediating heterodimerization with p15 and the ubiquitin-associated domain mediating nucleoporin interaction are conserved in NXF2.","method":"Functional RNA export assay, subcellular localization by fluorescence microscopy, binding assays for p15 interaction","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNA export activity assay, localization, and protein interaction assays independently replicated across multiple labs in subsequent work","pmids":["11073998"],"is_preprint":false},{"year":2001,"finding":"Depletion of Drosophila NXF2 (Dm NXF2) has no apparent phenotype on bulk mRNA export in cultured Drosophila cells, in contrast to NXF1/p15 depletion which causes robust nuclear accumulation of poly(A)+ RNA, indicating Dm NXF2 is not required for general mRNA export.","method":"RNAi depletion in Drosophila cells, fluorescence in situ hybridization for poly(A)+ RNA","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — FISH-based functional readout with RNAi depletion, clear negative result for bulk mRNA export","pmids":["11780633"],"is_preprint":false},{"year":2004,"finding":"C. elegans NXF-2 (CeNXF-2) specifically binds the TRE element of the tra-2 mRNA 3'UTR and inhibits its export via NXF-1, routing it instead through a CRM1-dependent pathway; removal of CeNXF-2 results in export of tra-2 via NXF-1.","method":"RNA binding assay (TRE element binding), genetic epistasis (NXF-2 loss-of-function), CRM1 inhibition with leptomycin B","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis combined with RNA binding assay and pharmacological inhibition, multiple orthogonal methods","pmids":["15175155"],"is_preprint":false},{"year":2005,"finding":"Mouse NXF2 localizes to the nucleus and nuclear envelope, binds phenylalanine-glycine (FG) repeat sequences of nucleoporins, heterodimerizes with p15/NXT1, and enhances nuclear export of an otherwise inefficiently exported mRNA substrate. Mouse NXF3 does not bind FG repeats and lacks mRNA export activity.","method":"GFP-tagging/subcellular localization, GST pulldown for nucleoporin binding, co-immunoprecipitation with p15/NXT1, mRNA export reporter assay","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (localization, binding assays, functional export assay) in single study","pmids":["15820316"],"is_preprint":false},{"year":2005,"finding":"Mouse NXF2 is an active mRNA export receptor expressed during brain development; it localizes to the nucleus, nuclear envelope, and cytoplasm. Mouse NXF7 localizes exclusively to cytoplasmic granules and lacks mRNA export activity despite conserved sequence.","method":"GFP-tagged protein localization, mRNA export activity assay, Western blot developmental expression analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional export assay and localization from single lab, consistent with Sasaki et al. 2005","pmids":["16027110"],"is_preprint":false},{"year":2006,"finding":"FMRP associates specifically with NXF2 but not with its close relative NXF1 in mouse male germ cells and hippocampal neurons, as shown by co-immunoprecipitation.","method":"Co-immunoprecipitation from brain and testis tissue","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single co-IP from tissue, but replicated in follow-up study by same group","pmids":["16790844"],"is_preprint":false},{"year":2007,"finding":"NXF2 interacts with the cytoplasmic motor protein KIF17 via its N-terminal domain; this interaction is required for the punctate localization of NXF2 in dendrites. NXF2-containing dendritic granules co-localize with KIF17, mRNA, and Staufen1, and move bidirectionally along dendrites in a microtubule-dependent manner.","method":"Yeast two-hybrid screening, GST pulldown, co-immunoprecipitation, live-cell fluorescence imaging of dendritic granule motility, domain deletion mapping","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — interaction confirmed by three methods (Y2H, pulldown, Co-IP), localization and motility by live imaging with domain-mapping","pmids":["17403691"],"is_preprint":false},{"year":2007,"finding":"In neuronal cells, both FMRP and NXF2 are present in Nxf1 mRNA-containing ribonucleoprotein particles; expression of NXF2 destabilizes Nxf1 mRNA, and this effect is abolished when Fmr1 is reduced by siRNA, demonstrating that FMRP and NXF2 collaborate to destabilize Nxf1 mRNA.","method":"Immunoprecipitation of mRNPs, quantitative RT-PCR, siRNA knockdown of Fmr1","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal IP-RT-PCR plus functional siRNA rescue experiment, multiple orthogonal methods in single study","pmids":["17548835"],"is_preprint":false},{"year":2009,"finding":"Nxf2 null male mice exhibit meiotic arrest and/or reduced spermatogonial proliferation depending on genetic background; inactivation causes depletion of germ cells with age, demonstrating dual roles for Nxf2 in regulation of meiosis and maintenance of spermatogonial stem cells in vivo.","method":"Targeted gene deletion (homologous recombination in ES cells), histology, sperm motility analysis, BrdU proliferation assay","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse with multiple phenotypic readouts (meiotic arrest, proliferation, motility) across two genetic backgrounds","pmids":["19345203"],"is_preprint":false},{"year":2010,"finding":"NXF2 is cleaved by Taspase1 threonine protease; bioinformatic identification followed by experimental verification using biosensor and full-length protein cleavage assays confirmed NXF2 as a bona fide Taspase1 substrate.","method":"Cell-based translocation biosensor assay, scanning mutagenesis, cleavage site verification for full-length NXF2","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional cell-based cleavage assay with mutagenesis but single lab, single study","pmids":["21084304"],"is_preprint":false},{"year":2011,"finding":"The crystal structure of C. elegans NXF2 (ceNXF2) NTF2 domain bound to ceNXT1 revealed contacts crucial for heterodimer stability and specificity, including a probable phosphoregulation site; the ceNXF2/ceNXT1 complex has at least two nucleoporin (Nup) binding pockets, one of which is formed at the heterodimer interface, demonstrating that NXT1 binding directly regulates NXF2's interaction with nucleoporins.","method":"X-ray crystallography, mutagenesis of interface residues, functional colocalization assay at nuclear envelope","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis and functional validation in single rigorous study","pmids":["22123199"],"is_preprint":false},{"year":2012,"finding":"NXF2 