{"gene":"GDF11","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2002,"finding":"Gdf11 signals through both activin type IIA (ActRIIA) and type IIB (ActRIIB) receptors to pattern axial vertebrae; biochemical studies showed Gdf11 binds both receptors and induces phosphorylation of Smad2. Genetic studies demonstrated ActRIIA and ActRIIB cooperatively mediate Gdf11 signaling, and each can compensate for the other.","method":"Genetic epistasis (double mutant mice), biochemical binding assays, Smad2 phosphorylation assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reciprocal genetic and biochemical validation, receptor binding and downstream signaling confirmed in same study","pmids":["12414726"],"is_preprint":false},{"year":2005,"finding":"GDF11 forms a noncovalent latent complex with its SPC-cleaved prodomain, and this latent complex is activated by cleavage at a single specific site by BMP1/Tolloid family metalloproteinases. Mutant GDF11 prodomains resistant to BMP1/Tolloid cleavage act as potent stimulators of neural differentiation.","method":"In vitro biochemical reconstitution, mutagenesis of protease cleavage site, cell differentiation assays (PC12 cells)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of latent complex, site-specific mutagenesis, and functional differentiation assay in single rigorous study","pmids":["15988002"],"is_preprint":false},{"year":2008,"finding":"The proprotein convertase PC5/6 (PCSK5) cleaves GDF11 at the RSRR↓N motif (P1' Asn determining selectivity) in vivo; PC5/6-deficient embryos display Gdf11-related phenotypes including altered anteroposterior patterning. In vitro and ex vivo analyses confirmed PC5/6 selectivity for GDF11.","method":"Conditional gene knockout, in vitro cleavage assays, ex vivo analysis, in situ hybridization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic loss-of-function with defined phenotype plus in vitro biochemical validation of cleavage site selectivity","pmids":["18378898"],"is_preprint":false},{"year":2003,"finding":"GDF11 mediates negative autoregulatory feedback inhibition of olfactory epithelium neurogenesis by inducing p27(Kip1) expression and reversible cell cycle arrest in neuronal progenitors. Mice lacking GDF11 have more progenitors and neurons; mice lacking follistatin (a GDF11 antagonist) show dramatically decreased neurogenesis.","method":"Mouse knockout, in vitro neurogenesis assays, p27Kip1 expression analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function mouse model with defined cellular phenotype plus identification of downstream effector (p27Kip1), replicated by follistatin knockout","pmids":["12546816"],"is_preprint":false},{"year":2001,"finding":"FGFs, Gdf11, and retinoid signals from Hensen's node and paraxial mesoderm converge to establish Hox-c positional identity of spinal motor neurons along the rostrocaudal axis of the developing spinal cord.","method":"In vitro patterning assay with chick embryos, Hox-c protein expression profiling, signal perturbation experiments","journal":"Neuron","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined epistatic pathway placement with expression profiling, single lab","pmids":["11754833"],"is_preprint":false},{"year":2006,"finding":"Ectopic Gdf11 expression in chick spinal cord causes rostral displacement of Hoxc protein expression domains and motor neuron column positions; follistatin (Gdf11 antagonist) has the converse effect. Gdf11 induces Smad2 phosphorylation, and activated Smad2 induces caudal Hox gene expression, establishing Gdf11→Smad2→Hox as the pathway for rostrocaudal identity in the spinal cord.","method":"In ovo electroporation, Gdf11 knockout mouse analysis, Smad2 phosphorylation assays","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function, loss-of-function, and biochemical signaling data in same study across two species","pmids":["16790475"],"is_preprint":false},{"year":2004,"finding":"GDF11 negatively regulates the number of NGN3+ islet progenitor cells in the pancreas and is required for beta-cell maturation. Mice deficient in Gdf11 have excess NGN3+ cells but reduced beta-cells. Similar phenotypes occur in mice deficient for SMAD2, placing GDF11-Smad2 signaling in the islet differentiation pathway parallel to Notch.","method":"Mouse knockout (Gdf11-null and Smad2-null), histological and molecular analysis of pancreatic development","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent genetic models (Gdf11-null and Smad2-null) with matching phenotypes establishing pathway position","pmids":["15548585"],"is_preprint":false},{"year":2005,"finding":"GDF11 controls the temporal window of Math5 expression in retinal progenitors, thereby determining the duration of competence for retinal ganglion cell (RGC) genesis. GDF11 acts not by affecting progenitor proliferation but by controlling the timing of Math5 expression.","method":"Mouse knockout, retinal cell counting, Math5 expression analysis","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with defined mechanism (Math5 expression timing) distinct from proliferation, replicated via multiple cell-type analysis","pmids":["15976303"],"is_preprint":false},{"year":2011,"finding":"In the olfactory epithelium, GDF11 inhibits proliferation and expansion of immediate neuronal precursors (INPs), while activin βB (ACTβB) inhibits expansion of stem/early progenitor cells by a distinct mechanism. Interplay between GDF11, ACTβB, and follistatin controls both total cell number and the ratio of neuronal vs. glial cells.","method":"Mouse genetics (Fst-/- and double mutants), cell-type-specific marker analysis, in vitro neurosphere assays","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — multi-mutant genetic analysis distinguishing GDF11 vs activin mechanisms with defined cellular readouts","pmids":["21852401"],"is_preprint":false},{"year":2011,"finding":"Gdf11 secreted by newly born neurons in the developing spinal cord facilitates temporal progression of neurogenesis by upregulating p57(Kip2) and p27(Kip1) and downregulating Pax6 in progenitors, promoting cell cycle exit and reducing proliferation potential.","method":"Gdf11-/- mouse analysis, neurosphere assays, in vitro Gdf11 addition, Western blot for cell cycle regulators","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo and in vitro convergence with identified molecular effectors (p57Kip2, p27Kip1, Pax6)","pmids":["21248112"],"is_preprint":false},{"year":2013,"finding":"GASP-1 and GASP-2 inhibit GDF11 (and myostatin) activity by blocking binding of the ligand to the type II receptor. Mice lacking Gasp2 show posterior transformations of the axial skeleton (opposite to Gdf11-/- anterior transformations), confirming GASP-2 as a GDF11 inhibitor in vivo.","method":"Biochemical receptor-binding blocking assays, genetic mouse models (Gasp1-/-, Gasp2-/-), skeletal phenotype analysis, muscle fiber-type assessment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical mechanism (receptor-binding block) confirmed by genetic epistasis in vivo","pmids":["24019467"],"is_preprint":false},{"year":2013,"finding":"Gdf11/Smad signaling directly activates the Hoxd11 axial expression enhancer via a conserved Smad3/4 binding element (region VIII). Chromatin immunoprecipitation demonstrated direct Smad2/3 protein binding to the Hoxd11 enhancer; mutation of the Smad binding motif abolishes Gdf11-induced reporter activity and is essential for axial Hoxd11 expression in the embryo tailbud.","method":"Reporter assays (luciferase, lacZ), mutagenesis of Smad-binding element, ChIP, SIS3 (Smad3 inhibitor) treatment, transgenic mouse experiments","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP for direct binding, mutagenesis of binding element, confirmed in transgenic embryos","pmids":["24016758"],"is_preprint":false},{"year":2009,"finding":"Foxg1 promotes olfactory neurogenesis by antagonizing Gdf11-mediated negative feedback. Foxg1 binds Smad transcriptional complexes and can bind Gdf11-related signaling; loss of one allele of Gdf11 substantially rescues neurogenesis defects in Foxg1-/- OE, demonstrating genetic epistasis.","method":"Genetic rescue experiments (Foxg1-/-;Gdf11-/- and Foxg1-/-;Gdf11+/- compound mutants), OE neurogenesis quantification, Fst expression analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — dose-dependent genetic rescue across multiple genotypes establishes pathway order","pmids":["19297409"],"is_preprint":false},{"year":2013,"finding":"GDF11 activates the canonical Smad2/3 signaling cascade in neural stem cells (Cor-1 line) via an ActRIIB/ALK5 receptor complex, significantly alters expression of ~4700 gene transcripts, suppresses cell proliferation by downregulating Cyclin D2, and inhibits migration by reducing Fascin and LASP1 expression.","method":"Receptor identification, Smad2/3 signaling assay, transcriptomic profiling, cell proliferation and scratch-wound migration assays, siRNA knockdown of EGF receptor","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (transcriptomics, proliferation, migration, signaling) in single lab","pmids":["24244313"],"is_preprint":false},{"year":2017,"finding":"Crystal structures of apo-GDF11, apo-GDF8, and the GDF11:FS288 complex revealed unique structural features in the type I receptor binding site of GDF11 that confer greater potency. GDF11 is a more potent activator of SMAD2/3 and signals more effectively through ALK4/5/7 than GDF8; substitution of GDF11 residues into GDF8 enhances GDF8 activity.","method":"X-ray crystallography, SMAD2/3 phosphorylation assays, mutagenesis (GDF11 residue substitution into GDF8), receptor binding assays","journal":"BMC biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures plus mutagenesis and functional signaling assays in same study","pmids":["28257634"],"is_preprint":false},{"year":2015,"finding":"GDF11 and myostatin both induce SMAD2/3 phosphorylation and inhibit myoblast differentiation, regulating identical downstream signaling. Using a GDF11-specific immunoassay (GDF11-specific reagents), GDF11 levels show a trend toward increase rather than decrease in aged rats and humans, and GDF11 significantly inhibited muscle regeneration and decreased satellite cell expansion in mice.","method":"GDF11-specific immunoassay development, SMAD2/3 phosphorylation assays, myoblast differentiation assays, in vivo muscle regeneration assays","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific validated immunoassay plus in vitro signaling and in vivo regeneration assays with defined phenotypic readout","pmids":["26001423"],"is_preprint":false},{"year":2017,"finding":"Supraphysiological systemic overexpression of GDF11 (via AAV) causes substantial atrophy of skeletal and cardiac muscle in mice through activation of p-SMAD2/3 and the ubiquitin-proteasome pathway. GDF11 and myostatin activate p-SMAD2/3 with similar potency and induce comparable myotube atrophy in vitro. Greater cardiac expression of TGFβR1 may explain GDF11-specific cardiac phenotype.","method":"AAV-mediated systemic overexpression, in vitro myoblast culture assays, p-SMAD2/3 measurement, muscle mass and function measurement","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo AAV overexpression with quantified muscle atrophy plus in vitro signaling, multiple orthogonal readouts","pmids":["28270449"],"is_preprint":false},{"year":2017,"finding":"PCSK5 (proprotein convertase subtilisin/kexin type 5) is required for GDF11 processing and bioactivation in triple-negative breast cancer (TNBC) cells. PCSK5 deficiency causes inactive GDF11 precursor to accumulate intracellularly. PCSK5 reconstitution mobilizes this latent GDF11 reservoir and suppresses TNBC metastasis, establishing GDF11 as a tumor suppressor inactivated by precursor sequestration.","method":"PCSK5 reconstitution in TNBC cells, 3D