Affinage

TBX20

T-box transcription factor TBX20 · UniProt Q9UMR3

Length
447 aa
Mass
49.2 kDa
Annotated
2026-06-10
98 papers in source corpus 35 papers cited in narrative 34 extracted findings
Cross-family judge vs UniProt: tie faithfulness: 9/9 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

TBX20 is a cardiac T-box transcription factor that binds T-half-site DNA and acts as both an activator and a repressor to assemble context-dependent regulatory complexes governing chamber specification, cardiomyocyte proliferation, and adult heart homeostasis (PMID:19414016, PMID:22328084). As an activator, TBX20 synergizes with the core cardiac cofactors NKX2-5, GATA4, TBX5, ISL1, MEF2C and CASZ1 to drive enhancers for anterior-heart-field genes (Mef2c, Nkx2-5), chamber-identity genes (Hey2, COUP-TFII/Nr2f2), and the hERG channel gene KCNH2, and to direct atrial/ventricular gene programs (PMID:15843409, PMID:17668378, PMID:28945738, PMID:29903739, PMID:36102189, PMID:32035085, PMID:28049825). As a repressor, TBX20 recruits a TLE/Groucho-NuRD corepressor complex (with RUVBL1/2 and TBX18) through an EH1 motif, an interaction required for cardiac looping and chamber formation (PMID:24024827, PMID:37756602). TBX20 restricts the non-chamber gene Tbx2 to the AVC not by direct repression but by binding SMAD1/SMAD5 and sequestering them from SMAD4, thereby attenuating BMP/Smad signaling (PMID:19661464, PMID:15843414, PMID:15901664). BMP/SMAD1 signaling, in turn, acts directly upstream to activate Tbx20 transcription, creating a regulatory circuit (PMID:20460370, PMID:21890625). In adult and postnatal cardiomyocytes TBX20 maintains ion-channel and cytoskeletal gene expression, and promotes proliferation by directly repressing the cell-cycle inhibitors p21, Meis1 and Btg2 and by engaging BMP/Smad and PI3K/AKT pathways (PMID:22080862, PMID:26841808, PMID:23751911, PMID:29903739). TBX20 also regulates endocardial valve development through versican and Wnt/Lef1 (PMID:27348591, PMID:23824573) and controls angiogenesis via the PROK2-PROKR1 pathway (PMID:29545372). Disease-associated T-box mutations alter protein structure, cofactor binding, and target activation: structural T-box mutations cause congenital heart defects (PMID:17668378, PMID:19762328), a CASZ1-disrupting mutation underlies dilated cardiomyopathy (PMID:28945738), and KCNH2-promoter-binding mutations co-segregate with atrial fibrillation (PMID:37759586, PMID:28049825). Beyond the heart, TBX20 functions in facial/vestibuloacoustic neuron migration via planar cell polarity components (PMID:17119020) and in retinal ganglion cell subtype specification [PMID:bio_10.1101_2025.04.29.651262].

Mechanistic history

Synthesis pass · year-by-year structured walk · 14 steps
  1. 2004 High

    Established that TBX20 carries an intrinsic transcriptional repressor function distinct from the activator TBX5 and that BMP2 induces its expression, framing TBX20 as a BMP-responsive repressive arm of cardiac gene control.

    Evidence Luciferase reporter/promoter deletion assays and BMP2 treatment of chick cardiogenic explants

    PMID:14978031

    Open questions at the time
    • In vitro reporter context only
    • Endogenous repression targets not yet defined
    • BMP-to-Tbx20 enhancer not yet mapped
  2. 2005 High

    Defined TBX20's place in the cardiac genetic hierarchy: it physically partners with TBX5 and acts upstream of Tbx2 to enforce chamber versus non-chamber myocardium identity, and synergizes with Isl1/Gata4 to activate Nkx2-5 and Mef2c in the anterior heart field.

    Evidence Co-IP and morpholino knockdown in Xenopus, knockout mice with marker analysis, enhancer/luciferase and transgenic assays

    PMID:15634698 PMID:15843409 PMID:15843414 PMID:15901664

    Open questions at the time
    • Mechanism of Tbx2 repression unresolved at this stage
    • Direct vs indirect activation of Nkx2-5/Mef2c not separated
  3. 2009 High

    Resolved how TBX20 represses Tbx2 — not by direct DNA binding but by sequestering SMAD1/5 from SMAD4 — and defined its preferred T-half-site recognition sequence with molten-globule biophysics of the T-box.

    Evidence Single/double knockout mice, Co-IP of Tbx20 with Smad1/5, DNA-binding-deficient mutants, SELEX-type binding and CD on purified domains

    PMID:19414016 PMID:19661464

    Open questions at the time
    • Stoichiometry of Smad sequestration not quantified
    • Genome-wide direct binding map still absent
  4. 2010 High

    Closed the regulatory loop upstream of TBX20 by showing phospho-SMAD1 directly binds a conserved cardiac enhancer to activate Tbx20 transcription, and that BMP10 feeds the same Smad-dependent promoter element.

    Evidence In vivo SMAD1 ChIP, binding-site mutagenesis, transgenic reporters across three species, BMP10 promoter assays and overexpression mice

    PMID:20460370 PMID:21890625

    Open questions at the time
    • Tissue-specific cofactors at the SMAD enhancer not defined
    • Feedback timing relative to Tbx20-Smad sequestration not modeled
  5. 2011 High

    Demonstrated TBX20 is continuously required in the adult heart for survival and identified its genome-wide direct targets, establishing a maintenance role over ion-channel, cytoskeletal, and transcription-factor genes; also placed Tbx20 upstream of Bmp2 in AVC EMT.

