{"gene":"SRY","run_date":"2026-06-10T07:46:41","timeline":{"discoveries":[{"year":1992,"finding":"Recombinant SRY protein binds the core DNA sequence AACAAAG in a sequence-dependent manner. Point mutations in the HMG box found in XY females abolished or reduced DNA binding activity in vitro, establishing that the DNA-binding activity of SRY is required for sex determination.","method":"In vitro DNA binding assay (gel retardation/EMSA) with recombinant wild-type and mutant SRY proteins; mutational analysis of HMG box in XY females","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis, replicated across multiple XY female patient mutations, foundational paper widely confirmed","pmids":["1734522"],"is_preprint":false},{"year":1992,"finding":"The HMG box of SRY recognizes four-way junction DNAs in a sequence-independent manner, and when SRY binds linear duplex DNA containing its specific target AACAAAG, it produces a sharp bend in the DNA, indicating that SRY functions as an architectural transcription factor that remodels DNA structure.","method":"In vitro DNA binding assays with four-way junction substrates and linear duplex DNA; gel electrophoresis-based DNA bending assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with multiple DNA substrates, foundational result widely cited and confirmed","pmids":["1425584"],"is_preprint":false},{"year":1992,"finding":"De novo point mutations in the HMG box of SRY (including a nonsense mutation converting tryptophan to a stop codon, and a missense glycine-to-arginine substitution) were identified in XY females but not in their unaffected fathers, establishing that loss-of-function mutations in SRY cause XY sex reversal.","method":"SSCP analysis and DNA sequencing of SRY in XY females; paternal controls sequenced to confirm de novo status","journal":"Human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function evidence in multiple independent patients with de novo mutations, replicated across multiple studies","pmids":["1339396","2247149"],"is_preprint":false},{"year":1993,"finding":"The adult mouse testis produces circular RNA molecules from the Sry locus as the predominant transcript; these circular RNAs are found in the cytoplasm but are not substantially associated with polysomes, indicating they are likely not efficiently translated and are distinct from the functional linear transcript in the genital ridge.","method":"cDNA cloning, 5' RACE, RNase protection, RT-PCR, oligonucleotide hybridization, RNase H digestion, polysome fractionation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal molecular methods in one study confirming circularity and cytoplasmic non-polysomal localization; replicated across mouse strains","pmids":["7684656"],"is_preprint":false},{"year":1993,"finding":"The SRY DNA-binding domain specifically recognizes with nanomolar affinity proximal upstream elements (SRYe) in the promoters of the sex-specific genes P450 aromatase and Müllerian inhibiting substance (MIS/AMH), and SRYe-binding activity is present in nuclear extracts from embryonic urogenital ridge at the time preceding testicular differentiation.","method":"In vitro DNA binding assay (EMSA/gel shift) with recombinant SRY HMG domain; nuclear extract binding assays from embryonic urogenital ridge","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding demonstrated with recombinant protein and native extracts; direct in vivo transcriptional activation of these targets by SRY was not confirmed in this study","pmids":["8430080"],"is_preprint":false},{"year":1994,"finding":"Mouse Sry is a transcriptional activator: the mouse Sry HMG box selectively binds NACAAT/AACAAT sequences in vitro; the mouse Sry gene activates transcription of reporter genes containing AACAAT binding sites; the activation function was mapped to a glutamine/histidine-rich domain separate from the HMG box DNA-binding domain; both human and mouse SRY contain nuclear localization signals. However, a GAL4–human SRY fusion did not cause transcriptional activation, suggesting species differences.","method":"Random oligonucleotide selection (SELEX-like), reporter gene cotransfection assays, GAL4 hybrid system, LexA fusion in yeast, nuclear localization assays with lacZ-SRY hybrids","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple assay types in one study; mouse Sry activation confirmed by multiple methods but human SRY gave negative result; single laboratory","pmids":["7838151"],"is_preprint":false},{"year":1994,"finding":"Purified SRY protein binds to specific DNA sequences upstream of the AMH promoter and displays DNA bending and cruciform DNA-binding activity, consistent with a role as an architectural transcription factor.","method":"Gel retardation analysis with recombinant SRY protein; cruciform DNA binding assays","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro biochemical assay with recombinant protein, single laboratory, confirmatory of earlier structural findings","pmids":["7826621"],"is_preprint":false},{"year":1994,"finding":"Purified SRY protein binds to a specific HMG-box response element in the rat fra-1 (Fos-related antigen 1) promoter and enhances transcription of fra-1 promoter constructs in cotransfection experiments, identifying fra-1 as a candidate transcriptional target.","method":"Gel retardation assay with purified SRY; reporter gene cotransfection","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single gel-shift and reporter cotransfection; direct in vivo relevance not established, single laboratory","pmids":["8183916"],"is_preprint":false},{"year":1995,"finding":"The Sry transcript expressed in the developing mouse genital ridge at the sex-determining stage is a linear, polyadenylated, single-exon mRNA restricted to the genital ridge and not detected in any other fetal or adult tissue, distinguishing it from the circular testis transcript and establishing its identity as the functional transcript for sex determination.","method":"RT-PCR, Northern blot, RNase protection assays with tissue-specific and stage-specific samples","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple molecular methods, tissue specificity confirmed, replicated by independent groups","pmids":["7670499"],"is_preprint":false},{"year":1996,"finding":"The HMG box domain of SRY binds calmodulin (CaM) in a calcium-dependent manner, with 1:1 stoichiometry and a conformational change in SRY. The SRY/CaM complex formation is specifically inhibited by the SRY DNA-binding site AACAAT but not a mutated sequence, suggesting that CaM and DNA compete for HMG box binding and that CaM may regulate SRY DNA-binding activity.","method":"Affinity chromatography, native gel electrophoresis, fluorescence spectroscopy; peptide binding experiments","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — multiple in vitro biochemical methods; functional significance in vivo inferred but not directly tested in this study","pmids":["8706923"],"is_preprint":false},{"year":2000,"finding":"Sry expression induces a dramatic increase in somatic cell proliferation in the XY gonad, initially in the coelomic epithelium (SF1-positive cells contributing to the Sertoli cell population), with a second stage in SF1-negative cells. Both stages of proliferation are dependent on Sry and independent of X chromosome dosage or other Y-linked genes. This proliferative response begins less than 24 hours after Sry onset and is the earliest identified effect of Sry expression.","method":"BrdU incorporation to label dividing cells in vivo; comparison of XY vs. XX gonads; genetic epistasis with Y chromosome variants","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct cell proliferation assay in vivo, genetic controls, replicated with multiple strain combinations","pmids":["10654601"],"is_preprint":false},{"year":2001,"finding":"SRY directly interacts with the androgen receptor (AR) through the AR DNA-binding domain and the SRY HMG box, as demonstrated by mammalian one- and two-hybrid experiments and GST pull-down assays. Coexpression of SRY with AR causes marked repression of AR transcriptional activity on androgen-responsive reporters. SRY protein expression is increased by the androgen-liganded AR.","method":"Mammalian one- and two-hybrid assays; GST pull-down; reporter gene cotransfection in LNCaP cells; stable SRY transfection","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays plus functional reporter assay; single laboratory, two orthogonal methods","pmids":["11585838"],"is_preprint":false},{"year":2002,"finding":"SRY (and its HMG domain specifically) colocalizes with splicing factors in the nucleus and is dynamically redistributed following splicing blockage in living cells. Recombinant SRY HMG domain efficiently restores splicing activity in SOX6-depleted nuclear extracts, revealing an unexpected role for SRY in pre-mRNA splicing.","method":"Cell imaging/colocalization with splicing factor antibodies; in vitro splicing assay with nuclear extracts; antibody supershift of spliceosome; complementation with recombinant SRY HMG domain","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro splicing reconstitution plus live-cell imaging; two orthogonal methods; single laboratory","pmids":["11818535"],"is_preprint":false},{"year":2004,"finding":"SRY interacts with the histone acetyltransferase p300, which acetylates SRY in vitro and in vivo at a single conserved lysine residue. Acetylation promotes nuclear localization of SRY by enhancing its interaction with importin-β. Deacetylation by HDAC3 causes cytoplasmic relocalization of SRY. These modifications regulate SRY nuclear/cytoplasmic distribution during gonadal development.","method":"Co-immunoprecipitation; in vitro and in vivo acetylation assays; importin-β binding assays; subcellular localization by