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Kalai M, Moumni I, Ouragini H, Ben Fraj I, Mellouli F, Ouederni M, Chaouachi D, Boudriga I, Menif S. Molecular characterization of a novel homozygous deletion in β-globin cluster causing (δβ) 0-Thalassemia among Tunisian family. Ann Clin Biochem 2023; 60:81-85. [PMID: 36214153 DOI: 10.1177/00045632221134688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Indexed: 11/15/2022]
Abstract
BACKGROUND Deletions in the β-globin cluster are uncommon and cause thalassemia (thal) with hereditary persistence of fetal hemoglobin. They constitute a heterogenous group of disorders characterized by absent or reduced synthesis of adult hemoglobin (Hb A) and increased synthesis of fetal hemoglobin (Hb F). Although the clinical severity of these disorders are asymptomatic owing to the increased Hb F levels, the molecular basis is very heterogenous due to the large deletions in the β-globin cluster spanning both HBD and HBB genes. Here, we describe a Tunisian family carrying a novel deletion mutation causing (δβ)°-thalassemia. METHODS The amounts of hemoglobin fractions were measured by capillary electrophoresis of hemoglobin. Amplification and sequencing of different regions on the β-gene cluster were performed by Sanger method. RESULTS Family study and genetic analysis revealed a large deletion mutation in the β-globin cluster of 14.5 kb (NG_000,007.3:g. 58,253 to g.72837del14584) at the homozygous state in the patient and at heterozygous state at the other members of the family. This deletion removes the HBD and HBB genes. CONCLUSIONS In our knowledge, this new large deletion is described for the first time in the Tunisian population and in the world, designed Tunisian(δβ)0 in Ithanet database (IthaID: 3971). Therefore, it is important to identify the deletion leading to δβ-thalassemia carriers at the molecular level, to highlight the importance of recognizing the clinical features and implementing appropriate testing to clarify the diagnosis and manage the condition.
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Affiliation(s)
- Miniar Kalai
- Laboratory of Molecular and Cellular Hematology, 37965Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Imen Moumni
- Laboratory of Molecular and Cellular Hematology, 37965Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Houyem Ouragini
- Laboratory of Molecular and Cellular Hematology, 37965Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Ilhem Ben Fraj
- Laboratory of Molecular and Cellular Hematology, 37965Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
- Department of Pediatrics: Immuno-Hematology and Stem Cell Transplantation, Bone Marrow Transplant Center, Tunis, Tunisia
| | - Fethi Mellouli
- Laboratory of Molecular and Cellular Hematology, 37965Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
- Department of Pediatrics: Immuno-Hematology and Stem Cell Transplantation, Bone Marrow Transplant Center, Tunis, Tunisia
| | - Monia Ouederni
- Laboratory of Molecular and Cellular Hematology, 37965Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
- Department of Pediatrics: Immuno-Hematology and Stem Cell Transplantation, Bone Marrow Transplant Center, Tunis, Tunisia
| | - Dorra Chaouachi
- Laboratory of Molecular and Cellular Hematology, 37965Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Imen Boudriga
- Laboratory of Molecular and Cellular Hematology, 37965Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Samia Menif
- Laboratory of Molecular and Cellular Hematology, 37965Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
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Zitouni S, Bouatrous E, Laabidi O, Boudrigua I, Chaouachi D, Saidani N, Kraiem I, Ayachi A, Abbes S, Mourali M, Menif S, Ouragini H. Tunisian Newborn's Cord Blood: Reference Values of Complete Blood Count and Hemoglobin Fractions. Am J Perinatol 2022; 39:1241-1247. [PMID: 33374024 DOI: 10.1055/s-0040-1722199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVE This study was aimed to establish local reference values for hematological indices and hemoglobin (Hb) fractions in umbilical cord blood (UCB) for the northern population of Tunisia. STUDY DESIGN Our study included full-term newborns by vaginal deliveries. Hematological parameters were collected using an automated blood cell counter. The amounts of Hb fractions were measured by capillary electrophoresis of Hb. Statistical analysis was performed using R software. RESULTS A total of 328 cord blood samples were analyzed. Among them, 154 (male: 44.8%, female: 55.2%) were used to establish reference values. The normal reference values of complete blood count (CBC) and Hb fractions were calculated. Mean neonatal Hb was 14.75 ± 2.26 g/dL. Gestational age affects the expression of CBC values as red blood cell (RBC), Hb, hematocrit (Hct), mean corpuscular volume (MCV), white blood cell (WBC), and the Hb profile. Umbilical blood hemogram parameters and Hb profile are affected by the environment; higher in newborns from urban regions but not affected by gender ratio. CONCLUSION Reference ranges of normal CBC indices and Hb fractions have been successfully established in Tunisian neonates' UCB. Our data suggest reference values that could be useful for neonatal patients' laboratory results and clinical interpretation. KEY POINTS · Reference values for CBC and hemoglobin fractions have been established.. · Hematological reference for UCB is useful to identify hemolytic anemia cases early.. · UCB hematological values are influenced by gestational age and probably by environmental factors..
