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Dzhus M, Ehlers L, Wouters M, Jansen K, Schrijvers R, De Somer L, Vanderschueren S, Baggio M, Moens L, Verhaaren B, Lories R, Bucciol G, Meyts I. A Narrative Review of the Neurological Manifestations of Human Adenosine Deaminase 2 Deficiency. J Clin Immunol 2023; 43:1916-1926. [PMID: 37548813 PMCID: PMC10661818 DOI: 10.1007/s10875-023-01555-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Accepted: 07/14/2023] [Indexed: 08/08/2023]
Abstract
Deficiency of human adenosine deaminase type 2 (DADA2) is a complex systemic autoinflammatory disorder characterized by vasculopathy, immune dysregulation, and hematologic abnormalities. The most notable neurological manifestations of DADA2 are strokes that can manifest with various neurological symptoms and are potentially fatal. However, neurological presentations can be diverse. We here present a review of the neurological manifestations of DADA2 to increase clinical awareness of DADA2 as the underlying diagnosis. We reviewed all published cases of DADA2 from 1 January 2014 until 19 July 2022 found via PubMed. A total of 129 articles describing the clinical features of DADA2 were included in the analysis. Six hundred twenty-eight patients diagnosed with DADA2 were included in the review. 50.3% of patients had at least signs of one reported neurological event, which was the initial or sole manifestation in 5.7% and 0.6%, respectively. 77.5% of patients with neurological manifestations had at least signs of one cerebrovascular accident, with lacunar strokes being the most common and 35.9% of them having multiple stroke episodes. There is a remarkable predilection for the brain stem and deep gray matter, with 37.3% and 41.6% of ischemic strokes, respectively. Other neurological involvement included neuropathies, focal neurological deficits, ophthalmological findings, convulsions, and headaches. In summary, neurological manifestations affect a significant proportion of patients with DADA2, and the phenotype is broad. Neurological manifestations can be the first and single manifestation of DADA2. Therefore, stroke, encephalitis, posterior reversible encephalopathy syndrome, mononeuropathy and polyneuropathy, and Behçet's disease-like presentations should prompt the neurologist to exclude DADA2, especially but not only in childhood.
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Affiliation(s)
- Mariia Dzhus
- Department of Microbiology, Immunology and Transplantation, Inborn Errors of Immunity, KU Leuven, Leuven, Belgium
| | - Lisa Ehlers
- Department of Microbiology, Immunology and Transplantation, Inborn Errors of Immunity, KU Leuven, Leuven, Belgium
| | - Marjon Wouters
- Department of Microbiology, Immunology and Transplantation, Inborn Errors of Immunity, KU Leuven, Leuven, Belgium
| | - Katrien Jansen
- Department of Development and Regeneration, Department of Pediatrics, University Hospitals Leuven and KU Leuven, Leuven, Belgium
| | - Rik Schrijvers
- Department of General Internal Medicine-Allergy and Clinical Immunology, Allergy and Clinical Immunology Research Group, Department of Microbiology, Immunology and Transplantation, University Hospitals Leuven and KU Leuven, Leuven, Belgium
| | - Lien De Somer
- Department of Pediatric Rheumatology, Laboratory of Immunobiology, Rega Institute, European Reference Network for Rare Immunodeficiency, Autoinflammatory and Autoimmune Diseases, University Hospital Leuven and KU Leuven, Leuven, Belgium
| | - Steven Vanderschueren
- Department of General Internal Medicine, European Reference Network for Rare Immunodeficiency, Autoinflammatory and Autoimmune Diseases, Department of Microbiology, Immunology and Transplantation, University Hospitals Leuven and KU Leuven, Leuven, Belgium
| | - Marco Baggio
- Department of Microbiology, Immunology and Transplantation, Inborn Errors of Immunity, KU Leuven, Leuven, Belgium
| | - Leen Moens
- Department of Microbiology, Immunology and Transplantation, Inborn Errors of Immunity, KU Leuven, Leuven, Belgium
| | | | - Rik Lories
- Department of Development and Regeneration, Skeletal Biology and Engineering Research Centre, Division of Rheumatology, University Hospitals Leuven and KU Leuven, Leuven, Belgium
| | - Giorgia Bucciol
- Department of Microbiology, Immunology and Transplantation, Inborn Errors of Immunity, Department of Pediatrics, University Hospitals Leuven and KU Leuven, Leuven, Belgium
| | - Isabelle Meyts
- Department of Microbiology, Immunology and Transplantation, Inborn Errors of Immunity, Department of Pediatrics, European Reference Network for Rare Immunodeficiency, Autoinflammatory and Autoimmune Diseases, University Hospitals Leuven and KU Leuven, Leuven, Belgium.
