{"gene":"SON","run_date":"2026-06-10T07:46:38","timeline":{"discoveries":[{"year":2020,"finding":"SON and SRRM2 together form the organizational core of nuclear speckles. Depletion of SON alone causes partial disassembly, but co-depletion of SON and SRRM2, or depletion of SON in cells lacking SRRM2's intrinsically disordered regions, leads to near-complete dissolution of nuclear speckles.","method":"RNAi knockdown, genetic deletion of SRRM2 IDRs, high-resolution fluorescence microscopy","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic perturbations with multiple orthogonal conditions, rigorous imaging readout, single lab but multiple complementary approaches","pmids":["33095160"],"is_preprint":false},{"year":2011,"finding":"SON is a splicing cofactor that facilitates efficient co-transcriptional splicing of cell-cycle-related pre-mRNAs with weak splice sites. SON depletion leads to impaired spindle pole separation, defective microtubule dynamics, and genome instability due to mis-splicing of a specific set of cell-cycle genes. SON also facilitates interaction of SR proteins with RNA Pol II and spliceosome components.","method":"RNAi knockdown, RNA splicing assays, co-immunoprecipitation, live-cell imaging of mitosis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RNAi, Co-IP, splicing assays, imaging), well-controlled mechanistic dissection in single focused study","pmids":["21504830"],"is_preprint":false},{"year":2010,"finding":"SON localizes precisely to nuclear speckles and is required for proper subnuclear organization of SR proteins and snRNPs. RNAi-mediated depletion of SON causes dramatic disorganization of splicing factors and cell cycle arrest in metaphase.","method":"RNAi knockdown, high-resolution fluorescence microscopy, immunofluorescence","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization with functional consequence, RNAi with defined cellular phenotype, replicated in subsequent studies","pmids":["20053686"],"is_preprint":false},{"year":2013,"finding":"SON regulates proper splicing of transcripts encoding pluripotency regulators OCT4, PRDM14, E4F1, and MED24 in human embryonic stem cells. SON is bound to these transcripts in vivo, and its depletion causes loss of pluripotency and cell death.","method":"RNAi knockdown, RNA immunoprecipitation (RIP), genome-wide RNA profiling, RT-PCR splicing assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo RNA binding confirmed by RIP, genome-wide profiling plus targeted splicing validation, multiple orthogonal methods","pmids":["24013217"],"is_preprint":false},{"year":2016,"finding":"De novo heterozygous loss-of-function mutations in SON cause accumulation of mis-spliced transcripts from genes critical for neuronal migration (TUBG1, FLNA, PNKP, WDR62, PSMD3, HDAC6) and metabolism (PCK2, PFKL, IDH2, ACY1, ADA), establishing SON as a master regulator of RNA splicing required for neurodevelopment.","method":"RNA analysis from patient-derived cells, zebrafish son knockdown, exome sequencing","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient RNA splicing analysis combined with zebrafish loss-of-function model, replicated across multiple patients and independent paper","pmids":["27545680"],"is_preprint":false},{"year":2016,"finding":"SON binds DNA near transcription start sites and interacts with menin to inhibit MLL complex assembly, resulting in decreased H3K4me3 and transcriptional repression. Alternatively spliced short isoforms of SON, upregulated in AML, lack the menin-binding domain and compete with full-length SON for chromatin occupancy, antagonizing SON-mediated transcriptional repression without impairing splicing function.","method":"ChIP-seq, Co-IP, chromatin fractionation, overexpression of isoforms, hematopoietic replating assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (ChIP-seq, Co-IP, domain mapping, functional cellular assays) in a single rigorous study","pmids":["26990989"],"is_preprint":false},{"year":2011,"finding":"SON is a component of the spliceosome and is required for mitotic progression. SON inactivation triggers MAD2-dependent mitotic delay, defective chromosome congression, compromised chromosome segregation and cytokinesis, leading to aneuploidy and cell death.","method":"RNAi knockdown, flow cytometry, live-cell imaging, MAD2 epistasis","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with defined mitotic phenotypes and genetic epistasis (MAD2), single lab with multiple readouts","pmids":["20581448"],"is_preprint":false},{"year":2011,"finding":"SON depletion causes exon skipping in a specific set of pre-mRNAs including chromatin-modifying enzymes (ADA, HDAC6, SetD8). SON localizes to a reporter minigene transcription site and RNAi depletion causes exon skipping on reporter transcripts at this site. Genome-wide exon microarray identified SON-regulated splicing targets across multiple cellular pathways.","method":"RNAi knockdown, in situ hybridization to transcription site, exon microarray, RT-PCR","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct transcription site localization with functional consequence, genome-wide analysis plus targeted validation, single lab","pmids":["22193954"],"is_preprint":false},{"year":2001,"finding":"SON/NREBP (also called DBP-5, SONB, SONA) encodes a nuclear protein that binds a specific consensus sequence GA(G/T)AN(C/G)(A/G)CC in the negative regulatory element (NRE) of the HBV core promoter. Overexpression of NREBP/SON enhances NRE-mediated repression of the HBV core promoter and represses transcription of HBV genes and virion production.","method":"Expression cloning, gel shift assay with antibody supershift, PCR-assisted binding site selection, transient transfection reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gel shift with antibody supershift plus functional reporter assays, single lab with two orthogonal methods","pmids":["11306577"],"is_preprint":false},{"year":2008,"finding":"SON interacts with the NHR4 domain of AML1-ETO via a zinc-chelating structural interface. SON knockdown by siRNA causes significant growth arrest, and disruption of AML1-ETO–SON interaction rescues cells from AML1-ETO-induced growth arrest, indicating SON is required for cell growth. In t(8;21) AML cells, SON is abnormally localized to the cytoplasm.","method":"Co-immunoprecipitation, siRNA knockdown, growth assays, immunofluorescence localization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, RNAi rescue experiment, and localization data, single lab","pmids":["18952841"],"is_preprint":false},{"year":2013,"finding":"SON regulates GATA-2 protein levels in hematopoietic cells by suppressing the promoter of the miR-23a~27a~24-2 cluster. SON knockdown leads to upregulation of miR-27a, which targets the 3'-UTR of GATA-2 mRNA, causing depletion of GATA-2 protein.","method":"RNAi knockdown, miRNA quantification, 