Affinage

GREM2

Gremlin-2 · UniProt Q9H772

Length
168 aa
Mass
19.3 kDa
Annotated
2026-06-10
31 papers in source corpus 18 papers cited in narrative 18 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 6/6 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

GREM2 (PRDC) is a secreted DAN-family BMP antagonist with a cysteine-knot fold that directly binds BMP2, BMP4, and BMP7 — but not activin A — to block BMP receptor signaling and lower SMAD1/5/8 phosphorylation (PMID:9639362, PMID:22381466). Through this antagonism it tunes BMP signal intensity during multiple developmental and homeostatic programs: it suppresses osteoblast differentiation and mineralization, with reciprocal loss-of-function elevating pSMAD1/5/8 and bone marker expression and Grem2-deficient mice showing increased trabecular bone mass (PMID:19073177, PMID:38839844); it shapes epibranchial placode neurogenesis via control of Bmp4 (PMID:19836367); and it drives atrial cardiomyocyte specification, where a gain-of-function Q76E variant with enhanced BMP-inhibitory activity is linked to atrial fibrillation (PMID:23223679, PMID:27023256). GREM2 also inhibits visceral fat browning by antagonizing BMP4/7–SMAD1/5/8 signaling specifically through the receptor BMPR2 (PMID:35349825), and it is required for normal tooth morphogenesis, with tooth-agenesis-associated variants reducing GREM2 transcriptional activity and downstream MSX1 expression (PMID:24686385, PMID:33369218). Beyond canonical BMP inhibition, GREM2 can shift SMAD balance pathologically, increasing pro-apoptotic SMAD2/3 while lowering pro-survival SMAD1/5/8 to promote podocyte apoptosis, and elevated GREM2 mediates EMT and tubular injury in diabetic kidney disease (PMID:30831151, PMID:39757007). Its expression is induced by Wnt/β-catenin signaling in a Tcf/LEF-independent manner and by STAT3, positioning GREM2 as a regulated node coupling upstream pathways to BMP output (PMID:17222801, PMID:41322616). GREM2 additionally possesses a lysine-rich heparin/heparan-sulfate-binding motif that is dispensable for BMP antagonism but enhances heparin affinity of the GREM2–BMP2 complex (PMID:28104757).

Mechanistic history

Synthesis pass · year-by-year structured walk · 13 steps
  1. 1998 Medium

    Establishing GREM2's molecular identity: it was unknown what PRDC was, and structural cloning defined it as a secreted cysteine-knot protein of the DAN/cerberus signaling family expressed in developing neurons.

    Evidence Gene trap in ES cells, cDNA structural analysis, lacZ reporter in embryos

    PMID:9639362

    Open questions at the time
    • No biochemical ligand or receptor identified at this stage
    • Functional role inferred only from family membership and expression pattern
  2. 2007 Medium

    Addressing how GREM2 is regulated and what it connects to: Wnt/β-catenin was shown to induce GREM2 in a Tcf/LEF-independent way, and the induced protein antagonized BMP-4 but not Wnt, placing GREM2 as a Wnt-to-BMP relay.

    Evidence Microarray and conditioned-media BMP-4 reporter assay in L929 fibroblasts

    PMID:17222801

    Open questions at the time
    • Mechanism of Tcf/LEF-independent induction unresolved
    • Single cell-line context, no in vivo confirmation
  3. 2008 High

    Demonstrating cellular function: GREM2 was shown to suppress osteoblast differentiation, with reciprocal gain/loss-of-function tying its effect directly to pSMAD1/5/8 levels.

    Evidence Adenoviral overexpression and siRNA in primary mouse osteoblasts, ALP/mineralization assays, pSMAD1/5/8 Western blot

    PMID:19073177

    Open questions at the time
    • Direct ligand binding not yet demonstrated in this study
    • In vivo skeletal relevance not addressed
  4. 2009 High

    Testing developmental function in vivo: reciprocal gain/loss-of-function in chick established that GREM2 controls epibranchial placode neurogenesis through regulation of Bmp4.

