{"gene":"INHA","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":1986,"finding":"The human INHA gene encodes the alpha subunit of inhibin, a glycoprotein whose cDNA was cloned from porcine ovary and human placenta; the alpha subunit is synthesized as a larger precursor and the mRNA is expressed specifically in the gonads, with expression inducible by gonadotropins.","method":"cDNA cloning and nucleotide sequencing, Northern blot expression analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — original cloning with sequence determination and functional expression characterization, foundational study","pmids":["3016724"],"is_preprint":false},{"year":1986,"finding":"Human inhibin exists as two heterodimeric forms (inhibin A and inhibin B), each composed of a common alpha subunit (INHA product) disulfide-linked to one of two distinct beta subunits (beta A or beta B); the human alpha subunit shares 84% sequence conservation with its porcine counterpart.","method":"cDNA cloning and nucleotide sequencing of subunit precursors","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — complete amino acid sequences determined by cDNA cloning, foundational structural characterization","pmids":["3754442"],"is_preprint":false},{"year":1986,"finding":"The human INHA (alpha subunit) gene is present as a single copy and maps to chromosome 2q33-qter, while the beta B subunit gene maps to chromosome 2cen-q13; both alpha and beta B map to mouse chromosome 1.","method":"Southern blot analysis of somatic cell hybrid DNAs and in situ hybridization","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — chromosomal mapping by multiple orthogonal methods (somatic cell hybrids and in situ hybridization)","pmids":["2767687"],"is_preprint":false},{"year":1986,"finding":"The INHA gene has a defined genomic structure; cloning and sequencing of the human genomic locus confirmed single-copy status and provided the genomic sequence of the alpha subunit.","method":"Southern blot hybridization, cloning from lambda genomic libraries, DNA sequencing","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — direct genomic cloning and sequencing","pmids":["3758355"],"is_preprint":false},{"year":1991,"finding":"Follistatin binds to inhibin (INHA-containing heterodimer) through the common beta subunit, not the alpha subunit; inhibin A has only one follistatin binding site (through its beta subunit), whereas activin A has two, establishing that the INHA alpha subunit does not mediate follistatin binding.","method":"Double-ligand blotting technique","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 3 — single binding assay method defining which subunit mediates follistatin interaction","pmids":["2036994"],"is_preprint":false},{"year":1992,"finding":"Targeted deletion of the alpha-inhibin gene (Inha) in mice results in development of mixed or incompletely differentiated gonadal stromal tumors in every animal, establishing INHA as a gonad-specific tumor suppressor gene and a critical negative regulator of gonadal stromal cell proliferation.","method":"Homologous recombination in mouse embryonic stem cells (gene knockout), histopathological analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — clean knockout with complete penetrance phenotype, foundational paper with 818 citations","pmids":["1448148"],"is_preprint":false},{"year":1995,"finding":"Inhibin (INHA-containing heterodimer) antagonizes activin-mediated inhibition of hepatocyte DNA synthesis through a dominant-negative mechanism: inhibin binds ActRII via its beta subunit and competes with activin for ActRII binding, but fails to recruit the type I receptor (SKR2), thereby blocking formation of the active ActRII-activin-SKR2 signaling complex.","method":"Receptor crosslinking assays, competitive binding assays, DNA synthesis measurement in HepG2 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding and functional assays with multiple readouts establishing dominant-negative mechanism","pmids":["7890768"],"is_preprint":false},{"year":1997,"finding":"Inhibin's antagonism of activin-induced erythroid differentiation and receptor heteromerization is mediated through competition for the type II activin receptor (ActRII), and requires an additional inhibin-specific binding component beyond ActRII itself.","method":"Stable inducible cell lines overexpressing ActRII/ALK4; activin/inhibin treatment assays; hemoglobin accumulation and proliferation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — stable cell lines with defined receptor expression, multiple functional readouts, identifies requirement for co-receptor","pmids":["9032295"],"is_preprint":false},{"year":2000,"finding":"Betaglycan (type III TGF-beta receptor) functions as a high-affinity co-receptor for inhibin (INHA-containing heterodimer) together with ActRII; betaglycan enhances inhibin binding to cells co-expressing ActRII, inhibin forms crosslinked complexes with both betaglycan and ActRII, and betaglycan confers inhibin responsiveness to cell lines otherwise insensitive to inhibin, enabling functional antagonism of activin signaling.","method":"Crosslinking assays, co-immunoprecipitation, binding studies in transfected cells, functional activin antagonism assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (crosslinking, co-IP, binding, functional assays) in single study; 478 citations","pmids":["10746731"],"is_preprint":false},{"year":2000,"finding":"Three hydrophobic residues on ActRII (Phe42, Trp60, Phe83) form a critical binding surface required for functional interactions with both activin and inhibin (INHA-containing heterodimer); alanine substitution at each position disrupts inhibin binding, confirming that inhibin binds ActRII at the same interface as activin.","method":"Alanine scanning mutagenesis of ActRII extracellular domain, crosslinking binding assays, signaling assays in corticotroph cell lines","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — systematic mutagenesis with multiple functional readouts defining the inhibin-binding surface on ActRII","pmids":["10652306"],"is_preprint":false},{"year":2000,"finding":"The activin betaC subunit can dimerize with betaA and betaB subunits in vitro but cannot form a heterodimer with the inhibin alpha subunit (INHA), establishing that the alpha subunit has selective dimerization specificity restricted to beta A and beta B subunits.","method":"Mammalian cell co-expression and dimerization assays, immunolocalization","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 3 — in vitro dimerization assay establishing subunit selectivity of INHA","pmids":["11134153"],"is_preprint":false},{"year":2009,"finding":"In zebrafish, the inha (inhibin alpha subunit ortholog) is expressed exclusively in somatic follicle cells of the ovary (not in oocytes, pituitary, or brain); FSH (but not LH) significantly stimulates inha expression in cultured ovarian fragments; and human inhibin A inhibits oocyte maturation in vitro, suggesting a conserved negative feedback loop between pituitary FSH and ovarian inhibin.","method":"In situ hybridization, RT-PCR tissue expression profiling, recombinant FSH/LH treatment of cultured ovarian fragments, in vitro oocyte maturation assay","journal":"Reproduction (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — multiple experimental approaches in zebrafish model establishing expression, regulation, and functional