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Qanash H, Li Y, Smith RH, Linask K, Young-Baird S, Hakami W, Keyvanfar K, Choy JS, Zou J, Larochelle A. Eltrombopag Improves Erythroid Differentiation in a Human Induced Pluripotent Stem Cell Model of Diamond Blackfan Anemia. Cells 2021; 10:734. [PMID: 33810313 PMCID: PMC8065708 DOI: 10.3390/cells10040734] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 03/17/2021] [Accepted: 03/22/2021] [Indexed: 12/15/2022] Open
Abstract
Diamond Blackfan Anemia (DBA) is a congenital macrocytic anemia associated with ribosomal protein haploinsufficiency. Ribosomal dysfunction delays globin synthesis, resulting in excess toxic free heme in erythroid progenitors, early differentiation arrest, and pure red cell aplasia. In this study, DBA induced pluripotent stem cell (iPSC) lines were generated from blood mononuclear cells of DBA patients with inactivating mutations in RPS19 and subjected to hematopoietic differentiation to model disease phenotypes. In vitro differentiated hematopoietic cells were used to investigate whether eltrombopag, an FDA-approved mimetic of thrombopoietin with robust intracellular iron chelating properties, could rescue erythropoiesis in DBA by restricting the labile iron pool (LIP) derived from excessive free heme. DBA iPSCs exhibited RPS19 haploinsufficiency, reduction in the 40S/60S ribosomal subunit ratio and early erythroid differentiation arrest in the absence of eltrombopag, compared to control isogenic iPSCs established by CRISPR/Cas9-mediated correction of the RPS19 point mutation. Notably, differentiation of DBA iPSCs in the presence of eltrombopag markedly improved erythroid maturation. Consistent with a molecular mechanism based on intracellular iron chelation, we observed that deferasirox, a clinically licensed iron chelator able to permeate into cells, also enhanced erythropoiesis in our DBA iPSC model. In contrast, erythroid maturation did not improve substantially in DBA iPSC differentiation cultures supplemented with deferoxamine, a clinically available iron chelator that poorly accesses LIP within cellular compartments. These findings identify eltrombopag as a promising new therapeutic to improve anemia in DBA.
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Affiliation(s)
- Husam Qanash
- Cellular and Molecular Therapeutics Branch, National Heart, Lung and Blood Institute (NHLBI), National Institutes of Health (NIH), Bethesda, MD 20892, USA; (H.Q.); (Y.L.); (R.H.S.); (W.H.)
- Department of Biology, Catholic University of America, Washington, DC 20064, USA;
- Department of Medical Laboratory Science, College of Applied Medical Sciences, The University of Hail, Hail 55476, Saudi Arabia
| | - Yongqin Li
- Cellular and Molecular Therapeutics Branch, National Heart, Lung and Blood Institute (NHLBI), National Institutes of Health (NIH), Bethesda, MD 20892, USA; (H.Q.); (Y.L.); (R.H.S.); (W.H.)
| | - Richard H. Smith
- Cellular and Molecular Therapeutics Branch, National Heart, Lung and Blood Institute (NHLBI), National Institutes of Health (NIH), Bethesda, MD 20892, USA; (H.Q.); (Y.L.); (R.H.S.); (W.H.)
| | - Kaari Linask
- iPSC Core Facility, NHLBI, NIH, Bethesda, MD 20892, USA; (K.L.); (J.Z.)
| | - Sara Young-Baird
- Eunice Kennedy Shriver, National Institute of Child Health and Human Development, NIH, Bethesda, MD 20892, USA;
- National Institute of General Medical Sciences (NIGMS), NIH, Bethesda, MD 20892, USA
| | - Waleed Hakami
- Cellular and Molecular Therapeutics Branch, National Heart, Lung and Blood Institute (NHLBI), National Institutes of Health (NIH), Bethesda, MD 20892, USA; (H.Q.); (Y.L.); (R.H.S.); (W.H.)
- Department of Biology, Catholic University of America, Washington, DC 20064, USA;
- Department of Medical Laboratories Technology, College of Applied Medical Sciences, Jazan University, Jazan 45142, Saudi Arabia
| | - Keyvan Keyvanfar
- Clinical Flow Core Facility, NHLBI, NIH, Bethesda, MD 20892, USA;
| | - John S. Choy
- Department of Biology, Catholic University of America, Washington, DC 20064, USA;
| | - Jizhong Zou
- iPSC Core Facility, NHLBI, NIH, Bethesda, MD 20892, USA; (K.L.); (J.Z.)
| | - Andre Larochelle
- Cellular and Molecular Therapeutics Branch, National Heart, Lung and Blood Institute (NHLBI), National Institutes of Health (NIH), Bethesda, MD 20892, USA; (H.Q.); (Y.L.); (R.H.S.); (W.H.)
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Abstract
Maintenance of the cellular homeostasis is firmly linked with protein synthesis. Therefore, it is tightly controlled at multiple levels. An advancement in quantitative techniques, mainly over the last decade, shed new light on the regulation of protein production, which pointed the ribosome as a new player. Ribosomes are macromolecular machines that synthesize polypeptide chains using mRNA as a template. The enormous complexity of ribosomes provides many possibilities of changes in their composition and consecutively in their target specificity. However, it is not clear how this specialization is enforced by the cell and which stimuli provoke that diversity. This review presents an overview of currently available knowledge about ribosome heterogeneity, focusing on changes in protein composition, and their role in the control of translation specificity. Importantly, besides the potential advantage of ribosome-mediated regulation of protein synthesis, its failure can play a crucial role in disease development.
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Affiliation(s)
- Karolina Gościńska
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Department of Genetics, Warszawa, Poland
| | - Ulrike Topf
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Department of Genetics, Warszawa, Poland
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3
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Iskander D, Roberts I, Rees C, Szydlo R, Alikian M, Neale M, Harrington Y, Kelleher P, Karadimitris A, de la Fuente J. Impaired cellular and humoral immunity is a feature of Diamond-Blackfan anaemia; experience of 107 unselected cases in the United Kingdom. Br J Haematol 2019; 186:321-326. [PMID: 30980390 DOI: 10.1111/bjh.15915] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 02/25/2019] [Indexed: 11/30/2022]
Abstract
Diamond-Blackfan anaemia (DBA) is a rare bone marrow failure syndrome characterised by anaemia, congenital anomalies and cancer predisposition. Although infections are the second leading cause of mortality in non-transplanted patients, immune function is largely unexplored. We identified quantitative deficits in serum immunoglobulins and/or circulating T, natural killer and B lymphocytes in 59 of 107 unselected patients (55·1%) attending our centre over a 7-year period. Immune abnormalities were independent of ribosomal protein genotype and arose in both steroid-treated and steroid-untreated patients. In summary, these data highlight the high prevalence and spectrum of infections and immune defects in DBA.