culture invasion assays, intraductal xenograft model, Western blot for GDF11 precursor vs. mature forms, lung metastasis quantification","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanism established by rescue (PCSK5 reconstitution), in vitro and in vivo validation, functional consequence defined","pmids":["29161592"],"is_preprint":false},{"year":2016,"finding":"GDF11 inhibits bone formation by inducing SMAD2/3 phosphorylation, which represses Runx2 expression in bone marrow mesenchymal stem cells, inhibiting osteoblastic differentiation in vitro and accelerating age-related bone loss in vivo. GDF11 had no effect on osteoclast differentiation or bone resorption.","method":"In vitro osteoblast differentiation assays, SMAD2/3 phosphorylation assays, Runx2 expression analysis, intraperitoneal GDF11 injection in mice, bone histomorphometry","journal":"Calcified tissue international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro mechanistic pathway plus in vivo validation, single lab","pmids":["27395058"],"is_preprint":false},{"year":2020,"finding":"Gdf11 null mice exhibit reduced bone mass through impaired osteoblast and chondrocyte maturation and increased osteoclastogenesis, while Mstn null mice display the opposite (enhanced bone mass). Mechanistically, Mstn deletion upregulates Gdf11 expression, which activates BMP signaling to enhance osteogenesis, establishing GDF11 as a pro-osteogenic factor opposing MSTN.","method":"Gdf11-/- and Mstn-/- genetic mouse models, bone mass measurement, osteoblast/chondrocyte differentiation assays, BMP signaling analysis, FST-overexpressing mouse analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models with reciprocal phenotypes and defined signaling pathway","pmids":["32071240"],"is_preprint":false},{"year":2017,"finding":"GDF11 secreted from the posterior axial mesoderm integrates sacral vertebrae and hindlimb positioning by inducing Hox gene expression in two different primordia (somites and lateral plate mesoderm). Manipulating the onset of GDF11 activity in chicken embryos altered hindlimb position; comparative analysis showed that heterochronic shifts in Gdf11 expression onset correlate with evolutionary diversity of hindlimb positioning.","method":"Manipulation of GDF11 activity onset in chick embryos, comparative embryo analysis, Hox gene expression assays","journal":"Nature ecology & evolution","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function manipulation in chick with defined Hox/positional readout, single lab","pmids":["29046533"],"is_preprint":false},{"year":2018,"finding":"GDF11 modulates intracellular Ca2+ signaling via the IP3 pathway in neonatal cardiomyocytes, and this Ca2+ response is required for GDF11-induced Smad2/3 phosphorylation and transcriptional activity. Blocking IP3-dependent Ca2+ release abolishes GDF11-induced Smad2/3 activity. siRNA knockdown of Smad2 and Smad3 inhibits the antihypertrophic effects of GDF11.","method":"Intracellular Ca2+ imaging, IP3 pathway inhibitors, BAPTA-AM Ca2+ chelation, Smad2/3 luciferase reporter, siRNA knockdown, cardiomyocyte hypertrophy assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal pharmacological and genetic tools in single lab with defined mechanistic pathway","pmids":["29783655"],"is_preprint":false},{"year":2016,"finding":"GDF11 activates both Smad1/5/8 and Smad2/3 signaling pathways in human umbilical vein endothelial cells (HUVECs), and increases NADPH oxidase 4 (NOX4) protein expression and p-JNK and p-AMPK levels. GDF11 showed no significant effect on p38, ERK, or Akt signaling, and had no significant effect on HUVEC proliferation or migration.","method":"Western blot for phospho-signaling proteins, MTT cell viability assay, wound healing migration assay","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple signaling readouts in single lab but limited mechanistic depth; dual-pathway activation is the key finding","pmids":["26919250"],"is_preprint":false},{"year":2019,"finding":"GDF11 induces SMAD2/3 phosphorylation and nuclear translocation via ALK5 in hepatocellular carcinoma (HCC) cells but not in primary hepatocytes. ALK5 inhibition blocks GDF11-mediated SMAD2/3 signaling and attenuates lipid accumulation in HCC cells. Transcriptomics identified TGF-β and PI3K-AKT signaling as top pathways activated.","method":"Western blot for SMAD2/3 nuclear translocation, ALK5 inhibitor (SB431542), lipidomics, transcriptomics (RNA-seq), primary hepatocyte vs. HCC cell comparison","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibitor plus transcriptomics plus lipidomics, single lab","pmids":["33684566"],"is_preprint":false},{"year":2019,"finding":"GDF11 inhibits hepatic hepcidin (HAMP) expression by decreasing BMP-SMAD signaling through enhancement of SMURF1-mediated ubiquitination and by activating ERK1/2 (MAPK3/1) signaling. ERK1/2 activation is required for GDF11- or SMURF1-mediated suppression of BMP-SMAD and HAMP expression.","method":"In vivo GDF11 administration, in vitro hepatocyte treatment, Western blot for BMP-SMAD and ERK signaling, SMURF1 expression assays","journal":"British journal of haematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro signaling pathway dissection with pathway inhibitors, single lab","pmids":["31418854"],"is_preprint":false},{"year":2019,"finding":"Crystal structure of the WFIKKN2 follistatin domain (FSD) revealed that WFIKKN2 FSD binds both GDF8 and GDF11 and blocks their interaction with the type II receptor ActRIIB. Surface-exposed residues important for antagonism were identified by alanine scanning mutagenesis. The WFIKKN2 FSD uses different residues than follistatin or FSTL3 for ligand antagonism.","method":"Crystal structure determination (1.39 Å), native gel shift assay, surface plasmon resonance, alanine scanning mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with SPR binding assays and mutagenesis in same study","pmids":["30814254"],"is_preprint":false},{"year":2009,"finding":"BMP-11/GDF11 and myostatin maintain human embryonic stem cell (hESC) self-renewal under feeder-free conditions by activating SMAD2/3 phosphorylation through type I TGF-β receptors (ALK4/5/7). The type I TGF-β receptor inhibitor SB431542 completely blocked this maintenance activity.","method":"hESC culture assays, SMAD2/3 phosphorylation measurement, pharmacological inhibition (SB431542), pluripotency marker analysis","journal":"Cloning and stem cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological receptor inhibition plus marker analysis, single lab","pmids":["19751112"],"is_preprint":false},{"year":2019,"finding":"GDF11 promotes human extravillous trophoblast (EVT) cell invasion by stimulating MMP2 expression via ALK4/5-SMAD2/3 signaling, which upregulates inhibitor of DNA-binding protein 2 (ID2), required for GDF11-stimulated MMP2 expression and invasion.","method":"siRNA knockdown of ALK4/5 and ID2, pharmacological inhibitors, Matrigel transwell invasion assay, Western blot","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological dissection of pathway (ALK4/5→SMAD2/3→ID2→MMP2) in vitro, single lab","pmids":["35705978"],"is_preprint":false},{"year":2020,"finding":"GDF11 inhibits adipogenesis in pre-adipocytes via ALK5-SMAD2/3 activation in cooperation with the WNT/β-catenin pathway. WNT/β-catenin pathway inhibition results in adipogenic differentiation despite GDF11. GDF11 also increases adiponectin secretion and glucose uptake in mature adipocytes.","method":"ALK5 inhibitor, WNT pathway inhibitor, adipogenesis assays, glucose uptake assays, transcriptomics, ob/ob mouse in vivo experiments","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological pathway dissection plus in vivo validation, single lab","pmids":["35920128"],"is_preprint":false},{"year":2019,"finding":"A loss-of-function GDF11 variant (p.Arg298Gln) at the Furin protease cleavage site was identified in a human family with cleft lip/palate and vertebral/rib abnormalities mirroring Gdf11 knockout mice. Functional assays demonstrated that this substitution significantly impairs GDF11 function, confirming GDF11 processing at the furin cleavage site is essential for human development.","method":"Exome sequencing, functional assays of mutant GDF11, zebrafish gdf11 loss-of-function model","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human variant with functional validation in assays and model organism","pmids":["31215115"],"is_preprint":false},{"year":2022,"finding":"Pathophysiological levels of GDF11 activate Smad2/3 signaling in human iPSC-derived myocytes and induce muscle atrophy by upregulating the E3 ubiquitin ligase Atrogin-1 via FOXO1. FOXO1 blockade reverses GDF11-induced Atrogin-1 expression and atrophic phenotype, establishing a GDF11→Smad2/3→FOXO1→Atrogin-1 axis for muscle atrophy.","method":"Human iPSC-derived myocytes, Smad2/3 phosphorylation assays, FOXO1 inhibition, Atrogin-1 expression analysis, myocyte diameter measurement","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibitor rescue plus defined molecular pathway, human cell model, single lab","pmids":["36094432"],"is_preprint":false},{"year":2020,"finding":"GDF11 enhances mesenchymal stem cell (MSC) viability under hypoxia by activating TGF-β receptor/Smad2/3 signaling, which upregulates the mitochondrial protease YME1L. YME1L in turn promotes OPA1 processing, preserving mitochondrial fusion morphology. TGF-β receptor inhibitor (SB431542) or Smad2/3 inhibitor (SIS3) blocked these effects.","method":"Lentiviral GDF11 overexpression, pharmacological inhibitors of TGF-β receptor and Smad2/3, Western blot for YME1L and OPA1, mitochondrial morphology imaging, cardiac MSC transplantation","journal":"Stem cells translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection of signaling chain (receptor→Smad2/3→YME1L→OPA1), single lab","pmids":["32515551"],"is_preprint":false},{"year":2001,"finding":"In chick limb, GDF11 negatively regulates both chondrogenesis and myogenesis; GDF11-soaked beads implanted into wing buds cause limb truncations and inhibit both cartilage and muscle. In vitro micromass assays confirmed inhibition of chondrogenic and myogenic differentiation. GDF11 also induces ectopic expression of Hoxd-11 and Hoxd-13, and induces expression of its own antagonist follistatin.","method":"Bead implantation in chick embryo wing buds, in vitro micromass differentiation assays, Hox gene expression analysis, follistatin expression assay","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo bead implantation plus in vitro micromass assay, single lab, avian model","pmids":["11203700"],"is_preprint":false},{"year":2002,"finding":"Recombinant GDF11 induces expression of dentin sialoprotein (Dsp), an odontoblast differentiation marker, in mouse dental papilla mesenchyme in organ culture. In vivo electroporation-mediated Gdf11 gene transfer stimulated reparative dentin formation during pulpal wound healing in canine teeth.","method":"Organ culture differentiation assay, electroporation-mediated gene transfer, in vivo gene delivery in dog dental pulp","journal":"Gene therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro differentiation assay plus in vivo gene transfer with functional readout, single lab","pmids":["12040463"],"is_preprint":false},{"year":2019,"finding":"GDF11 induces differentiation and apoptosis and suppresses migration of C17.2 neural stem cells. Phospho-proteomic profiling showed GDF11 significantly increases phosphorylation of p38, ERK, and Akt (MAPK pathway activation) in these cells.","method":"Phospho-proteome profiling array, Western blot validation, differentiation assays, apoptosis assays, migration assay","journal":"PeerJ","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — phospho-proteomics validated by Western blot, multiple cellular readouts, single