    Evidence In ovo gain- and loss-of-function in chick embryos with in situ hybridization

    PMID:19836367

    Open questions at the time
    • Mechanism of Bmp4 feedback regulation not defined
    • No mammalian validation
  5. 2012 High

    Defining the biochemical mechanism and cardiac role: recombinant GREM2 was shown to bind BMP2/4/7 directly and inhibit BMP activity, and an AF-associated Q76E gain-of-function variant linked GREM2-controlled BMP signaling to atrial cardiomyocyte differentiation and cardiac laterality.

    Evidence Recombinant protein binding and luciferase assays, circular dichroism; AF proband sequencing, zebrafish overexpression with live imaging, mouse ES cell differentiation

    PMID:22381466 PMID:23223679

    Open questions at the time
    • Receptor-level mechanism not resolved
    • Causal contribution of Q76E to human AF not established at population scale
  6. 2014 Medium

    Confirming a required developmental role: Grem2 knockout mice display malformed incisors, showing GREM2 is necessary for normal tooth morphogenesis.

    Evidence Grem2-/- mouse model with histology and DEXA phenotyping

    PMID:24686385

    Open questions at the time
    • Molecular pathway driving dental phenotype not dissected
    • Single-method phenotypic description
  7. 2016 Medium

    Extending BMP fine-tuning to reproduction and cardiac differentiation: GREM2 was shown to antagonize BMP2/4 gene-specifically in human fetal ovarian somatic cells and to drive atrial-like cardiomyocyte differentiation from ES-derived embryoid bodies.

    Evidence Recombinant GREM2 on primary human fetal ovarian cells with qRT-PCR; mouse ES embryoid-body differentiation with molecular/histological/electrophysiological readouts

    PMID:27023256 PMID:27385727

    Open questions at the time
    • Gene-specificity mechanism of BMP modulation unexplained
    • In vivo ovarian role not tested
  8. 2017 High

    Resolving a non-BMP biochemical property: GREM2 carries a lysine-rich heparin/HS-binding motif dispensable for BMP antagonism, and the GREM2–BMP2 complex binds heparin more avidly than either partner alone.

    Evidence Site-directed mutagenesis, heparin-binding and cell-surface binding assays, BMP antagonism assay

    PMID:28104757

    Open questions at the time
    • Physiological role of heparin/HS binding in vivo unknown
    • How HS binding shapes extracellular GREM2 distribution unresolved
  9. 2019 High

    Uncovering a pathological SMAD-balance mechanism and a cancer role: GREM2 was shown to promote podocyte apoptosis by shifting SMAD2/3 up and SMAD1/5/8 down, and separately to maintain gastric cancer stem-cell properties through JNK signaling.

    Evidence Podocyte overexpression/knockdown with pSMAD Western blots and pharmacological rescue (SIS3, BMP-7); gastric CSC siRNA knockdown with JNK modulation and xenografts

    PMID:30831151 PMID:31345097

    Open questions at the time
    • How GREM2 differentially biases the two SMAD arms is unknown
    • Link between BMP antagonism and JNK activation not mechanistically connected
  10. 2021 Medium

    Linking human variants to mechanism: tooth-agenesis-associated GREM2 mutations reduce GREM2 transcriptional activity and lower MSX1 expression while altering cell migration/proliferation.

    Evidence Mutant/reference GREM2 transfection in SHED cells, luciferase, Western blot, migration/proliferation assays, qRT-PCR of MSX1/PAX9/AXIN2

    PMID:33369218

    Open questions at the time
    • Causal chain from reduced GREM2 to dental agenesis not established in vivo
    • Single cell-model functional inference
  11. 2022 High

    Defining receptor-level mechanism in metabolism and a compensatory disease role: GREM2 inhibits visceral fat browning by antagonizing BMP4/7–SMAD1/5/8 specifically via BMPR2, and decreased PRDC in pulmonary arterial hypertension acts compensatorily on smooth-muscle behavior.