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Affiliation(s)
- Deena Iskander
- Centre for Haematology, Department of Medicine, Hammersmith Hospital, Imperial College London, London, UK
| | - Irene Roberts
- Department of Paediatrics and MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford University and BRC Blood Theme, NIHR Oxford Biomedical Centre, Oxford, UK
| | - Clare Rees
- Centre for Haematology, Department of Medicine, Hammersmith Hospital, Imperial College London, London, UK
| | - Richard Szydlo
- Centre for Haematology, Department of Medicine, Hammersmith Hospital, Imperial College London, London, UK
| | - Mary Alikian
- Centre for Haematology, Department of Medicine, Hammersmith Hospital, Imperial College London, London, UK
- Imperial Molecular Pathology Laboratory, Imperial College Healthcare NHS Trust and Academic Health Sciences Centre, Hammersmith Hospital, London, UK
| | - Michael Neale
- Centre for Haematology, Department of Medicine, Hammersmith Hospital, Imperial College London, London, UK
| | - Yvonne Harrington
- Paediatric Haematology and Bone Marrow Transplant, Department of Paediatrics, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK
| | - Peter Kelleher
- Centre for Immunology and Vaccinology, Department of Medicine, Chelsea & Westminster Hospital, Imperial College London, London, UK
| | - Anastasios Karadimitris
- Centre for Haematology, Department of Medicine, Hammersmith Hospital, Imperial College London, London, UK
| | - Josu de la Fuente
- Centre for Haematology, Department of Medicine, Hammersmith Hospital, Imperial College London, London, UK
- Paediatric Haematology and Bone Marrow Transplant, Department of Paediatrics, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK
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Migliaccio AR, Varricchio L. Concise Review: Advanced Cell Culture Models for Diamond Blackfan Anemia and Other Erythroid Disorders. Stem Cells 2018; 36:172-179. [PMID: 29124822 PMCID: PMC5785423 DOI: 10.1002/stem.2735] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 10/14/2017] [Accepted: 11/01/2017] [Indexed: 01/26/2023]
Abstract
In vitro surrogate models of human erythropoiesis made many contributions to our understanding of the extrinsic and intrinsic regulation of this process in vivo and how they are altered in erythroid disorders. In the past, variability among the levels of hemoglobin F produced by adult erythroblasts generated in vitro by different laboratories identified stage of maturation, fetal bovine serum, and accessory cells as "confounding factors," that is, parameters intrinsically wired in the experimental approach that bias the results observed. The discovery of these factors facilitated the identification of drugs that accelerate terminal maturation or activate specific signaling pathways for the treatment of hemoglobinopathies. It also inspired studies to understand how erythropoiesis is regulated by macrophages present in the erythroid islands. Recent cell culture advances have greatly increased the number of human erythroid cells that can be generated in vitro and are used as experimental models to study diseases, such as Diamond Blackfan Anemia, which were previously poorly amenable to investigation. However, in addition to the confounding factors already identified, improvement in the culture models has introduced novel confounding factors, such as possible interactions between signaling from cKIT, the receptor for stem cell factor, and from the glucocorticoid receptor, the cell proliferation potential and the clinical state of the patients. This review will illustrate these new confounding factors and discuss their clinical translation potential to improve our understanding of Diamond Blackfan Anemia and other erythroid disorders. Stem Cells 2018;36:172-179.
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Affiliation(s)
- Anna Rita Migliaccio
- Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
- Department of Biomedical and Neuromotorial Sciences, Alma Mater University, Bologna, Italy
| | - Lilian Varricchio
- Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
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Abstract
A mutation in the gene encoding the small subunit-associated ribosomal protein RPS19, leading to RPS19 haploinsufficiency, is one of the ribosomal protein gene defects responsible for the rare inherited bone marrow failure syndrome Diamond Blackfan anemia (DBA). Additional inherited and acquired defects in ribosomal proteins (RPs) continue to be identified and are the basis for a new class of diseases called the ribosomopathies. Acquired RPS14 haploinsufficiency has been found to be causative of the bone marrow failure found in 5q- myelodysplastic syndromes. Both under- and overexpression of RPs have also been implicated in several malignancies. This review will describe the somatic ribosomopathies that have been found to be associated with a variety of solid tumors as well as leukemia and will review cancers in which over- or underexpression of these proteins seem to be associated with outcome.
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Affiliation(s)
- Adrianna Vlachos
- Feinstein Institute for Medical Research, Cohen Children's Medical Center, Division of Hematology/Oncology and Stem Cell Transplantation, Zucker School of Medicine, Hofstra/Northwell, Manhasset, NY
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Ardissino G, Salardi S, Berra S, Colussi G, Cugno M, Zecca M, Giglio F, Peccatori J, Diral E, Tel F, Clivio A, Tedeschi S. Acquired Complement Regulatory Gene Mutations and Hematopoietic Stem Cell Transplant-Related Thrombotic Microangiopathy. Biol Blood Marrow Transplant 2017; 23:1580-1582. [PMID: 28522344 DOI: 10.1016/j.bbmt.2017.05.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 05/09/2017] [Indexed: 01/19/2023]
Abstract
Hematopoietic stem cell transplant-related thrombotic microangiopathy (HSCT-TMA) is a severe complication whose pathophysiology is unknown. We describe 6 patients in which the disease was associated with complement regulatory gene abnormalities received from their respective donors. It is suggested that mutated and transplanted monocyte-derived cells are responsible for production of abnormal proteins, complement dysregulation, and, ultimately, for the disease. This observation might have important drawbacks as far as HSCT-TMA pathophysiology and treatment are concerned.
