{"gene":"SNRPN","run_date":"2026-06-10T07:46:37","timeline":{"discoveries":[{"year":1992,"finding":"Snrpn is maternally imprinted in mouse brain and heart, with expression exclusively from the paternal allele; the gene encodes a brain-enriched small nuclear ribonucleoprotein (snRNP)-associated polypeptide SmN involved in RNA splicing.","method":"RT-PCR allele-specific expression analysis in mouse brain; chromosomal mapping to mouse chromosome 7 (syntenic to human 15q11-13)","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated independently in two companion papers (PMID:1303276 and PMID:1303277) using allele-specific expression and chromosomal mapping; further confirmed by maternal duplication mouse model (PMID:1303278)","pmids":["1303276","1303277","1303278"],"is_preprint":false},{"year":1993,"finding":"The SNRPN gene encodes the SmN protein involved in pre-mRNA splicing; SmN is a constitutive core snRNP protein closely related to SmB/B', replacing SmB/B' specifically in brain.","method":"cDNA cloning, gene expression analysis, protein characterization","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — established by multiple independent labs, consistent with biochemical characterization of snRNP core protein function","pmids":["8111367"],"is_preprint":false},{"year":1994,"finding":"Human SNRPN is exclusively expressed from the paternal allele (maternally imprinted) in fetal brain and heart, as demonstrated by sequence polymorphism analysis confirming maternal allele silencing.","method":"RT-PCR of expressed polymorphism, analysis of maternal DNA vs cDNA in fetal brain and heart","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal allele-specific expression confirmed by multiple independent labs using PWS/AS patient cells and polymorphism analysis","pmids":["7512861","8111367"],"is_preprint":false},{"year":1994,"finding":"Small deletions removing a differentially methylated CpG island at the 5' end of SNRPN (including exon alpha) cause loss of expression for SNRPN and flanking imprinted transcripts and alter methylation over hundreds of kilobases, defining a paternal imprinting control region (IC) at this locus.","method":"Deletion mapping in PWS patients, methylation analysis, transcript expression studies","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple PWS patient deletions characterized, replicated by multiple subsequent studies defining the imprinting center","pmids":["7987392"],"is_preprint":false},{"year":1996,"finding":"The SNRPN CpG island (encompassing exon -1 and the transcription start site) is extensively methylated on the silent maternal allele and unmethylated on the expressed paternal allele across a wide range of fetal and adult somatic tissues; a downstream intronic region (intron 5) is preferentially methylated on the expressed paternal allele in somatic tissues and male germ cells but unmethylated in fetal oocytes.","method":"Methylation analysis by Southern blot with methylation-sensitive restriction enzymes; allele-specific methylation in multiple tissues","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple tissues and developmental stages analyzed, replicated in diagnostic studies by multiple independent labs","pmids":["8571960"],"is_preprint":false},{"year":1996,"finding":"In vitro methylation of the SNRPN promoter (260-bp fragment containing exon 1) completely abolishes promoter activity, demonstrating that silencing of the maternal allele is a direct consequence of CpG methylation of the promoter region.","method":"Functional promoter assay in transfected cells; in vitro methylation of promoter construct followed by reporter gene activity measurement","journal":"Genome research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro methylation + functional reporter assay, single lab but clear causal mechanism demonstrated","pmids":["9199937"],"is_preprint":false},{"year":1996,"finding":"Alternative non-coding transcripts of SNRPN (novel upstream exons without protein-coding potential) are expressed from the paternal chromosome only and intragenic deletions/point mutations in these alternative transcripts are found in AS and PWS patients with imprint switch failure, indicating these transcripts are involved in imprint switching.","method":"cDNA cloning, RT-PCR allele-specific expression, mutation analysis in AS/PWS patients","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient mutation analysis combined with expression data, single main lab but consistent with other imprinting center studies","pmids":["8841186"],"is_preprint":false},{"year":1997,"finding":"The mouse Snrpn gene has two differentially methylated regions: DMR1 (maternally methylated at 5' end, correlating inversely with paternal expression) and DMR2 (paternally methylated at 3' end). DMR1 is remethylated during oogenesis and DMR2 during spermatogenesis; both methylation patterns are erased in primordial germ cells at 12.5 dpc and re-established during gametogenesis.","method":"Bisulfite sequencing, methylation analysis of gametes and embryos, ES cell transfection and pronuclear injection experiments, methylase-deficient mouse embryo analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods including methylase-deficient embryos and transgenic experiments; replicated by subsequent structural studies","pmids":["9294199"],"is_preprint":false},{"year":1999,"finding":"Western analysis demonstrates that SmB'/B levels are dramatically upregulated in PWS brain tissue in response to loss of SmN (SNRPN product), indicating a compensatory feedback loop that maintains stoichiometric levels of spliceosomal snRNP components.","method":"Western blot analysis of PWS brain tissue; comparative protein quantification","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein quantification in disease tissue, single lab, but clear compensatory relationship demonstrated","pmids":["10556313"],"is_preprint":false},{"year":1999,"finding":"The SNRPN/Snrpn promoter and exon 1 region functions as the PWS-IC element required not only for establishment of the paternal imprint in the male germline but also for its postzygotic maintenance; deletion of this element causes acquisition of a maternal methylation imprint on the paternal chromosome in somatic cells.","method":"Analysis of mosaic PWS patient with IC deletion; generation of chimeric mice from ES cell lines with analogous deletion; methylation analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient plus mouse ES cell model with independent replication, dual function (establishment and maintenance) demonstrated","pmids":["10802660"],"is_preprint":false},{"year":2001,"finding":"DNA methylation at the Snrpn DMR1 is linked to deacetylation of histone H3 (at K9, K14, K18) but not H4 on the methylated maternal allele; the methyl-CpG-binding protein MeCP2 associates exclusively with the methylated maternal allele; experimentally induced methylation of the paternal allele leads to H3 underacetylation.","method":"Chromatin immunoprecipitation (ChIP) with allele resolution by SSCP; transgene-induced methylation experiments; F1 mouse analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP with allele-specific resolution plus transgenic experiment demonstrating causality, multiple orthogonal methods","pmids":["11463825"],"is_preprint":false},{"year":2001,"finding":"The IC-SNURF-SNRPN transcript serves as the host transcript for multiple snoRNAs (HBII-13, HBII-85, HBII-52, HBII-436, HBII-437, HBII-438A, HBII-438B) encoded within its introns, and also serves as an antisense transcript for UBE3A spanning more than 460 kb; Northern blot analysis indicates the snoRNAs are expressed by processing from these introns.","method":"cDNA cloning, Northern blot analysis, RT-PCR, genomic sequencing","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — Northern blot plus RT-PCR plus sequence analysis establishing host transcript function; widely replicated","pmids":["11726556"],"is_preprint":false},{"year":2001,"finding":"A 0.9-kb deletion of mouse Snrpn exon 1 did not disrupt imprinting, but a larger 4.8-kb overlapping deletion caused partial/mosaic imprinting defects and perinatal lethality when paternally inherited, revealing that sequences beyond exon 1 within this region