{"gene":"FSHR","run_date":"2026-04-28T17:46:04","timeline":{"discoveries":[{"year":2004,"finding":"FSHR interacts with the adapter protein 14-3-3tau via its first and second intracellular loops; this interaction is FSH-dependent and over-expression of 14-3-3tau modestly decreases FSH-induced cAMP accumulation, implicating 14-3-3tau in regulation of FSHR signaling.","method":"Yeast two-hybrid screen (iL1-iL2 bait vs. human ovarian cDNA library), co-immunoprecipitation in HEK293 cells stably expressing FSHR, functional cAMP assay with 14-3-3tau over-expression","journal":"Molecular and cellular endocrinology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus functional cAMP readout, single lab with multiple orthogonal methods","pmids":["15196694"],"is_preprint":false},{"year":2006,"finding":"FSHR interacts with APPL1, APPL2, Akt2, and FOXO1a, organizing them into distinct scaffolding networks; APPL1 and APPL2 associate with each other via the N-terminal BAR domain of APPL1, but APPL2 does not bind Akt2 (first documented functional difference between APPL1 and APPL2), and FOXO1a does not associate with either APPL protein.","method":"Co-immunoprecipitation in HEK293 cells, interaction mapping with domain deletion constructs","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple reciprocal Co-IPs with domain mapping, single lab","pmids":["17030088"],"is_preprint":false},{"year":1998,"finding":"FSHR promoter activity in Sertoli cells requires multiple elements including a critical E-box (CACGTG); USF1 and USF2 are the primary proteins binding this E-box, and mutation of core or flanking E-box sequences abolishes promoter function. A second E-box-binding complex cross-reactive with USF antibodies is present only in primary Sertoli cells.","method":"Transient transfection of deletion/block-replacement mutants in Sertoli cell line (MSC-1) and primary Sertoli cells; EMSA with USF antibodies","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis + EMSA with antibody supershift, replicated in cell line and primary cells","pmids":["9773974"],"is_preprint":false},{"year":2005,"finding":"Fshr transcription is silenced by a DNase I hypersensitive site (DHS3) in the first intron; OCT-1 binds site 7 within DHS3 in non-expressing myoid cells to repress transcription, while GATA-1 binds the same site predominantly in Sertoli cells and attenuates silencing. ChIP confirmed OCT-1 occupancy at the endogenous locus.","method":"DNase I hypersensitivity mapping, transient transfection of DHS3 constructs, EMSA, chromatin immunoprecipitation (ChIP)","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 1 — ChIP at endogenous locus + in vitro binding + functional transfection with mutagenesis","pmids":["15817654"],"is_preprint":false},{"year":2006,"finding":"Distal regulatory elements outside a 413 kb YAC transgene are required for correct spatiotemporal Fshr expression in vivo; evolutionarily conserved regions (ECR4, ECR5) outside this region showed differential transcriptional activity in expressing vs. non-expressing cells.","method":"YAC transgenic mice (RT-PCR for transgene expression), comparative genomics, transient transfection of ECRs","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo transgenic approach plus functional transfection, single lab","pmids":["17097219"],"is_preprint":false},{"year":2006,"finding":"FSHR mRNA in bovine granulosa cells is specifically upregulated by androgens (testosterone and DHT) through the androgen receptor, not by estradiol; this was shown by bicalutamide blocking T/DHT effects on FSHR but not CYP19A1, while ICI 182,780 blocked estrogen effects on CYP19A1 but not FSHR.","method":"Primary bovine granulosa cell culture, steroid dose-response and duration experiments, selective receptor antagonists (bicalutamide, ICI 182,780), quantitative mRNA measurement","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 — pharmacological dissection with selective antagonists, multiple treatment conditions, single lab","pmids":["16641147"],"is_preprint":false},{"year":2010,"finding":"Intra-ovarian injection of adenovirus expressing human FSHR into FORKO (Fshr knockout) mice restored FSH responsiveness, reinitiated folliculogenesis beyond the primary stage, increased estrogen 2–3-fold, and decreased FSH by 50%, demonstrating that FSHR expression in granulosa cells is required and sufficient for folliculogenesis progression.","method":"In vivo adenoviral gene delivery into Fshr-/- mice, histological evaluation of follicle stages, serum hormone ELISA, vaginal cytology","journal":"Molecular human reproduction","confidence":"High","confidence_rationale":"Tier 2 — clean KO rescue with defined cellular/hormonal phenotype, multiple outcome measures","pmids":["20086006"],"is_preprint":false},{"year":2014,"finding":"Alternative skipping of FSHR exon 2 or exon 3 produces receptor variants that fail to initiate cAMP signaling upon FSH stimulation despite high ligand doses, and these splice variants are exclusive to low ovarian responders undergoing IVF.","method":"RT-PCR of cumulus cells from IVF patients, identification of splice variants, transfection of full-length and variant constructs into HEK293 cells with cAMP assay","journal":"Molecular human reproduction","confidence":"High","confidence_rationale":"Tier 1 — in vitro functional reconstitution of splice variants with cAMP readout + clinical genotype-phenotype correlation","pmids":["24670307"],"is_preprint":false},{"year":2017,"finding":"A novel homozygous nonsense mutation in FSHR (p.R59X, exon 2) causes primary ovarian insufficiency by abolishing full-length receptor protein expression and eliminating FSH-induced cAMP signaling, arresting folliculogenesis.","method":"Sanger sequencing, Western blotting for FSHR protein, cAMP assay in cells transfected with wild-type vs. mutant FSHR, ovarian histology","journal":"Fertility and sterility","confidence":"High","confidence_rationale":"Tier 1 — loss-of-function mutation with reconstituted cAMP assay and protein expression analysis","pmids":["29157895"],"is_preprint":false},{"year":2017,"finding":"A novel FSHR cytoplasmic tail mutation (R634H, c.1901G>A) does not confer constitutive activity but reduces cell surface expression of the receptor and decreases FSH-stimulated cAMP production.","method":"Sanger sequencing, functional cAMP assay, cell surface expression analysis","journal":"BMC medical genetics","confidence":"Medium","confidence_rationale":"Tier 2 — functional assay of mutant receptor with surface expression, single case study","pmids":["28446136"],"is_preprint":false},{"year":2019,"finding":"BMP15 induces FSHR expression in human granulosa cells through both Smad1/5/8 (canonical) and non-Smad (p38 MAPK → USF1 phosphorylation) pathways, leading to increased histone acetyltransferase activity, histone modifications at the FSHR promoter, and enhanced USF1/2 binding, which ultimately increases CYP19A1 expression and estradiol production.","method":"Immortalized human granulosa (HGrC1) cells stimulated with BMP15 ± inhibitors (LDN193189, SB203580); Western blot for Smad and MAPK phosphorylation; HAT activity assay; ChIP for histone modifications and USF1/2 binding; FSHR and CYP19A1 mRNA/protein measurement; estradiol ELISA","journal":"Journal of assisted reproduction and genetics","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods (ChIP, kinase inhibitors, HAT assay, pathway-specific inhibitors) in a single study","pmids":["31079267"],"is_preprint":false},{"year":2019,"finding":"Tyrosine nitration of FSHR by peroxynitrite sequesters the receptor in the cytoplasm and promotes its proteasomal degradation; Y626 was identified as the critical nitrated residue required for intracellular trafficking to the cell surface, and peroxynitrite-mediated FSHR mislocalization impairs FSH-induced Akt-FoxO3a survival signaling in granulosa cells.","method":"Site-directed mutagenesis of four nitrated