    Evidence Conditional adult cardiomyocyte KO with genome-wide ChIP-seq and transcriptomics; conditional AVC KO with Bmp2 rescue

    PMID:21983003 PMID:22080862

    Open questions at the time
    • Activator vs repressor target partition not yet separated
    • Cofactor identity at adult binding sites unknown
  6. 2012 High

    Resolved that TBX20 operates as both activator and repressor over distinct gene cohorts in a context-dependent, cofactor-dependent manner.

    Evidence Genome-wide ChIP-seq plus RNA-seq in adult conditional KO hearts

    PMID:22328084

    Open questions at the time
    • Specific cofactors that switch activator/repressor mode not all identified
  7. 2013 High

    Defined the molecular machinery of TBX20-mediated repression — an EH1-tethered TLE/Groucho-NuRD-RUVBL1/2-TBX18 complex — and linked TBX20 gain-of-function to proliferative BMP/Smad and PI3K/AKT signaling and to endocardial Wnt/Lef1 control.

    Evidence Tagged-Tbx20 immunoaffinity proteomics with Co-IP and EH1 mutagenesis; gain-of-function mice with pathway inhibition; endocardial conditional KO with Wnt target analysis

    PMID:23751911 PMID:23824573 PMID:24024827

    Open questions at the time
    • Direct vs indirect contribution of each corepressor subunit unresolved
    • Proliferation pathway findings from a single lab
  8. 2016 High

    Established the direct mechanism by which TBX20 drives cardiomyocyte proliferation — repression of the cell-cycle inhibitors p21, Meis1, and Btg2 — and mapped a direct endocardial enhancer for versican.

    Evidence ChIP for direct promoter binding plus in vivo gain-of-function after MI; ATAC-seq/ChIP-seq/Hi-C with binding-site-mutant reporter for Vcan

    PMID:26841808 PMID:27348591

    Open questions at the time
    • Durability of induced proliferation not established
    • Endocardial vs myocardial target overlap not compared
  9. 2017 High

    Connected TBX20 to specific channelopathy and cardiomyopathy mechanisms: it activates KCNH2/hERG to shape action potential duration, and a CASZ1-binding interaction is required to prevent dilated cardiomyopathy.

    Evidence hiPSC-CM electrophysiology with mutant analysis; proteomics, Co-IP, structural studies and Tbx20/Casz1 double-het mice

    PMID:28049825 PMID:28945738

    Open questions at the time
    • Full set of TBX20-CASZ1 co-regulated targets not enumerated
    • hERG regulation mechanism (direct vs cofactor-dependent) at promoter level partly open
  10. 2018 High

    Extended TBX20 function beyond the cardiomyocyte: it activates PROK2 to drive angiogenesis, and embryonic ChIP-seq defined its direct atrial-identity targets (COUP-TFII/Nr2f2) and cell-cycle program controlling G1-S progression.

    Evidence siRNA/zebrafish loss-of-function with prok2/prokr1a rescue and gene arrays; inducible cardiomyocyte KO with ChIP-seq and transgenic enhancer assay

    PMID:29545372 PMID:29903739

    Open questions at the time
    • Endothelial vs cardiac TBX20 cofactors not compared
    • PROK2 regulatory element not finely mapped
  11. 2020 High

    Showed that TBX20 acts within the MEF2C/GATA4/TBX5 reprogramming cohort to promote chromatin co-occupancy and synergistic activation of contraction-gene enhancers, and that it directly activates Hey2 through a Gata-cooperative ventricular enhancer; in adult zebrafish it drives dedifferentiation and endocardial Bmp6 signaling.

    Evidence ChIP-seq/ATAC-seq in human reprogramming with functional assays; Hey2 enhancer deletion/null mouse with luciferase site mutagenesis; zebrafish overexpression with Bmp6 inhibition

    PMID:32035085 PMID:32850848 PMID:36102189

    Open questions at the time
    • Order of MGT factor recruitment vs TBX20 binding not fully resolved
    • Zebrafish dedifferentiation findings from single lab
  12. 2023 High

    Validated the EH1-TLE repression circuit in vivo and elaborated stress-responsive and arrhythmia mechanisms: ER stress drives Tbx20 via ATF6 into a BMP2 feed-forward proliferative loop, and KCNH2-promoter-binding mutations co-segregate with atrial fibrillation.

    Evidence EH1 knock-in mouse with RNA-seq; ER-stress models with ATF6 inhibition, conditional KO and Bmp2 rescue; linkage/exome and reporter/binding assays for AF mutations

    PMID:36805334 PMID:37756602 PMID:37759586

    Open questions at the time
    • Stress-loop and AF mechanisms each from single studies
    • AF mutations lack ChIP/in vivo validation
  13. 2022 Medium

    Identified a non-cardiac tumor-suppressive role: TBX20 binds Ku70/Ku80 to inhibit their chromatin recruitment and NHEJ repair, with PDZRN3 controlling TBX20 turnover.

    Evidence Co-IP with domain mapping, chromatin fractionation, NHEJ repair and ubiquitination assays in colorectal cancer cells

    PMID:35348274

    Open questions at the time
    • Single lab
    • In vivo relevance to tumor suppression not established
    • Relationship to transcriptional function unclear
  14. 2025 Medium

    Extended the developmental remit of TBX20 to retinal ganglion cell subtype specification downstream of Tbr2.

