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Phenotypic and Molecular Genetic Analysis of Pyruvate Kinase Deficiency in a Tunisian Family
The Egyptian Journal of Medical Human Genetics (2016) 17, 265–270 HOSTED BY Ain Shams University The Egyptian Journal of Medical Human Genetics www.ejmhg.eg.net www.sciencedirect.com ORIGINAL ARTICLE Phenotypic and molecular genetic analysis of Pyruvate Kinase deficiency in a Tunisian family Jaouani Mouna a,1,*, Hamdi Nadia a,1, Chaouch Leila a, Kalai Miniar a, Mellouli Fethi b, Darragi Imen a, Boudriga Imen a, Chaouachi Dorra a, Bejaoui Mohamed b, Abbes Salem a a Laboratory of Molecular and Cellular Hematology, Pasteur Institute, Tunis, Tunisia b Service d’Immuno-He´matologie Pe´diatrique, Centre National de Greffe de Moelle Osseuse, Tunis, Tunisia Received 9 July 2015; accepted 6 September 2015 Available online 26 September 2015 KEYWORDS Abstract Pyruvate Kinase (PK) deficiency is the most frequent red cell enzymatic defect responsi- Pyruvate Kinase deficiency; ble for hereditary non-spherocytic hemolytic anemia. The disease has been studied in several ethnic Phenotypic and molecular groups. However, it is yet an unknown pathology in Tunisia. We report here, the phenotypic and investigation; molecular investigation of PK deficiency in a Tunisian family. Hemolytic anemia; This study was carried out on two Tunisian brothers and members of their family. Hematolog- Hydrops fetalis; ical, biochemical analysis and erythrocyte PK activity were performed. The molecular characteriza- PKLR mutation tion was carried out by gene sequencing technique. The first patient died few hours after birth by hydrops fetalis, the second one presented with neonatal jaundice and severe anemia necessitating urgent blood transfusion. This severe clinical pic- ture is the result of a homozygous mutation of PKLR gene at exon 8 (c.1079G>A; p.Cys360Tyr). -
Hb S/Beta-Thalassemia
rev bras hematol hemoter. 2 0 1 5;3 7(3):150–152 Revista Brasileira de Hematologia e Hemoterapia Brazilian Journal of Hematology and Hemotherapy www.rbhh.org Scientific Comment ଝ The compound state: Hb S/beta-thalassemia ∗ Maria Stella Figueiredo Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil Sickle cell disease (SCD) results from a single amino acid small increase in Hb concentration and in packed cell volume. substitution in the gene encoding the -globin subunit However, these effects are not accompanied by any reduction  ( 6Glu > Val) that produces the abnormal hemoglobin (Hb) in vaso-occlusive events, probably due to the great number of named Hb S. SCD has different genotypes with substantial Hb S-containing red blood cells resulting in increased blood 1,2 4,5 variations in presentation and clinical course (Table 1). The viscosity. combination of the sickle cell mutation and beta-thalassemia A confusing diagnostic problem is the differentiation 0  (-Thal) mutation gives rise to a compound heterozygous con- of Hb S/ -Thal from sickle cell anemia associated with ␣ dition known as Hb S/ thalassemia (Hb S/-Thal), which was -thalassemia. Table 2 shows that hematologic and elec- 3 first described in 1944 by Silvestroni and Bianco. trophoretic studies are unable to distinguish between the two The polymerization of deoxygenated Hb S (sickling) is the conditions and so family studies and DNA analysis are needed 5 primary event in the molecular pathogenesis of SCD. How- to confirm the diagnosis. +  ever, this event is highly dependent on the intracellular Hb In Hb S/ -Thal, variable amounts of Hb A dilute Hb S and composition; in other words, it is dependent on the concen- consequently inhibit polymerization-induced cellular dam- tration of Hb S, and type and concentration of the other types age. -
Non-Transfusion-Dependent Thalassemias