are required for imprinting center function.","method":"Targeted deletion in mice; methylation and gene expression analysis; phenotypic characterization","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via targeted deletion with clear phenotypic and molecular readouts; differential effect of two deletion sizes defines functional boundaries","pmids":["11431693"],"is_preprint":false},{"year":2002,"finding":"An ATG-to-AAG point mutation in the initiation codon of the upstream ORF (SNURF) in the bicistronic Snurf-Snrpn transcript causes a 15-fold or greater increase in translation of the downstream Snrpn ORF, providing evidence that SNURF upstream ORF normally suppresses translation of SNRPN through translational control.","method":"ENU mutagenesis screen; Northern blotting; immunoblotting; transfection assays with mutant constructs","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vivo mutation plus in vitro transfection with immunoblot quantification, multiple orthogonal methods demonstrating translational regulatory mechanism","pmids":["12075010"],"is_preprint":false},{"year":2005,"finding":"The SNRPN 5' region contains two DNase I hypersensitive sites (DHS1 at the promoter and DHS2 in intron 1) exclusively on the paternal allele; in vivo footprinting and ChIP identified allele-specific interactions with NRF-1, YY1, Sp1, and unphosphorylated RNA Pol II at these sites, with DHS2 functioning as an enhancer of the SNRPN promoter.","method":"In vivo DNase I hypersensitivity mapping; in vivo footprinting; chromatin immunoprecipitation (ChIP); reporter gene assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods (in vivo footprinting, ChIP, reporter assay) in single study establishing allele-specific transcription factor binding and enhancer function","pmids":["16116039"],"is_preprint":false},{"year":2016,"finding":"SNRPN protein regulates cortical neuron development: overexpression or knockdown impairs neurite outgrowth, neuron migration, and dendritic spine distribution. SNRPN controls the expression level of the nuclear receptor Nr4a1, and the spine development defects caused by SNRPN overexpression are fully rescued by Nr4a1 co-expression; knockdown of Nr4a1 or its antagonist DIM rescues SNRPN knockdown effects on neurite outgrowth.","method":"Overexpression and knockdown in primary cortical neurons; neurite outgrowth, migration and spine morphology assays; rescue experiments with Nr4a1 co-expression and pharmacological antagonism","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function and gain-of-function with specific phenotypic readouts plus epistasis rescue experiment, single lab","pmids":["27430727"],"is_preprint":false},{"year":2019,"finding":"TET3 binds directly to the paternal transcribed allele of the imprinted Snrpn gene in adult neural stem cells (NSCs) through a non-catalytic mechanism, contributing to transcriptional repression of Snrpn; loss of this TET3-mediated repression leads to upregulation of SNRPN, which in turn promotes BMP2-mediated astrocytic terminal differentiation of NSCs.","method":"ChIP demonstrating TET3 binding to Snrpn locus; NSC-specific TET3 knockout with phenotypic readout (premature astrocyte differentiation); identification of BMP2 as SNRPN effector","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus genetic KO with cellular phenotype and effector identification, single lab, non-catalytic mechanism inferred from catalytic mutant experiments","pmids":["30979904"],"is_preprint":false},{"year":1996,"finding":"Allele-specific differential chromatin conformation at SNRPN: the paternal allele (expressed) shows prominent DNase I hypersensitive sites flanking exon 1, while the maternal allele is completely inaccessible to nucleases at this region; regions of increased nuclease hypersensitivity on the maternal allele correlate with hypermethylation on the paternal allele at several sites.","method":"In vivo DNase I and Msp I hypersensitivity analysis on lymphoblastoid cell lines from PWS and AS individuals; allele-specific chromatin structure mapping","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo chromatin analysis with allele-specific resolution using PWS/AS cells as controls, single study but rigorous approach","pmids":["10072422"],"is_preprint":false},{"year":1994,"finding":"Mice with maternal duplication for the Snrpn-containing chromosome 7 region do not express Snrpn, providing a genetic model for PWS and demonstrating that both copies must be maternally derived for silencing; the closely linked Gabrb3 locus is not subject to imprinting.","method":"Maternal duplication mouse model; RT-PCR expression analysis; genetic mapping","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via maternal duplication model with direct expression measurement, companion paper to two independent mapping studies","pmids":["1303278"],"is_preprint":false},{"year":1998,"finding":"Mouse and human SNRPN/Snrpn gene structure is conserved with ten exons spanning 22 kb; the promoter contains a differentially methylated CpG island; intron 1 contains G-rich clustered repeats conserved between mouse and human that may play a role in establishing imprint-associated DNA methylation patterns.","method":"Genomic and cDNA characterization; methylation analysis in ES cells and adult tissues; structural conservation analysis between mouse and human","journal":"Mammalian genome","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — structural characterization with functional methylation analysis, single lab","pmids":["9745031"],"is_preprint":false},{"year":1996,"finding":"Monoallelic (paternal-only) expression of SNRPN is maintained in human uterus and leiomyoma, demonstrating that the imprint is preserved in these smooth muscle tissues.","method":"RFLP analysis of SNRPN expression from genomic DNA and mRNA in 20 patients","journal":"Gynecologic and obstetric investigation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single RFLP-based expression analysis, limited mechanistic insight beyond imprint maintenance confirmation","pmids":["8821886"],"is_preprint":false},{"year":2001,"finding":"Maternal and paternal genomes function independently in establishing parental-specific expression of Snrpn in mouse ova; both paternal Snrpn alleles are active in androgenetic ova and neither is active in gynogenetic ova, with no evidence for trans-allelic/genomic counting or exclusion mechanisms.","method":"Quantitative allele-specific RT-PCR single nucleotide primer extension in gynogenetic, androgenetic, triploid, and tetraploid ova; single blastomere analysis","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative allele-specific assay in multiple experimental genotypes (gynogenotes, androgenotes, polyploids), single lab but rigorous genetic design","pmids":["8947024"],"is_preprint":false},{"year":2001,"finding":"The conserved activator sequence (CAS) in Snrpn intron 1 has methylation-sensitive enhancer activity and shows developmentally dynamic changes in DNA methylation (not a germline DMR), suggesting it controls tissue-specific expression of IC transcripts.","method":"Methylation analysis of CAS across developmental stages; reporter gene assay demonstrating methylation-sensitive enhancer activity","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — functional reporter assay plus developmental methylation analysis, single lab","pmids":["19095049"],"is_preprint":false},{"year":1999,"finding":"An 85-kb murine Snrpn transgene (containing 33 kb of 5' and 30 kb of 3' flanking DNA) with two copies recapitulated imprinted expression, while a single copy did not, suggesting a 6.6-kb region of maternal-specific DNA methylation may be sufficient to confer imprinted expression in a copy-number-dependent manner; a 76-kb human SNRPN transgene was expressed biallelically in mice regardless of copy number.","method":"Transgenic mouse lines with murine and human SNRPN constructs; methylation and allele-specific expression analysis","journal":"Mammalian genome","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic analysis with multiple lines and allele-specific expression, single lab; copy-number dependence limits mechanistic conclusion","pmids":["10341083"],"is_preprint":false},{"year":2001,"finding":"The