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Pan L, Wang Y, Lin H, Zhang X, Zhang R. A Novel Frameshift Mutation( HBA2:C.337delC) Associated With α-Thalassemia Trait Detected by Next-Generation Sequencing in Southern China. Hemoglobin 2024:1-3. [PMID: 38653553 DOI: 10.1080/03630269.2024.2344786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Accepted: 04/14/2024] [Indexed: 04/25/2024]
Abstract
Here, we report a novel frameshift mutation caused by a single base deletion in exon 3 of the HBA2 gene (HBA2:c.337delC) detected by next-generation sequencing. The proband was a 26-year-old Chinese pregnant woman who originates from Hunan Province. Her mean corpuscular volume(MCV) and mean corpuscular hemoglobin (MCH) had a mild decrease. Capillary electrophoresis (CE) showed that both Hb A (97.8%) and Hb F (0.0%) values were within normal range, while the Hb A2 (2.2%) value was below normal. Sequence analysis of the α and β-globin genes revealed a novel single base deletion at codon 112 (HBA2:c.337delC) in the heterozygous state, which resulted in a mild phenotype of α-thalassemia.
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Affiliation(s)
| | - Yan Wang
- Department of Medical Genetics and Prenatal Diagnosis, Baoan Women's and Children's Hospital, Shenzhen, China
| | - Haiying Lin
- Department of Medical Genetics and Prenatal Diagnosis, Baoan Women's and Children's Hospital, Shenzhen, China
| | - Xiufa Zhang
- Department of Medical Genetics and Prenatal Diagnosis, Baoan Women's and Children's Hospital, Shenzhen, China
| | - Rui Zhang
- Department of Medical Genetics and Prenatal Diagnosis, Baoan Women's and Children's Hospital, Shenzhen, China
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Li L, Yi H, Liu Z, Long P, Pan T, Huang Y, Li Y, Li Q, Ma Y. Genetic correction of concurrent α- and β-thalassemia patient-derived pluripotent stem cells by the CRISPR-Cas9 technology. Stem Cell Res Ther 2022; 13:102. [PMID: 35255977 PMCID: PMC8900422 DOI: 10.1186/s13287-022-02768-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 02/15/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Thalassemia is a genetic blood disorder characterized by decreased hemoglobin production. Severe anemia can damage organs and severe threat to life safety. Allogeneic transplantation of bone marrow-derived hematopoietic stem cell (HSCs) at present represents a promising therapeutic approach for thalassemia. However, immune rejection and lack of HLA-matched donors limited its clinical application. In recent years, human-induced pluripotent stem cells (hiPSCs) technology offers prospects for autologous cell-based therapy since it could avoid the immunological problems mentioned above. METHODS In the present study, we established a new hiPSCs line derived from amniotic cells of a fetus with a homozygous β41-42 (TCTT) deletion mutation in the HBB gene and a heterozygous Westmead mutation (C > G) in the HBA2 gene. We designed a CRISPR-Cas9 to target these casual mutations and corrected them. Gene-corrected off-target analysis was performed by whole-exome capture sequencing. The corrected hiPSCs were analyzed by teratoma formation and erythroblasts differentiation assays. RESULTS These mutations were corrected with linearized donor DNA through CRISPR/Cas9-mediated homology-directed repair. Corrections of hiPSCs were validated by sequences. The corrected hiPSCs retain normal pluripotency. Moreover, they could be differentiated into hematopoietic progenitors, which proves that they maintain the multilineage differentiation potential. CONCLUSIONS We designed sgRNAs and demonstrated that these sgRNAs facilitating the CRISPR-Cas9 genomic editing system could be applied to correct concurrent α- and β-thalassemia in patient-derived hiPSCs. In the future, these corrected hiPSCs can be applied for autologous transplantation in patients with concurrent α- and β-thalassemia.
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Affiliation(s)
- Lingli Li
- Hainan Provincial Key Laboratory for Human Reproductive Medicine and Genetic Research, Reproductive Medical Center, International Technology Cooperation Base "China-Myanmar Joint Research Center for Prevention and Treatment of Regional Major Disease" By the Ministry of Science and Technology of China, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, 3 Longhua Road, Haikou, 570102, Hainan, China.,Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Medical University, Haikou, Hainan, China.,Hainan Provincial Clinical Research Center for Thalassemia, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, Haikou, Hainan, China
| | - Hongyan Yi
- Hainan Provincial Key Laboratory for Human Reproductive Medicine and Genetic Research, Reproductive Medical Center, International Technology Cooperation Base "China-Myanmar Joint Research Center for Prevention and Treatment of Regional Major Disease" By the Ministry of Science and Technology of China, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, 3 Longhua Road, Haikou, 570102, Hainan, China.,Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Medical University, Haikou, Hainan, China.,Hainan Provincial Clinical Research Center for Thalassemia, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, Haikou, Hainan, China
| | - Zheng Liu
- College of Medical Laboratory Science, Guilin Medical University, Guilin, Guangxi, China
| | - Ping Long
- Hainan Provincial Key Laboratory for Human Reproductive Medicine and Genetic Research, Reproductive Medical Center, International Technology Cooperation Base "China-Myanmar Joint Research Center for Prevention and Treatment of Regional Major Disease" By the Ministry of Science and Technology of China, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, 3 Longhua Road, Haikou, 570102, Hainan, China.,Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Medical University, Haikou, Hainan, China.,Hainan Provincial Clinical Research Center for Thalassemia, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, Haikou, Hainan, China
| | - Tao Pan
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Medical University, Haikou, Hainan, China.,College of Biomedical Information and Engineering, Hainan Medical University, Haikou, 571199, China
| | - Yuanhua Huang
- Hainan Provincial Key Laboratory for Human Reproductive Medicine and Genetic Research, Reproductive Medical Center, International Technology Cooperation Base "China-Myanmar Joint Research Center for Prevention and Treatment of Regional Major Disease" By the Ministry of Science and Technology of China, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, 3 Longhua Road, Haikou, 570102, Hainan, China.,Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Medical University, Haikou, Hainan, China.,Hainan Provincial Clinical Research Center for Thalassemia, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, Haikou, Hainan, China
| | - Yongsheng Li
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Medical University, Haikou, Hainan, China. .,College of Biomedical Information and Engineering, Hainan Medical University, Haikou, 571199, China.
