Combined genomic and proteomic approaches reveal DNA binding sites and interaction partners of TBX2 in the developing lung

Abstract Background Tbx2 encodes a transcriptional repressor implicated in the development of numerous organs in mouse. During lung development TBX2 maintains the proliferation of mesenchymal progenitors, and hence, epithelial proliferation and branching morphogenesis. The pro-proliferative function...

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Main Authors: Timo H. Lüdtke, Irina Wojahn, Marc-Jens Kleppa, Jasper Schierstaedt, Vincent M. Christoffels, Patrick Künzler, Andreas Kispert
Format: Article
Language:English
Published: BMC 2021-03-01
Series:Respiratory Research
Subjects:
Online Access:https://doi.org/10.1186/s12931-021-01679-y
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author Timo H. Lüdtke
Irina Wojahn
Marc-Jens Kleppa
Jasper Schierstaedt
Vincent M. Christoffels
Patrick Künzler
Andreas Kispert
author_facet Timo H. Lüdtke
Irina Wojahn
Marc-Jens Kleppa
Jasper Schierstaedt
Vincent M. Christoffels
Patrick Künzler
Andreas Kispert
author_sort Timo H. Lüdtke
collection DOAJ
description Abstract Background Tbx2 encodes a transcriptional repressor implicated in the development of numerous organs in mouse. During lung development TBX2 maintains the proliferation of mesenchymal progenitors, and hence, epithelial proliferation and branching morphogenesis. The pro-proliferative function was traced to direct repression of the cell-cycle inhibitor genes Cdkn1a and Cdkn1b, as well as of genes encoding WNT antagonists, Frzb and Shisa3, to increase pro-proliferative WNT signaling. Despite these important molecular insights, we still lack knowledge of the DNA occupancy of TBX2 in the genome, and of the protein interaction partners involved in transcriptional repression of target genes. Methods We used chromatin immunoprecipitation (ChIP)-sequencing and expression analyses to identify genomic DNA-binding sites and transcription units directly regulated by TBX2 in the developing lung. Moreover, we purified TBX2 containing protein complexes from embryonic lung tissue and identified potential interaction partners by subsequent liquid chromatography/mass spectrometry. The interaction with candidate proteins was validated by immunofluorescence, proximity ligation and individual co-immunoprecipitation analyses. Results We identified Il33 and Ccn4 as additional direct target genes of TBX2 in the pulmonary mesenchyme. Analyzing TBX2 occupancy data unveiled the enrichment of five consensus sequences, three of which match T-box binding elements. The remaining two correspond to a high mobility group (HMG)-box and a homeobox consensus sequence motif. We found and validated binding of TBX2 to the HMG-box transcription factor HMGB2 and the homeobox transcription factor PBX1, to the heterochromatin protein CBX3, and to various members of the nucleosome remodeling and deacetylase (NuRD) chromatin remodeling complex including HDAC1, HDAC2 and CHD4. Conclusion Our data suggest that TBX2 interacts with homeobox and HMG-box transcription factors as well as with the NuRD chromatin remodeling complex to repress transcription of anti-proliferative genes in the pulmonary mesenchyme.
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spelling doaj.art-da418b249c7b4155b293e1e7ce76a75f2022-12-21T20:26:36ZengBMCRespiratory Research1465-993X2021-03-0122111710.1186/s12931-021-01679-yCombined genomic and proteomic approaches reveal DNA binding sites and interaction partners of TBX2 in the developing lungTimo H. Lüdtke0Irina Wojahn1Marc-Jens Kleppa2Jasper Schierstaedt3Vincent M. Christoffels4Patrick Künzler5Andreas Kispert6Institut Für Molekularbiologie, Medizinische Hochschule HannoverInstitut Für Molekularbiologie, Medizinische Hochschule HannoverInstitut Für Molekularbiologie, Medizinische Hochschule HannoverInstitut Für Molekularbiologie, Medizinische Hochschule HannoverDepartment of Anatomy, Embryology and Physiology, Academic Medical Center, University of AmsterdamInstitut Für Pflanzengenetik, Leibniz Universität HannoverInstitut Für Molekularbiologie, Medizinische Hochschule HannoverAbstract Background Tbx2 encodes a transcriptional repressor implicated in the development of numerous organs in mouse. During lung development TBX2 maintains the proliferation of mesenchymal progenitors, and hence, epithelial proliferation and branching morphogenesis. The pro-proliferative function was traced to direct repression of the cell-cycle inhibitor genes Cdkn1a and Cdkn1b, as well as of genes encoding WNT antagonists, Frzb and Shisa3, to increase pro-proliferative WNT signaling. Despite these important molecular insights, we still lack knowledge of the DNA occupancy of TBX2 in the genome, and of the protein interaction partners involved in transcriptional repression of target genes. Methods We used chromatin immunoprecipitation (ChIP)-sequencing and expression analyses to identify genomic DNA-binding sites and transcription units directly regulated by TBX2 in the developing lung. Moreover, we purified TBX2 containing protein complexes from embryonic lung tissue and identified potential interaction partners by subsequent liquid chromatography/mass spectrometry. The interaction with candidate proteins was validated by immunofluorescence, proximity ligation and individual co-immunoprecipitation analyses. Results We identified Il33 and Ccn4 as additional direct target genes of TBX2 in the pulmonary mesenchyme. Analyzing TBX2 occupancy data unveiled the enrichment of five consensus sequences, three of which match T-box binding elements. The remaining two correspond to a high mobility group (HMG)-box and a homeobox consensus sequence motif. We found and validated binding of TBX2 to the HMG-box transcription factor HMGB2 and the homeobox transcription factor PBX1, to the heterochromatin protein CBX3, and to various members of the nucleosome remodeling and deacetylase (NuRD) chromatin remodeling complex including HDAC1, HDAC2 and CHD4. Conclusion Our data suggest that TBX2 interacts with homeobox and HMG-box transcription factors as well as with the NuRD chromatin remodeling complex to repress transcription of anti-proliferative genes in the pulmonary mesenchyme.https://doi.org/10.1186/s12931-021-01679-yTbx2Pulmonary mesenchymeLung developmentNuRDHDACCBX3
spellingShingle Timo H. Lüdtke
Irina Wojahn
Marc-Jens Kleppa
Jasper Schierstaedt
Vincent M. Christoffels
Patrick Künzler
Andreas Kispert
Combined genomic and proteomic approaches reveal DNA binding sites and interaction partners of TBX2 in the developing lung
Respiratory Research
Tbx2
Pulmonary mesenchyme
Lung development
NuRD
HDAC
CBX3
title Combined genomic and proteomic approaches reveal DNA binding sites and interaction partners of TBX2 in the developing lung
title_full Combined genomic and proteomic approaches reveal DNA binding sites and interaction partners of TBX2 in the developing lung
title_fullStr Combined genomic and proteomic approaches reveal DNA binding sites and interaction partners of TBX2 in the developing lung
title_full_unstemmed Combined genomic and proteomic approaches reveal DNA binding sites and interaction partners of TBX2 in the developing lung
title_short Combined genomic and proteomic approaches reveal DNA binding sites and interaction partners of TBX2 in the developing lung
title_sort combined genomic and proteomic approaches reveal dna binding sites and interaction partners of tbx2 in the developing lung
topic Tbx2
Pulmonary mesenchyme
Lung development
NuRD
HDAC
CBX3
url https://doi.org/10.1186/s12931-021-01679-y
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