immunofluorescence; expression profiling of p300 and HDAC3 during gonadal development","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay, in vivo modification confirmed, functional nuclear transport consequence demonstrated; single laboratory but multiple orthogonal methods","pmids":["15297880"],"is_preprint":false},{"year":2004,"finding":"SRY (mouse) interacts directly with the KRAB-only protein KRAB-O (encoded by an alternatively spliced transcript of the Zfp208 locus), mapped to the bridge region outside the HMG box. Through KRAB-O, SRY associates indirectly with KAP1 and heterochromatin protein 1 (HP1), colocalizing in nuclear dots in gonadal cells, suggesting SRY uses the KRAB-KAP1-HP1 regulatory complex to control downstream targets.","method":"Yeast two-hybrid screen; GST pull-down; co-immunoprecipitation in COS7 cells; indirect immunofluorescence and confocal microscopy in primary fetal gonadal cells","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by GST pull-down and co-IP, with colocalization in relevant primary cells; single laboratory","pmids":["15469996"],"is_preprint":false},{"year":2004,"finding":"SRY is expressed transiently and exclusively in all cells fated to become Sertoli cells in the mouse gonad. SRYMYC-positive cells first appear in the gonad (not in the coelomic epithelium), then become SRYMYC/SOX9-double-positive for only a few hours before turning into SOX9-single-positive Sertoli cells. This establishes that SRY acts after the decision to become supporting (versus interstitial) cells, and its transient expression up-regulates SOX9 to determine Sertoli cell fate.","method":"Transgenic mice with Sry promoter-driven hPLAP (stable lineage reporter) and Myc-tagged SRY; immunofluorescence double labeling; lineage tracing","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct transgenic lineage tracing with two independent transgene reporters; functional consequence (Sertoli cell fate) established in vivo","pmids":["15385158"],"is_preprint":false},{"year":2008,"finding":"Human SRY represses beta-catenin-mediated TCF-dependent transcription. SRY interacts directly with beta-catenin in vitro, and SRY expression triggers beta-catenin localization into specific nuclear bodies. The inhibitory activity does not require SRY DNA-binding or transactivation functions (mutant SRY proteins defective in DNA-binding retained near wild-type inhibitory activity), but requires nuclear localization of SRY.","method":"Reporter gene assays in HEK293T cells with constitutively active beta-catenin; GST pull-down (in vitro interaction); immunofluorescence for beta-catenin localization; domain-mapping with patient-derived SRY mutants","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro pull-down and cell-based reporter assay with functional mutagenesis; single laboratory, two orthogonal methods","pmids":["18598779"],"is_preprint":false},{"year":2008,"finding":"The ability of Sry to induce testis development is limited to a critical ~6-hour window around 11.0–11.25 dpc. Activation of an inducible Sry transgene after 11.3 dpc fails to maintain Sox9 activation and results in ovarian development. This window is delimited by the ability to engage the high-FGF9/low-WNT4 signaling states required for Sertoli cell establishment.","method":"Inducible transgenic mouse system (Hsp70.3 promoter-Sry); heat-shock induction at timed intervals; analysis of Sox9 expression, gonadal histology, and FGF9/WNT4 signaling states","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct in vivo temporal control experiment with inducible transgene; pathway placement via FGF9/WNT4 epistasis; rigorous genetic design","pmids":["19036799"],"is_preprint":false},{"year":2009,"finding":"SRY directly binds a testis-specific enhancer of Sox9 (TES) and activates Sox9 expression in cooperation with the nuclear receptor steroidogenic factor 1 (SF1), as established by chromatin immunoprecipitation and functional assays. This co-operative action constitutes the primary mechanism by which SRY initiates the male sex-determination cascade.","method":"Chromatin immunoprecipitation (ChIP); reporter gene assays; genetic epistasis in transgenic/knockout mice","journal":"The international journal of biochemistry & cell biology (review citing primary data)","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct SRY binding to Sox9 enhancer, functional cooperation with SF1 confirmed in vivo; replicated across laboratories","pmids":["20005972"],"is_preprint":false},{"year":2009,"finding":"SRY activates monoamine oxidase A (MAO A) transcription by binding a functional SRY-binding site in the MAO A core promoter (validated by EMSA and ChIP) and forming a transcriptional complex with Sp1 (shown by co-immunoprecipitation and ChIP). SRY activates both MAO A promoter activity and catalytic activity in male neuroblastoma cells.","method":"EMSA; ChIP; co-immunoprecipitation; reporter gene assays; MAO A catalytic activity assay in BE(2)C cells","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and ChIP for direct binding confirmed; co-IP for SRY-Sp1 complex; functional reporter and enzymatic assay; single laboratory","pmids":["19661285"],"is_preprint":false},{"year":2009,"finding":"SRY (both human and mouse) binds directly to beta-catenin via the HMG box (human) or HMG box plus glutamine-rich domain (mouse), and represses Rspo1/Wnt/beta-catenin signaling. The repression activity varies among SRY proteins and paradoxically correlates with the presence and/or size of an acidic/glutamine-rich domain.","method":"Reporter gene cotransfection assays; GST pull-down and direct binding assays for SRY-beta-catenin interaction; domain deletion/mutation analysis","journal":"Journal of genetics and genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding and functional reporter assays with domain mapping; corroborates findings from PMID 18598779; single laboratory","pmids":["19376480"],"is_preprint":false},{"year":2009,"finding":"Chromatin immunoprecipitation identified cerebellin 4 precursor (Cbln4) as a direct in vivo target gene of SRY: anti-SRY antibody precipitated the Cbln4 upstream regulatory region. Ectopic SRY up-regulation in vivo induced ectopic Cbln4 expression, and Cbln4 expression is also regulated by SOX9 in the developing gonad.","method":"Chromatin immunoprecipitation (ChIP) with anti-SRY antibody; in vivo ectopic SRY expression experiments; Sox9 gain/loss-of-function transgenic mice","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP evidence for direct binding in vivo; ectopic expression rescue experiment; single laboratory","pmids":["19211811"],"is_preprint":false},{"year":2012,"finding":"GADD45G promotes Sry expression in gonadal somatic cells via a signaling cascade: GADD45G → p38 MAPK → GATA4 → SRY. In Gadd45g mutant mice, Sry expression is delayed and reduced; GATA4 binding to the Sry promoter in vivo is impaired and MAPK-dependent. The Sry promoter remains demethylated and carries active histone marks in mutants, placing the defect at the signaling/transcription factor level rather than epigenetic silencing.","method":"Gadd45g knockout mouse; genetic epistasis; p38 MAPK signaling analysis; ChIP for GATA4 on Sry promoter; promoter methylation analysis; histone modification ChIP","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis with knockout mouse, ChIP for transcription factor binding, signaling pathway dissection; multiple orthogonal methods","pmids":["23102581"],"is_preprint":false},{"year":2012,"finding":"WDR5 is a direct transcriptional target of SRY: EMSA and ChIP assays show SRY binds the WDR5 promoter directly. Conditional SRY expression induces WDR5 transcription with enrichment of SRY on the promoter. WDR5 and SRY interact and colocalize in cells. The WDR5-SRY complex activates Sox9 expression while repressing beta-catenin.","method":"EMSA; ChIP; 4-hydroxytamoxifen-inducible SRY expression system; co-immunoprecipitation; immunofluorescence colocalization; reporter gene assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and ChIP for direct SRY binding to WDR5 promoter; co-IP for protein interaction; conditional SRY system; single laboratory","pmids":["22523547"],"is_preprint":false},{"year":2013,"finding":"Sry directly upregulates Sgf29 (a SAGA complex component) by binding HMG-box sequences in the proximal Sgf29 promoter, as demonstrated by luciferase reporter and ChIP assays. Knockdown of Sry reduces anchorage-independent growth and tumorigenicity in male rodent hepatocellular carcinoma cells, revealing an oncogenic function of Sry mediated through Sgf29.","method":"Luciferase reporter assay; chromatin immunoprecipitation (ChIP); Sry siRNA knockdown; ectopic Sry expression; anchorage-independent growth and tumorigenicity assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding by ChIP plus functional loss-of-function and gain-of-function assays; single laboratory","pmids":["23893245"],"is_preprint":false},{"year":2020,"finding":"Mouse Sry harbors a cryptic second exon, producing a two-exon Sry transcript (Sry-T). SRY-T protein is expressed predominantly because SRY-S (single-exon) contains a C-terminal degron absent in SRY-T. XY mice lacking Sry-T are sex-reversed, and ectopic expression of Sry-T in XX mice induces male development, establishing SRY-T as the bona fide testis-determining factor in mice.","method":"Identification of cryptic exon; transgenic mouse experiments (Sry-T knockout and XX overexpression); Western blot comparing SRY-S vs SRY-T protein levels; protein stability/degron analysis","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout and transgenic rescue experiments in mice; protein stability mechanism demonstrated; published in high-tier journal with multiple orthogonal