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Affiliation(s)
- Sana Zitouni
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia.,Department of Biology, Faculty of Sciences, Carthage University, Jarzouna, Tunisia
| | - Emna Bouatrous
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Ons Laabidi
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Imen Boudrigua
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Dorra Chaouachi
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Naima Saidani
- Department of Gyneco-Obstetrics, Faculty of Medicine of Tunis, University of Tunis El Manar, Hospital Habib Bougatfa, Tunis, Tunisia
| | - Imen Kraiem
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Amira Ayachi
- Department of Gyneco-Obstetrics, Faculty of Medicine of Tunis, University of Tunis El Manar, Hospital Habib Bougatfa, Tunis, Tunisia
| | - Salem Abbes
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Mechaal Mourali
- Department of Gyneco-Obstetrics, Faculty of Medicine of Tunis, University of Tunis El Manar, Hospital Habib Bougatfa, Tunis, Tunisia
| | - Samia Menif
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Houyem Ouragini
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
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Bouguerra G, Talbi K, Trabelsi N, Chaouachi D, Boudriga I, Abbès S, Menif S. Enhanced Eryptosis in Glucose-6-Phosphate Dehydrogenase Deficiency. Cell Physiol Biochem 2021; 55:761-772. [PMID: 34894207 DOI: 10.33594/000000474] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/15/2021] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND/AIMS Defects in the Glucose-6-Phosphate Dehydrogenase (G6PD) enzyme enhance cellular oxidative damage, thus impairing erythrocytes and radically shortening their lifespan. We aimed to study programmed erythrocyte cell death in G6PD-deficient patients, describe the molecular genetics basis of G6PD and investigate phenotype-genotype correlations. METHODS We explored eryptosis using the annexin V-binding assay, taken as an indicator of PS exposure at the erythrocyte surface. We assessed reactive oxygen species (ROS) production, intracellular calcium concentrations and ceramide formation at the cell surface. Prior to and following treatments, cells were analyzed by flow cytometry. Finally, we explored G6PD gene mutations through PCR-Sanger sequencing. RESULTS Before stimulation, PS-exposing erythrocytes were significantly higher in G6PD-deficient patients than in healthy volunteers. This was paralleled by a significant increase in reactive oxygen species production, suggesting that oxidative stress is the main trigger of PS exposure in G6PD-deficient erythrocytes. Five previously described mutations were detected in our patients. Two genotypes correlated with a significantly higher percentage of PS-exposing cells. CONCLUSION Our study uncovers a novel effect detected in G6PD-deficient erythrocytes which is cell membrane scrambling with PS translocation to the erythrocyte surface. Our findings shed a light on the mechanisms of premature erythrocyte clearance in G6PD deficiency.
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Affiliation(s)
- Ghada Bouguerra
- Université de Tunis El Manar, Faculté de Médecine de Tunis, Tunis, Tunisie, .,Université de Tunis El Manar, Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Tunis, Tunisie
| | - Khaoula Talbi
- Université de Tunis El Manar, Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Tunis, Tunisie.,Université de Tunis El Manar, Faculté des Sciences de Tunis, Tunis, Tunisie
| | - Nawel Trabelsi
- Université de Tunis El Manar, Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Tunis, Tunisie.,Université de Tunis El Manar, Faculté des Sciences de Tunis, Tunis, Tunisie
| | - Dorra Chaouachi
- Université de Tunis El Manar, Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Tunis, Tunisie
| | - Imen Boudriga
- Université de Tunis El Manar, Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Tunis, Tunisie
| | - Salem Abbès
- Université de Tunis El Manar, Faculté de Médecine de Tunis, Tunis, Tunisie.,Université de Tunis El Manar, Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Tunis, Tunisie
| | - Samia Menif
- Université de Tunis El Manar, Faculté de Médecine de Tunis, Tunis, Tunisie.,Université de Tunis El Manar, Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Tunis, Tunisie
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Trabelsi N, Bouguerra G, Haddad F, Ouederni M, Darragi I, Boudrigua I, Chaouachi D, Barmat M, Fouzai C, Bejaoui M, Menif S, Kraiem I, Abbes S. Biochemical, Cellular, and Proteomic Characterization of Hereditary Spherocytosis Among Tunisians. Cell Physiol Biochem 2021; 55:117-129. [PMID: 33667330 DOI: 10.33594/000000333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/02/2021] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND/AIMS Hereditary Spherocytosis (HS) is the most common erythrocyte membrane disorder causing hemolytic anemia. The wide heterogeneity of both clinical and laboratory manifestations of HS contributes to difficulties associated with the diagnosis of this disorder. Although massive data previously reported worldwide, there is yet no data on HS among the Tunisian population. Here we aim to characterize HS in Tunisian patients at biochemical and cellular levels, identify the membrane protein deficiency, and compare the accuracy of the diagnostic tests to identify the most appropriate assay for HS diagnosis. METHODS We investigated 81 patients with hemolytic anemia and 167 normal controls. The exploration of HS based on clinical and family history, physical examination, and the results of laboratory tests: blood smear, osmotic fragility test (OFT), cryohemolysis test (CT), pink test (PT), eosine-5'-maleimide (EMA) test, and erythrocyte membrane protein electrophoresis. RESULTS We identified 21 patients with HS, classified as severe (6/21;28.5%), moderate (10/21;47.6%), and mild (5/21;23.8%). The most prevalent protein deficiency was the band 3 protein detected in ten Tunisian HS patients. The EMA test showed a high specificity (97.5%) and sensitivity (94.7%) for HS diagnosis compared to the other screening tests. Interestingly, fourteen among sixteen patients presenting with homozygous sickle cells HbSS showed an increase of EMA fluorescence intensity compared to other anemic patients. CONCLUSION Our study highlights the efficiency of the EMA dye for the detection of HS whatever the nature of the involved protein deficiency. We report for the first time, the most prevalent protein deficiency among Tunisians with HS. Moreover, we found that the combination of the EMA-binding test with PT or incubated OFT improves the diagnosis sensitivity while maintaining a good specificity.
