Gene Regulation by HDAC7 in Thymic Selection
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE7468 | GEO | 2007/11/04
SECONDARY ACCESSION(S): PRJNA100267
REPOSITORIES: GEO
Similar Datasets
Project description:Abstract of publicaton: CD4/CD8 double-positive (DP) thymocytes express the transcriptional repressor Histone Deacetylase 7 (HDAC7), a class IIa HDAC that is exported from the cell nucleus after T cell receptor (TCR) engagement. Through signal-dependent nuclear export, class IIa HDACs such as HDAC7 mediate signal-dependent changes in gene expression that are important to developmental fate decisions in multiple tissues. We report that HDAC7 is exported from the cell nucleus during positive selection in thymocytes, and regulates genes mediating the coupling between TCR engagement and downstream events that determine cell survival. Thymocytes lacking HDAC7 are inefficiently positively selected due to a severely shortened lifespan and exhibit a truncated repertoire of TCR Jalpha segments. The expression of multiple important mediators and modulators of the response to TCR engagement is altered in HDAC7-deficient thymocytes, resulting in increased tonic MAP kinase activity that contributes to the observed loss of viability. Remarkably, the activity of Protein Kinase D, the kinase that mediates nuclear export of HDAC7 in response to TCR signaling, is also increased in HDAC7-deficient thymocytes, suggesting that HDAC7 nuclear export governs a self-sustaining auto-excitatory loop. These experiments add to the understanding of the life/death decision in thymic T cell development, define a novel function for class IIa HDACs, and point to a novel feed-forward mechanism whereby these molecules regulate their own state and mediate stable developmental transitions. Title of manuscript: Nuclear Export of Histone Deacetylase 7 During Thymic Selection Mediates Immune Self-tolerance. abstract of manuscript: Histone Deacetylase 7 (HDAC7) is a TCR signal-dependent regulator of differentiation that is highly expressed in CD4/CD8 double-positive (DP) thymocytes. Here we examine the effect of blocking TCR-dependent nuclear export of HDAC7 during thymic selection, through expression of a signal-resistant mutant of HDAC7 (HDAC7-?P) in thymocytes. We find that HDAC7-?P Transgenic thymocytes exhibit a profound block in negative thymic selection, but can still undergo positive selection, resulting in the escape of autoreactive T cells into the periphery. Gene expression profiling reveals a comprehensive suppression of the negative selection-associated gene expression program in DP thymocytes, associated with a defect in the activation of MAP kinase pathways by TCR signals. The consequence of this block in vivo is a lethal autoimmune syndrome involving the exocrine pancreas and other abdominal organs. These experiments establish a novel molecular model of autoimmunity and cast new light on the relationship between thymic selection and immune self-tolerance. Goal of Microarray experiment: We did these experiments to determine how alteration of the function of HDAC7, a site-specific and signal-dependent repressor of transcription, changes gene expression in CD4/CD8 DP thymocytes.
2011-04-06 | GSE26488 | GEO
Project description:Title of Publication: Histone Deacetylase 7 Regulates Cell Survival and TCR Signaling in CD4/CD8 Double-Positive Thymocytes Abstract of publicaton: CD4/CD8 double-positive (DP) thymocytes express the transcriptional repressor Histone Deacetylase 7 (HDAC7), a class IIa HDAC that is exported from the cell nucleus after T cell receptor (TCR) engagement. Through signal-dependent nuclear export, class IIa HDACs such as HDAC7 mediate signal-dependent changes in gene expression that are important to developmental fate decisions in multiple tissues. We report that HDAC7 is exported from the cell nucleus during positive selection in thymocytes, and regulates genes mediating the coupling between TCR engagement and downstream events that determine cell survival. Thymocytes lacking HDAC7 are inefficiently positively selected due to a severely shortened lifespan and exhibit a truncated repertoire of TCR J segments. The expression of multiple important mediators and modulators of the response to TCR engagement is altered in HDAC7-deficient thymocytes, resulting in increased tonic MAP kinase activity that contributes to the observed loss of viability. Remarkably, the activity of Protein Kinase D, the kinase that mediates nuclear export of HDAC7 in response to TCR signaling, is also increased in HDAC7-deficient thymocytes, suggesting that HDAC7 nuclear export governs a self-sustaining auto-excitatory loop. These experiments add to the understanding of the life/death decision in thymic T cell development, define a novel function for class IIa HDACs, and point to a novel feed-forward mechanism whereby these molecules regulate their own state and mediate stable developmental transitions. Goal of Microarray experiment: We did these experiments to determine how alteration of the function of HDAC7, a site-specific and signal-dependent repressor of transcription, changes gene expression in CD4/CD8 DP thymocytes. Three biological replicate samples were prepared for each non-wild type mouse strain (Samples 7-18). Six biological replicates were prepared for the wild type strain (Samples 1-6). Total RNA was prepared from isolated CD4/CD8 Double-positive thymocytes and labeled with the Affymetrix Whole-Transcript labeling protocol. Labeled probes were hybridized to one Affymetrix Mouse Gene 1.0ST array each. Data from .cel files were normalized using RMA, in normalization groups representing each of the binary comparisons made. These binary comparisons between sample groups represent gene expression changes due to loss of HDAC7 (samples 1-3 vs. 7-9), transgenic expression of an HDAC7-VP16 fusion protein (samples 4-6 vs. 10-12), positive thymic selection (samples 1-6 vs. samples 11-15), and negative thymic selection (Samples 11-15 vs. samples 16-18).
