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Murad H, Moassas F, Ali B, Katranji E, Mukhalalaty Y. The Spectrum of α-Thalassemia Mutations in Syrian Patients. Hemoglobin 2023; 47:245-248. [PMID: 38146675 DOI: 10.1080/03630269.2023.2296927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 12/13/2023] [Indexed: 12/27/2023]
Abstract
α-Thalassemia (α-thal) is a globally prevalent genetic disorder of hemoglobin (Hb) structure where the rate of α-globin chain synthesis is reduced or absent due to the presence of α-globin mutation(s). The aim of this study is to define the spectrum of α-globin gene mutations and evaluate their allele frequency in a group of α-thal carriers. A total of 55 individuals with possible α-thal patients were referred from the thalassemia centers in Syria. They have unexplained hypochromia and microcytosis. All patients were genetically tested for 21 common α-globin gene mutations using reverse hybridization kit. Seven different α-globin gene mutations and 13 different genotypes were detected in 55 patients. The two most frequently encountered mutations were -α3.7 deletion (47.1%) and --MED mutation (21.4%). The most commonly observed genotype was -α3.7/αα (40%), followed by --MED/αα genotype (21.8%). We determined the most common α thalassemia mutations in the Syrian patients. α-Thalassemia mutations with deletions were mostly observed in our study.
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Affiliation(s)
- Hossam Murad
- Molecular Biology and Biotechnology Department, Atomic Energy Commission of Syria, Damascus, Syria
| | - Faten Moassas
- Molecular Biology and Biotechnology Department, Atomic Energy Commission of Syria, Damascus, Syria
| | - Bouthina Ali
- Molecular Biology and Biotechnology Department, Atomic Energy Commission of Syria, Damascus, Syria
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Romdhane L, Mezzi N, Hamdi Y, El-Kamah G, Barakat A, Abdelhak S. Consanguinity and Inbreeding in Health and Disease in North African Populations. Annu Rev Genomics Hum Genet 2019; 20:155-179. [PMID: 31039041 DOI: 10.1146/annurev-genom-083118-014954] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
North Africa is defined as the geographical region separated from the rest of the continent by the Sahara and from Europe by the Mediterranean Sea. The main demographic features of North African populations are their familial structure and high rates of familial and geographic endogamy, which have a proven impact on health, particularly the occurrence of genetic diseases, with a greater effect on the frequency and spectrum of the rarest forms of autosomal recessive genetic diseases. More than 500 different genetic diseases have been reported in this region, most of which are autosomal recessive. During the last few decades, there has been great interest in the molecular investigation of large consanguineous North African families. The development of local capacities has brought a substantial improvement in the molecular characterization of these diseases, but the genetic bases of half of them remain unknown. Diseases of known molecular etiology are characterized by their genetic and mutational heterogeneity, although some founder mutations are encountered relatively frequently. Some founder mutations are specific to a single country or a specific ethnic or geographic group, and others are shared by all North African countries or worldwide. The impact of consanguinity on common multifactorial diseases is less evident.
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Affiliation(s)
- Lilia Romdhane
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, 1002 Tunis Belvédère, Tunisia; .,Department of Biology, Faculty of Sciences of Bizerte, Université Tunis Carthage, 7021 Jarzouna, Tunisia
| | - Nessrine Mezzi
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, 1002 Tunis Belvédère, Tunisia;
| | - Yosr Hamdi
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, 1002 Tunis Belvédère, Tunisia;
| | - Ghada El-Kamah
- Department of Clinical Genetics, Human Genetics and Genome Research Division, National Research Centre, Cairo 12622, Egypt
| | - Abdelhamid Barakat
- Laboratoire de Génétique Humaine et Biologie Moléculaire, Département de Recherche Scientifique, Institut Pasteur du Maroc, 20100 Casablanca, Morocco
| | - Sonia Abdelhak
- Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, 1002 Tunis Belvédère, Tunisia;
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Alpha-Thalassemia in North Morocco: Prevalence and Molecular Spectrum. BIOMED RESEARCH INTERNATIONAL 2019; 2019:2080352. [PMID: 31001551 PMCID: PMC6436373 DOI: 10.1155/2019/2080352] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 01/09/2019] [Accepted: 02/24/2019] [Indexed: 12/31/2022]
Abstract
Unlike the other hemoglobinopathies, few researches have been published concerning α-thalassemia in Morocco. The epidemiological features and the mutation spectrum of this disease are still unknown. This regional newborn screening is the first to study α-thalassemia in the north of Morocco. During the period from January 2015 to December 2016, 1658 newborns umbilical blood samples were investigated. Suspected newborns were screened for α-globin defects using Gap-PCR and Multiplex Ligation-dependent Probe Amplification technique. The prevalence of α-thalassemia, its mutation spectrum, and its allelic frequencies were described for the first time in Morocco. Six different α-globin genetic disorders were detected in 16 neonates. This screening valued the prevalence of α-thalassemia in the studied population at 0.96% and showed the wide mutation spectrum and the heterogeneous geographical distribution of the disease. A high rate of carriers was observed in Laouamra, a rural commune in Larache province. Heterogeneity of α-globin alleles in Morocco explains the high variability of α-thalassemia severity. This diversity reflects the anthropological history of the country. These results would contribute to the prevention of thalassemia in Morocco directing the design of a nationwide screening strategy and awareness campaign.