Snrpn minimal promoter requires a 7 bp element (SBE) within the 76 bp exon 1 for activity in its unmethylated state; this element binds a specific protein and its mutation abolishes promoter function. The mouse Snrpn minimal promoter (84 bp upstream + exon 1) contains all elements necessary for activity and imprinting, while the orthologous human sequence lacks these functional elements.","method":"Transfection reporter assays; transgenic experiments with SBE mutants; chimeric mouse/human promoter constructs","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro promoter assay plus transgenic validation with mutagenesis, single lab; human/mouse divergence adds complexity","pmids":["11733034"],"is_preprint":false},{"year":1993,"finding":"C-reactive protein (CRP) binds to the Sm-D protein of snRNPs through a calcium-dependent, phosphocholine-inhibitable interaction mediated by the C-terminal region of Sm-D; deletion mapping demonstrated that the CRP binding domain resides in this C-terminal region which is also proposed to bind RNA.","method":"CRP binding assays with snRNP fractions; fusion protein pull-down; deletion mutant mapping","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — fusion protein deletion mutant mapping with specific inhibition controls (PC and EDTA), single lab","pmids":["8502240"],"is_preprint":false},{"year":1992,"finding":"Mice lacking Snrpn expression die shortly after birth, but neuronal-specific alternative splicing of several different classes of protein RNAs proceeds normally in these mice, indicating that SmN is not required for the regulation of the tested neuronal-specific alternative splicing events.","method":"RT-PCR analysis of alternative splicing events in brain of non-expressing mice (maternal duplication model)","journal":"Molecular biology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific negative result: loss-of-function with multiple alternative splicing readouts; establishes that tested splicing events are SmN-independent","pmids":["7845394"],"is_preprint":false}],"current_model":"SNRPN encodes the SmN protein, a core spliceosomal snRNP component that replaces SmB/B' in brain and is expressed exclusively from the paternal allele due to maternal imprinting enforced by CpG methylation of its promoter CpG island; the locus also serves as the host transcript for multiple snoRNAs and a long antisense transcript regulating UBE3A, and its 5' region functions as the PWS imprinting control center (IC) required for establishing and maintaining paternal epigenotypes across the 15q11-q13 domain through allele-specific chromatin organization involving NRF-1, YY1, Sp1, RNA Pol II binding, and histone H3 deacetylation linked to MeCP2 recruitment; at the cellular level, SNRPN protein regulates cortical neuron development and dendritic spine morphology through control of the nuclear receptor Nr4a1, and is subject to non-catalytic repression by TET3 in adult neural stem cells to prevent premature astrocytic differentiation via BMP2."},"narrative":{"mechanistic_narrative":"SNRPN encodes SmN, a brain-enriched core small nuclear ribonucleoprotein (snRNP) polypeptide closely related to and functionally substituting for SmB/B' in pre-mRNA splicing [PMID:8111367]. SmN is not strictly required for the neuronal-specific alternative splicing events tested, and its loss in PWS brain triggers compensatory upregulation of SmB'/B that restores stoichiometric snRNP component levels [PMID:7845394, PMID:10556313]. The defining biological feature of SNRPN is its expression exclusively from the paternal allele, with the maternal allele silenced by CpG methylation of the promoter CpG island — methylation that directly abolishes promoter activity in reporter assays [PMID:1303276, PMID:1303277, PMID:1303278, PMID:7512861, PMID:8111367, PMID:9199937]. The locus harbors the Prader-Willi syndrome imprinting control center: deletion of the differentially methylated 5' region disrupts SNRPN and flanking imprinted transcripts and perturbs methylation over hundreds of kilobases, and this element is required both for establishing the paternal imprint in the male germline and for its postzygotic maintenance [PMID:7987392, PMID:10802660, PMID:11431693]. Allele-specific silencing operates through coordinated chromatin organization: the methylated maternal allele is nuclease-inaccessible, hypoacetylated at histone H3, and bound by MeCP2, whereas the paternal allele displays DNase I hypersensitive sites bound by NRF-1, YY1, Sp1, and unphosphorylated RNA Pol II [PMID:11463825, PMID:10072422, PMID:16116039]. The IC-SNURF-SNRPN transcript additionally serves as the host for multiple intronic snoRNAs and as a >460-kb antisense transcript for UBE3A, while the upstream SNURF ORF translationally represses the downstream SNRPN ORF [PMID:11726556, PMID:12075010]. Beyond splicing, SNRPN protein regulates cortical neuron development, neurite outgrowth, migration, and dendritic spine morphology through control of the nuclear receptor Nr4a1, and is held in check in adult neural stem cells by non-catalytic TET3 binding that prevents premature BMP2-mediated astrocytic differentiation [PMID:27430727, PMID:30979904].","teleology":[{"year":1992,"claim":"Established that Snrpn is a genomically imprinted gene expressed only from the paternal allele, defining it as a candidate locus for the parent-of-origin disorders mapping to this chromosomal region.","evidence":"Allele-specific RT-PCR in mouse brain/heart plus chromosomal mapping, with a maternal-duplication mouse model confirming silencing","pmids":["1303276","1303277","1303278"],"confidence":"High","gaps":["Did not define the cis-element enforcing the imprint","Molecular identity of the silencing mark not yet established"]},{"year":1993,"claim":"Identified the SNRPN gene product as SmN, a core snRNP protein that replaces SmB/B' in brain, assigning a concrete molecular function in pre-mRNA splicing.","evidence":"cDNA cloning and protein characterization in human tissue","pmids":["8111367"],"confidence":"High","gaps":["Specific splicing substrates of SmN not defined","Functional consequence of SmN vs SmB/B' substitution in brain unresolved"]},{"year":1994,"claim":"Confirmed paternal-only expression of human SNRPN and located a differentially methylated CpG island whose deletion disrupts imprinting over a large domain, defining the locus as an imprinting control region.","evidence":"Polymorphism-based allele-specific expression in fetal tissue; deletion mapping in PWS patients with methylation and transcript analysis","pmids":["7512861","8111367","7987392"],"confidence":"High","gaps":["Mechanism by which the IC acts over hundreds of kilobases not resolved","Did not distinguish establishment from maintenance functions"]},{"year":1996,"claim":"Demonstrated that maternal silencing is a direct causal consequence of promoter CpG methylation, and that allele-specific methylation is maintained across diverse somatic tissues.","evidence":"In vitro methylation of a promoter reporter construct; methylation-sensitive Southern blot across multiple tissues; allele-specific chromatin accessibility analysis in PWS/AS cells","pmids":["9199937","8571960","10072422"],"confidence":"High","gaps":["Did not identify the methyl-reader proteins enforcing silencing","Mechanism linking methylation to chromatin compaction not yet defined"]},{"year":1996,"claim":"Linked alternative upstream non-coding SNRPN transcripts to imprint switching, providing a candidate mechanism for the germline epigenetic reprogramming defects in PWS/AS.","evidence":"cDNA cloning, allele-specific RT-PCR, and mutation analysis in AS/PWS patients with imprint switch failure","pmids":["8841186"],"confidence":"Medium","gaps":["Causal role of the transcripts vs underlying DNA elements not separated","Mechanism of imprint switching unresolved"]},{"year":1997,"claim":"Mapped the developmental dynamics of the imprint, showing two differentially methylated regions whose marks are erased in primordial germ cells and re-established sex-specifically during gametogenesis.","evidence":"Bisulfite sequencing of gametes and embryos, transgenic and methylase-deficient embryo analysis","pmids":["9294199"],"confidence":"High","gaps":["Enzymatic