2011-04-06 | E-GEOD-26488 | biostudies-arrayexpress
Project description:Epigenetics and Alternative Splicing are both critical mechanisms guiding gene expression. Several studies have demonstrated that epigenetic marks can influence alternative splicing decisions, but less is known about how alternative splicing may impact epigenetics. Here, we demonstrate that several genes encoding histone modifying enzymes are alternatively spliced downstream of T cell activation signaling pathways, including HDAC7, a gene previously implicated in controlling gene expression programs and differentiation in T cells. Using CRISPR-Cas9 gene editing and cDNA expression, we show that differential inclusion of HDAC7 exon 9 controls the interaction of HDAC7 with protein chaperones with resulting impact on histone modifications and gene expression. Notably, the long isoform, which is favored upon JNK signaling, promotes expression of several critical T cell surface proteins including CD3, CD28, CD69. Thus, we demonstrate that alternative splicing of HDAC7 has a global impact on epigenetics and gene expression, and may contribute to T cell regulation.
2023-02-18 | PXD036471 | Pride
Project description:The present study reports an unbiased analysis of the cytotoxic T cell serine-threonine phosphoproteome using high resolution mass spectrometry. Approximately 2,000 phosphorylations were identified in CTLs of which approximately 450 were controlled by TCR signaling. A significantly overrepresented group of molecules identified in the phosphoproteomic screen were transcription activators, co-repressors and chromatin regulators. A focus on the chromatin regulators revealed that CTLs have high expression of the histone deacetylase HDAC7 but continually phosphorylate and export this transcriptional repressor from the nucleus. HDAC7 dephosphorylation results in its nuclear accumulation and suppressed expression of genes encoding key cytokines, cytokine receptors and adhesion molecules that determine CTL function. The screening of the CTL phosphoproteome thus reveals intrinsic pathways of serine-threonine phosphorylation that target chromatin regulators in CTLs and determine the CTL functional program. We used Affymetrix microarray analysis to explore the molecular basis for the role of HDAC7 in CTLs and the impact of GFP-HDAC7 phosphorylation deficient mutant expression on the CTL transcriptional profile. In vitro generated P14 TCR cytotoxic T cells were retrovirally infected with a construct encoding GFP-HDAC7 phosphorylation deficient mutant, sorted in base of GFP expression (GFP positive and GFP negative) and processed for microarray analysis in three biological replicas.
2011-03-13 | E-GEOD-27092 | biostudies-arrayexpress
Project description:The establishment of proper epigenomic landscape is essential during B lymphocyte development in order to acquire a correct B cell identity at each cellular differentiation stage. We previously identified HDAC7 as a critical regulator of early B cell development. Its absence indeed led to the aberrant activation of inappropriate lineage genes, a reduction of proliferation and an increase in cell apoptosis. More recently, we have demonstrated that HDAC7 loss in infant pro-B-ALL associates with poor prognosis. Here we shed light into the HDAC7-mediated molecular mechanisms during early B cell development. HDAC7 deficiency drives not only the expression of inappropriate lineage genes, but also global chromatin de-condensation and deregulation of epigenetic regulators of DNA methylation and potential damaging elements. Specifically, HDAC7 absence induces the expression of TET2, which promotes DNA 5-hydroxymethylation and aberrant gene activation. HDAC7 deficiency also results in the uncontrolled expression of microRNAs and non-coding elements such as LINE-1 transposable elements. These findings are relevant for the mechanistic explanation of why HDAC7 is affected in multiple B-related hematological malignancies. Chromatin immunoprecipitation DNA-sequencing (ChIP-seq) for histone modifications H3K27ac and H3K27me3 in murine pro-B lymphocytes.