approaches","pmids":["33004521"],"is_preprint":false},{"year":2009,"finding":"WT1(+KTS) isoform regulates Sry expression cell-autonomously: XY Wt1(+KTS)-null mouse gonads show reduced SRY protein per cell and fewer SRY-expressing cells, correlating with decreased cell proliferation near the coelomic epithelium. This blocks Sertoli cell differentiation (loss of SOX9 and Fgf9), which is rescued by exogenous recombinant FGF9 ex vivo, placing WT1(+KTS) upstream of SRY, and SRY upstream of FGF9/Sertoli differentiation.","method":"Immunofluorescence; cell proliferation analysis in Wt1(+KTS)-null XY gonads; ex vivo gonad culture with recombinant FGF9; SOX9, Fgf9, and AMH expression analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with in vivo phenotype, ex vivo rescue experiment, multiple downstream markers assessed; genetic epistasis established","pmids":["19549635"],"is_preprint":false}],"current_model":"SRY encodes an HMG box transcription factor that bends DNA and binds the sequence AACAAAG; it is acetylated by p300 at a conserved lysine (promoting nuclear import via importin-β) and deacetylated by HDAC3 (triggering cytoplasmic relocalization), placing it in a regulated nuclear transport cycle; in a critical ~6-hour window around 11.0–11.25 dpc in mice, transiently expressed SRY (specifically SRY-T, the two-exon isoform) binds a testis-specific enhancer of Sox9 cooperatively with SF1 to directly activate Sox9 transcription, thereby committing supporting cell precursors to become Sertoli cells; upstream, WT1(+KTS) and a GADD45G→p38 MAPK→GATA4 cascade are required for sufficient Sry expression; beyond gonadal sex determination, SRY activates MAO A transcription via an Sp1 complex, represses Wnt/β-catenin signaling by direct β-catenin interaction, interacts with the androgen receptor to repress its transcriptional activity, participates in pre-mRNA splicing through its HMG domain, and associates with the KRAB-KAP1-HP1 heterochromatin complex via KRAB-O."},"narrative":{"mechanistic_narrative":"SRY is the mammalian testis-determining factor, an HMG-box transcription factor that initiates the male sex-determination cascade by committing bipotential supporting-cell precursors to the Sertoli cell fate [PMID:15385158, PMID:20005972]. It binds the core sequence AACAAAG in a sequence-specific manner and acts as an architectural factor that sharply bends target DNA; HMG-box point mutations found in XY females abolish DNA binding and cause XY sex reversal, establishing that this activity is required for sex determination [PMID:1734522, PMID:1425584, PMID:1339396, PMID:2247149]. In a narrow ~6-hour window around 11.0–11.25 dpc in the mouse gonad, transiently expressed SRY binds a testis-specific enhancer of Sox9 (TES) cooperatively with steroidogenic factor 1 (SF1) to directly activate Sox9, driving Sertoli cell differentiation; activation outside this window fails to sustain Sox9 and yields ovarian development [PMID:19036799, PMID:20005972, PMID:15385158]. The functional sex-determining transcript is a linear, genital-ridge-restricted mRNA, distinct from the predominantly cytoplasmic circular Sry RNA of adult testis, and in the mouse the active product is the two-exon SRY-T isoform, which escapes a C-terminal degron present in the single-exon form [PMID:7670499, PMID:7684656, PMID:33004521]. SRY's earliest detectable effect is a Sry-dependent burst of somatic cell proliferation in the XY gonad [PMID:10654601]. Sufficient Sry expression depends on upstream inputs: the WT1(+KTS) isoform acting cell-autonomously and a GADD45G→p38 MAPK→GATA4 cascade that drives GATA4 binding to the Sry promoter [PMID:19549635, PMID:23102581]. SRY activity is controlled by a nuclear-transport cycle in which p300 acetylates a conserved lysine to promote importin-β-dependent nuclear import, while HDAC3 deacetylation triggers cytoplasmic relocalization [PMID:15297880]. Beyond gonadal targets, SRY directly binds and activates additional promoters including MAO A (via an Sp1 complex), WDR5, Cbln4, and Sgf29, and it represses Wnt/β-catenin/TCF signaling through direct β-catenin interaction independent of its DNA-binding function, and represses androgen receptor transcriptional activity through HMG-box-mediated binding [PMID:19661285, PMID:22523547, PMID:19211811, PMID:23893245, PMID:18598779, PMID:19376480, PMID:11585838].","teleology":[{"year":1992,"claim":"Established that SRY is a sequence-specific, architectural DNA-binding protein whose binding activity is genetically required for sex determination, answering how a Y-linked gene could act as a master switch.","evidence":"EMSA with recombinant wild-type and HMG-box-mutant SRY, four-way-junction and DNA-bending assays, and SSCP/sequencing of XY females identifying de novo loss-of-function mutations","pmids":["1734522","1425584","1339396","2247149"],"confidence":"High","gaps":["In vitro binding did not identify the physiological in vivo target","Did not establish whether SRY activates or represses transcription at native loci"]},{"year":1993,"claim":"Distinguished the functional linear sex-determining transcript from a predominantly cytoplasmic, non-polysomal circular Sry RNA in adult testis, clarifying which RNA species mediates sex determination.","evidence":"cDNA cloning, RACE, RNase protection, polysome fractionation in mouse testis; tissue/stage-specific Northern and RNase protection confirming a linear genital-ridge-restricted mRNA","pmids":["7684656","7670499"],"confidence":"High","gaps":["Function, if any, of the circular transcript not resolved","Did not address regulation of the linear transcript's temporal expression"]},{"year":1993,"claim":"Identified candidate sex-specific promoter targets (aromatase, MIS/AMH) recognized with nanomolar affinity by the SRY HMG domain, beginning the search for direct SRY targets.","evidence":"EMSA with recombinant SRY HMG domain and embryonic urogenital ridge nuclear extracts","pmids":["8430080"],"confidence":"Medium","gaps":["Direct in vivo transcriptional activation of these targets not demonstrated","Binding could reflect generic HMG-box recognition rather than physiological regulation"]},{"year":1994,"claim":"Showed that mouse Sry is a transcriptional activator with a separable Q/H-rich activation domain and nuclear localization signals, while a negative result for human SRY hinted at species differences in mechanism.","evidence":"SELEX-like site selection, reporter cotransfection, GAL4/LexA fusions, and lacZ-SRY nuclear localization assays","pmids":["7838151"],"confidence":"Medium","gaps":["Human SRY transactivation in the GAL4 system was negative and unexplained","Single-laboratory result not independently confirmed"]},{"year":1996,"claim":"Proposed a potential regulatory input on SRY DNA binding through calcium-dependent calmodulin binding to the HMG box.","evidence":"Affinity chromatography, native gel, and fluorescence spectroscopy showing 1:1 CaM/HMG-box binding competed by target DNA","pmids":["8706923"],"confidence":"Medium","gaps":["Physiological relevance in gonadal cells not tested","No in vivo evidence that CaM modulates SRY activity"]},{"year":2000,"claim":"Defined the earliest in vivo consequence of Sry expression as a Sry-dependent burst of gonadal somatic proliferation, linking the genetic switch to a cellular event.","evidence":"In vivo BrdU labeling comparing XY and XX gonads with Y-chromosome genetic controls","pmids":["10654601"],"confidence":"High","gaps":["Molecular mediators connecting SRY to proliferation not identified","Relationship between proliferation and Sertoli fate commitment unresolved at this stage"]},{"year":2004,"claim":"Established that SRY is expressed transiently and exclusively in the Sertoli cell lineage and up-regulates SOX9, placing SRY action downstream of supporting-cell specification and pinpointing its developmental role.","evidence":"Transgenic lineage tracing with Sry-promoter hPLAP and Myc-tagged SRY, double immunofluorescence for SRY and SOX9","pmids":["15385158"],"confidence":"High","gaps":["Did not demonstrate direct SRY binding to the Sox9 regulatory region","Transient nature of expression left timing constraints undefined"]},{"year":2004,"claim":"Revealed post-translational control of SRY localization, answering how the transient factor reaches the nucleus during its narrow activity window.","evidence":"Co-IP, in vitro/in vivo acetylation, importin-β binding, and immunofluorescence showing p300 acetylation promotes nuclear import and HDAC3 deacetylation drives cytoplasmic relocalization","pmids":["15297880"],"confidence":"High","gaps":["Whether acetylation status changes dynamically in vivo across the sex-determining window not directly shown","Single laboratory"]},{"year":2004,"claim":"Suggested SRY recruits chromatin/repressive machinery by interacting with KRAB-O to bridge to the KAP1-HP1 complex.","evidence":"Yeast two-hybrid, GST pull-down, co-IP in COS7, and confocal colocalization in primary fetal gonadal cells","pmids":["15469996"],"confidence":"Medium","gaps":["Functional consequence for any SRY target gene not demonstrated","Indirect (KRAB-O-bridged) association to KAP1/HP1 not reconstituted"]},{"year":2002,"claim":"Uncovered a non-transcriptional activity of SRY in pre-mRNA splicing mediated by its HMG domain, broadening its mechanistic repertoire.","evidence":"Live-cell colocalization with splicing factors and in vitro splicing complementation of SOX6-depleted extracts by recombinant SRY HMG domain","pmids":["11818535"],"confidence":"Medium","gaps":["Physiological splicing substrates of SRY unidentified","Relevance to sex determination not established"]},{"year":2008,"claim":"Defined a critical ~6-hour temporal window for SRY function, showing that timely engagement of the FGF9-high/WNT4-low state is required to lock in Sox9 and the male fate.","evidence":"Heat-shock-inducible