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Affiliation(s)
- Nawel Trabelsi
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie, .,Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunis, Tunisie
| | - Ghada Bouguerra
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie.,Faculté de Médecine de Tunis, Université de Tunis El Manar, Tunis, Tunisie
| | - Faten Haddad
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie.,Faculté de Médecine de Tunis, Université de Tunis El Manar, Tunis, Tunisie
| | - Monia Ouederni
- Unité d'hématologie-immunologie pédiatrique, Centre National de Transplantation de la Moelle Osseuse, Tunis, Tunisie
| | - Imen Darragi
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie
| | - Imen Boudrigua
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie
| | - Dorra Chaouachi
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie
| | - Mbarka Barmat
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie
| | - Chaker Fouzai
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie
| | - Mohamed Bejaoui
- Unité d'hématologie-immunologie pédiatrique, Centre National de Transplantation de la Moelle Osseuse, Tunis, Tunisie
| | - Samia Menif
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie
| | - Imen Kraiem
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie
| | - Salem Abbes
- Laboratoire d'Hématologie Moléculaire et Cellulaire (LR16IPT07), Institut Pasteur de Tunis, Tunis, Tunisie.,Faculté de Médecine de Tunis, Université de Tunis El Manar, Tunis, Tunisie
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Trabelsi N, Chaouch L, Haddad F, Jaouani M, Barkaoui E, Darragi I, Chaouachi D, Boudrigua I, Menif S, Abbes S. Novel mutations in Uridyl-diphosphate-glucuronosyl-transferase 1A1 (UGT1A1) gene in Tunisian patients with unconjugated hyperbilirubinemia. Eur J Med Genet 2021; 64:104139. [PMID: 33421605 DOI: 10.1016/j.ejmg.2021.104139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 10/02/2020] [Accepted: 01/03/2021] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Unconjugated hyperbilirubinemia (UCB) is a feature of Gilbert's syndrome (GS) and Crigler-Najjar's syndrome (CNS), which are two hereditary defects in bilirubin metabolism. Both syndromes are linked to mutations in the UGT1A1 gene, which cause either the decrease or the absence of the UGT1A1 enzymatic activity. Here, we investigated the molecular basis of the UGT1A1 gene in Tunisian patients presenting with unconjugated hyperbilirubinemia. METHODS Twenty-four patients with UCB were investigated. The screening protocol for hemoglobinopathies, enzymopathies, and membrane defects was executed in all patients. Afterward, the molecular analysis of the entire UGT1A1 gene was performed by DNA Sanger sequencing. Several bioinformatic tools were used to explore the effects of novel mutations. RESULTS Fifteen different UGT1A1 variations were identified, among which four are described here for the first time. In exon 5, the c.1412C > G; p.(Ala471Gly) and c.1589C > T; p.(Ser530Phe) mutations were detected in patients presenting with CNS type I and GS, respectively. In the 3'UTR region of UGT1A1, the c.*90C > T mutation was detected in 3 patients with CNS type I. In the same region, the c.*388C > T defect was found in a GS patient. A deleterious and damaging effect on the UGT1A1 protein were predicted for both exonic mutations. Furthermore, novel microRNAs were identified as targetting the mutated sequences for the 3'UTR mutations. CONCLUSION Our study provides novel data on UCB among Tunisians. Furthermore, we report four novel mutations associated with both GS and CNS. The identification of these mutations increases the spectrum of the UGT1A1 mutations and contributes to an understanding of the molecular abnormalities associated with unconjugated hyperbilirubinemia.
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Affiliation(s)
- Nawel Trabelsi
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie.