    Evidence Grem2 overexpression/KO and Pdgfrα-specific Bmpr2 KO mice, recombinant Grem2, SMAD1/5/8 assays, ELISA; monocrotaline rat PAH model with PRDC supplementation and in vitro SMC assays

    PMID:35349825 PMID:35414785

    Open questions at the time
    • Whether BMPR2 dependence generalizes to other GREM2 contexts unknown
    • Source and regulation of circulating GREM2 not defined
  12. 2024 High

    Confirming the skeletal phenotype genetically: partial and full Grem2 inactivation increased trabecular bone mass and enhanced BMP-2-stimulated osteoblast differentiation, validating GREM2 as an in vivo suppressor of osteoblastogenesis.

    Evidence Grem2+/- and Grem2-/- mice, micro-CT/DEXA, primary osteoblast differentiation with BMP-2 and qRT-PCR

    PMID:38839844

    Open questions at the time
    • Sex-specificity of the BMD phenotype not explained
    • Cell-type origin of the effect not isolated
  13. 2025 Medium

    Identifying an upstream transcriptional regulator and an inflammatory/fibrotic context: GREM2 is a STAT3 transcriptional target whose suppression reduces proinflammatory cytokines, and GREM2 knockdown prevents high-glucose/cholesterol-induced renal tubular fibrosis and senescence.

    Evidence STAT3 dual-luciferase and siRNA in LPS-stimulated thyroid cells; Grem2 siRNA in renal tubular epithelial cells with EMT markers and db/db mouse data

    PMID:39757007 PMID:41322616

    Open questions at the time
    • Whether STAT3-driven GREM2 acts through BMP antagonism in inflammation is unclear
    • Direct vs indirect role of GREM2 in EMT not separated

Open questions

Synthesis pass · forward-looking unresolved questions
  • How GREM2 mechanistically biases between the BMP (SMAD1/5/8) and TGF-β (SMAD2/3) arms, and how receptor selectivity (e.g., BMPR2 dependence) and heparan-sulfate binding shape its tissue-specific outputs, remains unresolved.
  • No structural model of GREM2–BMP–receptor assembly
  • Mechanism of SMAD-arm switching unknown
  • Physiological function of HS binding undefined

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0098772 molecular function regulator activity 4
Localization
GO:0005576 extracellular region 3
Pathway
R-HSA-162582 Signal Transduction 4 R-HSA-1266738 Developmental Biology 3
Partners
BMP2BMP4BMP7BMPR2