tyrosine residues (Y626A and others), immunofluorescence for FSHR localization, peroxynitrite treatment of KGN cells, Akt/FoxO3a phosphorylation by Western blot, apoptosis assay","journal":"Aging","confidence":"High","confidence_rationale":"Tier 1 — site-directed mutagenesis identifying specific residue + localization imaging + signaling assay","pmids":["31097679"],"is_preprint":false},{"year":2021,"finding":"Differential FSH glycosylation modulates FSHR oligomerization and downstream cAMP production: hypo-glycosylated FSH21/18 and high-dose eFSH rapidly dissociate FSHR oligomers into monomers (correlating with higher cAMP), while fully glycosylated FSH24 shows slower kinetics; a β-arrestin-biased agonist (truncated eLHβ + dg-eLHα) promotes FSHR homomerization.","method":"Super-resolution imaging (PD-PALM) of FSHR complexes in HEK293 cells; comparison of FSH glycoforms (FSH21/18 vs. FSH24) at multiple concentrations and time points; cAMP ELISA","journal":"Frontiers in endocrinology","confidence":"High","confidence_rationale":"Tier 1 — super-resolution structural approach combined with functional cAMP assay using defined glycoform ligands","pmids":["34925235"],"is_preprint":false},{"year":2016,"finding":"FSHR negative allosteric modulators ADX68692 and ADX68693 display biased antagonism at both FSHR and the closely related LH/CGR: ADX68693 more potently inhibits hCG-induced cAMP and β-arrestin 2 recruitment, and differentially suppresses progesterone and testosterone production in Leydig cells, demonstrating that cAMP and β-arrestin pathways contribute differently to FSHR- vs. LH/CGR-mediated steroidogenesis.","method":"cAMP assay in HEK293 cells and mLTC-1/rat primary Leydig cells; β-arrestin 2 recruitment assay; progesterone and testosterone ELISA; pharmacological profiling with two NAMs","journal":"Molecular and cellular endocrinology","confidence":"High","confidence_rationale":"Tier 2 — multiple cell types, multiple signaling endpoints, two compounds with differential pharmacological profiles","pmids":["27424143"],"is_preprint":false},{"year":2016,"finding":"Granulosa cells from women homozygous for the FSHR N680S (AA) variant show lower intracellular cAMP responses to Follitropin alpha stimulation compared to women with other genotypes, providing a direct functional cellular correlate of this polymorphism.","method":"Granulosa cells isolated by flow cytometry from IVF patients, stimulated with FSH; cAMP and IP3 measured by ELISA; genotype-stratified comparison","journal":"Human reproduction","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional assay in primary human cells, single lab","pmids":["26769719"],"is_preprint":false},{"year":2018,"finding":"Deletion of fetoplacental FSHR (Fshr null fetuses in Fshr wild-type dams) significantly reduces the proportion of placenta composed of labyrinth and decreases fetal vessel angiogenesis within the labyrinth, demonstrating that FSHR signaling in fetal vascular endothelium is required for placental angiogenesis.","method":"Fshr null mice with genotype-controlled pregnancies, quantitative morphometric analysis of placental labyrinths at mid-gestation","journal":"Molecular and cellular endocrinology","confidence":"High","confidence_rationale":"Tier 2 — clean in vivo KO with defined morphometric phenotype and controlled genetic background","pmids":["29715497"],"is_preprint":false},{"year":2020,"finding":"FSHR ablation in mice (Fshr-/- with ovariectomy) induces depression-like behaviors associated with severe oxidative stress in the brain due to reduced GCLm (glutathione synthesis) and G6PD (NADPH pathway); administration of NAC rescued the phenotype. FSH dose-dependently increased GCLm and G6PD and decreased ROS in neurons, indicating FSHR signaling maintains neuronal redox balance.","method":"Fshr-/- ovariectomized mice, behavioral tests, ROS measurement, Western blot for GCLm/G6PD; N2a neuroblastoma cells treated with FSH; NAC rescue","journal":"Acta pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 — KO + in vitro rescue in neuronal cells, multiple endpoints, single lab","pmids":["32203083"],"is_preprint":false},{"year":2023,"finding":"FSHR activates mTOR-HIF1α signaling in granulosa cells to promote follicle survival; HIF1 activation is essential for follicle growth downstream of FSH, while AMPK activation (energy shortage) drives atresia, and the FSHR-mTOR-HIF1 axis allows follicles to escape AMPK-induced atresia.","method":"Single-cell transcriptomic atlas of mouse granulosa cells, functional validation in granulosa cell models with pathway inhibitors and activators, HIF1 loss-of-function","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptomic pathway discovery with functional epistasis validation, single lab","pmids":["37733588"],"is_preprint":false},{"year":2019,"finding":"TRIB3 upregulated by high free fatty acids reduces FSHR expression in human granulosa cells through the Akt/GSK3β pathway; TRIB3 knockdown reversed FFA-induced FSHR downregulation and restored estradiol production, and Akt inhibition in TRIB3-knockdown cells increased p-GSK3β but elevated FSHR expression, revealing TRIB3→Akt→GSK3β as a regulatory axis controlling FSHR.","method":"Primary human granulosa cells and KGN cells, palmitic acid treatment, TRIB3 siRNA knockdown, Western blot for p-Akt/p-GSK3β/TRIB3/FSHR, estradiol ELISA, p-Akt inhibitor treatment","journal":"Reproductive biology and endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — RNAi knockdown with pathway inhibitor rescue, multiple molecular endpoints, single lab","pmids":["34503515"],"is_preprint":false},{"year":2023,"finding":"Paeoniflorin restores estradiol synthesis in ovarian granulosa cells via activation of the FSHR/cAMP/PKA/CREB signaling pathway; siRNA knockdown of FSHR and an FSHR antagonist both abolished paeoniflorin's effects, placing FSHR upstream of cAMP/PKA/CREB and aromatase induction.","method":"Cisplatin-induced DOR mouse model, KGN cells with siRNA-FSHR knockdown and FSHR antagonist, cAMP/PKA/CREB Western blot, estradiol and aromatase measurement","journal":"Molecules","confidence":"Medium","confidence_rationale":"Tier 2 — genetic (siRNA) and pharmacological (antagonist) loss-of-function with defined signaling endpoints, single lab","pmids":["38138611"],"is_preprint":false},{"year":2013,"finding":"SMAD3 overexpression in rat granulosa cells promotes estrogen production and proliferation while inhibiting apoptosis, and these effects are associated with increased FSHR and PKA expression, placing SMAD3 upstream of FSHR-mediated cAMP/PKA signaling in granulosa cell function.","method":"Primary rat granulosa cells with Smad3 overexpression and RNAi knockdown, Western blot for FSHR/PKA/cyclin D2/PCNA, estrogen ELISA, flow cytometry for cell cycle and apoptosis","journal":"Reproduction","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional manipulation (OE + KD) with multiple molecular endpoints, single lab","pmids":["23690627"],"is_preprint":false},{"year":2016,"finding":"TGF-β/SMAD4 signaling prevents granulosa cell apoptosis and follicular atresia in part by suppressing miR-143, which directly targets FSHR; miR-143 overexpression reduces FSHR levels and downstream PKA and AKT/p-AKT signaling, while activated TGF-β signaling rescues miR-143-induced FSHR downregulation and apoptosis.","method":"pGC knockdown of FSHR, miR-143 overexpression/inhibition, SMAD4 chromatin binding assay (luciferase/ChIP for miR-143 promoter), Western blot for PKA/AKT/p-AKT, apoptosis assay; in vivo follicular atresia model in pigs","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KD, miRNA OE, promoter binding, in vivo), replicated in vitro and in vivo","pmids":["27882941"],"is_preprint":false}],"current_model":"FSHR is a G protein-coupled receptor expressed on granulosa and Sertoli cells whose promoter is activated by USF1/2 via an E-box and repressed by OCT-1/GATA factors from an intronic silencer element; upon FSH binding, it couples primarily to Gαs/cAMP/PKA/CREB signaling and also engages β-arrestin, PI3K/AKT, and HIF1α pathways, with receptor function modulated by a scaffolding network of interacting proteins (14-3-3tau, APPL1, APPL2, Akt2, FOXO1a), by oligomerization state influenced by FSH glycoforms, by upstream regulators including androgens (via androgen receptor), BMP15 (via Smad/p38/USF1), TGF-β/SMAD4/miR-143, and TRIB3/Akt/GSK3β, and by post-translational nitration of Y626 which impairs trafficking to the cell surface; FSHR is required in vivo for folliculogenesis beyond the primary stage and for fetal placental angiogenesis."