effect of inha ortholog","pmids":["19602521"],"is_preprint":false},{"year":2013,"finding":"In Inha-null prepubertal mouse ovaries, GDF9 drives initial defects in preantral follicle growth; deletion of Gdf9 from Inha(-/-) mice rescues early follicle growth defects and reduces the activin/inhibin beta B subunit (Inhbb) upregulation seen in Inha(-/-) ovaries, but paradoxically accelerates pretumor lesion onset, establishing a sequential genetic epistasis where GDF9 promotes defective folliculogenesis and suppresses tumor initiation in the Inha-null context.","method":"Double knockout mouse genetics (Inha x Gdf9), histological follicle staging, immunohistochemistry, qRT-PCR","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 — double knockout genetic epistasis with multiple phenotypic readouts defining GDF9-INHA pathway interaction","pmids":["23446452"],"is_preprint":false},{"year":2023,"finding":"Loss of inha (inhibin alpha) in zebrafish partially rescues the follicle development arrest and sex reversal caused by bmp15 deficiency; the bmp15/inha double mutant progresses to mid-vitellogenic follicle stage with yolk accumulation, and this rescue is dependent on increased inhbaa (activin betaAa) expression driving estradiol production, vitellogenin biosynthesis, and oocyte uptake via LRP receptors — establishing that INHA/inhibin restrains activin-mediated pathways that BMP15 normally promotes to sustain folliculogenesis.","method":"CRISPR/Cas9 knockouts (bmp15, inha, inhbaa single, double, and triple mutants), follicle staging, RNAseq transcriptome analysis, serum estradiol and vitellogenin measurements, aromatase inhibitor treatment, E2 rescue experiments","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 1-2 — triple mutant genetic epistasis with transcriptomics, hormone measurements, and pharmacological rescue providing strong mechanistic evidence","pmids":["37713421"],"is_preprint":false}],"current_model":"INHA encodes the alpha subunit of inhibin, a disulfide-linked heterodimer (alpha:beta) that functions as a gonad-specific tumor suppressor and antagonist of activin signaling: inhibin binds ActRII (at residues Phe42, Trp60, Phe83) through its beta subunit in a complex facilitated by the co-receptor betaglycan, competitively blocking activin-induced recruitment of the type I receptor (ALK4) and downstream Smad signaling; in the gonad, INHA-containing inhibin restrains activin/GDF9-driven granulosa cell proliferation and folliculogenesis, with Inha-null mice universally developing gonadal stromal tumors, and zebrafish genetics revealing that inhibin suppresses activin betaAa-mediated estradiol production required for vitellogenin-dependent oocyte growth."},"narrative":{"teleology":[{"year":1986,"claim":"Cloning and sequencing of the INHA gene and its two beta subunit partners established that inhibin is a heterodimeric glycoprotein (α:βA or α:βB) encoded by a single-copy gene on chromosome 2q, expressed specifically in the gonads under gonadotropin control.","evidence":"cDNA cloning from porcine ovary and human placenta, Northern blots, Southern blot analysis of somatic cell hybrids, in situ hybridization, genomic sequencing","pmids":["3016724","3754442","2767687","3758355"],"confidence":"High","gaps":["Post-translational processing steps of the alpha subunit precursor were not fully characterized","Gonadal cell types producing INHA protein were not resolved at single-cell level"]},{"year":1992,"claim":"Targeted deletion of the Inha gene demonstrated that the alpha subunit is an essential tumor suppressor, as Inha-null mice universally develop gonadal stromal tumors — the first genetic proof of a secreted hormone acting as a tumor suppressor.","evidence":"Homologous recombination knockout in mouse ES cells, histopathological analysis showing 100% penetrance of gonadal tumors","pmids":["1448148"],"confidence":"High","gaps":["Downstream signaling events linking loss of inhibin to tumorigenesis were not defined","Whether tumor suppression is cell-autonomous or paracrine was unresolved"]},{"year":1995,"claim":"Biochemical dissection of inhibin's antagonism of activin revealed a dominant-negative mechanism: inhibin binds ActRII through its beta subunit but cannot recruit the type I receptor, blocking activin signaling complex formation.","evidence":"Receptor crosslinking, competitive binding assays, and DNA synthesis measurement in HepG2 cells","pmids":["7890768"],"confidence":"High","gaps":["The contribution of the alpha subunit to receptor binding was unclear","Identity of the postulated inhibin-specific co-receptor remained unknown"]},{"year":2000,"claim":"Identification of betaglycan as the inhibin co-receptor and mapping of the shared ActRII binding interface (Phe42, Trp60, Phe83) completed the model of inhibin's competitive antagonism, explaining how inhibin achieves high-affinity activin blockade in co-receptor-expressing tissues.","evidence":"Crosslinking, co-immunoprecipitation, transfection-based binding and functional assays (betaglycan); alanine scanning mutagenesis of ActRII extracellular domain with crosslinking and signaling assays","pmids":["10746731","10652306"],"confidence":"High","gaps":["Structural basis of the ternary inhibin–betaglycan–ActRII complex was not determined at atomic resolution","Whether betaglycan mediates inhibin tumor suppression in vivo was untested"]},{"year":2013,"claim":"Genetic epistasis in Inha/Gdf9 double-knockout mice revealed that GDF9 drives the initial follicular growth defects in Inha-null ovaries but paradoxically suppresses tumor initiation, separating the folliculogenesis and tumor suppression functions of inhibin.","evidence":"Double knockout mouse genetics (Inha × Gdf9), histological follicle staging, immunohistochemistry, qRT-PCR","pmids":["23446452"],"confidence":"High","gaps":["Cell-type-specific signaling mediating GDF9's tumor-suppressive role in the Inha-null context was undefined","Whether activin betaB upregulation is the proximate tumorigenic signal was not directly tested"]},{"year":2023,"claim":"Triple-mutant zebrafish genetics demonstrated that loss of inha rescues bmp15-deficient follicle arrest through derepression of activin betaAa, which drives estradiol biosynthesis and vitellogenin-dependent oocyte growth — establishing that inhibin's core reproductive function is to restrain activin-mediated estradiol production.","evidence":"CRISPR/Cas9 single, double, and triple knockouts (bmp15, inha, inhbaa); RNAseq; serum estradiol and vitellogenin measurements; aromatase inhibitor treatment and E2 rescue","pmids":["37713421"],"confidence":"High","gaps":["Whether this estradiol-mediated mechanism operates in mammalian granulosa cells remains untested","The direct activin target genes mediating aromatase induction were not identified"]},{"year":null,"claim":"No high-resolution structure of the full inhibin heterodimer in complex with betaglycan and ActRII exists, and the mechanism by which loss of inhibin triggers stromal tumor initiation (as opposed to hyperplasia) has not been resolved at the signaling pathway level.","evidence":"","pmids":[],"confidence":"High","gaps":["Atomic-resolution structure of the inhibin–betaglycan–ActRII ternary complex is lacking","Cell-autonomous versus paracrine mechanisms of tumor suppression in the gonad remain undefined","Whether INHA mutations contribute to human gonadal tumorigenesis is not established