machinery establishing germline methylation not identified here","Sequence determinants of DMR specificity unknown"]},{"year":1999,"claim":"Resolved that the SNRPN promoter/exon 1 element functions both to establish the paternal imprint in the germline and to maintain it postzygotically, and that SmN loss is buffered by compensatory SmB'/B upregulation.","evidence":"Mosaic PWS patient and chimeric mouse ES cell deletion models with methylation analysis; Western blot of PWS brain","pmids":["10802660","10556313"],"confidence":"High","gaps":["Trans-acting maintenance factors not identified","Physiological extent of SmB'/B compensation across tissues unclear"]},{"year":2001,"claim":"Defined the chromatin and host-transcript architecture of the locus, connecting maternal methylation to histone H3 deacetylation and MeCP2 recruitment, and establishing the transcript as a snoRNA and UBE3A-antisense host.","evidence":"Allele-resolved ChIP and transgene-induced methylation in mice; cDNA cloning and Northern blot for snoRNA/antisense identification; targeted deletions defining functional boundaries","pmids":["11463825","11726556","11431693"],"confidence":"High","gaps":["Order of methylation, deacetylation, and MeCP2 binding not established","Functional roles of individual hosted snoRNAs not addressed"]},{"year":2002,"claim":"Uncovered a translational control layer in which the upstream SNURF ORF represses translation of the downstream SNRPN ORF within the bicistronic transcript.","evidence":"ENU-induced initiation-codon mutation in mice plus transfection assays with immunoblot quantification","pmids":["12075010"],"confidence":"High","gaps":["Physiological conditions modulating SNURF-mediated repression unknown","Mechanism of reinitiation/translational coupling not detailed"]},{"year":2005,"claim":"Identified the specific trans-acting factors and enhancer element driving paternal-allele transcription, providing the protein-level basis for allele-specific activation.","evidence":"In vivo footprinting, DNase I hypersensitivity mapping, ChIP, and reporter assays identifying NRF-1, YY1, Sp1, and RNA Pol II binding","pmids":["16116039"],"confidence":"High","gaps":["Hierarchy among NRF-1, YY1, and Sp1 not established","How methylation excludes these factors mechanistically not resolved"]},{"year":2016,"claim":"Extended SNRPN function beyond splicing to neuronal development, placing the nuclear receptor Nr4a1 as a downstream effector of SNRPN-controlled neurite and spine phenotypes.","evidence":"Gain- and loss-of-function in primary cortical neurons with phenotypic assays and Nr4a1 epistasis rescue","pmids":["27430727"],"confidence":"Medium","gaps":["Molecular mechanism by which SNRPN controls Nr4a1 levels unknown","Single-lab data without in vivo confirmation"]},{"year":2019,"claim":"Showed that adult neural stem cell fate is gated by non-catalytic TET3 repression of SNRPN, linking SNRPN derepression to BMP2-driven astrocytic differentiation.","evidence":"ChIP for TET3 binding plus NSC-specific TET3 knockout with differentiation phenotype and BMP2 effector identification","pmids":["30979904"],"confidence":"Medium","gaps":["Non-catalytic mechanism inferred from catalytic mutants, not directly reconstituted","How SNRPN connects mechanistically to BMP2 signaling unresolved"]},{"year":null,"claim":"How the splicing function of SmN integrates with its non-splicing roles in neuronal development and stem cell fate, and the direct molecular substrates linking SNRPN to Nr4a1 and BMP2, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No defined RNA substrates connecting splicing activity to neuronal phenotypes","Mechanism by which SNRPN protein regulates downstream gene expression unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1,25]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[15,16]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1,11]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[10,14,17]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,14,24]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[15,16]}],"complexes":["snRNP (spliceosomal core Sm complex)"],"partners":["MECP2","NRF-1","YY1","SP1","TET3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P63162","full_name":"Small nuclear ribonucleoprotein-associated protein N","aliases":["Sm protein D","Sm-D","Sm protein N","Sm-N","SmN","Tissue-specific-splicing protein"],"length_aa":240,"mass_kda":24.6,"function":"May be involved in tissue-specific alternative RNA processing events","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P63162/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SNRPN","classification":"Not Classified","n_dependent_lines":16,"n_total_lines":1208,"dependency_fraction":0.013245033112582781},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SNRPN","total_profiled":1310},"omim":[{"mim_id":"616259","title":"SMALL NUCLEOLAR RNA HOST GENE 14; SNHG14","url":"https://www.omim.org/entry/616259"},{"mim_id":"616186","title":"H19/IGF2-IMPRINTING CONTROL REGION","url":"https://www.omim.org/entry/616186"},{"mim_id":"615547","title":"SCHAAF-YANG SYNDROME; SHFYNG","url":"https://www.omim.org/entry/615547"},{"mim_id":"612192","title":"ZFP57 ZINC FINGER PROTEIN; ZFP57","url":"https://www.omim.org/entry/612192"},{"mim_id":"611215","title":"PRADER-WILLI REGION NONCODING RNA 1; PWRN1","url":"https://www.omim.org/entry/611215"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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chromosome biology","url":"https://pubmed.ncbi.nlm.nih.gov/22801776","citation_count":12,"is_preprint":false},{"pmid":"8723064","id":"PMC_8723064","title":"Deletion of small nuclear ribonucleoprotein polypeptide N (SNRPN) in Prader-Willi syndrome detected by fluorescence in situ hybridization: two sibs with the typical phenotype without a cytogenetic deletion in chromosome 15q.","date":"1996","source":"American journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/8723064","citation_count":11,"is_preprint":false},{"pmid":"11281449","id":"PMC_11281449","title":"Clonal maintenance of imprinted expression of SNRPN and IPW in normal lymphocytes: correlation with allele-specific methylation of SNRPN intron 1 but not intron 7.","date":"2001","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11281449","citation_count":10,"is_preprint":false},{"pmid":"35071778","id":"PMC_35071778","title":"Is there any effect on imprinted genes H19, PEG3, and SNRPN during AOA?","date":"2022","source":"Open medicine (Warsaw, Poland)","url":"https://pubmed.ncbi.nlm.nih.gov/35071778","citation_count":9,"is_preprint":false},{"pmid":"9556048","id":"PMC_9556048","title":"Clinical management of a rare de novo translocation 46,X,t(Y;15) (p11.2 approximately 11.3;q11.2).ish t(Y;15)(DYZ3+,AMELY+,SNRPN+;D15Z+) found prenatally.","date":"1998","source":"Prenatal diagnosis","url":"https://pubmed.ncbi.nlm.nih.gov/9556048","citation_count":9,"is_preprint":false},{"pmid":"7845394","id":"PMC_7845394","title":"Mice lacking Snrpn expression show normal regulation of neuronal alternative splicing events.","date":"1994","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/7845394","citation_count":8,"is_preprint":false},{"pmid":"22711311","id":"PMC_22711311","title":"Molecular characterization of porcine NECD, SNRPN and UBE3A genes and imprinting status in the skeletal muscle of neonate pigs.","date":"2012","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/22711311","citation_count":8,"is_preprint":false},{"pmid":"29976200","id":"PMC_29976200","title":"ART manipulation after controlled ovarian stimulation may not increase the risk of abnormal expression and DNA methylation at some CpG sites of H19,IGF2 and SNRPN in foetuses: a pilot study.","date":"2018","source":"Reproductive biology and endocrinology : RB&E","url":"https://pubmed.ncbi.nlm.nih.gov/29976200","citation_count":8,"is_preprint":false},{"pmid":"17207798","id":"PMC_17207798","title":"Methylation status of the SNRPN and HUMARA genes in testicular biopsy samples.","date":"2007","source":"Fertility and sterility","url":"https://pubmed.ncbi.nlm.nih.gov/17207798","citation_count":8,"is_preprint":false},{"pmid":"10229769","id":"PMC_10229769","title":"Assessment of SNRPN expression