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Drago E, Garbarino F, Signa S, Grossi A, Schena F, Penco F, Santori E, Candotti F, Boztug K, Volpi S, Gattorno M, Caorsi R. Case Report: Susceptibility to viral infections and secondary hemophagocytic lymphohistiocytosis responsive to intravenous immunoglobulin as primary manifestations of adenosine deaminase 2 deficiency. Front Immunol 2022; 13:937108. [PMID: 36159847 PMCID: PMC9503826 DOI: 10.3389/fimmu.2022.937108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 08/15/2022] [Indexed: 12/03/2022] Open
Abstract
Deficiency of adenosine deaminase 2 (DADA2) is an autosomal recessive disease associated with a highly variable clinical presentation, including systemic vasculitis, immunodeficiency, and cytopenia. We report a case of a 16-year-old girl affected by recurrent viral infections [including cytomegalovirus (CMV)-related hepatitis and measles vaccine virus-associated manifestations] and persistent inflammation, which occurred after Parvovirus infection and complicated by secondary hemophagocytic lymphohistiocytosis (HLH). HLH’s first episode presented at 6 years of age and was preceded by persistent fever and arthralgia with evidence of Parvovirus B19 infection. The episode responded to intravenous steroids but relapsed during steroids tapering. High-dose intravenous immunoglobulin (IVIG) helped manage her clinical symptoms and systemic inflammation. The frequency of IVIG administration and the dosage were progressively reduced. At the age of 9, she experienced varicella zoster virus (VZV) reactivation followed by the recurrence of the inflammatory phenotype complicated by HLH with neurological involvement. Again, high-dose steroids and monthly IVIG resulted in a quick response. Targeted next-generation sequencing (NGS) for autoinflammatory diseases and immunodeficiencies revealed the homozygous Leu183Pro ADA2 mutation, which was confirmed by Sanger analysis. ADA2 enzymatic test showed a complete loss of ADA2 activity. For about 3 years, IVIG alone was completely effective in preventing flares of inflammation and neurological manifestations. Anti-TNF treatment was started at the age of 13 for the appearance of recurrent genital ulcers, with a complete response. This case further expands the clinical spectrum of DADA2 and emphasizes the importance of extensive genetic testing in clinical phenotypes characterized by persistent unspecific inflammatory syndromes. The use of high doses of IVIG might represent a possible effective immune modulator, especially in combination with anti-TNF treatment.
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Affiliation(s)
- Enrico Drago
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DINOGMI), University of Genoa, Genova, Italy
| | - Francesca Garbarino
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DINOGMI), University of Genoa, Genova, Italy
| | - Sara Signa
- Center for Autoinflammatory Diseases and Immunodeficiencies, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Giannina Gaslini, Genova, Italy
| | - Alice Grossi
- Unità Operativa Semplice Dipartimentale (UOSD) Laboratory of Genetics and Genomics of Rare Diseases, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Giannina Gaslini, Genova, Italy
| | - Francesca Schena
- Center for Autoinflammatory Diseases and Immunodeficiencies, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Giannina Gaslini, Genova, Italy
| | - Federica Penco
- Center for Autoinflammatory Diseases and Immunodeficiencies, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Giannina Gaslini, Genova, Italy
| | - Elettra Santori
- Division of Immunology and Allergy, Centre Hospitalier Universitaire Vaudois CHUV, Lausanne, Switzerland
| | - Fabio Candotti
- Division of Immunology and Allergy, Centre Hospitalier Universitaire Vaudois CHUV, Lausanne, Switzerland
| | - Kaan Boztug
- Ludwig Boltzmann Institute for Rare and Undiagnosed Diseases, Vienna, Austria
- St. Anna Children’s Cancer Research Institute, Vienna, Austria
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
- Medical University of Vienna, Department of Pediatrics and Adolescent Medicine, Vienna, Austria
- St. Anna Children’s Hospital, Vienna, Austria
| | - Stefano Volpi
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DINOGMI), University of Genoa, Genova, Italy
- Center for Autoinflammatory Diseases and Immunodeficiencies, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Giannina Gaslini, Genova, Italy
| | - Marco Gattorno
- Center for Autoinflammatory Diseases and Immunodeficiencies, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Giannina Gaslini, Genova, Italy
| | - Roberta Caorsi
- Center for Autoinflammatory Diseases and Immunodeficiencies, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Giannina Gaslini, Genova, Italy
- *Correspondence: Roberta Caorsi,
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Henrie R, Cherniawsky H, Marcon K, Zhao EJ, Marinkovic A, Pourshahnazari P, Parkin S, Chen LYC. Inflammatory diseases in hematology: a review. Am J Physiol Cell Physiol 2022; 323:C1121-C1136. [PMID: 35938681 DOI: 10.1152/ajpcell.00356.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hematopoietic cells are instrumental in generating and propagating protective inflammatory responses to infection or injury. However, excessive inflammation contributes to many diseases of the blood, bone marrow, and lymphatic system. We review three clinical categories of hematological inflammatory diseases in which recent clinical and translational advances have been made. The first category are monogenic inflammatory diseases. Genotype-driven research has revealed that previously mysterious diseases with protean manifestations are characterized by mutations which may be germline (e.g. deficiency of ADA2 or GATA2 deficiency) or somatic (e.g. VEXAS syndrome). The second category are the cytokine storm syndromes, including hemophagocytic lymphohistiocytosis and Castleman disease. Cytokine storm syndromes are characterized by excessive production of inflammatory cytokines including interleukin-6 and interferon-gamma, causing end-organ damage and high mortality. Finally, we review disorders associated with monoclonal and polyclonal hypergammaglobulinemia. The serum protein electrophoresis (SPEP) is typically ordered to screen for common diseases such as myeloma and humoral immunodeficiency. However, monoclonal and polyclonal hypergammaglobulinemia on SPEP can also provide important information in rare inflammatory diseases. For example, the autoinflammatory disease Schnitzler syndrome is notoriously difficult to diagnose. While this orphan disease has eluded precise genetic or histological characterization, the presence of a monoclonal paraprotein, typically IgM, is an obligate diagnostic criterion. Likewise, polyclonal hypergammaglobulinemia may be an important early, non-invasive diagnostic clue for patients presenting with rare neoplastic diseases such as Rosai-Dorfman disease and angioimmunoblastic T-cell lymphoma. Applying these three categories to patients with unexplained inflammatory syndromes can facilitate the diagnosis of rare and under-recognized diseases.