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Affiliation(s)
- Gianluigi Ardissino
- Center for HUS Control, Prevention and Management, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy.
| | - Stefania Salardi
- Laboratory of Medical Genetics, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Silvia Berra
- Dipartimento di Scienze Biomediche e Cliniche "Luigi Sacco", Università di Milano, Italy
| | - Giacomo Colussi
- S.C. Nefrologia, Grande Ospedale Metropolitano Niguarda, Milano, Italy
| | - Massimo Cugno
- Medicina Interna, Dipartimento di Fisiopatologia Medico Chirurgica, Università degli Studi di Milano, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Marco Zecca
- Pediatric Hematology/Oncology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Fabio Giglio
- Hematology and Bone Marrow Transplantation Unit, IRCCS San Raffaele Scientific Institute, Milano, Italy
| | - Jacopo Peccatori
- Hematology and Bone Marrow Transplantation Unit, IRCCS San Raffaele Scientific Institute, Milano, Italy
| | - Elisa Diral
- Divisione di Ematologia e CTA, Ospedale San Gerardo, Monza, Italy
| | - Francesca Tel
- Center for HUS Control, Prevention and Management, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Alberto Clivio
- Dipartimento di Scienze Biomediche e Cliniche "Luigi Sacco", Università di Milano, Italy
| | - Silvana Tedeschi
- Laboratory of Medical Genetics, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
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7
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Alkhunaizi E, Schrewe B, Alizadehfar R, Vézina C, Stewart GS, Braverman N. Novel 3q27.2-qter deletion in a patient with Diamond-Blackfan anemia and immunodeficiency: Case report and review of literature. Am J Med Genet A 2017; 173:1514-1520. [PMID: 28432740 DOI: 10.1002/ajmg.a.38208] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 11/20/2016] [Accepted: 02/08/2017] [Indexed: 12/31/2022]
Abstract
3q27.2-qter deletion syndromes feature an overlapping set of terminal and interstitial deletions with variable congenital malformations. Diamond-Blackfan anemia (DBA) is etiologically heterogeneous disorder in which one cause is dominant mutations of the RPL35A gene on 3q29. We report a child with a 3q27.2-qter deletion that contains the RPL35A gene. She had clinical and laboratory features consistent with DBA and as well, an unexplained immunodeficiency disorder. Given these unusual findings, we reviewed other patients in the literature with overlapping genomic deletions. In addition, we evaluated our patient for the immunodeficiency disorder, RIDDLE syndrome, due to recessive mutations in the RNF168 gene on 3q29. A PubMed search for case reports of 3q27.2-qter overlapping deletions was performed. To determine if RPL35A was in the deletion region, the chromosomal regions reported were mapped to genomic regions using the UCSC Genome Browser. We identified 85 overlapping deletions, of which six included the RPL35A gene and all should be had DBA. Interestingly, none of the reported cases had immunodeficiency. To evaluate RIDDLE syndrome (radiosensitivity, immunodeficiency, dysmorphic features, and learning difficulties), we sequenced the remaining RNF168 gene and examined her fibroblast culture for a DNA double strand break repair deficiency. These results were normal, indicating that the immunodeficiency is unlikely to result from a RNF168 deficiency. We show that RPL35A haploinsufficiency is a cause of DBA and we report a novel case with 3q27.2-qter deletion and immunodeficiency. The etiology for the immunodeficiency remains unsolved and could be caused by an unknown gene effect or consequent to the DBA phenotype.
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Affiliation(s)
- Ebba Alkhunaizi
- Department of Medical Genetics and Pediatrics, McGill University Health Centre, Montréal, Quebec, Canada
| | - Brett Schrewe
- Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Reza Alizadehfar
- Department of Pediatric Allergy and Immunology, McGill University Health Centre, Montréal, Quebec, Canada
| | - Catherine Vézina
- Department of Pediatric Hematology and Oncology, McGill University Health Centre, Montréal, Quebec, Canada
| | - Grant S Stewart
- Institute for Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK
| | - Nancy Braverman
- Department of Medical Genetics and Pediatrics, McGill University Health Centre, Montréal, Quebec, Canada
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8
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Abstract
Pure red cell aplasia (PRCA) is a syndrome defined by a normocytic normochromic anemia with severe reticulocytopenia and marked reduction or absence of erythroid precursors from the bone marrow. Diamond-Blackfan anemia is a congenital form of PRCA. Acquired PRCA may be either a primary disorder or secondary to some other disorder or agent. Primary acquired PRCA is an autoimmune disorder that is frequently antibody-mediated. Myelodysplastic syndromes may also present with the morphologic appearance of PRCA. Secondary acquired PRCA may be associated with collagen vascular/autoimmune disorders such as systemic lupus erythematosus; lymphoproliferative disorders such as chronic lymphocytic leukemia or large granular lymphocyte leukemia; infections, particularly B19 parvovirus; thymoma and other solid tumors; or a variety of other disorders, drugs, or toxic agents. The therapeutic approach to PRCA typically involves immunosuppression, but specific pathogenic subtypes are associated with specific therapeutic approaches. Cyclosporine A, with or without concurrent corticosteroids, appears to be the single most effective immunosuppressive agent.
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MESH Headings
- Adrenal Cortex Hormones/therapeutic use
- Anemia, Diamond-Blackfan/drug therapy
- Anemia, Diamond-Blackfan/immunology
- Anemia, Diamond-Blackfan/pathology
- Autoimmune Diseases/drug therapy
- Autoimmune Diseases/immunology
- Autoimmune Diseases/pathology
- Cyclosporine/therapeutic use
- Humans
- Immunosuppressive Agents/therapeutic use
- Leukemia, Large Granular Lymphocytic/drug therapy
- Leukemia, Large Granular Lymphocytic/immunology
- Leukemia, Large Granular Lymphocytic/pathology
- Leukemia, Lymphocytic, Chronic, B-Cell/drug therapy
- Leukemia, Lymphocytic, Chronic, B-Cell/immunology
- Leukemia, Lymphocytic, Chronic, B-Cell/pathology
- Myelodysplastic Syndromes/drug therapy
- Myelodysplastic Syndromes/etiology
- Myelodysplastic Syndromes/immunology
- Myelodysplastic Syndromes/pathology
- Parvoviridae Infections/drug therapy
- Parvoviridae Infections/immunology
- Parvoviridae Infections/pathology
- Parvovirus B19, Human/immunology
- Thymoma/drug therapy
- Thymoma/immunology
- Thymoma/pathology
- Vasculitis/drug therapy
- Vasculitis/immunology
- Vasculitis/pathology
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Affiliation(s)
- Robert T Means
- Office of the Dean, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN
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9
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Kubik-Zahorodna A, Schuster B, Kanchev I, Sedláček R. Neurological Deficits of an Rps19(Arg67del) Model of Diamond-Blackfan Anaemia. Folia Biol (Praha) 2016; 62:139-147. [PMID: 27643579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Diamond-Blackfan anaemia is a rare disease caused by insufficient expression of ribosomal proteins and is characterized by erythroid hypoplasia often accompanied by growth retardation, congenital craniofacial and limb abnormalities. In addition, Diamond-Blackfan anaemia patients also exhibit a number of behavioural abnormalities. In this study we describe the behavioural effects observed in a new mouse mutant carrying a targeted single amino acid deletion in the ribosomal protein RPS19. This mutant, created by the deletion of arginine 67 in RPS19, exhibits craniofacial, skeletal, and brain abnormalities, accompanied by various neurobehavioural malfunctions. A battery of behavioural tests revealed a moderate cognitive impairment and neuromuscular dysfunction resulting in profound gait abnormalities. This novel Rps19 mutant shows behavioural phenotypes resembling that of the human Diamond-Blackfan anaemia syndrome, thus creating the possibility to use this mutant as a unique murine model for studying the molecular basis of ribosomal protein deficiencies.