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Douzi K, Moumni I, Zorai A, Ben Mustapha M, Ben Mansour IM, Dorra C, Salem A. Two new β+ -thalassemia mutation [β -56 (G → C); HBBc. -106 G → C] and [β -83 (G → A); HBBc. -133 G → A] described among the Tunisian population. Am J Hum Biol 2015; 27:716-9. [PMID: 25754248 DOI: 10.1002/ajhb.22695] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 01/12/2015] [Accepted: 01/14/2015] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES Different thalassemia mutations have been reported in various ethnic groups and geographical regions in Tunisia. In the present study, we have investigated two rare β(+) -thalassemia mutations, that have not previously been reported in the Tunisian population [β -56 (G > C); HBBc. -106 G > C] and [β -83 (G > A); HBBc. -133 G > A]. METHODS The whole β-globin gene was directly sequenced, and haplotype analysis was conducted through a PCR/RFLP method. RESULTS Two new mutations were identified for the first time in Tunisia. They are located within the promoter region of β-globin gene at position -56 (G > C) and -83 (G > A). Linkage analysis using β-globin gene cluster haplotypes showed that these two mutations were associated with Mediterranean β-haplotype IX [- + - + + + +] and framework 2 (FW2) [CCTCT]. CONCLUSIONS The two newly described mutations lead to the β(+) -thalassemia among Tunisian patients. The haplotype analysis and framework assignment have helped to identify the chromosomal background associated with these mutations, and determine their origin and spread.
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Affiliation(s)
- Kais Douzi
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute, Tunis, Tunisia
| | - Imen Moumni
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute, Tunis, Tunisia
| | - Amine Zorai
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute, Tunis, Tunisia
| | - Maha Ben Mustapha
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute, Tunis, Tunisia
| | | | - Chaouachi Dorra
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute, Tunis, Tunisia
| | - Abbes Salem
- Laboratory of Molecular and Cellular Hematology, Pasteur Institute, 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] [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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Origa R, Paglietti ME, Sollaino MC, Desogus MF, Barella S, Loi D, Galanello R. Complexity of the alpha-globin genotypes identified with thalassemia screening in Sardinia. Blood Cells Mol Dis 2014; 52:46-9. [DOI: 10.1016/j.bcmd.2013.06.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Accepted: 06/01/2013] [Indexed: 10/26/2022]
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Silva MR, Sendin SM, Araujo ICDO, Pimentel FS, Viana MB. Alpha chain hemoglobins with electrophoretic mobility similar to that of hemoglobin S in a newborn screening program. Rev Bras Hematol Hemoter 2013; 35:109-14. [PMID: 23741188 PMCID: PMC3672120 DOI: 10.5581/1516-8484.20130031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Accepted: 11/09/2012] [Indexed: 11/30/2022] Open
Abstract
Objective To characterize alpha-chain variant hemoglobins with electric mobility similar to
that of hemoglobin S in a newborn screening program. Methods βS allele and alpha-thalassemia deletions were investigated in
14 children who had undefined hemoglobin at birth and an electrophoretic profile
similar to that of hemoglobin S when they were six months old. Gene sequencing and
restriction enzymes (DdeI, BsaJI, NlaIV, Bsu36I and TaqI) were used to identify
hemoglobins. Clinical and hematological data were obtained from children who
attended scheduled medical visits. Results The following alpha chain variants were found: seven children with hemoglobin
Hasharon [alpha2 47(CE5) Asp>His, HbA2:c.142G>C], all
associated with alpha-thalassemia, five with hemoglobin Ottawa [alpha1
15(A13) Gly>Arg, HBA1:c.46G>C], one with hemoglobin St Luke's
[alpha1 95(G2) Pro>Arg, HBA1:c.287C>G] and another one
with hemoglobin Etobicoke [alpha212 84(F5) Ser>Arg,
HBA212:c.255C>G]. Two associations with hemoglobin S were found: one
with hemoglobin Ottawa and one with hemoglobin St Luke's. The mutation underlying
hemoglobin Etobicoke was located in a hybrid α212 allele in one child.