Sry transgene activated at timed intervals with analysis of Sox9, gonadal histology, and FGF9/WNT4 states","pmids":["19036799"],"confidence":"High","gaps":["Molecular basis for the window's closure not fully resolved","Does not address human window timing"]},{"year":2008,"claim":"Showed SRY represses Wnt/β-catenin/TCF signaling through direct β-catenin binding independent of DNA-binding/transactivation, identifying a parallel anti-female-pathway activity.","evidence":"Reporter assays with active β-catenin in HEK293T, GST pull-down, β-catenin localization imaging, and patient-mutant domain mapping; corroborated for human and mouse SRY","pmids":["18598779","19376480"],"confidence":"Medium","gaps":["In vivo contribution of β-catenin repression to sex determination not quantified","Domain requirements differ between human and mouse SRY"]},{"year":2001,"claim":"Identified a direct SRY–androgen receptor interaction through which SRY represses AR transcriptional activity, suggesting cross-talk with steroid signaling.","evidence":"Mammalian one/two-hybrid, GST pull-down, and reporter assays in LNCaP cells","pmids":["11585838"],"confidence":"Medium","gaps":["Physiological context of SRY–AR repression unclear","Single laboratory, two methods"]},{"year":2009,"claim":"Provided the definitive direct mechanism for testis determination: SRY binds the Sox9 testis-specific enhancer cooperatively with SF1 to activate Sox9.","evidence":"ChIP for SRY at TES, reporter assays, and genetic epistasis in transgenic/knockout mice","pmids":["20005972"],"confidence":"High","gaps":["Stoichiometry and structure of the SRY/SF1 enhancer complex not resolved","Human enhancer cooperativity not directly tested here"]},{"year":2009,"claim":"Expanded the direct SRY target repertoire beyond the gonad (MAO A via an Sp1 complex, Cbln4) and into co-regulatory partners, indicating broader transcriptional roles.","evidence":"EMSA, ChIP, co-IP, reporter and MAO A catalytic assays in neuroblastoma cells; ChIP and ectopic-expression for Cbln4 in vivo","pmids":["19661285","19211811"],"confidence":"Medium","gaps":["Physiological significance of neuronal MAO A regulation by SRY not established","Single laboratory per target"]},{"year":2009,"claim":"Placed WT1(+KTS) cell-autonomously upstream of SRY and SRY upstream of FGF9/Sertoli differentiation, building the regulatory hierarchy around SRY.","evidence":"Wt1(+KTS)-null XY gonad analysis with proliferation and marker readouts plus ex vivo FGF9 rescue","pmids":["19549635"],"confidence":"High","gaps":["Direct mechanism by which WT1(+KTS) elevates SRY per cell not defined","Does not address whether SRY directly activates Fgf9"]},{"year":2012,"claim":"Defined the signaling pathway ensuring sufficient and timely Sry expression, distinguishing a signaling/transcription-factor defect from epigenetic silencing.","evidence":"Gadd45g knockout mice, genetic epistasis, p38 MAPK analysis, GATA4 ChIP on the Sry promoter, and promoter methylation/histone-mark analysis","pmids":["23102581"],"confidence":"High","gaps":["How GADD45G is itself triggered in pre-Sertoli cells not addressed","Conservation of the cascade in humans not tested"]},{"year":2012,"claim":"Identified WDR5 as a direct SRY target and SRY interactor whose complex with SRY both activates Sox9 and represses β-catenin, integrating SRY's dual activating/repressing outputs.","evidence":"EMSA, ChIP, inducible SRY expression, co-IP, colocalization, and reporter assays","pmids":["22523547"],"confidence":"Medium","gaps":["In vivo requirement of WDR5 for SRY-driven Sox9 activation not shown","Single laboratory"]},{"year":2013,"claim":"Revealed an oncogenic SRY function in male hepatocellular carcinoma through direct activation of the SAGA component Sgf29.","evidence":"Luciferase reporter, ChIP, Sry knockdown/overexpression, and anchorage-independent growth/tumorigenicity assays","pmids":["23893245"],"confidence":"Medium","gaps":["Relevance to human SRY in cancer not established","Mechanism linking Sgf29 to transformation incomplete"]},{"year":2020,"claim":"Redefined the bona fide mouse testis-determining product as the two-exon SRY-T isoform, explaining why the protein accumulates: SRY-T lacks a C-terminal degron present in the single-exon form.","evidence":"Cryptic-exon identification, Sry-T knockout and XX overexpression transgenics, and Western/protein-stability analysis","pmids":["33004521"],"confidence":"High","gaps":["Whether an analogous isoform/degron mechanism operates in humans not established","Targets specifically requiring SRY-T versus SRY-S not enumerated"]},{"year":null,"claim":"How SRY achieves target specificity in vivo despite generic HMG-box DNA recognition, and how its activating versus repressing outputs are coordinated within the brief activity window, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the SRY/SF1/enhancer complex on Sox9 TES","Mechanism partitioning SRY between transcription, β-catenin repression, and splicing roles unknown","Human counterparts of the mouse SRY-T degron mechanism and GADD45G cascade untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,4,18,19,23,24]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[5,18,19,24]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[16,20,11]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[13,15,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,13]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[15,17,18,26]},{"term_id":"R-HSA-74160","term_label":"Gene expression 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It is necessary and sufficient for initiating male sex determination by directing the development of supporting cell precursors (pre-Sertoli cells) as Sertoli rather than granulosa cells (PubMed:16414182, PubMed:16996051). Involved in different aspects of gene regulation including promoter activation or repression (PubMed:9525897). Binds to the DNA consensus sequence 5'-[AT]AACAA[AT]-3' (PubMed:11563911, PubMed:1425584, PubMed:15170344, PubMed:8159753, PubMed:8265659). SRY HMG box recognizes DNA by partial intercalation in the minor groove and promotes DNA bending (PubMed:11563911, PubMed:1425584, PubMed:15170344, PubMed:16762365, PubMed:8159753, PubMed:8265659). Also involved in pre-mRNA splicing (PubMed:11818535). 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England)","url":"https://pubmed.ncbi.nlm.nih.gov/11278224","citation_count":36,"is_preprint":false},{"pmid":"16264091","id":"PMC_16264091","title":"Ontogeny and cellular localization of SRY transcripts in the human testes and its detection in spermatozoa.","date":"2005","source":"Reproduction (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/16264091","citation_count":36,"is_preprint":false},{"pmid":"8570683","id":"PMC_8570683","title":"The molecular genetics of Sry and its role in mammalian sex determination.","date":"1995","source":"Philosophical transactions of the Royal Society of London. Series B, Biological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/8570683","citation_count":34,"is_preprint":false},{"pmid":"28942012","id":"PMC_28942012","title":"Activation of SRY accounts for male-specific hepatocarcinogenesis: Implication in gender disparity of hepatocellular carcinoma.","date":"2017","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/28942012","citation_count":32,"is_preprint":false},{"pmid":"11404013","id":"PMC_11404013","title":"Molecular evolution of Sry and Sox gene.","date":"2001","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/11404013","citation_count":30,"is_preprint":false},{"pmid":"22161124","id":"PMC_22161124","title":"SRY protein function in sex determination: thinking outside the box.","date":"2012","source":"Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology","url":"https://pubmed.ncbi.nlm.nih.gov/22161124","citation_count":30,"is_preprint":false},{"pmid":"7766412","id":"PMC_7766412","title":"Expression of the mouse testis-determining gene Sry in male preimplantation embryos.","date":"1995","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/7766412","citation_count":30,"is_preprint":false},{"pmid":"11301599","id":"PMC_11301599","title":"Sry, Sox9 and mammalian sex determination.","date":"2001","source":"EXS","url":"https://pubmed.ncbi.nlm.nih.gov/11301599","citation_count":29,"is_preprint":false},{"pmid":"24708242","id":"PMC_24708242","title":"Transient neuroprotection by SRY upregulation in dopamine cells following injury in males.","date":"2014","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/24708242","citation_count":29,"is_preprint":false},{"pmid":"7560873","id":"PMC_7560873","title":"Sry-negative XX sex reversal in the German shorthaired pointer dog.","date":"1995","source":"The Journal of heredity","url":"https://pubmed.ncbi.nlm.nih.gov/7560873","citation_count":29,"is_preprint":false},{"pmid":"8711208","id":"PMC_8711208","title":"The molecular biology of SRY and its role in sex determination in mammals.","date":"1995","source":"Reproduction, fertility, and development","url":"https://pubmed.ncbi.nlm.nih.gov/8711208","citation_count":28,"is_preprint":false},{"pmid":"14633256","id":"PMC_14633256","title":"Prenatal genotyping of RHD and SRY using maternal blood.","date":"2003","source":"Vox sanguinis","url":"https://pubmed.ncbi.nlm.nih.gov/14633256","citation_count":28,"is_preprint":false},{"pmid":"18271004","id":"PMC_18271004","title":"Characteristics of testicular dysgenesis syndrome and decreased expression of SRY and SOX9 in Frasier syndrome.","date":"2008","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/18271004","citation_count":28,"is_preprint":false},{"pmid":"21292996","id":"PMC_21292996","title":"Sry-box (Sox) transcription factors in gastrointestinal physiology and disease.","date":"2011","source":"American journal of