by direct genetic evidence"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[6,7,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,7,8,9]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,6,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,7,8,9]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[12,13]}],"complexes":["Inhibin A (alpha:betaA heterodimer)","Inhibin B (alpha:betaB heterodimer)","Inhibin–betaglycan–ActRII ternary complex"],"partners":["INHBA","INHBB","ACVR2A","TGFBR3","GDF9"],"other_free_text":[]},"mechanistic_narrative":"INHA encodes the alpha subunit of inhibin, a disulfide-linked heterodimeric glycoprotein (inhibin A = α:βA; inhibin B = α:βB) that functions as a gonad-specific tumor suppressor and a competitive antagonist of activin signaling [PMID:3016724, PMID:3754442, PMID:1448148]. Inhibin binds the type II activin receptor (ActRII) via its beta subunit at a hydrophobic interface (Phe42, Trp60, Phe83) shared with activin, but fails to recruit the type I receptor ALK4, thereby acting as a dominant-negative blocker of activin-induced Smad signaling; high-affinity antagonism requires the co-receptor betaglycan [PMID:7890768, PMID:10652306, PMID:10746731]. Targeted deletion of Inha in mice causes fully penetrant gonadal stromal tumors, and genetic epistasis studies in mouse and zebrafish demonstrate that INHA-containing inhibin restrains activin/GDF9-driven granulosa cell proliferation, folliculogenesis, and estradiol-dependent oocyte growth [PMID:1448148, PMID:23446452, PMID:37713421]."},"prefetch_data":{"uniprot":{"accession":"P05111","full_name":"Inhibin alpha chain","aliases":[],"length_aa":366,"mass_kda":39.7,"function":"Inhibins and activins inhibit and activate, respectively, the secretion of follitropin by the pituitary gland. Inhibins/activins are involved in regulating a number of diverse functions such as hypothalamic and pituitary hormone secretion, gonadal hormone secretion, germ cell development and maturation, erythroid differentiation, insulin secretion, nerve cell survival, embryonic axial development or bone growth, depending on their subunit composition. Inhibins appear to oppose the functions of activins Inhibin A is a dimer of alpha/INHA and beta-A/INHBA that functions as a feedback regulator in the hypothalamic-pituitary-gonadal (HPG) axis. Inhibits the secretion of FSH from the anterior pituitary gland by acting on pituitary gonadotrope cells. Antagonizes activin A by binding to the proteoglycan, betaglycan, and forming a stable complex with and, thereby, sequestering type II activin receptors while excluding type I receptor Inhibin B is a dimer of alpha and beta-B that plays a crucial role in the regulation of the reproductive system by inhibiting the secretion of follicle-stimulating hormone (FSH) from the anterior pituitary gland. Thereby, maintains reproductive homeostasis in both males and females. Acts as a more potent suppressor of FSH release than inhibin A (By similarity). Functions as competitive receptor antagonist binding activin type II receptors with high affinity in the presence of the TGF-beta type III coreceptor/TGFBR3L (PubMed:34910520)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P05111/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/INHA","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/INHA","total_profiled":1310},"omim":[{"mim_id":"620922","title":"LEUCINE-RICH REPEATS- AND IQ MOTIF-CONTAINING PROTEIN 1; LRRIQ1","url":"https://www.omim.org/entry/620922"},{"mim_id":"616425","title":"46,XY SEX REVERSAL 10; SRXY10","url":"https://www.omim.org/entry/616425"},{"mim_id":"600963","title":"SIX HOMEOBOX 5; SIX5","url":"https://www.omim.org/entry/600963"},{"mim_id":"311360","title":"PREMATURE OVARIAN FAILURE 1; POF1","url":"https://www.omim.org/entry/311360"},{"mim_id":"276400","title":"TWINNING, DIZYGOTIC","url":"https://www.omim.org/entry/276400"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adrenal gland","ntpm":75.8},{"tissue":"ovary","ntpm":108.7},{"tissue":"testis","ntpm":101.4}],"url":"https://www.proteinatlas.org/search/INHA"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P05111","domains":[{"cath_id":"2.10.90.10","chopping":"24-43_260-297_324-366","consensus_level":"medium","plddt":85.8053,"start":24,"end":366},{"cath_id":"2.60.120.970","chopping":"81-92_109-140_152-221","consensus_level":"high","plddt":85.1645,"start":81,"end":221}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P05111","model_url":"https://alphafold.ebi.ac.uk/files/AF-P05111-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P05111-F1-predicted_aligned_error_v6.png","plddt_mean":70.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=INHA","jax_strain_url":"https://www.jax.org/strain/search?query=INHA"},"sequence":{"accession":"P05111","fasta_url":"https://rest.uniprot.org/uniprotkb/P05111.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P05111/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P05111"}},"corpus_meta":[{"pmid":"8284673","id":"PMC_8284673","title":"inhA, 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InhA.","date":"2018","source":"ChemMedChem","url":"https://pubmed.ncbi.nlm.nih.gov/29399991","citation_count":14,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"33032201","id":"PMC_33032201","title":"An integrated computational investigation to unveil the structural impacts of mutation on the InhA structural gene of Mycobacterium tuberculosis.","date":"2020","source":"Journal of molecular graphics & modelling","url":"https://pubmed.ncbi.nlm.nih.gov/33032201","citation_count":13,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12477932","id":"PMC_12477932","title":"Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences.","date":"2002","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/12477932","citation_count":1479,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26186194","id":"PMC_26186194","title":"The BioPlex Network: A Systematic Exploration of the Human Interactome.","date":"2015","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/26186194","citation_count":1118,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"28514442","id":"PMC_28514442","title":"Architecture of the human interactome defines protein communities and disease networks.","date":"2017","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/28514442","citation_count":1085,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25416956","id":"PMC_25416956","title":"A proteome-scale map of the human interactome network.","date":"2014","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/25416956","citation_count":977,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"1448148","id":"PMC_1448148","title":"Alpha-inhibin is a tumour-suppressor gene with gonadal specificity in mice.","date":"1992","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/1448148","citation_count":818,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"33961781","id":"PMC_33961781","title":"Dual proteome-scale networks reveal cell-specific remodeling of the human interactome.","date":"2021","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/33961781","citation_count":705,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21873635","id":"PMC_21873635","title":"Phylogenetic-based propagation of functional annotations within the Gene Ontology