REVIEW ARTICLES Non-transfusion-dependent thalassemias Khaled M. Musallam, 1 Stefano Rivella, 2 Elliott Vichinsky, 3 and Eliezer A. Rachmilewitz, 4 1Department of Medicine and Medical Specialties, IRCCS Ca’ Granda Foundation Maggiore Policlinico Hospital, University of Milan, Milan, Italy; 2Department of Pediatrics, Division of Hematology/Oncology, Weill Medical College of Cornell University, New York, NY, USA; 3Department of Hematology and Oncology, Children’s Hospital and Research Center Oakland, Oakland, CA, USA; and 4Department of Hematology, Wolfson Medical Center, Holon, Israel ABSTRACT Non-transfusion-dependent thalassemias include a variety of phenotypes that, unlike patients with beta ( β)-tha - lassemia major, do not require regular transfusion therapy for survival. The most commonly investigated forms are β-thalassemia intermedia, hemoglobin E/ β-thalassemia, and α-thalassemia intermedia (hemoglobin H disease). However, transfusion-independence in such patients is not without side effects. Ineffective erythropoiesis and peripheral hemolysis, the hallmarks of disease process, lead to a variety of subsequent pathophysiologies including iron overload and hypercoagulability that ultimately lead to a number of serious clinical morbidities. Thus, prompt and accurate diagnosis of non-transfusion-dependent thalassemia is essential to ensure early intervention. Although several management options are currently available, the need to develop more novel therapeutics is jus - tified by recent advances in our understanding of the mechanisms of disease. Such efforts require wide interna - tional collaboration, especially since non-transfusion-dependent thalassemias are no longer bound to low- and middle-income countries but have spread to large multiethnic cities in Europe and the Americas due to continued migration. Introduction survival, although they may require occasional or even fre - quent transfusions in certain clinical settings and usually for Inherited hemoglobin disorders can be divided into two defined periods of time (Figure 1). -
The Variable Manifestations of Disease in Pyruvate Kinase Deficiency and Their Management
REVIEW ARTICLE The variable manifestations of disease in pyruvate kinase deficiency and their Ferrata Storti Foundation management Hanny Al-Samkari,1 Eduard J. van Beers,2 Kevin H.M. Kuo,3 Wilma Barcellini,4 Paola Bianchi,4 Andreas Glenthøj,5 María del Mar Mañú Pereira,6 Richard van Wijk,7 Bertil Glader8 and Rachael F. Grace9 1Division of Hematology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; 2Van Creveldkliniek, University Medical Centre Utrecht, University of Utrecht, Utrecht, the Netherlands; 3Division of Hematology, University of Toronto, University Health Haematologica 2020 Network, Toronto, Ontario, Canada; 4UOS Ematologia, Fisiopatologia delle Anemie, Volume 105(9):2229-2239 Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy; 5Department of Hematology, Herlev and Gentofte Hospital, Herlev, Denmark; 6Translational Research in Rare Anaemia Disorders, Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain; 7Department of Clinical Chemistry & Hematology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; 8Lucile Packard Children’s Hospital, Stanford University School of Medicine, Palo Alto, CA, USA and 9Dana/Farber Boston Children's Cancer and Blood Disorders Center, Harvard Medical School, Boston, MA, USA. ABSTRACT yruvate kinase deficiency (PKD) is the most common cause of chron- ic hereditary non-spherocytic hemolytic anemia and results in a Pbroad spectrum of disease. The diagnosis of PKD requires a high index of suspicion and judicious use of laboratory tests that may not always be informative, including pyruvate kinase enzyme assay and genetic analysis of the PKLR gene. A significant minority of patients with PKD have occult mutations in non-coding regions of PKLR which are missed on standard genetic tests. -
ATSDR Case Studies in Environmental Medicine Nitrate/Nitrite Toxicity
ATSDR Case Studies in Environmental Medicine Nitrate/Nitrite Toxicity Agency for Toxic Substances and Disease Registry Case Studies in Environmental Medicine (CSEM) Nitrate/Nitrite Toxicity Course: WB2342 CE Original Date: December 5, 2013 CE Expiration Date: December 5, 2015 Key • Nitrate toxicity is a preventable cause of Concepts methemoglobinemia. • Infants younger than 4 months of age are at particular risk of nitrate toxicity from contaminated well water. • The widespread use of nitrate fertilizers increases the risk of well-water contamination in rural areas. About This This educational case study document is one in a series of and Other self-instructional modules designed to increase the primary Case Studies care provider’s knowledge of hazardous substances in the in environment and to promote the adoption of medical Environmen- practices that aid in the evaluation and care of potentially tal Medicine exposed patients. The complete series of Case