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Affiliation(s)
- Ryan Henrie
- Division of Hematology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Hannah Cherniawsky
- Division of Hematology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Krista Marcon
- Division of Hematopathology, Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Eric J Zhao
- Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Angelina Marinkovic
- Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Persia Pourshahnazari
- Division of Allergy and Immunology, Department of Medicine, University of British Columbia, Vancouver, BC Canada
| | - Stephen Parkin
- Division of Hematology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Luke Y C Chen
- Division of Hematology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada.,Centre for Health Education Scholarship, University of British Columbia, Vancouver, BC, Canada
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Hashem H, Dimitrova D, Meyts I. Allogeneic Hematopoietic Cell Transplantation for Patients With Deficiency of Adenosine Deaminase 2 (DADA2): Approaches, Obstacles and Special Considerations. Front Immunol 2022; 13:932385. [PMID: 35911698 PMCID: PMC9336546 DOI: 10.3389/fimmu.2022.932385] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 06/20/2022] [Indexed: 01/07/2023] Open
Abstract
Deficiency of adenosine deaminase 2 (DADA2) is an inherited autosomal recessive disease characterized by autoinflammation (recurrent fever), vasculopathy (livedo racemosa, polyarteritis nodosa, lacunar ischemic strokes, and intracranial hemorrhages, end organ vasculitis), immunodeficiency, lymphoproliferation, immune cytopenias, and bone marrow failure. Allogeneic hematopoietic cell transplantation (HCT) is curative for DADA2 as it reverses the hematological, immune and vascular phenotype of DADA2. The primary goal of HCT in DADA2, like in other non-malignant diseases, is engraftment with the establishment of normal hematopoiesis and normal immune function. Strategies in selecting a preparative regimen should take into consideration the specific vulnerabilities to endothelial dysfunction and liver toxicity in DADA2 patients. Overcoming an increased risk of graft rejection while minimizing organ toxicity, graft-versus-host disease, and infections can be particularly challenging in DADA2 patients. This review will discuss approaches to HCT in DADA2 patients including disease-specific considerations, barriers to successful engraftment, post-HCT complications, and clinical outcomes of published patients with DADA2 who have undergone HCT to date.
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Affiliation(s)
- Hasan Hashem
- Department of Pediatrics, Division of Pediatric Hematology and Oncology, Bone Marrow Transplant Unit, King Hussein Cancer Center (KHCC), Amman, Jordan
- *Correspondence: Hasan Hashem, ; Isabelle Meyts,
| | - Dimana Dimitrova
- Experimental Transplantation and Immunotherapy Branch, National Cancer Institute of the National Institutes of Health, Bethesda, MD, United States
| | - Isabelle Meyts
- Department of Pediatrics, Microbiology, Immunology, and Transplantation, The European Reference Network Rare Immunodeficiency Autoinflammatory and Autoimmune Diseases Network (ERN RITA) Core Center, University Hospitals Leuven, Katholieke Universiteit (KU) Leuven, Leuven, Belgium
- *Correspondence: Hasan Hashem, ; Isabelle Meyts,
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5
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Hashem H, Bucciol G, Ozen S, Unal S, Bozkaya IO, Akarsu N, Taskinen M, Koskenvuo M, Saarela J, Dimitrova D, Hickstein DD, Hsu AP, Holland SM, Krance R, Sasa G, Kumar AR, Müller I, de Sousa MA, Delafontaine S, Moens L, Babor F, Barzaghi F, Cicalese MP, Bredius R, van Montfrans J, Baretta V, Cesaro S, Stepensky P, Benedicte N, Moshous D, Le Guenno G, Boutboul D, Dalal J, Brooks JP, Dokmeci E, Dara J, Lucas CL, Hambleton S, Wilson K, Jolles S, Koc Y, Güngör T, Schnider C, Candotti F, Steinmann S, Schulz A, Chambers C, Hershfield M, Ombrello A, Kanakry JA, Meyts I. Hematopoietic Cell Transplantation Cures Adenosine Deaminase 2 Deficiency: Report on 30 Patients. J Clin Immunol 2021; 41:1633-1647. [PMID: 34324127 PMCID: PMC8452581 DOI: 10.1007/s10875-021-01098-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Accepted: 07/06/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE Deficiency of adenosine deaminase 2 (DADA2) is an inherited inborn error of immunity, characterized by autoinflammation (recurrent fever), vasculopathy (livedo racemosa, polyarteritis nodosa, lacunar ischemic strokes, and intracranial hemorrhages), immunodeficiency, lymphoproliferation, immune cytopenias, and bone marrow failure (BMF). Tumor necrosis factor (TNF-α) blockade is the treatment of choice for the vasculopathy, but often fails to reverse refractory cytopenia. We aimed to study the outcome of hematopoietic cell transplantation (HCT) in patients with DADA2. METHODS We conducted a retrospective study on the outcome of HCT in patients with DADA2. The primary outcome was overall survival (OS). RESULTS Thirty DADA2 patients from 12 countries received a total of 38 HCTs. The indications for HCT were BMF, immune cytopenia, malignancy, or immunodeficiency. Median age at HCT was 9 years (range: 2-28 years). The conditioning regimens for the final transplants were myeloablative (n = 20), reduced intensity (n = 8), or non-myeloablative (n = 2). Donors were HLA-matched related (n = 4), HLA-matched unrelated (n = 16), HLA-haploidentical (n = 2), or HLA-mismatched unrelated (n = 8). After a median follow-up of 2 years (range: 0.5-16 years), 2-year OS was 97%, and 2-year GvHD-free relapse-free survival was 73%. The hematological and immunological phenotypes resolved, and there were no new vascular events. Plasma ADA2 enzyme activity normalized in 16/17 patients tested. Six patients required more than one HCT. CONCLUSION HCT was an effective treatment for DADA2, successfully reversing the refractory cytopenia, as well as the vasculopathy and immunodeficiency. CLINICAL IMPLICATIONS HCT is a definitive cure for DADA2 with > 95% survival.
