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Jiang F, Ju AP, Li J, Chen GL, Zhou JY, Tang XW, Zuo LD, Li DZ. Hb Westmead (HBA2: c.369C>G): Hematological Characteristics in Heterozygotes with and without α0-Thalassemia. Hemoglobin 2020; 44:153-155. [DOI: 10.1080/03630269.2020.1768109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Fan Jiang
- Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, People’s Republic of China
| | - Ai-Ping Ju
- Clinical Laboratory, Hu Zhong Hospital, Guangzhou, Guangdong, People’s Republic of China
| | - Jian Li
- Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, People’s Republic of China
| | - Gui-Lan Chen
- Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, People’s Republic of China
| | - Jian-Ying Zhou
- Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, People’s Republic of China
| | - Xue-Wei Tang
- Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, People’s Republic of China
| | - Lian-Dong Zuo
- Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, People’s Republic of China
| | - Dong-Zhi Li
- Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, People’s Republic of China
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Horri-Naceur A, Timson DJ. In Silico Analysis of the Effects of Point Mutations on α-Globin: Implications for α-Thalassemia. Hemoglobin 2020; 44:89-103. [PMID: 32420790 DOI: 10.1080/03630269.2020.1739067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Hemoglobinopathies are inherited diseases that impair the structure and function of the oxygen-carrying pigment hemoglobin (Hb). Adult Hb consists of two α and two β subunits. α-Thalassemia (α-thal) affects the genes that code for the α-globin chains, HBA1 and HBA2. Mutations can result in asymptomatic, mild or severe outcomes depending on several factors, such as mutation type, number of mutations and the location at which they occur. PredictSNP was used to estimate whether every possible single nucleotide polymorphism (SNP) would have a neutral or deleterious effect on the protein. These results were then used to create a plot of predicted tolerance to change for each residue in the protein. Tolerance to change was negatively correlated with the residue's sequence conservation score. The PredictSNP data were compared to clinical reports of 110 selected variants in the literature. There were 29 disagreements between the two data types. Some of these could be resolved by considering the role of the affected residue in binding other molecules. The three-dimensional structures of some of these variant proteins were modeled. These models helped explain variants which affect heme binding. We predict that where a point mutation alters a residue that is intolerant to change, is well conserved and or involved in interactions, it is likely to be associated with disease. Overall, the data from this study could be used alongside biochemical and clinical data to assess novel α-globin variants.
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Affiliation(s)
- Agathe Horri-Naceur
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton, East Sussex, UK
| | - David J Timson
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton, East Sussex, UK
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Chen B, Lin L, Yi S, Chen Q, Wei H, Li G, Zheng C, He S, Qiu X. A Novel Mutation of the α2-Globin Gene Causing α +-Thalassemia: Hb Nanning (HBA2: c.369_370delinsGA). Hemoglobin 2017; 41:56-58. [PMID: 28395547 DOI: 10.1080/03630269.2017.1302950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
We report a novel mutation on the α2-globin gene, Hb Nanning (HBA2:c.369_370delinsGA) detected in a Chinese family. This mutation gives rise to a previously undescribed hemoglobin (Hb) variant that was undetectable by various separation techniques. Both carriers of the mutation have mean corpuscular volume (MCV) and mean corpuscular Hb (MCH) values that are below normal, as would be predicted for an α+-thalassemia (α+-thal) patient.
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Affiliation(s)
- Biyan Chen
- a Prenatal Diagnosis Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , People's Republic of China
| | - Li Lin
- a Prenatal Diagnosis Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , People's Republic of China
| | - Shang Yi
- a Prenatal Diagnosis Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , People's Republic of China
| | - Qiuli Chen
- a Prenatal Diagnosis Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , People's Republic of China
| | - Hongwei Wei
- a Prenatal Diagnosis Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , People's Republic of China
| | - Guojian Li
- b Research Department , Guangxi Zhuang Autonomous Region Health and Family Planning Commission , Nanning , People's Republic of China
| | - Chenguang Zheng
- a Prenatal Diagnosis Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , People's Republic of China
| | - Sheng He
- a Prenatal Diagnosis Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , People's Republic of China
| | - XiaoXia Qiu
- a Prenatal Diagnosis Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , People's Republic of China
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Théberge R, Dikler S, Heckendorf C, Chui DHK, Costello CE, McComb ME. MALDI-ISD Mass Spectrometry Analysis of Hemoglobin Variants: a Top-Down Approach to the Characterization of Hemoglobinopathies. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2015; 26:1299-310. [PMID: 26002792 PMCID: PMC4496427 DOI: 10.1007/s13361-015-1164-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Revised: 04/06/2015] [Accepted: 04/07/2015] [Indexed: 05/13/2023]
Abstract
Hemoglobinopathies are the most common inherited disorders in humans and are thus the target of screening programs worldwide. Over the past decade, mass spectrometry (MS) has gained a more important role as a clinical means to diagnose variants, and a number of approaches have been proposed for characterization. Here we investigate the use of matrix-assisted laser desorption/ionization time-of-flight MS (MALDI-TOF MS) with sequencing using in-source decay (MALDI-ISD) for the characterization of Hb variants. We explored the effect of matrix selection using super DHB or 1,5-diaminonaphthalene on ISD fragment ion yield and distribution. MALDI-ISD MS of whole blood using super DHB simultaneously provided molecular weights for the alpha and beta chains, as well as extensive fragmentation in the form of sequence defining c-, (z + 2)-, and y-ion series. We observed sequence coverage on the first 70 amino acids positions from the N- and C-termini of the alpha and beta chains in a single experiment. An abundant beta chain N-terminal fragment ion corresponding to βc34 was determined to be a diagnostic marker ion for Hb S (β6 Glu→Val, sickle cell), Hb C (β6 Glu→Lys), and potentially for Hb E (β26 Glu→Lys). The MALDI-ISD analysis of Hb S and HbSC yielded mass shifts corresponding to the variants, demonstrating the potential for high-throughput screening. Characterization of an alpha chain variant, Hb Westmead (α122 His→Gln), generated fragments that established the location of the variant. This study is the first clinical application of MALDI-ISD MS for the determination and characterization of hemoglobin variants.