is required for accurate chromosome segregation in tumor cells; its depletion in non-small-cell lung cancer cells enhances multipolar spindle formation, increases mitotic transit time, induces micronucleation upon paclitaxel treatment, and disrupts microtubule stability/cytaster formation.","method":"siRNA knockdown, immunofluorescence for spindle morphology, live-cell imaging of mitosis, microtubule cytaster assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean KD with defined cellular phenotype (multiple readouts) but single lab, single study; function unexpected for an RNA export factor","pmids":["22869527"],"is_preprint":false},{"year":2019,"finding":"Drosophila Nxf2 forms the SFiNX complex with Panoramix (Panx) and Nxt1; this complex is required for Piwi-mediated co-transcriptional silencing of transposons. Nxf2 directly binds nascent transposon transcripts in a Piwi-dependent manner, and tethering Nxf2 to RNA is sufficient to silence target loci and accumulate repressive chromatin marks. Within the complex, Panoramix recruits heterochromatin effectors while Nxf2 licenses co-transcriptional silencing. Nxf2 and Panx are mutually required for each other's protein stability and localization.","method":"Co-immunoprecipitation, tethering assay (λN/BoxB system), ChIP for H3K9me3, genetic knockout (sterility/transposon derepression), protein stability assays, direct RNA binding","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (Co-IP, tethering, ChIP, KO phenotype, RNA binding) replicated across three independent labs in the same year","pmids":["31384064","31219034","31368590"],"is_preprint":false},{"year":2019,"finding":"Nxf2 forms a complex with Piwi and Panx (Panx-Nxf2-p15); ectopic targeting of Nxf2 initiates co-transcriptional repression independently of H3K9me3 or H1, but continuous silencing requires HP1a and H1. Panx-Nxf2-p15 complex formation stabilizes Nxf2 and Panx protein levels.","method":"Co-immunoprecipitation, tethering reporter assay, ChIP for H3K9me3 and H1, genetic epistasis with HP1a/H1 mutants","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — tethering assay with epistasis experiments and ChIP, independently corroborating findings of Batki et al. and Fabry et al. 2019","pmids":["31368590"],"is_preprint":false},{"year":2019,"finding":"The N-terminal portion of Panoramix is sufficient to induce transcriptional silencing; Nxf2 and Panx proteins are mutually required for proper localization and stability. Domain mapping identified the protein domains crucial for Nxf2/Panx complex formation.","method":"Domain deletion/truncation analysis, co-immunoprecipitation, protein stability assays, tethering reporter assay","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — domain mapping with functional reporter assay plus stability assays, multiple orthogonal methods","pmids":["31219034"],"is_preprint":false},{"year":2021,"finding":"The dynein light chain LC8/Cut-up (Ctp) is an essential component of the PICTS complex (containing Panoramix, Nxf2, and Nxt1); Ctp drives dimerisation of the PICTS complex through interaction with conserved motifs in Panoramix, and artificial dimerisation of Panoramix bypasses the need for Ctp, demonstrating dimerisation is the key function of Ctp in this silencing complex.","method":"Co-immunoprecipitation, genetic knockout (transposon derepression, loss of H3K9me3), tethering assay, artificial dimerization rescue experiment","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic rescue (artificial dimerization), ChIP, Co-IP, and tethering provide mechanistic evidence from multiple orthogonal approaches","pmids":["33538693"],"is_preprint":false},{"year":2021,"finding":"Piwi/Nxf2-dependent recruitment of piRNA target loci to nuclear lamins was demonstrated; depletion of Piwi or Nxf2 decreases intra-TAD and increases inter-TAD interactions at TE-harboring regions, indicating Nxf2 participates in nuclear architectural changes required for transcriptional silencing.","method":"ChEP (chromatin enrichment for proteomics), DamID-seq for lamin association, Hi-C chromatin conformation capture, forced tethering system","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Hi-C, DamID-seq, and tethering provide multi-level mechanistic evidence from single rigorous study","pmids":["34337769"],"is_preprint":false},{"year":2022,"finding":"C. elegans NXF-2 is specifically expressed in germ cells and forms a novel granular structure anchored to the nuclear periphery in the mitotic region of the gonad via XPO-1/CRM1-dependent activity; in the meiotic region NXF-2 granules are released to the cytoplasm. Inhibition of NXF-2 causes nuclear accumulation of tra-2 3'UTR-containing reporter mRNA, demonstrating NXF-2 is required for export of tra-2 mRNA via its 3'UTR.","method":"Immunofluorescence/live imaging for granule localization, CRM1 inhibition (leptomycin B equivalent), NES mutation, RNAi knockdown with reporter mRNA export assay","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (localization imaging, pharmacological inhibition, mutagenesis, functional mRNA export assay) in single study","pmids":["35950937"],"is_preprint":false},{"year":2025,"finding":"NXT2 binds NXF2 in vivo in human testis; this interaction is mediated by the NTF2-like domain of NXT2. NXF2 thus participates in the nuclear RNA export machinery as an NXT2-binding partner in the human testis.","method":"Co-immunoprecipitation (in vivo interaction), domain binding assay (NTF2-like domain of NXT2)","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — reciprocal Co-IP with domain mapping, single study, peer-reviewed","pmids":["40624043"],"is_preprint":false}],"current_model":"NXF2 (CT39/TAPL-2) is a nuclear RNA export factor family member that heterodimerizes with NXT1/p15 via its NTF2-like domain and binds nucleoporins to support mRNA nuclear export; in neurons it further interacts with the kinesin KIF17 to transport mRNA bidirectionally in dendrites and collaborates with FMRP to destabilize Nxf1 mRNA; in the germline it is essential for spermatogenesis (meiosis and spermatogonial stem cell maintenance); and in Drosophila it has been co-opted as the RNA-binding arm of the PICTS/SFiNX complex—together with Panoramix, Nxt1, and LC8/Cut-up—where it directly binds nascent transposon transcripts in a Piwi-dependent manner to initiate co-transcriptional heterochromatin silencing and nuclear lamina tethering of transposon loci."