physiology. Gastrointestinal and liver physiology","url":"https://pubmed.ncbi.nlm.nih.gov/21292996","citation_count":27,"is_preprint":false},{"pmid":"31758498","id":"PMC_31758498","title":"TAF and TDF attenuate liver fibrosis through NS5ATP9, TGFβ1/Smad3, and NF-κB/NLRP3 inflammasome signaling pathways.","date":"2019","source":"Hepatology international","url":"https://pubmed.ncbi.nlm.nih.gov/31758498","citation_count":25,"is_preprint":false},{"pmid":"23893245","id":"PMC_23893245","title":"The male-specific factor Sry harbors an oncogenic function.","date":"2013","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/23893245","citation_count":25,"is_preprint":false},{"pmid":"9115712","id":"PMC_9115712","title":"Analysis of the role of Amh and Fra1 in the Sry regulatory pathway.","date":"1996","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/9115712","citation_count":24,"is_preprint":false},{"pmid":"7516683","id":"PMC_7516683","title":"Transcription of circular and noncircular forms of Sry in mouse testes.","date":"1994","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/7516683","citation_count":24,"is_preprint":false},{"pmid":"8543013","id":"PMC_8543013","title":"A rainbow trout SRY-type gene expressed in pituitary glands.","date":"1995","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/8543013","citation_count":24,"is_preprint":false},{"pmid":"11990800","id":"PMC_11990800","title":"Evolution of the testis-determining gene--the rise and fall of SRY.","date":"2002","source":"Novartis Foundation symposium","url":"https://pubmed.ncbi.nlm.nih.gov/11990800","citation_count":23,"is_preprint":false},{"pmid":"22523547","id":"PMC_22523547","title":"Synergistic effect of SRY and its direct target, WDR5, on Sox9 expression.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22523547","citation_count":23,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":42890,"output_tokens":7171,"usd":0.118118,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16333,"output_tokens":6041,"usd":0.116345,"stage2_stop_reason":"end_turn"},"total_usd":0.234463,"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\": \"Recombinant SRY protein binds the core DNA sequence AACAAAG in a sequence-dependent manner. Point mutations in the HMG box found in XY females abolished or reduced DNA binding activity in vitro, establishing that the DNA-binding activity of SRY is required for sex determination.\",\n      \"method\": \"In vitro DNA binding assay (gel retardation/EMSA) with recombinant wild-type and mutant SRY proteins; mutational analysis of HMG box in XY females\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis, replicated across multiple XY female patient mutations, foundational paper widely confirmed\",\n      \"pmids\": [\"1734522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The HMG box of SRY recognizes four-way junction DNAs in a sequence-independent manner, and when SRY binds linear duplex DNA containing its specific target AACAAAG, it produces a sharp bend in the DNA, indicating that SRY functions as an architectural transcription factor that remodels DNA structure.\",\n      \"method\": \"In vitro DNA binding assays with four-way junction substrates and linear duplex DNA; gel electrophoresis-based DNA bending assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with multiple DNA substrates, foundational result widely cited and confirmed\",\n      \"pmids\": [\"1425584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"De novo point mutations in the HMG box of SRY (including a nonsense mutation converting tryptophan to a stop codon, and a missense glycine-to-arginine substitution) were identified in XY females but not in their unaffected fathers, establishing that loss-of-function mutations in SRY cause XY sex reversal.\",\n      \"method\": \"SSCP analysis and DNA sequencing of SRY in XY females; paternal controls sequenced to confirm de novo status\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function evidence in multiple independent patients with de novo mutations, replicated across multiple studies\",\n      \"pmids\": [\"1339396\", \"2247149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The adult mouse testis produces circular RNA molecules from the Sry locus as the predominant transcript; these circular RNAs are found in the cytoplasm but are not substantially associated with polysomes, indicating they are likely not efficiently translated and are distinct from the functional linear transcript in the genital ridge.\",\n      \"method\": \"cDNA cloning, 5' RACE, RNase protection, RT-PCR, oligonucleotide hybridization, RNase H digestion, polysome fractionation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal molecular methods in one study confirming circularity and cytoplasmic non-polysomal localization; replicated across mouse strains\",\n      \"pmids\": [\"7684656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The SRY DNA-binding domain specifically recognizes with nanomolar affinity proximal upstream elements (SRYe) in the promoters of the sex-specific genes P450 aromatase and Müllerian inhibiting substance (MIS/AMH), and SRYe-binding activity is present in nuclear extracts from embryonic urogenital ridge at the time preceding testicular differentiation.\",\n      \"method\": \"In vitro DNA binding assay (EMSA/gel shift) with recombinant SRY HMG domain; nuclear extract binding assays from embryonic urogenital ridge\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding demonstrated with recombinant protein and native extracts; direct in vivo transcriptional activation of these targets by SRY was not confirmed in this study\",\n      \"pmids\": [\"8430080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Mouse Sry is a transcriptional activator: the mouse Sry HMG box selectively binds NACAAT/AACAAT sequences in vitro; the mouse Sry gene activates transcription of reporter genes containing AACAAT binding sites; the activation function was mapped to a glutamine/histidine-rich domain separate from the HMG box DNA-binding domain; both human and mouse SRY contain nuclear localization signals. However, a GAL4–human SRY fusion did not cause transcriptional activation, suggesting species differences.\",\n      \"method\": \"Random oligonucleotide selection (SELEX-like), reporter gene cotransfection assays, GAL4 hybrid system, LexA fusion in yeast, nuclear localization assays with lacZ-SRY hybrids\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple assay types in one study; mouse Sry activation confirmed by multiple methods but human SRY gave negative result; single laboratory\",\n      \"pmids\": [\"7838151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Purified SRY protein binds to specific DNA sequences upstream of the AMH promoter and displays DNA bending and cruciform DNA-binding activity, consistent with a role as an architectural transcription factor.\",\n      \"method\": \"Gel retardation analysis with recombinant SRY protein; cruciform DNA binding assays\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro biochemical assay with recombinant protein, single laboratory, confirmatory of earlier structural findings\",\n      \"pmids\": [\"7826621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Purified SRY protein binds to a specific HMG-box response element in the rat fra-1 (Fos-related antigen 1) promoter and enhances transcription of fra-1 promoter constructs in cotransfection experiments, identifying fra-1 as a candidate transcriptional target.\",\n      \"method\": \"Gel retardation assay with purified SRY; reporter gene cotransfection\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single gel-shift and reporter cotransfection; direct in vivo relevance not established, single laboratory\",\n      \"pmids\": [\"8183916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The Sry transcript expressed in the developing mouse genital ridge at the sex-determining stage is a linear, polyadenylated, single-exon mRNA restricted to the genital ridge and not detected in any other fetal or adult tissue, distinguishing it from the circular testis transcript and establishing its identity as the functional transcript for sex determination.\",\n      \"method\": \"RT-PCR, Northern blot, RNase protection assays with tissue-specific and stage-specific samples\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple molecular methods, tissue specificity confirmed, replicated by independent groups\",\n      \"pmids\": [\"7670499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The HMG box domain of SRY binds calmodulin (CaM) in a calcium-dependent manner, with 1:1 stoichiometry and a conformational change in SRY. The SRY/CaM complex formation is specifically inhibited by the SRY DNA-binding site AACAAT but not a mutated sequence, suggesting that CaM and DNA compete for HMG box binding and that CaM may regulate SRY DNA-binding activity.\",\n      \"method\": \"Affinity chromatography, native gel electrophoresis, fluorescence spectroscopy; peptide binding experiments\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple in vitro biochemical methods; functional significance in vivo inferred but not directly tested in this study\",\n      \"pmids\": [\"8706923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Sry expression induces a dramatic increase in somatic cell proliferation in the XY gonad, initially in the coelomic epithelium (SF1-positive cells contributing to the Sertoli cell population), with a second stage in SF1-negative cells. Both stages of proliferation are dependent on Sry and independent of X chromosome dosage or other Y-linked genes. This proliferative response begins less than 24 hours after Sry onset and is the earliest identified effect of Sry expression.