There was no evidence of clinically relevant hemoglobins detected in this study.
Conclusion Apparently these are the first cases of hemoglobin Ottawa, St Luke's, Etobicoke
and the α212 gene described in Brazil. The hemoglobins detected in this
study may lead to false diagnosis of sickle cell trait or sickle cell disease when
only isoelectric focusing is used in neonatal screening. Additional tests are
necessary for the correct identification of hemoglobin variants.
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Hamamy HA, Al-Allawi NAS. Epidemiological profile of common haemoglobinopathies in Arab countries. J Community Genet 2012; 4:147-67. [PMID: 23224852 DOI: 10.1007/s12687-012-0127-8] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Accepted: 11/18/2012] [Indexed: 02/07/2023] Open
Abstract
Haemoglobinopathies including the thalassemias and sickle cell disease are known to be prevalent inherited disorders in most Arab countries with varying prevalence rates and molecular characterisation. β-thalassemia is encountered in polymorphic frequencies in almost all Arab countries with carrier rates of 1-11 % and a varying number of mutations. The most widespread mutation in Lebanon, Egypt, Syria, Jordan, Tunisia and Algeria is the IVS-I-110 (G>A). In the Eastern Arabian Peninsula, the Asian Indian mutations (IVS-I-5 (G>C), codons 8/9 (+G) and IVS-I (-25 bp del)) are more common. The α-thalassemias are encountered in the majority of Arab countries in frequencies ranging from 1 to 58 % with the highest frequencies reported from Gulf countries. The (-α(3.7)) mutation is the most frequent followed by the non-deletional α2 polyadenylation signal mutation (AATAAA>AATAAG) and the α2 IVS1 5-bp deletion. The rates of sickle cell trait in Arab countries range from 0.3 to 30 %, with the Benin, the Arab-Indian and the Bantu haplotypes constituting the bulk of the haplotypes, leading to two major phenotypes; a mild one associated with the Arab-Indian and a severe one with the Benin and Bantu haplotypes. Public health approaches targeting prevention of haemoglobinopathies in Arab countries include newborn screening for sickle cell disease, and premarital screening for carriers of β-thalassemia and sickle cell disease. These services are still patchy and inadequate in many Arab countries recommending the upgrade of these services with strengthening of the education and training of health care providers and raising public awareness on the feasibility of prevention and care for haemoglobinopathies.