Evidence

Reading pass · 18 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
1998 PRDC (GREM2) was identified as a novel secreted protein with a cysteine knot structure, belonging to the DAN/cerberus family of signaling molecules, expressed in commissural neurons of the developing spinal cord. Gene trap in ES cells, cDNA structural analysis, lacZ reporter expression in embryos Development, growth & differentiation Medium 9639362
2008 PRDC (GREM2) inhibits osteoblastic differentiation by suppressing exogenous BMP activity and reducing phosphorylated Smad1/5/8 levels; forced PRDC expression inhibited bone marker genes and mineralization, while PRDC siRNA knockdown elevated alkaline phosphatase activity, increased pSmad1/5/8, and promoted mineralized matrix deposition. Adenoviral overexpression, siRNA knockdown, cell-based assays (ALP activity, mineralization), Western blot for pSmad1/5/8 in primary mouse osteoblasts Experimental cell research High 19073177
2007 PRDC (GREM2) expression is induced by Wnt/beta-catenin signaling in a Tcf/LEF-independent manner; the secreted PRDC induced by beta-catenin antagonizes BMP-4 signaling (but not Wnt signaling itself), establishing PRDC as a mediator linking Wnt activation to BMP-4 inhibition. Microarray, conditioned media BMP-4 reporter assay, Wnt pathway activation in L929 fibroblasts Biochemical and biophysical research communications Medium 17222801
2009 PRDC (GREM2) modulates BMP signaling to regulate epibranchial placode neurogenesis in chick; gain-of-function PRDC caused loss of Bmp4 expression and inhibited placode neurogenesis, while loss-of-function induced ectopic Bmp4 and expanded placode neurogenesis. In ovo gain- and loss-of-function experiments in chick embryos, in situ hybridization for Bmp4 and placode markers Developmental biology High 19836367
2012 Recombinant mouse PRDC (GREM2) was shown to directly bind BMP2, BMP4, and BMP7 (but not activin A), and to inhibit BMP2 and BMP4 activity in a cell-based luciferase reporter assay, confirming its biochemical function as a BMP antagonist. Recombinant protein expression/purification from E. coli, direct binding assay, cell-based luciferase reporter assay, circular dichroism Protein expression and purification High 22381466
2012 GREM2 regulates BMP signaling to control cardiac laterality and atrial cardiomyocyte differentiation during embryonic development; a Q76E variant with increased BMP inhibitory activity was identified in AF patients; GREM2 overactivity in zebrafish caused slower cardiac contraction rates and abnormal atrial contraction velocity; in mouse ES cells, GREM2 induced atrial-specific genes including connexin-40, sarcolipin and atrial natriuretic peptide. Sequencing of AF probands, zebrafish overexpression, live heart imaging, mouse ES cell differentiation, gene expression analysis Disease models & mechanisms High 23223679
2014 Grem2 knockout mice develop malformed mandibular and maxillary incisors, demonstrating that GREM2 is required for normal tooth morphogenesis in vivo. Grem2-/- mouse model, high-throughput phenotypic screen, histology, DEXA Veterinary pathology Medium 24686385
2016 GREM2 antagonizes BMP2- and BMP4-induced gene expression in human fetal ovarian somatic cells in a gene-specific manner, fine-tuning BMP signal intensity to influence pre-granulosa cell differentiation around the time of primordial follicle formation. Primary human fetal ovarian somatic cell cultures treated with recombinant GREM1/GREM2 and BMP2/4, qRT-PCR for target gene expression Molecular human reproduction Medium 27385727
2016 Treatment of mouse embryonic stem cell-derived embryoid bodies with Grem2 (secreted BMP antagonist) drives differentiation toward atrial cardiomyocytes with atrial-like molecular, histological, and electrophysiological characteristics. Mouse ES cell differentiation protocol, Myh6-DSRed-Nuc reporter line, molecular/histological/electrophysiological analyses Journal of visualized experiments : JoVE Medium 27023256
