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Wang G, Deng H, Peng P, Zheng H, Tian B, Zhu C. Compound heterozygosity for Southeast Asian hereditary persistence of fetal hemoglobin and β0-thalassemia results in thalassemia intermedia: Pedigree analysis and genetic research in a family from South China. A case report. Medicine (Baltimore) 2024; 103:e37446. [PMID: 38457547 PMCID: PMC10919527 DOI: 10.1097/md.0000000000037446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 02/09/2024] [Indexed: 03/10/2024] Open
Abstract
RATIONALE Compound heterozygotes for deletional β-thalassemia can be difficult to diagnose due to its diverse clinical presentations and no routine screenings. This can lead to disease progression and delay in treatment. PATIENT CONCERNS We reported pedigree analysis and genetic research in a family with rare β-thalassemia. DIAGNOSIS Pedigree analysis and genetic research demonstrated that the patient was a compound heterozygote for β-thalassemia CD17/Southeast Asian hereditary persistence of fetal hemoglobin deletion, inherited from the parents. Magnetic resonance imaging T2* examination revealed severe iron deposition in the liver. Echocardiography revealed endocardial cushion defect. INTERVENTIONS The patient was treated with Deferasirox after receiving the final molecular genetic diagnosis. The initial once-daily dose of Deferasirox was 20 mg/kg/d. OUTCOMES The patient discontinued the medication three months after the first visit. Two years later, the patient visited the Department of Hepatobiliary and Pancreatic Diseases. He was recommended to undergo splenectomy after surgical repair of the congenital heart disease. However, the patient refused surgical treatment because of the economic burden. LESSONS We report that fetal hemoglobin is a sensitive indicator for screening large deletions of the β-globin gene, which can be effectively confirmed by the multiplex ligation-dependent probe amplification assay. In non-transfusion-dependent thalassemia patients, iron status assessment should be regularly performed, and iron chelation treatment should be initiated early. This case will provide insights for the diagnosis of rare genotypes of β-thalassemia and has important implications for genetic counseling.
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Affiliation(s)
- Guangli Wang
- Genetics and Precision Medicine Laboratory, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Huiping Deng
- Genetics and Precision Medicine Laboratory, Affiliated Hospital of Guilin Medical University, Guilin, China
- Department of Neonatology, The Third People’s Hospital of Hubei province, Wuhan, China
| | - Peng Peng
- Department of Radiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Haiqing Zheng
- Genetics and Precision Medicine Laboratory, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Baodong Tian
- Genetics and Precision Medicine Laboratory, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Chunjiang Zhu
- Genetics and Precision Medicine Laboratory, Affiliated Hospital of Guilin Medical University, Guilin, China
- Department of Pediatrics, Affiliated Hospital of Guilin Medical University, Guilin, China
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2
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Bellad A, Rangiah K, Sathe G, Dey G, Appadorai PK, Lokanatha H, Murthy PR, Gowdra A, Pandey A. Identification of a rare [ G γ( A γδβ) 0 ] -thalassemia using tandem mass spectrometry. Proteomics 2024:e2300495. [PMID: 38212249 DOI: 10.1002/pmic.202300495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 12/23/2023] [Accepted: 01/03/2024] [Indexed: 01/13/2024]
Abstract
Thalassemias are a group of inherited monogenic disorders characterized by defects in the synthesis of one or more of the globin chain subunits of the hemoglobin tetramer. Delta-beta (δβ-) thalassemia has large deletions in the β globin gene cluster involving δ- and β-globin genes, leading to absent or reduced synthesis of both δ- and β-globin chains. Here, we used direct globin-chain analysis using tandem mass spectrometry for the diagnosis of δβ-thalassemia. Two cases from unrelated families were recruited for the study based on clinical and hematological evaluation. Peptides obtained after trypsin digestion of proteins extracted from red blood cell pellets from two affected individuals and their parents were analyzed using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Mass spectrometric analysis revealed a severe reduction in δ, β, and Aγ globin proteins with increased G γ globin protein in the affected individuals. The diagnosis of G γ(A γδβ)0 -thalassemia in the homozygous state in the affected individuals and in the heterozygous state in the parents was made from our results. The diagnosis was confirmed at the genetic level using multiplex ligation-dependent probe amplification (MLPA). Our findings demonstrate the utility of direct globin protein quantitation using LC-MS/MS to quantify individual globin proteins reflecting changes in globin production. This approach can be utilized for accurate and timely diagnosis of hemoglobinopathies, including rare variants, where existing diagnostic methods provide inconclusive results.