},"narrative":{"mechanistic_narrative":"NXF2 is a member of the nuclear RNA export factor family that operates as a sequence- and context-selective mRNA export receptor, having diverged from the bulk-export role of NXF1 toward specialized regulatory functions in the germline, neurons, and—in Drosophila—transposon silencing [PMID:11073998, PMID:11780633, PMID:15175155]. Through a conserved NTF2-like domain it heterodimerizes with the p15 cofactors NXT1/NXT2, and through a ubiquitin-associated domain it contacts the FG-repeats of nucleoporins, an arrangement that supports nuclear-envelope localization and export of otherwise inefficiently exported transcripts [PMID:11073998, PMID:15820316]; the crystal structure of the NTF2-domain/NXT1 complex shows that p15 binding directly licenses nucleoporin engagement, with a Nup-binding pocket formed at the heterodimer interface [PMID:22123199]. Unlike NXF1, NXF2 does not drive bulk poly(A)+ RNA export and instead acts on defined substrates: in C. elegans it binds the TRE element of the tra-2 3'UTR and routes that mRNA away from NXF1-dependent export, partitioning between a nuclear-periphery granule pool and the cytoplasm in a CRM1/XPO-1-dependent manner across the germline [PMID:15175155, PMID:35950937]. In mammals NXF2 is required for spermatogenesis, with knockout mice showing meiotic arrest and failure to maintain spermatogonial stem cells [PMID:19345203], and in neurons it couples to the kinesin KIF17 to form motile dendritic RNP granules and collaborates with FMRP to destabilize Nxf1 mRNA [PMID:17403691, PMID:17548835]. In Drosophila, NXF2 has been co-opted as the RNA-binding subunit of the SFiNX/PICTS complex with Panoramix, Nxt1/p15, and the dynein light chain LC8/Cut-up, where it directly binds nascent transposon transcripts in a Piwi-dependent manner to initiate co-transcriptional heterochromatin silencing, deposition of H3K9me3, and tethering of target loci to the nuclear lamina [PMID:31384064, PMID:31219034, PMID:31368590, PMID:33538693, PMID:34337769].","teleology":[{"year":2000,"claim":"Established NXF2 as a bona fide member of the NXF export-receptor family by showing it binds RNA, localizes to the nuclear envelope, has RNA export activity, and uses conserved NTF2-like and UBA domains to bind p15 and nucleoporins.","evidence":"RNA export assay, fluorescence localization, and p15/NXT binding assays in human cells","pmids":["11073998"],"confidence":"High","gaps":["Did not define which transcripts NXF2 selectively exports versus NXF1","No in vivo or tissue-specific role established"]},{"year":2001,"claim":"Distinguished NXF2 from NXF1 functionally by showing Drosophila Nxf2 is dispensable for bulk mRNA export, pointing to a specialized rather than housekeeping role.","evidence":"RNAi depletion and poly(A)+ FISH in Drosophila cells","pmids":["11780633"],"confidence":"High","gaps":["Did not identify the specialized substrates or pathway NXF2 acts in","Negative result does not exclude tissue-specific export roles"]},{"year":2004,"claim":"Defined the first specific NXF2 substrate and a regulatory logic: rather than exporting mRNA, C. elegans NXF-2 binds the tra-2 3'UTR TRE element to block NXF-1 export and reroute the transcript through CRM1.","evidence":"RNA-binding assay, genetic epistasis, and leptomycin B inhibition in C. elegans","pmids":["15175155"],"confidence":"High","gaps":["Whether mammalian NXF2 uses analogous 3'UTR-element recognition unknown","Structural basis of TRE recognition not defined"]},{"year":2005,"claim":"Confirmed mammalian NXF2 as an active, paralog-distinct export receptor by demonstrating FG-nucleoporin binding, p15/NXT1 heterodimerization, and export of an inefficient substrate, while related NXF3/NXF7 lack these activities.","evidence":"Localization, GST pulldown, Co-IP, and mRNA export reporter assays in mouse cells with developmental expression profiling","pmids":["15820316","16027110"],"confidence":"High","gaps":["Endogenous mammalian NXF2 cargoes not identified","Functional significance of brain expression not addressed at this stage"]},{"year":2006,"claim":"Linked NXF2 to FMRP biology by showing FMRP associates specifically with NXF2 and not NXF1 in germ cells and neurons, nominating a tissue-specific regulatory partnership.","evidence":"Co-immunoprecipitation from mouse brain and testis","pmids":["16790844"],"confidence":"Medium","gaps":["Single Co-IP from tissue without reciprocal mapping of the interaction interface","Functional consequence of the FMRP–NXF2 association not yet shown"]},{"year":2007,"claim":"Resolved a neuronal function for NXF2: it links to the kinesin KIF17 for bidirectional dendritic mRNP transport and, with FMRP, destabilizes Nxf1 mRNA, establishing NXF2 as a post-transcriptional regulator of its own paralog.","evidence":"Y2H, GST pulldown, Co-IP, live-cell granule imaging, mRNP IP-RT-PCR, and Fmr1 siRNA rescue in neuronal cells","pmids":["17403691","17548835"],"confidence":"High","gaps":["Mechanism by which the NXF2/FMRP complex triggers Nxf1 mRNA decay not defined","Full transcript set transported in dendritic granules unknown"]},{"year":2009,"claim":"Demonstrated an essential in vivo requirement for NXF2 in the germline, separating roles in meiotic progression and spermatogonial stem cell maintenance.","evidence":"Nxf2-null mouse with histology, proliferation, and motility readouts across two genetic backgrounds","pmids":["19345203"],"confidence":"High","gaps":["Molecular cargoes or targets underlying the spermatogenic defect not identified","Whether the phenotype reflects export, mRNA stability, or another activity unresolved"]},{"year":2010,"claim":"Identified NXF2 as a Taspase1 protease substrate, raising the possibility of regulated proteolytic processing of the export factor.","evidence":"Cell-based translocation biosensor, scanning mutagenesis, and full-length cleavage verification","pmids":["21084304"],"confidence":"Medium","gaps":["Functional consequence of cleavage for export or other activities not established","Single lab, single study"]},{"year":2011,"claim":"Provided the structural basis for NXF2 heterodimer assembly and export licensing, showing the NTF2/NXT1 interface itself forms a nucleoporin-binding pocket so that p15 binding directly gates Nup engagement.","evidence":"X-ray crystallography of the ceNXF2 NTF2 domain bound to ceNXT1 with interface mutagenesis and nuclear-envelope colocalization","pmids":["22123199"],"confidence":"High","gaps":["Structure of the RNA-binding and UBA regions not solved","Whether the predicted phosphoregulation