},"narrative":{"teleology":[{"year":1998,"claim":"Identifying the cis-regulatory logic of FSHR transcription established that USF1/2 binding to a promoter E-box is essential for FSHR expression in Sertoli cells, answering how cell-type-specific transcription is initiated.","evidence":"Deletion/block-replacement mutagenesis and EMSA with USF antibody supershift in MSC-1 line and primary Sertoli cells","pmids":["9773974"],"confidence":"High","gaps":["USF1/2 requirement not tested in granulosa cells at this point","Chromatin context (histone modifications) not addressed","Distal enhancer contributions unknown"]},{"year":2004,"claim":"Discovery of 14-3-3τ as an FSH-dependent interactor of FSHR intracellular loops revealed that scaffolding proteins modulate receptor signaling output, providing the first non-G-protein binding partner of FSHR.","evidence":"Yeast two-hybrid, co-immunoprecipitation in FSHR-expressing HEK293 cells, and cAMP functional assay","pmids":["15196694"],"confidence":"High","gaps":["Physiological relevance in granulosa/Sertoli cells not tested","Mechanism by which 14-3-3τ attenuates cAMP unclear","Whether other 14-3-3 isoforms contribute is unknown"]},{"year":2005,"claim":"Identification of an intronic silencer element (DHS3) bound by OCT-1 in non-expressing cells explained how FSHR transcription is repressed outside the gonad, with GATA-1 counteracting this silencing in Sertoli cells.","evidence":"DNase I hypersensitivity mapping, ChIP at endogenous locus, EMSA, and functional transfection with mutagenesis","pmids":["15817654"],"confidence":"High","gaps":["Whether OCT-1/GATA balance shifts during development not addressed","Role of DHS3 in granulosa cells unknown"]},{"year":2006,"claim":"Multiple discoveries in 2006 expanded the regulatory landscape: androgens acting through the androgen receptor upregulate FSHR mRNA in granulosa cells, APPL1/2 and FOXO1a form distinct scaffolding networks on the receptor, and distal conserved elements beyond a 413 kb transgene are needed for correct in vivo expression.","evidence":"Primary bovine granulosa cells with selective antagonists (bicalutamide/ICI); co-IP domain mapping in HEK293; YAC transgenic mice with comparative genomics","pmids":["16641147","17030088","17097219"],"confidence":"High","gaps":["Androgen receptor binding site on FSHR promoter not identified","APPL1/2 functional contribution to FSH signaling not tested","Distal regulatory elements not validated by targeted deletion in vivo"]},{"year":2010,"claim":"Adenoviral FSHR rescue in Fshr-knockout mice proved that FSHR expression in granulosa cells is both required and sufficient for progression of folliculogenesis beyond the primary stage, establishing the receptor's indispensable in vivo role.","evidence":"In vivo adenoviral gene delivery into Fshr−/− mouse ovaries with histological and hormonal phenotyping","pmids":["20086006"],"confidence":"High","gaps":["Rescue was transient; long-term fertility not assessed","Whether FSHR in theca or other ovarian cells contributes remains untested"]},{"year":2013,"claim":"SMAD3 was placed upstream of FSHR transcription in granulosa cells, linking TGF-β superfamily signaling to receptor abundance and downstream PKA activity.","evidence":"SMAD3 overexpression and RNAi in primary rat granulosa cells with Western blot for FSHR/PKA and estrogen measurement","pmids":["23690627"],"confidence":"Medium","gaps":["Direct SMAD3 binding to FSHR promoter not demonstrated","Contribution relative to BMP/Smad1/5/8 pathway unclear"]},{"year":2014,"claim":"Discovery of exon 2/3-skipped FSHR splice variants that abolish cAMP signaling linked receptor isoform diversity to poor ovarian response in IVF patients, connecting alternative splicing to clinical phenotype.","evidence":"RT-PCR from cumulus cells of IVF patients; reconstitution of splice variants in HEK293 cells with cAMP assay","pmids":["24670307"],"confidence":"High","gaps":["Mechanism driving exon skipping unknown","Prevalence in general population not determined","Dominant-negative effects on wild-type receptor not tested"]},{"year":2016,"claim":"Convergent 2016 studies demonstrated biased signaling pharmacology and upstream miRNA-mediated regulation: negative allosteric modulators showed differential antagonism of cAMP vs. β-arrestin pathways, TGF-β/SMAD4 was shown to maintain FSHR levels by suppressing miR-143, and the N680S polymorphism was directly linked to reduced cAMP output in patient granulosa cells.","evidence":"NAM profiling in HEK293 and Leydig cells; miR-143 OE/inhibition with SMAD4 ChIP in porcine granulosa cells; cAMP measurement in genotype-stratified human granulosa cells from IVF","pmids":["27424143","27882941","26769719"],"confidence":"High","gaps":["Biased agonism in vivo untested","miR-143 regulation of FSHR not confirmed in human cells","N680S structural basis for reduced signaling unknown"]},{"year":2017,"claim":"Loss-of-function mutations (p.R59X nonsense and R634H cytoplasmic tail) established that both receptor protein expression and proper surface trafficking are essential for FSH-induced cAMP production, with p.R59X causing primary ovarian insufficiency.","evidence":"Sanger sequencing, Western blot, and cAMP assay in transfected cells for both mutations; ovarian histology for R59X","pmids":["29157895","28446136"],"confidence":"High","gaps":["R634H associated clinical phenotype from single case only","Whether R634H affects β-arrestin or other non-cAMP pathways untested"]},{"year":2018,"claim":"Fetal FSHR was shown to be required for placental labyrinth angiogenesis, extending FSHR function beyond the gonad to vascular biology during development.","evidence":"Fshr null fetuses in wild-type dams with quantitative morphometric analysis of placental labyrinths","pmids":["29715497"],"confidence":"High","gaps":["Downstream angiogenic signaling pathway not identified","Whether endothelial FSHR directly activates VEGF or other angiogenic factors unknown"]},{"year":2019,"claim":"Three 2019 studies resolved distinct post-transcriptional and post-translational control mechanisms: BMP15 induces FSHR via Smad/p38-USF1 chromatin remodeling, peroxynitrite-mediated Y626 nitration sequesters FSHR intracellularly, and TRIB3/Akt/GSK3β links metabolic stress to FSHR downregulation.","evidence":"ChIP for histone marks and USF1/2 at FSHR promoter in HGrC1 cells; Y626A mutagenesis with immunofluorescence and Akt/FoxO3a signaling in KGN cells; TRIB3 siRNA with Akt inhibitor rescue in primary human granulosa cells","pmids":["31079267","31097679","34503515"],"confidence":"High","gaps":["In vivo relevance of Y626 nitration not established","BMP15-USF1 axis not validated in primary human follicles","TRIB3 mechanism at FSHR promoter (direct vs. indirect) unclear"]},{"year":2021,"claim":"Super-resolution imaging revealed that FSH glycoform composition controls FSHR oligomerization dynamics — hypo-glycosylated FSH dissociates oligomers into monomers correlating with higher cAMP, while β-arrestin-biased ligands promote homomerization — providing a structural basis for ligand-biased signaling.","evidence":"PD-PALM super-resolution imaging of FSHR in HEK293 cells with defined FSH glycoforms and cAMP ELISA","pmids":["34925235"],"confidence":"High","gaps":["Oligomerization