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Affiliation(s)
- Hasan Hashem
- Department of Pediatrics, Division of Pediatric Hematology and Oncology, Bone Marrow Transplant Unit, King Hussein Cancer Center (KHCC), P.O Box 1269, Amman, 11941, Jordan.
| | - Giorgia Bucciol
- Department of Pediatrics, ERN RITA Core Center, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium
- Department of Microbiology, Immunology and Transplantation, Laboratory for Inborn Errors of Immunity, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium
| | - Seza Ozen
- Department of Pediatric Rheumatology, Hacettepe University, Ankara, Turkey
- Hacettepe University Vasculitis Research Center, Ankara, Turkey
| | - Sule Unal
- Department of Pediatric Hematology, Research Center for Fanconi Anemia and Other Inherited Bone Marrow Failure Syndromes, Hacettepe University, Ankara, Turkey
| | - Ikbal Ok Bozkaya
- Division of Pediatric Hematology and Oncology, Bone Marrow Transplant Unit, University of Health Sciences, Ankara City Hospital, Ankara, Turkey
| | - Nurten Akarsu
- Department of Medical Genetics, Hacettepe University, Sihhiye, 06100, Ankara, Turkey
| | - Mervi Taskinen
- Division of Pediatric Hematology, Oncology and Stem Cell Transplantation, Helsinki University Hospital, Helsinki, Finland
| | - Minna Koskenvuo
- Pediatric Hematology, Oncology and Stem Cell Transplantation, Children and Adolescents, Helsinki University Hospital, Helsinki, Finland
| | - Janna Saarela
- Institute for Molecular Medicine Finland, HiLIFE, University of Helsinki, Helsinki, Finland
- Centre for Molecular Medicine Norway, University of Oslo, Oslo, Norway
| | - Dimana Dimitrova
- Experimental Transplantation and Immunotherapy Branch, National Cancer Institute of the National Institutes of Health, Bethesda, MD, USA
| | | | - Amy P Hsu
- Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, MD, USA
| | - Steven M Holland
- Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, MD, USA
| | - Robert Krance
- Cell and Gene Therapy, Baylor College of Medicine, Houston, TX, USA
| | - Ghadir Sasa
- Cell and Gene Therapy, Baylor College of Medicine, Houston, TX, USA
| | - Ashish R Kumar
- Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
- University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Ingo Müller
- Division of Pediatric Stem Cell Transplantation and Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Monica Abreu de Sousa
- Division of Pediatric Stem Cell Transplantation and Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Selket Delafontaine
- Department of Pediatrics, ERN RITA Core Center, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium
- Department of Microbiology, Immunology and Transplantation, Laboratory for Inborn Errors of Immunity, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium
| | - Leen Moens
- Department of Microbiology, Immunology and Transplantation, Laboratory for Inborn Errors of Immunity, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium
| | - Florian Babor
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Center for Child and Adolescent Health, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
| | - Federica Barzaghi
- San Raffaele Telethon Institute for Gene Therapy (TIGET), Pediatric Immunohematology and Bone Marrow Transplantation Unit, IRCCS San Raffaele Scientific Institute Milan, Milan, Italy
| | - Maria Pia Cicalese
- Pediatric Immunohematology and Bone Marrow Transplantation Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Robbert Bredius
- Department of Pediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Center, Leiden, Netherlands
| | - Joris van Montfrans
- Department of Pediatric Immunology and Infectious Diseases, Wilhelmina Children's Hospital, University Medical Centre Utrecht, Utrecht, Netherlands
| | - Valentina Baretta
- Pediatric Hematology Oncology, Department of Mother and Child, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Simone Cesaro
- Pediatric Hematology Oncology, Department of Mother and Child, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Polina Stepensky
- Department of Bone Marrow Transplantation and Cancer Immunotherapy, Hadassah University Medical Center, Jerusalem, Israel
| | - Neven Benedicte
- Pediatric Immunology, Hematology and Rheumatology Unit, Hôpital Necker-Enfants Malades, APHP, Paris, France
| | - Despina Moshous
- Pediatric Immunology, Hematology and Rheumatology Unit, Hôpital Necker-Enfants Malades, APHP, Paris, France
| | - Guillaume Le Guenno
- Department of Internal Medicine, University Hospital Estaing, CHU Clermont-Ferrand, Clermont-Ferrand, France
| | - David Boutboul
- Clinical Immunology Department, Hospital Saint Louis, Université de Paris, Paris, France
| | - Jignesh Dalal
- Rainbow Babies and Children's Hospital, Case Western Reserve University, Cleveland, OH, USA
| | - Joel P Brooks
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Elif Dokmeci
- Department of Pediatrics, University of New Mexico, Albuquerque, NM, USA
| | - Jasmeen Dara
- Department of Pediatrics, Division of Allergy, Immunology, Blood and Marrow Transplantation, University of California San Francisco, San Francisco, CA, USA
| | - Carrie L Lucas
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Sophie Hambleton
- Newcastle University Translational and Clinical Research Institute and Great North Children's Hospital, Newcastle Upon Tyne Hospitals NHS Foundation Trust, , Newcastle Upon Tyne, UK
| | - Keith Wilson
- Department of Hematology, University Hospital of Wales, Cardiff, UK
| | - Stephen Jolles
- Immunodeficiency Centre for Wales, University Hospital of Wales, Cardiff, UK
| | - Yener Koc
- Stem Cell Transplant Unit, Medicana International, Istanbul, Turkey
| | - Tayfun Güngör
- Division of Hematology/Oncology/Immunology, Gene Therapy, and Stem Cell Transplantation, University Children's Hospital Zurich - Eleonore Foundation & Children's Research Center (CRC), Steinwiesstrasse 75, CH-8032, Zurich, Switzerland
| | - Caroline Schnider
- Pediatric Immuno-Rheumatology of Western Switzerland, Department Women-Mother-Child, Lausanne University Hospital, Lausanne, Switzerland
| | - Fabio Candotti
- Division of Immunology and Allergy, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Sandra Steinmann
