Expression data of murine GPI-deficient bone marrow cells in a mouse model of targeted Pig-a deletion
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE14561 | GEO | 2009/09/10
SECONDARY ACCESSION(S): PRJNA111741
REPOSITORIES: GEO
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Project description:Somatic mutation in the X-linked phosphatidylinositol glycan class A (PIG-A) gene causes glycosylphosphatidylinositol (GPI) anchor deficiency in humans with Paroxysmal Nocturnal Hemoglobinuria (PNH). Clinically, patients with PNH have intravascular hemolysis, venous thrombosis and bone marrow failure. We produced a conditional Pig-a knock-out mouse model specifically inactivating the Pig-a gene in hematopoietic cells to study the role of PIG-A deficiency in PNH pathophysiology. We used Affymetrix Mouse Genome 430 2.0 chips to investigate the gene expression pattern in the mouse model of targeted Pig-a deletion. Experiment Overall Design: We performed microarray analysis on 3 pools of sorted GPI-deficient (GPI-) and GPI normal (GPI+) bone marrow cells derived from the same Pig-a knock-out animals, and identified 1275/669 genes of the 45,101 transcripts potentially available for screening using 2-fold change, <10% false discovery rate (FDR) and percentage of present calls as selection criteria. The major representative genes belong to the category of immune response. We tested whether the molecular differences between GPI- and GPI+ bone marrow cells could be preserved when GPI- cells were transplanted in lethally-irradiated wild type mice (C57BL/6). Microarray analysis was performed using sorted bone marrow cells from 4 animals transplanted with GPI-deficient bone marrow cells (T-GPI-) from Pig-a knock-out donors, 3 animals transplanted with GPI-normal bone marrow cells from C57BL/6 donors (T-GPI+), and GPI-normal bone marrow cells from 4 wild-type C57BL/6 mice (WT-GPI+). We found 296 probesets with 2-fold change cutoff, of which T-GPI- cells had 145 up-regulated genes in comparison to WT-GPI+ cells, and had 123 genes differentially expressed when compared to T-GPI+ cells. The gene expression of the GPI-deficient cells was very similar between the two sets of microarray experiments affirming the maintenance of the phenotype before and after bone marrow cell transplantation.
2009-09-18 | E-GEOD-14561 | biostudies-arrayexpress
Project description:To clarify the selective advantage of the GPI-AP- cells in paroxysmal nocturnal hemoglobinuria (PNH) patients, RNA-seq was applied to examine functional effects of the PIG-A mutation in human granulocytes.
2016-04-09 | GSE80062 | GEO
Project description:Overexpression of high mobility group AT-hook 2 (HMGA2) associated with truncations of its 3’ untranslated region (UTR) with let-7 micro RNA-complementary sequences have been identified in patients with paroxysmal nocturnal hemoglobinuria (PNH). Here, we generated transgenic mice (∆Hmga2 mice) with a 3’UTR-trncated Hmga2 cDNA that overexpress Hmga2 mRNA and protein in hematopoietic organs. ∆Hmga2 mice showed proliferative hematopoiesis that mimicked a myeloproliferative neoplasm (MPN)-like phenotype with increased numbers of all lineages of peripheral blood cells, hypercellular bone marrow (BM), splenomegaly with extramedullary erythropoiesis, and erythropoietin-independent erythroid colony formation compared to wild-type mice. ∆Hmga2 BM-derived cells took over most of hematopoiesis in competitive repopulations during serial BM transplants. When we bred mice with circulating PNH cells (Piga- mice) with ∆Hmga2 mice, the lack of GPI-linked proteins did not add an additional clonal advantage to the ∆Hmga2+ cells. In summary, our results showed that the overexpression of a 3’UTR-truncated Hmga2 leads to a proliferative hematopoiesis with clonal advantage, which may explain clonal expansion in PNH or MPN at the level of HSC. Eight independent preparations of RNA, which included each 2 samples of KLS cells and MEP cells from ∆Hmga2 mice and 2 each from WT mice. Each preparation was made from 4 or 6 mice.
2011-02-06 | E-GEOD-24071 | biostudies-arrayexpress
Project description:Overexpression of high mobility group AT-hook 2 (HMGA2) associated with truncations of its 3’ untranslated region (UTR) with let-7 micro RNA-complementary sequences have been identified in patients with paroxysmal nocturnal hemoglobinuria (PNH). Here, we generated transgenic mice (∆Hmga2 mice) with a 3’UTR-trncated Hmga2 cDNA that overexpress Hmga2 mRNA and protein in hematopoietic organs. ∆Hmga2 mice showed proliferative hematopoiesis that mimicked a myeloproliferative neoplasm (MPN)-like phenotype with increased numbers of all lineages of peripheral blood cells, hypercellular bone marrow (BM), splenomegaly with extramedullary erythropoiesis, and erythropoietin-independent erythroid colony formation compared to wild-type mice. ∆Hmga2 BM-derived cells took over most of hematopoiesis in competitive repopulations during serial BM transplants. When we bred mice with circulating PNH cells (Piga- mice) with ∆Hmga2 mice, the lack of GPI-linked proteins did not add an additional clonal advantage to the ∆Hmga2+ cells. In summary, our results showed that the overexpression of a 3’UTR-truncated Hmga2 leads to a proliferative hematopoiesis with clonal advantage, which may explain clonal expansion in PNH or MPN at the level of HSC.