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Affiliation(s)
- Anikha Bellad
- Manipal Academy of Higher Education, Manipal, Karnataka, India
- Institute of Bioinformatics, International Technology Park, Bangalore, Karnataka, India
| | - Kannan Rangiah
- Manipal Academy of Higher Education, Manipal, Karnataka, India
- Institute of Bioinformatics, International Technology Park, Bangalore, Karnataka, India
| | - Gajanan Sathe
- Institute of Bioinformatics, International Technology Park, Bangalore, Karnataka, India
| | - Gourav Dey
- Institute of Bioinformatics, International Technology Park, Bangalore, Karnataka, India
| | | | - Hemalatha Lokanatha
- Department of Pathology, Indira Gandhi Institute of Child Health, Bangalore, Karnataka, India
| | - Pradeep Rudra Murthy
- Department of Pathology, Indira Gandhi Institute of Child Health, Bangalore, Karnataka, India
| | - Aruna Gowdra
- Department of Biochemistry, Indira Gandhi Institute of Child Health, Bangalore, Karnataka, India
| | - Akhilesh Pandey
- Manipal Academy of Higher Education, Manipal, Karnataka, India
- Institute of Bioinformatics, International Technology Park, Bangalore, Karnataka, India
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Center for Individualized Medicine, Mayo Clinic, Rochester, Minnesota, USA
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3
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Minaidou A, Tamana S, Stephanou C, Xenophontos M, Harteveld CL, Bento C, Kleanthous M, Kountouris P. A Novel Tool for the Analysis and Detection of Copy Number Variants Associated with Haemoglobinopathies. Int J Mol Sci 2022; 23:ijms232415920. [PMID: 36555557 PMCID: PMC9782104 DOI: 10.3390/ijms232415920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/05/2022] [Accepted: 12/08/2022] [Indexed: 12/23/2022] Open
Abstract
Several types of haemoglobinopathies are caused by copy number variants (CNVs). While diagnosis is often based on haematological and biochemical parameters, a definitive diagnosis requires molecular DNA analysis. In some cases, the molecular characterisation of large deletions/duplications is challenging and inconclusive and often requires the use of specific diagnostic procedures, such as multiplex ligation-dependent probe amplification (MLPA). Herein, we collected and comprehensively analysed all known CNVs associated with haemoglobinopathies. The dataset of 291 CNVs was retrieved from the IthaGenes database and was further manually annotated to specify genomic locations, breakpoints and MLPA probes relevant for each CNV. We developed IthaCNVs, a publicly available and easy-to-use online tool that can facilitate the diagnosis of rare and diagnostically challenging haemoglobinopathy cases attributed to CNVs. Importantly, it facilitates the filtering of available entries based on the type of breakpoint information, on specific chromosomal and locus positions, on MLPA probes, and on affected gene(s). IthaCNVs brings together manually curated information about CNV genomic locations, functional effects, and information that can facilitate CNV characterisation through MLPA. It can help laboratory staff and clinicians confirm suspected diagnosis of CNVs based on molecular DNA screening and analysis.
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Affiliation(s)
- Anna Minaidou
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia 2371, Cyprus
| | - Stella Tamana
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia 2371, Cyprus
| | - Coralea Stephanou
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia 2371, Cyprus
| | - Maria Xenophontos
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia 2371, Cyprus
| | - Cornelis L. Harteveld
- Human and Clinical Genetics Department, Leiden University Medical Center, P.O. Box 9600, 2333 ZC Leiden, The Netherlands
| | - Celeste Bento
- Department of Haematology, Centro Hospitalar e Universitário de Coimbra, 3000-075 Coimbra, Portugal
| | - Marina Kleanthous
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia 2371, Cyprus
| | - Petros Kountouris
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia 2371, Cyprus
- Correspondence: ; Tel.: +357-22392623
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4
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Hu S, Zhan W, Wang J, Xie J, Zhou W, Yang X, Zeng Y, Hu T, Duan L, Chen K, Du L, Yin A, Luo M. Establishment and application of a novel method based on single nucleotide polymorphism analysis for detecting β-globin gene cluster deletions. Sci Rep 2020; 10:18298. [PMID: 33106596 PMCID: PMC7588424 DOI: 10.1038/s41598-020-75507-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 10/12/2020] [Indexed: 12/03/2022] Open
Abstract
β-Globin gene mutations reduce or terminate the production of beta globin chains, of which approximately 10% are large deletions within the β-globin gene cluster. Because gene deletion leads to loss of heterozygosity at single nucleotide polymorphism (SNP), a novel method for detecting β-globin gene cluster deletions based on SNP heterozygosity analysis was established in this study. The location range of SNPs was selected according to the breakpoint of β-globin gene cluster deletions. SNPs were screened using bioinformatics analysis and population sequencing data. A novel method which enables genotyping of multiplex SNPs based on tetra-primer ARMS-PCR was designed and optimized. Forty clinical samples were tested in parallel by this method and MLPA to verify the performance of this method for detecting β-globin gene cluster deletion. Six informative SNPs were obtained, achieving heterozygote coverage of 93.3% in normal individuals. Genotyping of six SNPs were successfully integrated into two multiplex tetra-primer ARMS-PCR reactions. The sensitivity, specificity, positive predictive value and negative predictive value of the method for detecting β-globin gene cluster deletion were 100%, 96.30%, 92.86%, and 100%, respectively. This is a simple, cost-effective and novel method for detecting β-globin gene cluster deletions, which may be suitable for use in combination with MLPA for thalassemia molecular testing.