site is used in vivo unknown"]},{"year":2012,"claim":"Reported an unexpected mitotic function in tumor cells, where NXF2 depletion disrupts spindle integrity and chromosome segregation.","evidence":"siRNA knockdown with spindle immunofluorescence, mitotic live imaging, and microtubule cytaster assays in NSCLC cells","pmids":["22869527"],"confidence":"Medium","gaps":["Mechanistic link between RNA export activity and spindle/microtubule control not defined","Single lab, single study; function atypical for an NXF protein"]},{"year":2019,"claim":"Redefined Drosophila Nxf2 as the RNA-binding arm of the SFiNX/Panx-Nxf2-p15 complex, showing it directly binds nascent transposon transcripts Piwi-dependently and that RNA-tethering of Nxf2 is sufficient to initiate co-transcriptional silencing, with Panoramix recruiting heterochromatin effectors and the two proteins stabilizing each other.","evidence":"Co-IP, λN/BoxB tethering, ChIP for H3K9me3/H1, genetic knockouts, protein stability and domain-mapping assays across three independent labs","pmids":["31384064","31219034","31368590"],"confidence":"High","gaps":["How Nxf2 'licenses' silencing mechanistically beyond RNA tethering not resolved","Whether mammalian NXF2 has any analogous chromatin-silencing role unknown"]},{"year":2021,"claim":"Extended the silencing model by showing the dynein light chain LC8/Cut-up dimerizes the PICTS complex—dimerization being its essential function—and that Nxf2/Piwi drive recruitment of target loci to the nuclear lamina and reorganize TAD architecture.","evidence":"Co-IP, knockouts, tethering, artificial dimerization rescue, ChEP, DamID-seq, and Hi-C in Drosophila","pmids":["33538693","34337769"],"confidence":"High","gaps":["Structural geometry of the dimerized complex on chromatin not solved","Causal order between lamina tethering and chromatin mark deposition not fully resolved"]},{"year":2022,"claim":"Refined the germline export model in C. elegans, showing NXF-2 forms nuclear-periphery granules in the mitotic gonad in a CRM1/XPO-1-dependent manner and is required for tra-2 mRNA export via its 3'UTR.","evidence":"Live imaging of granules, CRM1 inhibition, NES mutation, and RNAi with reporter export assay in C. elegans gonad","pmids":["35950937"],"confidence":"High","gaps":["Composition of the NXF-2 granules not defined","How granule release in the meiotic region is triggered unknown"]},{"year":2025,"claim":"Reaffirmed NXF2's role in the human testis export machinery by demonstrating an in vivo NXT2 interaction mediated by NXT2's NTF2-like domain.","evidence":"Co-immunoprecipitation and domain binding assay from human testis","pmids":["40624043"],"confidence":"Medium","gaps":["Endogenous human testis cargoes of NXF2 not identified","Single study with reciprocal Co-IP but no functional export readout in human tissue"]},{"year":null,"claim":"It remains unknown whether mammalian NXF2 possesses a chromatin-silencing or transposon-control activity analogous to the Drosophila SFiNX/PICTS pathway, and what the endogenous RNA cargoes are that underlie its germline and neuronal requirements.","evidence":"","pmids":[],"confidence":"Low","gaps":["No mammalian Panoramix ortholog or equivalent silencing complex defined in the corpus","Direct endogenous cargo transcripts of mammalian NXF2 not catalogued"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,2,3,12]},{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,3,4,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[12,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,7]}],"localization":[{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[0,3,4,17]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,6,17]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[12,16]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,2,3]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,3,17]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[12,13,16]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[8]}],"complexes":["SFiNX/PICTS complex (Panoramix-Nxf2-Nxt1/p15-LC8/Cut-up)","NXF2/NXT1 (p15) heterodimer"],"partners":["NXT1","NXT2","PANORAMIX","PIWI","KIF17","FMRP","LC8/CUT-UP","STAUFEN1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9GZY0","full_name":"Nuclear RNA export factor 2","aliases":["Cancer/testis antigen 39","CT39","TAP-like protein 2","TAPL-2"],"length_aa":626,"mass_kda":71.6,"function":"Involved in the export of mRNA from the nucleus to the cytoplasm","subcellular_location":"Nucleus, nucleoplasm; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9GZY0/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NXF2"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NXF2","total_profiled":1310},"omim":[{"mim_id":"602647","title":"NUCLEAR RNA EXPORT FACTOR 1; NXF1","url":"https://www.omim.org/entry/602647"},{"mim_id":"309550","title":"FRAGILE X MESSENGER RIBONUCLEOPROTEIN 1; FMR1","url":"https://www.omim.org/entry/309550"},{"mim_id":"300320","title":"NTF2-LIKE EXPORT FACTOR 2; NXT2","url":"https://www.omim.org/entry/300320"},{"mim_id":"300319","title":"NUCLEAR RNA EXPORT FACTOR 5; NXF5","url":"https://www.omim.org/entry/300319"},{"mim_id":"300318","title":"NUCLEAR RNA EXPORT FACTOR 4; NXF4","url":"https://www.omim.org/entry/300318"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"epididymis","ntpm":14.3},{"tissue":"testis","ntpm":10.2}],"url":"https://www.proteinatlas.org/search/NXF2"},"hgnc":{"alias_symbol":["CT39","TAPL-2"],"prev_symbol":[]},"alphafold":{"accession":"Q9GZY0","domains":[{"cath_id":"3.30.70.330","chopping":"125-204","consensus_level":"high","plddt":91.0442,"start":125,"end":204},{"cath_id":"3.80.10.10","chopping":"209-361","consensus_level":"high","plddt":94.2964,"start":209,"end":361},{"cath_id":"3.10.450.50","chopping":"387-428_436-552","consensus_level":"high","plddt":90.3769,"start":387,"end":552},{"cath_id":"1.10.8.10","chopping":"571-622","consensus_level":"high","plddt":90.3031,"start":571,"end":622}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZY0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZY0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZY0-F1-predicted_aligned_error_v6.png","plddt_mean":76.