consortium.","date":"2011","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/21873635","citation_count":656,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10746731","id":"PMC_10746731","title":"Betaglycan binds inhibin and can mediate functional antagonism of activin signalling.","date":"2000","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/10746731","citation_count":478,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25910212","id":"PMC_25910212","title":"Widespread macromolecular interaction perturbations in human genetic disorders.","date":"2015","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/25910212","citation_count":454,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15489334","id":"PMC_15489334","title":"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).","date":"2004","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/15489334","citation_count":438,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"3754442","id":"PMC_3754442","title":"Structure of two human ovarian inhibins.","date":"1986","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/3754442","citation_count":324,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"2036994","id":"PMC_2036994","title":"Follistatin binds to both activin and inhibin through the common subunit.","date":"1991","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/2036994","citation_count":270,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"2770810","id":"PMC_2770810","title":"Inhibin as a marker for granulosa-cell tumors.","date":"1989","source":"The New England journal of medicine","url":"https://pubmed.ncbi.nlm.nih.gov/2770810","citation_count":270,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"3016724","id":"PMC_3016724","title":"Inhibin A-subunit cDNAs from porcine ovary and human placenta.","date":"1986","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/3016724","citation_count":260,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12324653","id":"PMC_12324653","title":"Activins, inhibins, and follistatins: from endocrinology to signaling. A paradigm for the new millennium.","date":"2002","source":"Experimental biology and medicine (Maywood, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/12324653","citation_count":259,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"3267209","id":"PMC_3267209","title":"Erythroid differentiation factor is encoded by the same mRNA as that of the inhibin beta A chain.","date":"1988","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/3267209","citation_count":254,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17847007","id":"PMC_17847007","title":"Mutation in WNT10A is associated with an autosomal recessive ectodermal dysplasia: the odonto-onycho-dermal dysplasia.","date":"2007","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17847007","citation_count":183,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9032295","id":"PMC_9032295","title":"Activin and inhibin have antagonistic effects on ligand-dependent heteromerization of the type I and type II activin receptors and human erythroid differentiation.","date":"1997","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/9032295","citation_count":144,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11098038","id":"PMC_11098038","title":"Inhibin: a candidate gene for premature ovarian failure.","date":"2000","source":"Human reproduction (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/11098038","citation_count":130,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15214825","id":"PMC_15214825","title":"Granular cell tumor: immunohistochemical assessment of inhibin-alpha, protein gene product 9.5, S100 protein, CD68, and Ki-67 proliferative index with clinical correlation.","date":"2004","source":"Archives of pathology & laboratory medicine","url":"https://pubmed.ncbi.nlm.nih.gov/15214825","citation_count":127,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25051334","id":"PMC_25051334","title":"Inhibin at 90: from discovery to clinical application, a historical review.","date":"2014","source":"Endocrine reviews","url":"https://pubmed.ncbi.nlm.nih.gov/25051334","citation_count":126,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"2575216","id":"PMC_2575216","title":"Activin B: precursor sequences, genomic structure and in vitro activities.","date":"1989","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/2575216","citation_count":125,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"7890768","id":"PMC_7890768","title":"Inhibin antagonizes inhibition of liver cell growth by activin by a dominant-negative mechanism.","date":"1995","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7890768","citation_count":110,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17603052","id":"PMC_17603052","title":"Statistically significant changes of antimüllerian hormone and inhibin levels during the physiologic menstrual cycle in reproductive age women.","date":"2007","source":"Fertility and sterility","url":"https://pubmed.ncbi.nlm.nih.gov/17603052","citation_count":107,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20734064","id":"PMC_20734064","title":"A large-scale candidate gene association study of age at menarche and age at natural menopause.","date":"2010","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20734064","citation_count":106,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"3758355","id":"PMC_3758355","title":"Human inhibin genes. Genomic characterisation and sequencing.","date":"1986","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/3758355","citation_count":105,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11134153","id":"PMC_11134153","title":"Localization of activin beta(A)-, beta(B)-, and beta(C)-subunits in humanprostate and evidence for formation of new activin heterodimers of beta(C)-subunit.","date":"2000","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/11134153","citation_count":92,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8267637","id":"PMC_8267637","title":"Activin A induces apoptotic cell death.","date":"1993","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/8267637","citation_count":90,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10652306","id":"PMC_10652306","title":"Identification of a binding site on the type II activin receptor for activin and inhibin.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10652306","citation_count":89,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"2767687","id":"PMC_2767687","title":"Mapping of genes for inhibin subunits alpha, beta A, and beta B on human and mouse chromosomes and studies of jsd mice.","date":"1989","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/2767687","citation_count":85,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46604,"output_tokens":1388,"usd":0.080316},"stage2":{"model":"claude-opus-4-6","input_tokens":4174,"output_tokens":1398,"usd":0.08373},"total_usd":0.415282,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":59201,"output_tokens":4369,"usd":0.121569},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6874,"output_tokens":2083,"usd":0.129667}},"stage1_raw":"Looking at the corpus, I need to identify what gene \"INHA\" refers to. The vast majority of papers describe **InhA** from *Mycobacterium tuberculosis* — an enoyl-ACP reductase in the fatty acid (mycolic acid) biosynthesis pathway. A few papers describe the human/mammalian **INHA** (inhibin alpha subunit), which is a TGF-β family member involved in ovarian function (PMIDs: 19363042, 26654447, 37713421, 19602521, 23446452). These are clearly different proteins.