3'-UTR reporter assays, promoter activity assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — RNAi with reporter validation, multiple readouts but indirect mechanism (no direct SON-promoter binding shown), single lab","pmids":["23322776"],"is_preprint":false},{"year":2021,"finding":"SON acts as a master splicing regulator in glioblastoma by maintaining proper splicing of PTBP1 transcripts (SON knockdown causes intron retention and PTBP1 downregulation) and by forming a complex with hnRNP A2B1 to antagonize RBFOX2-mediated neuronal splicing. SON knockdown suppresses GBM cell proliferation and tumor growth in orthotopic xenografts.","method":"RNAi knockdown, RNA-seq splicing analysis, Co-IP, in vivo xenograft models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP for complex formation, RNA-seq for splicing mechanism, in vivo validation, multiple orthogonal methods","pmids":["34548489"],"is_preprint":false},{"year":2021,"finding":"SON is required for proper splicing and expression of CEP131 (a centriolar satellite protein), and through this mechanism controls the microtubule trafficking network around centrosomes required for procentriole assembly and ciliogenesis.","method":"RNAi knockdown, whole-genome mRNA sequencing, RT-PCR splicing validation, electron microscopy of centrosome ultrastructure","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with genome-wide sequencing and targeted validation, single lab with multiple methods","pmids":["34406792"],"is_preprint":false},{"year":2016,"finding":"CK1α (casein kinase 1α) is recruited to nuclear speckles by FAM83H, which uses SON as a scaffold protein. Knockdown of FAM83H or SON delocalizes CK1α, CK1δ, and CK1ε from nuclear speckles.","method":"Interactome analysis (Co-IP/MS), RNAi knockdown, immunofluorescence","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP/MS identification plus RNAi functional validation, single lab","pmids":["27681590"],"is_preprint":false},{"year":2023,"finding":"SON protein is an essential target of m6A RNA methylation in hematopoietic stem cells. m6A methylation of Son mRNA increases during HSC commitment; upon m6A depletion, Son mRNA increases but SON protein is depleted. SON reintroduction rescues defects in HSC symmetric commitment and engraftment. Mechanistically, SON suppresses the METTL3-HSC inflammatory gene expression program including CCL5 and rescues MYC through transcriptional regulation.","method":"m6A global profiling, SON rescue experiments, Son conditional knockout, overexpression, engraftment assays, transcriptional analysis","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — m6A profiling, KO and rescue experiments, in vivo engraftment, multiple orthogonal methods in single rigorous study","pmids":["38065069"],"is_preprint":false},{"year":2020,"finding":"SON is required for macrophage autophagy, type I interferon response (IRF3 expression), and inflammasome-associated readouts. SON controls accurate splicing and expression of GBF1, a mediator of cis-Golgi structure; chemical GBF1 inhibition phenocopies SON knockdown, suggesting SON controls macrophage functions at least partly through Golgi-associated processes.","method":"RNAi knockdown, RT-PCR splicing assays, chemical inhibition, autophagy and inflammasome functional assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — RNAi with chemical phenocopy, multiple functional readouts but indirect mechanistic link, single lab","pmids":["32484234"],"is_preprint":false},{"year":2012,"finding":"SON knockdown suppresses pancreatic cancer cell proliferation, survival, and tumorigenicity in xenograft models. SON depletion induces G2/M arrest and apoptosis. Live-cell imaging showed SON forms nuclear speckles during interphase, disperses diffusely in early mitosis, accumulates in cytoplasmic foci in late mitosis, and reassembles into speckles after mitosis.","method":"RNAi knockdown screening, flow cytometry, xenograft assays, live-cell imaging","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell imaging for subcellular dynamics, in vivo xenograft for functional consequence, single lab","pmids":["23227827"],"is_preprint":false},{"year":2019,"finding":"SON haploinsufficiency leads to abnormal pre-mRNA splicing of established CAKUT genes in kidney cell lines and patient-derived cells, resulting in decreased expression of these genes and causing renal developmental phenotypes.","method":"RT-PCR splicing assays in cell lines and patient-derived cells, RNAi knockdown","journal":"Kidney international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived cells plus cell line knockdown with splicing validation, single lab","pmids":["31005274"],"is_preprint":false},{"year":2020,"finding":"Son knockdown in neural progenitors in mice causes defective neuronal migration during corticogenesis and reduced dendritic spine density. Rescue with wild-type human SON confirmed SON insufficiency as causal. Truncated SON proteins from ZTTK disease mutations showed differential rescue capacity depending on protein length.","method":"In utero electroporation knockdown, rescue with wild-type and truncated SON constructs, immunofluorescence, spine density quantification","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown with rescue experiment and domain dissection, single lab","pmids":["32448361"],"is_preprint":false},{"year":1994,"finding":"The SON gene encodes a conserved DNA-binding protein that maps to human chromosome 21q22.1-q22.2. The protein is expressed across different cell types and has homologous sequences in vertebrates and insects.","method":"cDNA cloning, somatic cell hybrid panel PCR, Southern blotting","journal":"Annals of human genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct chromosomal mapping and expression characterization, replicated by subsequent studies","pmids":["8031013"],"is_preprint":false}],"current_model":"SON is a large Ser/Arg-rich nuclear speckle protein that acts as a splicing cofactor, facilitating efficient co-transcriptional removal of introns—particularly from pre-mRNAs with weak splice sites—by promoting interaction of SR proteins with RNA Pol II and spliceosome components; together with SRRM2 it forms the structural core of nuclear speckles, regulates cell-cycle progression and genomic integrity through splicing of mitotic regulators, controls pluripotency and hematopoietic stem cell fate by accurate splicing of developmental transcription factors, suppresses MLL complex-mediated H3K4me3 transcription by binding near TSS and interacting with menin, and is itself regulated post-transcriptionally by m6A methylation of its mRNA."