lab","pmids":["30202652"],"is_preprint":false},{"year":2019,"finding":"GDF11 promotes the Smad2/3 signaling pathway to upregulate HOXA3, which acts as a transcriptional repressor of NLRP3 inflammasome expression (confirmed by ChIP assay), thereby inhibiting cardiomyocyte pyroptosis in myocardial infarction.","method":"AAV9-GDF11 overexpression in MI mice, PROMO/JASPAR prediction and ChIP assay for HOXA3 binding to NLRP3 promoter, Western blot for Smad2/3 pathway","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP assay for direct HOXA3-NLRP3 interaction plus in vivo overexpression, single lab","pmids":["33100331"],"is_preprint":false},{"year":2021,"finding":"Endogenous GDF11 in the adult brain is most highly expressed in neurogenic niches. Inducible conditional knockout of Gdf11 during adulthood increased proliferation of neural progenitors but decreased newborn neurons in the hippocampus, confirming that endogenous GDF11 remains a negative regulator of adult hippocampal neurogenesis.","method":"Tamoxifen-inducible conditional knockout mouse, immunohistochemistry, neural progenitor proliferation and newborn neuron quantification","journal":"Molecular brain","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible conditional knockout with defined neurogenesis phenotype, replicates developmental findings in adult context","pmids":["34488822"],"is_preprint":false},{"year":2019,"finding":"GDF11 treatment of GDF11-null kidney fibroblasts (NRK49f) induced their proliferation and activation, and promoted epithelial-to-mesenchymal transition (EMT) of renal tubular epithelial cells (IMCD-3) in a SMAD3-dependent manner. Systemic high-dose GDF11 in adult mice caused renal fibrosis and failure associated with SMAD2 phosphorylation, which was blocked by follistatin.","method":"In vitro renal cell line assays, SMAD3-dependence assays (pharmacological), in vivo GDF11 injection with follistatin rescue, 5/6 nephrectomy model","journal":"Surgery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro mechanistic pathway (SMAD3-dependent EMT) plus in vivo validation with follistatin rescue, single lab","pmids":["29731246"],"is_preprint":false},{"year":2019,"finding":"GDF11 activates TGF-β/Smad2/3 and PI3K-AKT-FoxO1 signaling pathways in pancreatic beta-cells and adipose tissue to protect beta-cell function and survival. Anti-GDF11 monoclonal antibody treatment caused beta-cell failure, establishing an endogenous requirement for GDF11 signaling in beta-cell maintenance.","method":"Recombinant GDF11 supplementation, anti-GDF11 antibody neutralization, in vitro islet and MIN6 cell assays, signaling pathway analysis","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function and loss-of-function (antibody) with signaling pathway identification, single lab","pmids":["28450417"],"is_preprint":false},{"year":2021,"finding":"Endogenous GDF11 expressed in adult rat CNS is found in most neurons and their axons, as well as in astrocytes and ependymal cells, demonstrating widespread expression throughout the adult brain.","method":"Immunohistochemistry in adult rat CNS sections","journal":"Journal of chemical neuroanatomy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by IHC without functional consequence in same study","pmids":["29448002"],"is_preprint":false},{"year":2023,"finding":"Systemic recombinant GDF11 delivery prior to myocardial ischemia-reperfusion in mice augmented infarct size by accelerating pro-apoptotic signaling. Targeted transcriptomics revealed attenuated Nkx2-5 expression in CD105+ cells with adjacent pro-apoptotic caspase-3 activity, suggesting an indirect apoptotic effect. In humans, circulating GDF11 levels increase with age and predict larger infarct size independently.","method":"Recombinant GDF11 delivery in mice, ischemia-reperfusion model, targeted transcriptomics, immunomapping, validated LC-MS/MS GDF11 assay in human MI patients","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model with mechanistic transcriptomic analysis plus validated human mass spectrometry assay, single lab","pmids":["37742057"],"is_preprint":false}],"current_model":"GDF11 is a secreted TGF-β superfamily ligand that is synthesized as a latent precursor requiring proteolytic activation: proprotein convertases (PC5/6 and furin-site convertases) perform an initial cleavage, and BMP1/Tolloid metalloproteinases then cleave the prodomain to release active ligand; active GDF11 binds type II receptors ActRIIA and ActRIIB (with higher potency than GDF8/myostatin), recruits type I receptors ALK4/5/7, and activates Smad2/3 (and to a lesser extent Smad1/5/8) signaling to regulate diverse developmental and adult tissue processes including rostrocaudal Hox gene patterning (via direct Smad3 binding to Hox enhancers), negative feedback control of neurogenesis (inducing p27Kip1/p57Kip2 and cell cycle exit), retinal progenitor competence timing (via Math5 expression window control), pancreatic islet progenitor number and beta-cell maturation, osteoblast differentiation (repressing Runx2 via Smad2/3), and skeletal muscle mass regulation (inducing Atrogin-1 via FOXO1); its activity is antagonized extracellularly by follistatin, GASP-1, GASP-2, and WFIKKN2, all of which block type II receptor binding."},"narrative":{"mechanistic_narrative":"GDF11 is a secreted TGF-β superfamily ligand that signals through activin type II receptors (ActRIIA and ActRIIB) and type I receptors (ALK4/5/7) to activate canonical SMAD2/3 phosphorylation, controlling rostrocaudal axial patterning, progenitor cell-cycle exit, and adult tissue homeostasis across multiple organs [PMID:12414726, PMID:16790475, PMID:28257634]. It is produced as a latent precursor activated by ordered proteolysis: proprotein convertases including PC5/6 (PCSK5) cleave the RSRR↓N motif, and BMP1/Tolloid metalloproteinases subsequently cleave the noncovalent prodomain complex to release active ligand [PMID:15988002, PMID:18378898]. In developmental patterning, GDF11 signaling drives caudal Hox gene expression through direct SMAD2/3 binding to axial Hox enhancers (e.g., the Hoxd11 region VIII Smad3/4 element), positioning vertebrae, hindlimbs, and spinal motor neuron columns [PMID:16790475, PMID:24016758, PMID:29046533]. As a negative-feedback regulator of neurogenesis, GDF11 induces p27Kip1 and p57Kip2 to enforce reversible cell-cycle arrest in neuronal progenitors, limiting their number in both embryonic and adult neurogenic niches; it likewise restrains pancreatic NGN3+ islet progenitor expansion while promoting beta-cell maturation [PMID:12546816, PMID:21248112, PMID:34488822, PMID:15548585]. In adult tissues GDF11 acts through SMAD2/3 to repress Runx2 and osteoblast differentiation, and to induce skeletal and cardiac muscle atrophy via a SMAD2/3→FOXO1→Atrogin-1 axis engaging the ubiquitin-proteasome pathway [PMID:27395058, PMID:28270449, PMID:36094432]. Extracellularly its activity is blocked by antagonists including GASP-1, GASP-2, and the WFIKKN2 follistatin domain, which prevent type II receptor binding [PMID:24019467, PMID:30814254]. A loss-of-function variant at the furin cleavage site (p.Arg298Gln) causes a human syndrome of cleft lip/palate and vertebral/rib anomalies mirroring Gdf11-null mice, establishing GDF11 processing as essential for human development [PMID:31215115].","teleology":[{"year":2001,"claim":"Established GDF11 as a diffusible morphogen that negatively regulates differentiation and induces Hox gene expression, defining its role in axial and limb patterning.","evidence":"Bead implantation and micromass assays in chick wing buds with Hox and follistatin expression readouts","pmids":["11203700","11754833"],"confidence":"Medium","gaps":["Receptor identity and intracellular transducer not defined in these early studies","Avian gain-of-function only; endogenous requirement not tested"]},{"year":2002,"claim":"Identified the receptor system, showing GDF11 binds ActRIIA and ActRIIB and induces Smad2 phosphorylation to pattern axial vertebrae, anchoring the signaling pathway in vivo.","evidence":"Double-mutant mouse genetics, biochemical receptor binding, and Smad2 phosphorylation assays","pmids":["12414726"],"confidence":"High","gaps":["Type I receptor partner not resolved in this study","Direct transcriptional targets downstream of Smad2 not identified"]},{"year":2003,"claim":"Defined GDF11 as a negative-feedback regulator of neurogenesis acting through p27Kip1-mediated cell-cycle arrest, explaining how progenitor numbers are autoregulated.","evidence":"Gdf11 and follistatin knockout mice with in vitro neurogenesis and p27Kip1 expression analysis","pmids":["12546816"],"confidence":"High","gaps":["How GDF11 levels are sensed to set the feedback threshold not defined","Receptor complex in olfactory progenitors not specified"]},{"year":2005,"claim":"Resolved the activation mechanism: GDF11 is held latent by its SPC-cleaved prodomain and liberated by BMP1/Tolloid cleavage, identifying a key control point on ligand bioavailability.","evidence":"In vitro reconstitution of the latent complex, cleavage-site mutagenesis, and PC12 differentiation assays","pmids":["15988002"],"confidence":"High","gaps":["In vivo contribution of BMP1/Tolloid versus other proteases not quantified","Spatial regulation of activation in tissues not addressed"]},{"year":2005,"claim":"Showed GDF11 controls competence timing rather than proliferation, setting the Math5 expression window that limits retinal ganglion cell genesis — distinguishing a timing mechanism from a proliferative one.","evidence":"Gdf11 knockout mice with retinal cell counting and Math5 expression analysis","pmids":["15976303"],"confidence":"High","gaps":["Molecular link between Smad signaling and Math5 regulation not defined","Mechanism distinguishing competence from proliferation control unclear"]},{"year":2006,"claim":"Established the Gdf11→Smad2→caudal Hox pathway for rostrocaudal spinal identity by gain- and loss-of-function across species, formalizing the signaling logic of axial patterning.","evidence":"In ovo electroporation, Gdf11 knockout analysis, and Smad2 phosphorylation assays","pmids":["16790475"],"confidence":"High","gaps":["Whether Smad2 acts directly at Hox enhancers not yet shown (later addressed in 2013)","Cofactors conferring caudal specificity unknown"]},{"year":2004,"claim":"Placed GDF11-Smad2 signaling in pancreatic islet differentiation, showing it restrains NGN3+ progenitor number and is required for beta-cell maturation.","evidence":"Gdf11-null and Smad2-null mouse models with histological and molecular analysis of pancreas","pmids":["15548585"],"confidence":"High","gaps":["Relationship to Notch signaling defined only as parallel, not mechanistically integrated","Direct transcriptional targets in islet progenitors not identified"]},{"year":2008,"claim":"Identified PC5/6 as the proprotein convertase cleaving GDF11 at RSRR↓N in vivo, defining selectivity determinants of the first activating cleavage.","evidence":"Conditional knockout, in vitro cleavage assays, and in situ hybridization","pmids":["18378898"],"confidence":"High","gaps":["Redundancy with furin and other convertases not fully resolved","Tissue-specific convertase usage not mapped"]},{"year":2011,"claim":"Refined the neurogenic feedback model by distinguishing GDF11 (inhibits immediate neuronal precursors) from activin βB (inhibits stem/early progenitors) and identifying additional effectors p57Kip2 and Pax6.","evidence":"Multi-mutant mouse genetics, neurosphere assays, and Western blots for cell-cycle regulators","pmids":["21852401","21248112"],"confidence":"High","gaps":["How distinct progenitor populations respond differentially to related ligands unclear","Receptor-level basis for GDF11 versus activin specificity not defined"]},{"year":2009,"claim":"Demonstrated GDF11 maintains