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NXF2","jax_strain_url":"https://www.jax.org/strain/search?query=NXF2"},"sequence":{"accession":"Q9GZY0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9GZY0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9GZY0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZY0"}},"corpus_meta":[{"pmid":"11073998","id":"PMC_11073998","title":"TAP (NXF1) belongs to a multigene family of putative RNA export factors with a conserved modular architecture.","date":"2000","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/11073998","citation_count":173,"is_preprint":false},{"pmid":"28342986","id":"PMC_28342986","title":"Oncogenic roles of DNA hypomethylation through the activation of cancer-germline genes.","date":"2017","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/28342986","citation_count":159,"is_preprint":false},{"pmid":"11780633","id":"PMC_11780633","title":"NXF1/p15 heterodimers are essential for mRNA nuclear export in Drosophila.","date":"2001","source":"RNA (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/11780633","citation_count":144,"is_preprint":false},{"pmid":"21437249","id":"PMC_21437249","title":"Multiple cancer/testis antigens are preferentially expressed in hormone-receptor negative and high-grade breast cancers.","date":"2011","source":"PloS 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Both human p15 homologues (NXT1 and NXT2) bind NXF2. The NTF2-like domain mediating heterodimerization with p15 and the ubiquitin-associated domain mediating nucleoporin interaction are conserved in NXF2.\",\n      \"method\": \"Functional RNA export assay, subcellular localization by fluorescence microscopy, binding assays for p15 interaction\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNA export activity assay, localization, and protein interaction assays independently replicated across multiple labs in subsequent work\",\n      \"pmids\": [\"11073998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Depletion of Drosophila NXF2 (Dm NXF2) has no apparent phenotype on bulk mRNA export in cultured Drosophila cells, in contrast to NXF1/p15 depletion which causes robust nuclear accumulation of poly(A)+ RNA, indicating Dm NXF2 is not required for general mRNA export.\",\n      \"method\": \"RNAi depletion in Drosophila cells, fluorescence in situ hybridization for poly(A)+ RNA\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — FISH-based functional readout with RNAi depletion, clear negative result for bulk mRNA export\",\n      \"pmids\": [\"11780633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"C. elegans NXF-2 (CeNXF-2) specifically binds the TRE element of the tra-2 mRNA 3'UTR and inhibits its export via NXF-1, routing it instead through a CRM1-dependent pathway; removal of CeNXF-2 results in export of tra-2 via NXF-1.\",\n      \"method\": \"RNA binding assay (TRE element binding), genetic epistasis (NXF-2 loss-of-function), CRM1 inhibition with leptomycin B\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis combined with RNA binding assay and pharmacological inhibition, multiple orthogonal methods\",\n      \"pmids\": [\"15175155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mouse NXF2 localizes to the nucleus and nuclear envelope, binds phenylalanine-glycine (FG) repeat sequences of nucleoporins, heterodimerizes with p15/NXT1, and enhances nuclear export of an otherwise inefficiently exported mRNA substrate. Mouse NXF3 does not bind FG repeats and lacks mRNA export activity.\",\n      \"method\": \"GFP-tagging/subcellular localization, GST pulldown for nucleoporin binding, co-immunoprecipitation with p15/NXT1, mRNA export reporter assay\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (localization, binding assays, functional export assay) in single study\",\n      \"pmids\": [\"15820316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mouse NXF2 is an active mRNA export receptor expressed during brain development; it localizes to the nucleus, nuclear envelope, and cytoplasm. Mouse NXF7 localizes exclusively to cytoplasmic granules and lacks mRNA export activity despite conserved sequence.\",\n      \"method\": \"GFP-tagged protein localization, mRNA export activity assay, Western blot developmental expression analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional export assay and localization from single lab, consistent with Sasaki et al. 2005\",\n      \"pmids\": [\"16027110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FMRP associates specifically with NXF2 but not with its close relative NXF1 in mouse male germ cells and hippocampal neurons, as shown by co-immunoprecipitation.\",\n      \"method\": \"Co-immunoprecipitation from brain and testis tissue\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single co-IP from tissue, but replicated in follow-up study by same group\",\n      \"pmids\": [\"16790844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NXF2 interacts with the cytoplasmic motor protein KIF17 via its N-terminal domain; this interaction is required for the punctate localization of NXF2 in dendrites. NXF2-containing dendritic granules co-localize with KIF17, mRNA, and Staufen1, and move bidirectionally along dendrites in a microtubule-dependent manner.\",\n      \"method\": \"Yeast two-hybrid screening, GST pulldown, co-immunoprecipitation, live-cell fluorescence imaging of dendritic granule motility, domain deletion mapping\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interaction confirmed by three methods (Y2H, pulldown, Co-IP), localization and motility by live imaging with domain-mapping\",\n      \"pmids\": [\"17403691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In neuronal cells, both FMRP and NXF2 are present in Nxf1 mRNA-containing ribonucleoprotein particles; expression of NXF2 destabilizes Nxf1 mRNA, and this effect is abolished when Fmr1 is reduced by siRNA, demonstrating that FMRP and NXF2 collaborate to destabilize Nxf1 mRNA.\",\n      \"method\": \"Immunoprecipitation of mRNPs, quantitative RT-PCR, siRNA knockdown of Fmr1\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal IP-RT-PCR plus functional siRNA rescue experiment, multiple orthogonal methods in single study\",\n      \"pmids\": [\"17548835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Nxf2 null male mice exhibit meiotic arrest and/or reduced spermatogonial proliferation depending on genetic background; inactivation causes depletion of germ cells with age, demonstrating dual roles for Nxf2 in regulation of meiosis and maintenance of spermatogonial stem cells in vivo.