},"narrative":{"mechanistic_narrative":"SON is a large Ser/Arg-rich nuclear speckle protein that functions as a splicing cofactor, promoting efficient co-transcriptional splicing of pre-mRNAs that carry weak splice sites by facilitating the engagement of SR proteins with RNA Pol II and spliceosome components [PMID:21504830, PMID:22193954]. Together with SRRM2 it constitutes the structural core of nuclear speckles, and combined loss of both proteins drives near-complete dissolution of these subnuclear bodies and disorganization of SR proteins and snRNPs [PMID:33095160, PMID:20053686]. Through accurate splicing of defined target sets, SON enforces orderly mitotic progression—its depletion mis-splices cell-cycle regulators, causing spindle and chromosome segregation defects, MAD2-dependent mitotic delay, aneuploidy, and centriole/ciliogenesis defects via control of CEP131 splicing [PMID:21504830, PMID:20581448, PMID:34406792]. The same splicing-cofactor activity supports developmental and stem-cell programs: SON binds and correctly splices transcripts encoding pluripotency factors (OCT4, PRDM14, E4F1, MED24) in human embryonic stem cells, and governs hematopoietic stem cell commitment where its protein output is tuned by m6A methylation of SON mRNA, suppressing a METTL3-driven inflammatory program and sustaining MYC [PMID:24013217, PMID:38065069]. Beyond splicing, SON binds DNA near transcription start sites and interacts with menin to inhibit MLL-complex assembly and H3K4me3-dependent transcription, an activity antagonized by short SON isoforms upregulated in AML that retain chromatin occupancy but lack the menin-binding domain [PMID:26990989]. De novo heterozygous loss-of-function mutations in SON cause a neurodevelopmental disorder driven by mis-splicing of genes required for neuronal migration and metabolism [PMID:27545680].","teleology":[{"year":1994,"claim":"Established the existence and genomic identity of SON, framing it as a conserved DNA-binding nuclear protein before any functional mechanism was known.","evidence":"cDNA cloning, somatic cell hybrid PCR mapping, and Southern blotting","pmids":["8031013"],"confidence":"Medium","gaps":["No molecular activity or pathway defined","DNA-binding specificity not resolved"]},{"year":2001,"claim":"First sequence-specific function: SON was shown to bind a defined consensus in the HBV core promoter negative regulatory element and repress viral transcription, indicating a transcriptional repressor activity.","evidence":"Expression cloning, gel shift with antibody supershift, binding-site selection, and reporter assays","pmids":["11306577"],"confidence":"Medium","gaps":["Repression mechanism on endogenous host genes not addressed","Link to splicing role not yet established"]},{"year":2008,"claim":"Connected SON to leukemic transformation, showing it physically associates with AML1-ETO and is required for cell growth, with abnormal cytoplasmic relocalization in t(8;21) AML.","evidence":"Co-IP, siRNA knockdown with rescue, and immunofluorescence localization","pmids":["18952841"],"confidence":"Medium","gaps":["Molecular basis of growth requirement not defined","Single lab, no reciprocal interaction validation"]},{"year":2010,"claim":"Localized SON precisely to nuclear speckles and demonstrated it is required for the subnuclear organization of splicing factors, with mitotic arrest upon depletion, placing SON within the splicing machinery.","evidence":"RNAi knockdown with high-resolution and immunofluorescence imaging","pmids":["20053686"],"confidence":"High","gaps":["Did not define the molecular splicing activity","Targets of mis-regulation unknown at this stage"]},{"year":2011,"claim":"Defined SON's core mechanism as a splicing cofactor that promotes efficient co-transcriptional splicing of weak-splice-site pre-mRNAs—including cell-cycle genes—by linking SR proteins to Pol II and the spliceosome, explaining its mitotic phenotypes.","evidence":"RNAi, splicing assays, Co-IP, live-cell mitosis imaging, and MAD2 epistasis","pmids":["21504830","20581448"],"confidence":"High","gaps":["Direct biochemical contacts with SR proteins/Pol II not structurally resolved","Rules governing weak-site target selection unclear"]},{"year":2011,"claim":"Showed SON acts at active transcription sites to prevent exon skipping in a defined target set spanning chromatin-modifying enzymes, generalizing its splicing role genome-wide.","evidence":"RNAi, in situ hybridization to minigene transcription site, exon microarray, RT-PCR","pmids":["22193954"],"confidence":"Medium","gaps":["Determinants of target specificity not defined","Direct RNA contact sites not mapped"]},{"year":2013,"claim":"Extended the splicing function to cell-fate control, showing SON binds and properly splices pluripotency-regulator transcripts and that its loss collapses pluripotency, and separately couples SON to GATA-2 via a miRNA cluster.","evidence":"RIP, genome-wide RNA profiling, RT-PCR splicing assays, miRNA quantification, 3'-UTR reporters","pmids":["24013217","23322776"],"confidence":"High","gaps":["miR-23a~27a cluster regulation by SON shown indirectly (no direct promoter binding)","How SON discriminates pluripotency transcripts unknown"]},{"year":2016,"claim":"Revealed a chromatin-based, splicing-independent function: SON binds near TSSs and engages menin to inhibit MLL/H3K4me3 transcription, with AML-associated short isoforms acting as dominant antagonists.","evidence":"ChIP-seq, Co-IP, chromatin fractionation, isoform overexpression, hematopoietic replating","pmids":["26990989"],"confidence":"High","gaps":["Structural basis of SON-menin interaction not resolved","Genome-wide overlap of repressive vs splicing targets unclear"]},{"year":2016,"claim":"Defined SON as a human disease gene: de novo loss-of-function mutations cause a neurodevelopmental disorder through accumulation of mis-spliced neuronal-migration and metabolic transcripts.","evidence":"Patient-derived cell RNA splicing analysis, zebrafish son knockdown, exome sequencing","pmids":["27545680"],"confidence":"High","gaps":["Quantitative threshold of haploinsufficiency not defined","Which mis-spliced targets are causal for each phenotype unresolved"]},{"year":2016,"claim":"Identified a scaffolding role at speckles, with SON anchoring FAM83H-recruited casein kinase 1 isoforms, broadening SON's contribution to speckle organization beyond splicing.","evidence":"Co-IP/MS interactome, RNAi knockdown, immunofluorescence","pmids":["27681590"],"confidence":"Medium","gaps":["Functional consequence of CK1 speckle localization not established","Single lab"]},{"year":2020,"claim":"Resolved the architecture of nuclear speckles, establishing SON and SRRM2 as the co-essential structural core whose combined loss dissolves speckles.","evidence":"RNAi, genetic deletion of SRRM2 IDRs, high-resolution fluorescence microscopy","pmids":["33095160"],"confidence":"High","gaps":["Biophysical basis of SON's contribution to speckle assembly not defined","Relative roles of SON's domains in scaffolding unclear"]},{"year":2020,"claim":"Linked SON to neuronal migration