\",\n      \"method\": \"BrdU incorporation to label dividing cells in vivo; comparison of XY vs. XX gonads; genetic epistasis with Y chromosome variants\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct cell proliferation assay in vivo, genetic controls, replicated with multiple strain combinations\",\n      \"pmids\": [\"10654601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SRY directly interacts with the androgen receptor (AR) through the AR DNA-binding domain and the SRY HMG box, as demonstrated by mammalian one- and two-hybrid experiments and GST pull-down assays. Coexpression of SRY with AR causes marked repression of AR transcriptional activity on androgen-responsive reporters. SRY protein expression is increased by the androgen-liganded AR.\",\n      \"method\": \"Mammalian one- and two-hybrid assays; GST pull-down; reporter gene cotransfection in LNCaP cells; stable SRY transfection\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays plus functional reporter assay; single laboratory, two orthogonal methods\",\n      \"pmids\": [\"11585838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"SRY (and its HMG domain specifically) colocalizes with splicing factors in the nucleus and is dynamically redistributed following splicing blockage in living cells. Recombinant SRY HMG domain efficiently restores splicing activity in SOX6-depleted nuclear extracts, revealing an unexpected role for SRY in pre-mRNA splicing.\",\n      \"method\": \"Cell imaging/colocalization with splicing factor antibodies; in vitro splicing assay with nuclear extracts; antibody supershift of spliceosome; complementation with recombinant SRY HMG domain\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro splicing reconstitution plus live-cell imaging; two orthogonal methods; single laboratory\",\n      \"pmids\": [\"11818535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SRY interacts with the histone acetyltransferase p300, which acetylates SRY in vitro and in vivo at a single conserved lysine residue. Acetylation promotes nuclear localization of SRY by enhancing its interaction with importin-β. Deacetylation by HDAC3 causes cytoplasmic relocalization of SRY. These modifications regulate SRY nuclear/cytoplasmic distribution during gonadal development.\",\n      \"method\": \"Co-immunoprecipitation; in vitro and in vivo acetylation assays; importin-β binding assays; subcellular localization by immunofluorescence; expression profiling of p300 and HDAC3 during gonadal development\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay, in vivo modification confirmed, functional nuclear transport consequence demonstrated; single laboratory but multiple orthogonal methods\",\n      \"pmids\": [\"15297880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SRY (mouse) interacts directly with the KRAB-only protein KRAB-O (encoded by an alternatively spliced transcript of the Zfp208 locus), mapped to the bridge region outside the HMG box. Through KRAB-O, SRY associates indirectly with KAP1 and heterochromatin protein 1 (HP1), colocalizing in nuclear dots in gonadal cells, suggesting SRY uses the KRAB-KAP1-HP1 regulatory complex to control downstream targets.\",\n      \"method\": \"Yeast two-hybrid screen; GST pull-down; co-immunoprecipitation in COS7 cells; indirect immunofluorescence and confocal microscopy in primary fetal gonadal cells\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by GST pull-down and co-IP, with colocalization in relevant primary cells; single laboratory\",\n      \"pmids\": [\"15469996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SRY is expressed transiently and exclusively in all cells fated to become Sertoli cells in the mouse gonad. SRYMYC-positive cells first appear in the gonad (not in the coelomic epithelium), then become SRYMYC/SOX9-double-positive for only a few hours before turning into SOX9-single-positive Sertoli cells. This establishes that SRY acts after the decision to become supporting (versus interstitial) cells, and its transient expression up-regulates SOX9 to determine Sertoli cell fate.\",\n      \"method\": \"Transgenic mice with Sry promoter-driven hPLAP (stable lineage reporter) and Myc-tagged SRY; immunofluorescence double labeling; lineage tracing\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct transgenic lineage tracing with two independent transgene reporters; functional consequence (Sertoli cell fate) established in vivo\",\n      \"pmids\": [\"15385158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Human SRY represses beta-catenin-mediated TCF-dependent transcription. SRY interacts directly with beta-catenin in vitro, and SRY expression triggers beta-catenin localization into specific nuclear bodies. The inhibitory activity does not require SRY DNA-binding or transactivation functions (mutant SRY proteins defective in DNA-binding retained near wild-type inhibitory activity), but requires nuclear localization of SRY.\",\n      \"method\": \"Reporter gene assays in HEK293T cells with constitutively active beta-catenin; GST pull-down (in vitro interaction); immunofluorescence for beta-catenin localization; domain-mapping with patient-derived SRY mutants\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro pull-down and cell-based reporter assay with functional mutagenesis; single laboratory, two orthogonal methods\",\n      \"pmids\": [\"18598779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The ability of Sry to induce testis development is limited to a critical ~6-hour window around 11.0–11.25 dpc. Activation of an inducible Sry transgene after 11.3 dpc fails to maintain Sox9 activation and results in ovarian development. This window is delimited by the ability to engage the high-FGF9/low-WNT4 signaling states required for Sertoli cell establishment.\",\n      \"method\": \"Inducible transgenic mouse system (Hsp70.3 promoter-Sry); heat-shock induction at timed intervals; analysis of Sox9 expression, gonadal histology, and FGF9/WNT4 signaling states\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct in vivo temporal control experiment with inducible transgene; pathway placement via FGF9/WNT4 epistasis; rigorous genetic design\",\n      \"pmids\": [\"19036799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SRY directly binds a testis-specific enhancer of Sox9 (TES) and activates Sox9 expression in cooperation with the nuclear receptor steroidogenic factor 1 (SF1), as established by chromatin immunoprecipitation and functional assays. This co-operative action constitutes the primary mechanism by which SRY initiates the male sex-determination cascade.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP); reporter gene assays; genetic epistasis in transgenic/knockout mice\",\n      \"journal\": \"The international journal of biochemistry & cell biology (review citing primary data)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct SRY binding to Sox9 enhancer, functional cooperation with SF1 confirmed in vivo; replicated across laboratories\",\n      \"pmids\": [\"20005972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SRY activates monoamine oxidase A (MAO A) transcription by binding a functional SRY-binding site in the MAO A core promoter (validated by EMSA and ChIP) and forming a transcriptional complex with Sp1 (shown by co-immunoprecipitation and ChIP). SRY activates both MAO A promoter activity and catalytic activity in male neuroblastoma cells.\",\n      \"method\": \"EMSA; ChIP; co-immunoprecipitation; reporter gene assays; MAO A catalytic activity assay in BE(2)C cells\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and ChIP for direct binding confirmed; co-IP for SRY-Sp1 complex; functional reporter and enzymatic assay; single laboratory\",\n      \"pmids\": [\"19661285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SRY (both human and mouse) binds directly to beta-catenin via the HMG box (human) or HMG box plus glutamine-rich domain (mouse), and represses Rspo1/Wnt/beta-catenin signaling. The repression activity varies among SRY proteins and paradoxically correlates with the presence and/or size of an acidic/glutamine-rich domain.\",\n      \"method\": \"Reporter gene cotransfection assays; GST pull-down and direct binding assays for SRY-beta-catenin interaction; domain deletion/mutation analysis\",\n      \"journal\": \"Journal of genetics and genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding and functional reporter assays with domain mapping; corroborates findings from PMID 18598779; single laboratory\",\n      \"pmids\": [\"19376480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Chromatin immunoprecipitation identified cerebellin 4 precursor (Cbln4) as a direct in vivo target gene of SRY: anti-SRY antibody precipitated the Cbln4 upstream regulatory region. Ectopic SRY up-regulation in vivo induced ectopic Cbln4 expression, and Cbln4 expression is also regulated by SOX9 in the developing gonad.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) with anti-SRY antibody; in vivo ectopic SRY expression experiments; Sox9 gain/loss-of-function transgenic mice\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP evidence for direct binding in vivo; ectopic expression rescue experiment; single laboratory\",\n      \"pmids\": [\"19211811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GADD45G promotes Sry expression in gonadal somatic cells via a signaling cascade: GADD45G → p38 MAPK → GATA4 → SRY. In Gadd45g mutant mice, Sry expression is delayed and reduced; GATA4 binding to the Sry promoter in vivo is impaired and MAPK-dependent. The Sry promoter remains demethylated and carries active histone marks in mutants, placing the defect at the signaling/transcription factor level rather than epigenetic silencing.