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Drakopoulou E, Georgomanoli M, Lederer CW, Panetsos F, Kleanthous M, Voskaridou E, Valakos D, Papanikolaou E, Anagnou NP. The Optimized γ-Globin Lentiviral Vector GGHI-mB-3D Leads to Nearly Therapeutic HbF Levels In Vitro in CD34 + Cells from Sickle Cell Disease Patients. Viruses 2022; 14:v14122716. [PMID: 36560719 PMCID: PMC9783242 DOI: 10.3390/v14122716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/13/2022] [Accepted: 11/30/2022] [Indexed: 12/11/2022] Open
Abstract
We have previously demonstrated that both the original γ-globin lentiviral vector (LV) GGHI and the optimized GGHI-mB-3D LV, carrying the novel regulatory elements of the 3D HPFH-1 enhancer and the 3' β-globin UTR, can significantly increase HbF production in thalassemic CD34+ cells and ameliorate the disease phenotype in vitro. In the present study, we investigated whether the GGHI-mB-3D vector can also exhibit an equally therapeutic effect, following the transduction of sickle cell disease (SCD) CD34+ cells at MOI 100, leading to HbF increase coupled with HbS decrease, and thus, to phenotype improvement in vitro. We show that GGHI-mB-3D LV can lead to high and potentially therapeutic HbF levels, reaching a mean 2-fold increase to a mean value of VCN/cell of 1.0 and a mean transduction efficiency of 55%. Furthermore, this increase was accompanied by a significant 1.6-fold HbS decrease, a beneficial therapeutic feature for SCD. In summary, our data demonstrate the efficacy of the optimized γ-globin lentiviral vector to improve the SCD phenotype in vitro, and highlights its potential use in future clinical SCD trials.
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Affiliation(s)
- Ekati Drakopoulou
- Laboratory of Cell and Gene Therapy, Centre of Basic Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), 11527 Athens, Greece
- Laboratory of Biology, School of Medicine, National and Kapodistrian University of Athens, 11527 Athens, Greece
| | - Maria Georgomanoli
- Laboratory of Cell and Gene Therapy, Centre of Basic Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), 11527 Athens, Greece
- Laboratory of Biology, School of Medicine, National and Kapodistrian University of Athens, 11527 Athens, Greece
| | - Carsten W. Lederer
- The Molecular Genetics Thalassemia Department, The Cyprus Institute of Neurology and Genetics, 2371 Nicosia, Cyprus
| | | | - Marina Kleanthous
- The Molecular Genetics Thalassemia Department, The Cyprus Institute of Neurology and Genetics, 2371 Nicosia, Cyprus
| | - Ersi Voskaridou
- Thalassemia and Sickle Cell Disease Centre, Laiko General Hospital, 11527 Athens, Greece
| | - Dimitrios Valakos
- Laboratory of Molecular Biology, Centre of Basic Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), 11527 Athens, Greece
| | - Eleni Papanikolaou
- Laboratory of Biology, School of Medicine, National and Kapodistrian University of Athens, 11527 Athens, Greece
| | - Nicholas P. Anagnou
- Laboratory of Cell and Gene Therapy, Centre of Basic Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), 11527 Athens, Greece
- Laboratory of Biology, School of Medicine, National and Kapodistrian University of Athens, 11527 Athens, Greece
- Correspondence:
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2
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Hypoxia-Induced Alpha-Globin Expression in Syncytiotrophoblasts Mimics the Pattern Observed in Preeclamptic Placentas. Int J Mol Sci 2021; 22:ijms22073357. [PMID: 33806017 PMCID: PMC8036899 DOI: 10.3390/ijms22073357] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 03/16/2021] [Accepted: 03/18/2021] [Indexed: 12/16/2022] Open
Abstract
Preeclampsia (PE) is a pregnancy disorder associated with placental dysfunction and elevated fetal hemoglobin (HbF). Early in pregnancy the placenta harbors hematopoietic stem and progenitor cells (HSPCs) and is an extramedullary source of erythropoiesis. However, globin expression is not unique to erythroid cells and can be triggered by hypoxia. To investigate the role of the placenta in increasing globin levels previously reported in PE, flow cytometry, histological and immunostaining and in situ analyses were used on placenta samples and ex vivo explant cultures. Our results indicated that in PE pregnancies, placental HSPC homing and erythropoiesis were not affected. Non-erythroid alpha-globin mRNA and protein, but not gamma-globin, were detected in syncytiotrophoblasts and stroma of PE placenta samples. Similarly, alpha-globin protein and mRNA were upregulated in normal placenta explants cultured in hypoxia. The upregulation was independent of HIF1 and NRF2, the two main candidates of globin transcription in non-erythroid cells. Our study is the first to demonstrate alpha-globin mRNA expression in syncytiotrophoblasts in PE, induced by hypoxia. However, gamma-globin was only expressed in erythrocytes. We conclude that alpha-globin, but not HbF, is expressed in placental syncytiotrophoblasts in PE and may contribute to the pathology of the disease.