    Evidence Conditional Tbx20 deletion with single-cell RNA-seq and Opn4 analysis (preprint)

    PMID:bio_10.1101_2025.04.29.651262

    Open questions at the time
    • Preprint, not peer-reviewed
    • Direct vs indirect Opn4 regulation unknown
    • Cofactors in RGCs undefined

Open questions

Synthesis pass · forward-looking unresolved questions
  • How TBX20 selects between its activator and repressor cofactor cohorts at individual loci — the molecular switch governing context-dependent complex assembly — remains undefined.
  • No structural model of the full TBX20 holo-complexes
  • Determinants of activator-vs-repressor mode selection unresolved
  • Post-translational regulation of TBX20 beyond PDZRN3 ubiquitination not characterized

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0140110 transcription regulator activity 4 GO:0003677 DNA binding 3 GO:0140097 catalytic activity, acting on DNA 1
Localization
GO:0005694 chromosome 3 GO:0005634 nucleus 2
Pathway
R-HSA-1266738 Developmental Biology 3 R-HSA-162582 Signal Transduction 3 R-HSA-74160 Gene expression (Transcription) 3 R-HSA-1640170 Cell Cycle 2 R-HSA-73894 DNA Repair 1
Partners
CASZ1GATA4MKLN1NKX2-5SMAD1TBX18TBX5TLE
Complex memberships
MEF2C/GATA4/TBX5 (MGT) reprogramming complexTLE/Groucho-NuRD corepressor complex