hESC self-renewal through type I TGF-β receptor (ALK4/5/7)–dependent SMAD2/3 activation and revealed Foxg1 antagonizes GDF11 feedback in neurogenesis via genetic epistasis.","evidence":"hESC culture with SB431542 inhibition and compound-mutant genetic rescue in mouse olfactory epithelium","pmids":["19751112","19297409"],"confidence":"Medium","gaps":["Direct Foxg1–Smad biochemical interaction not fully resolved","hESC pluripotency role uses pharmacology that does not isolate GDF11 from related ligands"]},{"year":2013,"claim":"Provided direct molecular evidence that Smad2/3 binds axial Hox enhancers and identified GASP-2 as an in vivo GDF11 antagonist acting by blocking type II receptor binding.","evidence":"ChIP, enhancer mutagenesis, transgenic embryos, plus receptor-binding blocking assays and Gasp1/Gasp2 knockout skeletal phenotyping","pmids":["24016758","24019467"],"confidence":"High","gaps":["Full repertoire of direct Smad-bound Hox enhancers not mapped","GASP antagonist tissue specificity and relative potency versus follistatin not defined"]},{"year":2015,"claim":"Using a GDF11-specific immunoassay, showed GDF11 and myostatin share identical SMAD2/3-mediated inhibition of myoblast differentiation and that GDF11 inhibits muscle regeneration, reframing GDF11 as a potential negative regulator of muscle.","evidence":"Validated GDF11-specific immunoassay, SMAD2/3 phosphorylation, myoblast differentiation, and in vivo regeneration assays","pmids":["26001423"],"confidence":"High","gaps":["Molecular features distinguishing GDF11 from myostatin in muscle not resolved here","Endogenous circulating GDF11 dynamics across age debated"]},{"year":2016,"claim":"Extended GDF11's catabolic role to bone, showing SMAD2/3-mediated Runx2 repression inhibits osteoblast differentiation and accelerates age-related bone loss.","evidence":"In vitro osteoblast differentiation, Runx2 analysis, and in vivo GDF11 injection with bone histomorphometry","pmids":["27395058"],"confidence":"Medium","gaps":["Reconciliation with later genetic evidence of a pro-osteogenic role not addressed","Dose dependence of bone effects not delineated"]},{"year":2017,"claim":"Crystal structures explained GDF11's greater potency over GDF8 via type I receptor binding-site features and confirmed supraphysiological GDF11 drives skeletal and cardiac atrophy through SMAD2/3 and the ubiquitin-proteasome pathway.","evidence":"X-ray crystallography with mutagenesis and signaling assays; AAV-mediated systemic overexpression with muscle mass measurement","pmids":["28257634","28270449"],"confidence":"High","gaps":["Physiological versus supraphysiological dose effects remain a central ambiguity","Cardiac specificity attributed to TGFβR1 expression not mechanistically proven"]},{"year":2017,"claim":"Defined a tumor-suppressive mechanism in which PCSK5 mobilizes a sequestered latent GDF11 reservoir to suppress breast cancer metastasis, linking convertase processing to disease.","evidence":"PCSK5 reconstitution in TNBC cells, invasion assays, intraductal xenografts, and precursor/mature GDF11 Western blots","pmids":["29161592"],"confidence":"High","gaps":["Generality of precursor sequestration across cancer types unknown","Receptor and transcriptional output mediating metastasis suppression not detailed"]},{"year":2019,"claim":"Established a human Mendelian link: a furin-site GDF11 variant (p.Arg298Gln) impairs processing and causes craniofacial and axial skeletal anomalies, and structural work defined how WFIKKN2 antagonizes GDF11.","evidence":"Exome sequencing with functional assays and zebrafish model; WFIKKN2 follistatin-domain crystal structure with SPR and alanine scanning","pmids":["31215115","30814254"],"confidence":"Medium","gaps":["Full phenotypic spectrum of GDF11 variants in humans not catalogued","Relative in vivo contribution of WFIKKN2 versus other antagonists unquantified"]},{"year":2019,"claim":"Broadened GDF11 context-dependent signaling beyond canonical SMAD2/3, documenting ALK5-dependent effects in hepatocellular carcinoma lipid handling, ERK/SMURF1-mediated hepcidin suppression, and ID2→MMP2-driven trophoblast invasion.","evidence":"ALK5 inhibitor (SB431542), transcriptomics/lipidomics, SMURF1 and ERK pathway analysis, and siRNA invasion assays across hepatocyte, hepatic, and trophoblast systems","pmids":["33684566","31418854","35705978"],"confidence":"Medium","gaps":["Cell-type determinants of divergent (SMAD versus ERK/PI3K) output not defined","Most effects shown in single-lab cell models without genetic confirmation"]},{"year":2020,"claim":"Genetic models complicated the bone story, showing Gdf11-null mice have reduced bone mass via BMP signaling and opposing myostatin, establishing GDF11 as pro-osteogenic and revealing antagonist-dependent context.","evidence":"Gdf11-/- and Mstn-/- mouse models with bone mass measurement, differentiation assays, and BMP signaling analysis","pmids":["32071240"],"confidence":"High","gaps":["Mechanistic reconciliation with SMAD2/3-mediated Runx2 repression in osteoblasts not achieved","Conditions favoring SMAD2/3 versus BMP output in bone unclear"]},{"year":2022,"claim":"Resolved the muscle-atrophy mechanism in human cells as a SMAD2/3→FOXO1→Atrogin-1 axis, providing a defined transcriptional route from ligand to proteolytic atrophy.","evidence":"Human iPSC-derived myocytes with FOXO1 inhibition, SMAD2/3 phosphorylation, and Atrogin-1 expression analysis","pmids":["36094432"],"confidence":"Medium","gaps":["Whether this axis operates at physiological GDF11 levels in vivo not established","Single human cell model, no in vivo genetic confirmation"]},{"year":2021,"claim":"Inducible adult conditional knockout confirmed endogenous GDF11 remains a negative regulator of adult hippocampal neurogenesis, extending the developmental feedback role into adulthood.","evidence":"Tamoxifen-inducible Gdf11 conditional knockout with progenitor proliferation and newborn neuron quantification","pmids":["34488822"],"confidence":"High","gaps":["Receptor and effector identity in adult niche not specified","Functional/behavioral consequences not assessed"]},{"year":2023,"claim":"Characterized GDF11's cardiac injury context, showing systemic GDF11 augments infarct size via pro-apoptotic signaling and correlates with age-associated circulating levels in human MI patients.","evidence":"Recombinant GDF11 delivery in ischemia-reperfusion mice, targeted transcriptomics, and validated LC-MS/MS GDF11 assay in patients","pmids":["37742057"],"confidence":"Medium","gaps":["Direct versus indirect apoptotic mechanism not fully separated","Causality of human circulating GDF11 versus correlation not established"]},{"year":null,"claim":"It remains unresolved how a single ligand produces opposite tissue outcomes (e.g., catabolic versus pro-osteogenic bone effects, beneficial versus harmful cardiac effects) and what determines the choice between SMAD2/3, SMAD1/5/8, and non-canonical (ERK/PI3K/Ca2+) outputs at physiological doses.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model reconciling dose-, receptor-, and context-dependent signaling outputs","Physiological versus supraphysiological effect thresholds not defined across tissues","Antagonist-dependent switching of downstream pathway output not mechanistically mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,5,14]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,13,26]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,8]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[1,17]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,14]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,6,7,11,20]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,2,16,30]}],"complexes":[],"partners":["ACVR2A","ACVR2B","ACVR1B","TGFBR1","FST","WFIKKN2","PCSK5","BMP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95390","full_name":"Growth/differentiation factor 11","aliases":["Bone morphogenetic protein 11","BMP-11"],"length_aa":407,"mass_kda":45.1,"function":"Secreted signal that acts globally to regulate anterior/posterior axial patterning during development. May play critical roles in patterning both mesodermal and neural tissues (By similarity). It is required for proper vertebral patterning and orofacial development (PubMed:31215115). Signals through activin receptors type-2, ACVR2A and ACVR2B, and activin receptors type-1, ACVR1B, ACVR1C and TGFBR1 leading to the phosphorylation of SMAD2 and SMAD3 (PubMed:28257634)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/O95390/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GDF11","classification":"Not Classified","n_dependent_lines":12,"n_total_lines":1208,"dependency_fraction":0.009933774834437087},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GDF11","total_profiled":1310},"omim":[{"mim_id":"619122","title":"VERTEBRAL HYPERSEGMENTATION AND OROFACIAL ANOMALIES; VHO","url":"https://www.omim.org/entry/619122"},{"mim_id":"611543","title":"CAVITARY OPTIC DISC ANOMALIES; CODA","url":"https://www.omim.org/entry/611543"},{"mim_id":"610895","title":"WAP, FOLLISTATIN, IMMUNOGLOBULIN, KUNITZ, AND NTR DOMAINS-CONTAINING PROTEIN 2; WFIKKN2","url":"https://www.omim.org/entry/610895"},{"mim_id":"608021","title":"WAP, FOLLISTATIN, IMMUNOGLOBULIN, KUNITZ, AND NTR DOMAINS-CONTAINING PROTEIN 1; WFIKKN1","url":"https://www.omim.org/entry/608021"},{"mim_id":"607830","title":"FRASER EXTRACELLULAR MATRIX COMPLEX SUBUNIT 1; FRAS1","url":"https://www.omim.org/entry/607830"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"retina","ntpm":20.0}],"url":"https://www.proteinatlas.org/search/GDF11"},"hgnc":{"alias_symbol":["BMP-11","BMP11"],"prev_symbol":[]},"alphafold":{"accession":"O95390","domains":[{"cath_id":"2.10.90.10","chopping":"63-122_296-405","consensus_level":"high","plddt":82.5023,"start":63,"end":405},{"cath_id":"2.60.120.970","chopping":"140-203_218-289","consensus_level":"high","plddt":88.8085,"start":140,"end":289}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95390","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95390-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95390-F1-predicted_aligned_error_v6.png","plddt_mean":73.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GDF11","jax_strain_url":"https://www.jax.org/strain/search?query=GDF11"},"sequence":{"accession":"O95390","fasta_url":"https://rest.uniprot.org/uniprotkb/O95390.