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3
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Grønlien HK, Christoffersen TE, Nystrand CF, Garabet L, Syvertsen T, Moe MK, Olstad OK, Jonassen CM. Cytokine and Gene Expression Profiling in Patients with HFE-Associated Hereditary Hemochromatosis according to Genetic Profile. Acta Haematol 2020; 144:446-457. [PMID: 33326952 DOI: 10.1159/000511551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 09/12/2020] [Indexed: 11/19/2022]
Abstract
BACKGROUND Hemochromatosis gene (HFE)-associated hereditary hemochromatosis (HH) is characterized by downregulation of hepcidin synthesis, leading to increased intestinal iron absorption. OBJECTIVES The objectives were to characterize and elucidate a possible association between gene expression profile, hepcidin levels, disease severity, and markers of inflammation in HFE-associated HH patients. METHODS Thirty-nine HFE-associated HH patients were recruited and assigned to 2 groups according to genetic profile: C282Y homozygotes in 1 group and patients with H63D, as homozygote or in combination with C282Y, in the other group. Eleven healthy first-time blood donors were recruited as controls. Gene expression was characterized from peripheral blood cells, and inflammatory cytokines and hepcidin-25 isoform were quantified in serum. Biochemical disease characteristics were recorded. RESULTS Elevated levels of interleukin 8 were observed in a significant higher proportion of patients than controls. In addition, compared to controls, gene expression of ζ-globin was significantly increased among C282Y homozygote patients, while gene expression of matrix metalloproteinase 8, and other neutrophil-secreted proteins, was significantly upregulated in patients with H63D. CONCLUSION Different disease signatures may characterize HH patients according to their HFE genetic profile. Studies on larger populations, including analyses at protein level, are necessary to confirm these findings.
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Affiliation(s)
| | | | | | - Lamya Garabet
- Center for Laboratory Medicine, Østfold Hospital Trust, Grålum, Norway
- Department of Multidisciplinary Laboratory Medicine and Medical Biochemistry, Akershus University Hospital, Lørenskog, Norway
| | - Terje Syvertsen
- Center for Laboratory Medicine, Østfold Hospital Trust, Grålum, Norway
| | - Morten K Moe
- Department of Multidisciplinary Laboratory Medicine and Medical Biochemistry, Akershus University Hospital, Lørenskog, Norway
| | | | - Christine Monceyron Jonassen
- Center for Laboratory Medicine, Østfold Hospital Trust, Grålum, Norway,
- Department of Chemistry, Biotechnology and Food Sciences, The Norwegian University of Life Sciences, Ås, Norway,
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4
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Ulianov SV, Galitsyna AA, Flyamer IM, Golov AK, Khrameeva EE, Imakaev MV, Abdennur NA, Gelfand MS, Gavrilov AA, Razin SV. Activation of the alpha-globin gene expression correlates with dramatic upregulation of nearby non-globin genes and changes in local and large-scale chromatin spatial structure. Epigenetics Chromatin 2017; 10:35. [PMID: 28693562 PMCID: PMC5504709 DOI: 10.1186/s13072-017-0142-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Accepted: 07/03/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In homeotherms, the alpha-globin gene clusters are located within permanently open genome regions enriched in housekeeping genes. Terminal erythroid differentiation results in dramatic upregulation of alpha-globin genes making their expression comparable to the rRNA transcriptional output. Little is known about the influence of the erythroid-specific alpha-globin gene transcription outburst on adjacent, widely expressed genes and large-scale chromatin organization. Here, we have analyzed the total transcription output, the overall chromatin contact profile, and CTCF binding within the 2.7 Mb segment of chicken chromosome 14 harboring the alpha-globin gene cluster in cultured lymphoid cells and cultured erythroid cells before and after induction of terminal erythroid differentiation. RESULTS We found that, similarly to mammalian genome, the chicken genomes is organized in TADs and compartments. Full activation of the alpha-globin gene transcription in differentiated erythroid cells is correlated with upregulation of several adjacent housekeeping genes and the emergence of abundant intergenic transcription. An extended chromosome region encompassing the alpha-globin cluster becomes significantly decompacted in differentiated erythroid cells, and depleted in CTCF binding and CTCF-anchored chromatin loops, while the sub-TAD harboring alpha-globin gene cluster and the upstream major regulatory element (MRE) becomes highly enriched with chromatin interactions as compared to lymphoid and proliferating erythroid cells. The alpha-globin gene domain and the neighboring loci reside within the A-like chromatin compartment in both lymphoid and erythroid cells and become further segregated from the upstream gene desert upon terminal erythroid differentiation. CONCLUSIONS Our findings demonstrate that the effects of tissue-specific transcription activation are not restricted to the host genomic locus but affect the overall chromatin structure and transcriptional output of the encompassing topologically associating domain.
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Affiliation(s)
- Sergey V Ulianov
- Institute of Gene Biology of the Russian Academy of Sciences, Moscow, Russia 119334.,Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia 119992
| | - Aleksandra A Galitsyna
- Institute of Gene Biology of the Russian Academy of Sciences, Moscow, Russia 119334.,Faculty of Bioengineering and Bioinformatics, M.V. Lomonosov Moscow State University, Moscow, Russia 119992.,Institute for Information Transmission Problems (the Kharkevich Institute) of the Russian Academy of Sciences, Moscow, Russia 127051
| | - Ilya M Flyamer
- Institute of Gene Biology of the Russian Academy of Sciences, Moscow, Russia 119334.,Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia 119992.,MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - Arkadiy K Golov
- Institute of Gene Biology of the Russian Academy of Sciences, Moscow, Russia 119334
| | - Ekaterina E Khrameeva
- Skolkovo Institute of Science and Technology, Skolkovo, Russia 143026.,Institute for Information Transmission Problems (the Kharkevich Institute) of the Russian Academy of Sciences, Moscow, Russia 127051
| | - Maxim V Imakaev
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139 USA