Evidence

Reading pass · 34 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2005 TBX5 and TBX20 physically interact; interaction domains were mapped by pulldown assays in Xenopus, and the two proteins act synergistically during early heart development. Blocking either gene alone produces similar cardiac phenotypes, demonstrating non-redundant but cooperative roles. Co-immunoprecipitation / pulldown, morpholino knockdown, cardiac physiology analysis in Xenopus Development High 15634698
2004 The C-terminal region of TBX20 functions as a transcriptional repressor, while the C-terminus of TBX5 is an activator. TBX20 represses the ANF promoter activity via TBE2, and also inhibits TBX5-mediated activation. BMP2, but not BMP2 for TBX5, induces TBX20 expression in cardiogenic explants. Luciferase reporter assays in cultured cells, promoter deletion analysis, recombinant BMP2 treatment of chick cardiogenic explants, real-time RT-PCR Journal of Biological Chemistry High 14978031
2005 Tbx20 loss-of-function in mice causes ectopic activation of Tbx2 across the entire heart myogenic field; Tbx20 is a transcriptional repressor that acts upstream of Tbx2 in the cardiac genetic hierarchy, placing Tbx20 upstream of Tbx2 in chamber vs. non-chamber myocardium lineage decisions. Gene targeting (knockout mouse), in situ hybridization, molecular marker analysis Development High 15843414 15901664
2005 Complete Tbx20 knockdown in mouse embryos causes hypoplasia of the outflow tract and right ventricle with decreased expression of Nkx2-5 and Mef2c. Tbx20 synergizes with Isl1 and Gata4 to activate both the Mef2c AHF enhancer and the Nkx2-5 cardiac enhancer in cultured cells, providing a mechanism for gene activation in the anterior heart field. Transgenic RNA interference in ES cell-derived mouse embryos, luciferase reporter/enhancer assays, transgenic mouse enhancer analysis Development High 15843409
2007 Missense mutation I152M within the TBX20 T-box DNA-binding domain disrupts the structure and function of the TBX20 T-box as shown by biophysical characterization of purified recombinant wild-type and mutant proteins. TBX20 physically interacts with NKX2-5, GATA4, and TBX5. Biophysical characterization of recombinant proteins (circular dichroism, fluorescence), functional assays of mutant proteins American Journal of Human Genetics High 17668378
2009 Tbx20 suppresses Tbx2 expression in developing cardiac chambers not by direct transcriptional repression of the Tbx2 gene, but by binding Smad1 and Smad5 and sequestering them from Smad4, thereby attenuating BMP/Smad-dependent activation of Tbx2. This was demonstrated using transfection and co-localization studies with DNA-binding-deficient Tbx20 mutants. Tbx20/Tbx2 single and double knockout mouse embryos, transfection assays, co-immunoprecipitation of Tbx20 with Smad1/Smad5, localization studies, BMP/Smad enhancer analysis Circulation Research High 19661464
2009 The TBX20 T-box preferentially binds a T-half-site as optimal DNA recognition sequence, and distinct T-boxes show significant differences in binding affinity, kinetics, and conformational stability; the Tbx20 T-box exhibits molten globule character as shown using purified recombinant domains. In vitro DNA-binding assays with purified recombinant T-box domains, SELEX-type binding site determination, biophysical characterization (circular dichroism) Journal of Molecular Biology High 19414016
2009 A gain-of-function mutation I121M in the TBX20 T-box domain alters tertiary hydrophobic interactions producing a more dynamic protein structure, leading to enhanced transcriptional activity and increased co-factor interactions with GATA4/5 and NKX2-5, as well as increased occupancy on target gene DNA. Surface plasmon resonance, CD spectropolarimetry, fluorescence spectrophotometry, luciferase assay, chromatin immunoprecipitation Journal of Medical Genetics High 19762328
2010 BMP/SMAD1 signaling directly activates Tbx20 transcription through a conserved 334 bp cardiac regulatory element containing novel non-canonical SMAD-binding sites; phospho-SMAD1 directly binds this element in vivo. Blocking SMAD1 signaling specifically abolishes Tbx20 transcription in the developing heart. Transgenic reporter analysis in Xenopus and zebrafish and mouse; SMAD1 ChIP in vivo; SMAD1-binding site mutagenesis; morpholino knockdown of SMAD1 signaling Development High 20460370
2011 Tbx20 is a downstream transcriptional mediator of BMP10; BMP10 induces Tbx20 promoter activity through a conserved Smad binding site in the Tbx20 promoter proximal region. Tbx20 overexpression in myocardium phenocopies elevated BMP10 effects on ventricular wall development. Affymetrix exon arrays, quantitative RT-PCR, in situ hybridization, promoter luciferase assay with Smad binding site analysis, transgenic mouse overexpression Journal of Biological Chemistry High 21890625
2011 Myocardial Tbx20 is required for AVC constriction and endocardial EMT; Tbx20 maintains Bmp2 expression in AVC myocardium, and re-expression of Bmp2 substantially rescues the EMT defects caused by Tbx20 loss, establishing a Tbx20→Bmp2 pathway in AVC development. Conditional knockout mouse (AVC myocardium), in situ hybridization, rescue experiment with Bmp2 re-expression Developmental Biology High 21983003
2011 Adult cardiomyocyte-specific ablation of Tbx20 results in rapid onset of severe cardiomyopathy with arrhythmias and death within 1–2 weeks. Genome-wide ChIP analysis identified direct Tbx20 binding targets in adult heart including ion channel, cytoskeletal, and transcription factor genes; a novel DNA-binding site for Tbx20 was also identified. Conditional adult cardiomyocyte-specific Tbx20 knockout, genome-wide ChIP-seq, transcriptome analysis Journal of Clinical Investigation High 22080862