as a molecular tool in the diagnosis of Prader-Willi syndrome.","date":"1999","source":"Molecular diagnosis : a journal devoted to the understanding of human disease through the clinical application of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/10229769","citation_count":8,"is_preprint":false},{"pmid":"23226156","id":"PMC_23226156","title":"Non-Coding RNAs at the Gnas and Snrpn-Ube3a Imprinted Gene Loci and Their Involvement in Hereditary Disorders.","date":"2012","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23226156","citation_count":8,"is_preprint":false},{"pmid":"10710442","id":"PMC_10710442","title":"Use of terminal transferase-dependent antisense RNA amplification to determine the transcription start site of the Snrpn gene in individual neurons.","date":"2000","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/10710442","citation_count":7,"is_preprint":false},{"pmid":"22967183","id":"PMC_22967183","title":"DNA methyltransferase 1 (Dnmt1) mutation affects Snrpn imprinting in the mouse male germ line.","date":"2012","source":"Genome","url":"https://pubmed.ncbi.nlm.nih.gov/22967183","citation_count":6,"is_preprint":false},{"pmid":"11733034","id":"PMC_11733034","title":"The mouse Snrpn minimal promoter and its human orthologue: activity and imprinting.","date":"2001","source":"Genes to cells : devoted to molecular & cellular mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/11733034","citation_count":6,"is_preprint":false},{"pmid":"27659333","id":"PMC_27659333","title":"Deletion of SNURF/SNRPN U1B and U1B* upstream exons in a child with developmental delay and excessive weight.","date":"2016","source":"Journal of genetics","url":"https://pubmed.ncbi.nlm.nih.gov/27659333","citation_count":6,"is_preprint":false},{"pmid":"28931827","id":"PMC_28931827","title":"Altered methylations of H19, Snrpn, Mest and Peg3 are reversible by developmental reprogramming in kidney tissue of ICSI-derived mice.","date":"2017","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/28931827","citation_count":6,"is_preprint":false},{"pmid":"35698757","id":"PMC_35698757","title":"IGF2R, KCNQ1, PLAGL1, and SNRPN DNA methylation is completed in bovine by the early antral follicle stage.","date":"2022","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/35698757","citation_count":5,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46388,"output_tokens":6236,"usd":0.116352,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15127,"output_tokens":4089,"usd":0.08893,"stage2_stop_reason":"end_turn"},"total_usd":0.205282,"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\": 1992,\n      \"finding\": \"Snrpn is maternally imprinted in mouse brain and heart, with expression exclusively from the paternal allele; the gene encodes a brain-enriched small nuclear ribonucleoprotein (snRNP)-associated polypeptide SmN involved in RNA splicing.\",\n      \"method\": \"RT-PCR allele-specific expression analysis in mouse brain; chromosomal mapping to mouse chromosome 7 (syntenic to human 15q11-13)\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated independently in two companion papers (PMID:1303276 and PMID:1303277) using allele-specific expression and chromosomal mapping; further confirmed by maternal duplication mouse model (PMID:1303278)\",\n      \"pmids\": [\"1303276\", \"1303277\", \"1303278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The SNRPN gene encodes the SmN protein involved in pre-mRNA splicing; SmN is a constitutive core snRNP protein closely related to SmB/B', replacing SmB/B' specifically in brain.\",\n      \"method\": \"cDNA cloning, gene expression analysis, protein characterization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — established by multiple independent labs, consistent with biochemical characterization of snRNP core protein function\",\n      \"pmids\": [\"8111367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Human SNRPN is exclusively expressed from the paternal allele (maternally imprinted) in fetal brain and heart, as demonstrated by sequence polymorphism analysis confirming maternal allele silencing.\",\n      \"method\": \"RT-PCR of expressed polymorphism, analysis of maternal DNA vs cDNA in fetal brain and heart\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal allele-specific expression confirmed by multiple independent labs using PWS/AS patient cells and polymorphism analysis\",\n      \"pmids\": [\"7512861\", \"8111367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Small deletions removing a differentially methylated CpG island at the 5' end of SNRPN (including exon alpha) cause loss of expression for SNRPN and flanking imprinted transcripts and alter methylation over hundreds of kilobases, defining a paternal imprinting control region (IC) at this locus.\",\n      \"method\": \"Deletion mapping in PWS patients, methylation analysis, transcript expression studies\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple PWS patient deletions characterized, replicated by multiple subsequent studies defining the imprinting center\",\n      \"pmids\": [\"7987392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The SNRPN CpG island (encompassing exon -1 and the transcription start site) is extensively methylated on the silent maternal allele and unmethylated on the expressed paternal allele across a wide range of fetal and adult somatic tissues; a downstream intronic region (intron 5) is preferentially methylated on the expressed paternal allele in somatic tissues and male germ cells but unmethylated in fetal oocytes.\",\n      \"method\": \"Methylation analysis by Southern blot with methylation-sensitive restriction enzymes; allele-specific methylation in multiple tissues\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple tissues and developmental stages analyzed, replicated in diagnostic studies by multiple independent labs\",\n      \"pmids\": [\"8571960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"In vitro methylation of the SNRPN promoter (260-bp fragment containing exon 1) completely abolishes promoter activity, demonstrating that silencing of the maternal allele is a direct consequence of CpG methylation of the promoter region.\",\n      \"method\": \"Functional promoter assay in transfected cells; in vitro methylation of promoter construct followed by reporter gene activity measurement\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro methylation + functional reporter assay, single lab but clear causal mechanism demonstrated\",\n      \"pmids\": [\"9199937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Alternative non-coding transcripts of SNRPN (novel upstream exons without protein-coding potential) are expressed from the paternal chromosome only and intragenic deletions/point mutations in these alternative transcripts are found in AS and PWS patients with imprint switch failure, indicating these transcripts are involved in imprint switching.\",\n      \"method\": \"cDNA cloning, RT-PCR allele-specific expression, mutation analysis in AS/PWS patients\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient mutation analysis combined with expression data, single main lab but consistent with other imprinting center studies\",\n      \"pmids\": [\"8841186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The mouse Snrpn gene has two differentially methylated regions: DMR1 (maternally methylated at 5' end, correlating inversely with paternal expression) and DMR2 (paternally methylated at 3' end). DMR1 is remethylated during oogenesis and DMR2 during spermatogenesis; both methylation patterns are erased in primordial germ cells at 12.5 dpc and re-established during gametogenesis.\",\n      \"method\": \"Bisulfite sequencing, methylation analysis of gametes and embryos, ES cell transfection and pronuclear injection experiments, methylase-deficient mouse embryo analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods including methylase-deficient embryos and transgenic experiments; replicated by subsequent structural studies\",\n      \"pmids\": [\"9294199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Western analysis demonstrates that SmB'/B levels are dramatically upregulated in PWS brain tissue in response to loss of SmN (SNRPN product), indicating a compensatory feedback loop that maintains stoichiometric levels of spliceosomal snRNP components.