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Project description:Tissue inhibitor of metalloproteinase 1 (TIMP-1) controls matrix metalloproteinase (MMP) activity through 1:1 stochiometric binding. Human TIMP-1 fused to a glycosylphosphatidylinositol (GPI) anchor (TIMP-1-GPI) shifts the activity of TIMP-1 from the extracellular matrix to the cell surface. TIMP-1-GPI treated renal cell carcinoma cells (RCC) show increased apoptosis and reduced proliferation. Transcriptomic profiling and regulatory pathway mapping were used to identify potential mechanisms driving these effects. Significant changes in inhibitor of DNA binding (IDs), TGF-β1/SMAD and BMP pathways resulted from TIMP-1-GPI treatment. These events were linked to reduced TGF-β1 signaling mediated by inhibition of proteolytic processing of latent TGF-β1 by TIMP-1-GPI. Activity of TIMP-1 from the extracellular matrix to the cell surface. TIMP-1-GPI treated renal cell carcinoma cells (RCC) show increased apoptosis and reduced proliferation. Transcriptomic profiling and regulatory pathway mapping were used to identify potential mechanisms driving these effects. Significant changes in inhibitor of DNA binding (IDs), TGF-β1/SMAD and BMP pathways resulted from TIMP-1-GPI treatment. These events were linked to reduced TGF-β1 signaling mediated by inhibition of proteolytic processing of latent TGF-β1 by TIMP-1-GPI.
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Project description:Histone methyltransferases catalyze site-specific deposition of methyl groups, enabling recruitment of transcriptional regulators. In mammals, trimethylation of lysine 4 in histone H3, a modification localized at the transcription start sites of active genes, is catalyzed by six enzymes (SET1a and SET1b, MLL1M-bM-^@M-^SMLL4) whose specific functions are largely unknown. By using a genomic approach, we found that in macrophages, MLL4 (also known as Wbp7) was required for the expression of Pigp, an essential component of the GPI-GlcNAc transferase, the enzyme catalyzing the first step of glycosylphosphatidylinositol (GPI) anchor synthesis. Impaired Pigp expression in Wbp7-/- macrophages abolished GPI anchor-dependent loading of proteins on the cell membrane. Consistently, loss of GPI-anchored CD14, the coreceptor for lipopolysaccharide (LPS) and other bacterial molecules, markedly attenuated LPS-triggered intracellular signals and gene expression changes. These data link a histone-modifying enzyme to a biosynthetic pathway and indicate a specialized biological role for Wbp7 in macrophage function and antimicrobial response. Gene expression profiles for bone marrow-derived macrophages (BMDM) from either Wbp7+/- (HET) or Wbp7-/- (KO). Cells were left untreated or challenged with lipopolysaccharide (LPS) for 2hrs or 4hrs. Each genotype-treatment combination were performed in triplicate.
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Project description:Histone methyltransferases catalyze site-specific deposition of methyl groups, enabling recruitment of transcriptional regulators. In mammals, trimethylation of lysine 4 in histone H3, a modification localized at the transcription start sites of active genes, is catalyzed by six enzymes (SET1a and SET1b, MLL1M-bM-^@M-^SMLL4) whose specific functions are largely unknown. By using a genomic approach, we found that in macrophages, MLL4 (also known as Wbp7) was required for the expression of Pigp, an essential component of the GPI-GlcNAc transferase, the enzyme catalyzing the first step of glycosylphosphatidylinositol (GPI) anchor synthesis. Impaired Pigp expression in Wbp7-/- macrophages abolished GPI anchor-dependent loading of proteins on the cell membrane. Consistently, loss of GPI-anchored CD14, the coreceptor for lipopolysaccharide (LPS) and other bacterial molecules, markedly attenuated LPS-triggered intracellular signals and gene expression changes. These data link a histone-modifying enzyme to a biosynthetic pathway and indicate a specialized biological role for Wbp7 in macrophage function and antimicrobial response. Chromatin immuno-precipitations of H3 histone try-methylated on lysine 4 followed by multiparallel sequencing performed in murine bone marrow-derive macrophages (BMDM). Experiments carried out in untreated cells as well as in cells treated for 4hrs with lipopolysaccharide (LPS), for both Wbp7+/- (HET) and Wbp7-/- (KO) mice.
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Project description:Histone methyltransferases catalyze site-specific deposition of methyl groups, enabling recruitment of transcriptional regulators. In mammals, trimethylation of lysine 4 in histone H3, a modification localized at the transcription start sites of active genes, is catalyzed by six enzymes (SET1a and SET1b, MLL1–MLL4) whose specific functions are largely unknown. By using a genomic approach, we found that in macrophages, MLL4 (also known as Wbp7) was required for the expression of Pigp, an essential component of the GPI-GlcNAc transferase, the enzyme catalyzing the first step of glycosylphosphatidylinositol (GPI) anchor synthesis. Impaired Pigp expression in Wbp7-/- macrophages abolished GPI anchor-dependent loading of proteins on the cell membrane. Consistently, loss of GPI-anchored CD14, the coreceptor for lipopolysaccharide (LPS) and other bacterial molecules, markedly attenuated LPS-triggered intracellular signals and gene expression changes. These data link a histone-modifying enzyme to a biosynthetic pathway and indicate a specialized biological role for Wbp7 in macrophage function and antimicrobial response.
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