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Affiliation(s)
- Roger Théberge
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, Boston, MA 02118
| | - Sergei Dikler
- Bruker Daltonics Inc., 40 Manning Road, Billerica, MA 01821
| | - Christian Heckendorf
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, Boston, MA 02118
| | - David H. K. Chui
- Department of Medicine, Boston University School of Medicine, Boston, MA 02118
| | - Catherine E. Costello
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, Boston, MA 02118
| | - Mark E. McComb
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, Boston, MA 02118
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Kimura EM, Oliveira DM, Jorge SE, Ribeiro DM, Zaccariotto TR, Santos MNN, Almeida V, Albuquerque DM, Costa FF, Sonati MDF. Investigating alpha-globin structural variants: a retrospective review of 135,000 Brazilian individuals. Rev Bras Hematol Hemoter 2015; 37:103-8. [PMID: 25818820 PMCID: PMC4382568 DOI: 10.1016/j.bjhh.2015.01.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Accepted: 09/30/2014] [Indexed: 12/04/2022] Open
Abstract
Background Brazil has a multiethnic population with a high diversity of hemoglobinopathies. While screenings for beta-globin mutations are far more common, alterations affecting alpha-globin genes are usually more silent and less well known. The aim of this study was to describe the results of a screening program for alpha-globin gene mutations in a representative sample of the Southeastern Brazilian population. Methods A total of 135,000 individuals, including patients with clinical suspicion of hemoglobinopathies and their family members, randomly chosen individuals submitted to blood tests and blood donors who were abnormal hemoglobin carriers were analyzed. The variants were screened by alkaline and acid electrophoreses, isoelectric focusing and cation-exchange high performance liquid chromatography (HPLC) and the abnormal chains were investigated by reverse-phase high performance liquid chromatography (RP-HPLC). Mutations were identified by molecular analyses, and the oxygen affinity, heme–heme cooperativity and Bohr effect of the variants were evaluated by functional tests. Results Four new and 22 rare variants were detected in 98 families. Some of these variants were found in co-inheritance with other hemoglobinopathies. Of the rare hemoglobins, Hasharon, Stanleyville II and J-Rovigo were the most common, the first two being S-like and associated with alpha-thalassemia. Conclusion The variability of alpha-globin alterations reflects the high degree of racial miscegenation and an intense internal migratory flow between different Brazilian regions. This diversity highlights the importance of programs for diagnosing hemoglobinopathies and preventing combinations that may lead to important clinical manifestations in multiethnic populations.
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Affiliation(s)
- Elza Miyuki Kimura
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil; National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil
| | - Denise Madureira Oliveira
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil; National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil
| | - Susan Elisabeth Jorge
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil; National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil
| | - Daniela Maria Ribeiro
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil; National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil
| | - Tânia Regina Zaccariotto
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil; National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil
| | - Magnun Nueldo Nunes Santos
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil; National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil
| | - Vanessa Almeida
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil; National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil
| | - Dulcinéia Martins Albuquerque
- National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil; Hematology and Hemotherapy Center, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Fernando Ferreira Costa
- National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil; Hematology and Hemotherapy Center, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Maria de Fátima Sonati
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil; National Institute of Blood Science and Technology, National Council for Scientific and Technological Development (CNPq), Ministry of Science and Technology (MCT), Brazil.