- Department of Pediatrics, University Medical Center Ulm, Ulm, Germany
| | - Ansgar Schulz
- Department of Pediatrics, University Medical Center Ulm, Ulm, Germany
| | - Chip Chambers
- Vanderbilt University Medical Center, Nashville, TN, USA
| | - Michael Hershfield
- Department of Medicine and Biochemistry, Duke University Medical Center, Durham, NC, USA
| | - Amanda Ombrello
- Metabolic, Cardiovascular, and Inflammatory Disease Genomics Branch, National Human Genome Research Institute (NHGRI), Bethesda, MD, USA
| | - Jennifer A Kanakry
- Experimental Transplantation and Immunotherapy Branch, National Cancer Institute of the National Institutes of Health, Bethesda, MD, USA
| | - Isabelle Meyts
- Department of Pediatrics, ERN RITA Core Center, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium.
- Department of Microbiology, Immunology and Transplantation, Laboratory for Inborn Errors of Immunity, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium.
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Abinun M, Slatter MA. Haematopoietic stem cell transplantation in paediatric rheumatic disease. Curr Opin Rheumatol 2021; 33:387-397. [PMID: 34261117 DOI: 10.1097/bor.0000000000000823] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
PURPOSE OF REVIEW A small proportion of children affected by rheumatic diseases suffer from severe, progressive disease, resistant to conventional antirheumatic therapies and to biologic agents interfering with inflammatory cytokines, costimulatory molecules expressed on immune system cells and intracellular signalling pathways. Adding to the poor prognosis is a high risk from significant morbidity and mortality associated with long-term treatment with multiple, often combined anti-inflammatory and immunosuppressive agents. Carefully selected patients from this unfortunate group may benefit from treatment with haematopoietic stem cell transplantation. RECENT FINDINGS The majority of patients with severe paediatric rheumatic and autoinflammatory diseases treated with autologous and/or allogeneic haematopoietic stem cell transplantation achieved long-term remission. However, the incidence of disease relapse and transplant related morbidity and mortality is still significant. SUMMARY Careful patient and donor selection, timing of the transplant earlier in the course of disease rather than the 'last resort' and choosing the most suitable conditioning regimen for each individual patient are the major factors favouring successful outcome. Close co-operation between the patients, their family, and involved medical teams is essential.
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Affiliation(s)
- Mario Abinun
- Department of Paediatric Immunology, Great North Children's Hospital, Newcastle upon Tyne Hospitals National Health Service Foundation Trust, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University
| | - Mary A Slatter
- Haematopoietic Stem Cell Transplantation Unit, Great North Children's Hospital, Newcastle upon Tyne Hospitals, National Health Service Foundation Trust, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK
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Another Exciting Data-HCT Successfully Cured Patients with DADA2 : A commentary on "Hematopoietic cell transplantation cures adenosine deaminase 2 deficiency: report on 30 patients" by Hashem H et al. J Clin Immunol 2021; 41:1443-1445. [PMID: 34390439 DOI: 10.1007/s10875-021-01121-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 08/05/2021] [Indexed: 10/20/2022]
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Pinto B, Deo P, Sharma S, Syal A, Sharma A. Expanding spectrum of DADA2: a review of phenotypes, genetics, pathogenesis and treatment. Clin Rheumatol 2021; 40:3883-3896. [PMID: 33791889 DOI: 10.1007/s10067-021-05711-w] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 03/16/2021] [Accepted: 03/21/2021] [Indexed: 01/02/2023]
Abstract
Deficiency of adenosine deaminase 2 (DADA2) is a monogenic disease caused by biallelic mutations in ADA2 gene (previously CECR1). The aim of this review was to describe the clinical phenotypes, genetics, pathogenesis and treatment of DADA2. ADA2 is highly expressed on myeloid cells and deficiency leads to polarisation of macrophages to an M1 inflammatory type and activation of neutrophils. The pathogenesis of immunological and haematological manifestations is less clear. The spectrum of clinical presentations varies widely from asymptomatic individual to severe vasculitis, several autoinflammatory, immunological and haematological manifestations. Initially considered a childhood disease, the first presentation is now being reported well into adulthood. Vasculitis closely resembles polyarteritis nodosa. Livedoid reticularis/racemosa like skin rash and central nervous system involvement in the form of ischemic or haemorrhagic stroke are dominant manifestations. Immunological manifestations include hypogammaglobulinemia and recurrent infections. Lymphopenia is the most common haematological manifestation; pure red cell aplasia and bone marrow failure has been reported in severe cases. The disease is extremely heterogeneous with variable severity noted in patients with the same mutation and even within family members. Tumour necrosis factor inhibitors are currently the treatment of choice for vasculitic and inflammatory manifestations and also prevent strokes. Haematopoietic stem cell transplantation is a curative option for severe haematological manifestations like pure red cell aplasia, bone marrow failure and immunodeficiency. Further research is required to understand pathogenesis and all clinical aspects of this disease to enable early diagnosis and prompt treatment. Key Points • Deficiency of adenosine deaminase 2 (DADA2) is a monogenic disease caused by biallelic mutations in ADA2 gene. • The clinical features include vasculitis resembling polyarteritis nodosa, autoinflammation, haematological manifestations and immunodeficiency. • The severity varies widely from mild to fatal even in patients within a family and with the same mutation. • The treatment of choice for inflammatory and vasculitic disease is tumour necrosis factor α blockers. Bone marrow transplant may be considered for severe haematological disease.