\",\n      \"method\": \"Gadd45g knockout mouse; genetic epistasis; p38 MAPK signaling analysis; ChIP for GATA4 on Sry promoter; promoter methylation analysis; histone modification ChIP\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis with knockout mouse, ChIP for transcription factor binding, signaling pathway dissection; multiple orthogonal methods\",\n      \"pmids\": [\"23102581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"WDR5 is a direct transcriptional target of SRY: EMSA and ChIP assays show SRY binds the WDR5 promoter directly. Conditional SRY expression induces WDR5 transcription with enrichment of SRY on the promoter. WDR5 and SRY interact and colocalize in cells. The WDR5-SRY complex activates Sox9 expression while repressing beta-catenin.\",\n      \"method\": \"EMSA; ChIP; 4-hydroxytamoxifen-inducible SRY expression system; co-immunoprecipitation; immunofluorescence colocalization; reporter gene assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and ChIP for direct SRY binding to WDR5 promoter; co-IP for protein interaction; conditional SRY system; single laboratory\",\n      \"pmids\": [\"22523547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Sry directly upregulates Sgf29 (a SAGA complex component) by binding HMG-box sequences in the proximal Sgf29 promoter, as demonstrated by luciferase reporter and ChIP assays. Knockdown of Sry reduces anchorage-independent growth and tumorigenicity in male rodent hepatocellular carcinoma cells, revealing an oncogenic function of Sry mediated through Sgf29.\",\n      \"method\": \"Luciferase reporter assay; chromatin immunoprecipitation (ChIP); Sry siRNA knockdown; ectopic Sry expression; anchorage-independent growth and tumorigenicity assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding by ChIP plus functional loss-of-function and gain-of-function assays; single laboratory\",\n      \"pmids\": [\"23893245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Mouse Sry harbors a cryptic second exon, producing a two-exon Sry transcript (Sry-T). SRY-T protein is expressed predominantly because SRY-S (single-exon) contains a C-terminal degron absent in SRY-T. XY mice lacking Sry-T are sex-reversed, and ectopic expression of Sry-T in XX mice induces male development, establishing SRY-T as the bona fide testis-determining factor in mice.\",\n      \"method\": \"Identification of cryptic exon; transgenic mouse experiments (Sry-T knockout and XX overexpression); Western blot comparing SRY-S vs SRY-T protein levels; protein stability/degron analysis\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout and transgenic rescue experiments in mice; protein stability mechanism demonstrated; published in high-tier journal with multiple orthogonal approaches\",\n      \"pmids\": [\"33004521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"WT1(+KTS) isoform regulates Sry expression cell-autonomously: XY Wt1(+KTS)-null mouse gonads show reduced SRY protein per cell and fewer SRY-expressing cells, correlating with decreased cell proliferation near the coelomic epithelium. This blocks Sertoli cell differentiation (loss of SOX9 and Fgf9), which is rescued by exogenous recombinant FGF9 ex vivo, placing WT1(+KTS) upstream of SRY, and SRY upstream of FGF9/Sertoli differentiation.\",\n      \"method\": \"Immunofluorescence; cell proliferation analysis in Wt1(+KTS)-null XY gonads; ex vivo gonad culture with recombinant FGF9; SOX9, Fgf9, and AMH expression analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with in vivo phenotype, ex vivo rescue experiment, multiple downstream markers assessed; genetic epistasis established\",\n      \"pmids\": [\"19549635\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SRY encodes an HMG box transcription factor that bends DNA and binds the sequence AACAAAG; it is acetylated by p300 at a conserved lysine (promoting nuclear import via importin-β) and deacetylated by HDAC3 (triggering cytoplasmic relocalization), placing it in a regulated nuclear transport cycle; in a critical ~6-hour window around 11.0–11.25 dpc in mice, transiently expressed SRY (specifically SRY-T, the two-exon isoform) binds a testis-specific enhancer of Sox9 cooperatively with SF1 to directly activate Sox9 transcription, thereby committing supporting cell precursors to become Sertoli cells; upstream, WT1(+KTS) and a GADD45G→p38 MAPK→GATA4 cascade are required for sufficient Sry expression; beyond gonadal sex determination, SRY activates MAO A transcription via an Sp1 complex, represses Wnt/β-catenin signaling by direct β-catenin interaction, interacts with the androgen receptor to repress its transcriptional activity, participates in pre-mRNA splicing through its HMG domain, and associates with the KRAB-KAP1-HP1 heterochromatin complex via KRAB-O.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SRY is the mammalian testis-determining factor, an HMG-box transcription factor that initiates the male sex-determination cascade by committing bipotential supporting-cell precursors to the Sertoli cell fate [#15, #18]. It binds the core sequence AACAAAG in a sequence-specific manner and acts as an architectural factor that sharply bends target DNA; HMG-box point mutations found in XY females abolish DNA binding and cause XY sex reversal, establishing that this activity is required for sex determination [#0, #1, #2]. In a narrow ~6-hour window around 11.0–11.25 dpc in the mouse gonad, transiently expressed SRY binds a testis-specific enhancer of Sox9 (TES) cooperatively with steroidogenic factor 1 (SF1) to directly activate Sox9, driving Sertoli cell differentiation; activation outside this window fails to sustain Sox9 and yields ovarian development [#17, #18, #15]. The functional sex-determining transcript is a linear, genital-ridge-restricted mRNA, distinct from the predominantly cytoplasmic circular Sry RNA of adult testis, and in the mouse the active product is the two-exon SRY-T isoform, which escapes a C-terminal degron present in the single-exon form [#8, #3, #25]. SRY's earliest detectable effect is a Sry-dependent burst of somatic cell proliferation in the XY gonad [#10]. Sufficient Sry expression depends on upstream inputs: the WT1(+KTS) isoform acting cell-autonomously and a GADD45G→p38 MAPK→GATA4 cascade that drives GATA4 binding to the Sry promoter [#26, #22]. SRY activity is controlled by a nuclear-transport cycle in which p300 acetylates a conserved lysine to promote importin-β-dependent nuclear import, while HDAC3 deacetylation triggers cytoplasmic relocalization [#13]. Beyond gonadal targets, SRY directly binds and activates additional promoters including MAO A (via an Sp1 complex), WDR5, Cbln4, and Sgf29, and it represses Wnt/β-catenin/TCF signaling through direct β-catenin interaction independent of its DNA-binding function, and represses androgen receptor transcriptional activity through HMG-box-mediated binding [#19, #23, #21, #24, #16, #20, #11].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established that SRY is a sequence-specific, architectural DNA-binding protein whose binding activity is genetically required for sex determination, answering how a Y-linked gene could act as a master switch.\",\n      \"evidence\": \"EMSA with recombinant wild-type and HMG-box-mutant SRY, four-way-junction and DNA-bending assays, and SSCP/sequencing of XY females identifying de novo loss-of-function mutations\",\n      \"pmids\": [\"1734522\", \"1425584\", \"1339396\", \"2247149\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro binding did not identify the physiological in vivo target\", \"Did not establish whether SRY activates or represses transcription at native loci\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Distinguished the functional linear sex-determining transcript from a predominantly cytoplasmic, non-polysomal circular Sry RNA in adult testis, clarifying which RNA species mediates sex determination.\",\n      \"evidence\": \"cDNA cloning, RACE, RNase protection, polysome fractionation in mouse testis; tissue/stage-specific Northern and RNase protection confirming a linear genital-ridge-restricted mRNA\",\n      \"pmids\": [\"7684656\", \"7670499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function, if any, of the circular transcript not resolved\", \"Did not address regulation of the linear transcript's temporal expression\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Identified candidate sex-specific promoter targets (aromatase, MIS/AMH) recognized with nanomolar affinity by the SRY HMG domain, beginning the search for direct SRY targets.\",\n      \"evidence\": \"EMSA with recombinant SRY HMG domain and embryonic urogenital ridge nuclear extracts\",\n      \"pmids\": [\"8430080\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct in vivo transcriptional activation of these targets not demonstrated\", \"Binding could reflect generic HMG-box recognition rather than physiological regulation\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Showed that mouse Sry is a transcriptional activator with a separable Q/H-rich activation domain and nuclear localization signals, while a negative result for human SRY hinted at species differences in mechanism.\",\n      \"evidence\": \"SELEX-like site selection, reporter cotransfection, GAL4/LexA fusions, and lacZ-SRY nuclear localization assays\",\n      \"pmids\": [\"7838151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Human SRY transactivation in the GAL4 system was negative and unexplained\", \"Single-laboratory result not independently confirmed\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Proposed a potential regulatory input on SRY DNA binding through calcium-dependent calmodulin binding to the HMG box.