| | - Leila Chaouch
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie; Université de Sousse, Faculté de Médecine de Sousse, Tunisie
| | - Faten Haddad
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie
| | - Mouna Jaouani
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie
| | - Emna Barkaoui
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie
| | - Imen Darragi
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie
| | - Dorra Chaouachi
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie
| | - Imen Boudrigua
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie
| | - Samia Menif
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie
| | - Salem Abbes
- Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire, Tunisie
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Haddad F, Trabelsi N, Chaouch L, Darragi I, Oueslati M, Boudriga I, Chaouachi D, El-Borgi W, Hafsia R, Abbes S, Ouragini H. Homozygous Mutation on the β-Globin Polyadenylation Signal in a Tunisian Patient with β-Thalassemia Intermedia and Coinheritance of Gilbert's Syndrome. Hemoglobin 2017; 41:147-150. [PMID: 28592168 DOI: 10.1080/03630269.2017.1322610] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
We report here the clinical, hematological and molecular data in a 50-year-old patient with β-thalassemia intermedia (β-TI) caused by a homozygous β+ mutation on the β-globin gene polyadenylation (polyA) signal (AATAAA>AAAAAA). β Haplotype analysis was accomplished by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Haplotype and framework analysis showed that this mutation is associated with the [- - - - + + +] β haplotype and framework 1 (CCGCT) (FW1). This mutation was previously reported in the heterozygous state in association with the codon 9 (+TA) mutation in a β-TI patient originating from Tunisia. To the best of our knowledge, this is the first report describing this mutation in the homozygous state. The case reported here, coinherited Gilbert's syndrome, which is characterized by hyperbilirubinemia. This conclusion was reached by the investigation of the promoter region [A(TA)nTAA] motif of the UGT1A1 gene, showing the (TA)6/(TA)7 genotype.
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Affiliation(s)
- Faten Haddad
- a Laboratory of Molecular and Cellular Hematology , Pasteur Institute of Tunis-Tunis El Manar University , Tunis , Tunisia
| | - Nawel Trabelsi
- a Laboratory of Molecular and Cellular Hematology , Pasteur Institute of Tunis-Tunis El Manar University , Tunis , Tunisia
| | - Leila Chaouch
- a Laboratory of Molecular and Cellular Hematology , Pasteur Institute of Tunis-Tunis El Manar University , Tunis , Tunisia
| | - Imen Darragi
- a Laboratory of Molecular and Cellular Hematology , Pasteur Institute of Tunis-Tunis El Manar University , Tunis , Tunisia
| | - Meriem Oueslati
- b Laboratory of Biological Hematology , Aziza Othmana Hospital-Tunis El Manar University , Tunis , Tunisia
| | - Imen Boudriga
- a Laboratory of Molecular and Cellular Hematology , Pasteur Institute of Tunis-Tunis El Manar University , Tunis , Tunisia
| | - Dorra Chaouachi
- a Laboratory of Molecular and Cellular Hematology , Pasteur Institute of Tunis-Tunis El Manar University , Tunis , Tunisia
| | - Wijdene El-Borgi
- b Laboratory of Biological Hematology , Aziza Othmana Hospital-Tunis El Manar University , Tunis , Tunisia
| | - Raouf Hafsia
- b Laboratory of Biological Hematology , Aziza Othmana Hospital-Tunis El Manar University , Tunis , Tunisia
| | - Salem Abbes
- a Laboratory of Molecular and Cellular Hematology , Pasteur Institute of Tunis-Tunis El Manar University , Tunis , Tunisia
| | - Houyem Ouragini
- a Laboratory of Molecular and Cellular Hematology , Pasteur Institute of Tunis-Tunis El Manar University , Tunis , Tunisia
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Jaouani M, Manco L, Kalai M, Chaouch L, Douzi K, Silva A, Macedo S, Darragi I, Boudriga I, Chaouachi D, Fitouri Z, Van Wijk R, Ribeiro ML, Abbes S. Molecular basis of pyruvate kinase deficiency among Tunisians: description of new mutations affecting coding and noncoding regions in the PKLR gene. Int J Lab Hematol 2017; 39:223-231. [PMID: 28133914 DOI: 10.1111/ijlh.12610] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 10/26/2016] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Pyruvate kinase (PK) deficiency is one of the most common hereditary nonspherocytic hemolytic anemias worldwide with clinical manifestations ranging from mild to severe hemolysis. However, investigation of this enzymopathy is lacking in Tunisia. We report here a pioneer investigation of PK deficiency among Tunisian cases referred to our laboratory for biological analysis of unknown cause of hemolytic anemia. METHODS Two hundred and fifty-three patients with unknown cause of hemolytic anemia have been addressed to our laboratory in order to investigate for red blood cells genetic disorders. Red cell enzyme activities were measured by standard methods, and molecular analysis was performed by DNA sequencing. The interpretation of mutation effect and the molecular modeling were performed by using specific software. RESULTS Six different PKLR mutations were found (c.966-1G>T; c.965+1G>A; c.721G>T; c.1163C>A; c.1456C>T; c.1537T>A), among which four are described for the first time. Genotype-phenotype correlations for the novel missense mutations were investigated by three-dimensional structure analysis. CONCLUSION This study provides important data of PK deficiency among Tunisians. It might be followed by a large neonatal screening to determine the spectrum of PK mutations and identify potential deficient patients for an early medical follow-up.