dynamics not assessed in primary granulosa/Sertoli cells","Structural interface mediating oligomer-monomer transition undefined","Physiological ratio of FSH glycoforms in follicular fluid not linked to receptor state"]},{"year":2023,"claim":"FSHR was placed at the apex of an mTOR-HIF1α survival axis in granulosa cells, explaining how FSH signaling enables follicles to escape AMPK-driven atresia and linking receptor activation to metabolic control of follicle fate.","evidence":"Single-cell transcriptomics of mouse granulosa cells with functional validation using pathway inhibitors and HIF1 loss-of-function","pmids":["37733588"],"confidence":"Medium","gaps":["HIF1α target genes mediating survival not fully identified","Whether this axis operates in human follicles untested","Interaction with BMP15/TRIB3 regulatory inputs not examined"]},{"year":null,"claim":"Major open questions include the structural basis of FSHR oligomerization and its transition upon ligand binding, the in vivo significance of post-translational modifications such as Y626 nitration, the identity of downstream angiogenic effectors of placental FSHR, and how the multiple transcriptional inputs (USF, SMAD, androgen receptor, miR-143) are integrated in a follicle-stage-specific manner.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of full-length FSHR in active oligomeric state","No in vivo confirmation that Y626 nitration regulates fertility","Placental FSHR downstream signaling cascade undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,7,8,12,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[12,13]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[9,11,12]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,12,13,17,19]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,15]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[6,7,8]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,3,10,21]}],"complexes":[],"partners":["YWHAQ","APPL1","APPL2","AKT2","FOXO1","ARRB2","USF1","USF2"],"other_free_text":[]},"mechanistic_narrative":"FSHR is a G protein-coupled receptor that transduces follicle-stimulating hormone signaling primarily through the Gαs/cAMP/PKA/CREB cascade, with additional engagement of β-arrestin, PI3K/AKT, and mTOR-HIF1α pathways, to drive folliculogenesis, granulosa cell survival, estradiol biosynthesis, and fetal placental angiogenesis [PMID:20086006, PMID:29715497, PMID:37733588, PMID:34925235]. FSHR transcription in Sertoli and granulosa cells depends on USF1/2 binding to a promoter E-box and is modulated by an intronic silencer occupied by OCT-1, by upstream signals including androgens, BMP15 (via Smad/p38/USF1), TGF-β/SMAD4-mediated suppression of miR-143, and metabolic regulators such as TRIB3/Akt/GSK3β [PMID:9773974, PMID:15817654, PMID:16641147, PMID:31079267, PMID:27882941, PMID:34503515]. Receptor function is further regulated by ligand glycoform-dependent oligomerization dynamics, scaffolding interactions with 14-3-3τ, APPL1/2, and FOXO1a, and by post-translational tyrosine nitration at Y626 that impairs surface trafficking and downstream Akt-FoxO3a survival signaling [PMID:34925235, PMID:15196694, PMID:17030088, PMID:31097679]. Loss-of-function mutations in FSHR, including the p.R59X nonsense variant, cause primary ovarian insufficiency by abolishing cAMP signaling and arresting folliculogenesis [PMID:29157895]."},"prefetch_data":{"uniprot":{"accession":"P23945","full_name":"Follicle-stimulating hormone receptor","aliases":["Follitropin receptor"],"length_aa":695,"mass_kda":78.2,"function":"G protein-coupled receptor for follitropin, the follicle-stimulating hormone (PubMed:11847099, PubMed:24058690, PubMed:24692546). Through cAMP production activates the downstream PI3K-AKT and ERK1/ERK2 signaling pathways (PubMed:24058690)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P23945/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FSHR","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FSHR","total_profiled":1310},"omim":[{"mim_id":"620006","title":"RAD54-LIKE 2; RAD54L2","url":"https://www.omim.org/entry/620006"},{"mim_id":"612842","title":"RASD FAMILY, MEMBER 2; RASD2","url":"https://www.omim.org/entry/612842"},{"mim_id":"611926","title":"IMMUNODEFICIENCY, OVARIAN DYSGENESIS, AND PULMONARY 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endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/23036736","citation_count":15,"is_preprint":false},{"pmid":"32203083","id":"PMC_32203083","title":"FSHR ablation induces depression-like behaviors.","date":"2020","source":"Acta pharmacologica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/32203083","citation_count":15,"is_preprint":false},{"pmid":"33969141","id":"PMC_33969141","title":"Investigation of the FSHR, CYP11, and INSR Mutations and Polymorphisms in Iranian Infertile Women with Polycystic Ovary Syndrome (PCOS).","date":"2021","source":"Reports of biochemistry & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/33969141","citation_count":14,"is_preprint":false},{"pmid":"22985084","id":"PMC_22985084","title":"Gender-specific association between FSHR and PPARG common variants and human longevity.","date":"2013","source":"Rejuvenation research","url":"https://pubmed.ncbi.nlm.nih.gov/22985084","citation_count":14,"is_preprint":false},{"pmid":"21521644","id":"PMC_21521644","title":"Up-regulation of FSHR expression during gonadal sex determination in the frog Rana rugosa.","date":"2011","source":"General and comparative endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/21521644","citation_count":14,"is_preprint":false},{"pmid":"34217202","id":"PMC_34217202","title":"A major QTL at the LHCGR/FSHR locus for multiple birth in Holstein cattle.","date":"2021","source":"Genetics, selection, evolution : GSE","url":"https://pubmed.ncbi.nlm.nih.gov/34217202","citation_count":14,"is_preprint":false},{"pmid":"31521670","id":"PMC_31521670","title":"Association of FSHR missense mutations with female infertility, in silico investigation of their molecular significance and exploration of possible treatments using virtual screening and molecular dynamics.","date":"2019","source":"Analytical biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/31521670","citation_count":14,"is_preprint":false},{"pmid":"24205076","id":"PMC_24205076","title":"Fine-mapping an association of FSHR with preterm birth in a Finnish population.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24205076","citation_count":14,"is_preprint":false},{"pmid":"29683332","id":"PMC_29683332","title":"The Impact of FSHR Gene Polymorphisms Ala307Thr and Asn680Ser in the Endometriosis Development.","date":"2018","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/29683332","citation_count":13,"is_preprint":false},{"pmid":"25241129","id":"PMC_25241129","title":"Genotyping common FSHR polymorphisms based on competitive amplification of differentially melting amplicons (CADMA).","date":"2014","source":"Journal of assisted reproduction and genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25241129","citation_count":13,"is_preprint":false},{"pmid":"17097219","id":"PMC_17097219","title":"Distal regulatory elements are required for Fshr expression, in vivo.","date":"2006","source":"Molecular and cellular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/17097219","citation_count":13,"is_preprint":false},{"pmid":"30988730","id":"PMC_30988730","title":"Tanshinone IIA attenuates estradiol-induced polycystic ovarian syndrome in mice by ameliorating FSHR expression in the ovary.","date":"2019","source":"Experimental and therapeutic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30988730","citation_count":13,"is_preprint":false},{"pmid":"21557921","id":"PMC_21557921","title":"Follicle-stimulating hormone receptor (FSHR)-derived peptide vaccine induced infertility in mice without pathological effect on reproductive organs.","date":"2011","source":"Reproduction, fertility, and