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Affiliation(s)
- Siqi Hu
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetics Center, Affiliated Shenzhen Maternity & Child Healthcare Hospital, Southern Medical University, Shenzhen, Guangdong, China
| | - Wenli Zhan
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China
| | - Jicheng Wang
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China
| | - Jia Xie
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China
| | - Weiping Zhou
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China
| | - Xiaohan Yang
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China
| | - Yukun Zeng
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China
| | - Tingting Hu
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China
| | - Lei Duan
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China
| | - Keyi Chen
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China
| | - Li Du
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China
| | - Aihua Yin
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China.,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China
| | - Mingyong Luo
- Medical Genetic Centre, Guangdong Women and Children's Hospital, Guangzhou Medical University, 521-523 Xingnan Avenue, Panyu District, Guangzhou, 511400, China. .,Medical Genetic Centre, Guangdong Women and Children Hospital, Guangzhou, China.
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5
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Jiang F, Zuo L, Li D, Li J, Tang X, Chen G, Zhou J, Lu H, Liao C. Molecular epidemiology and hematologic characterization of δβ-thalassemia and hereditary persistence of fetal hemoglobin in 125,661 families of greater Guangzhou area, the metropolis of southern China. BMC MEDICAL GENETICS 2020; 21:43. [PMID: 32111191 PMCID: PMC7049201 DOI: 10.1186/s12881-020-0981-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Accepted: 02/19/2020] [Indexed: 11/10/2022]
Abstract
Background Individuals with δβ-thalassemia/HPFH and β-thalassemia usually present with intermedia or thalassemia major. No large-scale survey on HPFH/δβ-thalassemia in southern China has been reported to date. The purpose of this study was to examine the molecular epidemiology and hematologic characteristics of these disorders in Guangzhou, the largest city in Southern China, to offer advice for thalassemia screening programs and genetic counseling. Methods A total of 125,661 couples participated in pregestational thalassemia screening. 654 subjects with fetal hemoglobin (HbF) level ≥ 5% were selected for further investigation. Gap-PCR combined with Multiplex ligation dependent probe amplification (MLPA) was used to screen for β-globin gene cluster deletions. Gene sequencing for the promoter region of HBG1 /HBG2 gene was performed for all those subjects. Results A total of 654 individuals had hemoglobin (HbF) levels≥5, and 0.12% of the couples were found to be heterozygous for HPFH/δβ-thalassemia, including Chinese Gγ (Aγδβ)0-thal, Southeast Asia HPFH (SEA-HPFH), Taiwanese deletion and Hb Lepore–Boston–Washington. The highest prevalence was observed in the Huadu district and the lowest in the Nansha district. Three cases were identified as carrying β-globin gene cluster deletions, which had not been previously reported. Two at-risk couples (0.0015%) were required to receive prenatal diagnosis. We also found 55cases of nondeletional-HPFH (nd-HPFH), including 54 with Italian nd-HPFH and one with the Aγ-197C-T heterozygous state. It is difficult to discriminate between Chinese Gγ (Aγδβ)0-thal and Italian nd-HPFH carriers using hemoglobin (Hb) analysis. Conclusions This study is the first to describe the familial prevalence of HPFH/δβ-thalassemia and the high-risk rate in Greater Guangzhou Area, and the findings will support the implementation of thalassemia screening for three common deletions by gap-PCR. We also presented a systematic description of genotype-phenotype relationships which will be useful for genetic counseling and prenatal diagnostic services for β-thalassemia intermedia.
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Affiliation(s)
- Fan Jiang
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong Province, People's Republic of China.,Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated with Guangzhou Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Liandong Zuo
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated with Guangzhou Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Dongzhi Li
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated with Guangzhou Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Jian Li
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated with Guangzhou Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Xuewei Tang
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated with Guangzhou Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Guilan Chen
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated with Guangzhou Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Jianying Zhou
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated with Guangzhou Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Hang Lu
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated with Guangzhou Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Can Liao
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong Province, People's Republic of China. .,Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated with Guangzhou Medical University, Guangzhou, Guangdong Province, People's Republic of China.
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6
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7
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Zhu F, Wei X, Cai D, Pang D, Zhong J, Liang M, Zuo Y, Xu X, Shang X. A novel 223 kb deletion in the beta-globin gene cluster was identified in a Chinese thalassemia major patient. Int J Lab Hematol 2019; 41:456-460. [PMID: 30945812 DOI: 10.1111/ijlh.13021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 02/19/2019] [Accepted: 03/08/2019] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Although mutations in the human beta-globin gene cluster are essentially point mutations, several large deletions have been described in recent years. METHODS We have identified a novel 223 kb deletion in a Chinese patient by multiplex ligation-dependent probe amplification and characterized it by next-generation sequencing, Gap-PCR, and DNA sequence analysis. RESULTS The deletion extends from the 3'UTR of the δ globin gene (HBD) to 215 kb downstream of the HBB. Compound heterozygous with the typical β-thalassemia-CD41-42(-CTTT) mutation, the proband presented with microcytosis and hypochromic red cells, and required regulate transfusion. The patient was clinically diagnosed with thalassemia major. CONCLUSION Our study widens the mutation spectrum of β-thalassemia. In addition, this case may spark future studies of the regulatory regions of the beta-globin gene cluster.