\n\nSince the query gene is \"INHA\" and the corpus is heavily dominated by the *M. tuberculosis* **inhA** (enoyl-ACP reductase), I must determine which is the intended query. The mammalian INHA (inhibin alpha subunit) papers are present but few. The *M. tuberculosis* inhA papers are foundational mechanistic papers. Given the preponderance of the corpus, the gene being queried appears to be the mycobacterial **inhA** (enoyl-ACP reductase), not the mammalian inhibin alpha. However, the instructions say \"the query is ALWAYS a human (or mammalian-model) gene.\" This means I should treat the mycobacterial inhA papers as potential symbol collisions, and focus on the mammalian INHA (inhibin alpha subunit) papers.\n\nRe-evaluating: Papers about mammalian INHA (inhibin alpha): 19602521 (zebrafish inha - ortholog), 23446452 (mouse Inha knockout), 37713421 (zebrafish inha CRISPR), 19363042 (human INHA variants/POF - association study, exclude), 26654447 (DNA methylation/biomarker - exclude).\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"In zebrafish, the inhibin alpha subunit (inha) is expressed exclusively in ovarian follicle cells (not oocytes or pituitary), is stimulated by FSH (but not LH) in cultured ovarian fragments, and recombinant human inhibin A inhibits oocyte maturation in vitro, supporting a negative feedback loop between the pituitary and ovary mediated by inhibin.\",\n      \"method\": \"In situ hybridization, FSH/LH treatment of cultured ovarian fragments, recombinant protein functional assay (oocyte maturation inhibition)\",\n      \"journal\": \"Reproduction (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct localization by expression analysis plus functional assay with recombinant protein in a vertebrate ortholog; single lab\",\n      \"pmids\": [\"19602521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Deletion of Gdf9 from Inha-null (Inha−/−) mice rescues early follicle growth defects and reduces activin/inhibin beta B subunit (Inhbb) upregulation, demonstrating that GDF9 acts upstream to promote defective folliculogenesis and suppress tumor initiation in the absence of inhibin alpha; these data place inhibin alpha as a suppressor of GDF9-driven granulosa cell growth in the ovary.\",\n      \"method\": \"Genetic epistasis — Inha/Gdf9 double knockout mice; folliculogenesis phenotype analysis; qRT-PCR of Inhbb\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean double-KO epistasis with defined folliculogenesis and tumor phenotype readouts, multiple molecular markers\",\n      \"pmids\": [\"23446452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In zebrafish, loss of inhibin alpha (inha−/−) partially rescues bmp15-mutant follicle arrest and sex reversal; the double mutant (bmp15−/−;inha−/−) progresses to mid-vitellogenic stage with yolk accumulation. Further knockout of inhbaa (activin βAa) in the triple mutant reverses this rescue, reducing estradiol and vitellogenin. These genetic epistasis experiments demonstrate that inhibin alpha (inha) acts downstream of BMP15 to suppress activin (inhbaa-dependent) signaling, which drives estradiol production and yolk uptake during folliculogenesis.\",\n      \"method\": \"CRISPR/Cas9 knockout — single, double, and triple mutants (bmp15, inha, inhbaa); folliculogenesis staging; serum estradiol and vitellogenin measurement; transcriptome analysis; aromatase inhibitor treatment\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multi-allele genetic epistasis with loss-of-function and rescue experiments, orthogonal hormone measurements and transcriptomics; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"37713421\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"The inhibin alpha subunit (INHA) forms inhibin dimers in ovarian follicle somatic cells; its expression is stimulated by FSH, and it suppresses activin/BMP15-driven signaling to regulate estradiol production, follicle development, and the pituitary-gonadal feedback axis, with loss of inhibin alpha leading to unrestrained activin signaling, defective folliculogenesis, and in mice, granulosa cell tumor development.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI need to classify all papers first before extracting discoveries.\n\n**Classification:**\n\nThe gene query is INHA. Looking at the corpus, there are clearly two completely different genes:\n\n1. **Mycobacterium tuberculosis inhA** (enoyl-ACP reductase, target of isoniazid) — Papers [1]-[100] from the retrieved corpus are mostly about this bacterial enzyme. This is a SYMBOL COLLISION — the bacterial inhA is a fundamentally different protein (enoyl-ACP reductase involved in mycolic acid biosynthesis) from the human INHA gene (inhibin alpha subunit, a TGF-beta family member).\n\n2. **Human INHA** (inhibin alpha subunit) — Papers in the gene2pubmed-curated list include papers about the human inhibin alpha subunit.\n\nLet me identify KEEP papers (human/mammalian INHA = inhibin alpha subunit):\n\nFrom retrieved corpus:\n- [53] Zebrafish inha (inhibin alpha) — zebrafish ortholog of human INHA, follicle cells, FSH feedback — KEEP\n- [68] Human INHA gene variants and premature ovarian failure — GWAS/association, no mechanism — EXCLUDE (expression/association)\n- [82] Zebrafish inha knockout rescues bmp15 mutant — genetic epistasis, mechanistic — KEEP\n- [86] Inha-null mouse + GDF9 double knockout — genetic epistasis, mechanistic — KEEP\n- [90] Placental DNA methylation and INHA serum levels — biomarker/correlation — EXCLUDE\n\nFrom gene2pubmed-curated:\n- [1] MGC cDNA sequences — no mechanism — EXCLUDE\n- [2] BioPlex 2015 — mass spec interactome, INHA listed — KEEP (interaction data)\n- [3] BioPlex 2017 — mass spec interactome — KEEP\n- [4] Human interactome map 2014 — KEEP (but no specific INHA mechanism)\n- [5] Alpha-inhibin tumor suppressor in mice (Matzuk 1992) — KEEP (knockout, mechanism)\n- [6] BioPlex 3.0 2021 — KEEP\n- [7] GO phylogenetic annotation — EXCLUDE (computational)\n- [8] Betaglycan binds inhibin — KEEP (direct binding, mechanism)\n- [9] Disease mutations and interactome — KEEP if INHA specifically mentioned, but no specific INHA mechanism described\n- [10] MGC cDNA — EXCLUDE\n- [11] Structure of human ovarian inhibins — KEEP (structural/sequence)\n- [12] Follistatin binds inhibin through beta subunit — KEEP (binding mechanism)\n- [13] Inhibin as marker for granulosa-cell tumors — biomarker — EXCLUDE (no mechanism)\n- [14] Inhibin A-subunit cDNA from porcine ovary and human placenta — KEEP (cloning, expression pattern)\n- [15] Activins, inhibins, follistatins review — review, no new mechanism from this paper alone — EXCLUDE\n- [16] EDF = inhibin beta A chain — about INHBA not INHA — EXCLUDE\n- [17] WNT10A mutation — EXCLUDE (different gene)\n- [18] Activin/inhibin antagonism via ActRII — KEEP (mechanism of inhibin antagonism)\n- [19] INHA as candidate gene for POF — variant association — EXCLUDE (no mechanism)\n- [20] Granular cell tumor immunohistochemistry — diagnostic/expression — EXCLUDE\n- [21] Inhibin review — review — EXCLUDE\n- [22] Activin B sequences — about INHBB — EXCLUDE\n- [23] Inhibin antagonizes activin via dominant-negative mechanism — KEEP (mechanism)\n- [24] AMH and inhibin during menstrual cycle — endocrine measurements — EXCLUDE\n- [25] Candidate gene association age at menarche/menopause — GWAS — EXCLUDE\n- [26] Human inhibin genes genomic characterization — KEEP (genomic structure)\n- [27] Activin betaC in prostate — about activin subunits, notes inhibin alpha cannot form heterodimer with betaC — partial KEEP\n- [28] Activin A induces apoptosis — about activin not inhibin alpha specifically — EXCLUDE\n- [29] Binding site on ActRII for activin and inhibin — KEEP (mechanism)\n- [30] Chromosomal mapping of inhibin genes — KEEP (gene mapping)\n\nNow extracting discoveries from KEPT papers only:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1986,\n      \"finding\": \"The human INHA gene encodes the alpha subunit of inhibin, a glycoprotein whose cDNA was cloned from porcine ovary and human placenta; the alpha subunit is synthesized as a larger precursor and the mRNA is expressed specifically in the gonads, with expression inducible by gonadotropins.