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Affiliation(s)
- Benzeeta Pinto
- Department of Clinical Immunology and Rheumatology, St. John's National Academy of Health Sciences, Bangalore, India
| | - Prateek Deo
- Department of Internal Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India
| | - Susmita Sharma
- Department of Obstetrics and Gynaecology, Adesh Medical College and Hospital, Mohri, Ambala, India
| | - Arshi Syal
- Government Medical College and Hospital, Sector 32, Chandigarh, India
| | - Aman Sharma
- Department of Internal Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India.
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Kendall JL, Springer JM. The Many Faces of a Monogenic Autoinflammatory Disease: Adenosine Deaminase 2 Deficiency. Curr Rheumatol Rep 2020; 22:64. [PMID: 32845415 PMCID: PMC7448703 DOI: 10.1007/s11926-020-00944-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
PURPOSE OF REVIEW We aim to describe the pathophysiology, clinical findings, diagnosis, and treatment of deficiency of adenosine deaminase 2 (DADA2). RECENT FINDINGS DADA2 is a multi-organ disease of children and less often adults, which can present with wide-ranging manifestations including strokes, medium vessel vasculitis, hematologic disease, and immunodeficiency. Diagnosis is through detection of reduced activity level of the adenosine deaminase 2 (ADA2) enzyme and/or identification of bi-allelic mutations in the ADA2 gene. Outside of high-dose glucocorticoids, conventional immunosuppression has been largely ineffective in treating this relapsing and remitting disease. Vasculitic-predominant manifestations respond extremely well to tumor necrosis factor-α inhibition. Hematopoietic stem cell transplantation can lead to normalization of enzyme activity, as well as resolution of vasculitic, hematologic, and immunologic manifestations, although treatment-related adverse effects are not uncommon. Early detection of this disease across multiple disciplines could prevent devastating clinical outcomes, especially in genetically pre-disposed populations.
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Affiliation(s)
- Jennifer Lee Kendall
- Division of Allergy, Clinical Immunology and Rheumatology, Department of Medicine University of Kansas Medical Center, 3901 Rainbow Blvd MS 2026, Kansas City, KS, 66160, USA
| | - Jason Michael Springer
- Division of Allergy, Clinical Immunology and Rheumatology, Department of Medicine University of Kansas Medical Center, 3901 Rainbow Blvd MS 2026, Kansas City, KS, 66160, USA.
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10
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Moens L, Hershfield M, Arts K, Aksentijevich I, Meyts I. Human adenosine deaminase 2 deficiency: A multi-faceted inborn error of immunity. Immunol Rev 2019; 287:62-72. [PMID: 30565235 DOI: 10.1111/imr.12722] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 09/23/2018] [Indexed: 12/15/2022]
Abstract
Human adenosine deaminase 1 deficiency was described in the 1970s to cause severe combined immunodeficiency. The residual adenosine deaminase activity in these patients was attributed to adenosine deaminase 2. Human adenosine deaminase type 2 deficiency (DADA2), due to biallelic deleterious mutations in the ADA2 gene, is the first described monogenic type of small- and medium-size vessel vasculitis. The phenotype of DADA2 also includes lymphoproliferation, cytopenia, and variable degrees of immunodeficiency. The physiological role of ADA2 is still enigmatic hence the pathophysiology of the condition is unclear. Preliminary data showed that in the absence of ADA2, macrophage differentiation is skewed to a pro-inflammatory M1 subset, which is detrimental for endothelial integrity. The inflammatory phenotype responds well to anti-TNF therapy with etanercept and that is the first-line treatment for prevention of severe vascular events including strokes. The classic immunosuppressive drugs are not successful in controlling the disease activity. However, hematopoietic stem cell transplantation (HSCT) has been shown to be a definitive cure in DADA2 patients who present with a severe cytopenia. HSCT can also cure the vascular phenotype and is the treatment modality for patients' refractory to anti-cytokine therapies. In this review, we describe what is currently known about the molecular mechanisms of DADA2. Further research on the pathophysiology of this multifaceted condition is needed to fine-tune and steer future therapeutic strategies.