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Affiliation(s)
- M Jaouani
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - L Manco
- Unidade de Hematlogia Molecular, Centro Hospitalar e Universitário de Coimbra (CHUC), Coimbra, Portugal.,Research Centre for Anthropology and Health (CIAS), Department of Life Sciences, Universidade de Coimbra, Coimbra, Portugal
| | - M Kalai
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - L Chaouch
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - K Douzi
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - A Silva
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
| | - S Macedo
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
| | - I Darragi
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - I Boudriga
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - D Chaouachi
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
| | - Z Fitouri
- Service de pédiatrie-urgences-consultations, Hôpital d'Enfants de Tunis, Tunis, Tunisia
| | - R Van Wijk
- Laboratory for Red Blood Cell Research, Department of Clinical Chemistry and Hematology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - M L Ribeiro
- Unidade de Hematlogia Molecular, Centro Hospitalar e Universitário de Coimbra (CHUC), Coimbra, Portugal
| | - S Abbes
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisia
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Kalai M, Dridi M, Chaouch L, Moumni I, Ouragini H, Darragi I, Boudrigua I, Chaouachi D, Mellouli F, Bejaoui M, Abbes S. The role of rs1984112_G at CD36 gene in increasing reticulocyte level among sickle cell disease patients. ACTA ACUST UNITED AC 2016; 22:178-182. [PMID: 27869039 DOI: 10.1080/10245332.2016.1253253] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AIMS AND BACKGROUND Mediators of adhesion become a potential new target for pharmacological therapy to struggle the complications of sickle cell disease (SCD). Several mechanisms for increased adherence have been postulated and the well-studied are CD36 and VLA4 which encoded by ITGA4. Herein, we sought to determine whether one polymorphism of CD36 namely: rs1984112 and three exons of ITGA4 (4, 5, and 6) are implicated in hemolytic status and clinical events among SCD Tunisian patients. MATERIAL AND METHODS This study enrolled 99 unrelated Tunisian subjects (63SS and 36Sβ). All SCD patients are children (less than 16 years old). The rs1984112 and the ITGA4's exons 4, 5, and 6 were analyzed for all subjects by PCR/sequencing. The association of each genotype found with both clinical complications and hemolytic status was performed using t-test. Clinical events studied included vaso-occlusive crisis (VOC), osteonecrosis, stroke, frequent infection, priapism, and acute syndrome. RESULTS The results show that rs1984112_G allele at CD36 gene revealed to be associated with higher levels of reticulocyte count (p < 0.01). The statistical result show a near significance of homozygous mutant GG genotype with VOC (p = 0.051). No association between rs1984112_G allele and the clinical severity of SCD were found. Mutational screening of exon 4, 5, and 6 of ITGA4 gene revealed absence of mutated variant. CONCLUSION Our results are similar to those found in Portuguese population which reported the role of rs1984112_G in increasing reticulocyte level among SCD patients. Consequently, the rs1984112_G of CD36 could be considered as a reliable biomarker for predicting patients at high risk for vascular occlusions and thus, allows earlier and more effective therapeutic management.
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Affiliation(s)
- Miniar Kalai
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Marwa Dridi
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Leila Chaouch
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Imen Moumni
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Houyem Ouragini
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Imen Darragi
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Imen Boudrigua
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Dorra Chaouachi
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Fethi Mellouli
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Mohamed Bejaoui
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
| | - Salem Abbes
- a Université de Tunis El Manar, Institut Pasteur de Tunis , Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisia
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Chaouch L, Moumni I, Ouragini H, Darragi I, Kalai M, Chaouachi D, Boudrigua I, Hafsia R, Abbes S. rs11886868 and rs4671393 of BCL11A associated with HbF level variation and modulate clinical events among sickle cell anemia patients. Hematology 2016:1-5. [PMID: 26125973 DOI: 10.1179/1607845415y.0000000026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
AIMS Fetal hemoglobin (HbF) modulates the phenotype of sickle cell anemia (SCA) by inhibiting deoxy sickle hemoglobin (HbS) polymerization. HbF genes are genetically regulated, and the level of HbF and its distribution among sickle erythrocytes is highly variable. Herein, we aimed to determine whether two functional polymorphisms of BCL11A are implicated in the variation of HbF and clinical events in SCA Tunisian patients. MATERIAL AND METHODS The studied population consisted of 148 SCA patients with SS phenotype. The group of patients was divided into two subgroups according to the threshold point of %HbF which is 15%. Genotyping of rs11886868 and rs4671393 was performed using PCR/Sequencing. To test for trait association with the candidate SNPs, genotype and allele frequencies between 'group who had %HbF < 15' and 'group who had %HbF >15' (controls) were compared using Pearson's chi-square test (compare 2, version 1.02). The association of each genotype and the combined genotype with complications was performed by logistic regression test. RESULTS Our findings showed that the majority of patients carried genotype CT of rs11886868 and genotypes AG and GG of rs4671393 present HbF level < 15%. RR = 0.08, RR = 0.176, and RR = 0.189, respectively. The results showed a significant association between the alleles T of rs11886868 and G of rs4671393 and %HbF < 15% with P = 0.016; RR = 0.39 and P = 8.9 × 10-3: RR = 0.567, respectively. Interestingly, the C allele of the rs11886868 and the A allele of the rs46713939 were associated with an ameliorated phenotype in patient's SCA. The combination of the genotypes GG and CT explains more phenotypic variance than the sum of the two BCL11A SNPs taken individually.