in vivo and to innate immune/autophagy programs, extending its splicing function to corticogenesis and macrophage biology (via GBF1 splicing).","evidence":"In utero electroporation knockdown with WT/truncated rescue; RNAi, RT-PCR, chemical GBF1 inhibition, autophagy/inflammasome assays","pmids":["32448361","32484234"],"confidence":"Medium","gaps":["GBF1 link is an indirect phenocopy, not direct","Isoform-specific rescue thresholds incompletely defined"]},{"year":2021,"claim":"Showed SON drives splicing networks in cancer and centrosome/cilium biology—maintaining PTBP1 and CEP131 splicing and partnering with hnRNP A2B1 to antagonize RBFOX2-mediated splicing.","evidence":"RNAi, RNA-seq splicing analysis, Co-IP, EM of centrosomes, orthotopic xenografts","pmids":["34548489","34406792"],"confidence":"High","gaps":["Direct vs indirect splicing targets not fully separated","Mechanism of hnRNP A2B1 antagonism of RBFOX2 not resolved"]},{"year":2023,"claim":"Established post-transcriptional control of SON itself: m6A methylation of SON mRNA tunes SON protein levels during HSC commitment, with SON suppressing a METTL3-driven inflammatory program and rescuing MYC.","evidence":"m6A profiling, conditional Son KO, rescue/overexpression, engraftment assays, transcriptional analysis","pmids":["38065069"],"confidence":"High","gaps":["Reader/writer machinery acting on SON mRNA not fully defined","Direct vs indirect control of CCL5/MYC not separated"]},{"year":null,"claim":"How SON's distinct activities—weak-splice-site splicing cofactor, speckle scaffold, and menin-dependent chromatin repressor—are coordinated, and what structural features dictate target selection, remains unresolved.","evidence":"No single study integrates SON's splicing, scaffolding, and chromatin functions mechanistically","pmids":[],"confidence":"Low","gaps":["No structural model of SON's RNA/DNA/protein-binding domains","Rules for weak-splice-site target recognition undefined","Crosstalk between speckle scaffolding and transcriptional repression unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1,3,11]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[5,8,19]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[5,8]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[0,2,16]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,19]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1,3,7]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,6]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,8]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,4,18]}],"complexes":["nuclear speckle (SON-SRRM2 core)","spliceosome"],"partners":["SRRM2","MENIN","HNRNP A2B1","AML1-ETO","FAM83H"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P18583","full_name":"Protein SON","aliases":["Bax antagonist selected in saccharomyces 1","BASS1","Negative regulatory element-binding protein","NRE-binding protein","Protein DBP-5","SON3"],"length_aa":2426,"mass_kda":263.8,"function":"RNA-binding protein that acts as a mRNA splicing cofactor by promoting efficient splicing of transcripts that possess weak splice sites. Specifically promotes splicing of many cell-cycle and DNA-repair transcripts that possess weak splice sites, such as TUBG1, KATNB1, TUBGCP2, AURKB, PCNT, AKT1, RAD23A, and FANCG. Probably acts by facilitating the interaction between Serine/arginine-rich proteins such as SRSF2 and the RNA polymerase II. Also binds to DNA; binds to the consensus DNA sequence: 5'-GA[GT]AN[CG][AG]CC-3'. May indirectly repress hepatitis B virus (HBV) core promoter activity and transcription of HBV genes and production of HBV virions. Essential for correct RNA splicing of multiple genes critical for brain development, neuronal migration and metabolism, including TUBG1, FLNA, PNKP, WDR62, PSMD3, PCK2, PFKL, IDH2, and ACY1 (PubMed:27545680)","subcellular_location":"Nucleus speckle","url":"https://www.uniprot.org/uniprotkb/P18583/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/SON","classification":"Common Essential","n_dependent_lines":1159,"n_total_lines":1208,"dependency_fraction":0.9594370860927153},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CPSF6","stoichiometry":0.2},{"gene":"DDX21","stoichiometry":0.2},{"gene":"PSPC1","stoichiometry":0.2},{"gene":"RBM39","stoichiometry":0.2},{"gene":"RPS16","stoichiometry":0.2},{"gene":"SEC61B","stoichiometry":0.2},{"gene":"SF3A1","stoichiometry":0.2},{"gene":"SF3B1","stoichiometry":0.2},{"gene":"SNRPA","stoichiometry":0.2},{"gene":"SNRPB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SON","total_profiled":1310},"omim":[{"mim_id":"621565","title":"YU-KURY NEURODEVELOPMENTAL SYNDROME; YKNS","url":"https://www.omim.org/entry/621565"},{"mim_id":"621535","title":"SPINOCEREBELLAR ATAXIA 52; SCA52","url":"https://www.omim.org/entry/621535"},{"mim_id":"621494","title":"RNA, U6 SMALL NUCLEAR 9; RNU6-9","url":"https://www.omim.org/entry/621494"},{"mim_id":"621449","title":"OSTEOPETROSIS, AUTOSOMAL DOMINANT 4; OPTA4","url":"https://www.omim.org/entry/621449"},{"mim_id":"621421","title":"RAMOND-ELLIOTT NEURODEVELOPMENTAL SYNDROME; RAMELN","url":"https://www.omim.org/entry/621421"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nuclear speckles","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SON"},"hgnc":{"alias_symbol":["DBP-5","NREBP","KIAA1019","BASS1","FLJ21099","FLJ33914"],"prev_symbol":["C21orf50"]},"alphafold":{"accession":"P18583","domains":[{"cath_id":"-","chopping":"2269-2333","consensus_level":"medium","plddt":66.0455,"start":2269,"end":2333},{"cath_id":"3.30.160","chopping":"2363-2426","consensus_level":"medium","plddt":70.8948,"start":2363,"end":2426},{"cath_id":"1.20.5","chopping":"2221-2266","consensus_level":"medium","plddt":88.9674,"start":2221,"end":2266}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P18583","model_url":"https://alphafold.ebi.ac.uk/files/AF-P18583-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P18583-F1-predicted_aligned_error_v6.png","plddt_mean":36.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SON","jax_strain_url":"https://www.jax.org/strain/search?query=SON"},"sequence":{"accession":"P18583","fasta_url":"https://rest.uniprot.org/uniprotkb/P18583.