| | - Nezar A Abdennur
- Computational and Systems Biology Graduate Program, Massachusetts Institute of Technology, Cambridge, MA USA
| | - Mikhail S Gelfand
- Faculty of Bioengineering and Bioinformatics, M.V. Lomonosov Moscow State University, Moscow, Russia 119992.,Skolkovo Institute of Science and Technology, Skolkovo, Russia 143026.,Institute for Information Transmission Problems (the Kharkevich Institute) of the Russian Academy of Sciences, Moscow, Russia 127051.,Faculty of Computer Science, Higher School of Economics, Moscow, Russia 125319
| | - Alexey A Gavrilov
- Institute of Gene Biology of the Russian Academy of Sciences, Moscow, Russia 119334
| | - Sergey V Razin
- Institute of Gene Biology of the Russian Academy of Sciences, Moscow, Russia 119334.,Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia 119992
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5
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Yang J, Tanaka Y, Seay M, Li Z, Jin J, Garmire LX, Zhu X, Taylor A, Li W, Euskirchen G, Halene S, Kluger Y, Snyder MP, Park IH, Pan X, Weissman SM. Single cell transcriptomics reveals unanticipated features of early hematopoietic precursors. Nucleic Acids Res 2017; 45:1281-1296. [PMID: 28003475 PMCID: PMC5388401 DOI: 10.1093/nar/gkw1214] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 11/23/2016] [Indexed: 12/18/2022] Open
Abstract
Molecular changes underlying stem cell differentiation are of fundamental interest. scRNA-seq on murine hematopoietic stem cells (HSC) and their progeny MPP1 separated the cells into 3 main clusters with distinct features: active, quiescent, and an un-characterized cluster. Induction of anemia resulted in mobilization of the quiescent to the active cluster and of the early to later stage of cell cycle, with marked increase in expression of certain transcription factors (TFs) while maintaining expression of interferon response genes. Cells with surface markers of long term HSC increased the expression of a group of TFs expressed highly in normal cycling MPP1 cells. However, at least Id1 and Hes1 were significantly activated in both HSC and MPP1 cells in anemic mice. Lineage-specific genes were differently expressed between cells, and correlated with the cell cycle stages with a specific augmentation of erythroid related genes in the G2/M phase. Most lineage specific TFs were stochastically expressed in the early precursor cells, but a few, such as Klf1, were detected only at very low levels in few precursor cells. The activation of these factors may correlate with stages of differentiation. This study reveals effects of cell cycle progression on the expression of lineage specific genes in precursor cells, and suggests that hematopoietic stress changes the balance of renewal and differentiation in these homeostatic cells.
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Affiliation(s)
- Jennifer Yang
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
| | - Yoshiaki Tanaka
- Yale Stem Cell Center, Yale School of Medicine, New Haven, CT, USA
| | - Montrell Seay
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
| | - Zhen Li
- Department of Neurobiology, Yale School of Medicine, New Haven, CT, USA
| | - Jiaqi Jin
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA
| | - Lana Xia Garmire
- Epidemiology Program, University of Hawaii Cancer Center, HI, USA
| | - Xun Zhu
- Epidemiology Program, University of Hawaii Cancer Center, HI, USA
| | - Ashley Taylor
- Hematology, Yale Comprehensive Cancer Center and Department of Internal Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Weidong Li
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA.,JiangXi Key Laboratory of Systems Biomedicine, Jiujiang University, Jiangxi, PR China
| | - Ghia Euskirchen
- Department of Genetics, Stanford University, Palo, Alto, CA, USA
| | - Stephanie Halene
- Hematology, Yale Comprehensive Cancer Center and Department of Internal Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Yuval Kluger
- Department of Pathology, Yale School of Medicine, New Haven, CT, USA
| | - Michael P Snyder
- Department of Genetics, Stanford University, Palo, Alto, CA, USA
| | - In-Hyun Park
- Yale Stem Cell Center, Yale School of Medicine, New Haven, CT, USA
| | - Xinghua Pan
- Department of Genetics, Yale School of Medicine, New Haven, CT, USA.,Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, and Guangdong Key Laboratory of Biochip Technology, Southern Medical University, Guangzhou, Guangdong, PR China
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6
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Kuvardina ON, Herkt S, Meyer A, Schneider L, Yillah J, Kohrs N, Bonig H, Seifried E, Müller-Tidow C, Lausen J. Hematopoietic transcription factors and differential cofactor binding regulate PRKACB isoform expression. Oncotarget 2017; 8:71685-71698. [PMID: 29069738 PMCID: PMC5641081 DOI: 10.18632/oncotarget.17386] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 03/27/2017] [Indexed: 01/05/2023] Open
Abstract
Hematopoietic differentiation is controlled by key transcription factors, which regulate stem cell functions and differentiation. TAL1 is a central transcription factor for hematopoietic stem cell development in the embryo and for gene regulation during erythroid/megakaryocytic differentiation. Knowledge of the target genes controlled by a given transcription factor is important to understand its contribution to normal development and disease. To uncover direct target genes of TAL1 we used high affinity streptavidin/biotin-based chromatin precipitation (Strep-CP) followed by Strep-CP on ChIP analysis using ChIP promoter arrays. We identified 451 TAL1 target genes in K562 cells. Furthermore, we analysed the regulation of one of these genes, the catalytic subunit beta of protein kinase A (PRKACB), during megakaryopoiesis of K562 and primary human CD34+ stem cell/progenitor cells. We found that TAL1 together with hematopoietic transcription factors RUNX1 and GATA1 binds to the promoter of the isoform 3 of PRKACB (Cβ3). During megakaryocytic differentiation a coactivator complex on the Cβ3 promoter, which includes WDR5 and p300, is replaced with a corepressor complex. In this manner, activating chromatin modifications are removed and expression of the PRKACB-Cβ3 isoform during megakaryocytic differentiation is reduced. Our data uncover a role of the TAL1 complex in controlling differential isoform expression of PRKACB. These results reveal a novel function of TAL1, RUNX1 and GATA1 in the transcriptional control of protein kinase A activity, with implications for cellular signalling control during differentiation and disease.