development","url":"https://pubmed.ncbi.nlm.nih.gov/21557921","citation_count":13,"is_preprint":false},{"pmid":"28626448","id":"PMC_28626448","title":"The Common Follicle-Stimulating Hormone Receptor (FSHR) Promoter Polymorphism FSHR -29G > A Affects Androgen Production in Normal Human Small Antral Follicles.","date":"2017","source":"Frontiers in endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/28626448","citation_count":12,"is_preprint":false},{"pmid":"29133260","id":"PMC_29133260","title":"Expression of FSHR in chondrocytes and the effect of FSH on chondrocytes.","date":"2017","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/29133260","citation_count":12,"is_preprint":false},{"pmid":"19906003","id":"PMC_19906003","title":"A novel dominant B-cell epitope of FSHR identified by molecular docking induced specific immune response and suppressed fertility.","date":"2009","source":"Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/19906003","citation_count":12,"is_preprint":false},{"pmid":"38138611","id":"PMC_38138611","title":"Paeoniflorin Alleviates Cisplatin-Induced Diminished Ovarian Reserve by Restoring the Function of Ovarian Granulosa Cells via Activating FSHR/cAMP/PKA/CREB Signaling Pathway.","date":"2023","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/38138611","citation_count":12,"is_preprint":false},{"pmid":"24002953","id":"PMC_24002953","title":"Immunohistochemical detection of follicle stimulating hormone receptor (FSHR) in neuroendocrine tumours.","date":"2013","source":"Endokrynologia Polska","url":"https://pubmed.ncbi.nlm.nih.gov/24002953","citation_count":11,"is_preprint":false},{"pmid":"34503515","id":"PMC_34503515","title":"TRIB3 regulates FSHR expression in human granulosa cells under high levels of free fatty acids.","date":"2021","source":"Reproductive biology and endocrinology : RB&E","url":"https://pubmed.ncbi.nlm.nih.gov/34503515","citation_count":11,"is_preprint":false},{"pmid":"29715497","id":"PMC_29715497","title":"Deletion of fetoplacental Fshr inhibits fetal vessel angiogenesis in the mouse placenta.","date":"2018","source":"Molecular and cellular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/29715497","citation_count":11,"is_preprint":false},{"pmid":"25935136","id":"PMC_25935136","title":"LH (Trp8Arg/Ile15Thr), LHR (insLQ) and FSHR (Asn680Ser) polymorphisms genotypic prevalence in women with endometriosis and infertility.","date":"2015","source":"Journal of assisted reproduction and genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25935136","citation_count":11,"is_preprint":false},{"pmid":"33739800","id":"PMC_33739800","title":"Association of FSHR, LH, LHR, BMP15, GDF9, AMH, and AMHR polymorphisms with poor ovarian response in patients undergoing in vitro fertilization.","date":"2021","source":"JBRA assisted reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/33739800","citation_count":11,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":55927,"output_tokens":5620,"usd":0.12604},"stage2":{"model":"claude-opus-4-6","input_tokens":9235,"output_tokens":3659,"usd":0.206475},"total_usd":0.332515,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"FSHR interacts with the adapter protein 14-3-3tau via its first and second intracellular loops; this interaction is FSH-dependent and over-expression of 14-3-3tau modestly decreases FSH-induced cAMP accumulation, implicating 14-3-3tau in regulation of FSHR signaling.\",\n      \"method\": \"Yeast two-hybrid screen (iL1-iL2 bait vs. human ovarian cDNA library), co-immunoprecipitation in HEK293 cells stably expressing FSHR, functional cAMP assay with 14-3-3tau over-expression\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional cAMP readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"15196694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FSHR interacts with APPL1, APPL2, Akt2, and FOXO1a, organizing them into distinct scaffolding networks; APPL1 and APPL2 associate with each other via the N-terminal BAR domain of APPL1, but APPL2 does not bind Akt2 (first documented functional difference between APPL1 and APPL2), and FOXO1a does not associate with either APPL protein.\",\n      \"method\": \"Co-immunoprecipitation in HEK293 cells, interaction mapping with domain deletion constructs\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple reciprocal Co-IPs with domain mapping, single lab\",\n      \"pmids\": [\"17030088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"FSHR promoter activity in Sertoli cells requires multiple elements including a critical E-box (CACGTG); USF1 and USF2 are the primary proteins binding this E-box, and mutation of core or flanking E-box sequences abolishes promoter function. A second E-box-binding complex cross-reactive with USF antibodies is present only in primary Sertoli cells.\",\n      \"method\": \"Transient transfection of deletion/block-replacement mutants in Sertoli cell line (MSC-1) and primary Sertoli cells; EMSA with USF antibodies\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis + EMSA with antibody supershift, replicated in cell line and primary cells\",\n      \"pmids\": [\"9773974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Fshr transcription is silenced by a DNase I hypersensitive site (DHS3) in the first intron; OCT-1 binds site 7 within DHS3 in non-expressing myoid cells to repress transcription, while GATA-1 binds the same site predominantly in Sertoli cells and attenuates silencing. ChIP confirmed OCT-1 occupancy at the endogenous locus.\",\n      \"method\": \"DNase I hypersensitivity mapping, transient transfection of DHS3 constructs, EMSA, chromatin immunoprecipitation (ChIP)\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP at endogenous locus + in vitro binding + functional transfection with mutagenesis\",\n      \"pmids\": [\"15817654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Distal regulatory elements outside a 413 kb YAC transgene are required for correct spatiotemporal Fshr expression in vivo; evolutionarily conserved regions (ECR4, ECR5) outside this region showed differential transcriptional activity in expressing vs. non-expressing cells.\",\n      \"method\": \"YAC transgenic mice (RT-PCR for transgene expression), comparative genomics, transient transfection of ECRs\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic approach plus functional transfection, single lab\",\n      \"pmids\": [\"17097219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FSHR mRNA in bovine granulosa cells is specifically upregulated by androgens (testosterone and DHT) through the androgen receptor, not by estradiol; this was shown by bicalutamide blocking T/DHT effects on FSHR but not CYP19A1, while ICI 182,780 blocked estrogen effects on CYP19A1 but not FSHR.\",\n      \"method\": \"Primary bovine granulosa cell culture, steroid dose-response and duration experiments, selective receptor antagonists (bicalutamide, ICI 182,780), quantitative mRNA measurement\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological dissection with selective antagonists, multiple treatment conditions, single lab\",\n      \"pmids\": [\"16641147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Intra-ovarian injection of adenovirus expressing human FSHR into FORKO (Fshr knockout) mice restored FSH responsiveness, reinitiated folliculogenesis beyond the primary stage, increased estrogen 2–3-fold, and decreased FSH by 50%, demonstrating that FSHR expression in granulosa cells is required and sufficient for folliculogenesis progression.\",\n      \"method\": \"In vivo adenoviral gene delivery into Fshr-/- mice, histological evaluation of follicle stages, serum hormone ELISA, vaginal cytology\",\n      \"journal\": \"Molecular human reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO rescue with defined cellular/hormonal phenotype, multiple outcome measures\",\n      \"pmids\": [\"20086006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Alternative skipping of FSHR exon 2 or exon 3 produces receptor variants that fail to initiate cAMP signaling upon FSH stimulation despite high ligand doses, and these splice variants are exclusive to low ovarian responders undergoing IVF.