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Affiliation(s)
- A Kubik-Zahorodna
- Laboratory of Transgenic Models of Diseases, Division BIOCEV, Institute of Molecular Genetics of the ASCR, v. v. i., Prague, Czech Republic
| | - B Schuster
- Laboratory of Transgenic Models of Diseases, Division BIOCEV, Institute of Molecular Genetics of the ASCR, v. v. i., Prague, Czech Republic
| | - I Kanchev
- Laboratory of Transgenic Models of Diseases, Division BIOCEV, Institute of Molecular Genetics of the ASCR, v. v. i., Prague, Czech Republic
| | - R Sedláček
- Laboratory of Transgenic Models of Diseases, Division BIOCEV, Institute of Molecular Genetics of the ASCR, v. v. i., Prague, Czech Republic
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10
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Heijnen HF, van Wijk R, Pereboom TC, Goos YJ, Seinen CW, van Oirschot BA, van Dooren R, Gastou M, Giles RH, van Solinge W, Kuijpers TW, Gazda HT, Bierings MB, Da Costa L, MacInnes AW. Ribosomal protein mutations induce autophagy through S6 kinase inhibition of the insulin pathway. PLoS Genet 2014; 10:e1004371. [PMID: 24875531 PMCID: PMC4038485 DOI: 10.1371/journal.pgen.1004371] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 03/24/2014] [Indexed: 12/19/2022] Open
Abstract
Mutations affecting the ribosome lead to several diseases known as ribosomopathies, with phenotypes that include growth defects, cytopenia, and bone marrow failure. Diamond-Blackfan anemia (DBA), for example, is a pure red cell aplasia linked to the mutation of ribosomal protein (RP) genes. Here we show the knock-down of the DBA-linked RPS19 gene induces the cellular self-digestion process of autophagy, a pathway critical for proper hematopoiesis. We also observe an increase of autophagy in cells derived from DBA patients, in CD34+ erythrocyte progenitor cells with RPS19 knock down, in the red blood cells of zebrafish embryos with RP-deficiency, and in cells from patients with Shwachman-Diamond syndrome (SDS). The loss of RPs in all these models results in a marked increase in S6 kinase phosphorylation that we find is triggered by an increase in reactive oxygen species (ROS). We show that this increase in S6 kinase phosphorylation inhibits the insulin pathway and AKT phosphorylation activity through a mechanism reminiscent of insulin resistance. While stimulating RP-deficient cells with insulin reduces autophagy, antioxidant treatment reduces S6 kinase phosphorylation, autophagy, and stabilization of the p53 tumor suppressor. Our data suggest that RP loss promotes the aberrant activation of both S6 kinase and p53 by increasing intracellular ROS levels. The deregulation of these signaling pathways is likely playing a major role in the pathophysiology of ribosomopathies. Diseases linked to mutations affecting the ribosome, ribosomopathies, have an exceptionally wide range of phenotypes. However, many ribosomopathies have some features in common including cytopenia and growth defects. Our study aims to clarify the mechanisms behind these common phenotypes. We find that mutations in ribosomal protein genes result in a series of aberrant signaling events that cause cells to start recycling and consuming their own intracellular contents. This basic mechanism of catabolism is activated when cells are starving for nutrients, and also during the tightly regulated process of blood cell maturation. The deregulation of this mechanism provides an explanation as to why blood cells are so acutely affected by mutations in genes that impair the ribosome. Moreover, we find that the signals activating this catabolism are coupled to impairment of the highly conserved insulin-signaling pathway that is essential for growth. Taken together, our in-depth description of the pathways involved as the result of mutations affecting the ribosome increases our understanding about the etiology of these diseases and opens up previously unknown avenues of potential treatment.
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Affiliation(s)
- Harry F. Heijnen
- Cell Microscopy Center, Department of Cell Biology, University Medical Center Utrecht, Utrecht, The Netherlands
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Richard van Wijk
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Tamara C. Pereboom
- Hubrecht Institute, KNAW and University Medical Center Utrecht, The Netherlands
| | - Yvonne J. Goos
- Hubrecht Institute, KNAW and University Medical Center Utrecht, The Netherlands
| | - Cor W. Seinen
- Cell Microscopy Center, Department of Cell Biology, University Medical Center Utrecht, Utrecht, The Netherlands
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Brigitte A. van Oirschot
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Rowie van Dooren
- Hubrecht Institute, KNAW and University Medical Center Utrecht, The Netherlands
| | - Marc Gastou
- U1009, Institut Gustave Roussy, Université Paris-Sud, Villejuif, France
| | - Rachel H. Giles
- Department of Nephrology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Wouter van Solinge
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Taco W. Kuijpers
- Department of Pediatric Hematology, Immunology and Infectious Diseases, Emma Children's Hospital, Academic Medical Center (AMC), Amsterdam, The Netherlands
| | - Hanna T. Gazda
- Division of Genetics and Genomics, The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, Massachusetts, United States of America
- Harvard Medical School, Boston, Massachusetts, United States of America
- Broad Institute, Cambridge, Massachusetts, United States of America
| | - Marc B. Bierings
- Department of Pediatric Hematology/Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Lydie Da Costa
- AP-HP, Service d'Hématologie Biologique, Hôpital Robert Debré, Paris, France
- Université Paris VII-Denis Diderot, Sorbonne Paris Cité, Paris, France
- U773, CRB3, Paris, France
| | - Alyson W. MacInnes
- Hubrecht Institute, KNAW and University Medical Center Utrecht, The Netherlands
- * E-mail:
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11
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Bolze A. [Connecting isolated congenital asplenia to the ribosome]. Biol Aujourdhui 2014; 208:289-98. [PMID: 25840456 DOI: 10.1051/jbio/2015001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Indexed: 11/14/2022]
Abstract
Isolated congenital asplenia is characterized by the absence of a spleen at birth without any other developmental defect. Isolated congenital asplenia is a rare and life-threatening disease that predisposes patients to severe bacterial infections. The first and main genetic etiology of isolated congenital asplenia was discovered in 2013. Mutations in the gene RPSA, which encodes ribosomal protein SA, cause more than half of the cases of isolated congenital asplenia. These disease-causing mutations lead to haploinsufficiency of RPSA. Haploinsufficiency of genes encoding other ribosomal proteins have been reported to cause other developmental defects in humans, and in model organisms like the fly or the mouse. About half of the patients with Diamond-Blackfan anemia, which is a well-characterized ribosomopathy, present developmental defects such as craniofacial defects, cardiac defects or thumb abnormalities. The mechanism of pathogenesis linking mutations in ribosomal proteins, which are highly and ubiquitously expressed, to specific developmental defects remains to be elucidated. One hypothesis is that the ribosome, and ribosomal proteins in particular, regulate the expression of specific genes during development.