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P18583/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P18583"}},"corpus_meta":[{"pmid":"8391166","id":"PMC_8391166","title":"Binding of the Ras activator son of sevenless to insulin receptor substrate-1 signaling complexes.","date":"1993","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/8391166","citation_count":283,"is_preprint":false},{"pmid":"10762544","id":"PMC_10762544","title":"Characteristics and frequency of germline mutations at microsatellite loci from the human Y chromosome, as revealed by direct observation in father/son pairs.","date":"2000","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10762544","citation_count":268,"is_preprint":false},{"pmid":"36175539","id":"PMC_36175539","title":"Cell death and inflammation during obesity: \"Know my methods, WAT(son)\".","date":"2022","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/36175539","citation_count":225,"is_preprint":false},{"pmid":"33095160","id":"PMC_33095160","title":"SON and SRRM2 are essential for nuclear speckle 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Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/36007266","citation_count":12,"is_preprint":false},{"pmid":"9258117","id":"PMC_9258117","title":"The significance of Ras guanine nucleotide exchange factor, son of sevenless protein, in renal cell carcinoma cell lines.","date":"1997","source":"The Journal of urology","url":"https://pubmed.ncbi.nlm.nih.gov/9258117","citation_count":12,"is_preprint":false},{"pmid":"32484234","id":"PMC_32484234","title":"SON DNA-binding protein mediates macrophage autophagy and responses to intracellular infection.","date":"2020","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/32484234","citation_count":11,"is_preprint":false},{"pmid":"37621447","id":"PMC_37621447","title":"Sequence-based mutation patterns at 41 Y chromosomal STRs in 2 548 father-son pairs.","date":"2023","source":"Forensic sciences research","url":"https://pubmed.ncbi.nlm.nih.gov/37621447","citation_count":11,"is_preprint":false},{"pmid":"23623014","id":"PMC_23623014","title":"Mutation rate at 17 Y-STR loci in \"Father/Son\" pairs from moroccan population.","date":"2013","source":"Legal medicine (Tokyo, Japan)","url":"https://pubmed.ncbi.nlm.nih.gov/23623014","citation_count":11,"is_preprint":false},{"pmid":"15798952","id":"PMC_15798952","title":"Associations of middle-aged mother's but not father's body mass index with 18-year-old son's waist circumferences, birth weight, and serum hepatic enzyme levels.","date":"2005","source":"Metabolism: clinical and experimental","url":"https://pubmed.ncbi.nlm.nih.gov/15798952","citation_count":11,"is_preprint":false},{"pmid":"38250068","id":"PMC_38250068","title":"SON-1210 - a novel bifunctional IL-12 / IL-15 fusion protein that improves cytokine half-life, targets tumors, and enhances therapeutic efficacy.","date":"2023","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/38250068","citation_count":10,"is_preprint":false},{"pmid":"23443263","id":"PMC_23443263","title":"A novel mutation in a mother and a son with Aarskog-Scott syndrome.","date":"2013","source":"Journal of pediatric endocrinology & metabolism : JPEM","url":"https://pubmed.ncbi.nlm.nih.gov/23443263","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":44986,"output_tokens":4599,"usd":0.101972,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12716,"output_tokens":4474,"usd":0.087715,"stage2_stop_reason":"end_turn"},"total_usd":0.189687,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2020,\n      \"finding\": \"SON and SRRM2 together form the organizational core of nuclear speckles. Depletion of SON alone causes partial disassembly, but co-depletion of SON and SRRM2, or depletion of SON in cells lacking SRRM2's intrinsically disordered regions, leads to near-complete dissolution of nuclear speckles.\",\n      \"method\": \"RNAi knockdown, genetic deletion of SRRM2 IDRs, high-resolution fluorescence microscopy\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic perturbations with multiple orthogonal conditions, rigorous imaging readout, single lab but multiple complementary approaches\",\n      \"pmids\": [\"33095160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SON is a splicing cofactor that facilitates efficient co-transcriptional splicing of cell-cycle-related pre-mRNAs with weak splice sites. SON depletion leads to impaired spindle pole separation, defective microtubule dynamics, and genome instability due to mis-splicing of a specific set of cell-cycle genes. SON also facilitates interaction of SR proteins with RNA Pol II and spliceosome components.\",\n      \"method\": \"RNAi knockdown, RNA splicing assays, co-immunoprecipitation, live-cell imaging of mitosis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RNAi, Co-IP, splicing assays, imaging), well-controlled mechanistic dissection in single focused study\",\n      \"pmids\": [\"21504830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SON localizes precisely to nuclear speckles and is required for proper subnuclear organization of SR proteins and snRNPs. RNAi-mediated depletion of SON causes dramatic disorganization of splicing factors and cell cycle arrest in metaphase.\",\n      \"method\": \"RNAi knockdown, high-resolution fluorescence microscopy, immunofluorescence\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization with functional consequence, RNAi with defined cellular phenotype, replicated in subsequent studies\",\n      \"pmids\": [\"20053686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SON regulates proper splicing of transcripts encoding pluripotency regulators OCT4, PRDM14, E4F1, and MED24 in human embryonic stem cells. SON is bound to these transcripts in vivo, and its depletion causes loss of pluripotency and cell death.\",\n      \"method\": \"RNAi knockdown, RNA immunoprecipitation (RIP), genome-wide RNA profiling, RT-PCR splicing assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo RNA binding confirmed by RIP, genome-wide profiling plus targeted splicing validation, multiple orthogonal methods\",\n      \"pmids\": [\"24013217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"De novo heterozygous loss-of-function mutations in SON cause accumulation of mis-spliced transcripts from genes critical for neuronal migration (TUBG1, FLNA, PNKP, WDR62, PSMD3, HDAC6) and metabolism (PCK2, PFKL, IDH2, ACY1, ADA), establishing SON as a master regulator of RNA splicing required for neurodevelopment.\",\n      \"method\": \"RNA analysis from patient-derived cells, zebrafish son knockdown, exome sequencing\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient RNA splicing analysis combined with zebrafish loss-of-function model, replicated across multiple patients and independent paper\",\n      \"pmids\": [\"27545680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SON binds DNA near transcription start sites and interacts with menin to inhibit MLL complex assembly, resulting in decreased H3K4me3 and transcriptional repression. Alternatively spliced short isoforms of SON, upregulated in AML, lack the menin-binding domain and compete with full-length SON for chromatin occupancy, antagonizing SON-mediated transcriptional repression without impairing splicing function.