\",\n      \"method\": \"Targeted gene deletion (homologous recombination in ES cells), histology, sperm motility analysis, BrdU proliferation assay\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout mouse with multiple phenotypic readouts (meiotic arrest, proliferation, motility) across two genetic backgrounds\",\n      \"pmids\": [\"19345203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NXF2 is cleaved by Taspase1 threonine protease; bioinformatic identification followed by experimental verification using biosensor and full-length protein cleavage assays confirmed NXF2 as a bona fide Taspase1 substrate.\",\n      \"method\": \"Cell-based translocation biosensor assay, scanning mutagenesis, cleavage site verification for full-length NXF2\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional cell-based cleavage assay with mutagenesis but single lab, single study\",\n      \"pmids\": [\"21084304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The crystal structure of C. elegans NXF2 (ceNXF2) NTF2 domain bound to ceNXT1 revealed contacts crucial for heterodimer stability and specificity, including a probable phosphoregulation site; the ceNXF2/ceNXT1 complex has at least two nucleoporin (Nup) binding pockets, one of which is formed at the heterodimer interface, demonstrating that NXT1 binding directly regulates NXF2's interaction with nucleoporins.\",\n      \"method\": \"X-ray crystallography, mutagenesis of interface residues, functional colocalization assay at nuclear envelope\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis and functional validation in single rigorous study\",\n      \"pmids\": [\"22123199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NXF2 is required for accurate chromosome segregation in tumor cells; its depletion in non-small-cell lung cancer cells enhances multipolar spindle formation, increases mitotic transit time, induces micronucleation upon paclitaxel treatment, and disrupts microtubule stability/cytaster formation.\",\n      \"method\": \"siRNA knockdown, immunofluorescence for spindle morphology, live-cell imaging of mitosis, microtubule cytaster assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean KD with defined cellular phenotype (multiple readouts) but single lab, single study; function unexpected for an RNA export factor\",\n      \"pmids\": [\"22869527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Drosophila Nxf2 forms the SFiNX complex with Panoramix (Panx) and Nxt1; this complex is required for Piwi-mediated co-transcriptional silencing of transposons. Nxf2 directly binds nascent transposon transcripts in a Piwi-dependent manner, and tethering Nxf2 to RNA is sufficient to silence target loci and accumulate repressive chromatin marks. Within the complex, Panoramix recruits heterochromatin effectors while Nxf2 licenses co-transcriptional silencing. Nxf2 and Panx are mutually required for each other's protein stability and localization.\",\n      \"method\": \"Co-immunoprecipitation, tethering assay (λN/BoxB system), ChIP for H3K9me3, genetic knockout (sterility/transposon derepression), protein stability assays, direct RNA binding\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (Co-IP, tethering, ChIP, KO phenotype, RNA binding) replicated across three independent labs in the same year\",\n      \"pmids\": [\"31384064\", \"31219034\", \"31368590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Nxf2 forms a complex with Piwi and Panx (Panx-Nxf2-p15); ectopic targeting of Nxf2 initiates co-transcriptional repression independently of H3K9me3 or H1, but continuous silencing requires HP1a and H1. Panx-Nxf2-p15 complex formation stabilizes Nxf2 and Panx protein levels.\",\n      \"method\": \"Co-immunoprecipitation, tethering reporter assay, ChIP for H3K9me3 and H1, genetic epistasis with HP1a/H1 mutants\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tethering assay with epistasis experiments and ChIP, independently corroborating findings of Batki et al. and Fabry et al. 2019\",\n      \"pmids\": [\"31368590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The N-terminal portion of Panoramix is sufficient to induce transcriptional silencing; Nxf2 and Panx proteins are mutually required for proper localization and stability. Domain mapping identified the protein domains crucial for Nxf2/Panx complex formation.\",\n      \"method\": \"Domain deletion/truncation analysis, co-immunoprecipitation, protein stability assays, tethering reporter assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with functional reporter assay plus stability assays, multiple orthogonal methods\",\n      \"pmids\": [\"31219034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The dynein light chain LC8/Cut-up (Ctp) is an essential component of the PICTS complex (containing Panoramix, Nxf2, and Nxt1); Ctp drives dimerisation of the PICTS complex through interaction with conserved motifs in Panoramix, and artificial dimerisation of Panoramix bypasses the need for Ctp, demonstrating dimerisation is the key function of Ctp in this silencing complex.\",\n      \"method\": \"Co-immunoprecipitation, genetic knockout (transposon derepression, loss of H3K9me3), tethering assay, artificial dimerization rescue experiment\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic rescue (artificial dimerization), ChIP, Co-IP, and tethering provide mechanistic evidence from multiple orthogonal approaches\",\n      \"pmids\": [\"33538693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Piwi/Nxf2-dependent recruitment of piRNA target loci to nuclear lamins was demonstrated; depletion of Piwi or Nxf2 decreases intra-TAD and increases inter-TAD interactions at TE-harboring regions, indicating Nxf2 participates in nuclear architectural changes required for transcriptional silencing.\",\n      \"method\": \"ChEP (chromatin enrichment for proteomics), DamID-seq for lamin association, Hi-C chromatin conformation capture, forced tethering system\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Hi-C, DamID-seq, and tethering provide multi-level mechanistic evidence from single rigorous study\",\n      \"pmids\": [\"34337769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"C. elegans NXF-2 is specifically expressed in germ cells and forms a novel granular structure anchored to the nuclear periphery in the mitotic region of the gonad via XPO-1/CRM1-dependent activity; in the meiotic region NXF-2 granules are released to the cytoplasm. Inhibition of NXF-2 causes nuclear accumulation of tra-2 3'UTR-containing reporter mRNA, demonstrating NXF-2 is required for export of tra-2 mRNA via its 3'UTR.