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95390/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95390"}},"corpus_meta":[{"pmid":"24797481","id":"PMC_24797481","title":"Restoring systemic GDF11 levels reverses age-related dysfunction in mouse skeletal muscle.","date":"2014","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/24797481","citation_count":677,"is_preprint":false},{"pmid":"26001423","id":"PMC_26001423","title":"GDF11 Increases with Age and Inhibits Skeletal Muscle Regeneration.","date":"2015","source":"Cell metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/26001423","citation_count":439,"is_preprint":false},{"pmid":"12546816","id":"PMC_12546816","title":"Autoregulation of neurogenesis by GDF11.","date":"2003","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/12546816","citation_count":276,"is_preprint":false},{"pmid":"11754833","id":"PMC_11754833","title":"Assigning the positional identity of spinal motor neurons: rostrocaudal patterning of Hox-c expression by FGFs, Gdf11, and retinoids.","date":"2001","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/11754833","citation_count":247,"is_preprint":false},{"pmid":"15976303","id":"PMC_15976303","title":"GDF11 controls the timing of progenitor cell competence in developing retina.","date":"2005","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/15976303","citation_count":191,"is_preprint":false},{"pmid":"27034275","id":"PMC_27034275","title":"Biochemistry and Biology of GDF11 and Myostatin: Similarities, Differences, and Questions for Future Investigation.","date":"2016","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/27034275","citation_count":169,"is_preprint":false},{"pmid":"12414726","id":"PMC_12414726","title":"Activin type IIA and IIB receptors mediate Gdf11 signaling in axial vertebral patterning.","date":"2002","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/12414726","citation_count":164,"is_preprint":false},{"pmid":"15548585","id":"PMC_15548585","title":"GDF11 modulates NGN3+ islet progenitor cell number and promotes beta-cell differentiation in pancreas development.","date":"2004","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/15548585","citation_count":134,"is_preprint":false},{"pmid":"15988002","id":"PMC_15988002","title":"GDF11 forms a bone morphogenetic protein 1-activated latent complex that can modulate nerve growth factor-induced differentiation of PC12 cells.","date":"2005","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15988002","citation_count":127,"is_preprint":false},{"pmid":"28270449","id":"PMC_28270449","title":"Supraphysiological levels of GDF11 induce striated muscle atrophy.","date":"2017","source":"EMBO molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/28270449","citation_count":101,"is_preprint":false},{"pmid":"21197386","id":"PMC_21197386","title":"METABOLIC FUNCTIONS OF MYOSTATIN AND GDF11.","date":"2010","source":"Immunology, endocrine & metabolic agents in medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21197386","citation_count":100,"is_preprint":false},{"pmid":"30279140","id":"PMC_30279140","title":"The GDF11-FTO-PPARγ axis controls the shift of osteoporotic MSC fate to adipocyte and inhibits bone formation during osteoporosis.","date":"2018","source":"Biochimica et biophysica acta. 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Genetic studies demonstrated ActRIIA and ActRIIB cooperatively mediate Gdf11 signaling, and each can compensate for the other.\",\n      \"method\": \"Genetic epistasis (double mutant mice), biochemical binding assays, Smad2 phosphorylation assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reciprocal genetic and biochemical validation, receptor binding and downstream signaling confirmed in same study\",\n      \"pmids\": [\"12414726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"GDF11 forms a noncovalent latent complex with its SPC-cleaved prodomain, and this latent complex is activated by cleavage at a single specific site by BMP1/Tolloid family metalloproteinases. Mutant GDF11 prodomains resistant to BMP1/Tolloid cleavage act as potent stimulators of neural differentiation.\",\n      \"method\": \"In vitro biochemical reconstitution, mutagenesis of protease cleavage site, cell differentiation assays (PC12 cells)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of latent complex, site-specific mutagenesis, and functional differentiation assay in single rigorous study\",\n      \"pmids\": [\"15988002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The proprotein convertase PC5/6 (PCSK5) cleaves GDF11 at the RSRR↓N motif (P1' Asn determining selectivity) in vivo; PC5/6-deficient embryos display Gdf11-related phenotypes including altered anteroposterior patterning. In vitro and ex vivo analyses confirmed PC5/6 selectivity for GDF11.\",\n      \"method\": \"Conditional gene knockout, in vitro cleavage assays, ex vivo analysis, in situ hybridization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic loss-of-function with defined phenotype plus in vitro biochemical validation of cleavage site selectivity\",\n      \"pmids\": [\"18378898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"GDF11 mediates negative autoregulatory feedback inhibition of olfactory epithelium neurogenesis by inducing p27(Kip1) expression and reversible cell cycle arrest in neuronal progenitors. Mice lacking GDF11 have more progenitors and neurons; mice lacking follistatin (a GDF11 antagonist) show dramatically decreased neurogenesis.\",\n      \"method\": \"Mouse knockout, in vitro neurogenesis assays, p27Kip1 expression analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function mouse model with defined cellular phenotype plus identification of downstream effector (p27Kip1), replicated by follistatin knockout\",\n      \"pmids\": [\"12546816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"FGFs, Gdf11, and retinoid signals from Hensen's node and paraxial mesoderm converge to establish Hox-c positional identity of spinal motor neurons along the rostrocaudal axis of the developing spinal cord.\",\n      \"method\": \"In vitro patterning assay with chick embryos, Hox-c protein expression profiling, signal perturbation experiments\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined epistatic pathway placement with expression profiling, single lab\",\n      \"pmids\": [\"11754833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Ectopic Gdf11 expression in chick spinal cord causes rostral displacement of Hoxc protein expression domains and motor neuron column positions; follistatin (Gdf11 antagonist) has the converse effect. Gdf11 induces Smad2 phosphorylation, and activated Smad2 induces caudal Hox gene expression, establishing Gdf11→Smad2→Hox as the pathway for rostrocaudal identity in the spinal cord.\",\n      \"method\": \"In ovo electroporation, Gdf11 knockout mouse analysis, Smad2 phosphorylation assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function, loss-of-function, and biochemical signaling data in same study across two species\",\n      \"pmids\": [\"16790475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"GDF11 negatively regulates the number of NGN3+ islet progenitor cells in the pancreas and is required for beta-cell maturation. Mice deficient in Gdf11 have excess NGN3+ cells but reduced beta-cells. Similar phenotypes occur in mice deficient for SMAD2, placing GDF11-Smad2 signaling in the islet differentiation pathway parallel to Notch.\",\n      \"method\": \"Mouse knockout (Gdf11-null and Smad2-null), histological and molecular analysis of pancreatic development\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent genetic models (Gdf11-null and Smad2-null) with matching phenotypes establishing pathway position\",\n      \"pmids\": [\"15548585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"GDF11 controls the temporal window of Math5 expression in retinal progenitors, thereby determining the duration of competence for retinal ganglion cell (RGC) genesis. GDF11 acts not by affecting progenitor proliferation but by controlling the timing of Math5 expression.\",\n      \"method\": \"Mouse knockout, retinal cell counting, Math5 expression analysis\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with defined mechanism (Math5 expression timing) distinct from proliferation, replicated via multiple cell-type analysis\",\n      \"pmids\": [\"15976303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In the olfactory epithelium, GDF11 inhibits proliferation and expansion of immediate neuronal precursors (INPs), while activin βB (ACTβB) inhibits expansion of stem/early progenitor cells by a distinct mechanism. Interplay between GDF11, ACTβB, and follistatin controls both total cell number and the ratio of neuronal vs. glial cells.\",\n      \"method\": \"Mouse genetics (Fst-/- and double mutants), cell-type-specific marker analysis, in vitro neurosphere assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multi-mutant genetic analysis distinguishing GDF11 vs activin mechanisms with defined cellular readouts\",\n      \"pmids\": [\"21852401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Gdf11 secreted by newly born neurons in the developing spinal cord facilitates temporal progression of neurogenesis by upregulating p57(Kip2) and p27(Kip1) and downregulating Pax6 in progenitors, promoting cell cycle exit and reducing proliferation potential.\",\n      \"method\": \"Gdf11-/- mouse analysis, neurosphere assays, in vitro Gdf11 addition, Western blot for cell cycle regulators\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo and in vitro convergence with identified molecular effectors (p57Kip2, p27Kip1, Pax6)\",\n      \"pmids\": [\"21248112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GASP-1 and GASP-2 inhibit GDF11 (and myostatin) activity by blocking binding of the ligand to the type II receptor. Mice lacking Gasp2 show posterior transformations of the axial skeleton (opposite to Gdf11-/- anterior transformations), confirming GASP-2 as a GDF11 inhibitor in vivo.\",\n      \"method\": \"Biochemical receptor-binding blocking assays, genetic mouse models (Gasp1-/-, Gasp2-/-), skeletal phenotype analysis, muscle fiber-type assessment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical mechanism (receptor-binding block) confirmed by genetic epistasis in vivo\",\n      \"pmids\": [\"24019467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Gdf11/Smad signaling directly activates the Hoxd11 axial expression enhancer via a conserved Smad3/4 binding element (region VIII). Chromatin immunoprecipitation demonstrated direct Smad2/3 protein binding to the Hoxd11 enhancer; mutation of the Smad binding motif abolishes Gdf11-induced reporter activity and is essential for axial Hoxd11 expression in the embryo tailbud.\",\n      \"method\": \"Reporter assays (luciferase, lacZ), mutagenesis of Smad-binding element, ChIP, SIS3 (Smad3 inhibitor) treatment, transgenic mouse experiments\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP for direct binding, mutagenesis of binding element, confirmed in transgenic embryos\",\n      \"pmids\": [\"24016758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Foxg1 promotes olfactory neurogenesis by antagonizing Gdf11-mediated negative feedback. Foxg1 binds Smad transcriptional complexes and can bind Gdf11-related signaling; loss of one allele of Gdf11 substantially rescues neurogenesis defects in Foxg1-/- OE, demonstrating genetic epistasis.\",\n      \"method\": \"Genetic rescue experiments (Foxg1-/-;Gdf11-/- and Foxg1-/-;Gdf11+/- compound mutants), OE neurogenesis quantification, Fst expression analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dose-dependent genetic rescue across multiple genotypes establishes pathway order\",\n      \"pmids\": [\"19297409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GDF11 activates the canonical Smad2/3 signaling cascade in neural stem cells (Cor-1 line) via an ActRIIB/ALK5 receptor complex, significantly alters expression of ~4700 gene transcripts, suppresses cell proliferation by downregulating Cyclin D2, and inhibits migration by reducing Fascin and LASP1 expression.\",\n      \"method\": \"Receptor identification, Smad2/3 signaling assay, transcriptomic profiling, cell proliferation and scratch-wound migration assays, siRNA knockdown of EGF receptor\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (transcriptomics, proliferation, migration, signaling) in single lab\",\n      \"pmids\": [\"24244313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structures of apo-GDF11, apo-GDF8, and the GDF11:FS288 complex revealed unique structural features in the type I receptor binding site of GDF11 that confer greater potency. GDF11 is a more potent activator of SMAD2/3 and signals more effectively through ALK4/5/7 than GDF8; substitution of GDF11 residues into GDF8 enhances GDF8 activity.