\",\n      \"method\": \"Western blot analysis of PWS brain tissue; comparative protein quantification\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein quantification in disease tissue, single lab, but clear compensatory relationship demonstrated\",\n      \"pmids\": [\"10556313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The SNRPN/Snrpn promoter and exon 1 region functions as the PWS-IC element required not only for establishment of the paternal imprint in the male germline but also for its postzygotic maintenance; deletion of this element causes acquisition of a maternal methylation imprint on the paternal chromosome in somatic cells.\",\n      \"method\": \"Analysis of mosaic PWS patient with IC deletion; generation of chimeric mice from ES cell lines with analogous deletion; methylation analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient plus mouse ES cell model with independent replication, dual function (establishment and maintenance) demonstrated\",\n      \"pmids\": [\"10802660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"DNA methylation at the Snrpn DMR1 is linked to deacetylation of histone H3 (at K9, K14, K18) but not H4 on the methylated maternal allele; the methyl-CpG-binding protein MeCP2 associates exclusively with the methylated maternal allele; experimentally induced methylation of the paternal allele leads to H3 underacetylation.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) with allele resolution by SSCP; transgene-induced methylation experiments; F1 mouse analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP with allele-specific resolution plus transgenic experiment demonstrating causality, multiple orthogonal methods\",\n      \"pmids\": [\"11463825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The IC-SNURF-SNRPN transcript serves as the host transcript for multiple snoRNAs (HBII-13, HBII-85, HBII-52, HBII-436, HBII-437, HBII-438A, HBII-438B) encoded within its introns, and also serves as an antisense transcript for UBE3A spanning more than 460 kb; Northern blot analysis indicates the snoRNAs are expressed by processing from these introns.\",\n      \"method\": \"cDNA cloning, Northern blot analysis, RT-PCR, genomic sequencing\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Northern blot plus RT-PCR plus sequence analysis establishing host transcript function; widely replicated\",\n      \"pmids\": [\"11726556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"A 0.9-kb deletion of mouse Snrpn exon 1 did not disrupt imprinting, but a larger 4.8-kb overlapping deletion caused partial/mosaic imprinting defects and perinatal lethality when paternally inherited, revealing that sequences beyond exon 1 within this region are required for imprinting center function.\",\n      \"method\": \"Targeted deletion in mice; methylation and gene expression analysis; phenotypic characterization\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via targeted deletion with clear phenotypic and molecular readouts; differential effect of two deletion sizes defines functional boundaries\",\n      \"pmids\": [\"11431693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"An ATG-to-AAG point mutation in the initiation codon of the upstream ORF (SNURF) in the bicistronic Snurf-Snrpn transcript causes a 15-fold or greater increase in translation of the downstream Snrpn ORF, providing evidence that SNURF upstream ORF normally suppresses translation of SNRPN through translational control.\",\n      \"method\": \"ENU mutagenesis screen; Northern blotting; immunoblotting; transfection assays with mutant constructs\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vivo mutation plus in vitro transfection with immunoblot quantification, multiple orthogonal methods demonstrating translational regulatory mechanism\",\n      \"pmids\": [\"12075010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The SNRPN 5' region contains two DNase I hypersensitive sites (DHS1 at the promoter and DHS2 in intron 1) exclusively on the paternal allele; in vivo footprinting and ChIP identified allele-specific interactions with NRF-1, YY1, Sp1, and unphosphorylated RNA Pol II at these sites, with DHS2 functioning as an enhancer of the SNRPN promoter.\",\n      \"method\": \"In vivo DNase I hypersensitivity mapping; in vivo footprinting; chromatin immunoprecipitation (ChIP); reporter gene assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods (in vivo footprinting, ChIP, reporter assay) in single study establishing allele-specific transcription factor binding and enhancer function\",\n      \"pmids\": [\"16116039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SNRPN protein regulates cortical neuron development: overexpression or knockdown impairs neurite outgrowth, neuron migration, and dendritic spine distribution. SNRPN controls the expression level of the nuclear receptor Nr4a1, and the spine development defects caused by SNRPN overexpression are fully rescued by Nr4a1 co-expression; knockdown of Nr4a1 or its antagonist DIM rescues SNRPN knockdown effects on neurite outgrowth.\",\n      \"method\": \"Overexpression and knockdown in primary cortical neurons; neurite outgrowth, migration and spine morphology assays; rescue experiments with Nr4a1 co-expression and pharmacological antagonism\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function and gain-of-function with specific phenotypic readouts plus epistasis rescue experiment, single lab\",\n      \"pmids\": [\"27430727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TET3 binds directly to the paternal transcribed allele of the imprinted Snrpn gene in adult neural stem cells (NSCs) through a non-catalytic mechanism, contributing to transcriptional repression of Snrpn; loss of this TET3-mediated repression leads to upregulation of SNRPN, which in turn promotes BMP2-mediated astrocytic terminal differentiation of NSCs.\",\n      \"method\": \"ChIP demonstrating TET3 binding to Snrpn locus; NSC-specific TET3 knockout with phenotypic readout (premature astrocyte differentiation); identification of BMP2 as SNRPN effector\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus genetic KO with cellular phenotype and effector identification, single lab, non-catalytic mechanism inferred from catalytic mutant experiments\",\n      \"pmids\": [\"30979904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Allele-specific differential chromatin conformation at SNRPN: the paternal allele (expressed) shows prominent DNase I hypersensitive sites flanking exon 1, while the maternal allele is completely inaccessible to nucleases at this region; regions of increased nuclease hypersensitivity on the maternal allele correlate with hypermethylation on the paternal allele at several sites.\",\n      \"method\": \"In vivo DNase I and Msp I hypersensitivity analysis on lymphoblastoid cell lines from PWS and AS individuals; allele-specific chromatin structure mapping\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo chromatin analysis with allele-specific resolution using PWS/AS cells as controls, single study but rigorous approach\",\n      \"pmids\": [\"10072422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Mice with maternal duplication for the Snrpn-containing chromosome 7 region do not express Snrpn, providing a genetic model for PWS and demonstrating that both copies must be maternally derived for silencing; the closely linked Gabrb3 locus is not subject to imprinting.\",\n      \"method\": \"Maternal duplication mouse model; RT-PCR expression analysis; genetic mapping\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via maternal duplication model with direct expression measurement, companion paper to two independent mapping studies\",\n      \"pmids\": [\"1303278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Mouse and human SNRPN/Snrpn gene structure is conserved with ten exons spanning 22 kb; the promoter contains a differentially methylated CpG island; intron 1 contains G-rich clustered repeats conserved between mouse and human that may play a role in establishing imprint-associated DNA methylation patterns.