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Affiliation(s)
- Hanan A Hamamy
- Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland,
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Silva MR, Sendin SM, Pimentel FS, Velloso-Rodrigues C, Romanha ÁJ, Viana MB. Hb Stanleyville-II [α78(EF7)Asn→Lys (α2); HbA2: c.237C>A]: incidence of 1:11,500 in a newborn screening program in Brazil. Hemoglobin 2012; 36:388-94. [PMID: 22625430 DOI: 10.3109/03630269.2012.686257] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Almost 3 million babies were tested in a newborn screening program in Minas Gerais, Brazil (1998-2008); 128 who have S-like hemoglobins (Hbs) were tested for the β(S) allele and 112 were identified through polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) or sequencing. Hb Stanleyville-II [α78(EF7)Asn→Lys (α2); HbA2: c.237C>A] was present in 96 children (85.7%), two in a homozygous state and 94 in a heterozygous state. Its estimated prevalence was 1:11,500. Hbs Hasharon [α47(CE5)Asp→His, GAC>CAC (α2)], Ottawa [α15(A13)Gly→Arg (GGT>CGT) (α2 or α1)], G-Ferrara [β57(E1)Asn→Lys (AAC>AAA or AAG)], St. Luke's [α95(G2)Pro→Arg, C CG>C GG (α1)], Maputo [β47(CD6)Asp→Tyr (GAT>TAT)] and Etobicoke [α84(F5)Ser→Arg (AG C>AG G or CGC or AGA) (α2 or α1)] were also identified. Many children with Hbs Stanleyville-II and Hasharon also co-inherited the -α(3.7) thalassemia gene. African ancestry was recognized by parents of all 31 children with Hb Stanleyville-II who were interviewed. Mean corpuscular volume (MCV) and mean corpuscular Hb (MCH) values were significantly lower in children with α-thalassemia (α-thal). We came to the conclusion that Hb Stanleyville-II is not so uncommon in Brazil and seems to have originated from the African slave trade. This study reinforces the importance of an accurate diagnosis of variants that have electrophoretic mobility similar to Hb S [β6(A3)Glu→Val, GAG>GTG] so that false diagnoses are avoided.
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Dastidar R, Gajra B, De M. Molecular and Hematological Characterization of Hemoglobin H Disease in the Bengali Population of Kolkata, India. Genet Test Mol Biomarkers 2011; 15:93-6. [DOI: 10.1089/gtmb.2010.0062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Rinini Dastidar
- Vivekananda Institute of Medical Sciences, Ramakrisna Mission Seva Pratisthan, Kolkata, India
| | - Bani Gajra
- Vivekananda Institute of Medical Sciences, Ramakrisna Mission Seva Pratisthan, Kolkata, India
| | - Madhusnata De
- Vivekananda Institute of Medical Sciences, Ramakrisna Mission Seva Pratisthan, Kolkata, India
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Giordano PC, Cnossen MH, Joosten AMS, Jansen CAM, Hakvoort TE, Bakker-Verweij M, Arkesteijn SGJ, van Delft P, Waye JS, Bouva MJ, Harteveld CL. Codon 24 (TAT>TAG) and codon 32 (ATG>AGG) (Hb Rotterdam): two novel alpha2 gene mutations associated with mild alpha-thalassemia found in the same family after newborn screening. Hemoglobin 2010; 34:354-65. [PMID: 20642333 DOI: 10.3109/03630269.2010.486341] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We report two novel alpha2-globin gene mutations found in the same Surinamese family. The proband, a newborn presenting during neonatal screening with 21.3% Hb Bart's (gamma4), proved to be a carrier of the common -alpha(3.7) deletion and a novel codon 32 (ATG>AGG) transversion that we named Hb Rotterdam. The father carried the same point mutation with borderline hemoglobin (Hb), MCV and low MCH values. The mother presented with a significant microcytic hypochromic anemia and also carried the -alpha(3.7) deletion and a second novel TAT>TAG transversion generating a stop codon at position 24. Shortly thereafter, Hb Rotterdam was again found in two unrelated adult females and in a Canadian newborn, all of African origin, suggesting that Hb Rotterdam could be a frequently occurring alpha(T) determinant in the Black population. Screening and characterization of the mutations, phenotype/genotype correlation and the issue of reporting newborn carriers of alpha-thalassemia (alpha-thal) are discussed.
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Affiliation(s)
- Piero C Giordano
- Hemoglobinopathies Laboratory, Department of Human and Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands.