\",\n      \"method\": \"X-ray crystallography, SMAD2/3 phosphorylation assays, mutagenesis (GDF11 residue substitution into GDF8), receptor binding assays\",\n      \"journal\": \"BMC biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures plus mutagenesis and functional signaling assays in same study\",\n      \"pmids\": [\"28257634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GDF11 and myostatin both induce SMAD2/3 phosphorylation and inhibit myoblast differentiation, regulating identical downstream signaling. Using a GDF11-specific immunoassay (GDF11-specific reagents), GDF11 levels show a trend toward increase rather than decrease in aged rats and humans, and GDF11 significantly inhibited muscle regeneration and decreased satellite cell expansion in mice.\",\n      \"method\": \"GDF11-specific immunoassay development, SMAD2/3 phosphorylation assays, myoblast differentiation assays, in vivo muscle regeneration assays\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific validated immunoassay plus in vitro signaling and in vivo regeneration assays with defined phenotypic readout\",\n      \"pmids\": [\"26001423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Supraphysiological systemic overexpression of GDF11 (via AAV) causes substantial atrophy of skeletal and cardiac muscle in mice through activation of p-SMAD2/3 and the ubiquitin-proteasome pathway. GDF11 and myostatin activate p-SMAD2/3 with similar potency and induce comparable myotube atrophy in vitro. Greater cardiac expression of TGFβR1 may explain GDF11-specific cardiac phenotype.\",\n      \"method\": \"AAV-mediated systemic overexpression, in vitro myoblast culture assays, p-SMAD2/3 measurement, muscle mass and function measurement\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo AAV overexpression with quantified muscle atrophy plus in vitro signaling, multiple orthogonal readouts\",\n      \"pmids\": [\"28270449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PCSK5 (proprotein convertase subtilisin/kexin type 5) is required for GDF11 processing and bioactivation in triple-negative breast cancer (TNBC) cells. PCSK5 deficiency causes inactive GDF11 precursor to accumulate intracellularly. PCSK5 reconstitution mobilizes this latent GDF11 reservoir and suppresses TNBC metastasis, establishing GDF11 as a tumor suppressor inactivated by precursor sequestration.\",\n      \"method\": \"PCSK5 reconstitution in TNBC cells, 3D culture invasion assays, intraductal xenograft model, Western blot for GDF11 precursor vs. mature forms, lung metastasis quantification\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanism established by rescue (PCSK5 reconstitution), in vitro and in vivo validation, functional consequence defined\",\n      \"pmids\": [\"29161592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GDF11 inhibits bone formation by inducing SMAD2/3 phosphorylation, which represses Runx2 expression in bone marrow mesenchymal stem cells, inhibiting osteoblastic differentiation in vitro and accelerating age-related bone loss in vivo. GDF11 had no effect on osteoclast differentiation or bone resorption.\",\n      \"method\": \"In vitro osteoblast differentiation assays, SMAD2/3 phosphorylation assays, Runx2 expression analysis, intraperitoneal GDF11 injection in mice, bone histomorphometry\",\n      \"journal\": \"Calcified tissue international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro mechanistic pathway plus in vivo validation, single lab\",\n      \"pmids\": [\"27395058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Gdf11 null mice exhibit reduced bone mass through impaired osteoblast and chondrocyte maturation and increased osteoclastogenesis, while Mstn null mice display the opposite (enhanced bone mass). Mechanistically, Mstn deletion upregulates Gdf11 expression, which activates BMP signaling to enhance osteogenesis, establishing GDF11 as a pro-osteogenic factor opposing MSTN.\",\n      \"method\": \"Gdf11-/- and Mstn-/- genetic mouse models, bone mass measurement, osteoblast/chondrocyte differentiation assays, BMP signaling analysis, FST-overexpressing mouse analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models with reciprocal phenotypes and defined signaling pathway\",\n      \"pmids\": [\"32071240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GDF11 secreted from the posterior axial mesoderm integrates sacral vertebrae and hindlimb positioning by inducing Hox gene expression in two different primordia (somites and lateral plate mesoderm). Manipulating the onset of GDF11 activity in chicken embryos altered hindlimb position; comparative analysis showed that heterochronic shifts in Gdf11 expression onset correlate with evolutionary diversity of hindlimb positioning.\",\n      \"method\": \"Manipulation of GDF11 activity onset in chick embryos, comparative embryo analysis, Hox gene expression assays\",\n      \"journal\": \"Nature ecology & evolution\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function manipulation in chick with defined Hox/positional readout, single lab\",\n      \"pmids\": [\"29046533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GDF11 modulates intracellular Ca2+ signaling via the IP3 pathway in neonatal cardiomyocytes, and this Ca2+ response is required for GDF11-induced Smad2/3 phosphorylation and transcriptional activity. Blocking IP3-dependent Ca2+ release abolishes GDF11-induced Smad2/3 activity. siRNA knockdown of Smad2 and Smad3 inhibits the antihypertrophic effects of GDF11.\",\n      \"method\": \"Intracellular Ca2+ imaging, IP3 pathway inhibitors, BAPTA-AM Ca2+ chelation, Smad2/3 luciferase reporter, siRNA knockdown, cardiomyocyte hypertrophy assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal pharmacological and genetic tools in single lab with defined mechanistic pathway\",\n      \"pmids\": [\"29783655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GDF11 activates both Smad1/5/8 and Smad2/3 signaling pathways in human umbilical vein endothelial cells (HUVECs), and increases NADPH oxidase 4 (NOX4) protein expression and p-JNK and p-AMPK levels. GDF11 showed no significant effect on p38, ERK, or Akt signaling, and had no significant effect on HUVEC proliferation or migration.\",\n      \"method\": \"Western blot for phospho-signaling proteins, MTT cell viability assay, wound healing migration assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple signaling readouts in single lab but limited mechanistic depth; dual-pathway activation is the key finding\",\n      \"pmids\": [\"26919250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GDF11 induces SMAD2/3 phosphorylation and nuclear translocation via ALK5 in hepatocellular carcinoma (HCC) cells but not in primary hepatocytes. ALK5 inhibition blocks GDF11-mediated SMAD2/3 signaling and attenuates lipid accumulation in HCC cells. Transcriptomics identified TGF-β and PI3K-AKT signaling as top pathways activated.\",\n      \"method\": \"Western blot for SMAD2/3 nuclear translocation, ALK5 inhibitor (SB431542), lipidomics, transcriptomics (RNA-seq), primary hepatocyte vs. HCC cell comparison\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibitor plus transcriptomics plus lipidomics, single lab\",\n      \"pmids\": [\"33684566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GDF11 inhibits hepatic hepcidin (HAMP) expression by decreasing BMP-SMAD signaling through enhancement of SMURF1-mediated ubiquitination and by activating ERK1/2 (MAPK3/1) signaling. ERK1/2 activation is required for GDF11- or SMURF1-mediated suppression of BMP-SMAD and HAMP expression.\",\n      \"method\": \"In vivo GDF11 administration, in vitro hepatocyte treatment, Western blot for BMP-SMAD and ERK signaling, SMURF1 expression assays\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro signaling pathway dissection with pathway inhibitors, single lab\",\n      \"pmids\": [\"31418854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Crystal structure of the WFIKKN2 follistatin domain (FSD) revealed that WFIKKN2 FSD binds both GDF8 and GDF11 and blocks their interaction with the type II receptor ActRIIB. Surface-exposed residues important for antagonism were identified by alanine scanning mutagenesis. The WFIKKN2 FSD uses different residues than follistatin or FSTL3 for ligand antagonism.\",\n      \"method\": \"Crystal structure determination (1.39 Å), native gel shift assay, surface plasmon resonance, alanine scanning mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with SPR binding assays and mutagenesis in same study\",\n      \"pmids\": [\"30814254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"BMP-11/GDF11 and myostatin maintain human embryonic stem cell (hESC) self-renewal under feeder-free conditions by activating SMAD2/3 phosphorylation through type I TGF-β receptors (ALK4/5/7). The type I TGF-β receptor inhibitor SB431542 completely blocked this maintenance activity.\",\n      \"method\": \"hESC culture assays, SMAD2/3 phosphorylation measurement, pharmacological inhibition (SB431542), pluripotency marker analysis\",\n      \"journal\": \"Cloning and stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological receptor inhibition plus marker analysis, single lab\",\n      \"pmids\": [\"19751112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GDF11 promotes human extravillous trophoblast (EVT) cell invasion by stimulating MMP2 expression via ALK4/5-SMAD2/3 signaling, which upregulates inhibitor of DNA-binding protein 2 (ID2), required for GDF11-stimulated MMP2 expression and invasion.\",\n      \"method\": \"siRNA knockdown of ALK4/5 and ID2, pharmacological inhibitors, Matrigel transwell invasion assay, Western blot\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological dissection of pathway (ALK4/5→SMAD2/3→ID2→MMP2) in vitro, single lab\",\n      \"pmids\": [\"35705978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GDF11 inhibits adipogenesis in pre-adipocytes via ALK5-SMAD2/3 activation in cooperation with the WNT/β-catenin pathway. WNT/β-catenin pathway inhibition results in adipogenic differentiation despite GDF11. GDF11 also increases adiponectin secretion and glucose uptake in mature adipocytes.\",\n      \"method\": \"ALK5 inhibitor, WNT pathway inhibitor, adipogenesis assays, glucose uptake assays, transcriptomics, ob/ob mouse in vivo experiments\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological pathway dissection plus in vivo validation, single lab\",\n      \"pmids\": [\"35920128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A loss-of-function GDF11 variant (p.Arg298Gln) at the Furin protease cleavage site was identified in a human family with cleft lip/palate and vertebral/rib abnormalities mirroring Gdf11 knockout mice. Functional assays demonstrated that this substitution significantly impairs GDF11 function, confirming GDF11 processing at the furin cleavage site is essential for human development.\",\n      \"method\": \"Exome sequencing, functional assays of mutant GDF11, zebrafish gdf11 loss-of-function model\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human variant with functional validation in assays and model organism\",\n      \"pmids\": [\"31215115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Pathophysiological levels of GDF11 activate Smad2/3 signaling in human iPSC-derived myocytes and induce muscle atrophy by upregulating the E3 ubiquitin ligase Atrogin-1 via FOXO1. FOXO1 blockade reverses GDF11-induced Atrogin-1 expression and atrophic phenotype, establishing a GDF11→Smad2/3→FOXO1→Atrogin-1 axis for muscle atrophy.\",\n      \"method\": \"Human iPSC-derived myocytes, Smad2/3 phosphorylation assays, FOXO1 inhibition, Atrogin-1 expression analysis, myocyte diameter measurement\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibitor rescue plus defined molecular pathway, human cell model, single lab\",\n      \"pmids\": [\"36094432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GDF11 enhances mesenchymal stem cell (MSC) viability under hypoxia by activating TGF-β receptor/Smad2/3 signaling, which upregulates the mitochondrial protease YME1L. YME1L in turn promotes OPA1 processing, preserving mitochondrial fusion morphology. TGF-β receptor inhibitor (SB431542) or Smad2/3 inhibitor (SIS3) blocked these effects.