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Affiliation(s)
- Olga N Kuvardina
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
| | - Stefanie Herkt
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
| | - Annekarin Meyer
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
| | - Lucas Schneider
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
| | - Jasmin Yillah
- Georg-Speyer-Haus, Institute for Tumorbiology and experimental Therapy, Frankfurt, Germany
| | - Nicole Kohrs
- Georg-Speyer-Haus, Institute for Tumorbiology and experimental Therapy, Frankfurt, Germany
| | - Halvard Bonig
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
| | - Erhard Seifried
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
| | - Carsten Müller-Tidow
- Department of Internal Medicine V, Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
| | - Jörn Lausen
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
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7
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Kohrs N, Kolodziej S, Kuvardina ON, Herglotz J, Yillah J, Herkt S, Piechatzek A, Salinas Riester G, Lingner T, Wichmann C, Bonig H, Seifried E, Platzbecker U, Medyouf H, Grez M, Lausen J. MiR144/451 Expression Is Repressed by RUNX1 During Megakaryopoiesis and Disturbed by RUNX1/ETO. PLoS Genet 2016; 12:e1005946. [PMID: 26990877 PMCID: PMC4798443 DOI: 10.1371/journal.pgen.1005946] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 03/01/2016] [Indexed: 01/22/2023] Open
Abstract
A network of lineage-specific transcription factors and microRNAs tightly regulates differentiation of hematopoietic stem cells along the distinct lineages. Deregulation of this regulatory network contributes to impaired lineage fidelity and leukemogenesis. We found that the hematopoietic master regulator RUNX1 controls the expression of certain microRNAs, of importance during erythroid/megakaryocytic differentiation. In particular, we show that the erythorid miR144/451 cluster is epigenetically repressed by RUNX1 during megakaryopoiesis. Furthermore, the leukemogenic RUNX1/ETO fusion protein transcriptionally represses the miR144/451 pre-microRNA. Thus RUNX1/ETO contributes to increased expression of miR451 target genes and interferes with normal gene expression during differentiation. Furthermore, we observed that inhibition of RUNX1/ETO in Kasumi1 cells and in RUNX1/ETO positive primary acute myeloid leukemia patient samples leads to up-regulation of miR144/451. RUNX1 thus emerges as a key regulator of a microRNA network, driving differentiation at the megakaryocytic/erythroid branching point. The network is disturbed by the leukemogenic RUNX1/ETO fusion product.
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Affiliation(s)
- Nicole Kohrs
- Georg-Speyer-Haus, Institute for Tumorbiology and Experimental Therapy, Frankfurt, Germany
| | - Stephan Kolodziej
- Georg-Speyer-Haus, Institute for Tumorbiology and Experimental Therapy, Frankfurt, Germany
| | - Olga N. Kuvardina
- Georg-Speyer-Haus, Institute for Tumorbiology and Experimental Therapy, Frankfurt, Germany
| | - Julia Herglotz
- Heinrich-Pette-Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany
| | - Jasmin Yillah
- Georg-Speyer-Haus, Institute for Tumorbiology and Experimental Therapy, Frankfurt, Germany
| | - Stefanie Herkt
- Georg-Speyer-Haus, Institute for Tumorbiology and Experimental Therapy, Frankfurt, Germany
| | - Alexander Piechatzek
- Georg-Speyer-Haus, Institute for Tumorbiology and Experimental Therapy, Frankfurt, Germany
| | | | - Thomas Lingner
- Medical-University Goettingen, Transcriptome Analysis Laboratory, Goettingen, Germany
| | - Christian Wichmann
- Department of Transfusion Medicine, Cell Therapeutics and Hemostaseology, Ludwig-Maximilian University Hospital, Munich, Germany
| | - Halvard Bonig
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
| | - Erhard Seifried
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
| | - Uwe Platzbecker
- Department of Hematology, Medical Clinic and Polyclinic I, University Hospital Carl Gustav Carus, Dresden, Germany
| | - Hind Medyouf
- Georg-Speyer-Haus, Institute for Tumorbiology and Experimental Therapy, Frankfurt, Germany
| | - Manuel Grez
- Georg-Speyer-Haus, Institute for Tumorbiology and Experimental Therapy, Frankfurt, Germany
| | - Jörn Lausen
- Georg-Speyer-Haus, Institute for Tumorbiology and Experimental Therapy, Frankfurt, Germany
- Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University and German Red Cross Blood Service, Frankfurt am Main, Germany
- * E-mail:
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8
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Khosravi A, Jalali-Far M, Saki N, Hosseini H, Galehdari H, Kiani-Ghalesardi O, Paridar M, Azarkeivan A, Magaji-Hamid K. Evaluation of α-Globin Gene Mutations Among Different Ethnic Groups in Khuzestan Province, Southwest Iran. Hemoglobin 2016; 40:113-7. [DOI: 10.3109/03630269.2015.1130720] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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9
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Rivera-Mulia JC, Buckley Q, Sasaki T, Zimmerman J, Didier RA, Nazor K, Loring JF, Lian Z, Weissman S, Robins AJ, Schulz TC, Menendez L, Kulik MJ, Dalton S, Gabr H, Kahveci T, Gilbert DM. Dynamic changes in replication timing and gene expression during lineage specification of human pluripotent stem cells. Genome Res 2015; 25:1091-103. [PMID: 26055160 PMCID: PMC4509994 DOI: 10.1101/gr.187989.114] [Citation(s) in RCA: 105] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 06/05/2015] [Indexed: 12/31/2022]
Abstract
Duplication of the genome in mammalian cells occurs in a defined temporal order referred to as its replication-timing (RT) program. RT changes dynamically during development, regulated in units of 400-800 kb referred to as replication domains (RDs). Changes in RT are generally coordinated with transcriptional competence and changes in subnuclear position. We generated genome-wide RT profiles for 26 distinct human cell types, including embryonic stem cell (hESC)-derived, primary cells and established cell lines representing intermediate stages of endoderm, mesoderm, ectoderm, and neural crest (NC) development. We identified clusters of RDs that replicate at unique times in each stage (RT signatures) and confirmed global consolidation of the genome into larger synchronously replicating segments during differentiation. Surprisingly, transcriptome data revealed that the well-accepted correlation between early replication and transcriptional activity was restricted to RT-constitutive genes, whereas two-thirds of the genes that switched RT during differentiation were strongly expressed when late replicating in one or more cell types. Closer inspection revealed that transcription of this class of genes was frequently restricted to the lineage in which the RT switch occurred, but was induced prior to a late-to-early RT switch and/or down-regulated after an early-to-late RT switch. Analysis of transcriptional regulatory networks showed that this class of genes contains strong regulators of genes that were only expressed when early replicating. These results provide intriguing new insight into the complex relationship between transcription and RT regulation during human development.