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12
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Abstract
Alpha-thalassaemia is inherited as an autosomal recessive disorder characterised by a microcytic hypochromic anaemia, and a clinical phenotype varying from almost asymptomatic to a lethal haemolytic anaemia. It is probably the most common monogenic gene disorder in the world and is especially frequent in Mediterranean countries, South-East Asia, Africa, the Middle East and in the Indian subcontinent. During the last few decades the incidence of alpha thalassaemia in North-European countries and Northern America has increased because of demographic changes. Compound heterozygotes and some homozygotes have a moderate to severe form of alpha thalassaemia called HbH disease. Hb Bart's hydrops foetalis is a lethal form in which no alpha-globin is synthesized. Alpha thalassaemia most frequently results from deletion of one or both alpha genes from the chromosome and can be classified according to its genotype/phenotype correlation. The normal complement of four functional alpha-globin genes may be decreased by 1, 2, 3 or all 4 copies of the genes, explaining the clinical variation and increasing severity of the disease. All affected individuals have a variable degree of anaemia (low Hb), reduced mean corpuscular haemoglobin (MCH/pg), reduced mean corpuscular volume (MCV/fl) and a normal/slightly reduced level of HbA2. Molecular analysis is usually required to confirm the haematological observations (especially in silent alpha-thalassaemia and alpha-thalassaemia trait). The predominant features in HbH disease are anaemia with variable amounts of HbH (0.8-40%). The type of mutation influences the clinical severity of HbH disease. The distinguishing features of the haemoglobin Bart's hydrops foetalis syndrome are the presence of Hb Bart's and the total absence of HbF. The mode of transmission of alpha thalassaemia is autosomal recessive. Genetic counselling is offered to couples at risk for HbH disease or haemoglobin Bart's Hydrops Foetalis Syndrome. Carriers of alpha+- or alpha0-thalassaemia alleles generally do not need treatment. HbH patients may require intermittent transfusion therapy especially during intercurrent illness. Most pregnancies in which the foetus is known to have the haemoglobin Bart's hydrops foetalis syndrome are terminated due to the increased risk of both maternal and foetal morbidity.
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Affiliation(s)
- Cornelis L Harteveld
- 1Department of Human and Clinical Genetics, Leiden University Medical Center, Einthovenweg 20, 2333ZC Leiden, The Netherlands
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Haj Khelil A, Denden S, Leban N, Daimi H, Lakhdhar R, Lefranc G, Ben Chibani J, Perrin P. Hemoglobinopathies in North Africa: A Review. Hemoglobin 2010; 34:1-23. [DOI: 10.3109/03630260903571286] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Touhami I, Fattoum S, Bibi A, Siala H, Messaoud T, Koubaa D, Mankai R, Bartagi Z, Le Gallais D. The epidemiology of abnormal hemoglobins in Mediterranean high-level athletes. Eur J Appl Physiol 2009; 108:1075-81. [PMID: 20013288 DOI: 10.1007/s00421-009-1314-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/30/2009] [Indexed: 11/30/2022]
Abstract
The aim of this study was to determine the prevalence and nature of hemoglobin (Hb) defects in a Mediterranean high-level (HL) athlete population. Five hundred and ninety-four HL male and female athletes were recruited during the annual follow-up of the members of Tunisian national teams. Hematological data, Hb electrophoresis, and DNA analysis were assessed using conventional techniques. Sporting discipline, type of sport, and performance levels were assessed using a questionnaire. The results showed that 32 HL athletes had abnormal Hb (5.4%): beta-thalassemia (2.2%), alpha-thalassemia (0.5%), HbAS (1.5%), HbAC (0.5%), and rare Hb variants (0.7%). Of the 32 defect carriers, all but one (a alpha-thalassemia) were heterozygous. All the detected hemoglobinopathies but one (an Hb Hope) had already been reported in the country. The prevalence of Hb defect in the HL athletes was similar to that described in the general Tunisian population (P > 0.05). The percentage of Hb defect in the athletes was not dependent on gender, or performance level (P > 0.05). Within each type of sport the percentages of athletes with normal and abnormal Hb were similar (P > 0.05). The hematological data revealed the diversity of anemia, microcytosis, and hypochromia in thalassemic HL athletes. We concluded that HL athletes in Tunisia were a representative sample of the general Tunisian population regarding the prevalence and nature of benign abnormal Hb. The hematological data of the thalassemia carriers exhibited high variability and raised the question of genetic and sporting counseling, as well as biological follow-up for these carriers.