\",\n      \"method\": \"ChIP-seq, Co-IP, chromatin fractionation, overexpression of isoforms, hematopoietic replating assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (ChIP-seq, Co-IP, domain mapping, functional cellular assays) in a single rigorous study\",\n      \"pmids\": [\"26990989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SON is a component of the spliceosome and is required for mitotic progression. SON inactivation triggers MAD2-dependent mitotic delay, defective chromosome congression, compromised chromosome segregation and cytokinesis, leading to aneuploidy and cell death.\",\n      \"method\": \"RNAi knockdown, flow cytometry, live-cell imaging, MAD2 epistasis\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with defined mitotic phenotypes and genetic epistasis (MAD2), single lab with multiple readouts\",\n      \"pmids\": [\"20581448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SON depletion causes exon skipping in a specific set of pre-mRNAs including chromatin-modifying enzymes (ADA, HDAC6, SetD8). SON localizes to a reporter minigene transcription site and RNAi depletion causes exon skipping on reporter transcripts at this site. Genome-wide exon microarray identified SON-regulated splicing targets across multiple cellular pathways.\",\n      \"method\": \"RNAi knockdown, in situ hybridization to transcription site, exon microarray, RT-PCR\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct transcription site localization with functional consequence, genome-wide analysis plus targeted validation, single lab\",\n      \"pmids\": [\"22193954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SON/NREBP (also called DBP-5, SONB, SONA) encodes a nuclear protein that binds a specific consensus sequence GA(G/T)AN(C/G)(A/G)CC in the negative regulatory element (NRE) of the HBV core promoter. Overexpression of NREBP/SON enhances NRE-mediated repression of the HBV core promoter and represses transcription of HBV genes and virion production.\",\n      \"method\": \"Expression cloning, gel shift assay with antibody supershift, PCR-assisted binding site selection, transient transfection reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gel shift with antibody supershift plus functional reporter assays, single lab with two orthogonal methods\",\n      \"pmids\": [\"11306577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SON interacts with the NHR4 domain of AML1-ETO via a zinc-chelating structural interface. SON knockdown by siRNA causes significant growth arrest, and disruption of AML1-ETO–SON interaction rescues cells from AML1-ETO-induced growth arrest, indicating SON is required for cell growth. In t(8;21) AML cells, SON is abnormally localized to the cytoplasm.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, growth assays, immunofluorescence localization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, RNAi rescue experiment, and localization data, single lab\",\n      \"pmids\": [\"18952841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SON regulates GATA-2 protein levels in hematopoietic cells by suppressing the promoter of the miR-23a~27a~24-2 cluster. SON knockdown leads to upregulation of miR-27a, which targets the 3'-UTR of GATA-2 mRNA, causing depletion of GATA-2 protein.\",\n      \"method\": \"RNAi knockdown, miRNA quantification, 3'-UTR reporter assays, promoter activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — RNAi with reporter validation, multiple readouts but indirect mechanism (no direct SON-promoter binding shown), single lab\",\n      \"pmids\": [\"23322776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SON acts as a master splicing regulator in glioblastoma by maintaining proper splicing of PTBP1 transcripts (SON knockdown causes intron retention and PTBP1 downregulation) and by forming a complex with hnRNP A2B1 to antagonize RBFOX2-mediated neuronal splicing. SON knockdown suppresses GBM cell proliferation and tumor growth in orthotopic xenografts.\",\n      \"method\": \"RNAi knockdown, RNA-seq splicing analysis, Co-IP, in vivo xenograft models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP for complex formation, RNA-seq for splicing mechanism, in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"34548489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SON is required for proper splicing and expression of CEP131 (a centriolar satellite protein), and through this mechanism controls the microtubule trafficking network around centrosomes required for procentriole assembly and ciliogenesis.\",\n      \"method\": \"RNAi knockdown, whole-genome mRNA sequencing, RT-PCR splicing validation, electron microscopy of centrosome ultrastructure\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with genome-wide sequencing and targeted validation, single lab with multiple methods\",\n      \"pmids\": [\"34406792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CK1α (casein kinase 1α) is recruited to nuclear speckles by FAM83H, which uses SON as a scaffold protein. Knockdown of FAM83H or SON delocalizes CK1α, CK1δ, and CK1ε from nuclear speckles.\",\n      \"method\": \"Interactome analysis (Co-IP/MS), RNAi knockdown, immunofluorescence\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP/MS identification plus RNAi functional validation, single lab\",\n      \"pmids\": [\"27681590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SON protein is an essential target of m6A RNA methylation in hematopoietic stem cells. m6A methylation of Son mRNA increases during HSC commitment; upon m6A depletion, Son mRNA increases but SON protein is depleted. SON reintroduction rescues defects in HSC symmetric commitment and engraftment. Mechanistically, SON suppresses the METTL3-HSC inflammatory gene expression program including CCL5 and rescues MYC through transcriptional regulation.\",\n      \"method\": \"m6A global profiling, SON rescue experiments, Son conditional knockout, overexpression, engraftment assays, transcriptional analysis\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — m6A profiling, KO and rescue experiments, in vivo engraftment, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"38065069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SON is required for macrophage autophagy, type I interferon response (IRF3 expression), and inflammasome-associated readouts. SON controls accurate splicing and expression of GBF1, a mediator of cis-Golgi structure; chemical GBF1 inhibition phenocopies SON knockdown, suggesting SON controls macrophage functions at least partly through Golgi-associated processes.\",\n      \"method\": \"RNAi knockdown, RT-PCR splicing assays, chemical inhibition, autophagy and inflammasome functional assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — RNAi with chemical phenocopy, multiple functional readouts but indirect mechanistic link, single lab\",\n      \"pmids\": [\"32484234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SON knockdown suppresses pancreatic cancer cell proliferation, survival, and tumorigenicity in xenograft models. SON depletion induces G2/M arrest and apoptosis. Live-cell imaging showed SON forms nuclear speckles during interphase, disperses diffusely in early mitosis, accumulates in cytoplasmic foci in late mitosis, and reassembles into speckles after mitosis.