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Affiliation(s)
- Juan Carlos Rivera-Mulia
- Department of Biological Science, Florida State University, Tallahassee, Florida 32306-4295, USA
| | - Quinton Buckley
- Department of Biological Science, Florida State University, Tallahassee, Florida 32306-4295, USA
| | - Takayo Sasaki
- Department of Biological Science, Florida State University, Tallahassee, Florida 32306-4295, USA
| | - Jared Zimmerman
- Department of Biological Science, Florida State University, Tallahassee, Florida 32306-4295, USA
| | - Ruth A Didier
- College of Medicine, Florida State University, Tallahassee, Florida 32306-4295, USA
| | - Kristopher Nazor
- Center for Regenerative Medicine, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, California 92037, USA
| | - Jeanne F Loring
- Center for Regenerative Medicine, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, California 92037, USA
| | - Zheng Lian
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut 06519, USA
| | - Sherman Weissman
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut 06519, USA
| | | | | | - Laura Menendez
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, USA
| | - Michael J Kulik
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, USA
| | - Stephen Dalton
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, USA
| | - Haitham Gabr
- Department of Computer and Information Sciences and Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - Tamer Kahveci
- Department of Computer and Information Sciences and Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - David M Gilbert
- Department of Biological Science, Florida State University, Tallahassee, Florida 32306-4295, USA; Center for Genomics and Personalized Medicine, Florida State University, Tallahassee, Florida 32306, USA
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10
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RUNX1 represses the erythroid gene expression program during megakaryocytic differentiation. Blood 2015; 125:3570-9. [PMID: 25911237 DOI: 10.1182/blood-2014-11-610519] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 04/13/2015] [Indexed: 12/13/2022] Open
Abstract
The activity of antagonizing transcription factors represents a mechanistic paradigm of bidirectional lineage-fate control during hematopoiesis. At the megakaryocytic/erythroid bifurcation, the cross-antagonism of krueppel-like factor 1 (KLF1) and friend leukemia integration 1 (FLI1) has such a decisive role. However, how this antagonism is resolved during lineage specification is poorly understood. We found that runt-related transcription factor 1 (RUNX1) inhibits erythroid differentiation of murine megakaryocytic/erythroid progenitors and primary human CD34(+) progenitor cells. We show that RUNX1 represses the erythroid gene expression program during megakaryocytic differentiation by epigenetic repression of the erythroid master regulator KLF1. RUNX1 binding to the KLF1 locus is increased during megakaryocytic differentiation and counterbalances the activating role of T-cell acute lymphocytic leukemia 1 (TAL1). We found that corepressor recruitment by RUNX1 contributes to a block of the KLF1-dependent erythroid gene expression program. Our data indicate that the repressive function of RUNX1 influences the balance between erythroid and megakaryocytic differentiation by shifting the balance between KLF1 and FLI1 in the direction of FLI1. Taken together, we show that RUNX1 is a key player within a network of transcription factors that represses the erythroid gene expression program.
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11
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Paulsen J, Rødland EA, Holden L, Holden M, Hovig E. A statistical model of ChIA-PET data for accurate detection of chromatin 3D interactions. Nucleic Acids Res 2014; 42:e143. [PMID: 25114054 PMCID: PMC4191384 DOI: 10.1093/nar/gku738] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 07/10/2014] [Accepted: 08/01/2014] [Indexed: 12/23/2022] Open
Abstract
Identification of three-dimensional (3D) interactions between regulatory elements across the genome is crucial to unravel the complex regulatory machinery that orchestrates proliferation and differentiation of cells. ChIA-PET is a novel method to identify such interactions, where physical contacts between regions bound by a specific protein are quantified using next-generation sequencing. However, determining the significance of the observed interaction frequencies in such datasets is challenging, and few methods have been proposed. Despite the fact that regions that are close in linear genomic distance have a much higher tendency to interact by chance, no methods to date are capable of taking such dependency into account. Here, we propose a statistical model taking into account the genomic distance relationship, as well as the general propensity of anchors to be involved in contacts overall. Using both real and simulated data, we show that the previously proposed statistical test, based on Fisher's exact test, leads to invalid results when data are dependent on genomic distance. We also evaluate our method on previously validated cell-line specific and constitutive 3D interactions, and show that relevant interactions are significant, while avoiding over-estimating the significance of short nearby interactions.
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Affiliation(s)
- Jonas Paulsen
- Institute for Cancer Genetics and Informatics, Oslo University Hospital, PO Box 4950, Nydalen, N-0424 Oslo, Norway
| | - Einar A Rødland
- Department of Tumor Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, PO Box 4950, Nydalen, N-0424 Oslo, Norway
| | - Lars Holden
- Statistics for Innovation, Norwegian Computing Center, N-0314 Oslo, Norway
| | - Marit Holden
- Statistics for Innovation, Norwegian Computing Center, N-0314 Oslo, Norway
| | - Eivind Hovig
- Institute for Cancer Genetics and Informatics, Oslo University Hospital, PO Box 4950, Nydalen, N-0424 Oslo, Norway Department of Tumor Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, PO Box 4950, Nydalen, N-0424 Oslo, Norway
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12
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Kolodziej S, Kuvardina ON, Oellerich T, Herglotz J, Backert I, Kohrs N, Buscató EL, Wittmann SK, Salinas-Riester G, Bonig H, Karas M, Serve H, Proschak E, Lausen J. PADI4 acts as a coactivator of Tal1 by counteracting repressive histone arginine methylation. Nat Commun 2014; 5:3995. [PMID: 24874575 PMCID: PMC4050257 DOI: 10.1038/ncomms4995] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 04/28/2014] [Indexed: 01/26/2023] Open
Abstract
The transcription factor Tal1 is a
critical activator or repressor of gene expression in hematopoiesis and leukaemia.