\",\n      \"method\": \"RT-PCR of cumulus cells from IVF patients, identification of splice variants, transfection of full-length and variant constructs into HEK293 cells with cAMP assay\",\n      \"journal\": \"Molecular human reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro functional reconstitution of splice variants with cAMP readout + clinical genotype-phenotype correlation\",\n      \"pmids\": [\"24670307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A novel homozygous nonsense mutation in FSHR (p.R59X, exon 2) causes primary ovarian insufficiency by abolishing full-length receptor protein expression and eliminating FSH-induced cAMP signaling, arresting folliculogenesis.\",\n      \"method\": \"Sanger sequencing, Western blotting for FSHR protein, cAMP assay in cells transfected with wild-type vs. mutant FSHR, ovarian histology\",\n      \"journal\": \"Fertility and sterility\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — loss-of-function mutation with reconstituted cAMP assay and protein expression analysis\",\n      \"pmids\": [\"29157895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A novel FSHR cytoplasmic tail mutation (R634H, c.1901G>A) does not confer constitutive activity but reduces cell surface expression of the receptor and decreases FSH-stimulated cAMP production.\",\n      \"method\": \"Sanger sequencing, functional cAMP assay, cell surface expression analysis\",\n      \"journal\": \"BMC medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional assay of mutant receptor with surface expression, single case study\",\n      \"pmids\": [\"28446136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BMP15 induces FSHR expression in human granulosa cells through both Smad1/5/8 (canonical) and non-Smad (p38 MAPK → USF1 phosphorylation) pathways, leading to increased histone acetyltransferase activity, histone modifications at the FSHR promoter, and enhanced USF1/2 binding, which ultimately increases CYP19A1 expression and estradiol production.\",\n      \"method\": \"Immortalized human granulosa (HGrC1) cells stimulated with BMP15 ± inhibitors (LDN193189, SB203580); Western blot for Smad and MAPK phosphorylation; HAT activity assay; ChIP for histone modifications and USF1/2 binding; FSHR and CYP19A1 mRNA/protein measurement; estradiol ELISA\",\n      \"journal\": \"Journal of assisted reproduction and genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods (ChIP, kinase inhibitors, HAT assay, pathway-specific inhibitors) in a single study\",\n      \"pmids\": [\"31079267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Tyrosine nitration of FSHR by peroxynitrite sequesters the receptor in the cytoplasm and promotes its proteasomal degradation; Y626 was identified as the critical nitrated residue required for intracellular trafficking to the cell surface, and peroxynitrite-mediated FSHR mislocalization impairs FSH-induced Akt-FoxO3a survival signaling in granulosa cells.\",\n      \"method\": \"Site-directed mutagenesis of four nitrated tyrosine residues (Y626A and others), immunofluorescence for FSHR localization, peroxynitrite treatment of KGN cells, Akt/FoxO3a phosphorylation by Western blot, apoptosis assay\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — site-directed mutagenesis identifying specific residue + localization imaging + signaling assay\",\n      \"pmids\": [\"31097679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Differential FSH glycosylation modulates FSHR oligomerization and downstream cAMP production: hypo-glycosylated FSH21/18 and high-dose eFSH rapidly dissociate FSHR oligomers into monomers (correlating with higher cAMP), while fully glycosylated FSH24 shows slower kinetics; a β-arrestin-biased agonist (truncated eLHβ + dg-eLHα) promotes FSHR homomerization.\",\n      \"method\": \"Super-resolution imaging (PD-PALM) of FSHR complexes in HEK293 cells; comparison of FSH glycoforms (FSH21/18 vs. FSH24) at multiple concentrations and time points; cAMP ELISA\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — super-resolution structural approach combined with functional cAMP assay using defined glycoform ligands\",\n      \"pmids\": [\"34925235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FSHR negative allosteric modulators ADX68692 and ADX68693 display biased antagonism at both FSHR and the closely related LH/CGR: ADX68693 more potently inhibits hCG-induced cAMP and β-arrestin 2 recruitment, and differentially suppresses progesterone and testosterone production in Leydig cells, demonstrating that cAMP and β-arrestin pathways contribute differently to FSHR- vs. LH/CGR-mediated steroidogenesis.\",\n      \"method\": \"cAMP assay in HEK293 cells and mLTC-1/rat primary Leydig cells; β-arrestin 2 recruitment assay; progesterone and testosterone ELISA; pharmacological profiling with two NAMs\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple cell types, multiple signaling endpoints, two compounds with differential pharmacological profiles\",\n      \"pmids\": [\"27424143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Granulosa cells from women homozygous for the FSHR N680S (AA) variant show lower intracellular cAMP responses to Follitropin alpha stimulation compared to women with other genotypes, providing a direct functional cellular correlate of this polymorphism.\",\n      \"method\": \"Granulosa cells isolated by flow cytometry from IVF patients, stimulated with FSH; cAMP and IP3 measured by ELISA; genotype-stratified comparison\",\n      \"journal\": \"Human reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional assay in primary human cells, single lab\",\n      \"pmids\": [\"26769719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Deletion of fetoplacental FSHR (Fshr null fetuses in Fshr wild-type dams) significantly reduces the proportion of placenta composed of labyrinth and decreases fetal vessel angiogenesis within the labyrinth, demonstrating that FSHR signaling in fetal vascular endothelium is required for placental angiogenesis.\",\n      \"method\": \"Fshr null mice with genotype-controlled pregnancies, quantitative morphometric analysis of placental labyrinths at mid-gestation\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean in vivo KO with defined morphometric phenotype and controlled genetic background\",\n      \"pmids\": [\"29715497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FSHR ablation in mice (Fshr-/- with ovariectomy) induces depression-like behaviors associated with severe oxidative stress in the brain due to reduced GCLm (glutathione synthesis) and G6PD (NADPH pathway); administration of NAC rescued the phenotype. FSH dose-dependently increased GCLm and G6PD and decreased ROS in neurons, indicating FSHR signaling maintains neuronal redox balance.\",\n      \"method\": \"Fshr-/- ovariectomized mice, behavioral tests, ROS measurement, Western blot for GCLm/G6PD; N2a neuroblastoma cells treated with FSH; NAC rescue\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO + in vitro rescue in neuronal cells, multiple endpoints, single lab\",\n      \"pmids\": [\"32203083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FSHR activates mTOR-HIF1α signaling in granulosa cells to promote follicle survival; HIF1 activation is essential for follicle growth downstream of FSH, while AMPK activation (energy shortage) drives atresia, and the FSHR-mTOR-HIF1 axis allows follicles to escape AMPK-induced atresia.