\",\n      \"method\": \"Lentiviral GDF11 overexpression, pharmacological inhibitors of TGF-β receptor and Smad2/3, Western blot for YME1L and OPA1, mitochondrial morphology imaging, cardiac MSC transplantation\",\n      \"journal\": \"Stem cells translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection of signaling chain (receptor→Smad2/3→YME1L→OPA1), single lab\",\n      \"pmids\": [\"32515551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In chick limb, GDF11 negatively regulates both chondrogenesis and myogenesis; GDF11-soaked beads implanted into wing buds cause limb truncations and inhibit both cartilage and muscle. In vitro micromass assays confirmed inhibition of chondrogenic and myogenic differentiation. GDF11 also induces ectopic expression of Hoxd-11 and Hoxd-13, and induces expression of its own antagonist follistatin.\",\n      \"method\": \"Bead implantation in chick embryo wing buds, in vitro micromass differentiation assays, Hox gene expression analysis, follistatin expression assay\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo bead implantation plus in vitro micromass assay, single lab, avian model\",\n      \"pmids\": [\"11203700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Recombinant GDF11 induces expression of dentin sialoprotein (Dsp), an odontoblast differentiation marker, in mouse dental papilla mesenchyme in organ culture. In vivo electroporation-mediated Gdf11 gene transfer stimulated reparative dentin formation during pulpal wound healing in canine teeth.\",\n      \"method\": \"Organ culture differentiation assay, electroporation-mediated gene transfer, in vivo gene delivery in dog dental pulp\",\n      \"journal\": \"Gene therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro differentiation assay plus in vivo gene transfer with functional readout, single lab\",\n      \"pmids\": [\"12040463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GDF11 induces differentiation and apoptosis and suppresses migration of C17.2 neural stem cells. Phospho-proteomic profiling showed GDF11 significantly increases phosphorylation of p38, ERK, and Akt (MAPK pathway activation) in these cells.\",\n      \"method\": \"Phospho-proteome profiling array, Western blot validation, differentiation assays, apoptosis assays, migration assay\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — phospho-proteomics validated by Western blot, multiple cellular readouts, single lab\",\n      \"pmids\": [\"30202652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GDF11 promotes the Smad2/3 signaling pathway to upregulate HOXA3, which acts as a transcriptional repressor of NLRP3 inflammasome expression (confirmed by ChIP assay), thereby inhibiting cardiomyocyte pyroptosis in myocardial infarction.\",\n      \"method\": \"AAV9-GDF11 overexpression in MI mice, PROMO/JASPAR prediction and ChIP assay for HOXA3 binding to NLRP3 promoter, Western blot for Smad2/3 pathway\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP assay for direct HOXA3-NLRP3 interaction plus in vivo overexpression, single lab\",\n      \"pmids\": [\"33100331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Endogenous GDF11 in the adult brain is most highly expressed in neurogenic niches. Inducible conditional knockout of Gdf11 during adulthood increased proliferation of neural progenitors but decreased newborn neurons in the hippocampus, confirming that endogenous GDF11 remains a negative regulator of adult hippocampal neurogenesis.\",\n      \"method\": \"Tamoxifen-inducible conditional knockout mouse, immunohistochemistry, neural progenitor proliferation and newborn neuron quantification\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible conditional knockout with defined neurogenesis phenotype, replicates developmental findings in adult context\",\n      \"pmids\": [\"34488822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GDF11 treatment of GDF11-null kidney fibroblasts (NRK49f) induced their proliferation and activation, and promoted epithelial-to-mesenchymal transition (EMT) of renal tubular epithelial cells (IMCD-3) in a SMAD3-dependent manner. Systemic high-dose GDF11 in adult mice caused renal fibrosis and failure associated with SMAD2 phosphorylation, which was blocked by follistatin.\",\n      \"method\": \"In vitro renal cell line assays, SMAD3-dependence assays (pharmacological), in vivo GDF11 injection with follistatin rescue, 5/6 nephrectomy model\",\n      \"journal\": \"Surgery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro mechanistic pathway (SMAD3-dependent EMT) plus in vivo validation with follistatin rescue, single lab\",\n      \"pmids\": [\"29731246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GDF11 activates TGF-β/Smad2/3 and PI3K-AKT-FoxO1 signaling pathways in pancreatic beta-cells and adipose tissue to protect beta-cell function and survival. Anti-GDF11 monoclonal antibody treatment caused beta-cell failure, establishing an endogenous requirement for GDF11 signaling in beta-cell maintenance.\",\n      \"method\": \"Recombinant GDF11 supplementation, anti-GDF11 antibody neutralization, in vitro islet and MIN6 cell assays, signaling pathway analysis\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function and loss-of-function (antibody) with signaling pathway identification, single lab\",\n      \"pmids\": [\"28450417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Endogenous GDF11 expressed in adult rat CNS is found in most neurons and their axons, as well as in astrocytes and ependymal cells, demonstrating widespread expression throughout the adult brain.\",\n      \"method\": \"Immunohistochemistry in adult rat CNS sections\",\n      \"journal\": \"Journal of chemical neuroanatomy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by IHC without functional consequence in same study\",\n      \"pmids\": [\"29448002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Systemic recombinant GDF11 delivery prior to myocardial ischemia-reperfusion in mice augmented infarct size by accelerating pro-apoptotic signaling. Targeted transcriptomics revealed attenuated Nkx2-5 expression in CD105+ cells with adjacent pro-apoptotic caspase-3 activity, suggesting an indirect apoptotic effect. In humans, circulating GDF11 levels increase with age and predict larger infarct size independently.\",\n      \"method\": \"Recombinant GDF11 delivery in mice, ischemia-reperfusion model, targeted transcriptomics, immunomapping, validated LC-MS/MS GDF11 assay in human MI patients\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model with mechanistic transcriptomic analysis plus validated human mass spectrometry assay, single lab\",\n      \"pmids\": [\"37742057\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GDF11 is a secreted TGF-β superfamily ligand that is synthesized as a latent precursor requiring proteolytic activation: proprotein convertases (PC5/6 and furin-site convertases) perform an initial cleavage, and BMP1/Tolloid metalloproteinases then cleave the prodomain to release active ligand; active GDF11 binds type II receptors ActRIIA and ActRIIB (with higher potency than GDF8/myostatin), recruits type I receptors ALK4/5/7, and activates Smad2/3 (and to a lesser extent Smad1/5/8) signaling to regulate diverse developmental and adult tissue processes including rostrocaudal Hox gene patterning (via direct Smad3 binding to Hox enhancers), negative feedback control of neurogenesis (inducing p27Kip1/p57Kip2 and cell cycle exit), retinal progenitor competence timing (via Math5 expression window control), pancreatic islet progenitor number and beta-cell maturation, osteoblast differentiation (repressing Runx2 via Smad2/3), and skeletal muscle mass regulation (inducing Atrogin-1 via FOXO1); its activity is antagonized extracellularly by follistatin, GASP-1, GASP-2, and WFIKKN2, all of which block type II receptor binding.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GDF11 is a secreted TGF-β superfamily ligand that signals through activin type II receptors (ActRIIA and ActRIIB) and type I receptors (ALK4/5/7) to activate canonical SMAD2/3 phosphorylation, controlling rostrocaudal axial patterning, progenitor cell-cycle exit, and adult tissue homeostasis across multiple organs [#0, #5, #14]. It is produced as a latent precursor activated by ordered proteolysis: proprotein convertases including PC5/6 (PCSK5) cleave the RSRR↓N motif, and BMP1/Tolloid metalloproteinases subsequently cleave the noncovalent prodomain complex to release active ligand [#1, #2]. In developmental patterning, GDF11 signaling drives caudal Hox gene expression through direct SMAD2/3 binding to axial Hox enhancers (e.g., the Hoxd11 region VIII Smad3/4 element), positioning vertebrae, hindlimbs, and spinal motor neuron columns [#5, #11, #20]. As a negative-feedback regulator of neurogenesis, GDF11 induces p27Kip1 and p57Kip2 to enforce reversible cell-cycle arrest in neuronal progenitors, limiting their number in both embryonic and adult neurogenic niches; it likewise restrains pancreatic NGN3+ islet progenitor expansion while promoting beta-cell maturation [#3, #9, #36, #6]. In adult tissues GDF11 acts through SMAD2/3 to repress Runx2 and osteoblast differentiation, and to induce skeletal and cardiac muscle atrophy via a SMAD2/3→FOXO1→Atrogin-1 axis engaging the ubiquitin-proteasome pathway [#18, #16, #30]. Extracellularly its activity is blocked by antagonists including GASP-1, GASP-2, and the WFIKKN2 follistatin domain, which prevent type II receptor binding [#10, #25]. A loss-of-function variant at the furin cleavage site (p.Arg298Gln) causes a human syndrome of cleft lip/palate and vertebral/rib anomalies mirroring Gdf11-null mice, establishing GDF11 processing as essential for human development [#29].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established GDF11 as a diffusible morphogen that negatively regulates differentiation and induces Hox gene expression, defining its role in axial and limb patterning.\",\n      \"evidence\": \"Bead implantation and micromass assays in chick wing buds with Hox and follistatin expression readouts\",\n      \"pmids\": [\"11203700\", \"11754833\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor identity and intracellular transducer not defined in these early studies\", \"Avian gain-of-function only; endogenous requirement not tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified the receptor system, showing GDF11 binds ActRIIA and ActRIIB and induces Smad2 phosphorylation to pattern axial vertebrae, anchoring the signaling pathway in vivo.\",\n      \"evidence\": \"Double-mutant mouse genetics, biochemical receptor binding, and Smad2 phosphorylation assays\",\n      \"pmids\": [\"12414726\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Type I receptor partner not resolved in this study\", \"Direct transcriptional targets downstream of Smad2 not identified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined GDF11 as a negative-feedback regulator of neurogenesis acting through p27Kip1-mediated cell-cycle arrest, explaining how progenitor numbers are autoregulated.\",\n      \"evidence\": \"Gdf11 and follistatin knockout mice with in vitro neurogenesis and p27Kip1 expression analysis\",\n      \"pmids\": [\"12546816\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GDF11 levels are sensed to set the feedback threshold not defined\", \"Receptor complex in olfactory progenitors not specified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved the activation mechanism: GDF11 is held latent by its SPC-cleaved prodomain and liberated by BMP1/Tolloid cleavage, identifying a key control point on ligand bioavailability.