\",\n      \"method\": \"cDNA cloning and nucleotide sequencing, Northern blot expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning with sequence determination and functional expression characterization, foundational study\",\n      \"pmids\": [\"3016724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"Human inhibin exists as two heterodimeric forms (inhibin A and inhibin B), each composed of a common alpha subunit (INHA product) disulfide-linked to one of two distinct beta subunits (beta A or beta B); the human alpha subunit shares 84% sequence conservation with its porcine counterpart.\",\n      \"method\": \"cDNA cloning and nucleotide sequencing of subunit precursors\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — complete amino acid sequences determined by cDNA cloning, foundational structural characterization\",\n      \"pmids\": [\"3754442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"The human INHA (alpha subunit) gene is present as a single copy and maps to chromosome 2q33-qter, while the beta B subunit gene maps to chromosome 2cen-q13; both alpha and beta B map to mouse chromosome 1.\",\n      \"method\": \"Southern blot analysis of somatic cell hybrid DNAs and in situ hybridization\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — chromosomal mapping by multiple orthogonal methods (somatic cell hybrids and in situ hybridization)\",\n      \"pmids\": [\"2767687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"The INHA gene has a defined genomic structure; cloning and sequencing of the human genomic locus confirmed single-copy status and provided the genomic sequence of the alpha subunit.\",\n      \"method\": \"Southern blot hybridization, cloning from lambda genomic libraries, DNA sequencing\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct genomic cloning and sequencing\",\n      \"pmids\": [\"3758355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Follistatin binds to inhibin (INHA-containing heterodimer) through the common beta subunit, not the alpha subunit; inhibin A has only one follistatin binding site (through its beta subunit), whereas activin A has two, establishing that the INHA alpha subunit does not mediate follistatin binding.\",\n      \"method\": \"Double-ligand blotting technique\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single binding assay method defining which subunit mediates follistatin interaction\",\n      \"pmids\": [\"2036994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Targeted deletion of the alpha-inhibin gene (Inha) in mice results in development of mixed or incompletely differentiated gonadal stromal tumors in every animal, establishing INHA as a gonad-specific tumor suppressor gene and a critical negative regulator of gonadal stromal cell proliferation.\",\n      \"method\": \"Homologous recombination in mouse embryonic stem cells (gene knockout), histopathological analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — clean knockout with complete penetrance phenotype, foundational paper with 818 citations\",\n      \"pmids\": [\"1448148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Inhibin (INHA-containing heterodimer) antagonizes activin-mediated inhibition of hepatocyte DNA synthesis through a dominant-negative mechanism: inhibin binds ActRII via its beta subunit and competes with activin for ActRII binding, but fails to recruit the type I receptor (SKR2), thereby blocking formation of the active ActRII-activin-SKR2 signaling complex.\",\n      \"method\": \"Receptor crosslinking assays, competitive binding assays, DNA synthesis measurement in HepG2 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding and functional assays with multiple readouts establishing dominant-negative mechanism\",\n      \"pmids\": [\"7890768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Inhibin's antagonism of activin-induced erythroid differentiation and receptor heteromerization is mediated through competition for the type II activin receptor (ActRII), and requires an additional inhibin-specific binding component beyond ActRII itself.\",\n      \"method\": \"Stable inducible cell lines overexpressing ActRII/ALK4; activin/inhibin treatment assays; hemoglobin accumulation and proliferation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — stable cell lines with defined receptor expression, multiple functional readouts, identifies requirement for co-receptor\",\n      \"pmids\": [\"9032295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Betaglycan (type III TGF-beta receptor) functions as a high-affinity co-receptor for inhibin (INHA-containing heterodimer) together with ActRII; betaglycan enhances inhibin binding to cells co-expressing ActRII, inhibin forms crosslinked complexes with both betaglycan and ActRII, and betaglycan confers inhibin responsiveness to cell lines otherwise insensitive to inhibin, enabling functional antagonism of activin signaling.\",\n      \"method\": \"Crosslinking assays, co-immunoprecipitation, binding studies in transfected cells, functional activin antagonism assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (crosslinking, co-IP, binding, functional assays) in single study; 478 citations\",\n      \"pmids\": [\"10746731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Three hydrophobic residues on ActRII (Phe42, Trp60, Phe83) form a critical binding surface required for functional interactions with both activin and inhibin (INHA-containing heterodimer); alanine substitution at each position disrupts inhibin binding, confirming that inhibin binds ActRII at the same interface as activin.\",\n      \"method\": \"Alanine scanning mutagenesis of ActRII extracellular domain, crosslinking binding assays, signaling assays in corticotroph cell lines\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis with multiple functional readouts defining the inhibin-binding surface on ActRII\",\n      \"pmids\": [\"10652306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The activin betaC subunit can dimerize with betaA and betaB subunits in vitro but cannot form a heterodimer with the inhibin alpha subunit (INHA), establishing that the alpha subunit has selective dimerization specificity restricted to beta A and beta B subunits.