\",\n      \"method\": \"Genomic and cDNA characterization; methylation analysis in ES cells and adult tissues; structural conservation analysis between mouse and human\",\n      \"journal\": \"Mammalian genome\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — structural characterization with functional methylation analysis, single lab\",\n      \"pmids\": [\"9745031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Monoallelic (paternal-only) expression of SNRPN is maintained in human uterus and leiomyoma, demonstrating that the imprint is preserved in these smooth muscle tissues.\",\n      \"method\": \"RFLP analysis of SNRPN expression from genomic DNA and mRNA in 20 patients\",\n      \"journal\": \"Gynecologic and obstetric investigation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single RFLP-based expression analysis, limited mechanistic insight beyond imprint maintenance confirmation\",\n      \"pmids\": [\"8821886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Maternal and paternal genomes function independently in establishing parental-specific expression of Snrpn in mouse ova; both paternal Snrpn alleles are active in androgenetic ova and neither is active in gynogenetic ova, with no evidence for trans-allelic/genomic counting or exclusion mechanisms.\",\n      \"method\": \"Quantitative allele-specific RT-PCR single nucleotide primer extension in gynogenetic, androgenetic, triploid, and tetraploid ova; single blastomere analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative allele-specific assay in multiple experimental genotypes (gynogenotes, androgenotes, polyploids), single lab but rigorous genetic design\",\n      \"pmids\": [\"8947024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The conserved activator sequence (CAS) in Snrpn intron 1 has methylation-sensitive enhancer activity and shows developmentally dynamic changes in DNA methylation (not a germline DMR), suggesting it controls tissue-specific expression of IC transcripts.\",\n      \"method\": \"Methylation analysis of CAS across developmental stages; reporter gene assay demonstrating methylation-sensitive enhancer activity\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — functional reporter assay plus developmental methylation analysis, single lab\",\n      \"pmids\": [\"19095049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"An 85-kb murine Snrpn transgene (containing 33 kb of 5' and 30 kb of 3' flanking DNA) with two copies recapitulated imprinted expression, while a single copy did not, suggesting a 6.6-kb region of maternal-specific DNA methylation may be sufficient to confer imprinted expression in a copy-number-dependent manner; a 76-kb human SNRPN transgene was expressed biallelically in mice regardless of copy number.\",\n      \"method\": \"Transgenic mouse lines with murine and human SNRPN constructs; methylation and allele-specific expression analysis\",\n      \"journal\": \"Mammalian genome\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic analysis with multiple lines and allele-specific expression, single lab; copy-number dependence limits mechanistic conclusion\",\n      \"pmids\": [\"10341083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The Snrpn minimal promoter requires a 7 bp element (SBE) within the 76 bp exon 1 for activity in its unmethylated state; this element binds a specific protein and its mutation abolishes promoter function. The mouse Snrpn minimal promoter (84 bp upstream + exon 1) contains all elements necessary for activity and imprinting, while the orthologous human sequence lacks these functional elements.\",\n      \"method\": \"Transfection reporter assays; transgenic experiments with SBE mutants; chimeric mouse/human promoter constructs\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro promoter assay plus transgenic validation with mutagenesis, single lab; human/mouse divergence adds complexity\",\n      \"pmids\": [\"11733034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"C-reactive protein (CRP) binds to the Sm-D protein of snRNPs through a calcium-dependent, phosphocholine-inhibitable interaction mediated by the C-terminal region of Sm-D; deletion mapping demonstrated that the CRP binding domain resides in this C-terminal region which is also proposed to bind RNA.\",\n      \"method\": \"CRP binding assays with snRNP fractions; fusion protein pull-down; deletion mutant mapping\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — fusion protein deletion mutant mapping with specific inhibition controls (PC and EDTA), single lab\",\n      \"pmids\": [\"8502240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Mice lacking Snrpn expression die shortly after birth, but neuronal-specific alternative splicing of several different classes of protein RNAs proceeds normally in these mice, indicating that SmN is not required for the regulation of the tested neuronal-specific alternative splicing events.\",\n      \"method\": \"RT-PCR analysis of alternative splicing events in brain of non-expressing mice (maternal duplication model)\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific negative result: loss-of-function with multiple alternative splicing readouts; establishes that tested splicing events are SmN-independent\",\n      \"pmids\": [\"7845394\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SNRPN encodes the SmN protein, a core spliceosomal snRNP component that replaces SmB/B' in brain and is expressed exclusively from the paternal allele due to maternal imprinting enforced by CpG methylation of its promoter CpG island; the locus also serves as the host transcript for multiple snoRNAs and a long antisense transcript regulating UBE3A, and its 5' region functions as the PWS imprinting control center (IC) required for establishing and maintaining paternal epigenotypes across the 15q11-q13 domain through allele-specific chromatin organization involving NRF-1, YY1, Sp1, RNA Pol II binding, and histone H3 deacetylation linked to MeCP2 recruitment; at the cellular level, SNRPN protein regulates cortical neuron development and dendritic spine morphology through control of the nuclear receptor Nr4a1, and is subject to non-catalytic repression by TET3 in adult neural stem cells to prevent premature astrocytic differentiation via BMP2.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SNRPN encodes SmN, a brain-enriched core small nuclear ribonucleoprotein (snRNP) polypeptide closely related to and functionally substituting for SmB/B' in pre-mRNA splicing [#1]. SmN is not strictly required for the neuronal-specific alternative splicing events tested, and its loss in PWS brain triggers compensatory upregulation of SmB'/B that restores stoichiometric snRNP component levels [#26, #8]. The defining biological feature of SNRPN is its expression exclusively from the paternal allele, with the maternal allele silenced by CpG methylation of the promoter CpG island — methylation that directly abolishes promoter activity in reporter assays [#0, #2, #5]. The locus harbors the Prader-Willi syndrome imprinting control center: deletion of the differentially methylated 5' region disrupts SNRPN and flanking imprinted transcripts and perturbs methylation over hundreds of kilobases, and this element is required both for establishing the paternal imprint in the male germline and for its postzygotic maintenance [#3, #9, #12]. Allele-specific silencing operates through coordinated chromatin organization: the methylated maternal allele is nuclease-inaccessible, hypoacetylated at histone H3, and bound by MeCP2, whereas the paternal allele displays DNase I hypersensitive sites bound by NRF-1, YY1, Sp1, and unphosphorylated RNA Pol II [#10, #17, #14]. The IC-SNURF-SNRPN transcript additionally serves as the host for multiple intronic snoRNAs and as a >460-kb antisense transcript for UBE3A, while the upstream SNURF ORF translationally represses the downstream SNRPN ORF [#11, #13]. Beyond splicing, SNRPN protein regulates cortical neuron development, neurite outgrowth, migration, and dendritic spine morphology through control of the nuclear receptor Nr4a1, and is held in check in adult neural stem cells by non-catalytic TET3 binding that prevents premature BMP2-mediated astrocytic differentiation [#15, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established that Snrpn is a genomically imprinted gene expressed only from the paternal allele, defining it as a candidate locus for the parent-of-origin disorders mapping to this chromosomal region.