\",\n      \"method\": \"Single-cell transcriptomic atlas of mouse granulosa cells, functional validation in granulosa cell models with pathway inhibitors and activators, HIF1 loss-of-function\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptomic pathway discovery with functional epistasis validation, single lab\",\n      \"pmids\": [\"37733588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIB3 upregulated by high free fatty acids reduces FSHR expression in human granulosa cells through the Akt/GSK3β pathway; TRIB3 knockdown reversed FFA-induced FSHR downregulation and restored estradiol production, and Akt inhibition in TRIB3-knockdown cells increased p-GSK3β but elevated FSHR expression, revealing TRIB3→Akt→GSK3β as a regulatory axis controlling FSHR.\",\n      \"method\": \"Primary human granulosa cells and KGN cells, palmitic acid treatment, TRIB3 siRNA knockdown, Western blot for p-Akt/p-GSK3β/TRIB3/FSHR, estradiol ELISA, p-Akt inhibitor treatment\",\n      \"journal\": \"Reproductive biology and endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNAi knockdown with pathway inhibitor rescue, multiple molecular endpoints, single lab\",\n      \"pmids\": [\"34503515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Paeoniflorin restores estradiol synthesis in ovarian granulosa cells via activation of the FSHR/cAMP/PKA/CREB signaling pathway; siRNA knockdown of FSHR and an FSHR antagonist both abolished paeoniflorin's effects, placing FSHR upstream of cAMP/PKA/CREB and aromatase induction.\",\n      \"method\": \"Cisplatin-induced DOR mouse model, KGN cells with siRNA-FSHR knockdown and FSHR antagonist, cAMP/PKA/CREB Western blot, estradiol and aromatase measurement\",\n      \"journal\": \"Molecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic (siRNA) and pharmacological (antagonist) loss-of-function with defined signaling endpoints, single lab\",\n      \"pmids\": [\"38138611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SMAD3 overexpression in rat granulosa cells promotes estrogen production and proliferation while inhibiting apoptosis, and these effects are associated with increased FSHR and PKA expression, placing SMAD3 upstream of FSHR-mediated cAMP/PKA signaling in granulosa cell function.\",\n      \"method\": \"Primary rat granulosa cells with Smad3 overexpression and RNAi knockdown, Western blot for FSHR/PKA/cyclin D2/PCNA, estrogen ELISA, flow cytometry for cell cycle and apoptosis\",\n      \"journal\": \"Reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation (OE + KD) with multiple molecular endpoints, single lab\",\n      \"pmids\": [\"23690627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TGF-β/SMAD4 signaling prevents granulosa cell apoptosis and follicular atresia in part by suppressing miR-143, which directly targets FSHR; miR-143 overexpression reduces FSHR levels and downstream PKA and AKT/p-AKT signaling, while activated TGF-β signaling rescues miR-143-induced FSHR downregulation and apoptosis.\",\n      \"method\": \"pGC knockdown of FSHR, miR-143 overexpression/inhibition, SMAD4 chromatin binding assay (luciferase/ChIP for miR-143 promoter), Western blot for PKA/AKT/p-AKT, apoptosis assay; in vivo follicular atresia model in pigs\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD, miRNA OE, promoter binding, in vivo), replicated in vitro and in vivo\",\n      \"pmids\": [\"27882941\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FSHR is a G protein-coupled receptor expressed on granulosa and Sertoli cells whose promoter is activated by USF1/2 via an E-box and repressed by OCT-1/GATA factors from an intronic silencer element; upon FSH binding, it couples primarily to Gαs/cAMP/PKA/CREB signaling and also engages β-arrestin, PI3K/AKT, and HIF1α pathways, with receptor function modulated by a scaffolding network of interacting proteins (14-3-3tau, APPL1, APPL2, Akt2, FOXO1a), by oligomerization state influenced by FSH glycoforms, by upstream regulators including androgens (via androgen receptor), BMP15 (via Smad/p38/USF1), TGF-β/SMAD4/miR-143, and TRIB3/Akt/GSK3β, and by post-translational nitration of Y626 which impairs trafficking to the cell surface; FSHR is required in vivo for folliculogenesis beyond the primary stage and for fetal placental angiogenesis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FSHR is a G protein-coupled receptor that transduces follicle-stimulating hormone signaling primarily through the Gαs/cAMP/PKA/CREB cascade, with additional engagement of β-arrestin, PI3K/AKT, and mTOR-HIF1α pathways, to drive folliculogenesis, granulosa cell survival, estradiol biosynthesis, and fetal placental angiogenesis [PMID:20086006, PMID:29715497, PMID:37733588, PMID:34925235]. FSHR transcription in Sertoli and granulosa cells depends on USF1/2 binding to a promoter E-box and is modulated by an intronic silencer occupied by OCT-1, by upstream signals including androgens, BMP15 (via Smad/p38/USF1), TGF-β/SMAD4-mediated suppression of miR-143, and metabolic regulators such as TRIB3/Akt/GSK3β [PMID:9773974, PMID:15817654, PMID:16641147, PMID:31079267, PMID:27882941, PMID:34503515]. Receptor function is further regulated by ligand glycoform-dependent oligomerization dynamics, scaffolding interactions with 14-3-3τ, APPL1/2, and FOXO1a, and by post-translational tyrosine nitration at Y626 that impairs surface trafficking and downstream Akt-FoxO3a survival signaling [PMID:34925235, PMID:15196694, PMID:17030088, PMID:31097679]. Loss-of-function mutations in FSHR, including the p.R59X nonsense variant, cause primary ovarian insufficiency by abolishing cAMP signaling and arresting folliculogenesis [PMID:29157895].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identifying the cis-regulatory logic of FSHR transcription established that USF1/2 binding to a promoter E-box is essential for FSHR expression in Sertoli cells, answering how cell-type-specific transcription is initiated.\",\n      \"evidence\": \"Deletion/block-replacement mutagenesis and EMSA with USF antibody supershift in MSC-1 line and primary Sertoli cells\",\n      \"pmids\": [\"9773974\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"USF1/2 requirement not tested in granulosa cells at this point\", \"Chromatin context (histone modifications) not addressed\", \"Distal enhancer contributions unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Discovery of 14-3-3τ as an FSH-dependent interactor of FSHR intracellular loops revealed that scaffolding proteins modulate receptor signaling output, providing the first non-G-protein binding partner of FSHR.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation in FSHR-expressing HEK293 cells, and cAMP functional assay\",\n      \"pmids\": [\"15196694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance in granulosa/Sertoli cells not tested\", \"Mechanism by which 14-3-3τ attenuates cAMP unclear\", \"Whether other 14-3-3 isoforms contribute is unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of an intronic silencer element (DHS3) bound by OCT-1 in non-expressing cells explained how FSHR transcription is repressed outside the gonad, with GATA-1 counteracting this silencing in Sertoli cells.\",\n      \"evidence\": \"DNase I hypersensitivity mapping, ChIP at endogenous locus, EMSA, and functional transfection with mutagenesis\",\n      \"pmids\": [\"15817654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether OCT-1/GATA balance shifts during development not addressed\", \"Role of DHS3 in granulosa cells unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Multiple discoveries in 2006 expanded the regulatory landscape: androgens acting through the androgen receptor upregulate FSHR mRNA in granulosa cells, APPL1/2 and FOXO1a form distinct scaffolding networks on the receptor, and distal conserved elements beyond a 413 kb transgene are needed for correct in vivo expression.