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Affiliation(s)
- Fei Zhu
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Xiaofeng Wei
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Decheng Cai
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Dejian Pang
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Jianmei Zhong
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Min Liang
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Yangjin Zuo
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - Xiangmin Xu
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.,Guangdong Genetics Testing Engineering Research Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Single Cell Technology and Application, Guangzhou, China
| | - Xuan Shang
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.,Guangdong Genetics Testing Engineering Research Center, Guangzhou, China.,Guangdong Provincial Key Laboratory of Single Cell Technology and Application, Guangzhou, China
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8
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He S, Wei Y, Lin L, Chen Q, Yi S, Zuo Y, Wei H, Zheng C, Chen B, Qiu X. The prevalence and molecular characterization of (δβ) 0 -thalassemia and hereditary persistence of fetal hemoglobin in the Chinese Zhuang population. J Clin Lab Anal 2017; 32. [PMID: 28763119 PMCID: PMC5888142 DOI: 10.1002/jcla.22304] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 07/04/2017] [Indexed: 11/10/2022] Open
Abstract
Objective To reveal the prevalence and molecular characterization of (δβ)0‐thalassemia [(δβ)0‐thal] and hereditary persistence of fetal hemoglobin (HPFH) in the Chinese Zhuang population. Methods A total of 105 subjects with fetal hemoglobin (Hb F) level ≥5% from 14 204 unrelated ones were selected for the study. Multiplex ligation dependent probe amplification was firstly used to analyze dosage changes of the β‐globin gene cluster for associated with (δβ)0‐thal and HPFH mutations. The gap polymerase chain reaction was then performed to identify the deletions using the respective flanking primers. Hematologic data were recorded and correlated with the molecular findings. Results Twenty‐one (0.15%) subjects were diagnosed with Chinese Gγ(Aγδβ)0‐thal. Nine (0.06%) were diagnosed with Southeast Asia HPFH (SEA‐HPFH) deletion. Seventy‐five (0.53%) cases remained uncharacterized. Three genotypes for Chinese Gγ(Aγδβ)0‐thal and SEA‐HPFH deletion were identified, respectively. The genotype‐phenotype relationships were discussed. Conclusion Our study for the first time demonstrated that (δβ)0 and HPFH were not rare events, and molecular characterized Gγ(Aγδβ)0‐thal and HFPH mutations in the Chinese Zhuang population. The findings in our study will be useful in genetic counseling and prenatal diagnostic service of β‐thalassemia in this populations.
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Affiliation(s)
- Sheng He
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - Yuan Wei
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - Li Lin
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - Qiuli Chen
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - Shang Yi
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - Yangjin Zuo
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - Hongwei Wei
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - Chenguang Zheng
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - Biyan Chen
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
| | - XiaoXia Qiu
- Prenatal Diagnosis Center, Guangxi Zhuang Autonomous Region Women and Children Care Hospital, Nanning, China
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9
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Bissé E, Schaeffer-Reiss C, Van Dorsselaer A, Alayi TD, Epting T, Winkler K, Benitez Cardenas AS, Soman J, Birukou I, Samuel PP, Olson JS. Hemoglobin Kirklareli (α H58L), a New Variant Associated with Iron Deficiency and Increased CO Binding. J Biol Chem 2016; 292:2542-2555. [PMID: 28011635 DOI: 10.1074/jbc.m116.764274] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 12/19/2016] [Indexed: 11/06/2022] Open
Abstract
Mutations in hemoglobin can cause a wide range of phenotypic outcomes, including anemia due to protein instability and red cell lysis. Uncovering the biochemical basis for these phenotypes can provide new insights into hemoglobin structure and function as well as identify new therapeutic opportunities. We report here a new hemoglobin α chain variant in a female patient with mild anemia, whose father also carries the trait and is from the Turkish city of Kirklareli. Both the patient and her father had a His-58(E7) → Leu mutation in α1. Surprisingly, the patient's father is not anemic, but he is a smoker with high levels of HbCO (∼16%). To understand these phenotypes, we examined recombinant human Hb (rHb) Kirklareli containing the α H58L replacement. Mutant α subunits containing Leu-58(E7) autoxidize ∼8 times and lose hemin ∼200 times more rapidly than native α subunits, causing the oxygenated form of rHb Kirklareli to denature very rapidly under physiological conditions. The crystal structure of rHb Kirklareli shows that the α H58L replacement creates a completely apolar active site, which prevents electrostatic stabilization of bound O2, promotes autoxidation, and enhances hemin dissociation by inhibiting water coordination to the Fe(III) atom. At the same time, the mutant α subunit has an ∼80,000-fold higher affinity for CO than O2, causing it to rapidly take up and retain carbon monoxide, which prevents denaturation both in vitro and in vivo and explains the phenotypic differences between the father, who is a smoker, and his daughter.