\",\n      \"evidence\": \"Allele-specific RT-PCR in mouse brain/heart plus chromosomal mapping, with a maternal-duplication mouse model confirming silencing\",\n      \"pmids\": [\"1303276\", \"1303277\", \"1303278\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the cis-element enforcing the imprint\", \"Molecular identity of the silencing mark not yet established\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Identified the SNRPN gene product as SmN, a core snRNP protein that replaces SmB/B' in brain, assigning a concrete molecular function in pre-mRNA splicing.\",\n      \"evidence\": \"cDNA cloning and protein characterization in human tissue\",\n      \"pmids\": [\"8111367\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific splicing substrates of SmN not defined\", \"Functional consequence of SmN vs SmB/B' substitution in brain unresolved\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Confirmed paternal-only expression of human SNRPN and located a differentially methylated CpG island whose deletion disrupts imprinting over a large domain, defining the locus as an imprinting control region.\",\n      \"evidence\": \"Polymorphism-based allele-specific expression in fetal tissue; deletion mapping in PWS patients with methylation and transcript analysis\",\n      \"pmids\": [\"7512861\", \"8111367\", \"7987392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which the IC acts over hundreds of kilobases not resolved\", \"Did not distinguish establishment from maintenance functions\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Demonstrated that maternal silencing is a direct causal consequence of promoter CpG methylation, and that allele-specific methylation is maintained across diverse somatic tissues.\",\n      \"evidence\": \"In vitro methylation of a promoter reporter construct; methylation-sensitive Southern blot across multiple tissues; allele-specific chromatin accessibility analysis in PWS/AS cells\",\n      \"pmids\": [\"9199937\", \"8571960\", \"10072422\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the methyl-reader proteins enforcing silencing\", \"Mechanism linking methylation to chromatin compaction not yet defined\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Linked alternative upstream non-coding SNRPN transcripts to imprint switching, providing a candidate mechanism for the germline epigenetic reprogramming defects in PWS/AS.\",\n      \"evidence\": \"cDNA cloning, allele-specific RT-PCR, and mutation analysis in AS/PWS patients with imprint switch failure\",\n      \"pmids\": [\"8841186\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal role of the transcripts vs underlying DNA elements not separated\", \"Mechanism of imprint switching unresolved\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Mapped the developmental dynamics of the imprint, showing two differentially methylated regions whose marks are erased in primordial germ cells and re-established sex-specifically during gametogenesis.\",\n      \"evidence\": \"Bisulfite sequencing of gametes and embryos, transgenic and methylase-deficient embryo analysis\",\n      \"pmids\": [\"9294199\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymatic machinery establishing germline methylation not identified here\", \"Sequence determinants of DMR specificity unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Resolved that the SNRPN promoter/exon 1 element functions both to establish the paternal imprint in the germline and to maintain it postzygotically, and that SmN loss is buffered by compensatory SmB'/B upregulation.\",\n      \"evidence\": \"Mosaic PWS patient and chimeric mouse ES cell deletion models with methylation analysis; Western blot of PWS brain\",\n      \"pmids\": [\"10802660\", \"10556313\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trans-acting maintenance factors not identified\", \"Physiological extent of SmB'/B compensation across tissues unclear\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the chromatin and host-transcript architecture of the locus, connecting maternal methylation to histone H3 deacetylation and MeCP2 recruitment, and establishing the transcript as a snoRNA and UBE3A-antisense host.\",\n      \"evidence\": \"Allele-resolved ChIP and transgene-induced methylation in mice; cDNA cloning and Northern blot for snoRNA/antisense identification; targeted deletions defining functional boundaries\",\n      \"pmids\": [\"11463825\", \"11726556\", \"11431693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of methylation, deacetylation, and MeCP2 binding not established\", \"Functional roles of individual hosted snoRNAs not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Uncovered a translational control layer in which the upstream SNURF ORF represses translation of the downstream SNRPN ORF within the bicistronic transcript.\",\n      \"evidence\": \"ENU-induced initiation-codon mutation in mice plus transfection assays with immunoblot quantification\",\n      \"pmids\": [\"12075010\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological conditions modulating SNURF-mediated repression unknown\", \"Mechanism of reinitiation/translational coupling not detailed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified the specific trans-acting factors and enhancer element driving paternal-allele transcription, providing the protein-level basis for allele-specific activation.\",\n      \"evidence\": \"In vivo footprinting, DNase I hypersensitivity mapping, ChIP, and reporter assays identifying NRF-1, YY1, Sp1, and RNA Pol II binding\",\n      \"pmids\": [\"16116039\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchy among NRF-1, YY1, and Sp1 not established\", \"How methylation excludes these factors mechanistically not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended SNRPN function beyond splicing to neuronal development, placing the nuclear receptor Nr4a1 as a downstream effector of SNRPN-controlled neurite and spine phenotypes.\",\n      \"evidence\": \"Gain- and loss-of-function in primary cortical neurons with phenotypic assays and Nr4a1 epistasis rescue\",\n      \"pmids\": [\"27430727\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism by which SNRPN controls Nr4a1 levels unknown\", \"Single-lab data without in vivo confirmation\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed that adult neural stem cell fate is gated by non-catalytic TET3 repression of SNRPN, linking SNRPN derepression to BMP2-driven astrocytic differentiation.\",\n      \"evidence\": \"ChIP for TET3 binding plus NSC-specific TET3 knockout with differentiation phenotype and BMP2 effector identification\",\n      \"pmids\": [\"30979904\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Non-catalytic mechanism inferred from catalytic mutants, not directly reconstituted\", \"How SNRPN connects mechanistically to BMP2 signaling unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the splicing function of SmN integrates with its non-splicing roles in neuronal development and stem cell fate, and the direct molecular substrates linking SNRPN to Nr4a1 and BMP2, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No defined RNA substrates connecting splicing activity to neuronal phenotypes\", \"Mechanism by which SNRPN protein regulates downstream gene expression unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1, 25]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [15, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 11]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [10, 14, 17]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 14, 24]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [15, 16]}\n    ],\n    \"complexes\": [\"snRNP (spliceosomal core Sm complex)\"],\n    \"partners\": [\"MeCP2\", \"NRF-1\", \"YY1\", \"Sp1\", \"TET3\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}