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Abstract
Diamond-Blackfan anemia is a rare hematological disease characterized by selective marrow erythroid hypoplasia. We present the clinical and hematological profile and results of treatment in four children. The median age at presentation was 14 months with a median age of onset of pallor at 7.5 months. Mean Hb at presentation was 2.9 g/dl. All children were started on prednisolone with response in one child. One child was switched to dexamethasone and responded transiently relapsing in 4 months but responded to further dexamethasone. Two children required cyclosporin for 3 and 8 weeks for response. With median follow-up of 59 months, all four children continue in complete hematological remission with no further relapses.
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Affiliation(s)
- Rahul Naithani
- Department of Pediatrics, Kalawati Saran Childrens Hospital, Lady Hardinge Medical College, New Delhi 110001, India.
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13
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Noetzli LJ, Panigrahy A, Mittelman SD, Hyderi A, Dongelyan A, Coates TD, Wood JC. Pituitary iron and volume predict hypogonadism in transfusional iron overload. Am J Hematol 2012; 87:167-71. [PMID: 22213195 DOI: 10.1002/ajh.22247] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Accepted: 11/02/2011] [Indexed: 11/10/2022]
Abstract
Hypogonadism is the most common morbidity in patients with transfusion-dependent anemias such as thalassemia major. We used magnetic resonance imaging (MRI) to measure pituitary R2 (iron) and volume to determine at what age these patients develop pituitary iron overload and volume loss. We recruited 56 patients (47 with thalassemia major, five with chronically transfused thalassemia intermedia and four with Blackfan-Diamond syndrome) to have pituitary MRIs to measure pituitary R2 and volume. Hypogonadism was defined clinically based on the timing of secondary sexual characteristics or the need for sex hormone replacement therapy. Patients with transfusional iron overload begin to develop pituitary iron overload in the first decade of life; however, clinically significant volume loss was not observed until the second decade of life. Severe pituitary iron deposition (Z > 5) and volume loss (Z < -2.5) were independently predictive of hypogonadism. Pituitary R2 correlated significantly with serum ferritin as well as liver, pancreatic, and cardiac iron deposition by MRI. Log pancreas R2* was the best single predictor for pituitary iron, with an area under the receiving operator characteristic curve of 0.88, but log cardiac R2* and ferritin were retained on multivariate regression with a combined r(2) of 0.71. Pituitary iron overload and volume loss were independently predictive of hypogonadism. Many patients with moderate-to-severe pituitary iron overload retained normal gland volume and function, representing a potential therapeutic window. The subset of hypogonadal patients having preserved gland volumes may also explain improvements in pituitary function observed following intensive chelation therapy.
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Affiliation(s)
- Leila J Noetzli
- Department of Pediatrics, Division of Cardiology, Children's Hospital Los Angeles, Los Angeles, CA, USA
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14
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Kvazireli-Kopadze MA, Pagava KI, Korinteli IA. [The congenital parcial erithroblastopenia--Diamond-Blackfan anemia]. Georgian Med News 2011:81-85. [PMID: 21617281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The article presents twenty-five year observation on 5 patients with Diamond-Blackfan anemia. In 2010 the new case of this pathology in neonate was diagnosed. Research suggests that rarely, the Diamond-Blackfan anemia may be may be the result of an aplastic anemia. To find out what the real cause of anemia is the number of reticulocytes and qualitative and quantitative indicators bone marrow should be investigated in newborns and infants.
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15
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Abstract
Mutations affecting genes encoding ribosomal proteins cause Diamond Blackfan anemia (DBA), a rare congenital syndrome associated with physical anomalies, short stature, red cell aplasia, and an increased risk of malignancy. p53 activation has been identified as a key component in the pathophysiology of DBA after cellular and molecular studies of knockdown cellular and animal models of DBA and other disorders affecting ribosomal assembly or function. Other potential mechanisms that warrant further investigation include impaired translation as the result of ribosomal insufficiency, which may be ameliorated by leucine supplementation, and alternative splicing leading to reduced expression of a cytoplasmic heme exporter, the human homolog of the receptor for feline leukemia virus C (FVLCR). However, the molecular basis for the characteristic steroid responsiveness of the erythroid failure in DBA remains unknown. This review explores the clinical and therapeutic implications of the current state of knowledge and delineates important but as-yet-unanswered questions.
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Affiliation(s)
- Sarah Ball
- St George's University of London, London, United Kingdom.
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16
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Miyake K, Utsugisawa T, Flygare J, Kiefer T, Hamaguchi I, Richter J, Karlsson S. Ribosomal protein S19 deficiency leads to reduced proliferation and increased apoptosis but does not affect terminal erythroid differentiation in a cell line model of Diamond-Blackfan anemia. Stem Cells 2007; 26:323-9. [PMID: 17962699 DOI: 10.1634/stemcells.2007-0569] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Diamond-Blackfan anemia (DBA) is a congenital red-cell aplasia in which 25% of the patients have a mutation in the ribosomal protein (RP) S19 gene. It is not known how the RPS19 deficiency impairs erythropoiesis and proliferation of hematopoietic progenitors. To elucidate molecular mechanisms in RPS19-deficient DBA, we analyzed the effects of RPS19 deficiency on erythropoietin (EPO)-induced signal transduction, cell cycle, and apoptosis in RPS19-deficient TF-1 cells. We did not find any abnormality in EPO-induced signal transduction. However, RPS19-deficient TF-1 cells showed G0/G1 arrest (82% vs. 58%; p < .05) together with accumulation of p21 and p27. The fraction of apoptotic cells detected by Annexin V analysis also increased compared with control cells (13% vs. 3.1%; p < .05). Western blot analysis of apoptosis-related proteins showed that the level of bcl-2 and Bad was decreased and Bax was increased in RPS19-deficient TF-1 cells. Moreover, primary CD34-positive cells from DBA patients detected by Annexin V analysis also generated a higher number of apoptotic cells compared with normal CD34-positive cells during in vitro culture (38% vs. 8.9%; n = 5; p < .001). Finally, we show that although RPS19 silencing reduces EPO-induced development of erythroid progenitors expressing glycophorin A (GPA), RPS19 silencing in cells already expressing GPA does not affect GPA expression. These findings indicate that RPS19 deficiency causes apoptosis and accelerated loss of erythroid progenitors in RPS19-deficient DBA.