The mechanism by which Tal1
differentially influences transcription of distinct genes is not fully understood.
Here we show that Tal1 interacts
with the peptidylarginine deiminase
IV (PADI4). We
demonstrate that PADI4 can act as
an epigenetic coactivator through influencing H3R2me2a. At the Tal1/PADI4 target gene IL6ST the repressive H3R2me2a mark triggered by
PRMT6 is counteracted by
PADI4, which augments the
active H3K4me3 mark and thus increases IL6ST expression. In contrast, at the CTCF promoter PADI4 acts as a repressor. We propose that
the influence of PADI4 on
IL6ST transcription
plays a role in the control of IL6ST expression during lineage differentiation of
hematopoietic stem/progenitor cells. These results open the possibility to
pharmacologically influence Tal1
in leukaemia. Peptidylarginine deiminase 4 (PADI4) is a transcriptional
co-regulator that converts arginine residues at histone tails to citrulline. The authors
show that PADI4 interacts with the central haematopoietic transcription factor TAL1 to
regulate gene expression in an erythroleukemia cell line.
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Affiliation(s)
- Stephan Kolodziej
- Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, Paul-Ehrlich-Strasse 42-44, D-60596 Frankfurt am Main, Germany
| | - Olga N Kuvardina
- Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, Paul-Ehrlich-Strasse 42-44, D-60596 Frankfurt am Main, Germany
| | - Thomas Oellerich
- Department of Medicine, Hematology/Oncology, Johann-Wolfgang-Goethe University, Theodor-Stern-Kai 7, D-60590 Frankfurt am Main, Germany
| | - Julia Herglotz
- 1] Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, Paul-Ehrlich-Strasse 42-44, D-60596 Frankfurt am Main, Germany [2]
| | - Ingo Backert
- 1] Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, Paul-Ehrlich-Strasse 42-44, D-60596 Frankfurt am Main, Germany [2]
| | - Nicole Kohrs
- Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, Paul-Ehrlich-Strasse 42-44, D-60596 Frankfurt am Main, Germany
| | - Estel la Buscató
- Institute of Pharmaceutical Chemistry, Johann-Wolfgang-Goethe University, Max-von-Laue-Strasse 9, D-60438 Frankfurt am Main, Germany
| | - Sandra K Wittmann
- Institute of Pharmaceutical Chemistry, Johann-Wolfgang-Goethe University, Max-von-Laue-Strasse 9, D-60438 Frankfurt am Main, Germany
| | - Gabriela Salinas-Riester
- Medical-University Goettingen, Transcriptome Analysis Laboratory, Justus-von-Liebig-Weg 11, D-37077 Goettingen, Germany
| | - Halvard Bonig
- German Red Cross Blood Service and Institute for Transfusion Medicine and Immunohematology, Johann-Wolfgang-Goethe University, Sandhofstrasse 1, D-60528 Frankfurt am Main, Germany
| | - Michael Karas
- Institute of Pharmaceutical Chemistry, Johann-Wolfgang-Goethe University, Max-von-Laue-Strasse 9, D-60438 Frankfurt am Main, Germany
| | - Hubert Serve
- 1] Department of Medicine, Hematology/Oncology, Johann-Wolfgang-Goethe University, Theodor-Stern-Kai 7, D-60590 Frankfurt am Main, Germany [2] German Cancer Consortium (DKTK), Heidelberg, Germany
| | - Ewgenij Proschak
- 1] Institute of Pharmaceutical Chemistry, Johann-Wolfgang-Goethe University, Max-von-Laue-Strasse 9, D-60438 Frankfurt am Main, Germany [2] German Cancer Consortium (DKTK), Heidelberg, Germany
| | - Jörn Lausen
- Georg-Speyer-Haus, Institute for Tumor Biology and Experimental Therapy, Paul-Ehrlich-Strasse 42-44, D-60596 Frankfurt am Main, Germany
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13
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Cohen EB, Jun SJ, Bears Z, Barrera FN, Alonso M, Engelman DM, DiMaio D. Mapping the homodimer interface of an optimized, artificial, transmembrane protein activator of the human erythropoietin receptor. PLoS One 2014; 9:e95593. [PMID: 24788775 PMCID: PMC4005772 DOI: 10.1371/journal.pone.0095593] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 03/28/2014] [Indexed: 01/20/2023] Open
Abstract
Transmembrane proteins constitute a large fraction of cellular proteins, and specific interactions involving membrane-spanning protein segments play an important role in protein oligomerization, folding, and function. We previously isolated an artificial, dimeric, 44-amino acid transmembrane protein that activates the human erythropoietin receptor (hEPOR) in trans. This artificial protein supports limited erythroid differentiation of primary human hematopoietic progenitor cells in vitro, even though it does not resemble erythropoietin, the natural ligand of this receptor. Here, we used a directed-evolution approach to explore the structural basis for the ability of transmembrane proteins to activate the hEPOR. A library that expresses thousands of mutants of the transmembrane activator was screened for variants that were more active than the original isolate at inducing growth factor independence in mouse cells expressing the hEPOR. The most active mutant, EBC5-16, supports erythroid differentiation in human cells with activity approaching that of EPO, as assessed by cell-surface expression of glycophorin A, a late-stage marker of erythroid differentiation. EBC5-16 contains a single isoleucine to serine substitution at position 25, which increases its ability to form dimers. Genetic studies confirmed the importance of dimerization for activity and identified the residues constituting the homodimer interface of EBC5-16. The interface requires a GxxxG dimer packing motif and a small amino acid at position 25 for maximal activity, implying that tight packing of the EBC5-16 dimer is a crucial determinant of activity. These experiments identified an artificial protein that causes robust activation of its target in a natural host cell, demonstrated the importance of dimerization of this protein for engagement of the hEPOR, and provided the framework for future structure-function studies of this novel mechanism of receptor activation.