2012 Genome-wide ChIP coupled with RNA-seq in adult Tbx20 conditional KO hearts revealed TBX20 functions as both a transcriptional activator and repressor, each function regulating distinct gene programs. TBX20 binds targets in a context-dependent manner, using different cohorts of co-factors. Genome-wide ChIP-seq, RNA-seq, conditional adult cardiomyocyte KO Human Molecular Genetics High 22328084
2013 Tbx20 associates with a chromatin remodeling complex composed of TLE/Groucho corepressors, NuRD complex members, RUVBL1/RUVBL2, and T-box repressor Tbx18. The interaction with TLE corepressors is mediated via an EH1 (engrailed homology 1) motif in Tbx20; ablation of this motif disrupts the repression network and Tbx20 function in vivo. Immunoaffinity purification of tagged Tbx20 + GeLC-MS/MS proteomics, Co-IP validation in embryonic mouse heart, EH1 motif mutagenesis in vivo Journal of Proteome Research High 24024827
2013 Tbx20 overexpression in postnatal and adult cardiomyocytes activates BMP2/pSmad1/5/8 and PI3K/AKT/GSK3β/β-catenin signaling pathways, promoting cardiomyocyte proliferation; inhibition of PI3K/AKT/GSK3β/β-catenin reduces but does not eliminate Tbx20-mediated proliferation, indicating parallel regulatory pathways downstream of BMP/Smad1/5/8. Cardiomyocyte-specific Tbx20 gain-of-function mouse, neonatal rat cardiomyocyte culture, PI3K inhibition, Western blot for pathway intermediates Journal of Molecular and Cellular Cardiology Medium 23751911
2013 Endocardial Tbx20 is required for valve endocardial cell proliferation and extracellular matrix development but not for initiation of EMT. Tbx20 ablation in endocardial cells causes aberrant Wnt/β-catenin signaling, and Tbx20 regulates Lef1, a key transcriptional mediator of Wnt/β-catenin signaling. Endocardial-specific conditional Tbx20 knockout, β-catenin immunostaining, qRT-PCR for Wnt target genes Development Medium 23824573
2016 Tbx20 overexpression in adult cardiomyocytes directly represses cell-cycle inhibitory genes p21, Meis1, and Btg2 as demonstrated by ChIP in neonatal cardiomyocytes. Tbx20 overexpression activates multiple pro-proliferation pathways including Akt, YAP, and BMP. Adult cardiomyocyte-specific Tbx20 overexpression in mice, ChIP assay for direct binding to p21/Meis1/Btg2 promoters, cardiac functional assessment after MI Circulation High 26841808
2017 TBX20 controls expression of the KCNH2 gene (encoding hERG channels) in human iPSC-derived cardiomyocytes; Tbx20 enhances KCNH2 gene expression and hERG currents, shortening action potential duration. A TBX20 p.R311C mutation specifically disables TBX20's pro-transcriptional activity over KCNH2 without affecting nuclear distribution. hiPSC-derived cardiomyocytes, electrophysiology (patch clamp), RT-qPCR, gene expression analysis of other channels PNAS High 28049825
2017 TBX20 physically and genetically interacts with transcription factor CASZ1; this interaction is required for survival since double heterozygous Tbx20/Casz1 mice die postnatally of dilated cardiomyopathy. A DCM-associated TBX20 mutation sterically disrupts the TBX20-CASZ1 interaction. Quantitative proteomics defined molecular pathways mis-regulated upon disruption of this complex. Unbiased proteomic screen (immunoaffinity purification + MS), Co-IP, structural studies, Tbx20+Casz1 double heterozygous mouse genetic model, quantitative proteomics PLoS Genetics High 28945738
2018 TBX20 regulates angiogenesis through transcriptional activation of PROK2 (prokineticin 2); TBX20 knockdown reduces PROK2 expression and impairs endothelial cell migration and angiogenesis. Overexpression of prok2 or prokr1a rescues impaired angiogenesis in tbx20-deficient zebrafish, placing TBX20 upstream of the PROK2-PROKR1 pathway. TBX20 siRNA knockdown, Matrigel plug angiogenesis assay, zebrafish tbx20 morpholino and CRISPR/Cas9 knockout, prok2/prokr1a overexpression rescue, angiogenesis gene array Circulation High 29545372
2018 Mid-gestation cardiomyocyte-specific Tbx20 ablation reduces cardiomyocyte proliferation and arrests cells at G1-S phase transition. TBX20 ChIP-seq from embryonic heart identified direct targets including key cell cycle genes and atrial/ventricular specific genes. TBX20 binds a conserved enhancer for COUP-TFII/Nr2f2 and directly activates genes required for atrial identity. Inducible cardiomyocyte-specific Tbx20 KO, cell cycle analysis, genome-wide transcriptome, TBX20 ChIP-seq from embryonic heart, transgenic enhancer assay Circulation Research High 29903739
2016 Endocardial TBX20 directly regulates versican (Vcan) expression through binding to a conserved long-range enhancer identified by ATAC-seq and ChIP-seq intersection with chromatin loop maps. The Vcan enhancer drives reporter expression in endocardial lineages in a TBX20-binding site-dependent manner. Endocardial Tbx20 conditional KO, ATAC-seq, TBX20 ChIP-seq, Hi-C chromatin loop maps, transgenic reporter assay with TBX20 binding site mutation Journal of Clinical Investigation High 27348591
2006 Tbx20 is required for tangential migration of facial motor neurons, lateral migration of trigeminal cells, and trans-median movement of vestibuloacoustic neurons. Facial cell migration defects were associated with coordinate downregulation of multiple planar cell polarity pathway components (Fzd7, Wnt11, Prickle1, Vang1, Vang2), identifying Tbx20 as a positive regulator of non-canonical Wnt signaling in these neurons. Conditional Tbx20-null mice (neuron-specific deletion), in situ hybridization, immunohistochemistry for PCP pathway components Development Medium 17119020