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Affiliation(s)
- Koich Miyake
- Molecular Medicine and Gene Therapy, Lund University, BMC A12, 221 84, Lund, Sweden
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17
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Leblanc TM, Da Costa L, Marie I, Demolis P, Tchernia G. Metoclopramide treatment in DBA patients: no complete response in a French prospective study. Blood 2007; 109:2266-7. [PMID: 17312003 DOI: 10.1182/blood-2006-08-039545] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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18
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Abstract
Diamond-Blackfan anemia (DBA) is a congenital erythroid aplasia that usually presents as macrocytic anemia during infancy. Linkage analysis suggests that at least 4 genes are associated with DBA of which 2 have been identified so far. The known DBA genes encode the ribosomal proteins S19 and S24 accounting for 25% and 2% of the patients, respectively. Herein, we review possible links between ribosomal proteins and erythropoiesis that might explain DBA pathogenesis. Recent studies and emerging findings suggest that a malfunctioning translational machinery may be a cause of anemia in patients with DBA.
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Affiliation(s)
- Johan Flygare
- Department of Molecular Medicine and Gene Therapy, Institute of Molecular Medicine, and Lund Strategic Research Center for Stem Cell Biology and Cell Therapy, Lund University, A12 221-84 Lund, Sweden.
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19
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Cmejlova J, Dolezalova L, Pospisilova D, Petrtylova K, Petrak J, Cmejla R. Translational efficiency in patients with Diamond-Blackfan anemia. Haematologica 2006; 91:1456-64. [PMID: 17082006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023] Open
Abstract
BACKGROUND AND OBJECTIVES Diamond-Blackfan anemia (DBA) is a rare congenital pure red cell aplasia characterized by normochromic macrocytic anemia, reticulocytopenia, and normocellular bone marrow with a selective deficiency of erythroid precursors. Ribosomal protein S19 (RPS19), currently the only gene associated with DBA, is mutated in 25% of DBA patients, but its role in erythropoiesis is unknown. We attempted to elucidate the importance of RPS19 in translation in relation to the pathogenesis of DBA. DESIGN AND METHODS We measured translation and proliferation rates in unstimulated and phytohemagglutinin (PHA)-stimulated lymphocytes isolated from DBA patients, as well as in K562 cells expressing several RPS19 mutants to directly test the effect of RPS19 mutations on translation. The effect of leucine on overall translation was also studied. RESULTS We found that the level of translation was on average 48-73% of controls in both unstimulated and PHA-activated DBA lymphocytes irrespective of mutations in RPS19. The addition of leucine increased the translational level in RPS19-non-mutated DBA cells, but not in cells with an RPS19 mutation. In unstimulated DBA cells, proliferation was significantly impaired in both RPS19-mutated and non-mutated cells, but in both groups could be efficiently activated by PHA. Studies on K562 cells showed that RPS19 mutations affecting RPS19 conserved arginines R56Q and R62Q could significantly inhibit the rate of protein synthesis, indicating the importance of RPS19 in translation. INTERPRETATION AND CONCLUSIONS Our results indicate that inefficient translation may be the main cause of DBA, and administration of leucine may be beneficial for at least some DBA patients.
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Affiliation(s)
- Jana Cmejlova
- Department of Cell Physiology, Institute of Hematology and Blood Transfusion, U Nemocnice 1, 128 20, Prague, Czech Republic.
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20
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Cmejlova J, Cerna Z, Votava T, Pospisilova D, Cmejla R. Identification of a new in-frame deletion of six amino acids in ribosomal protein S19 in a patient with Diamond-Blackfan anemia. Blood Cells Mol Dis 2006; 36:337-41. [PMID: 16531079 DOI: 10.1016/j.bcmd.2006.01.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2006] [Accepted: 01/19/2006] [Indexed: 11/23/2022]
Abstract
Ribosomal protein S19 (RPS19) is currently the only gene associated with Diamond-Blackfan anemia (DBA), a rare congenital pure red cell aplasia characterized by normochromic macrocytic anemia, reticulocytopenia, and normocellular bone marrow with a selective deficiency of erythroid precursors. RPS19 is mutated in 25% of DBA patients, but its role in DBA pathogenesis remains elusive. We have identified a novel heterozygous microdeletion in RPS19 in a DBA patient presenting with profound anemia after birth. The deletion of 18 nucleotides (233-250; A in start codon is +1) in exon 4 leads to the elimination of 6 amino acids 78IYGGRQ83, affecting the most conserved stretch of three amino acids (YGG) in RPS19. The mutated allele was not detected in the patient's family members, indicating de novo mutation. Both alleles were expressed at the same level. Using an immunofluorescence technique, the mutated RPS19 protein localized to nucleoli, and its intracellular distribution did not differ from the wild-type RPS19. The deletion of only a few amino acids of this protein with a preserved reading frame is rare, and this type of a mutation could be very helpful in further experiments to define the role of the RPS19 protein in DBA pathogenesis.
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Affiliation(s)
- Jana Cmejlova
- Institute of Hematology and Blood Transfusion, U Nemocnice 1, Prague, 128 20, Czech Republic.
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21
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Abstract
A 14-month-old boy was referred to our hospital for evaluation of severe anemia. In the bone marrow aspiration smear, normal cellularity with severe erythroblastopenia (3%) was observed. The hemoglobin electrophoresis of the patient and his father were compatible with the beta-thalassemia trait. Because macrocytosis of Diamond-Blackfan anemia (DBA) is masked by microcytosis of beta-thalassemia trait, the diagnosis of DBA co-existing with beta-thalassemia trait might be challenging. We report herein a case of DBA co-existing with beta-thalassemia trait in a Turkish boy.
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Affiliation(s)
- Betül Tavil
- Hacettepe University Faculty of Medicine, Ihsan Dogramaci Children's Hospital, Pediatric Hematology Unit, Sihhiye, Ankara, Turkey.