\",\n      \"evidence\": \"In vitro reconstitution of the latent complex, cleavage-site mutagenesis, and PC12 differentiation assays\",\n      \"pmids\": [\"15988002\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution of BMP1/Tolloid versus other proteases not quantified\", \"Spatial regulation of activation in tissues not addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed GDF11 controls competence timing rather than proliferation, setting the Math5 expression window that limits retinal ganglion cell genesis — distinguishing a timing mechanism from a proliferative one.\",\n      \"evidence\": \"Gdf11 knockout mice with retinal cell counting and Math5 expression analysis\",\n      \"pmids\": [\"15976303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between Smad signaling and Math5 regulation not defined\", \"Mechanism distinguishing competence from proliferation control unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established the Gdf11→Smad2→caudal Hox pathway for rostrocaudal spinal identity by gain- and loss-of-function across species, formalizing the signaling logic of axial patterning.\",\n      \"evidence\": \"In ovo electroporation, Gdf11 knockout analysis, and Smad2 phosphorylation assays\",\n      \"pmids\": [\"16790475\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Smad2 acts directly at Hox enhancers not yet shown (later addressed in 2013)\", \"Cofactors conferring caudal specificity unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placed GDF11-Smad2 signaling in pancreatic islet differentiation, showing it restrains NGN3+ progenitor number and is required for beta-cell maturation.\",\n      \"evidence\": \"Gdf11-null and Smad2-null mouse models with histological and molecular analysis of pancreas\",\n      \"pmids\": [\"15548585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship to Notch signaling defined only as parallel, not mechanistically integrated\", \"Direct transcriptional targets in islet progenitors not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified PC5/6 as the proprotein convertase cleaving GDF11 at RSRR↓N in vivo, defining selectivity determinants of the first activating cleavage.\",\n      \"evidence\": \"Conditional knockout, in vitro cleavage assays, and in situ hybridization\",\n      \"pmids\": [\"18378898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redundancy with furin and other convertases not fully resolved\", \"Tissue-specific convertase usage not mapped\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Refined the neurogenic feedback model by distinguishing GDF11 (inhibits immediate neuronal precursors) from activin βB (inhibits stem/early progenitors) and identifying additional effectors p57Kip2 and Pax6.\",\n      \"evidence\": \"Multi-mutant mouse genetics, neurosphere assays, and Western blots for cell-cycle regulators\",\n      \"pmids\": [\"21852401\", \"21248112\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How distinct progenitor populations respond differentially to related ligands unclear\", \"Receptor-level basis for GDF11 versus activin specificity not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated GDF11 maintains hESC self-renewal through type I TGF-β receptor (ALK4/5/7)–dependent SMAD2/3 activation and revealed Foxg1 antagonizes GDF11 feedback in neurogenesis via genetic epistasis.\",\n      \"evidence\": \"hESC culture with SB431542 inhibition and compound-mutant genetic rescue in mouse olfactory epithelium\",\n      \"pmids\": [\"19751112\", \"19297409\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct Foxg1–Smad biochemical interaction not fully resolved\", \"hESC pluripotency role uses pharmacology that does not isolate GDF11 from related ligands\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided direct molecular evidence that Smad2/3 binds axial Hox enhancers and identified GASP-2 as an in vivo GDF11 antagonist acting by blocking type II receptor binding.\",\n      \"evidence\": \"ChIP, enhancer mutagenesis, transgenic embryos, plus receptor-binding blocking assays and Gasp1/Gasp2 knockout skeletal phenotyping\",\n      \"pmids\": [\"24016758\", \"24019467\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full repertoire of direct Smad-bound Hox enhancers not mapped\", \"GASP antagonist tissue specificity and relative potency versus follistatin not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Using a GDF11-specific immunoassay, showed GDF11 and myostatin share identical SMAD2/3-mediated inhibition of myoblast differentiation and that GDF11 inhibits muscle regeneration, reframing GDF11 as a potential negative regulator of muscle.\",\n      \"evidence\": \"Validated GDF11-specific immunoassay, SMAD2/3 phosphorylation, myoblast differentiation, and in vivo regeneration assays\",\n      \"pmids\": [\"26001423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular features distinguishing GDF11 from myostatin in muscle not resolved here\", \"Endogenous circulating GDF11 dynamics across age debated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended GDF11's catabolic role to bone, showing SMAD2/3-mediated Runx2 repression inhibits osteoblast differentiation and accelerates age-related bone loss.\",\n      \"evidence\": \"In vitro osteoblast differentiation, Runx2 analysis, and in vivo GDF11 injection with bone histomorphometry\",\n      \"pmids\": [\"27395058\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation with later genetic evidence of a pro-osteogenic role not addressed\", \"Dose dependence of bone effects not delineated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Crystal structures explained GDF11's greater potency over GDF8 via type I receptor binding-site features and confirmed supraphysiological GDF11 drives skeletal and cardiac atrophy through SMAD2/3 and the ubiquitin-proteasome pathway.\",\n      \"evidence\": \"X-ray crystallography with mutagenesis and signaling assays; AAV-mediated systemic overexpression with muscle mass measurement\",\n      \"pmids\": [\"28257634\", \"28270449\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological versus supraphysiological dose effects remain a central ambiguity\", \"Cardiac specificity attributed to TGFβR1 expression not mechanistically proven\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a tumor-suppressive mechanism in which PCSK5 mobilizes a sequestered latent GDF11 reservoir to suppress breast cancer metastasis, linking convertase processing to disease.\",\n      \"evidence\": \"PCSK5 reconstitution in TNBC cells, invasion assays, intraductal xenografts, and precursor/mature GDF11 Western blots\",\n      \"pmids\": [\"29161592\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of precursor sequestration across cancer types unknown\", \"Receptor and transcriptional output mediating metastasis suppression not detailed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established a human Mendelian link: a furin-site GDF11 variant (p.Arg298Gln) impairs processing and causes craniofacial and axial skeletal anomalies, and structural work defined how WFIKKN2 antagonizes GDF11.\",\n      \"evidence\": \"Exome sequencing with functional assays and zebrafish model; WFIKKN2 follistatin-domain crystal structure with SPR and alanine scanning\",\n      \"pmids\": [\"31215115\", \"30814254\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Full phenotypic spectrum of GDF11 variants in humans not catalogued\", \"Relative in vivo contribution of WFIKKN2 versus other antagonists unquantified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Broadened GDF11 context-dependent signaling beyond canonical SMAD2/3, documenting ALK5-dependent effects in hepatocellular carcinoma lipid handling, ERK/SMURF1-mediated hepcidin suppression, and ID2→MMP2-driven trophoblast invasion.\",\n      \"evidence\": \"ALK5 inhibitor (SB431542), transcriptomics/lipidomics, SMURF1 and ERK pathway analysis, and siRNA invasion assays across hepatocyte, hepatic, and trophoblast systems\",\n      \"pmids\": [\"33684566\", \"31418854\", \"35705978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-type determinants of divergent (SMAD versus ERK/PI3K) output not defined\", \"Most effects shown in single-lab cell models without genetic confirmation\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genetic models complicated the bone story, showing Gdf11-null mice have reduced bone mass via BMP signaling and opposing myostatin, establishing GDF11 as pro-osteogenic and revealing antagonist-dependent context.\",\n      \"evidence\": \"Gdf11-/- and Mstn-/- mouse models with bone mass measurement, differentiation assays, and BMP signaling analysis\",\n      \"pmids\": [\"32071240\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic reconciliation with SMAD2/3-mediated Runx2 repression in osteoblasts not achieved\", \"Conditions favoring SMAD2/3 versus BMP output in bone unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved the muscle-atrophy mechanism in human cells as a SMAD2/3→FOXO1→Atrogin-1 axis, providing a defined transcriptional route from ligand to proteolytic atrophy.\",\n      \"evidence\": \"Human iPSC-derived myocytes with FOXO1 inhibition, SMAD2/3 phosphorylation, and Atrogin-1 expression analysis\",\n      \"pmids\": [\"36094432\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this axis operates at physiological GDF11 levels in vivo not established\", \"Single human cell model, no in vivo genetic confirmation\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Inducible adult conditional knockout confirmed endogenous GDF11 remains a negative regulator of adult hippocampal neurogenesis, extending the developmental feedback role into adulthood.\",\n      \"evidence\": \"Tamoxifen-inducible Gdf11 conditional knockout with progenitor proliferation and newborn neuron quantification\",\n      \"pmids\": [\"34488822\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor and effector identity in adult niche not specified\", \"Functional/behavioral consequences not assessed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Characterized GDF11's cardiac injury context, showing systemic GDF11 augments infarct size via pro-apoptotic signaling and correlates with age-associated circulating levels in human MI patients.\",\n      \"evidence\": \"Recombinant GDF11 delivery in ischemia-reperfusion mice, targeted transcriptomics, and validated LC-MS/MS GDF11 assay in patients\",\n      \"pmids\": [\"37742057\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect apoptotic mechanism not fully separated\", \"Causality of human circulating GDF11 versus correlation not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single ligand produces opposite tissue outcomes (e.g., catabolic versus pro-osteogenic bone effects, beneficial versus harmful cardiac effects) and what determines the choice between SMAD2/3, SMAD1/5/8, and non-canonical (ERK/PI3K/Ca2+) outputs at physiological doses.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model reconciling dose-, receptor-, and context-dependent signaling outputs\", \"Physiological versus supraphysiological effect thresholds not defined across tissues\", \"Antagonist-dependent switching of downstream pathway output not mechanistically mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 5, 14]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 13, 26]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 14]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 6, 7, 11, 20]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 2, 16, 30]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ACVR2A\", \"ACVR2B\", \"ACVR1B\", \"TGFBR1\", \"FST\", \"WFIKKN2\", \"PCSK5\", \"BMP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}