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Affiliation(s)
- Emily B. Cohen
- Department of Genetics, Yale School of Medicine, New Haven, Connecticut, United States of America
| | - Susan J. Jun
- Department of Genetics, Yale School of Medicine, New Haven, Connecticut, United States of America
| | - Zachary Bears
- Department of Genetics, Yale School of Medicine, New Haven, Connecticut, United States of America
| | - Francisco N. Barrera
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, Knoxville, Tennessee, United States of America
| | - Miriam Alonso
- Department of Molecular Biophysics & Biochemistry, Yale School of Medicine, New Haven, Connecticut, United States of America
| | - Donald M. Engelman
- Department of Molecular Biophysics & Biochemistry, Yale School of Medicine, New Haven, Connecticut, United States of America
- Yale Cancer Center, New Haven, Connecticut, United States of America
| | - Daniel DiMaio
- Department of Genetics, Yale School of Medicine, New Haven, Connecticut, United States of America
- Department of Molecular Biophysics & Biochemistry, Yale School of Medicine, New Haven, Connecticut, United States of America
- Yale Cancer Center, New Haven, Connecticut, United States of America
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut, United States of America
- * E-mail:
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14
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Regulation of Gγ-globin gene by ATF2 and its associated proteins through the cAMP-response element. PLoS One 2013; 8:e78253. [PMID: 24223142 PMCID: PMC3819381 DOI: 10.1371/journal.pone.0078253] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 09/10/2013] [Indexed: 01/12/2023] Open
Abstract
The upstream Gγ-globin cAMP-response element (G-CRE) plays an important role in regulating Gγ-globin expression through binding of ATF2 and its DNA-binding partners defined in this study. ATF2 knockdown resulted in a significant reduction of γ-globin expression accompanied by decreased ATF2 binding to the G-CRE. By contrast, stable ATF2 expression in K562 cells increased γ-globin transcription which was reduced by ATF2 knockdown. Moreover, a similar effect of ATF2 on γ-globin expression was observed in primary erythroid progenitors. To understand the role of ATF2 in γ-globin expression, chromatographically purified G-CRE/ATF2-interacting proteins were subjected to mass spectrometry analysis; major binding partners included CREB1, cJun, Brg1, and histone deacetylases among others. Immunoprecipitation assays demonstrated interaction of these proteins with ATF2 and in vivo GCRE binding in CD34+ cells undergoing erythroid differentiation which was correlated with γ-globin expression during development. These results suggest synergism between developmental stage-specific recruitments of the ATF2 protein complex and expression of γ-globin during erythropoiesis. Microarray studies in K562 cells support ATF2 plays diverse roles in hematopoiesis and chromatin remodeling.
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15
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Abstract
The coordinated recruitment of epigenetic regulators of gene expression by transcription factors such as RUNX1 (AML1, acute myeloid leukemia 1) is crucial for hematopoietic differentiation. Here, we identify protein arginine methyltransferase 6 (PRMT6) as a central functional component of a RUNX1 corepressor complex containing Sin3a and HDAC1 in human hematopoietic progenitor cells. PRMT6 is recruited by RUNX1 and mediates asymmetric histone H3 arginine-2 dimethylation (H3R2me2a) at megakaryocytic genes in progenitor cells. H3R2me2a keeps RUNX1 target genes in an intermediate state with concomitant H3K27me3 and H3K4me2 but not H3K4me3. Upon megakaryocytic differentiation PRMT6 binding is lost, the H3R2me2a mark decreases and a coactivator complex containing WDR5/MLL and p300/pCAF is recruited. This leads to an increase of H3K4me3 and H3K9ac, which result in augmented gene expression. Our results provide novel mechanistic insight into how RUNX1 activity in hematopoietic progenitor cells maintains differentiation genes in a suppressed state but poised for rapid transcriptional activation.
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16
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Zaccariotto T, Lanaro C, Albuquerque D, Santos M, Bezerra M, Cunha F, Lorand-Metze I, Araujo A, Costa F, Sonati M. Expression profiles of phosphatidylinositol phosphate kinase genes during normal human in vitro erythropoiesis. GENETICS AND MOLECULAR RESEARCH 2012; 11:3861-8. [DOI: 10.4238/2012.november.12.3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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17
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Role of helix-loop-helix proteins during differentiation of erythroid cells. Mol Cell Biol 2011; 31:1332-43. [PMID: 21282467 DOI: 10.1128/mcb.01186-10] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Helix-loop-helix (HLH) proteins play a profound role in the process of development and cellular differentiation. Among the HLH proteins expressed in differentiating erythroid cells are the ubiquitous proteins Myc, USF1, USF2, and TFII-I, as well as the hematopoiesis-specific transcription factor Tal1/SCL. All of these HLH proteins exhibit distinct functions during the differentiation of erythroid cells. For example, Myc stimulates the proliferation of erythroid progenitor cells, while the USF proteins and Tal1 regulate genes that specify the differentiated phenotype. This minireview summarizes the known activities of Myc, USF, TFII-I, and Tal11/SCL and discusses how they may function sequentially, cooperatively, or antagonistically in regulating expression programs during the differentiation of erythroid cells.