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Joly P, Garcia C, Lacan P, Couprie N, Francina A. Two new hemoglobin variants: Hb Aix-Les-Bains [β5(A2)Pro→Leu; HBB:c.17 C>T] and Hb Dubai [α122(H5)His→Leu (α2); HBA2:c.368 A>T]. Hemoglobin 2011; 35:147-51. [PMID: 21417572 DOI: 10.3109/03630269.2010.550795] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We report two new hemoglobin (Hb) variants; one causing an impairment of the N-terminal glycation of the β-globin chain and the other a hematological phenotype of α-thalassemia (α-thal). The first variant is Hb Aix-les-Bains [β5(A2)Pro→Leu] and the second Hb Dubai [α122(H5)His→Leu (α2)]. These two new Hb variants were detected by chromatographic and electrophoretic methods and characterized by molecular studies. Hb Dubai gives an α-thalassemic phenotype and should be routinely detected for preventing severe Hb H disease in couples at-risk for α-thal.
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Affiliation(s)
- Philippe Joly
- Unité de Pathologie Moléculaire du Globule Rouge, Laboratoire de Biochimie et de Biologie Moléculaire, Hôpital Edouard Herriot, Hospices Civils de Lyon, Lyon, France
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Wong WS, Chan AYY, Yip SF, Ma ESK. Thalassemia Intermedia Due to Co‐inheritance of β0/β+‐Thalassemia and (– –SEA)α‐Thalassemia/Hb Westmead [α122(H5)His > Gln (α2)] in a Chinese Family. Hemoglobin 2009; 28:151-6. [PMID: 15182058 DOI: 10.1081/hem-120035917] [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: 11/03/2022]
Abstract
Two brothers from a Chinese family with beta-thalassemia intermedia who harbor both alpha- and beta-globin gene defects are described. They are both compound heterozygous for codons 41/42 (-CTTT) beta0-thalassemia and nt - 28 (A > G) beta(+)-thalassemia mutations together with concurrent (- -SEA) alpha-thalassemia (SEA) deletion. One sibling also harbors Hb Westmead, giving an unusual genotype of beta0/beta(+)-thalassemia and (- -SEA) alpha-thalassemia/Hb Westmead. With respect to the age at presentation and transfusion requirement, this subject shows a milder clinical phenotype than his brother, most probably explainable by the presence of Hb Westmead in addition to the SEA deletion, which causes a further amelioration of the alpha-chain excess and hence a less severe disease. For areas with high prevalence of both alpha- and beta-thalassemia mutations, their interactions should always be considered in genotype phenotype correlation. Moreover, routine laboratory diagnostic strategy for non-deletional alpha-globin gene mutations in the Chinese may need to include Hb Westmead, as it is a common alpha-globin gene mutation in our population apart from Hb Constant Spring and Hb Quong Sze.
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Affiliation(s)
- Wai-Shan Wong
- Division of Hematology, Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Hong Kong, PR China
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International Hemoglobin Information Center Policies - IHIC. Hemoglobin 2009. [DOI: 10.3109/03630268108991816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Molchanova TP, Huisman TH. The importance of the 3' untranslated region for the expression of the alpha-globin genes. Hemoglobin 1996; 20:41-54. [PMID: 8745431 DOI: 10.3109/03630269609027909] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
With a reverse transcription-polymerase chain reaction procedure, we have determined the relative quantities of alpha 2- and alpha 1-mRNA in several patients with heterozygosities for alpha 2- or alpha 1-globin gene mutations, in subjects with two forms of alpha-thalassemia-2 (-3.7 kb; -4.2 kb), and in two children with an alpha-globin gene triplication. Mutations in either one of the two genes do not affect the mRNA production, and the alpha 2- to alpha 1-mRNA ratios in our heterozygotes are the same (approximately 2.7) as in normal persons with four alpha-globin genes, while the alpha/alpha X ratios of approximately 1.7 for alpha 2 variants and of approximately 6.2 for alpha 1 variants agree with the theoretic values. The deletion of 3.7 kb (leading to the formation of the alpha 2 alpha 1 hybrid gene) and of 4.2 kb (resulting in the presence of only the alpha 1 gene) causes the alpha 2/alpha 1 ratio to decrease to approximately 1.7, indicating that both are expressed as an alpha 1 gene. Data obtained for an Hb G-Philadelphia heterozygote (alpha alpha/-alpha G) show that the alpha 2 alpha 1 hybrid gene produces approximately 30% less mRNA than an alpha 1-globin gene on a normal chromosome, which may be caused by loss of some sequences 3' to the alpha 2 gene. The same may be the case for the alpha 1-globin gene on the chromosome with the 4.2 kb alpha-thal-2 deletion. These results suggest an important role for sequences located 3' to the terminating codon in regulating transcription. Support for this hypothesis was obtained from data for the two children with an alpha-globin gene triplication; the high alpha 2/alpha 1-mRNA ratio can be explained by assuming that the alpha 1 alpha 2 hybrid gene of the alpha 2(alpha 1 alpha 2)alpha 1 triplication expresses as an alpha 2 gene.