Studies in Environmental Medicine is located on the ATSDR Web site at URL: http://www.atsdr.cdc.gov/csem/csem.html In addition, the downloadable PDF version of this educational series and other environmental medicine materials provides content in an electronic, printable format. Acknowledgements We gratefully acknowledge the work of the medical writers, editors, and reviewers in producing this educational resource. Contributors to this version of the Case Study in Environmental Medicine are listed below. Please Note: Each content expert for this case study has indicated that there is no conflict of interest that would bias the case study content. CDC/ATSDR Author(s): Kim Gehle MD, MPH CDC/ATSDR Planners: Charlton Coles, Ph.D.; Kimberly Gehle, MD; Sharon L. -
Newborn Screening Result for Bart's Hemoglobin
NEWBORN SCREENING RESULT FOR BART’S HEMOGLOBIN Physician’s information sheet developed by the Nebraska Newborn Screening Program with review by James Harper, MD, Pediatric Hematologist with UNMC Follow-up program, and member of the Nebraska Newborn Screening Advisory Committee. BACKGROUND The alpha thalassemias result from the loss of alpha globin genes. There are normally four genes for alpha globin production so that the loss of one to four genes is possible. The lack of one gene causes alpha thalassemia 2 (silent carrier) with no clinically detectable problems but may cause small amounts of hemoglobin Barts to be present in newborn blood samples. Alpha thalassemia trait (Alpha thalassemia 1) results from loss of two genes and causes a mild microcytic anemia which may resemble iron deficiency anemia. The loss of three genes causes hemoglobin H diseases which is a moderately severe form of thalassemia. The lack of all four genes causes hydrops fetalis and is usually fatal in utero. In general, only the loss of one or two genes is seen in African Americans. Individuals from Southeast Asia and the Mediterranean may have all four types of alpha thalassemia. The percentage of hemoglobin Barts in the blood sample may indicate the number of alpha genes that have been lost. However, the percentage of hemoglobin Barts is not directly measurable with the current methodology used by the newborn screening laboratory. Only the presence of Barts hemoglobin in relation to fetal and adult hemoglobin, and variants S, C, D and E can be detected. RECOMMENDED WORK UP In addition to the standard newborn hemoglobinopathy confirmation (hemoglobin electrophoresis), to separate those patients with alpha thalassemia silent carrier from the patients with alpha thalassemia trait, we recommend that these babies have the following labs drawn at their 6 month well baby check: CBC with retic count, ferritin, and a hemoglobin electropheresis. -
Acoi Board Review 2019 Text
CHERYL KOVALSKI, DO FACOI NO DISCLOSURES ACOI BOARD REVIEW 2019 TEXT ANEMIA ‣ Hemoglobin <13 grams or ‣ Hematocrit<39% TEXT ANEMIA MCV RETICULOCYTE COUNT Corrected retic ct = hematocrit/45 x retic % (45 considered normal hematocrit) >2%: blood loss or hemolysis <2%: hypoproliferative process TEXT ANEMIA ‣ MICROCYTIC ‣ Obtain and interpret iron studies ‣ Serum iron ‣ Total iron binding capacity (TIBC) ‣ Transferrin saturation ‣ Ferritin-correlates with total iron stores ‣ can be normal or increased if co-existent inflammation TEXT IRON DEFICIENCY ‣ Most common nutritional problem in the world ‣ Absorbed in small bowel, enhanced by gastric acid ‣ Absorption inhibited by inflammation, phytates (bran) & tannins (tea) TEXT CAUSES OF IRON DEFICIENCY ‣ Blood loss – most common etiology ‣ Decreased intake ‣ Increased utilization-EPO therapy, chronic hemolysis ‣ Malabsorption – gastrectomy, sprue ‣ ‣ ‣ TEXT CLINICAL MANIFESTATIONS OF IRON DEFICIENCY ‣ Impaired psychomotor development ‣ Fatigue, Irritability ‣ PICA ‣ Koilonychiae, Glossitis, Angular stomatitis ‣ Dysphagia TEXT IRON DEFICIENCY LAB FINDINGS ‣ Low serum iron, increased TIBC ‣ % sat <20 TEXT MANAGEMENT OF IRON DEFICIENCY ‣ MUST LOOK FOR SOURCE OF BLEED: ie: GI, GU, Regular blood donor ‣ Replacement: 1. Oral: Ferrous sulfate 325 mg TID until serum iron, % sat, and ferritin mid-range normal, 6-12 months 2. IV TEXT SIDEROBLASTIC ANEMIAS Diverse group of disorders of RBC production characterized by: 1. Defect involving incorporation of iron into heme molecule 2. Ringed sideroblasts in -
Approach to Anemia