2017 Grem2 contains a heparin/heparan sulfate (HS)-binding motif composed of specific lysine residues; these residues are required for heparin/HS binding but not for BMP antagonism; the Grem2-BMP2 complex exhibits significantly higher heparin affinity than either protein alone, and this increase is partially independent of the Grem2 HS-binding epitope. Site-directed mutagenesis, heparin-binding measurements, cell surface-binding analysis, in vitro BMP antagonism assay The Biochemical journal High 28104757
2019 Grem2 promotes podocyte apoptosis in high-glucose conditions by increasing phosphorylation of Smad2/3 (pro-apoptotic TGF-β arm) and decreasing phosphorylation of Smad1/5/8 (pro-survival BMP arm); inhibiting Smad2/3 (SIS3) or activating Smad1/5/8 (BMP-7) attenuated Grem2-induced apoptosis. Podocyte transfection with Grem2 plasmid, siRNA knockdown, Western blot for pSmad2/3 and pSmad1/5/8, apoptosis assays, pharmacological rescue (SIS3, BMP-7) Biochimie High 30831151
2019 GREM2 maintains stem cell-like properties in gastric cancer stem cells through activation of the JNK signaling pathway; GREM2 silencing or JNK inhibition suppressed proliferation, migration, invasion, and promoted apoptosis in vitro, and inhibited tumorigenesis and lymph node metastasis in vivo. siRNA knockdown, JNK activator/inhibitor treatment, cell proliferation/migration/invasion/apoptosis assays, in vivo xenograft Cell cycle (Georgetown, Tex.) Medium 31345097
2021 GREM2 mutations associated with tooth agenesis reduce transcriptional activity of the GREM2 gene and decrease MSX1 expression; GREM2 mutant cells show increased cell migration and altered cell proliferation, demonstrating functional consequences of TA-associated variants. Transfection of SHED cells with mutant/reference GREM2 plasmids, luciferase transcriptional activity, Western blot, cell migration and proliferation assays, qRT-PCR for MSX1/PAX9/AXIN2 Orthodontics & craniofacial research Medium 33369218
2022 GREM2 inhibits the browning program of visceral preadipocytes partially by antagonizing BMP4/7-SMAD1/5/8 signaling through BMPR2; Grem2 overexpression reduced visceral fat browning capacity in mice, while Grem2 ablation enhanced browning and reduced visceral fat; preadipocyte-specific Bmpr2 knockout abolished Grem2's antagonistic effect on browning. Recombinant Grem2 protein treatment, Grem2 overexpression and knockout mouse models, Pdgfrα-specific Bmpr2 knockout mice, SMAD1/5/8 phosphorylation assays, circulating GREM2 ELISA EBioMedicine High 35349825
2022 Decreased PRDC (GREM2) in pulmonary arterial hypertension lungs has a compensatory role; in vitro, PRDC reversed the effects of BMP2/4 on smooth muscle cell proliferation, migration, and apoptosis; in vivo PRDC supplementation deteriorated rat PAH, indicating that compensatory PRDC decrease slows disease progression. Human lung tissue analysis, monocrotaline rat PAH model, in vitro cell experiments (proliferation, migration, apoptosis assays), in vivo PRDC supplementation International journal of biological sciences Medium 35414785
2024 Partial Grem2 inactivation (Grem2+/- mice) increased trabecular BMD and trabecular thickness in female mice; Grem2 deletion stimulated osteoblast differentiation (elevated Alp, Bglap, Sp7 mRNA) after BMP-2 stimulation in calvarial and long bone osteoblasts, confirming GREM2 as a BMP antagonist suppressing osteoblastogenesis in vivo. Grem2+/- and Grem2-/- mouse models, micro-CT/DEXA bone analysis, primary osteoblast differentiation assays with BMP-2 stimulation, qRT-PCR Scientific reports High 38839844
2025 GREM2 is a downstream transcriptional target of STAT3; dexamethasone inhibits STAT3 phosphorylation, thereby reducing GREM2 expression and downstream proinflammatory cytokines (TNF-α, IL-1β, CCL2) in thyroid cells. Dual-luciferase assay for STAT3-driven GREM2 transcription, siRNA interference of STAT3, in vitro LPS-stimulated thyroid cell model (Nthy-ori 3-1) ACS omega Medium 41322616
2025 Grem2 knockdown in renal tubular epithelial cells prevented fibrosis and senescence induced by high glucose and cholesterol, indicating that elevated Grem2 mediates epithelial-mesenchymal transition and tubular injury in diabetic kidney disease. siRNA knockdown of Grem2 in RTECs under high glucose/cholesterol, Western blot for EMT markers (desmin, α-SMA, fibronectin), db/db mouse model with SMUP-Cell treatment International journal of stem cells Medium 39757007