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Affiliation(s)
- Leila Chaouch
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Imen Moumni
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Houyem Ouragini
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Imen Darragi
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Miniar Kalai
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Dorra Chaouachi
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Imen Boudrigua
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Raouf Hafsia
- b Université de Tunis El Manar, Hopital Aziza Othmena, d'Hématologie Clinique , Tunisia
| | - Salem Abbes
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
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Chaouch L, Moumni I, Ouragini H, Darragi I, Kalai M, Chaouachi D, Boudrigua I, Hafsia R, Abbes S. rs11886868 and rs4671393 of BCL11A associated with HbF level variation and modulate clinical events among sickle cell anemia patients. ACTA ACUST UNITED AC 2016; 21:425-9. [PMID: 27077760 DOI: 10.1080/10245332.2015.1107275] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AIMS Fetal hemoglobin (HbF) modulates the phenotype of sickle cell anemia (SCA) by inhibiting deoxy sickle hemoglobin (HbS) polymerization. HbF genes are genetically regulated, and the level of HbF and its distribution among sickle erythrocytes is highly variable. Herein, we aimed to determine whether two functional polymorphisms of BCL11A are implicated in the variation of HbF and clinical events in SCA Tunisian patients. MATERIAL AND METHODS The studied population consisted of 148 SCA patients with SS phenotype. The group of patients was divided into two subgroups according to the threshold point of %HbF which is 15%. Genotyping of rs11886868 and rs4671393 was performed using PCR/Sequencing. To test for trait association with the candidate SNPs, genotype and allele frequencies between 'group who had %HbF < 15' and 'group who had %HbF >15' (controls) were compared using Pearson's chi-square test (compare 2, version 1.02). The association of each genotype and the combined genotype with complications was performed by logistic regression test. RESULTS Our findings showed that the majority of patients carried genotype CT of rs11886868 and genotypes AG and GG of rs4671393 present HbF level < 15%. RR = 0.08, RR = 0.176, and RR = 0.189, respectively. The results showed a significant association between the alleles T of rs11886868 and G of rs4671393 and %HbF < 15% with P = 0.016; RR = 0.39 and P = 8.9 × 10(-3): RR = 0.567, respectively. Interestingly, the C allele of the rs11886868 and the A allele of the rs46713939 were associated with an ameliorated phenotype in patient's SCA. The combination of the genotypes GG and CT explains more phenotypic variance than the sum of the two BCL11A SNPs taken individually.
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Affiliation(s)
- Leila Chaouch
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Imen Moumni
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Houyem Ouragini
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Imen Darragi
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Miniar Kalai
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Dorra Chaouachi
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Imen Boudrigua
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
| | - Raouf Hafsia
- b Université de Tunis El Manar, Hopital Aziza Othmena, d'Hématologie Clinique , Tunisia
| | - Salem Abbes
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunisia
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Chaouch L, Kalai1 M, Darragi I, Boudrigua I, Chaouachi D, Ammar SB, Mellouli F, Bjaoui M, Abbes S. Genetic link with cholelithiasis among pediatric SCA Tunisian patients: Examples of UGT1A1, SLCO1A2 and SLCO1B1. Hematology 2015; 21:121-5. [PMID: 26146896 DOI: 10.1179/1607845415y.0000000030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
AIMS AND BACKGROUND Hyperbilirubinemia is often observed in chronic hemolysis and results in the formation of pigment cholelithiasis that could be increased by the presence of defected enzymes involved in the bilirubin metabolism. Indeed, this is the first report that interested in the study of polymorphisms in genes encoded for enzymes involved in the bilirubin metabolism: rs 4149056 of SLCO1B1 and rs4149000 of SLCO1A2 in combination with rs8175347 and rs887829 of UGT1A1 in order to find a correlation between the polymorphisms studied and the presence of gallstones in a population of sickle cell anemia (SCA) pediatric Tunisians. MATERIAL AND METHODS Our study involved 102 unrelated Tunisian subjects. All SCA patients are children (less than 16 years old) and were characterized by hyperbilirubinemia and 52 of them have cholelithiasis. The polymorphisms of the candidate genes were analyzed for all subjects by PCR/sequencing. Genotype and allele frequencies between cases and controls were compared using Pearson's chi-square test with a significance threshold of P < 0.05 (compare 2, version 1.02). RESULTS The novelty of this report is that children carrying the combined genotype of the rs studied: (TA7TA7)/TT/TC/GA have a higher risk to develop gallstones (P = 0.0027, RR = 18.27 (20.0061-915.28)). CONCLUSION Altogether our data provide the implication of UGT1A1 and SLCO1A2 in sickle cell anemia-related cholelithiasis.