APPROACH TO ANEMIA Mahsa Mohebtash, MD Medstar Union Memorial Hospital Definition of Anemia • Reduced red blood mass • RBC measurements: RBC mass, Hgb, Hct or RBC count • Hgb, Hct and RBC count typically decrease in parallel except in severe microcytosis (like thalassemia) Normal Range of Hgb/Hct • NL range: many different values: • 2 SD below mean: < Hgb13.5 or Hct 41 in men and Hgb 12 or Hct of 36 in women • WHO: Hgb: <13 in men, <12 in women • Revised WHO/NCI: Hgb <14 in men, <12 in women • Scrpps-Kaiser based on race and age: based on 5th percentiles of the population in question • African-Americans: Hgb 0.5-1 lower than Caucasians Approach to Anemia • Setting: • Acute vs chronic • Isolated vs combined with leukopenia/thrombocytopenia • Pathophysiologic approach • Morphologic approach Reticulocytes • Reticulocytes life span: 3 days in bone marrow and 1 day in peripheral blood • Mature RBC life span: 110-120 days • 1% of RBCs are removed from circulation each day • Reticulocyte production index (RPI): Reticulocytes (percent) x (HCT ÷ 45) x (1 ÷ RMT): • <2 low Pathophysiologic approach • Decreased RBC production • Reduced effective production of red cells: low retic production index • Destruction of red cell precursors in marrow (ineffective erythropoiesis) • Increased RBC destruction • Blood loss Reduced RBC precursors • Low retic production index • Lack of nutrients (B12, Fe) • Bone marrow disorder => reduced RBC precursors (aplastic anemia, pure RBC aplasia, marrow infiltration) • Bone marrow suppression (drugs, chemotherapy, radiation) -
Clinical Evaluation of Different Types of Anemia 1Richa Saxena, 2Sudha Chamoli, 3Monisha Batra
WJOA Richa Saxena et al 10.5005/jp-journals-10065-0024 REVIEW ARTICLE Clinical Evaluation of Different Types of Anemia 1Richa Saxena, 2Sudha Chamoli, 3Monisha Batra World Health Organization criteria for anemia ABSTRACT Table 1: Venous blood (gm/dL) MCHC Anemia, defined as a hemoglobin level two standard devia- Adult males 13 34 tions below the mean for age, is prevalent among infants and children as well as adults worldwide. The evaluation Adult females, nonpregnant 12 34 of an individual with anemia should begin with a thorough Adult females, pregnant 11 34 history and risk assessment. Characterizing the anemia as Children (6 months–6 years) 11 34 microcytic, normocytic, or macrocytic based on the mean Children (6–14 years) 12 34 corpuscular volume (MCV) will aid in the work-up and man- agement. Microcytic anemia due to iron deficiency is the most common type of anemia in children. Iron deficiency CLASSIFICATION OF ANEMIA anemia, which can be associated with cognitive issues, is prevented and treated with iron supplements or increased The classification of anemia based on two factors (Table 2): intake of dietary iron. This review article discusses the clinical 1. Red cell morphology evaluation of different types of anemias based on the find- 2. Etiology of anemia ings of clinical examination (i.e., pallor, pedal edema, nail changes, and epithelial changes) as well as the results of Anemia Classification Based on Morphology various investigations such as routine blood investigations (hemoglobin, mean cell hemoglobin concentration [MCHC], Anemia can be classified based on morphology as: packed cell volume, etc.), peripheral smear examination, • Normocytic normochromic (MCV 76–96 fL, MCHC bone marrow examination, etc. -
Iron Deficiency and the Anemia of Chronic Disease
Thomas G. DeLoughery, MD MACP FAWM Professor of Medicine, Pathology, and Pediatrics Oregon Health Sciences University Portland, Oregon [email protected] IRON DEFICIENCY AND THE ANEMIA OF CHRONIC DISEASE SIGNIFICANCE Lack of iron and the anemia of chronic disease are the most common causes of anemia in the world. The majority of pre-menopausal women will have some element of iron deficiency. The first clue to many GI cancers and other diseases is iron loss. Finally, iron deficiency is one of the most treatable medical disorders of the elderly. IRON METABOLISM It is crucial to understand normal iron metabolism to understand iron deficiency and the anemia of chronic disease. Iron in food is largely in ferric form (Fe+++ ) which is reduced by stomach acid to the ferrous form (Fe++). In the jejunum two receptors on the mucosal cells absorb iron. The one for heme-iron (heme iron receptor) is very avid for heme-bound iron (absorbs 