Source papers

Stage 0 corpus · 31 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2020 Cancer-associated fibroblast-secreted exosomal miR-423-5p promotes chemotherapy resistance in prostate cancer by targeting GREM2 through the TGF-β signaling pathway. Experimental & molecular medicine 104 33144675
2023 SGLT2 inhibitor empagliflozin downregulates miRNA-34a-5p and targets GREM2 to inactivate hepatic stellate cells and ameliorate non-alcoholic fatty liver disease-associated fibrosis. Metabolism: clinical and experimental 99 37422021
1998 Sequence and expression of a novel mouse gene PRDC (protein related to DAN and cerberus) identified by a gene trap approach. Development, growth & differentiation 49 9639362
2004 Identification and characterization of human CKTSF1B2 and CKTSF1B3 genes in silico. Oncology reports 48 15254711
2008 Protein related to DAN and cerberus (PRDC) inhibits osteoblastic differentiation and its suppression promotes osteogenesis in vitro. Experimental cell research 47 19073177
2012 Functional modeling in zebrafish demonstrates that the atrial-fibrillation-associated gene GREM2 regulates cardiac laterality, cardiomyocyte differentiation and atrial rhythm. Disease models & mechanisms 44 23223679
2016 BMP signalling in human fetal ovary somatic cells is modulated in a gene-specific fashion by GREM1 and GREM2. Molecular human reproduction 28 27385727
2007 Wnt/beta-catenin signaling regulates expression of PRDC, an antagonist of the BMP-4 signaling pathway. Biochemical and biophysical research communications 27 17222801
2006 Expression of the protein related to Dan and Cerberus gene--prdc--During eye, pharyngeal arch, somite, and swim bladder development in zebrafish. Developmental dynamics : an official publication of the American Association of Anatomists 27 16921498
2021 LncRNA DNM3OS regulates GREM2 via miR-127-5p to suppress early chondrogenic differentiation of rat mesenchymal stem cells under hypoxic conditions. Cellular & molecular biology letters 26 34049478
2009 PRDC regulates placode neurogenesis in chick by modulating BMP signalling. Developmental biology 25 19836367
2014 Malformation of incisor teeth in Grem2⁻/⁻ mice. Veterinary pathology 24 24686385
2022 MiR-103a-3p Contributes to the Progression of Colorectal Cancer by Regulating GREM2 Expression. Yonsei medical journal 17 35619575
2019 Grem2 mediates podocyte apoptosis in high glucose milieu. Biochimie 17 30831151
2021 miR-122-5p targets GREM2 to protect against glucocorticoid-induced endothelial damage through the BMP signaling pathway. Molecular and cellular endocrinology 15 34973370
2018 Further evidence for the role of WNT10A, WNT10B and GREM2 as candidate genes for isolated tooth agenesis. Orthodontics & craniofacial research 13 30246922
2013 Genetic variants in GREM2 are associated with bone mineral density in a southern Chinese population. The Journal of clinical endocrinology and metabolism 13 23902946
2019 GREM2 maintains stem cell-like phenotypes in gastric cancer cells by regulating the JNK signaling pathway. Cell cycle (Georgetown, Tex.) 12 31345097
2017 GREM2 nucleotide variants and the risk of tooth agenesis. Oral diseases 12 28992378
2021 Inhibiting roles of FOXA2 in liver cancer cell migration and invasion by transcriptionally suppressing microRNA-103a-3p and activating the GREM2/LATS2/YAP axis. Cytotechnology 11 34349344
2017 Analysis and identification of the Grem2 heparin/heparan sulfate-binding motif. The Biochemical journal 11 28104757
2022 GREM2 is associated with human central obesity and inhibits visceral preadipocyte browning. EBioMedicine 9 35349825
2012 Expression and purification of recombinant protein related to DAN and cerberus (PRDC). Protein expression and purification 9 22381466
2021 Functional characterization of ATF1, GREM2 AND WNT10B variants associated with tooth agenesis. Orthodontics & craniofacial research 6 33369218
2022 Compensatory roles of Protein Related to DAN and Cerberus (PRDC) decrease in pulmonary arterial hypertension. International journal of biological sciences 5 35414785
2016 Differentiation of Atrial Cardiomyocytes from Pluripotent Stem Cells Using the BMP Antagonist Grem2. Journal of visualized experiments : JoVE 4 27023256
2024 6-Shogaol alleviates high-fat diet induced hepatic steatosis through miR-3066-5p/Grem2 pathway. Food chemistry 3 38941907
2025 Mesenchymal Stem Cells Mediated Suppression of GREM2 Inhibits Renal Epithelial-Mesenchymal Transition and Attenuates the Progression of Diabetic Kidney Disease. International journal of stem cells 2 39757007
2025 Overexpression of miR-671-3p alleviates postmenopausal osteoporosis by targeting GREM2 to activate BMP2/SMAD signaling pathway. Hereditas 2 40500779
2024 GREM2 inactivation increases trabecular bone mass in mice. Scientific reports 2 38839844
2025 Integrative Transcriptome and Machine Learning Analysis Uncovers Critical STAT3/GREM2 Signaling Mechanisms in Dexamethasone Treatment of Hashimoto's Thyroiditis. ACS omega 0 41322616

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