\",\n      \"method\": \"Mammalian cell co-expression and dimerization assays, immunolocalization\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — in vitro dimerization assay establishing subunit selectivity of INHA\",\n      \"pmids\": [\"11134153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In zebrafish, the inha (inhibin alpha subunit ortholog) is expressed exclusively in somatic follicle cells of the ovary (not in oocytes, pituitary, or brain); FSH (but not LH) significantly stimulates inha expression in cultured ovarian fragments; and human inhibin A inhibits oocyte maturation in vitro, suggesting a conserved negative feedback loop between pituitary FSH and ovarian inhibin.\",\n      \"method\": \"In situ hybridization, RT-PCR tissue expression profiling, recombinant FSH/LH treatment of cultured ovarian fragments, in vitro oocyte maturation assay\",\n      \"journal\": \"Reproduction (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple experimental approaches in zebrafish model establishing expression, regulation, and functional effect of inha ortholog\",\n      \"pmids\": [\"19602521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In Inha-null prepubertal mouse ovaries, GDF9 drives initial defects in preantral follicle growth; deletion of Gdf9 from Inha(-/-) mice rescues early follicle growth defects and reduces the activin/inhibin beta B subunit (Inhbb) upregulation seen in Inha(-/-) ovaries, but paradoxically accelerates pretumor lesion onset, establishing a sequential genetic epistasis where GDF9 promotes defective folliculogenesis and suppresses tumor initiation in the Inha-null context.\",\n      \"method\": \"Double knockout mouse genetics (Inha x Gdf9), histological follicle staging, immunohistochemistry, qRT-PCR\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double knockout genetic epistasis with multiple phenotypic readouts defining GDF9-INHA pathway interaction\",\n      \"pmids\": [\"23446452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss of inha (inhibin alpha) in zebrafish partially rescues the follicle development arrest and sex reversal caused by bmp15 deficiency; the bmp15/inha double mutant progresses to mid-vitellogenic follicle stage with yolk accumulation, and this rescue is dependent on increased inhbaa (activin betaAa) expression driving estradiol production, vitellogenin biosynthesis, and oocyte uptake via LRP receptors — establishing that INHA/inhibin restrains activin-mediated pathways that BMP15 normally promotes to sustain folliculogenesis.\",\n      \"method\": \"CRISPR/Cas9 knockouts (bmp15, inha, inhbaa single, double, and triple mutants), follicle staging, RNAseq transcriptome analysis, serum estradiol and vitellogenin measurements, aromatase inhibitor treatment, E2 rescue experiments\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — triple mutant genetic epistasis with transcriptomics, hormone measurements, and pharmacological rescue providing strong mechanistic evidence\",\n      \"pmids\": [\"37713421\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"INHA encodes the alpha subunit of inhibin, a disulfide-linked heterodimer (alpha:beta) that functions as a gonad-specific tumor suppressor and antagonist of activin signaling: inhibin binds ActRII (at residues Phe42, Trp60, Phe83) through its beta subunit in a complex facilitated by the co-receptor betaglycan, competitively blocking activin-induced recruitment of the type I receptor (ALK4) and downstream Smad signaling; in the gonad, INHA-containing inhibin restrains activin/GDF9-driven granulosa cell proliferation and folliculogenesis, with Inha-null mice universally developing gonadal stromal tumors, and zebrafish genetics revealing that inhibin suppresses activin betaAa-mediated estradiol production required for vitellogenin-dependent oocyte growth.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"INHA encodes the inhibin alpha subunit, which dimerizes with inhibin beta subunits to form inhibin, a TGF-β superfamily ligand that suppresses activin-driven signaling in ovarian follicle somatic cells and thereby regulates estradiol production, follicle development, and pituitary-gonadal feedback [PMID:19602521, PMID:37713421]. In the ovary, INHA expression is restricted to follicle cells and is stimulated by FSH; recombinant inhibin A inhibits oocyte maturation, consistent with a paracrine/endocrine negative feedback role [PMID:19602521]. Genetic epistasis studies demonstrate that inhibin alpha acts downstream of BMP15 to restrain activin (inhbaa)-dependent estradiol synthesis and vitellogenesis during folliculogenesis, and that in its absence, unrestrained GDF9 and activin signaling drives defective follicle growth and, in mice, granulosa cell tumor development [PMID:23446452, PMID:37713421].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing where and how inhibin alpha is regulated resolved the question of its tissue source and hormonal control in the pituitary-gonadal axis: inha is expressed exclusively in ovarian follicle cells (not oocytes or pituitary) and is FSH-responsive, and inhibin A directly inhibits oocyte maturation.\",\n      \"evidence\": \"In situ hybridization, FSH/LH stimulation of cultured zebrafish ovarian fragments, recombinant inhibin A oocyte maturation assay\",\n      \"pmids\": [\"19602521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Findings are from zebrafish; direct demonstration in mammalian ovarian follicles was not shown here\",\n        \"Receptor and downstream signaling mediating the oocyte maturation block were not identified\",\n        \"Endocrine feedback to the pituitary was inferred but not directly tested in vivo\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defining the epistatic relationship between inhibin alpha and GDF9 showed that INHA normally suppresses GDF9-driven granulosa cell proliferation and activin beta B upregulation, positioning inhibin alpha as a tumor suppressor in the ovary.\",\n      \"evidence\": \"Inha/Gdf9 double-knockout mice with folliculogenesis phenotyping and qRT-PCR for Inhbb\",\n      \"pmids\": [\"23446452\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether inhibin alpha directly antagonizes GDF9 signaling or acts through intermediate steps was not resolved\",\n        \"The mechanism by which loss of inhibin alpha transitions from folliculogenesis defects to tumor initiation was not delineated\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Multi-allele epistasis in zebrafish resolved the linear pathway order: BMP15 acts upstream of inhibin alpha, which suppresses activin (inhbaa)-dependent estradiol production and vitellogenesis, establishing inhibin alpha as a gatekeeper of activin signaling output during follicle progression.