Molecular Signature of Erythroblast Enucleation in Human Embryonic Stem Cells
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE55531 | GEO | 2015/04/14
SECONDARY ACCESSION(S): PRJNA239884
REPOSITORIES: GEO
Similar Datasets
Project description:While enucleation is a critical step in the terminal differentiation of human red blood cells, the molecular mechanisms underlying this unique process remain unclear. To investigate erythroblast enucleation, we studied the erythroid differentiation of human embryonic stem cells (hESCs), which provide a unique model for deeper understanding of the development and differentiation of multiple cell types. First, using a two-step protocol, we demonstrated that terminal erythroid differentiation from hESCs is directly dependent on the age of the embryoid bodies. Second, by choosing hESCs in two extreme conditions of erythroid culture, we obtained an original differentiation model which allows one to study the mechanisms underlying the enucleation of erythroid cells by analyzing the gene and miRNA (miR) expression profiles of cells from these two culture conditions. Third, using an integrated analysis of mRNA and miR expression profiles, we identified five miRs potentially involved in erythroblast enucleation. Finally, by selective knockdown of these five miRs we found miR-30a to be a regulator of erythroblast enucleation in hESCs. Refer to individual Series
2015-04-14 | E-GEOD-55532 | biostudies-arrayexpress
Project description:While enucleation is a critical step in the terminal differentiation of human red blood cells, the molecular mechanisms underlying this unique process remain unclear. To investigate erythroblast enucleation, we studied the erythroid differentiation of human embryonic stem cells (hESCs), which provide a unique model for deeper understanding of the development and differentiation of multiple cell types. First, using a two-step protocol, we demonstrated that terminal erythroid differentiation from hESCs is directly dependent on the age of the embryoid bodies. Second, by choosing hESCs in two extreme conditions of erythroid culture, we obtained an original differentiation model which allows one to study the mechanisms underlying the enucleation of erythroid cells by analyzing the gene and miRNA (miR) expression profiles of cells from these two culture conditions. Third, using an integrated analysis of mRNA and miR expression profiles, we identified five miRs potentially involved in erythroblast enucleation. Finally, by selective knockdown of these five miRs we found miR-30a to be a regulator of erythroblast enucleation in hESCs.
2015-04-14 | GSE55532 | GEO
Project description:While enucleation is a critical step in the terminal differentiation of human red blood cells, the molecular mechanisms underlying this unique process remain unclear. To investigate erythroblast enucleation, we studied the erythroid differentiation of human embryonic stem cells (hESCs), which provide a unique model for deeper understanding of the development and differentiation of multiple cell types. First, using a two-step protocol, we demonstrated that terminal erythroid differentiation from hESCs is directly dependent on the age of the embryoid bodies. Second, by choosing hESCs in two extreme conditions of erythroid culture, we obtained an original differentiation model which allows one to study the mechanisms underlying the enucleation of erythroid cells by analyzing the gene and miRNA (miR) expression profiles of cells from these two culture conditions. Third, using an integrated analysis of mRNA and miR expression profiles, we identified five miRs potentially involved in erythroblast enucleation. Finally, by selective knockdown of these five miRs we found miR-30a to be a regulator of erythroblast enucleation in hESCs.
2015-04-14 | GSE55530 | GEO
Project description:While enucleation is a critical step in the terminal differentiation of human red blood cells, the molecular mechanisms underlying this unique process remain unclear. To investigate erythroblast enucleation, we studied the erythroid differentiation of human embryonic stem cells (hESCs), which provide a unique model for deeper understanding of the development and differentiation of multiple cell types. First, using a two-step protocol, we demonstrated that terminal erythroid differentiation from hESCs is directly dependent on the age of the embryoid bodies. Second, by choosing hESCs in two extreme conditions of erythroid culture, we obtained an original differentiation model which allows one to study the mechanisms underlying the enucleation of erythroid cells by analyzing the gene and miRNA (miR) expression profiles of cells from these two culture conditions. Third, using an integrated analysis of mRNA and miR expression profiles, we identified five miRs potentially involved in erythroblast enucleation. Finally, by selective knockdown of these five miRs we found miR-30a to be a regulator of erythroblast enucleation in hESCs. We compared the miRNA expression profles of sample groupe A (EB9) to sample goupe B (EB20). Microarray analysis was performed in triplicate for both sample groups at each time point: Day0, cells at the level of embryoid body (A-D0, B-D0) and Day18 of erythroid culture(A-D18, B-D18).