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Affiliation(s)
- Emmanuel Bissé
- From the Institute for Clinical Chemistry and Laboratory Medicine, University Medical Center, Hugstetterstrasse 55, D-79106 Freiburg, Germany
| | - Christine Schaeffer-Reiss
- the BioOrganic Mass Spectrometry Laboratory (LSMBO), IPHC, Université de Strasbourg, 25 Rue Becquerel, 67087 Strasbourg, France.,the IPHC, CNRS, UMR7178, 67087 Strasbourg, France, and
| | - Alain Van Dorsselaer
- the BioOrganic Mass Spectrometry Laboratory (LSMBO), IPHC, Université de Strasbourg, 25 Rue Becquerel, 67087 Strasbourg, France.,the IPHC, CNRS, UMR7178, 67087 Strasbourg, France, and
| | - Tchilabalo Dilezitoko Alayi
- the BioOrganic Mass Spectrometry Laboratory (LSMBO), IPHC, Université de Strasbourg, 25 Rue Becquerel, 67087 Strasbourg, France.,the IPHC, CNRS, UMR7178, 67087 Strasbourg, France, and
| | - Thomas Epting
- From the Institute for Clinical Chemistry and Laboratory Medicine, University Medical Center, Hugstetterstrasse 55, D-79106 Freiburg, Germany
| | - Karl Winkler
- From the Institute for Clinical Chemistry and Laboratory Medicine, University Medical Center, Hugstetterstrasse 55, D-79106 Freiburg, Germany
| | | | - Jayashree Soman
- the BioSciences Department, Rice University, Houston, Texas 77281
| | - Ivan Birukou
- the BioSciences Department, Rice University, Houston, Texas 77281
| | - Premila P Samuel
- the BioSciences Department, Rice University, Houston, Texas 77281
| | - John S Olson
- the BioSciences Department, Rice University, Houston, Texas 77281
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10
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Wu MY, Li J, Yan JM, Zhang Y, Li DZ. Characterization of a novel β-globin gene cluster deletion causing (Aγδβ)0-thalassemia by next-generation sequencing. Int J Lab Hematol 2016; 39:e19-e22. [DOI: 10.1111/ijlh.12580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M.-Y. Wu
- Prenatal Diagnostic Center; Guangzhou Women and Children Medical Center affiliated to Guangzhou Medical University; Guangzhou Guangdong China
| | - J. Li
- Prenatal Diagnostic Center; Guangzhou Women and Children Medical Center affiliated to Guangzhou Medical University; Guangzhou Guangdong China
| | - J.-M. Yan
- Prenatal Diagnostic Center; Guangzhou Women and Children Medical Center affiliated to Guangzhou Medical University; Guangzhou Guangdong China
| | | | - D.-Z. Li
- Prenatal Diagnostic Center; Guangzhou Women and Children Medical Center affiliated to Guangzhou Medical University; Guangzhou Guangdong China
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Bilgen T, Altıok Clark Ö, Öztürk Z, Yeşilipek MA, Keser İ. Gap-PCR Screening for Common Large Deletional Mutations of β-Globin Gene Cluster Revealed a Higher Prevalence of the Turkish Inversion/Deletion (δβ)0 Mutation in Antalya. Turk J Haematol 2015; 33:107-11. [PMID: 26377447 PMCID: PMC5100720 DOI: 10.4274/tjh.2014.0242] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
OBJECTIVE Although the calculated carrier frequency for point mutations of the β-globin gene is around 10% for Antalya Province, nothing is known about the profile of large deletional mutations involving the β-globin gene. In this study, we aimed to screen common deletional mutations in the β-globin gene cluster in patients for whom direct DNA sequencing was not able to demonstrate the mutation(s) responsible for the disease phenotype. MATERIALS AND METHODS Thirty-one index cases selected with a series of selection events among 60 cases without detected β-globin gene mutation from 580 thalassemia-related cases tested by direct sequencing over the last 4 years in our diagnostic center were screened for the most common 8 different large deletional mutations of the β-globin gene cluster by gap-PCR. RESULTS We detected 1 homozygous and 9 heterozygous novel unrelated cases for the Turkish inversion/deletion (δβ)0 mutation in our series of 31 cases. Our study showed that the Turkish inversion/deletion (δβ)0 mutation per se accounts for 16.6% of the unidentified causative alleles and also accounts for 1.5% of all detected mutations over the last 4 years in our laboratory. CONCLUSION Since molecular diagnosis of deletional mutations in the β-globin gene cluster warrants different approaches, it deserves special attention in order to provide prenatal diagnosis and prevention opportunities to the families involved. We conclude that the Turkish inversion/deletion (δβ)0, as the most prevalent deletional mutation detected so far, has to be routinely tested for in Antalya, and the gap-PCR approach has valuable diagnostic potential in the patients at risk.