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22
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Abstract
Diamond Blackfan anemia is characterized by a severe hypoplastic anemia and a heterogeneous collection of other clinical features. Approximately 25% of Diamond Blackfan anemia cases are associated with mutations in the gene encoding ribosomal protein S19. The hypothesis presented here ties together molecular and clinical features of the disease, and establishes a conceptual framework for understanding many of the unusual characteristics of a growing number of diseases linked to factors involved in ribosome synthesis. The hypothesis states that ribosomal proteins are expressed in amounts that differ relative to one another in a tissue-specific manner, and that haploinsufficiency for a particular protein may make that protein limiting for ribosome assembly in some tissues, while other tissues remain unaffected. Further, polymorphisms in factors controlling the expression of a particular ribosomal protein gene may alter its expression and expand or contract the number of tissues affected from individual to individual. Support for the hypothesis comes from the observation that promoters in ribosomal protein genes exhibit little conservation and transcription profiling indicates that the absolute amounts of mRNAs for individual ribosomal proteins can vary dramatically relative to one another. Balanced expression of ribosomal proteins is achieved post-translationally, where excess proteins not assembled into ribosomal subunits are often rapidly degraded. The number of ribosomes per cell is therefore determined by the factors that limit assembly. In principle, any essential ribosomal protein could become limiting for assembly if its level of expression falls below a critical threshold. Whether an inactivating mutation in ribosomal protein gene would affect protein synthetic capacity of a tissue would depend on the ratio of the ribosomal protein relative to other ribosomal proteins in that tissue. If the ratio were high, the tissue may not be affected as the level of functional protein may not fall to a point where it becomes limiting for subunit assembly. In contrast, if the ratio were low, an inactivating mutation could make the protein limiting for subunit assembly resulting in a clinical phenotype. Polymorphisms in the myriad of cis- and trans-acting factors, which govern the expression of ribosomal proteins in response to developmental and physiological signals, could act to increase or decrease ribosomal protein expression and thereby impact the profile and severity of clinical phenotypes. Therefore, these factors represent targets for the development of new therapies to treat Diamond Blackfan anemia and other ribosome based diseases.
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Affiliation(s)
- Steven R Ellis
- Department of Biochemistry and Molecular Biology, University of Louisville, 319 Abraham Flexner Way, Louisville, KY 40292, USA.
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23
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Gordon-Smith EC. Congenital bone marrow failure involving the red blood cells. ACTA ACUST UNITED AC 2005; 10 Suppl 1:312-5. [PMID: 16188693 DOI: 10.1080/10245330512331389962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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24
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Flygare J, Kiefer T, Miyake K, Utsugisawa T, Hamaguchi I, Da Costa L, Richter J, Davey EJ, Matsson H, Dahl N, Wiznerowicz M, Trono D, Karlsson S. Deficiency of ribosomal protein S19 in CD34+ cells generated by siRNA blocks erythroid development and mimics defects seen in Diamond-Blackfan anemia. Blood 2004; 105:4627-34. [PMID: 15626736 DOI: 10.1182/blood-2004-08-3115] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Diamond-Blackfan anemia (DBA) is a congenital red cell aplasia in which 25% of the patients have a mutation in the ribosomal protein S19 (RPS19) gene. To study effects of RPS19 deficiency in hematopoiesis we transduced CD34(+) umbilical cord blood (CB) and bone marrow (BM) cells with 3 lentiviral vectors expressing small interfering RNA (siRNA) against RPS19 and 1 scrambled control vector. All vectors also express green fluorescent protein (GFP). Transduction with the siRNA vectors reduced RPS19 mRNA levels to various degrees, which resulted in erythroid defects, correlating to the degree of RPS19 down-regulation, and was rescued by expression of an siRNA-resistant RPS19 transcript. Erythroid colony formation capacity conjointly decreased with RPS19 levels in CD34(+) CB and BM cells. In liquid culture supporting erythroid differentiation, RPS19-silenced as well as DBA patient CD34(+) cells exhibited reduced proliferative capacity and impaired erythroid differentiation resulting in fewer erythroid colony-forming units (CFU-Es). When assaying myeloid development, a less pronounced influence on proliferation was seen. This study shows for the first time that RPS19 silencing decreases the proliferative capacity of hematopoietic progenitors and leads to a defect in erythroid development.
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MESH Headings
- Anemia, Diamond-Blackfan/blood
- Anemia, Diamond-Blackfan/pathology
- Antigens, CD/biosynthesis
- Antigens, CD34/biosynthesis
- Antigens, Differentiation, B-Lymphocyte/biosynthesis
- Base Sequence
- Blotting, Northern
- Blotting, Western
- Bone Marrow Cells/cytology
- Cell Differentiation
- Cell Line
- Cell Proliferation
- Cell Separation
- Cloning, Molecular
- Down-Regulation
- Erythroid Precursor Cells/metabolism
- Flow Cytometry
- Gene Silencing
- Genetic Vectors
- Green Fluorescent Proteins/chemistry
- Green Fluorescent Proteins/metabolism
- Hematopoiesis
- Humans
- Image Processing, Computer-Assisted
- Lentivirus/genetics
- Molecular Sequence Data
- Phenotype
- RNA, Messenger/metabolism
- RNA, Small Interfering/metabolism
- Receptors, Transferrin
- Reverse Transcriptase Polymerase Chain Reaction
- Ribosomal Proteins/deficiency
- Ribosomal Proteins/physiology
- Ribosomes/metabolism
- Time Factors
- Transgenes
- Umbilical Cord/cytology
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Affiliation(s)
- Johan Flygare
- Molecular Medicine and Gene Therapy, Institute of Laboratory Medicine and The Lund Strategic Research Center for Stem Cell Biology and Cell Therapy, Lund University, Lund, Sweden
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25
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Beauchamp-Nicoud A, Da Costa L, Proust A, Rincé P, Saker S, Tchernia G. Postmortem diagnosis of Diamond-Blackfan anemia. J Pediatr Hematol Oncol 2004; 26:847-8. [PMID: 15591911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Abstract
Diamond-Blackfan anemia (DBA) is a rare etiology for congenital anemia, but this diagnosis should be considered when aregenerative hypoplastic anemia occurs in infancy. A term infant girl received a red blood cell transfusion at birth for neonatal anemia (hemoglobin 75 g/L) initially attributed to abruptio placentae. There were no additional investigations. Hemoglobin gradually decreased during the first 4 weeks of life, leading to severe anemia and death despite transfusions. A postmortem diagnosis of DBA was made by extraction of DNA collected on blood filter paper showing a deletion in RPS19 gene. Neonatal anemias should be carefully investigated and close follow-up should be performed during the first months of life, even if there is an obvious hemorrhagic etiology.
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Affiliation(s)
- Anne Beauchamp-Nicoud
- CHU Kremlin-Bicêtre, Laboratoire d'Hématologie, Hopital Bicêtre, 78 rue Général Leclerc, 92375 Le Kremlin-Bicêtre, France.