\",\n      \"evidence\": \"Primary bovine granulosa cells with selective antagonists (bicalutamide/ICI); co-IP domain mapping in HEK293; YAC transgenic mice with comparative genomics\",\n      \"pmids\": [\"16641147\", \"17030088\", \"17097219\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Androgen receptor binding site on FSHR promoter not identified\", \"APPL1/2 functional contribution to FSH signaling not tested\", \"Distal regulatory elements not validated by targeted deletion in vivo\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Adenoviral FSHR rescue in Fshr-knockout mice proved that FSHR expression in granulosa cells is both required and sufficient for progression of folliculogenesis beyond the primary stage, establishing the receptor's indispensable in vivo role.\",\n      \"evidence\": \"In vivo adenoviral gene delivery into Fshr−/− mouse ovaries with histological and hormonal phenotyping\",\n      \"pmids\": [\"20086006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rescue was transient; long-term fertility not assessed\", \"Whether FSHR in theca or other ovarian cells contributes remains untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"SMAD3 was placed upstream of FSHR transcription in granulosa cells, linking TGF-β superfamily signaling to receptor abundance and downstream PKA activity.\",\n      \"evidence\": \"SMAD3 overexpression and RNAi in primary rat granulosa cells with Western blot for FSHR/PKA and estrogen measurement\",\n      \"pmids\": [\"23690627\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct SMAD3 binding to FSHR promoter not demonstrated\", \"Contribution relative to BMP/Smad1/5/8 pathway unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery of exon 2/3-skipped FSHR splice variants that abolish cAMP signaling linked receptor isoform diversity to poor ovarian response in IVF patients, connecting alternative splicing to clinical phenotype.\",\n      \"evidence\": \"RT-PCR from cumulus cells of IVF patients; reconstitution of splice variants in HEK293 cells with cAMP assay\",\n      \"pmids\": [\"24670307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism driving exon skipping unknown\", \"Prevalence in general population not determined\", \"Dominant-negative effects on wild-type receptor not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Convergent 2016 studies demonstrated biased signaling pharmacology and upstream miRNA-mediated regulation: negative allosteric modulators showed differential antagonism of cAMP vs. β-arrestin pathways, TGF-β/SMAD4 was shown to maintain FSHR levels by suppressing miR-143, and the N680S polymorphism was directly linked to reduced cAMP output in patient granulosa cells.\",\n      \"evidence\": \"NAM profiling in HEK293 and Leydig cells; miR-143 OE/inhibition with SMAD4 ChIP in porcine granulosa cells; cAMP measurement in genotype-stratified human granulosa cells from IVF\",\n      \"pmids\": [\"27424143\", \"27882941\", \"26769719\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biased agonism in vivo untested\", \"miR-143 regulation of FSHR not confirmed in human cells\", \"N680S structural basis for reduced signaling unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Loss-of-function mutations (p.R59X nonsense and R634H cytoplasmic tail) established that both receptor protein expression and proper surface trafficking are essential for FSH-induced cAMP production, with p.R59X causing primary ovarian insufficiency.\",\n      \"evidence\": \"Sanger sequencing, Western blot, and cAMP assay in transfected cells for both mutations; ovarian histology for R59X\",\n      \"pmids\": [\"29157895\", \"28446136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"R634H associated clinical phenotype from single case only\", \"Whether R634H affects β-arrestin or other non-cAMP pathways untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Fetal FSHR was shown to be required for placental labyrinth angiogenesis, extending FSHR function beyond the gonad to vascular biology during development.\",\n      \"evidence\": \"Fshr null fetuses in wild-type dams with quantitative morphometric analysis of placental labyrinths\",\n      \"pmids\": [\"29715497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream angiogenic signaling pathway not identified\", \"Whether endothelial FSHR directly activates VEGF or other angiogenic factors unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Three 2019 studies resolved distinct post-transcriptional and post-translational control mechanisms: BMP15 induces FSHR via Smad/p38-USF1 chromatin remodeling, peroxynitrite-mediated Y626 nitration sequesters FSHR intracellularly, and TRIB3/Akt/GSK3β links metabolic stress to FSHR downregulation.\",\n      \"evidence\": \"ChIP for histone marks and USF1/2 at FSHR promoter in HGrC1 cells; Y626A mutagenesis with immunofluorescence and Akt/FoxO3a signaling in KGN cells; TRIB3 siRNA with Akt inhibitor rescue in primary human granulosa cells\",\n      \"pmids\": [\"31079267\", \"31097679\", \"34503515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of Y626 nitration not established\", \"BMP15-USF1 axis not validated in primary human follicles\", \"TRIB3 mechanism at FSHR promoter (direct vs. indirect) unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Super-resolution imaging revealed that FSH glycoform composition controls FSHR oligomerization dynamics — hypo-glycosylated FSH dissociates oligomers into monomers correlating with higher cAMP, while β-arrestin-biased ligands promote homomerization — providing a structural basis for ligand-biased signaling.\",\n      \"evidence\": \"PD-PALM super-resolution imaging of FSHR in HEK293 cells with defined FSH glycoforms and cAMP ELISA\",\n      \"pmids\": [\"34925235\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Oligomerization dynamics not assessed in primary granulosa/Sertoli cells\", \"Structural interface mediating oligomer-monomer transition undefined\", \"Physiological ratio of FSH glycoforms in follicular fluid not linked to receptor state\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"FSHR was placed at the apex of an mTOR-HIF1α survival axis in granulosa cells, explaining how FSH signaling enables follicles to escape AMPK-driven atresia and linking receptor activation to metabolic control of follicle fate.\",\n      \"evidence\": \"Single-cell transcriptomics of mouse granulosa cells with functional validation using pathway inhibitors and HIF1 loss-of-function\",\n      \"pmids\": [\"37733588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"HIF1α target genes mediating survival not fully identified\", \"Whether this axis operates in human follicles untested\", \"Interaction with BMP15/TRIB3 regulatory inputs not examined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions include the structural basis of FSHR oligomerization and its transition upon ligand binding, the in vivo significance of post-translational modifications such as Y626 nitration, the identity of downstream angiogenic effectors of placental FSHR, and how the multiple transcriptional inputs (USF, SMAD, androgen receptor, miR-143) are integrated in a follicle-stage-specific manner.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of full-length FSHR in active oligomeric state\", \"No in vivo confirmation that Y626 nitration regulates fertility\", \"Placental FSHR downstream signaling cascade undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 7, 8, 12, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [12, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [9, 11, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 12, 13, 17, 19]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 15]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [6, 7, 8]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 3, 10, 21]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"YWHAQ\",\n      \"APPL1\",\n      \"APPL2\",\n      \"AKT2\",\n      \"FOXO1\",\n      \"ARRB2\",\n      \"USF1\",\n      \"USF2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}