2015-04-14 | E-GEOD-55530 | biostudies-arrayexpress
Project description:While enucleation is a critical step in the terminal differentiation of human red blood cells, the molecular mechanisms underlying this unique process remain unclear. To investigate erythroblast enucleation, we studied the erythroid differentiation of human embryonic stem cells (hESCs), which provide a unique model for deeper understanding of the development and differentiation of multiple cell types. First, using a two-step protocol, we demonstrated that terminal erythroid differentiation from hESCs is directly dependent on the age of the embryoid bodies. Second, by choosing hESCs in two extreme conditions of erythroid culture, we obtained an original differentiation model which allows one to study the mechanisms underlying the enucleation of erythroid cells by analyzing the gene and miRNA (miR) expression profiles of cells from these two culture conditions. Third, using an integrated analysis of mRNA and miR expression profiles, we identified five miRs potentially involved in erythroblast enucleation. Finally, by selective knockdown of these five miRs we found miR-30a to be a regulator of erythroblast enucleation in hESCs. We compared the gene expression profles of sample groupe A (EB9) to sample goupe B (EB20). Microarray analysis was performed in triplicate for both sample groups at each time point: Day0, cells at the level of embryoid body (A-D0, B-D0) and Day18 of erythroid culture(A-D18, B-D18) , Twelve RNA samples were hybridized to 12 Agilent 4X44K Whole Human Genome Oligo microarrays one color.
2015-04-14 | E-GEOD-55531 | biostudies-arrayexpress
Project description:Terminal differentiation of mammalian erythroid progenitors involves 4-5 cell divisions and induction of many erythroid important genes, followed by chromatin and nuclear condensation and enucleation. The protein levels of c-myc (Myc) are reduced dramatically during late stage erythroid maturation, coinciding with cell cycle arrest in G1-phase and enucleation, suggesting possible roles for c-myc in either or both of these processes. Here we demonstrate that ectopic Myc expression affects terminal erythroid maturation in a dose-dependent manner. Expression of Myc at physiological levels did not affect erythroid differentiation or cell cycle shutdown, but specifically blocked erythroid nuclear condensation and enucleation. Myc prevented deacetylation of several lysine residues in histones H3 and H4 that are normally deacetylated during erythroid maturation. When over-expressed at levels higher than the physiological range, Myc blocked erythroid differentiation and the cells continued to proliferate in cytokine-free, serum-containing culture medium with an early erythroblast morphology. These studies reveal an important dose-dependent function of Myc in regulating terminal maturation in mammalian erythroid cells. Our findings further support the emerging notion that Myc regulates chromatin structure by regulating global histone acetylation states. Five groups with three biological replicates in each.
2010-10-13 | E-GEOD-18558 | biostudies-arrayexpress
Project description:The functional impact of integrin expression in erythropoiesis has been previously emphasized through its decisive influence on erythroid cell-microenvironmental (matrix and cellular) interactions especially under conditions of stress. Beyond that in several in vitro studies the relationship between the two erythroid integrins, a4 and a5, has been incongruous in terms of a proliferative support, either synergistic or antagonistic, whereas a dominant influence of a4 integrin on terminal erythropoiesis in vitro and in vivo has been consistently emphasized. However, the specific cellular and molecular details of this effect have not been defined, especially for human cells. In the present study we have cultured human CD34+ progenitor cells with induced deficiency of a4 integrin (shRNAa4) under erythroid differentiation conditions, in which expanded erythroid progenitor cells are directed to terminal erythroid maturation stages in the absence of any microenvironmental influence. Our data documented that early proliferative expansion in cells lacking a4 expression is significantly limited, but, although erythroid differentiation can proceed normally to terminal stages, their enucleation is drastically impaired. This novel aspect of a4 integrin participation in the enucleation process in vitro resonates on the lack of in vivo enucleation of primitive erythroid cells lacking any integrin expression but affecting adult cells only under stress conditions.