\",\n      \"evidence\": \"Affinity chromatography, native gel, and fluorescence spectroscopy showing 1:1 CaM/HMG-box binding competed by target DNA\",\n      \"pmids\": [\"8706923\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance in gonadal cells not tested\", \"No in vivo evidence that CaM modulates SRY activity\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined the earliest in vivo consequence of Sry expression as a Sry-dependent burst of gonadal somatic proliferation, linking the genetic switch to a cellular event.\",\n      \"evidence\": \"In vivo BrdU labeling comparing XY and XX gonads with Y-chromosome genetic controls\",\n      \"pmids\": [\"10654601\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mediators connecting SRY to proliferation not identified\", \"Relationship between proliferation and Sertoli fate commitment unresolved at this stage\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Established that SRY is expressed transiently and exclusively in the Sertoli cell lineage and up-regulates SOX9, placing SRY action downstream of supporting-cell specification and pinpointing its developmental role.\",\n      \"evidence\": \"Transgenic lineage tracing with Sry-promoter hPLAP and Myc-tagged SRY, double immunofluorescence for SRY and SOX9\",\n      \"pmids\": [\"15385158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not demonstrate direct SRY binding to the Sox9 regulatory region\", \"Transient nature of expression left timing constraints undefined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Revealed post-translational control of SRY localization, answering how the transient factor reaches the nucleus during its narrow activity window.\",\n      \"evidence\": \"Co-IP, in vitro/in vivo acetylation, importin-β binding, and immunofluorescence showing p300 acetylation promotes nuclear import and HDAC3 deacetylation drives cytoplasmic relocalization\",\n      \"pmids\": [\"15297880\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether acetylation status changes dynamically in vivo across the sex-determining window not directly shown\", \"Single laboratory\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Suggested SRY recruits chromatin/repressive machinery by interacting with KRAB-O to bridge to the KAP1-HP1 complex.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, co-IP in COS7, and confocal colocalization in primary fetal gonadal cells\",\n      \"pmids\": [\"15469996\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence for any SRY target gene not demonstrated\", \"Indirect (KRAB-O-bridged) association to KAP1/HP1 not reconstituted\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Uncovered a non-transcriptional activity of SRY in pre-mRNA splicing mediated by its HMG domain, broadening its mechanistic repertoire.\",\n      \"evidence\": \"Live-cell colocalization with splicing factors and in vitro splicing complementation of SOX6-depleted extracts by recombinant SRY HMG domain\",\n      \"pmids\": [\"11818535\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological splicing substrates of SRY unidentified\", \"Relevance to sex determination not established\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined a critical ~6-hour temporal window for SRY function, showing that timely engagement of the FGF9-high/WNT4-low state is required to lock in Sox9 and the male fate.\",\n      \"evidence\": \"Heat-shock-inducible Sry transgene activated at timed intervals with analysis of Sox9, gonadal histology, and FGF9/WNT4 states\",\n      \"pmids\": [\"19036799\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for the window's closure not fully resolved\", \"Does not address human window timing\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed SRY represses Wnt/β-catenin/TCF signaling through direct β-catenin binding independent of DNA-binding/transactivation, identifying a parallel anti-female-pathway activity.\",\n      \"evidence\": \"Reporter assays with active β-catenin in HEK293T, GST pull-down, β-catenin localization imaging, and patient-mutant domain mapping; corroborated for human and mouse SRY\",\n      \"pmids\": [\"18598779\", \"19376480\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo contribution of β-catenin repression to sex determination not quantified\", \"Domain requirements differ between human and mouse SRY\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified a direct SRY–androgen receptor interaction through which SRY represses AR transcriptional activity, suggesting cross-talk with steroid signaling.\",\n      \"evidence\": \"Mammalian one/two-hybrid, GST pull-down, and reporter assays in LNCaP cells\",\n      \"pmids\": [\"11585838\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological context of SRY–AR repression unclear\", \"Single laboratory, two methods\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Provided the definitive direct mechanism for testis determination: SRY binds the Sox9 testis-specific enhancer cooperatively with SF1 to activate Sox9.\",\n      \"evidence\": \"ChIP for SRY at TES, reporter assays, and genetic epistasis in transgenic/knockout mice\",\n      \"pmids\": [\"20005972\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structure of the SRY/SF1 enhancer complex not resolved\", \"Human enhancer cooperativity not directly tested here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Expanded the direct SRY target repertoire beyond the gonad (MAO A via an Sp1 complex, Cbln4) and into co-regulatory partners, indicating broader transcriptional roles.\",\n      \"evidence\": \"EMSA, ChIP, co-IP, reporter and MAO A catalytic assays in neuroblastoma cells; ChIP and ectopic-expression for Cbln4 in vivo\",\n      \"pmids\": [\"19661285\", \"19211811\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological significance of neuronal MAO A regulation by SRY not established\", \"Single laboratory per target\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed WT1(+KTS) cell-autonomously upstream of SRY and SRY upstream of FGF9/Sertoli differentiation, building the regulatory hierarchy around SRY.\",\n      \"evidence\": \"Wt1(+KTS)-null XY gonad analysis with proliferation and marker readouts plus ex vivo FGF9 rescue\",\n      \"pmids\": [\"19549635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism by which WT1(+KTS) elevates SRY per cell not defined\", \"Does not address whether SRY directly activates Fgf9\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the signaling pathway ensuring sufficient and timely Sry expression, distinguishing a signaling/transcription-factor defect from epigenetic silencing.\",\n      \"evidence\": \"Gadd45g knockout mice, genetic epistasis, p38 MAPK analysis, GATA4 ChIP on the Sry promoter, and promoter methylation/histone-mark analysis\",\n      \"pmids\": [\"23102581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GADD45G is itself triggered in pre-Sertoli cells not addressed\", \"Conservation of the cascade in humans not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified WDR5 as a direct SRY target and SRY interactor whose complex with SRY both activates Sox9 and represses β-catenin, integrating SRY's dual activating/repressing outputs.\",\n      \"evidence\": \"EMSA, ChIP, inducible SRY expression, co-IP, colocalization, and reporter assays\",\n      \"pmids\": [\"22523547\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo requirement of WDR5 for SRY-driven Sox9 activation not shown\", \"Single laboratory\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed an oncogenic SRY function in male hepatocellular carcinoma through direct activation of the SAGA component Sgf29.\",\n      \"evidence\": \"Luciferase reporter, ChIP, Sry knockdown/overexpression, and anchorage-independent growth/tumorigenicity assays\",\n      \"pmids\": [\"23893245\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relevance to human SRY in cancer not established\", \"Mechanism linking Sgf29 to transformation incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Redefined the bona fide mouse testis-determining product as the two-exon SRY-T isoform, explaining why the protein accumulates: SRY-T lacks a C-terminal degron present in the single-exon form.\",\n      \"evidence\": \"Cryptic-exon identification, Sry-T knockout and XX overexpression transgenics, and Western/protein-stability analysis\",\n      \"pmids\": [\"33004521\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether an analogous isoform/degron mechanism operates in humans not established\", \"Targets specifically requiring SRY-T versus SRY-S not enumerated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SRY achieves target specificity in vivo despite generic HMG-box DNA recognition, and how its activating versus repressing outputs are coordinated within the brief activity window, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the SRY/SF1/enhancer complex on Sox9 TES\", \"Mechanism partitioning SRY between transcription, β-catenin repression, and splicing roles unknown\", \"Human counterparts of the mouse SRY-T degron mechanism and GADD45G cascade untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 4, 18, 19, 23, 24]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [5, 18, 19, 24]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [16, 20, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [13, 15, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [15, 17, 18, 26]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [18, 19, 24]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [16, 20, 22]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [15, 17]}\n    ],\n    \"complexes\": [\"KRAB-KAP1-HP1 complex\"],\n    \"partners\": [\"SF1\", \"CTNNB1\", \"AR\", \"EP300\", \"HDAC3\", \"SP1\", \"WDR5\", \"KRAB-O\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}