\",\n      \"evidence\": \"CRISPR/Cas9 single, double, and triple knockouts (bmp15, inha, inhbaa) with follicle staging, serum estradiol/vitellogenin measurement, transcriptomics, and aromatase inhibitor treatment in zebrafish\",\n      \"pmids\": [\"37713421\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The molecular mechanism by which BMP15 induces or regulates inha expression is unknown\",\n        \"Whether the same epistatic hierarchy operates in mammalian folliculogenesis has not been directly tested\",\n        \"The receptor complex through which inhibin alpha-containing dimers antagonize activin signaling in follicle cells was not identified\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The receptor-level mechanism by which inhibin dimers antagonize activin/BMP signaling in follicle cells, and the structural basis for inhibin alpha's tumor-suppressive function, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural model of inhibin alpha in complex with its cognate receptor or co-receptor exists in the timeline\",\n        \"Direct identification of inhibin-responsive transcriptional programs in granulosa cells is lacking\",\n        \"Conservation of the BMP15→INHA→activin epistatic hierarchy in mammals has not been demonstrated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"GDF9\",\n      \"INHBAA\",\n      \"INHBB\",\n      \"BMP15\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"INHA encodes the alpha subunit of inhibin, a disulfide-linked heterodimeric glycoprotein (inhibin A = α:βA; inhibin B = α:βB) that functions as a gonad-specific tumor suppressor and a competitive antagonist of activin signaling [PMID:3016724, PMID:3754442, PMID:1448148]. Inhibin binds the type II activin receptor (ActRII) via its beta subunit at a hydrophobic interface (Phe42, Trp60, Phe83) shared with activin, but fails to recruit the type I receptor ALK4, thereby acting as a dominant-negative blocker of activin-induced Smad signaling; high-affinity antagonism requires the co-receptor betaglycan [PMID:7890768, PMID:10652306, PMID:10746731]. Targeted deletion of Inha in mice causes fully penetrant gonadal stromal tumors, and genetic epistasis studies in mouse and zebrafish demonstrate that INHA-containing inhibin restrains activin/GDF9-driven granulosa cell proliferation, folliculogenesis, and estradiol-dependent oocyte growth [PMID:1448148, PMID:23446452, PMID:37713421].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Cloning and sequencing of the INHA gene and its two beta subunit partners established that inhibin is a heterodimeric glycoprotein (α:βA or α:βB) encoded by a single-copy gene on chromosome 2q, expressed specifically in the gonads under gonadotropin control.\",\n      \"evidence\": \"cDNA cloning from porcine ovary and human placenta, Northern blots, Southern blot analysis of somatic cell hybrids, in situ hybridization, genomic sequencing\",\n      \"pmids\": [\"3016724\", \"3754442\", \"2767687\", \"3758355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Post-translational processing steps of the alpha subunit precursor were not fully characterized\", \"Gonadal cell types producing INHA protein were not resolved at single-cell level\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Targeted deletion of the Inha gene demonstrated that the alpha subunit is an essential tumor suppressor, as Inha-null mice universally develop gonadal stromal tumors — the first genetic proof of a secreted hormone acting as a tumor suppressor.\",\n      \"evidence\": \"Homologous recombination knockout in mouse ES cells, histopathological analysis showing 100% penetrance of gonadal tumors\",\n      \"pmids\": [\"1448148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling events linking loss of inhibin to tumorigenesis were not defined\", \"Whether tumor suppression is cell-autonomous or paracrine was unresolved\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Biochemical dissection of inhibin's antagonism of activin revealed a dominant-negative mechanism: inhibin binds ActRII through its beta subunit but cannot recruit the type I receptor, blocking activin signaling complex formation.\",\n      \"evidence\": \"Receptor crosslinking, competitive binding assays, and DNA synthesis measurement in HepG2 cells\",\n      \"pmids\": [\"7890768\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The contribution of the alpha subunit to receptor binding was unclear\", \"Identity of the postulated inhibin-specific co-receptor remained unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of betaglycan as the inhibin co-receptor and mapping of the shared ActRII binding interface (Phe42, Trp60, Phe83) completed the model of inhibin's competitive antagonism, explaining how inhibin achieves high-affinity activin blockade in co-receptor-expressing tissues.\",\n      \"evidence\": \"Crosslinking, co-immunoprecipitation, transfection-based binding and functional assays (betaglycan); alanine scanning mutagenesis of ActRII extracellular domain with crosslinking and signaling assays\",\n      \"pmids\": [\"10746731\", \"10652306\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the ternary inhibin–betaglycan–ActRII complex was not determined at atomic resolution\", \"Whether betaglycan mediates inhibin tumor suppression in vivo was untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Genetic epistasis in Inha/Gdf9 double-knockout mice revealed that GDF9 drives the initial follicular growth defects in Inha-null ovaries but paradoxically suppresses tumor initiation, separating the folliculogenesis and tumor suppression functions of inhibin.\",\n      \"evidence\": \"Double knockout mouse genetics (Inha × Gdf9), histological follicle staging, immunohistochemistry, qRT-PCR\",\n      \"pmids\": [\"23446452\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type-specific signaling mediating GDF9's tumor-suppressive role in the Inha-null context was undefined\", \"Whether activin betaB upregulation is the proximate tumorigenic signal was not directly tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Triple-mutant zebrafish genetics demonstrated that loss of inha rescues bmp15-deficient follicle arrest through derepression of activin betaAa, which drives estradiol biosynthesis and vitellogenin-dependent oocyte growth — establishing that inhibin's core reproductive function is to restrain activin-mediated estradiol production.\",\n      \"evidence\": \"CRISPR/Cas9 single, double, and triple knockouts (bmp15, inha, inhbaa); RNAseq; serum estradiol and vitellogenin measurements; aromatase inhibitor treatment and E2 rescue\",\n      \"pmids\": [\"37713421\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this estradiol-mediated mechanism operates in mammalian granulosa cells remains untested\", \"The direct activin target genes mediating aromatase induction were not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"No high-resolution structure of the full inhibin heterodimer in complex with betaglycan and ActRII exists, and the mechanism by which loss of inhibin triggers stromal tumor initiation (as opposed to hyperplasia) has not been resolved at the signaling pathway level.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of the inhibin–betaglycan–ActRII ternary complex is lacking\", \"Cell-autonomous versus paracrine mechanisms of tumor suppression in the gonad remain undefined\", \"Whether INHA mutations contribute to human gonadal tumorigenesis is not established by direct genetic evidence\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [6, 7, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 7, 8, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 6, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0007165\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 7, 8, 9]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [12, 13]}\n    ],\n    \"complexes\": [\n      \"Inhibin A (alpha:betaA heterodimer)\",\n      \"Inhibin B (alpha:betaB heterodimer)\",\n      \"Inhibin–betaglycan–ActRII ternary complex\"\n    ],\n    \"partners\": [\n      \"INHBA\",\n      \"INHBB\",\n      \"ACVR2A\",\n      \"TGFBR3\",\n      \"GDF9\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}