\",\n      \"method\": \"Immunofluorescence/live imaging for granule localization, CRM1 inhibition (leptomycin B equivalent), NES mutation, RNAi knockdown with reporter mRNA export assay\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (localization imaging, pharmacological inhibition, mutagenesis, functional mRNA export assay) in single study\",\n      \"pmids\": [\"35950937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NXT2 binds NXF2 in vivo in human testis; this interaction is mediated by the NTF2-like domain of NXT2. NXF2 thus participates in the nuclear RNA export machinery as an NXT2-binding partner in the human testis.\",\n      \"method\": \"Co-immunoprecipitation (in vivo interaction), domain binding assay (NTF2-like domain of NXT2)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — reciprocal Co-IP with domain mapping, single study, peer-reviewed\",\n      \"pmids\": [\"40624043\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NXF2 (CT39/TAPL-2) is a nuclear RNA export factor family member that heterodimerizes with NXT1/p15 via its NTF2-like domain and binds nucleoporins to support mRNA nuclear export; in neurons it further interacts with the kinesin KIF17 to transport mRNA bidirectionally in dendrites and collaborates with FMRP to destabilize Nxf1 mRNA; in the germline it is essential for spermatogenesis (meiosis and spermatogonial stem cell maintenance); and in Drosophila it has been co-opted as the RNA-binding arm of the PICTS/SFiNX complex—together with Panoramix, Nxt1, and LC8/Cut-up—where it directly binds nascent transposon transcripts in a Piwi-dependent manner to initiate co-transcriptional heterochromatin silencing and nuclear lamina tethering of transposon loci.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NXF2 is a member of the nuclear RNA export factor family that operates as a sequence- and context-selective mRNA export receptor, having diverged from the bulk-export role of NXF1 toward specialized regulatory functions in the germline, neurons, and—in Drosophila—transposon silencing [#0, #1, #2]. Through a conserved NTF2-like domain it heterodimerizes with the p15 cofactors NXT1/NXT2, and through a ubiquitin-associated domain it contacts the FG-repeats of nucleoporins, an arrangement that supports nuclear-envelope localization and export of otherwise inefficiently exported transcripts [#0, #3]; the crystal structure of the NTF2-domain/NXT1 complex shows that p15 binding directly licenses nucleoporin engagement, with a Nup-binding pocket formed at the heterodimer interface [#10]. Unlike NXF1, NXF2 does not drive bulk poly(A)+ RNA export and instead acts on defined substrates: in C. elegans it binds the TRE element of the tra-2 3'UTR and routes that mRNA away from NXF1-dependent export, partitioning between a nuclear-periphery granule pool and the cytoplasm in a CRM1/XPO-1-dependent manner across the germline [#2, #17]. In mammals NXF2 is required for spermatogenesis, with knockout mice showing meiotic arrest and failure to maintain spermatogonial stem cells [#8], and in neurons it couples to the kinesin KIF17 to form motile dendritic RNP granules and collaborates with FMRP to destabilize Nxf1 mRNA [#6, #7]. In Drosophila, NXF2 has been co-opted as the RNA-binding subunit of the SFiNX/PICTS complex with Panoramix, Nxt1/p15, and the dynein light chain LC8/Cut-up, where it directly binds nascent transposon transcripts in a Piwi-dependent manner to initiate co-transcriptional heterochromatin silencing, deposition of H3K9me3, and tethering of target loci to the nuclear lamina [#12, #13, #15, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established NXF2 as a bona fide member of the NXF export-receptor family by showing it binds RNA, localizes to the nuclear envelope, has RNA export activity, and uses conserved NTF2-like and UBA domains to bind p15 and nucleoporins.\",\n      \"evidence\": \"RNA export assay, fluorescence localization, and p15/NXT binding assays in human cells\",\n      \"pmids\": [\"11073998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define which transcripts NXF2 selectively exports versus NXF1\", \"No in vivo or tissue-specific role established\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Distinguished NXF2 from NXF1 functionally by showing Drosophila Nxf2 is dispensable for bulk mRNA export, pointing to a specialized rather than housekeeping role.\",\n      \"evidence\": \"RNAi depletion and poly(A)+ FISH in Drosophila cells\",\n      \"pmids\": [\"11780633\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the specialized substrates or pathway NXF2 acts in\", \"Negative result does not exclude tissue-specific export roles\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the first specific NXF2 substrate and a regulatory logic: rather than exporting mRNA, C. elegans NXF-2 binds the tra-2 3'UTR TRE element to block NXF-1 export and reroute the transcript through CRM1.\",\n      \"evidence\": \"RNA-binding assay, genetic epistasis, and leptomycin B inhibition in C. elegans\",\n      \"pmids\": [\"15175155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mammalian NXF2 uses analogous 3'UTR-element recognition unknown\", \"Structural basis of TRE recognition not defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Confirmed mammalian NXF2 as an active, paralog-distinct export receptor by demonstrating FG-nucleoporin binding, p15/NXT1 heterodimerization, and export of an inefficient substrate, while related NXF3/NXF7 lack these activities.\",\n      \"evidence\": \"Localization, GST pulldown, Co-IP, and mRNA export reporter assays in mouse cells with developmental expression profiling\",\n      \"pmids\": [\"15820316\", \"16027110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous mammalian NXF2 cargoes not identified\", \"Functional significance of brain expression not addressed at this stage\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked NXF2 to FMRP biology by showing FMRP associates specifically with NXF2 and not NXF1 in germ cells and neurons, nominating a tissue-specific regulatory partnership.\",\n      \"evidence\": \"Co-immunoprecipitation from mouse brain and testis\",\n      \"pmids\": [\"16790844\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP from tissue without reciprocal mapping of the interaction interface\", \"Functional consequence of the FMRP–NXF2 association not yet shown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved a neuronal function for NXF2: it links to the kinesin KIF17 for bidirectional dendritic mRNP transport and, with FMRP, destabilizes Nxf1 mRNA, establishing NXF2 as a post-transcriptional regulator of its own paralog.