30-40%). The other receptor - divalent metal transporter (DMT1) - takes up inorganic iron but is less efficient (1-10%). Iron is exported from the enterocyte via ferroportin and is then delivered to the transferrin receptor (TfR) and then to plasma transferrin. Transferrin is the main transport molecule for iron. Transferrin can deliver iron to the marrow for the use in RBC production or to the liver for storage in ferritin. Transferrin binds to the TfR on the cell and iron is delivered either for use in hemoglobin synthesis or storage. Iron that is contained in hemoglobin in senescent red cells is recycled by binding to ferritin in the macrophage and is transferred to transferrin for recycling. -
Microcytic Hypochromic Anemia Patients with Thalassemia: Genotyping Approach
101 MICROCYTIC HYPOCHROMIC ANEMIA PATIENTS WITH THALASSEMIA: GENOTYPING APPROACH FAKHER RAHIM ABSTRACT BACKGROUND: Microcytic hypochromic anemia is a common condition in clinical practice, and alpha-thalassemia has to be considered as a differential diagnosis. AIMS: This study was conducted to evaluate the frequency of α-gene, β-gene and hemoglobin variant numbers in subjects with microcytic hypochromic anemia. SETTING AND DESIGNS: Population-based case-control study in the Iranian population. MATERIALS AND METHODS: A total of 340 subjects from southwest part of Iran were studied in the Research Center of Thalassemia and Hemoglobinopathies (RCTH), Iran. Genotyping for known α- and β-gene mutations was done with gap-PCR and ARMS. In cases of some rare mutations, the genotyping was done with the help of other techniques such as RFLP and ARMS-PCR. STATISTICAL ANALYSIS: Statistical analysis was carried out by SPSS 11.5 and an independent-sample t test. RESULTS: Out of the total 340 individuals, 325 individuals were evaluated to have microcytic hypochromic anemia based on initial hematological parameters such as MCV<80 fl; MCH <27 pg; the remaining 15 patients were diagnosed with no definite etiology. The overall frequency of -α3.7 deletion in 325 individuals was 20.3%. The most frequent mutations were IVS II-I, CD 36/37 and IVS I-110 with frequencies of 6.31%, 5.27% and 1.64%, respectively. Only, there was a significant difference between beta-thalassemia trait and beta-thalassemia major with regard to MCV (P < 0.05) and MCH (P < 0.05) indices, and also MCH index between beta-thalassemia trait and Hb variants (P < 0.05). -
Prevalence and Management of Iron Overload in Pyruvate Kinase Deficiency
LETTERS TO THE EDITOR Helsinki. In Lancaster, Pennsylvania, USA, in which all Prevalence and management of iron overload in enrolled patients are Amish, additional laboratory and pyruvate kinase deficiency: report from the Pyruvate radiological data were collected under a site-specific IRB- Kinase Deficiency Natural History Study approved protocol. All patients gave informed consent. The NHS enrolled 278 patients with PK deficiency from Pyruvate kinase (PK) deficiency is the most common June 2014 through April 2017 at 31 centers in 6 countries. red cell glycolytic enzyme defect causing hereditary non- A detailed description of the cohort is published else- spherocytic hemolytic anemia. Current treatments are where.2 Twenty-four patients were excluded due to the mainly supportive and include red cell transfusions and inability to confirm two pathogenic PKLR mutations. splenectomy.1 Regular red cell transfusions are known to Patients under one year old at enrollment were also result in iron overload; however, the prevalence and excluded (n=12) from this analysis, because ferritin is less spectrum of transfusion-independent iron overload in the reliably related to iron overload in this youngest age overall PK-deficient population has not been well group, leaving 242 participants reported herein. Patients defined. This analysis describes the prevalence and clini- were defined as regularly transfused if they had received cal characteristics of iron overload in patients enrolled in ≥6 transfusions in the 12 months prior to enrollment. At the PK Deficiency Natural History Study (NHS) with a enrollment, 82% (198/242) of patients were not receiving focus on those patients who are not regularly transfused.2 regular transfusions; 38% (53/138) of these patients had The PK deficiency NHS protocol (clinicaltrials.gov identi- iron overload as defined by ferritin.