2022-01-17 | GSE193747 | GEO
Project description:Terminal differentiation of mammalian erythroid progenitors involves 4-5 cell divisions and induction of many erythroid important genes, followed by chromatin and nuclear condensation and enucleation. The protein levels of c-myc (Myc) are reduced dramatically during late stage erythroid maturation, coinciding with cell cycle arrest in G1-phase and enucleation, suggesting possible roles for c-myc in either or both of these processes. Here we demonstrate that ectopic Myc expression affects terminal erythroid maturation in a dose-dependent manner. Expression of Myc at physiological levels did not affect erythroid differentiation or cell cycle shutdown, but specifically blocked erythroid nuclear condensation and enucleation. Myc prevented deacetylation of several lysine residues in histones H3 and H4 that are normally deacetylated during erythroid maturation. When over-expressed at levels higher than the physiological range, Myc blocked erythroid differentiation and the cells continued to proliferate in cytokine-free, serum-containing culture medium with an early erythroblast morphology. These studies reveal an important dose-dependent function of Myc in regulating terminal maturation in mammalian erythroid cells. Our findings further support the emerging notion that Myc regulates chromatin structure by regulating global histone acetylation states.
2010-10-13 | GSE18558 | GEO
Project description:Tropomodulins (Tmods) cap the pointed ends of actin filaments in erythroid and nonerythoid cell types. Targeted deletion of mouse Tmod3 leads to embryonic lethality at E14.5-E18.5, with anemia due to defects in definitive erythropoiesis in the fetal liver. BFU-E and CFU-E colony numbers are greatly reduced, indicating defects in progenitor populations. Flow-cytometry of fetal liver erythroblasts shows late stage populations are also decreased, including reduced percentages of enucleated cells. AnnexinV staining indicates increased apoptosis of Tmod3-/- erythroblasts, and cell cycle analysis reveals that there are more Ter119hi cells in S-phase in Tmod3-/- embryos. Notably, enucleating Tmod3-/- erythroblasts are still in the process of proliferation, suggesting impaired cell cycle exit during terminal differentiation. Tmod3-/- late erythroblasts often exhibit multi-lobular nuclear morphologies and aberrant F-actin assembly during enucleation. Furthermore, native erythroblastic island formation was impaired in Tmod3-/- fetal livers, with Tmod3 required in both erythroblasts and macrophages. In conclusion, disruption of Tmod3 leads to impaired definitive erythropoiesis, due to reduced progenitors, impaired erythroblastic island formation, and defective erythroblast cell cycle progression and enucleation. Tmod3-mediated actin remodeling may be required for erythroblast-macrophage adhesion, coordination of cell cycle with differentiation, and F-actin assembly and remodeling during erythroblast enucleation. Total RNAs from Tmod3+/+ and Tmod3-/- fetal livers at E14.5 were extracted and prepared for microarray analysis using the MoGene-1_0-st-v1 Affymetrix chip in the Scripps Research Microarray Core Facility. Each experiment was repeated with three independent embryos.
2013-10-31 | E-GEOD-51960 | biostudies-arrayexpress
Project description:Erythropoiesis in mammalian involves chromatin compaction which is initiated in the early stage of terminal differentiation. The proper condensation of chromatin is essential for the subsequent enucleation of erythroblast, but the characteristics of chromatin compaction and chromatin architecture changes in erythropoiesis are poorly understood. Here, we show that the formation of H3K9me3 long-range interactions which mediated heterochromatin three-dimensional rewiring participant in human erythroid chromatin condensation. TADs structure attenuated and boundary strength weakened globally but selectively maintaining in active chromatin region during terminal erythropoiesis. We demonstrate that the erythroid master regulators GATA1 safeguard the active chromatin structure and ensure the appropriate gene expression, under the chromatin condensation of human terminal erythropoiesis
2023-07-31 | GSE184240 | GEO