\",\n      \"evidence\": \"Y2H, GST pulldown, Co-IP, live-cell granule imaging, mRNP IP-RT-PCR, and Fmr1 siRNA rescue in neuronal cells\",\n      \"pmids\": [\"17403691\", \"17548835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which the NXF2/FMRP complex triggers Nxf1 mRNA decay not defined\", \"Full transcript set transported in dendritic granules unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated an essential in vivo requirement for NXF2 in the germline, separating roles in meiotic progression and spermatogonial stem cell maintenance.\",\n      \"evidence\": \"Nxf2-null mouse with histology, proliferation, and motility readouts across two genetic backgrounds\",\n      \"pmids\": [\"19345203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular cargoes or targets underlying the spermatogenic defect not identified\", \"Whether the phenotype reflects export, mRNA stability, or another activity unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified NXF2 as a Taspase1 protease substrate, raising the possibility of regulated proteolytic processing of the export factor.\",\n      \"evidence\": \"Cell-based translocation biosensor, scanning mutagenesis, and full-length cleavage verification\",\n      \"pmids\": [\"21084304\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of cleavage for export or other activities not established\", \"Single lab, single study\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided the structural basis for NXF2 heterodimer assembly and export licensing, showing the NTF2/NXT1 interface itself forms a nucleoporin-binding pocket so that p15 binding directly gates Nup engagement.\",\n      \"evidence\": \"X-ray crystallography of the ceNXF2 NTF2 domain bound to ceNXT1 with interface mutagenesis and nuclear-envelope colocalization\",\n      \"pmids\": [\"22123199\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the RNA-binding and UBA regions not solved\", \"Whether the predicted phosphoregulation site is used in vivo unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Reported an unexpected mitotic function in tumor cells, where NXF2 depletion disrupts spindle integrity and chromosome segregation.\",\n      \"evidence\": \"siRNA knockdown with spindle immunofluorescence, mitotic live imaging, and microtubule cytaster assays in NSCLC cells\",\n      \"pmids\": [\"22869527\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between RNA export activity and spindle/microtubule control not defined\", \"Single lab, single study; function atypical for an NXF protein\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Redefined Drosophila Nxf2 as the RNA-binding arm of the SFiNX/Panx-Nxf2-p15 complex, showing it directly binds nascent transposon transcripts Piwi-dependently and that RNA-tethering of Nxf2 is sufficient to initiate co-transcriptional silencing, with Panoramix recruiting heterochromatin effectors and the two proteins stabilizing each other.\",\n      \"evidence\": \"Co-IP, λN/BoxB tethering, ChIP for H3K9me3/H1, genetic knockouts, protein stability and domain-mapping assays across three independent labs\",\n      \"pmids\": [\"31384064\", \"31219034\", \"31368590\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Nxf2 'licenses' silencing mechanistically beyond RNA tethering not resolved\", \"Whether mammalian NXF2 has any analogous chromatin-silencing role unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended the silencing model by showing the dynein light chain LC8/Cut-up dimerizes the PICTS complex—dimerization being its essential function—and that Nxf2/Piwi drive recruitment of target loci to the nuclear lamina and reorganize TAD architecture.\",\n      \"evidence\": \"Co-IP, knockouts, tethering, artificial dimerization rescue, ChEP, DamID-seq, and Hi-C in Drosophila\",\n      \"pmids\": [\"33538693\", \"34337769\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural geometry of the dimerized complex on chromatin not solved\", \"Causal order between lamina tethering and chromatin mark deposition not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Refined the germline export model in C. elegans, showing NXF-2 forms nuclear-periphery granules in the mitotic gonad in a CRM1/XPO-1-dependent manner and is required for tra-2 mRNA export via its 3'UTR.\",\n      \"evidence\": \"Live imaging of granules, CRM1 inhibition, NES mutation, and RNAi with reporter export assay in C. elegans gonad\",\n      \"pmids\": [\"35950937\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Composition of the NXF-2 granules not defined\", \"How granule release in the meiotic region is triggered unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Reaffirmed NXF2's role in the human testis export machinery by demonstrating an in vivo NXT2 interaction mediated by NXT2's NTF2-like domain.\",\n      \"evidence\": \"Co-immunoprecipitation and domain binding assay from human testis\",\n      \"pmids\": [\"40624043\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous human testis cargoes of NXF2 not identified\", \"Single study with reciprocal Co-IP but no functional export readout in human tissue\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown whether mammalian NXF2 possesses a chromatin-silencing or transposon-control activity analogous to the Drosophila SFiNX/PICTS pathway, and what the endogenous RNA cargoes are that underlie its germline and neuronal requirements.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No mammalian Panoramix ortholog or equivalent silencing complex defined in the corpus\", \"Direct endogenous cargo transcripts of mammalian NXF2 not catalogued\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 2, 3, 12]},\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 3, 4, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [12, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [0, 3, 4, 17]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 6, 17]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [12, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 3, 17]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [12, 13, 16]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\"SFiNX/PICTS complex (Panoramix-Nxf2-Nxt1/p15-LC8/Cut-up)\", \"NXF2/NXT1 (p15) heterodimer\"],\n    \"partners\": [\"NXT1\", \"NXT2\", \"Panoramix\", \"Piwi\", \"KIF17\", \"FMRP\", \"LC8/Cut-up\", \"Staufen1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}