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Affiliation(s)
- Leila Chaouch
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisie
| | - Miniar Kalai1
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisie
| | - Imen Darragi
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisie
| | - Imen Boudrigua
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisie
| | - Dorra Chaouachi
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisie
| | - Slim Ben Ammar
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisie
| | - F Mellouli
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisie
| | - M Bjaoui
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisie
| | - Salem Abbes
- a Université de Tunis El Manar, Institut Pasteur de Tunis, Laboratoire d'Hématologie Moléculaire et Cellulaire , Tunis , Tunisie
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Chaouch L, Kalai M, Chaouachi D, Mallouli F, Hafsia R, Ben Ammar S, Abbes S. Gilbert syndrome acts as a risk factor of developing gallstone among β hemoglobinopathy Tunisian patients. Tunis Med 2015; 93:237-241. [PMID: 26375741] [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: 06/05/2023]
Abstract
BACKGROUND As a result of chronic hemolysis, hyperbilirubinemia is often observed, leading to the formation of pigment cholelithiasis which could be busted by the presence of uridine diphosphoglucuronosyltransferase 1A1 defects. AIM Herein, we investigated the effect of glibert mutation on the occurrence of pigment cholelithiasis in Tunisian patients with beta (β) hemoglobinopathy including sickle cell anemia and β thalassemia (minor). SUBJECTS AND METHODS Our study included 151 subjects divided in 75 SCA patients and 76 β thalassemia patients. Both groups of patients were divided into two sub-groups according to the presence or absence of cholelithiasis. The relationship between A(TA)nTAA variation of UGT1A1 gene, the serum bilirubin level and the occurrence of cholilithiasis was investigated. RESULTS Our results show a significant association between genotypes carrying variant (TA)7 and hyperbilirubinemia (p<0.05). Furthermore, we demonstrated a significant association between (TA)6/(TA)7 and (TA)7/(TA)7 genotypes with cholelithiasis among sickle cell anemia and thalassemia patients (p<0.05). CONCLUSION Altogether, our data provide evidence that genotypes (TA)6/(TA)7 and (TA)7/(TA)7 and (TA)7 variant present a risk factor of developing gallstone among β hemoglobinopathy Tunisian patients.
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Chaouch L, Kalai M, Jbara MB, Chaabene AB, Darragi I, Chaouachi D, Mallouli F, Hafsia R, Ghanem A, Abbes S. Association between rs267196 and rs267201 of BMP6 gene and osteonecrosis among Sickle Cell Aneamia patients. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2015; 159:145-9. [DOI: 10.5507/bp.2013.080] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 10/15/2013] [Indexed: 11/23/2022] Open
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Moumni I, Ben Mustapha M, Ben Mansour I, Zoraï A, Douzi K, Sassi S, Chaouachi D, Mellouli F, Bejaoui M, Abbes S. Fetal Hemoglobin in Tunisian Sickle Cell Disease Patient: Relationship with Polymorphic Sequences Cis to the β-Globin Gene. Indian J Hematol Blood Transfus 2015; 32:114-9. [PMID: 26855518 DOI: 10.1007/s12288-015-0504-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2014] [Accepted: 01/07/2015] [Indexed: 10/24/2022] Open
Abstract
Fetal hemoglobin (HbF) plays a dominant role in ameliorating morbidity and mortality of hemoglobinopathies. We evaluated the effects of polymorphic markers within the β-globin gene cluster to identify the genetic mechanics that influence HbF on Tunisian sickling patients (n = 242). Haplotype analysis was carried out by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and the framework polymorphism was established by PCR-sequencing, four independent regions of interest were identified: the 5' region of β-LCR-HS2 site, the intervening sequence II (IVSII) region of two fetal (Gγ and Aγ) genes and the 5' region of β-globin gene. The correlation of these various Haplotypes and SNPs with HbF expression and clinical data was studied. Our data showed that among the various polymorphic markers analyzed, only the sequence (AT)xN12(AT)y in LCR HS2 region was significantly associated (p < 0.05) with increased HbF levels, suggesting that the β-globin gene cluster exerts a significant effect on HbF in sickle cell patients. This study can improve understanding of the physiopathology of the disease and aid to increase our ability to predict clinical severity.
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Affiliation(s)
- Imen Moumni
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Maha Ben Mustapha
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Ikbel Ben Mansour
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Amine Zoraï
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Kaïs Douzi
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Sarah Sassi
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Dorra Chaouachi
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Fethi Mellouli
- Service d'Immuno-Hématologie pédiatrique, Centre National de Greffe de Moelle Osseuse, Tunis, Tunisia
| | - Mohamed Bejaoui
- Service d'Immuno-Hématologie pédiatrique, Centre National de Greffe de Moelle Osseuse, Tunis, Tunisia
| | - Salem Abbes
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis El Manar, Tunis, Tunisia
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Zorai A, Moumni I, Mosbahi I, Douzi K, Chaouachi D, Guemira F, Abbes S. Rare hemoglobin variants in Tunisian population. Int J Lab Hematol 2014; 37:148-54. [DOI: 10.1111/ijlh.12259] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 04/15/2014] [Indexed: 11/28/2022]
Affiliation(s)
- A. Zorai
- Laboratoire d'Hématologie Moléculaire et Cellulaire; Institut Pasteur; Tunis Tunisia
| | - I. Moumni