2013 Tbx20 directly regulates Esrra (estrogen-related receptor alpha) expression as determined by ChIP analysis; Tbx20 overexpression reduces H2O2-induced cardiomyocyte apoptosis via inhibition of p38MAPK, Bax, and caspase3 and activation of Bcl-2. Estrogen upregulates Tbx20 expression to mediate cardioprotection. ChIP assay for Tbx20 binding to Esrra locus, Tbx20 overexpression/knockdown in neonatal rat cardiomyocytes and H9c2 cells, Western blot for apoptotic markers International Journal of Cardiology Medium 23871353
2011 MKLN1 (muskelin) directly binds the T-box DNA-binding domain of TBX20b isoform (but not other TBX20 isoforms) via its kelch repeats domain; the two proteins co-localize primarily in the cytoplasm when co-transfected. The interaction was identified by yeast two-hybrid screening of embryonic mouse heart cDNA library. Yeast two-hybrid screen, domain-mapping in mammalian cells, immunofluorescence colocalization, immunohistochemistry in embryonic mouse hearts Biochemical and Biophysical Research Communications Medium 21586270
2020 TBX20 colocalizes with MEF2C, GATA4, and TBX5 (MGT) at cardiac gene enhancers associated with heart contraction in human iPSC-derived cardiomyocytes, promotes chromatin binding and co-occupancy of MGT factors at these loci, and synergizes for more robust activation of target gene transcription. Mechanistically shown by ChIP-seq and ATAC-seq. Transcriptomic comparison, ChIP-seq, ATAC-seq, human direct cardiac reprogramming, functional assays (contractility, calcium oscillation, mitochondrial respiration) Circulation High 36102189
2020 Tbx20 induction in adult zebrafish myocardium promotes cardiomyocyte dedifferentiation (loss of cellular contacts, re-expression of fetal gene programs) and non-cell-autonomously induces endocardial Bmp6 signaling. Pharmacological inhibition of endocardial Bmp6 attenuates endocardial regeneration in tbx20-overexpressing hearts. Adult zebrafish cardiac injury models, cardiomyocyte-specific Tbx20 overexpression, pharmacological Bmp6 inhibition, Id1/Id2b expression analysis Frontiers in Cell and Developmental Biology Medium 32850848
2008 TFAP2 transcription factors function as repressors of the TBX20 gene in vitro and in vivo through functional binding sites within a 100 bp core promoter region of human TBX20; decreased TFAP2C levels were found in cardiac biopsies of TOF patients. TBX20 promoter luciferase reporter assay, identification of TFAP2 binding sites, in vivo validation in cardiac biopsies Journal of Cellular Biochemistry Medium 18275040
2022 TBX20 suppresses colorectal cancer cell proliferation by impairing non-homologous end joining (NHEJ)-mediated DNA double-strand break repair via direct binding to the middle domains of both Ku70 and Ku80, inhibiting their recruitment to chromatin. PDZRN3 was identified as the E3 ubiquitin ligase mediating TBX20 ubiquitination and degradation. Co-immunoprecipitation with Ku70/Ku80 domain mapping, chromatin fractionation, NHEJ repair assay, ubiquitination assay identifying PDZRN3 as E3 ligase Cancer Science Medium 35348274
2023 ER stress upregulates Tbx20 via the ATF6 arm of the unfolded protein response; Tbx20 in turn activates downstream BMP2-pSmad1/5/8 signaling to induce cardiomyocyte proliferation and limit apoptosis. Administration of recombinant Bmp2 further upregulates Tbx20, establishing a feed-forward loop. ER stress induction in neonatal rat cardiomyocytes and in vivo, ATF6 pathway inhibition, Tbx20 cardiomyocyte-specific conditional KO, recombinant Bmp2 rescue experiment, Western blot for pSmad1/5/8 Journal of Biological Chemistry Medium 36805334
2023 TBX20 mutations p.His232Arg and p.Asp288His reduce transactivation of the KCNH2 target gene and impair binding to the KCNH2 promoter without affecting nuclear distribution of TBX20; these mutations co-segregate with atrial fibrillation and map to a new AF locus at chromosome 7p14.2-p14.3. Linkage analysis, exome sequencing, Sanger sequencing, dual-luciferase reporter assay, promoter-binding assay Biology Medium 37759586
2023 Disruption of the Tbx20-TLE interaction (via EH1 domain two-amino-acid substitution knock-in mouse) impairs cardiac looping and chamber formation, with transcriptional profiling revealing misexpression of the retinoic acid pathway and cardiac progenitor genes in the second heart field. EH1 domain knock-in mouse model (two amino acid substitution disrupting TLE interaction), RNA-seq transcriptional profiling, cardiac morphology analysis Development High 37756602
2020 Tbx20 directly activates Hey2 expression in embryonic mouse ventricles through a distal enhancer; mutation/deletion of conserved T-box binding sites in the enhancer abolishes activity, and Tbx20 null mice completely lose the enhancer activity. Luciferase assays show Tbx20 controls enhancer activity through DNA binding and cooperative function with cardiac Gata proteins. Enhancer deletion mouse model, Tbx20 null mouse enhancer analysis, luciferase reporter assays with T-box and Gata binding site mutations Developmental Biology High 32035085
2025 In retinal ganglion cells, Tbx20 is expressed predominantly in M1, M2, M6 ipRGC subtypes and is required for their development; conditional deletion of Tbx20 causes failure of Tbx20-expressing cells to develop and downregulates Opn4 expression, establishing Tbx20 as a key downstream factor of Tbr2 in ipRGC subtype specification. Conditional Tbx20 deletion in retinal neurons (Tbr2-Cre), single-cell RNA-seq subtype profiling, Opn4 expression analysis bioRxiv (preprint)preprint Medium bio_10.1101_2025.04.29.651262