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Affiliation(s)
- Imed Touhami
- Dynamics of Cardiovascular Incoherencies, Montpellier 1 University, Montpellier, France
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15
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Yavarian M, Karimi M, Zorai A, Harteveld CL, Giordano PC. Molecular Basis of Hb H Disease in Southwest Iran. Hemoglobin 2009. [DOI: 10.1081/hem-47019] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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16
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Siala H, Ouali F, Messaoud T, Sfar R, Fattoum S. First Description in Tunisia of a Point Mutation at Codon 119 (CCT→TCT) in the α1-Globin Gene: Hb Groene Hart in Association with the − α3.7Deletion. Hemoglobin 2009; 29:263-8. [PMID: 16370486 DOI: 10.1080/03630260500308053] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Herein we describe the case of a Tunisian girl who presented with 3% Hb Bart's (gamma4) at birth. At the age of 3 years, she showed microcytosis and hypochromia in the absence of iron deficiency. The first step of molecular analysis was to test for the common Mediterranean mutations and the classical -alpha3.7 deletion was found in the heterozygous state. Since this finding could not explain the level of Hb Bart's at birth, or the hypochromia and microcytosis, all the alpha-globin genes were sequenced. This revealed a rare point mutation at codon 119 (CCT-->TCT) in the alpha1-globin gene, identified for the first time in Tunisia, and which has previously been described as an unstable hemoglobin (Hb) variant named Hb Groene Hart [alpha119(H2)Pro-->Ser (alpha1)]. Here the -alpha3.7/alpha(alpha)119(CCT-->TCT) genotype is responsible for the alpha-thalassemia (thal) trait phenotype.
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Affiliation(s)
- Hajer Siala
- Laboratoire de Biochimie Clinique, Hôpital d'Enfants, Tunis, Tunisie
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Mesbah-Amroun H, Rouabhi F, Ducrocq R, Elion J. Molecular Basis of α-Thalassemia in Algeria. Hemoglobin 2009; 32:273-8. [DOI: 10.1080/03630260802004301] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Moumni I, Zorai A, Daoued BB, Mosbahi I, Omar S, Kaabachi N, Dellagi K, Abbes S. Hb A2-Pasteur-Tunis [δ59(E3)Lys→Asn, AAG→AAC]: A New δ Chain Variant Detected by DNA Sequencing in a Tunisian Carrier of the Codon 39 (C→T) β0-Thalassemia Mutation. Hemoglobin 2009; 31:23-9. [PMID: 17365002 DOI: 10.1080/03630260601057005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
We describe a new delta-globin variant, Hb A2-Pasteur-Tunis [delta59(E3)Lys-->Asn, AAG-->AAC]. This hemoglobin (Hb) displayed an electrophoretic mobility faster than normal Hb A2 and was expressed at 2.2 %. The molecular defect was characterized by DNA sequencing and confirmed by a polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP)-designed protocol. Hb A2-Pasteur-Tunis was found in a carrier of a codon 39 (C-->T) beta0-thalassemia (thal), presenting with a normal Hb A2 level. Phenotype and genotype investigations revealed that the total Hb A2 level of the patient was that expected for a minor beta-thal (4.8%).
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Affiliation(s)
- Imen Moumni
- Laboratoire d'Hématologie Moléculaire et Cellulaire, Institut Pasteur, Tunis, Tunisia
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Giordano PC, Bakker-Verwij M, Harteveld CL. Frequency of α-Globin Gene Triplications and Their Interaction with β-Thalassemia Mutations. Hemoglobin 2009; 33:124-31. [DOI: 10.1080/03630260902827684] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Akram AH, Khalida AS, Sawsan S, Charles LC. Birth MCV and MCH are Quite Reliable Parameters for the Prediction of Alpha Thalassemia Trait. Gulf J Oncolog 2009. [DOI: 10.4137/cmbd.s1927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
To assess some simple blood parameters at birth that can be used as a basis to suspect α-thalassemia minor (ATM), a prospective study involving 202 consecutive neonates with MCV of less than 95 fl or less were checked for Hb Barts by HPLC. The group was divided into two, one with an MCV of 90-95 (89 cases) and the other with an MCV below 90 (113 cases). For control, 104 consecutive neonates with an MCV ≥ 95 fl were similarly checked. It has been confirmed that an MCV that is below 90 fl, especially with and MCH of ≤30 pg is a strong indicator of the presence of ATM (109/113). On the other hand, MCV of 90 or more, especially with an MCH of 30 or more is a strong negative indicator for ATM (70/89). Firm diagnosis of ATM at birth can thus be secured in majority of neonates.