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Affiliation(s)
- T P Molchanova
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta 30912-2100, USA
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Gu YC, Gu LH, Wilson JB, Cepreganova B, Ramachandran M, Walker EL, Huisman TH, Potitong P. Hb Westmead [alpha 122(H5)His----Gln], Hb E [beta 26(B8)Glu----Lys], and alpha-thalassemia-2 (3.7 Kb deletion) in a Laotian family. Hemoglobin 1991; 15:297-302. [PMID: 1787098 DOI: 10.3109/03630269109027882] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Y C Gu
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta 30912-2100
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Jiang NH, Liang S, Wen XJ, Liang R, Su C, Tang Z. Hb Westmead: an alpha 2-globin gene mutation detected by polymerase chain reaction and Stu I cleavage. Hemoglobin 1991; 15:291-5. [PMID: 1686260 DOI: 10.3109/03630269109027881] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Hb Westmead or alpha 2 122(H5)His----Gln beta 2 is one of the most common hemoglobin variants in Guangxi, a province in Southern China. The alpha 2-globin DNA sequence of a carrier for this variant was selectively amplified by the polymerase chain reaction and analyzed with the restriction enzyme Stu I. We found that this mutant globin was encoded at the alpha 2 locus and that the CAC----CAG mutation at codon 122 created a new Stu I restriction site. It is easy to detect this mutation by these methods.
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Affiliation(s)
- N H Jiang
- Department of Pediatrics, Guangxi Medical College, Nanning, P.R. China
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Liang S, Tang Z, Su C, Lung Q, Liang R, Fei YJ, Kutlar F, Wilson JB, Webber BB, Hu H. Hb Duan [alpha 75(EF4)Asp----Ala], Hb Westmead [alpha 122(H5)His----Gln], and alpha-thalassemia-2 (-4.2 Kb deletion) in a Chinese family. Hemoglobin 1988; 12:13-21. [PMID: 3384694 DOI: 10.3109/03630268808996878] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Detailed data are presented concerning the relative amounts of Hb A and two alpha chain variants (Hb Duan with alpha 75 Asp----Ala, and Hb Westmead with alpha 122 His----Gln), and the occurrence of an alpha-thalassemia-2 heterozygosity in five members of a small Chinese family. The three children who have the three abnormalities inherited the alpha-Duan and alpha-thalassemia-2 heterozygosities from their father, and the alpha-Westmead heterozygosity from their mother. The base substitution which leads to the synthesis of the alpha-Duan chain occurred at codon 75 of the alpha 1 globin gene of the chromosome which also carried the alpha-thalassemia-2 deletion; the concentration of alpha-Duan (37% of total alpha) is similar to that observed for other alpha chain variants, linked to an alpha-thalassemia-2 condition.
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Affiliation(s)
- S Liang
- Guangxi Medical College, P.R. China
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Gurney H, Baig I, Gordon S, Phadke K, Kearsley H, Fleming P, Wyatt K, Hughes W. A second Australian family with hemoglobin North Shore (beta 134 Val----Glu). Pathology 1987; 19:62-3. [PMID: 3588028 DOI: 10.3109/00313028709065138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A second Australian family is reported with Hemoglobin North Shore (beta 134 Val----Glu), an unstable hemoglobin, causing no clinical symptoms. All affected family members showed only mild reticulocytosis and microcytosis on the blood film, despite the strongly positive isopropanol test for Hb (hemoglobin) stability and numerous red cell inclusions. Hb North Shore constituted 31-38% of the total hemoglobin and migrated on the anodal side of Hb A at pH 8.9. The association of a mildly raised Hb A2 level and thalassemic phenotype with Hb North Shore previously reported, is confirmed in this study.
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Trent RJ, Harris MG, Fleming PJ, Wyatt K, Hughes WG, Kronenberg H. Haemoglobin D Punjab. Interaction with alpha thalassaemia and diagnosis by gene mapping. SCANDINAVIAN JOURNAL OF HAEMATOLOGY 1984; 32:275-82. [PMID: 6322284 DOI: 10.1111/j.1600-0609.1984.tb01693.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A family which illustrates the inheritance of Hb D Punjab (a beta globin chain variant) and alpha thalassaemia is described. Interaction between Hb D Punjab and alpha thalassaemia is observed since levels of Hb D vary according to the number of alpha globin genes deleted. The technique of gene mapping has been utilised in the current study to provide definitive evidence of alpha thalassaemia and also demonstrates a novel way to identify Hb D Punjab.
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