- Laboratoire d'Hématologie Moléculaire et Cellulaire; Institut Pasteur; Tunis Tunisia
| | - I. Mosbahi
- Laboratoire d'Hématologie Moléculaire et Cellulaire; Institut Pasteur; Tunis Tunisia
| | - K. Douzi
- Laboratoire d'Hématologie Moléculaire et Cellulaire; Institut Pasteur; Tunis Tunisia
| | - D. Chaouachi
- Laboratoire d'Hématologie Moléculaire et Cellulaire; Institut Pasteur; Tunis Tunisia
| | - F. Guemira
- Laboratoire de biologie clinique; Institut Saleh Azaiez; Tunis Tunisia
| | - S. Abbes
- Laboratoire d'Hématologie Moléculaire et Cellulaire; Institut Pasteur; Tunis Tunisia
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Chaouch L, Talbi E, Moumni I, Ben Chaabene A, Kalai M, Chaouachi D, Mallouli F, Ghanem A, Abbes S. Early complication in Sickle Cell Anemia children due to A(TA)<formula>_n</formula> TAA polymorphism at the promoter of UGT1A1 gene. Dis Markers 2013:M781724278TK288P. [PMID: 23619273 DOI: 10.3233/dma-130992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AIM: To determine the implication of the polymorphism namely A(TA)nTAA of UGT1A1 in lithogenesis for the first time in Tunisia among sickle cell anemia (SCA) children patients. MATERIAL AND METHODS: Our study was performed in 2010 and it involved 76 subjects chosen as control group characterized with normal hemoglobin status and presence of cholelithiasis and 102 SCA pediatric patients among whom 52 have cholelithiasis. We analyzed the polymorphism A(TA)_{n} TAA at the UGT1A1 promoter and the relationships between the various A(TA)_{n} TAA genotypes and alleles and bilirubin levels and occurrence of cholelithiasis. RESULTS AND DISCUSSION: The repartition of genotypes found according to serum bilirubin level shows a significant association between genotypes carried variant (TA)_{7} and hyperbilirubinemia (p< 0.05). We demonstrated the association of two genotypes with gallstones formation among SCA children patients: (TA)_{7}/(TA)_{7} and (TA)_{7}/(TA)_{8} with p=8.1 × 10^{ - 8} and p=0.01 respectively. (TA)_{7} and (TA)_{8} allele variants act as a risk factor for early gallstones formation in SCA patients with p=5.8 × 10^{ -9} and p=0.01 respectively. As for the control group only the genotype (TA)_{7}/(TA)_{7} presented a risk factor for gallstones formation. CONCLUSION: The novelty of this report is that it is the first time that a similar study was made on the Tunisian children sickle cell population and that the results show a clear association of (TA)_{7} variant in early gallstones formation in Tunisian SCA children. Interestingly our findings highlighted the association of (TA)_{8} variant as well, which was not found in previous studies.
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Affiliation(s)
- Leila Chaouch
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur de Tunis, Université de Tunis El Manar, Tunis, Tunisie
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Zorai A, Moumni I, Benmansour I, Chaouachi D, Ghanem A, Abbes S. A silent composite hemoglobinopathy characterized by gene sequencing. Arch Inst Pasteur Tunis 2011; 88:67-70. [PMID: 23461145] [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] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report the case of a 35-year-old Tunisian women with a chronic anemia non investigated for a long time. Laboratory analysis using advanced technology of DNA sequencing revealed a compound heterozygote for Hb O Arab and cd 39 beta degrees-thalassemia. It's the first time that such a genotype has been characterized by gene sequencing.
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Affiliation(s)
- A Zorai
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute of Tunis, University of Tunis
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Daoud BB, Mosbehi I, Préhu C, Chaouachi D, Hafsia R, Abbes S. Molecular characterization of erythrocyte glucose-6-phosphate dehydrogenase deficiency in Tunisia. ACTA ACUST UNITED AC 2008; 56:260-7. [PMID: 18226470 DOI: 10.1016/j.patbio.2007.08.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2007] [Accepted: 08/20/2007] [Indexed: 11/16/2022]
Abstract
Screening of G6PD deficiency was carried out on 79 unrelated subjects (32 females and 47 males), all coming from out consultation. DNA from deficient subject (11 females and 30 males) was analyzed for the presence of G6PD mutation. Known mutations were studied by the appropriate restriction enzyme digestion of fragment amplified by PCR. Where the mutation could not be identified in this way, the samples were subjected to SSCP analysis and abnormal fragments were sequenced. Through these methods, seven different mutations have been identified. Among deficient females, eight had the African variant A-(tow of them were homozygous) and three had the Mediterranean variant, one of them was homozygous and have had a haemolytic crisis after ingestion of fava beans showing at birth manifestation of neonatal jaundice. Among deficient males, four were hospitalized and transfused after a haemolytic crisis due to ingestion of fava beans. All of them have had manifestation of neonatal jaundice. Of them, one carried the Mediterranean variant and three others had the African variant A-. Among the remaining deficient males, 15 had A-variant, two had the Aurès mutation. SSCP analysis of nine mild deficient males, revealed the presence of the association of 1311 CT/93 TC in two subjects, a newly described silent mutation in the exon 12 associated with the polymorphism in the intron 11 93 TC in one subject and tow single intronic base deletion. The first is IVS V 17 (-C) found in two subjects and the second is IVS VIII 43 (-G) encountered in four subjects.
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Affiliation(s)
- B Ben Daoud
- Laboratoire d'hématologie moléculaire et cellulaire Institut Pasteur de Tunis, 13, place Pasteur, BP 74, 1002 Tunis-Le-Belvédère, Tunisia
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