2022-06-27 | GSE204673 | GEO
Project description:The establishment of proper epigenomic landscape is essential during B lymphocyte development in order to acquire a correct B cell identity at each cellular differentiation stage. We previously identified HDAC7 as a critical regulator of early B cell development. Its absence indeed led to the aberrant activation of inappropriate lineage genes, a reduction of proliferation and an increase in cell apoptosis. More recently, we have demonstrated that HDAC7 loss in infant pro-B-ALL associates with poor prognosis. Here we shed light into the HDAC7-mediated molecular mechanisms during early B cell development. HDAC7 deficiency drives not only the expression of inappropriate lineage genes, but also global chromatin de-condensation and deregulation of epigenetic regulators of DNA methylation and potential damaging elements. Specifically, HDAC7 absence induces the expression of TET2, which promotes DNA 5-hydroxymethylation and aberrant gene activation. HDAC7 deficiency also results in the uncontrolled expression of microRNAs and non-coding elements such as LINE-1 transposable elements. These findings are relevant for the mechanistic explanation of why HDAC7 is affected in multiple B-related hematological malignancies. Assay for Transposase-Accessible Chromatin with high-throughput sequencing (ATAC-seq) was performed in murine pro-B and pre-B lymphocytes.
2022-06-27 | GSE204672 | GEO
Project description:We analyzed the genome wide distributions of HDAC1, HDAC4, HDAC7 in Th17 cells. We find that majority of HDAC4 and HDAC7 binding sites are HDAC1 bound. TMP269 inhibits HDAC4 and HDAC7 at promoter sites of Th17 negative regulator genes, leading to their upregulation through increased H3, H4 acetylation.
2018-12-16 | GSE92531 | GEO
Project description:Microarray analysis of thymic deletion in the B10 mouse strain The gene expression patterns of thymocytes at the pre-selection stage and undergoing positive selection or negative selection were compared in the C57BL/10-H2k (B10k) strain. In order to sort thymocytes homogenously undergoing positive selection the 3A9 TCRHEL transgenic was used, which directs thymocyte development towards a MHC class II-restricted HEL-reactive lineage. To sort thymocytes homogenously undergoing negative selection, the 3A9 TCRHEL transgenic was crossed to the insHEL transgenic, which expresses HEL under the control of the insulin promoter in the thymic stroma, leading to efficient negative selection at the early single positive (CD4+CD8low) stage. To prepare the samples, thymic cell suspensions from female 6-8 week old B10k mice, either 3A9 TCRHEL or 3A9 TCRHEL x insHEL transgenics, were stained with CD4-FITC, CD69-PE, CD8-PerCP, and 1G12 supernatant (which recognises the 3A9 TCRHEL complex) followed by anti-IgG1-APC, and sorted. Pre-selection cells (from both transgenics) were defined as CD4+CD8+CD69-1G12low. Cells undergoing positive selection (from 3A9 TCRHEL transgenics) or negative selection (from 3A9 TCRHEL x insHEL transgenics) were defined as CD4+CD8lowCD69+1G12high. Keywords: repeat
2008-11-01 | GSE9700 | GEO
Project description:Correct B cell identity at each stage of cellular differentiation during B lymphocyte development is critically dependent on a tightly controlled epigenomic landscape. We previously identified HDAC7 as an essential regulator of early B cell development and its absence leads to a drastic block at the pro-B to pre-B cell transition. More recently, we demonstrated that HDAC7 loss in pro-B-ALL in infants associates with a worse prognosis. Here we delineate the molecular mechanisms by which HDAC7 modulates early B cell development. We find that HDAC7 deficiency drives global chromatin de-condensation, histone marks deposition and deregulates other epigenetic regulators and mobile elements. Specifically, the absence of HDAC7 induces TET2 expression, which promotes DNA 5-hydroxymethylation and chromatin de-condensation. HDAC7 deficiency also results in the aberrant expression of microRNAs and LINE-1 transposable elements. These findings shed light on the mechanisms by which HDAC7 loss or misregulation may lead to B cell–based hematological malignancies.
2022-06-27 | GSE171855 | GEO