Source papers

Stage 0 corpus · 98 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2007 Mutations in cardiac T-box factor gene TBX20 are associated with diverse cardiac pathologies, including defects of septation and valvulogenesis and cardiomyopathy. American journal of human genetics 281 17668378
2005 Tbx20 dose-dependently regulates transcription factor networks required for mouse heart and motoneuron development. Development (Cambridge, England) 184 15843409
2005 Murine T-box transcription factor Tbx20 acts as a repressor during heart development, and is essential for adult heart integrity, function and adaptation. Development (Cambridge, England) 173 15843414
2005 Tbx20 is essential for cardiac chamber differentiation and repression of Tbx2. Development (Cambridge, England) 160 15901664
2016 Overexpression of Tbx20 in Adult Cardiomyocytes Promotes Proliferation and Improves Cardiac Function After Myocardial Infarction. Circulation 134 26841808
2011 Tbx20 regulates a genetic program essential to adult mouse cardiomyocyte function. The Journal of clinical investigation 119 22080862
2005 Tbx5 and Tbx20 act synergistically to control vertebrate heart morphogenesis. Development (Cambridge, England) 114 15634698
2004 Differential expression and function of Tbx5 and Tbx20 in cardiac development. The Journal of biological chemistry 107 14978031
2001 Cloning and expression analysis of the mouse T-box gene tbx20. Mechanisms of development 107 11118890
2009 A gain-of-function TBX20 mutation causes congenital atrial septal defects, patent foramen ovale and cardiac valve defects. Journal of medical genetics 101 19762328
2009 Tbx20 interacts with smads to confine tbx2 expression to the atrioventricular canal. Circulation research 95 19661464
2008 Transcription factor neuromancer/TBX20 is required for cardiac function in Drosophila with implications for human heart disease. Proceedings of the National Academy of Sciences of the United States of America 77 19074289
2006 T-Box transcription factor Tbx20 regulates a genetic program for cranial motor neuron cell body migration. Development (Cambridge, England) 73 17119020
2000 tbx20, a new vertebrate T-box gene expressed in the cranial motor neurons and developing cardiovascular structures in zebrafish. Mechanisms of development 72 10906473
2013 Tbx20 promotes cardiomyocyte proliferation and persistence of fetal characteristics in adult mouse hearts. Journal of molecular and cellular cardiology 67 23751911
2005 Neuromancer Tbx20-related genes (H15/midline) promote cell fate specification and morphogenesis of the Drosophila heart. Developmental biology 66 15733676
2013 Tbx20 acts upstream of Wnt signaling to regulate endocardial cushion formation and valve remodeling during mouse cardiogenesis. Development (Cambridge, England) 65 23824573
2008 T-box transcription factor TBX20 mutations in Chinese patients with congenital heart disease. European journal of medical genetics 64 18834961
2005 Tbx20-related genes, mid and H15, are required for tinman expression, proper patterning, and normal differentiation of cardioblasts in Drosophila. Mechanisms of development 60 15922573
2022 TBX20 Improves Contractility and Mitochondrial Function During Direct Human Cardiac Reprogramming. Circulation 59 36102189
2012 Dual transcriptional activator and repressor roles of TBX20 regulate adult cardiac structure and function. Human molecular genetics 56 22328084
2018 Tbx20 Is Required in Mid-Gestation Cardiomyocytes and Plays a Central Role in Atrial Development. Circulation research 52 29903739
2011 Tbx20 regulation of cardiac cell proliferation and lineage specialization during embryonic and fetal development in vivo. Developmental biology 52 22226977
2008 Characterization of TBX20 in human hearts and its regulation by TFAP2. Journal of cellular biochemistry 52 18275040
2011 Tbx20 transcription factor is a downstream mediator for bone morphogenetic protein-10 in regulating cardiac ventricular wall development and function. The Journal of biological chemistry 49 21890625
2010 The BMP pathway acts to directly regulate Tbx20 in the developing heart. Development (Cambridge, England) 49 20460370
2011 Myocardial Tbx20 regulates early atrioventricular canal formation and endocardial epithelial-mesenchymal transition via Bmp2. Developmental biology 46 21983003
2017 TBX20 loss-of-function mutation responsible for familial tetralogy of Fallot or sporadic persistent truncus arteriosus. International journal of medical sciences 45 28553164
2021 The Role of Tbx20 in Cardiovascular Development and Function. Frontiers in cell and developmental biology 43 33585493
2018 TBX20 Regulates Angiogenesis Through the Prokineticin 2-Prokineticin Receptor 1 Pathway. Circulation 42 29545372
2000 Characterization of the human TBX20 gene, a new member of the T-Box gene family closely related to the Drosophila H15 gene. Genomics 40 10936053
2001 Expression pattern of novel chick T-box gene, Tbx20. Development genes and evolution 38 11862462
2015 TBX20 loss-of-function mutation contributes to double outlet right ventricle. International journal of molecular medicine 37 25625280
2016 TBX20 loss-of-function mutation associated with familial dilated cardiomyopathy. Clinical chemistry and laboratory medicine 36 26118961
2002 Developmental expression of the Xenopus laevis Tbx20 orthologue. Development genes and evolution 35 12536325
2013 A Gro/TLE-NuRD corepressor complex facilitates Tbx20-dependent transcriptional repression. Journal of proteome research 34 24024827
2017 Tbx20 controls the expression of the KCNH2 gene and of hERG channels. Proceedings of the National Academy of Sciences of the United States of America 31 28049825
2016 Tbx20 drives cardiac progenitor formation and cardiomyocyte proliferation in zebrafish. Developmental biology 29 27940156
2019 Copy number variation analysis in bicuspid aortic valve-related aortopathy identifies TBX20 as a contributing gene. European journal of human genetics : EJHG 28 30820038
2010 Elevated glucose induces congenital heart defects by altering the expression of tbx5, tbx20, and has2 in developing zebrafish embryos. Birth defects research. Part A, Clinical and molecular teratology 28 20306498
2009 The Tbx20 homologs midline and H15 specify ventral fate in the Drosophila melanogaster leg. Development (Cambridge, England) 28 19605497
2006 Developmental expression patterns of Tbx1, Tbx2, Tbx5, and Tbx20 in Xenopus tropicalis. Developmental dynamics : an official publication of the American Association of Anatomists 28 16477648
2017 Formation of a TBX20-CASZ1 protein complex is protective against dilated cardiomyopathy and critical for cardiac homeostasis. PLoS genetics 26 28945738
2016 A novel TBX20 loss‑of‑function mutation contributes to adult‑onset dilated cardiomyopathy or congenital atrial septal defect. Molecular medicine reports 26 27510170
2004 Expression of tbx20 RNA during chick heart development. Developmental dynamics : an official publication of the American Association of Anatomists 25 15188442
2016 Probing chromatin landscape reveals roles of endocardial TBX20 in septation. The Journal of clinical investigation 23 27348591
2009 Conformational stability and DNA binding specificity of the cardiac T-box transcription factor Tbx20. Journal of molecular biology 23 19414016
2020 Tbx20 Induction Promotes Zebrafish Heart Regeneration by Inducing Cardiomyocyte Dedifferentiation and Endocardial Expansion. Frontiers in cell and developmental biology 21 32850848
2016 Role of cardiac TBX20 in dilated cardiomyopathy. Molecular and cellular biochemistry 19 26895318