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Affiliation(s)
- Leen Moens
- Department of Microbiology and Immunology, Laboratory for Childhood Immunology, KU Leuven, Leuven, Belgium
| | - Michael Hershfield
- Department of Medicine, School of Medicine, Duke University, Durham, North Carolina
| | - Katrijn Arts
- Department of Pediatrics, University Hospitals Leuven, Leuven, Belgium
| | - Ivona Aksentijevich
- Inflammatory Disease Section, National Human Genome Research Institute, Bethesda, Maryland
| | - Isabelle Meyts
- Department of Microbiology and Immunology, Laboratory for Childhood Immunology, KU Leuven, Leuven, Belgium.,Department of Pediatrics, University Hospitals Leuven, Leuven, Belgium
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Sozeri B, Ercan G, Dogan OA, Yıldız J, Demir F, Doğanay L. The same mutation in a family with adenosine deaminase 2 deficiency. Rheumatol Int 2019; 41:227-233. [PMID: 31541281 DOI: 10.1007/s00296-019-04444-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Accepted: 09/11/2019] [Indexed: 10/26/2022]
Abstract
The deficiency of adenosine deaminase 2 (DADA2) has recently been defined as a monogenetic autosomal recessive autoinflammatory disease. DADA2 is mainly characterized by high fever, livedo racemose, early-onset stroke, mild immunodeficiency and clinically polyarteritis nodosa (PAN)-like symptoms. Mutations in CECR1 (cat eye syndrome chromosome region, candidate 1) are responsible for DADA2. Livedoid racemose, lacunar infarct due to involvement in small vessel of the central nervous system, peripheral neuropathy, digital ulcers and loss of fingers are predominantly seen in the disease which could progress to end-stage organ failure and death in some patients. A wide spectrum of severity in phenotype as well as in the age of onset has been reported in the literature. This phenotypic variability is also found in our clinical practice even in patients with the same mutation. Here, we present a family diagnosed with DADA2, with the previously reported p.Gly47Arg mutation in CECR1.
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Affiliation(s)
- Betul Sozeri
- Department of Pediatric Rheumatology, Umraniye Training and Research Hospital, Health Sciences University, Elmalıkent Cad 34100, Umraniye, Istanbul, Turkey.
| | - Gozde Ercan
- Department of Pediatric Rheumatology, Umraniye Training and Research Hospital, Health Sciences University, Elmalıkent Cad 34100, Umraniye, Istanbul, Turkey
| | - Ozlem Akgun Dogan
- Department of Pediatric Genetics, Umraniye Training and Research Hospital, Health Sciences University, Istanbul, Turkey
| | - Jale Yıldız
- Genomic Laboratory (GLAB), Umraniye Training and Research Hospital, Health Sciences University, Istanbul, Turkey
| | - Ferhat Demir
- Department of Pediatric Rheumatology, Umraniye Training and Research Hospital, Health Sciences University, Elmalıkent Cad 34100, Umraniye, Istanbul, Turkey
| | - Levent Doğanay
- Genomic Laboratory (GLAB), Umraniye Training and Research Hospital, Health Sciences University, Istanbul, Turkey
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Barzaghi F, Minniti F, Mauro M, Bortoli MD, Balter R, Bonetti E, Zaccaron A, Vitale V, Omrani M, Zoccolillo M, Brigida I, Cicalese MP, Degano M, Hershfield MS, Aiuti A, Bondarenko AV, Chinello M, Cesaro S. ALPS-Like Phenotype Caused by ADA2 Deficiency Rescued by Allogeneic Hematopoietic Stem Cell Transplantation. Front Immunol 2019; 9:2767. [PMID: 30692987 PMCID: PMC6339927 DOI: 10.3389/fimmu.2018.02767] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 11/12/2018] [Indexed: 11/13/2022] Open
Abstract
Adenosine deaminase 2 (ADA2) deficiency is an auto-inflammatory disease due to mutations in cat eye syndrome chromosome region candidate 1 (CECR1) gene, currently named ADA2. The disease has a wide clinical spectrum encompassing early-onset vasculopathy (targeting skin, gut and central nervous system), recurrent fever, immunodeficiency and bone marrow dysfunction. Different therapeutic options have been proposed in literature, but only steroids and anti-cytokine monoclonal antibodies (such as tumor necrosis factor inhibitor) proved to be effective. If a suitable donor is available, hematopoietic stem cell transplantation (HSCT) could be curative. Here we describe a case of ADA2 deficiency in a 4-year-old Caucasian girl. The patient was initially classified as autoimmune neutropenia and then she evolved toward an autoimmune lymphoproliferative syndrome (ALPS)-like phenotype. The diagnosis of ALPS became uncertain due to atypical clinical features and normal FAS-induced apoptosis test. She was treated with G-CSF first and subsequently with immunosuppressive drugs without improvement. Only HSCT from a 9/10 HLA-matched unrelated donor, following myeloablative conditioning, completely solved the clinical signs related to ADA2 deficiency. Early diagnosis in cases presenting with hematological manifestations, rather than classical vasculopathy, allows the patients to promptly undergo HSCT and avoid more severe evolution. Finally, in similar cases highly suspicious for genetic disease, it is desirable to obtain molecular diagnosis before performing HSCT, since it can influence the transplant procedure. However, if HSCT has to be performed without delay for clinical indication, related donors should be excluded to avoid the risk of relapse or partial benefit due to a hereditary genetic defect.