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Affiliation(s)
- Türker Bilgen
- Namık Kemal University Central Research Laboratory (NABİLTEM), Tekirdağ, Turkey, E-mail : ,
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12
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Cai WJ, Li J, Xie XM, Li DZ. Screening for common β-globin gene cluster deletions in Chinese individuals with increased hemoglobin F. Int J Lab Hematol 2015; 37:752-7. [PMID: 26179971 DOI: 10.1111/ijlh.12401] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Accepted: 06/10/2015] [Indexed: 11/29/2022]
Abstract
INTRODUCTION The aim of this study was to determine the prevalence of β-globin gene cluster deletions in individuals with increased Hb F levels in a Chinese population. METHODS Subjects with HbF levels ≥ 10% were selected for further investigation. Gap-PCR was used to screen for three common β-globin gene cluster deletions: Chinese ((A) γδβ)(0)-thalassemia, Southeast Asian (SEA) deletion and Hb Lepore. Multiplex ligation-dependent probe amplification (MLPA) was used to analyze dosage changes of the β-globin gene cluster for those not associated with one of the three common deletions. RESULTS One hundred and thirty-one individuals had an increased Hb F level; among these, 51 (38.9%) were showed to have Chinese ((A) γδβ)(0)-thalassemia (n = 37) or SEA deletion (n = 14). A single case of Hb Lepore-Boston-Washington was detected. MLPA only detected 2 deletions in three cases of the remaining 80 patients. Gap-PCR confirmed that they included a 1357 bp β-globin gene deletion (NG_000007.3:g.69997_71353del1357) in one case and a HBG2-HBG1 fusion gene consisting of exons 1 and 2 of HBG2 ((G) γ-globin gene) and exon 3 of HBG1 ((A)γ-globin gene) (HBG2:c.315 + 573_HBG1: c.315 + 572del) in two cases. CONCLUSION The Chinese ((A) γδβ)(0)-thalassemia and SEA deletion are the most common large deletions of β-globin gene cluster in Chinese. Gap-PCR for the detection of these two deletions should be used in thalassemia screening program in China where the incidence of β-thalassemia is high.
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Affiliation(s)
- W-J Cai
- Prenatal Diagnostic Center, Guangzhou Women & Children Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - J Li
- Prenatal Diagnostic Center, Guangzhou Women & Children Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - X-M Xie
- Prenatal Diagnostic Center, Guangzhou Women & Children Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - D-Z Li
- Prenatal Diagnostic Center, Guangzhou Women & Children Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
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So CC, Liu AK, Tsang MH, Ngai DY, Leung KS, Chan AY. Genetic basis of persistent red blood cell microcytosis in the Chinese unexplained by phenotypical testing. J Clin Pathol 2014; 68:69-72. [PMID: 25352644 DOI: 10.1136/jclinpath-2014-202568] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIMS Hypochromic microcytic anaemia is the hallmark phenotype of thalassaemia. Current phenotypical tests do not provide a diagnosis in a small proportion of patients with red blood cell microcytosis. We aim to evaluate the genetic basis of red cell microcytosis in these cases in our Chinese population. METHODS We identified from a large cohort of 1684 unselected requests for thalassaemia testing 23 Chinese subjects who had unexplained microcytosis after phenotypical iron and haemoglobin studies. In 18 of these subjects with available DNA, extensive genotypical analysis of the α and β globin gene cluster was performed, including gap-PCR, multiplex amplification-refractory mutation system, Sanger sequencing and multiplex ligation-dependent probe amplification. RESULTS Occult single and double α globin gene (HBA1, HBA2) deletions and α thalassaemic haemoglobinopathies (Haemoglobin Quong Sze, Haemoglobin Constant Spring) were the genetic basis for the microcytosis. Occult β globin gene (HBB) mutations and δ globin gene (HBD) abnormalities masking β thalassaemia are not seen. CONCLUSIONS A cost-effective genotyping approach for the detection of these occult globin gene mutations can be proposed. The identification of these mutations is important for making a diagnosis and for the provision of accurate genetic counselling. (This paper adds to our understanding of the genetic basis of red blood cell microcytosis in clinical practice, and it provides a cost-effective approach for genotyping in diagnostic laboratories).
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Affiliation(s)
- Chi-Chiu So
- Department of Pathology, Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Ada K Liu
- Department of Pathology and Clinical Biochemistry, Queen Mary Hospital, Hong Kong, Hong Kong
| | - Mandy H Tsang
- Department of Pathology and Clinical Biochemistry, Queen Mary Hospital, Hong Kong, Hong Kong
| | - Donna Y Ngai
- Department of Pathology and Clinical Biochemistry, Queen Mary Hospital, Hong Kong, Hong Kong
| | - Kin-Sang Leung
- Department of Pathology and Clinical Biochemistry, Queen Mary Hospital, Hong Kong, Hong Kong
| | - Amy Y Chan
- Department of Pathology, Queen Elizabeth Hospital, Hong Kong, Hong Kong
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Abstract
Thalassemia is the most common monogenic inherited disease worldwide and it affects most countries to various extents. This review summarizes the current approaches to phenotypic and genotypic diagnosis of thalassemia in clinical practice. Prevention strategies that encompass carrier screening, genetic counseling and prenatal diagnosis are discussed. The importance of public education and an awareness of a changing perception regarding this group of diseases are emphasized. It also addresses the impact of the rapidly increasing knowledge in disease severity modification by hemoglobin F (Hb F).