\",\n      \"method\": \"RNAi knockdown screening, flow cytometry, xenograft assays, live-cell imaging\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell imaging for subcellular dynamics, in vivo xenograft for functional consequence, single lab\",\n      \"pmids\": [\"23227827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SON haploinsufficiency leads to abnormal pre-mRNA splicing of established CAKUT genes in kidney cell lines and patient-derived cells, resulting in decreased expression of these genes and causing renal developmental phenotypes.\",\n      \"method\": \"RT-PCR splicing assays in cell lines and patient-derived cells, RNAi knockdown\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived cells plus cell line knockdown with splicing validation, single lab\",\n      \"pmids\": [\"31005274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Son knockdown in neural progenitors in mice causes defective neuronal migration during corticogenesis and reduced dendritic spine density. Rescue with wild-type human SON confirmed SON insufficiency as causal. Truncated SON proteins from ZTTK disease mutations showed differential rescue capacity depending on protein length.\",\n      \"method\": \"In utero electroporation knockdown, rescue with wild-type and truncated SON constructs, immunofluorescence, spine density quantification\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown with rescue experiment and domain dissection, single lab\",\n      \"pmids\": [\"32448361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The SON gene encodes a conserved DNA-binding protein that maps to human chromosome 21q22.1-q22.2. The protein is expressed across different cell types and has homologous sequences in vertebrates and insects.\",\n      \"method\": \"cDNA cloning, somatic cell hybrid panel PCR, Southern blotting\",\n      \"journal\": \"Annals of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct chromosomal mapping and expression characterization, replicated by subsequent studies\",\n      \"pmids\": [\"8031013\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SON is a large Ser/Arg-rich nuclear speckle protein that acts as a splicing cofactor, facilitating efficient co-transcriptional removal of introns—particularly from pre-mRNAs with weak splice sites—by promoting interaction of SR proteins with RNA Pol II and spliceosome components; together with SRRM2 it forms the structural core of nuclear speckles, regulates cell-cycle progression and genomic integrity through splicing of mitotic regulators, controls pluripotency and hematopoietic stem cell fate by accurate splicing of developmental transcription factors, suppresses MLL complex-mediated H3K4me3 transcription by binding near TSS and interacting with menin, and is itself regulated post-transcriptionally by m6A methylation of its mRNA.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SON is a large Ser/Arg-rich nuclear speckle protein that functions as a splicing cofactor, promoting efficient co-transcriptional splicing of pre-mRNAs that carry weak splice sites by facilitating the engagement of SR proteins with RNA Pol II and spliceosome components [#1, #7]. Together with SRRM2 it constitutes the structural core of nuclear speckles, and combined loss of both proteins drives near-complete dissolution of these subnuclear bodies and disorganization of SR proteins and snRNPs [#0, #2]. Through accurate splicing of defined target sets, SON enforces orderly mitotic progression—its depletion mis-splices cell-cycle regulators, causing spindle and chromosome segregation defects, MAD2-dependent mitotic delay, aneuploidy, and centriole/ciliogenesis defects via control of CEP131 splicing [#1, #6, #12]. The same splicing-cofactor activity supports developmental and stem-cell programs: SON binds and correctly splices transcripts encoding pluripotency factors (OCT4, PRDM14, E4F1, MED24) in human embryonic stem cells, and governs hematopoietic stem cell commitment where its protein output is tuned by m6A methylation of SON mRNA, suppressing a METTL3-driven inflammatory program and sustaining MYC [#3, #14]. Beyond splicing, SON binds DNA near transcription start sites and interacts with menin to inhibit MLL-complex assembly and H3K4me3-dependent transcription, an activity antagonized by short SON isoforms upregulated in AML that retain chromatin occupancy but lack the menin-binding domain [#5]. De novo heterozygous loss-of-function mutations in SON cause a neurodevelopmental disorder driven by mis-splicing of genes required for neuronal migration and metabolism [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established the existence and genomic identity of SON, framing it as a conserved DNA-binding nuclear protein before any functional mechanism was known.\",\n      \"evidence\": \"cDNA cloning, somatic cell hybrid PCR mapping, and Southern blotting\",\n      \"pmids\": [\"8031013\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular activity or pathway defined\", \"DNA-binding specificity not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"First sequence-specific function: SON was shown to bind a defined consensus in the HBV core promoter negative regulatory element and repress viral transcription, indicating a transcriptional repressor activity.\",\n      \"evidence\": \"Expression cloning, gel shift with antibody supershift, binding-site selection, and reporter assays\",\n      \"pmids\": [\"11306577\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Repression mechanism on endogenous host genes not addressed\", \"Link to splicing role not yet established\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Connected SON to leukemic transformation, showing it physically associates with AML1-ETO and is required for cell growth, with abnormal cytoplasmic relocalization in t(8;21) AML.\",\n      \"evidence\": \"Co-IP, siRNA knockdown with rescue, and immunofluorescence localization\",\n      \"pmids\": [\"18952841\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of growth requirement not defined\", \"Single lab, no reciprocal interaction validation\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Localized SON precisely to nuclear speckles and demonstrated it is required for the subnuclear organization of splicing factors, with mitotic arrest upon depletion, placing SON within the splicing machinery.