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26
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Abstract
The erythroid defect in Diamond Blackfan anemia (DBA) is known to be intrinsic to the stem cell, but its molecular pathophysiology remains obscure. Using a 2-phase liquid erythroid culture system, we have demonstrated a consistent defect in DBA, regardless of clinical severity, including 3 first-degree relatives with normal hemoglobin levels but increased erythrocyte adenosine deaminase activity. DBA cultures were indistinguishable from controls until the end of erythropoietin (Epo)-free phase 1, but failed to demonstrate the normal synchronized wave of erythroid expansion and terminal differentiation on exposure to Epo. Dexamethasone increased Epo sensitivity of erythroid progenitor cells, and enhanced erythroid expansion in phase 2 in both normal and DBA cultures. In DBA cultures treated with dexamethasone, Epo sensitivity was comparable to normal, but erythroid expansion remained subnormal. In clonogenic phase 2 cultures, the number of colonies did not significantly differ between normal cultures and DBA, in the presence or absence of dexamethasone, and at both low and high Epo concentrations. However, colonies were markedly smaller in DBA under all conditions. This suggests that the Epo-triggered onset of terminal maturation is intact in DBA, and the defect lies down-stream of the Epo receptor, influencing survival and/or proliferation of erythroid progenitors.
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Affiliation(s)
- Yaw Ohene-Abuakwa
- Department of Cellular and Molecular Sciences (Haematology), St George's Hospital Medical School, London, United Kingdom
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27
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Abstract
We present the case of three sisters with Diamond-Blackfan anemia (DBA) from a consanguineous marriage. These sisters presented within the first 2 months of age with anemia without hepatosplenomegaly together with complete blood count and bone marrow pictures compatible with the diagnosis of DBA syndrome. They were given blood transfusions and then started on prednisolone 2 mg/kg/day in divided doses, tapering the dose to a minimum to keep Hb around 90 g/l. DBA in these three sisters from a consanguineous marriage clearly illustrates the autosomal recessive mode of inheritance. The importance of early diagnosis and management with steroid is highlighted along with the need for consideration of other modalities of treatment in those cases not responding to steroid therapy.
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Affiliation(s)
- Mona H Bourhama
- Pediatric Hematology Unit, NBK Children Department, Al-Sabah Hospital, Kuwait.
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28
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Zivny J, Jelinek J, Pospisilova D, Plasilova M, Necas E, Stopka T. Diamond blackfan anemia stem cells fail to repopulate erythropoiesis in NOD/SCID mice. Blood Cells Mol Dis 2003; 31:93-7. [PMID: 12850491 DOI: 10.1016/s1079-9796(03)00115-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Diamond Blackfan Anemia (DBA) is a congenital disorder characterized by decreased red blood cell production and developmental abnormalities. We herein show that DBA progenitors produced lower numbers of phenotypically normal erythroid colonies in vitro, whereas nonerythroid colonies were normally abundant and developed. To determine whether DBA stem cells are capable of producing early erythroid, monocyto-granulocytic, and lymphoid progenitors in vivo we used a mouse xenotransplantation model. We demonstrate that DBA stem cells poorly repopulated erythroid progeny in NOD/SCID mice, whereas the monocyto-granulocytic and lymphoid progenies were repopulated normally. Therefore, we conclude that disordered DBA erythropoiesis may be a result of defective erythroid-lineage commitment and maintenance of early erythroid progenitors.
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Affiliation(s)
- Jan Zivny
- Department of Pathophysiology, Charles University, First Medical Faculty, Prague, Czech Republic.
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29
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Keller P, Debaun MR, Rothbaum RJ, Bessler M. Bone marrow failure in Shwachman-Diamond syndrome does not select for clonal haematopoiesis of the paroxysmal nocturnal haemoglobinuria phenotype. Br J Haematol 2002; 119:830-2. [PMID: 12437667 DOI: 10.1046/j.1365-2141.2002.03913.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Bone marrow failure is believed to be the underlying condition that drives the expansion of the paroxysmal nocturnal haemoglobinuria (PNH) clone. Indeed, circulating PNH blood cells have been identified in patients with acquired aplastic anaemia and with hypoplastic myelodysplasia. Whether PNH blood cells are also present in patients with inherited aplastic anaemia has not been reported. We screened a large group of patients diagnosed with Shwachman-Diamond Syndrome (SDS) for PNH blood cells. None of the patients analysed had detectable circulating PNH blood cells, indicating that bone marrow failure in SDS does not select for PNH progenitor cells.
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Affiliation(s)
- Peter Keller
- Department of Internal Medicine, Washington University School of Medicine, St Louis, MO 63110, USA
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30
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Abstract
Diamond-Blackfan anemia (DBA) is a rare congenital red blood cell aplasia. Usually, erythropoiesis in vitro is defective, and decreased numbers of erythroid progenitors are found in colony assays performed with bone marrow cells. Recently, some investigators showed that thrombopoietin (TPO) also works on common multipotent progenitor cells and stimulates erythropoiesis. We examined the effect of TPO together with erythropoietin (EPO), stem cell factor (SCF), and/or interleukin-3 (IL-3) on erythroid burst-forming units (BFU-E) of bone marrow nonadherent mononuclear cells from 2 patients with DBA using a serum-free culture system. Very few BFU-E appeared in cultures containing EPO alone. Adding IL-3, SCF, or both to cultures containing EPO induced an increase in the number of BFU-E. When TPO was added to cultures containing EPO and IL-3, SCF, or both, the number of BFU-E further increased. Especially in patient 2, BFU-E formation was grossly equal to that in normal controls. We conclude that TPO enhances bone marrow erythropoiesis in patients with DBA in the presence of EPO and SCF and/or IL-3. The data raise the possibility of the combination of TPO and SCF as a therapeutic agent in DBA.
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31
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Abstract
This chapter describes the clinical presentation and molecular basis of two inherited bone marrow failure syndromes, Fanconi anemia (FA), and Diamond-Blackfan anemia (DBA). It also provides an update on diagnostic and therapeutic approaches to bone marrow failure of all types (inherited and acquired) in pediatric patients. In Section I, Dr. Alan D'Andrea reviews the wide range of clinical manifestations of Fanconi anemia. Significant advances have been made in understanding the molecular pathogenesis of FA. On the basis of these advances, new diagnostic assays and treatment options are now available. In Section II, Dr. Niklas Dahl examines the clinical features and molecular pathogenesis of Diamond-Blackfan anemia. The possible links between the RPS19 gene (DBA gene) and the erythropoiesis defect are considered. In Section III, Drs. Eva Guinan and Akiko Shimamura provide an algorithm for the diagnostic evaluation and treatment of children with inherited or acquired aplastic anemia. Through the presentation of a case study of a pediatric patient with bone marrow failure, he provides an overview of the newest tests and treatment options.
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Affiliation(s)
- Alan D D'Andrea
- Dana-Farber Cancer Institute, Department of Pediatrics Oncology, Boston, MA 02115, USA
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