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Affiliation(s)
- Ho-Wan Ip
- Department of Pathology and Clinical Biochemistry, Queen Mary Hospital , Hong Kong SAR , China and
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15
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So CC, Chan AYY, Ma ESK. Novel Point Mutation of the α2-Globin Gene (HBA2) and a Rare 2.4 kb Deletion of the α1-Globin Gene (HBA1), Identified in Two Chinese Patients with Hb H Disease. Hemoglobin 2014; 38:213-5. [DOI: 10.3109/03630269.2014.894478] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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16
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Lin M, Han ZJ, Wang Q, Zheng L, Wang Y, Yang H, Huang Y, Lin F, Zhan XF, Lin CP, Wu JR, Luo ZY, Liu JB, Yan ZH, Zheng SY, Zheng JK, Lu M, Zhu JJ, Xie LX, Yang LY. Molecular epidemiological survey of hemoglobinopathies in the Wuxi region of Jiangsu Province, eastern China. Hemoglobin 2013; 37:454-66. [PMID: 23806067 DOI: 10.3109/03630269.2013.807285] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In order to determine the prevalence and molecular characterization of hemoglobinopathies in the Wuxi region of Jiangsu Province in the People's Republic of China (PRC), a total of 10,297 healthy people selected from a regional hospital were screened. Hemoglobin (Hb) electrophoresis, complete blood cell (CBC) count, polymerase chain reaction (PCR), DNA sequencing, reverse dot-blot and multiplex ligation-dependent probe amplification (MLPA) were used to detect Hb variants, thalassemias and hereditary persistence of fetal Hb (HPFH). Two thousand and twenty-one adult subjects were screened for thalassemia, five cases were identified as α-thalassemia (α-thal) carriers including three cases of the -α(3.7) (rightward) deletion, one case of the - -(SEA) deletion and one case of β-thal [IVS-II-654 (C>T), (HBB: c.316-197C>T)]. The incidence of Hb variants, thalassemia and HPFH/δβ-thal were 0.136% (14/10,297), 0.25% (5/2021) and 0.0001% (1/10,297), respectively. Eight genotypes of Hb variants were found, including Hb E [β26(B8)Glu→Lys, GAG>AAG; HBB: c.79G>A], Hb J-Bangkok [β56(D7)Gly→Asp (GGC>GAC); HBB; c.170G>A], Hb G-Coushatta [β22(4)Glu→Ala (GAA>GCA); HBB: c.68A>C], Hb Queens [α34(B15)Leu→Arg (CTG>CGG) (α2 or α1); HBA2: c.104T>G (or HBA1)], Hb I [α16(A14)Lys→Glu, AAG>GAG (α1); HBA1: c.49A>G], Hb Beijing [α16(A14)Lys→Asn (AAG>AAC or AAT) (α2 or α1); HBA2: c.51G>C (or HBA1) or 51G>T (or HBA1)], Hb Ube-2 [α68(E17)Asn→Asp (AAC>GAC) (α2 or α1); HBA2: c.205A>G (or HBA1)] and Hb G-Taipei [β22(B4)Glu→Gly (GAA>GGA); HBB: c.68A>G]. A Sicilian δβ(0)-thal, identified for the first time in Asia, was also found in this survey.
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Affiliation(s)
- Min Lin
- Laboratory Medical Center, Chaozhou Central Hospital Affiliated to Southern Medical University, Chaozhou, Guangdong Province, People's Republic of China
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Hemoglobinopathy: molecular epidemiological characteristics and health effects on Hakka people in the Meizhou region, southern China. PLoS One 2013; 8:e55024. [PMID: 23383304 PMCID: PMC3562339 DOI: 10.1371/journal.pone.0055024] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Accepted: 12/18/2012] [Indexed: 11/19/2022] Open
Abstract
Background Hemoglobinopathies are the most common inherited diseases in southern China. However, there have been only a few epidemiological studies of hemoglobinopathies in Guangdong province. Materials and Methods Peripheral blood samples were collected from 15299 “healthy” unrelated subjects of dominantly ethnic Hakka in the Meizhou region, on which hemoglobin electrophoresis and routine blood tests were performed. Suspected cases with hemoglobin variants and hereditary persistence of fetal hemoglobin (HPFH) were further characterized by PCR, DNA sequencing, reverse dot blot (RDB) or multiplex ligation-dependent probe amplification (MLPA). In addition, 1743 samples were randomly selected from the 15299 subjects for thalassemia screening, and suspected thalassemia carriers were identified by PCR and RDB. Results The gene frequency of hemoglobin variants was 0.477% (73/15299). The five main subgroups of the ten hemoglobin variants were Hb E, Hb G-Chinese, Hb Q-Tahiland, Hb New York and Hb J-Bangkok. 277 cases (15.89%, 277/1743) of suspected thalassemia carriers with microcytosis (MCV<82 fl) were found by thalassemia screening, and were tested by a RDB gene chip to reveal a total of 196 mutant chromosomes: including 124 α-thalassemia mutant chromosomes and 72 β-thalassemia mutant chromosomes. These results give a heterozygote frequency of 11.24% for common α and β thalassemia in the Hakka population in the Meizhou region. 3 cases of HPFH/δβ-thalassemia were found, including 2 cases of Vietnamese HPFH (FPFH-7) and a rare Belgian Gγ(Aγδβ)0–thalassemia identified in Chinese. Conclusions Our results provide a detailed prevalence and molecular characterization of hemoglobinopathies in Hakka people of the Meizhou region. The estimated numbers of pregnancies each year in the Meizhou region, in which the fetus would be at risk for β thalassemia major or intermedia, Bart’s hydrops fetalis, and Hb H disease, are 25 (95% CI, 15 to 38), 40 (95% CI, 26 to 57), and 15 (95% CI, 8 to 23), respectively.