\",\n      \"evidence\": \"RNAi knockdown with high-resolution and immunofluorescence imaging\",\n      \"pmids\": [\"20053686\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular splicing activity\", \"Targets of mis-regulation unknown at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined SON's core mechanism as a splicing cofactor that promotes efficient co-transcriptional splicing of weak-splice-site pre-mRNAs—including cell-cycle genes—by linking SR proteins to Pol II and the spliceosome, explaining its mitotic phenotypes.\",\n      \"evidence\": \"RNAi, splicing assays, Co-IP, live-cell mitosis imaging, and MAD2 epistasis\",\n      \"pmids\": [\"21504830\", \"20581448\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical contacts with SR proteins/Pol II not structurally resolved\", \"Rules governing weak-site target selection unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed SON acts at active transcription sites to prevent exon skipping in a defined target set spanning chromatin-modifying enzymes, generalizing its splicing role genome-wide.\",\n      \"evidence\": \"RNAi, in situ hybridization to minigene transcription site, exon microarray, RT-PCR\",\n      \"pmids\": [\"22193954\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants of target specificity not defined\", \"Direct RNA contact sites not mapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended the splicing function to cell-fate control, showing SON binds and properly splices pluripotency-regulator transcripts and that its loss collapses pluripotency, and separately couples SON to GATA-2 via a miRNA cluster.\",\n      \"evidence\": \"RIP, genome-wide RNA profiling, RT-PCR splicing assays, miRNA quantification, 3'-UTR reporters\",\n      \"pmids\": [\"24013217\", \"23322776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"miR-23a~27a cluster regulation by SON shown indirectly (no direct promoter binding)\", \"How SON discriminates pluripotency transcripts unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed a chromatin-based, splicing-independent function: SON binds near TSSs and engages menin to inhibit MLL/H3K4me3 transcription, with AML-associated short isoforms acting as dominant antagonists.\",\n      \"evidence\": \"ChIP-seq, Co-IP, chromatin fractionation, isoform overexpression, hematopoietic replating\",\n      \"pmids\": [\"26990989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of SON-menin interaction not resolved\", \"Genome-wide overlap of repressive vs splicing targets unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined SON as a human disease gene: de novo loss-of-function mutations cause a neurodevelopmental disorder through accumulation of mis-spliced neuronal-migration and metabolic transcripts.\",\n      \"evidence\": \"Patient-derived cell RNA splicing analysis, zebrafish son knockdown, exome sequencing\",\n      \"pmids\": [\"27545680\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative threshold of haploinsufficiency not defined\", \"Which mis-spliced targets are causal for each phenotype unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified a scaffolding role at speckles, with SON anchoring FAM83H-recruited casein kinase 1 isoforms, broadening SON's contribution to speckle organization beyond splicing.\",\n      \"evidence\": \"Co-IP/MS interactome, RNAi knockdown, immunofluorescence\",\n      \"pmids\": [\"27681590\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of CK1 speckle localization not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved the architecture of nuclear speckles, establishing SON and SRRM2 as the co-essential structural core whose combined loss dissolves speckles.\",\n      \"evidence\": \"RNAi, genetic deletion of SRRM2 IDRs, high-resolution fluorescence microscopy\",\n      \"pmids\": [\"33095160\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biophysical basis of SON's contribution to speckle assembly not defined\", \"Relative roles of SON's domains in scaffolding unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked SON to neuronal migration in vivo and to innate immune/autophagy programs, extending its splicing function to corticogenesis and macrophage biology (via GBF1 splicing).\",\n      \"evidence\": \"In utero electroporation knockdown with WT/truncated rescue; RNAi, RT-PCR, chemical GBF1 inhibition, autophagy/inflammasome assays\",\n      \"pmids\": [\"32448361\", \"32484234\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GBF1 link is an indirect phenocopy, not direct\", \"Isoform-specific rescue thresholds incompletely defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed SON drives splicing networks in cancer and centrosome/cilium biology—maintaining PTBP1 and CEP131 splicing and partnering with hnRNP A2B1 to antagonize RBFOX2-mediated splicing.\",\n      \"evidence\": \"RNAi, RNA-seq splicing analysis, Co-IP, EM of centrosomes, orthotopic xenografts\",\n      \"pmids\": [\"34548489\", \"34406792\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect splicing targets not fully separated\", \"Mechanism of hnRNP A2B1 antagonism of RBFOX2 not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established post-transcriptional control of SON itself: m6A methylation of SON mRNA tunes SON protein levels during HSC commitment, with SON suppressing a METTL3-driven inflammatory program and rescuing MYC.\",\n      \"evidence\": \"m6A profiling, conditional Son KO, rescue/overexpression, engraftment assays, transcriptional analysis\",\n      \"pmids\": [\"38065069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reader/writer machinery acting on SON mRNA not fully defined\", \"Direct vs indirect control of CCL5/MYC not separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SON's distinct activities—weak-splice-site splicing cofactor, speckle scaffold, and menin-dependent chromatin repressor—are coordinated, and what structural features dictate target selection, remains unresolved.\",\n      \"evidence\": \"No single study integrates SON's splicing, scaffolding, and chromatin functions mechanistically\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of SON's RNA/DNA/protein-binding domains\", \"Rules for weak-splice-site target recognition undefined\", \"Crosstalk between speckle scaffolding and transcriptional repression unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1, 3, 11]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [5, 8, 19]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [5, 8]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [0, 2, 16]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 19]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 3, 7]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 8]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 4, 18]}\n    ],\n    \"complexes\": [\n      \"nuclear speckle (SON-SRRM2 core)\",\n      \"spliceosome\"\n    ],\n    \"partners\": [\n      \"SRRM2\",\n      \"menin\",\n      \"hnRNP A2B1\",\n      \"AML1-ETO\",\n      \"FAM83H\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}