2014 A novel variant in TBX20 (p.D176N) identified by whole-exome sequencing in combination with a congenital heart disease related gene filter is associated with familial atrial septal defect. Journal of Zhejiang University. Science. B 19 25183037
2013 Tbx20 functions as an important regulator of estrogen-mediated cardiomyocyte protection during oxidative stress. International journal of cardiology 18 23871353
2012 Genetic analysis of the TBX20 gene promoter region in patients with ventricular septal defects. Gene 18 22465533
2022 TBX20 inhibits colorectal cancer tumorigenesis by impairing NHEJ-mediated DNA repair. Cancer science 17 35348274
2019 DNA methylation status of TBX20 in patients with tetralogy of Fallot. BMC medical genomics 17 31138201
2015 Novel mutations in the transcriptional activator domain of the human TBX20 in patients with atrial septal defect. BioMed research international 16 25834824
2010 Amphioxus Tbx6/16 and Tbx20 embryonic expression patterns reveal ancestral functions in chordates. Gene expression patterns : GEP 16 21185952
2016 Tbx20 Is an Essential Regulator of Embryonic Heart Growth in Zebrafish. PloS one 15 27907103
2020 Expression of Hey2 transcription factor in the early embryonic ventricles is controlled through a distal enhancer by Tbx20 and Gata transcription factors. Developmental biology 14 32035085
2012 The Tbx20 homolog Midline represses wingless in conjunction with Groucho during the maintenance of segment polarity. Developmental biology 14 22814213
2010 Tbx20, Smads, and the atrioventricular canal. Trends in cardiovascular medicine 14 21335279
2018 Cardiomyogenic differentiation of human adipose-derived mesenchymal stem cells transduced with Tbx20-encoding lentiviral vectors. Journal of cellular biochemistry 13 29637615
2023 ER stress induces upregulation of transcription factor Tbx20 and downstream Bmp2 signaling to promote cardiomyocyte survival. The Journal of biological chemistry 12 36805334
2021 The Double Mutation DSG2-p.S363X and TBX20-p.D278X Is Associated with Left Ventricular Non-Compaction Cardiomyopathy: Case Report. International journal of molecular sciences 12 34202524
2011 Characterization of the novel interaction between muskelin and TBX20, a critical cardiogenic transcription factor. Biochemical and biophysical research communications 12 21586270
2014 Association of TBX20 gene polymorphism with congenital heart disease in Han Chinese neonates. Pediatric cardiology 11 25487630
2018 Association between the promoter methylation of the TBX20 gene and tetralogy of fallot. Scandinavian cardiovascular journal : SCJ 10 30084275
2024 Role of TBX20 Truncating Variants in Dilated Cardiomyopathy and Left Ventricular Noncompaction. Circulation. Genomic and precision medicine 8 38353104
2023 Discovery of TBX20 as a Novel Gene Underlying Atrial Fibrillation. Biology 7 37759586
2021 TBX20 Contributes to Balancing the Differentiation of Perivascular Adipose-Derived Stem Cells to Vascular Lineages and Neointimal Hyperplasia. Frontiers in cell and developmental biology 7 34150759
2016 Lack of Genetic Interaction between Tbx18 and Tbx2/Tbx20 in Mouse Epicardial Development. PloS one 7 27253890
2023 Screening and evaluation of TBX20 and CITED2 mutations in children with congenital cardiac septal defects: Correlation with cardiac troponin T and caspase-3. Gene 6 37481008
2012 In vitro site selection of a consensus binding site for the Drosophila melanogaster Tbx20 homolog midline. PloS one 6 23133562
2023 Epigenetic Evaluation of the TBX20 Gene and Environmental Risk Factors in Mexican Paediatric Patients with Congenital Septal Defects. Cells 5 36831251
2019 Genetic Variants at the rs4720169 Locus of TBX20 and the rs12921862 Locus of AXIN1 May Increase the Risk of Congenital Heart Defects in the Mexican Population: A Pilot Study. Genetic testing and molecular biomarkers 5 31524541
2016 Mild decrease in TBX20 promoter activity is a potentially protective factor against congenital heart defects in the Han Chinese population. Scientific reports 5 27034249
2024 TBX20 loss-of-function variants in families with left ventricular non-compaction cardiomyopathy. Journal of medical genetics 4 37657916
2024 Genetic and functional variants of the TBX20 gene promoter in dilated cardiomyopathy. Molecular genetics & genomic medicine 4 38284443
2016 Relationship between TBX20 gene polymorphism and congenital heart disease. Genetics and molecular research : GMR 4 27323105
2024 Effect of Intramyocardial Administration of Baculovirus Encoding the Transcription Factor Tbx20 in Sheep With Experimental Acute Myocardial Infarction. Journal of the American Heart Association 3 39028008
2017 Association Analysis of Nonsyndromic Congenital Heart Disease and Tag Single Nucleotide Polymorphisms of TBX20 and Genes in the Ras-MAPK Pathway. Genetic testing and molecular biomarkers 3 28525297
2013 Lack of genetic interaction between Tbx20 and Tbx3 in early mouse heart development. PloS one 3 23936153
2025 Exploring genetic mapping and co-expression patterns to illuminate significance of Tbx20 in cardiac biology. Transgenic research 2 39777589
2025 Chromosomal Location and Identification of TBX20 as a New Gene Responsible for Familial Bicuspid Aortic Valve. Diagnostics (Basel, Switzerland) 2 40075846
2024 Generation of a TBX20 homozygous knockout stem cell line (WAe009-A-1E) by episomal vector-based CRISPR/Cas9 system. Stem cell research 2 38479330
2023 The Tbx20-TLE interaction is essential for the maintenance of the second heart field. Development (Cambridge, England) 2 37756602
2022 A novel de novo TBX20 variant in a 6-year-old Chinese girl with left ventricular noncompaction: a case report. Translational pediatrics 2 35282022
2025 β-Sitosterol as an Anti-Tumour Active Component of Herba Sarcandrae Inhibits Colorectal Cancer Progression Through Up-Regulation of TBX20. Journal of cellular and molecular medicine 1 40889204
2025 MiR-101-3p Promotes Cardiac Senescence and Inflammation via Targeting Tbx20 and Bmp2 to Perturb Cardiac Homeostasis. Journal of cellular physiology 1 41413924
2024 The Role of TBX20 Gene Mutations in the Pathogenesis of Congenital Heart Disease: Functional Analysis and Genetic Association Study. Cardiology 1 39681102
2015 [Association between Tbx20 gene polymorphism and congenital atrial septal defects]. Zhonghua nei ke za zhi 1 26675025
2026 TBX20 regulates epithelial-mesenchymal transition, maintains tumor stemness and immune factor expression, and promotes immune escape in lung cancer. Oncology letters 0 41993851
2026 Tbx20 and Sirt1 synergize to ameliorate cardiac aging through enhanced autophagy. Tissue & cell 0 42235376
2025 Enhanced BMP signaling in cranial neural crest cells induces aberrant chondrogenesis by upregulating Tbx20 expression during craniofacial development. Biochemical and biophysical research communications 0 40273622
2025 Variable Intrafamilial Cardiac Phenotype Segregating With a TBX20 Missense Variant in the Putative Transcriptional Activation Domain. American journal of medical genetics. Part A 0 40719322
2025 Structural and functional assessment of TBX20 gene variants in pediatric ventricular septal defect. Hereditas 0 40760458
2023 Generation of a TBX20-knockout human embryonic stem line by CRISPR/Cas9 system. Stem cell research 0 36963213
2019 [TBX20 - an important target gene for the prevention and treatment of cardiovascular diseases]. Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics 0 31030447
2018 [Role of Tbx20 gene in the development of cardiac valves]. Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics 0 30512176

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