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Tony S, Daar S, Elshinawy M, Al-Zadjaly S, Al-Khabori M, Wali Y. T2* MRI in regularly transfused children with thalassemia intermedia: serum ferritin does not reflect liver iron stores. Pediatr Hematol Oncol 2012; 29:579-84. [PMID: 22839111 DOI: 10.3109/08880018.2012.708891] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Nontransfused patients with thalassemia intermedia (TI) accumulate iron due to increased gastrointestinal absorption of iron. Recent studies using T2* MRI revealed that serum ferritin does not reflect the severity of iron overload in nontransfused TI patients. We evaluated the iron overload status in TI children on monthly transfusion. Based on serum ferritin levels, 11 such patients (mean age 13.18 ± 4.09 years), were classified into two groups, group 1 (six patients) and group 2 (five patients) with serum ferritin levels below and above 1000 ng/mL, respectively. T2* MRI assessments were done for evaluation of hepatic and cardiac iron status. Group 1 and group 2 had mean serum ferritin levels of 817.300 ± 244.690 ng/mL and 1983.80 ± 662.862 ng/mL, respectively (P = .003). T2* MRI showed comparable moderate to severe hepatic iron overload status in both. None of the patients had myocardial iron deposition. We conclude that serum ferritin does not reflect the hepatic iron overload status in our patients with TI on regular transfusion.
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Affiliation(s)
- Surekha Tony
- Department of Child Health, Sultan Qaboos University Hospital, Muscat, Oman
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Abstract
Hemoglobin disorders consist of two different groups, the structural hemoglobin variants and the thalassemias. The structural hemoglobin variants typically are based on the point mutations in the alpha- or beta-globin chain that results in a single-amino acid substitution in the corresponding globin chain, whereas thalassemias are caused by quantitative reduction in globin chain synthesis. Various techniques are applied for the laboratory investigation of these diseases, among them mass spectrometry (MS) for the detection and identification of structural hemoglobin variants and array techniques for the thalassemias. In this review, we present in the first part the most important mass spectrometric techniques applied in hemoglobin variant detection and identification and discuss several important aspects of this analysis technique in hematology. In the second part, the DNA analysis techniques used in hemoglobin analysis, such as reverse hybridization or microarray-based comparative genomic hybridization (CGH) techniques, are briefly discussed.
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Affiliation(s)
- Heinz Troxler
- Division of Clinical Chemistry and Biochemistry, University Children's Hospital Zurich, Zurich, Switzerland
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Phylipsen M, Chaibunruang A, Vogelaar IP, Balak JRA, Schaap RAC, Ariyurek Y, Fucharoen S, den Dunnen JT, Giordano PC, Bakker E, Harteveld CL. Fine-tiling array CGH to improve diagnostics for α- and β-thalassemia rearrangements. Hum Mutat 2011; 33:272-80. [PMID: 21922597 DOI: 10.1002/humu.21612] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Accepted: 08/26/2011] [Indexed: 12/21/2022]
Abstract
Implementation of multiplex ligation-dependent probe amplification (MLPA) for thalassemia causing deletions has lead to the detection of new rearrangements. Knowledge of the exact breakpoint sequences should give more insight into the molecular mechanisms underlying these rearrangements, and would facilitate the design of gap-PCRs. We have designed a custom fine-tiling array with oligonucleotides covering the complete globin gene clusters. We hybridized 27 DNA samples containing newly identified deletions and nine positive controls. We designed specific primers to amplify relatively short fragments containing the breakpoint sequence and analyzed these by direct sequencing. Results from nine positive controls showed that array comparative genomic hybridization (aCGH) is suitable to detect small and large rearrangements. We were able to locate all breakpoints to a region of approximately 2 kb. We designed breakpoint primers for 22 cases and amplification was successful in 19 cases. For 12 of these, the exact locations of the breakpoints were determined. Seven of these deletions have not been reported before. aCGH is a valuable tool for high-resolution breakpoint characterization. The combination of MLPA and aCGH has lead to relatively cheap and easy to perform PCR assays, which might be of use for laboratories as an alternative for MLPA in populations where only a limited number of specific deletions occur with high frequency.
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Affiliation(s)
- Marion Phylipsen
- Hemoglobinopathies Laboratory, Center for Human and Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands.
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Wali Y, Zadjali SA, Elshinawy M, Beshlawi I, Fawaz N, AlKindi S, Rawas A, Alsinani S, Daar S, Krishnamoorthy R. Severity ranking of non-deletional alpha thalassemic alleles: insights from an Omani family study. Eur J Haematol 2011; 86:507-11. [DOI: 10.1111/j.1600-0609.2011.01606.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lou JW, Li Q, Wei XF, Huang JW, Xu XM. Identification of the Linkage of a 1.357 KB β-Globin Gene Deletion and A γ-Globin Gene Triplication in a Chinese Family. Hemoglobin 2010; 34:343-53. [DOI: 10.3109/03630269.2010.486357] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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