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Affiliation(s)
- Federica Barzaghi
- Pediatric Immunohematology and Bone Marrow Transplantation Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy.,San Raffaele Telethon Institute for Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan, Italy.,Department of Systems Medicine, Tor Vergata University, >Rome, Italy
| | - Federica Minniti
- Paediatric Hematology-Oncology, Ospedale della Donna e del Bambino, Verona, Italy
| | - Margherita Mauro
- Paediatric Hematology-Oncology, Ospedale della Donna e del Bambino, Verona, Italy
| | | | - Rita Balter
- Paediatric Hematology-Oncology, Ospedale della Donna e del Bambino, Verona, Italy
| | - Elisa Bonetti
- Paediatric Hematology-Oncology, Ospedale della Donna e del Bambino, Verona, Italy
| | - Ada Zaccaron
- Paediatric Hematology-Oncology, Ospedale della Donna e del Bambino, Verona, Italy
| | - Virginia Vitale
- Paediatric Hematology-Oncology, Ospedale della Donna e del Bambino, Verona, Italy
| | - Maryam Omrani
- San Raffaele Telethon Institute for Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Matteo Zoccolillo
- San Raffaele Telethon Institute for Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan, Italy.,Department of Systems Medicine, Tor Vergata University, >Rome, Italy
| | - Immacolata Brigida
- San Raffaele Telethon Institute for Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Maria Pia Cicalese
- Pediatric Immunohematology and Bone Marrow Transplantation Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy.,San Raffaele Telethon Institute for Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Massimo Degano
- Biocrystallography Unit, Division of Immunology, Transplantation and Infectious Diseases, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Michael S Hershfield
- Department of Medicine and Biochemistry, Duke University School of Medicine, Durham, NC, United States
| | - Alessandro Aiuti
- Pediatric Immunohematology and Bone Marrow Transplantation Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy.,San Raffaele Telethon Institute for Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan, Italy.,Vita-Salute San Raffaele University, Milan, Italy
| | - Anastasiia V Bondarenko
- Department of Pediatric Infectious Diseases and Immunology, Medical Academy of Postgraduate Education, Kiev, Ukraine
| | - Matteo Chinello
- Paediatric Hematology-Oncology, Ospedale della Donna e del Bambino, Verona, Italy
| | - Simone Cesaro
- Paediatric Hematology-Oncology, Ospedale della Donna e del Bambino, Verona, Italy
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13
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Liu L, Wang W, Wang Y, Hou J, Ying W, Hui X, Zhou Q, Liu D, Yao H, Sun J, Wang X. A Chinese DADA2 patient: report of two novel mutations and successful HSCT. Immunogenetics 2019; 71:299-305. [DOI: 10.1007/s00251-018-01101-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 12/07/2018] [Indexed: 12/16/2022]
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Abstract
PURPOSE OF REVIEW Advances in sequencing techniques and systematic cohort-analysis of patients with autoinflammatory phenotypes have enabled a burst in the recognition of new autoinflammatory diseases and contributed to the description of the mechanisms involved in autoinflammation. This review focuses on new genetic and mechanistic discoveries that have broadened the definition of autoinflammatory diseases in the context of the established landscape, providing new therapeutic opportunities and avenues for further discoveries. RECENT FINDINGS Mechanistic insights of inflammatory diseases open opportunities for new targeted therapies. Advances in high-throughput screening of small-molecule inhibitors accelerate the discovery of new and more specific therapeutic options. Recent evidence establishes IL-18 as a driver of macrophage activation, emerging as a new biomarker and therapeutic target. Finally, the identification of escape of nonsense-mediated decay as the genetic mechanism resulting in a monogenic immune-dysregulatory disease, unveils a possibility for future discoveries. SUMMARY Recent mechanistic findings in autoinflammatory diseases as well as the identification of specific biomarkers and discovery of new diseases, continue to pave the way for ever more specific targeted approaches. These therapies are not only applicable to monogenic autoinflammatory syndromes but also for other diseases in which the same pathways are dysregulated.
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15
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Warts and DADA2: a Mere Coincidence? J Clin Immunol 2018; 38:836-843. [DOI: 10.1007/s10875-018-0565-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 10/22/2018] [Indexed: 12/12/2022]
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16
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Meyts I, Aksentijevich I. Deficiency of Adenosine Deaminase 2 (DADA2): Updates on the Phenotype, Genetics, Pathogenesis, and Treatment. J Clin Immunol 2018; 38:569-578. [PMID: 29951947 PMCID: PMC6061100 DOI: 10.1007/s10875-018-0525-8] [Citation(s) in RCA: 235] [Impact Index Per Article: 39.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 06/19/2018] [Indexed: 12/13/2022]
Abstract
Deficiency of ADA2 (DADA2) is the first molecularly described monogenic vasculitis syndrome. DADA2 is caused by biallelic hypomorphic mutations in the ADA2 gene that encodes the adenosine deaminase 2 (ADA2) protein. Over 60 disease-associated mutations have been identified in all domains of ADA2 affecting the catalytic activity, protein dimerization, and secretion. Vasculopathy ranging from livedo reticularis to polyarteritis nodosa (PAN) and life-threatening ischemic and/or hemorrhagic stroke dominate the clinical features of DADA2. Vasculitis and inflammation can affect many organs, explaining the intestinal, hepatological, and renal manifestations. DADA2 should be primarily considered in patients with early-onset fevers, rashes, and strokes even in the absence of positive family history. Hematological manifestations include most commonly hypogammaglobulinemia, although pure red cell aplasia (PRCA), immune thrombocytopenia, and neutropenia have been increasingly reported. Thus, DADA2 may unify a variety of syndromes previously not thought to be related. The first-line treatment consists of TNF-inhibitors and is effective in controlling inflammation and in preserving vascular integrity. Hematopoietic stem cell transplantation (HSCT) has been successful in a group of patients presenting with hematological manifestations. ADA2 is highly expressed in myeloid cells and plays a role in the differentiation of macrophages; however, its function is still largely undetermined. Deficiency of ADA2 has been linked to an imbalance in differentiation of monocytes towards proinflammatory M1 macrophages. Future research on the function of ADA2 and on the pathophysiology of DADA2 will improve our understanding of the condition and promote early diagnosis and targeted treatment.
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Affiliation(s)
- Isabelle Meyts
- Department of Pediatrics, Department of Microbiology and Immunology, University Hospitals Leuven, Leuven, Belgium.
| | - Ivona Aksentijevich
- Inflammatory Disease Section, National Human Genome Research Institute, Bethesda, USA.
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