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18
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Karmakar S, Mahajan MC, Schulz V, Boyapaty G, Weissman SM. A multiprotein complex necessary for both transcription and DNA replication at the β-globin locus. EMBO J 2010; 29:3260-71. [PMID: 20808282 DOI: 10.1038/emboj.2010.204] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Accepted: 07/29/2010] [Indexed: 12/17/2022] Open
Abstract
DNA replication, repair, transcription and chromatin structure are intricately associated nuclear processes, but the molecular links between these events are often obscure. In this study, we have surveyed the protein complexes that bind at β-globin locus control region, and purified and characterized the function of one such multiprotein complex from human erythroleukemic K562 cells. We further validated the existence of this complex in human CD34+ cell-derived normal erythroid cells. This complex contains ILF2/ILF3 transcription factors, p300 acetyltransferase and proteins associated with DNA replication, transcription and repair. RNAi knockdown of ILF2, a DNA-binding component of this complex, abrogates the recruitment of the complex to its cognate DNA sequence and inhibits transcription, histone acetylation and usage of the origin of DNA replication at the β-globin locus. These results imply a direct link between mammalian DNA replication, transcription and histone acetylation mediated by a single multiprotein complex.
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Affiliation(s)
- Subhradip Karmakar
- Department of Genetics, The Anlyan Center, Yale University School of Medicine, New Haven, CT, USA
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19
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van den Akker E, Satchwell TJ, Pellegrin S, Daniels G, Toye AM. The majority of the in vitro erythroid expansion potential resides in CD34(-) cells, outweighing the contribution of CD34(+) cells and significantly increasing the erythroblast yield from peripheral blood samples. Haematologica 2010; 95:1594-8. [PMID: 20378567 DOI: 10.3324/haematol.2009.019828] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The study of human erythropoiesis in health and disease requires a robust culture system that consistently and reliably generates large numbers of immature erythroblasts that can be induced to differentiate synchronously. We describe a culture method modified from Leberbauer et al. (2005) and obtain a homogenous population of erythroblasts from peripheral blood mononuclear cells (PBMC) without prior purification of CD34(+) cells. This pure population of immature erythroblasts can be expanded to obtain 4x10(8) erythroblasts from 1x10(8) PBMC after 13-14 days in culture. Upon synchronized differentiation, high levels of enucleation (80-90%) and low levels of cell death (<10%) are achieved. We compared the yield of erythroblasts obtained from PBMC, CD34(+) cells or PBMC depleted of CD34(+) cells and show that CD34(-) cells represent the most significant early erythroid progenitor population. This culture system may be particularly useful for investigating the pathophysiology of anemic patients where only small blood volumes are available.
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Affiliation(s)
- Emile van den Akker
- Department of Biochemistry, School of Medical Sciences, University of Bristol, University Walk, Clifton, Bristol, BS81TD, United Kingdom
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20
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A zinc-finger transcriptional activator designed to interact with the gamma-globin gene promoters enhances fetal hemoglobin production in primary human adult erythroblasts. Blood 2010; 115:3033-41. [PMID: 20190190 DOI: 10.1182/blood-2009-08-240556] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Fetal hemoglobin (HbF) is a potent genetic modifier of the severity of beta-thalassemia and sickle cell anemia. We used an in vitro culture model of human erythropoiesis in which late-stage erythroblasts are derived directly from human CD34(+) hematopoietic cells to evaluate HbF production. This system recapitulates expression of globin genes according to the developmental stage of the originating cell source. When cytokine-mobilized peripheral blood CD34(+) cells from adults were cultured, background levels of HbF were 2% or less. Cultured cells were readily transduced with lentiviral vectors when exposed to vector particles between 48 and 72 hours. Among the genetic elements that may enhance fetal hemoglobin production is an artificial zinc-finger transcription factor, GG1-VP64, designed to interact with the proximal gamma-globin gene promoters. Our data show that lentiviral-mediated, enforced expression of GG1-VP64 under the control of relatively weak erythroid-specific promoters induced significant amounts of HbF (up to 20%) in erythroblasts derived from adult CD34(+) cells without altering their capacity for erythroid maturation and only modestly reducing the total numbers of cells that accumulate in culture after transduction. These observations demonstrate the potential for sequence-specific enhancement of HbF in patients with beta-thalassemia or sickle cell anemia.
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21
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Lausen J, Pless O, Leonard F, Kuvardina ON, Koch B, Leutz A. Targets of the Tal1 transcription factor in erythrocytes: E2 ubiquitin conjugase regulation by Tal1. J Biol Chem 2009; 285:5338-46. [PMID: 20028976 DOI: 10.1074/jbc.m109.030296] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Tal1 transcription factor is essential for the development of the hematopoietic system and plays a role during definitive erythropoiesis in the adult. Despite the importance of Tal1 in erythropoiesis, only a small number of erythroid differentiation target genes are known. A chromatin precipitation and cloning approach was established to uncover novel Tal1 target genes in erythropoiesis. The BirA tag/BirA ligase biotinylation system in combination with streptavidin chromatin precipitation (Strep-CP) was used to co-precipitate genomic DNA bound to Tal1. Tal1 was found to bind in the vicinity of 31 genes including the E2-ubiquitin conjugase UBE2H gene. Binding of Tal1 to UBE2H was confirmed by chromatin immunoprecipitation. UBE2H expression is increased during erythroid differentiation of hCD34(+) cells. Tal1 expression activated UBE2H expression, whereas Tal1 knock-down reduced UBE2H expression and ubiquitin transfer activity. This study identifies parts of the ubiquitinylation machinery as a cellular target downstream of the transcription factor Tal1 and provides novel insights into Tal1-regulated erythropoiesis.
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Affiliation(s)
- Jörn Lausen
- Georg-Speyer-Haus, Institute for Biomedical Research, D-60596 Frankfurt (Main), Germany.
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