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Affiliation(s)
- Al-Hilali Akram
- Pathology Department, King Fahd Armed Forces Hospital, Jeddah, Saudi Arabia
- Dubai Health Authority, Dubai, UAE
| | - Abu Saud Khalida
- Pathology Department, King Fahd Armed Forces Hospital, Jeddah, Saudi Arabia
| | - Sofi Sawsan
- Pathology Department, King Fahd Armed Forces Hospital, Jeddah, Saudi Arabia
| | - La Cock Charles
- Pathology Department, King Fahd Armed Forces Hospital, Jeddah, Saudi Arabia
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Siala H, Ouali F, Messaoud T, Bibi A, Fattoum S. α-Thalassaemia in Tunisia: some epidemiological and molecular data. J Genet 2008; 87:229-34. [PMID: 19147907 DOI: 10.1007/s12041-008-0036-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- H Siala
- Service de Biochimie Clinique, Hôpital d'Enfants de Tunis, Bab Saadoun 1007 Tunis, Tunisie.
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Giordano PC, Zweegman S, Akkermans N, Arkesteijn SGJ, van Delft P, Versteegh FGA, Wajcman H, Harteveld CL. The first case of Hb Groene Hart [alpha119(H2)Pro-->Ser, CCT-->TCT (alpha1)] homozygosity confirms that a thalassemia phenotype is associated with this abnormal hemoglobin variant. Hemoglobin 2007; 31:179-82. [PMID: 17486500 DOI: 10.1080/03630260701289490] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Hb Groene Hart [alpha119(H2)Pro-->Ser, CCT-->TCT (alpha1)] has been reported in heterozygotes of Moroccan origin and also in association with the common -alpha(3.7) deletion. In all cases, the mutated protein was not detectable but was apparently associated with a mild alpha-thalassemia (thal) phenotype, presumably due to a modification of the alpha-globin chain domain that is recognized by the a hemoglobin stabilizing protein (AHSP). The present case of Hb Groene Hart homozygosity, confirms that the alpha-thal phenotype is associated with this alpha-globin chain. Hb Groene Hart must be quite frequent not only in Morocco but probably also among the northern African coastal population.
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Affiliation(s)
- Piero C Giordano
- The Hemoglobinopathies Laboratory, Department of Human and Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands.
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Harteveld CL, Yavarian M, Zorai A, Quakkelaar ED, van Delft P, Giordano PC. Molecular spectrum of alpha-thalassemia in the Iranian population of Hormozgan: three novel point mutation defects. Am J Hematol 2003; 74:99-103. [PMID: 14508795 DOI: 10.1002/ajh.10385] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We describe the molecular spectrum of alpha-thalassemia mutations in a population sample of newborns in the South-Iranian province of Hormozgan. Out of 660 randomly collected blood samples 218 (33%) had visibly elevated Hb Bart's. DNA was extracted from 78 samples out of this selection (n=156), of which 114 alleles were found to carry an alpha-thalassemia defect. Besides the common -alpha3.7 (79.1%), -alpha4.2 (1.7%), and alpha-5nt alpha alleles (4.3%), three novel nondeletional alpha-thalassemia mutations were found; the alpha2 cd19 (-G) frameshift mutation (12.2%), the alpha1 IVS1-148(A-->G) (0.9%) affecting the splice acceptor site consensus sequence and the cd14 (TGG-->TAG) (0.9%), which creates a premature stop codon in the first exon of the alpha1-gene. A fourth mutation in the alpha1-gene, the IVS1-38 (C-->T) (0.9%) of undetermined effect, was found in an individual heterozygous for the alpha2 cd19(-G) mutation.
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Affiliation(s)
- C L Harteveld
- Hemoglobinopathies Laboratory, Human and Clinical Genetics, Leiden University Medical Centre, The Netherlands.
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Zorai A, Abbes S, Préhu C, Omar S, Gerard N, Hafsia R, Asma B, Guemira F, Dellagi K. Hb H disease among Tunisians: molecular characterization of alpha-thalassemia determinants and hematological findings. Hemoglobin 2003; 27:57-61. [PMID: 12603097 DOI: 10.1081/hem-120018439] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Amine Zorai
- Hemoglobin Group, Laboratory of Hematology, Pasteur Institute, Tunis, Tunisia
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