| | - Qi Li
- Hainan Provincial Key Laboratory for Human Reproductive Medicine and Genetic Research, Reproductive Medical Center, International Technology Cooperation Base "China-Myanmar Joint Research Center for Prevention and Treatment of Regional Major Disease" By the Ministry of Science and Technology of China, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, 3 Longhua Road, Haikou, 570102, Hainan, China. .,Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Medical University, Haikou, Hainan, China. .,Hainan Provincial Clinical Research Center for Thalassemia, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, Haikou, Hainan, China.
| | - Yanlin Ma
- Hainan Provincial Key Laboratory for Human Reproductive Medicine and Genetic Research, Reproductive Medical Center, International Technology Cooperation Base "China-Myanmar Joint Research Center for Prevention and Treatment of Regional Major Disease" By the Ministry of Science and Technology of China, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, 3 Longhua Road, Haikou, 570102, Hainan, China. .,Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Medical University, Haikou, Hainan, China. .,Hainan Provincial Clinical Research Center for Thalassemia, The First Affiliated Hospital of Hainan Medical University, Hainan Medical University, Haikou, Hainan, China.
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Tian Q, Lei YL, Xu LL, Li DZ. First Report of Nondeletional Hb H Disease Caused by an α2-Globin Gene Mutation: HBA2: c.184A>T. Hemoglobin 2021; 45:210-211. [PMID: 34039242 DOI: 10.1080/03630269.2021.1930553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
We report a rare mutation, HBA2: c.184A>T on the α2-globin gene, detected in a Chinese proband who presented with Hb H disease and a mild anemia. This frameshift mutation results in a premature termination of translation at position 61 of the α2-globin gene. Carriers of this mutation showed a borderline microcytic hypochromia. Our study indicates the importance of screening nondeletional α-thalassemia (α-thal) in areas with a particularly high prevalence of thalassemia such as in Southern China, especially for couples with one partner carrying an α0-thal deletion.
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Affiliation(s)
- Qi Tian
- Prenatal Diagnosis Unit, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong Province, People's Republic of China
| | - Ya-Li Lei
- Clinical Laboratory, Dongguan Kanghua Hospital, Dongguan, Guangdong Province, People's Republic of China
| | - Li-Li Xu
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou, Guangdong Province, People's Republic of China
| | - Dong-Zhi Li
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou, Guangdong Province, People's Republic of China
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Ropero P, Arbeteta J, Nieto JM, González FA, González B, Villegas A, Benavente C. Nondeletional α-Thalassemia: Two New Mutations on the α2 Gene. Hemoglobin 2020; 44:17-19. [PMID: 32000548 DOI: 10.1080/03630269.2020.1721020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
About 10.0% of α-thalassemia (α-thal) cases are due to point mutations, small deletions, or insertions of one or more bases on the α genes that can alter mRNA processing at the transcription, translation, or post-translation level; these cases are called nondeletional α-thalassemias (α-thal). Most occur within the domain of the α2 gene without changes in the expression of the α1 gene. We present two new frameshift mutations on the HBA2 gene, associated with a nondeletional α-thal phenotype. The probands were referred to our clinic because of persistent microcytosis and hypochromia. The molecular characterization was performed by automatic sequencing of the α-globin genes. Two new mutations were detected on the HBA2 gene; HBA2: c.85delG, p.(Ala29fs*21), and HBA2: c.268_280delCACAAGCTTCGGG, p.(His90Trpfs*9). These new mutations cause a change of the reading frame, the first on codon 28 and the second from codons 89 to 93. In the first mutation, the result is an altered amino acid sequence and a premature termination codon at position 87, while the elimination of 13 bp generates a protein of 95 residues and in this case, the premature termination codon is at position 96. These types of mutation are among the most damaging changes to the coding of a protein. Not only do they lead to changes in the length of the polypeptide, but they also vary the chemical composition, which would result in a nonfunctional protein. The importance of identifying these new mutations lies in their possible association with α0-thal, which could lead to a severe thalassemia.
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Affiliation(s)
- Paloma Ropero
- Servicio de Hematología, Hospital Clínico San Carlos de Madrid, Madrid, Spain.,Instituto de Investigación Sanitaria, Hospital Clínico San Carlos de Madrid, Madrid, Spain
| | - Jaime Arbeteta
- Servicio de Hematología, Hospital Universitario de Guadalajara, Guadalajara, Spain
| | - Jorge M Nieto
- Servicio de Hematología, Hospital Clínico San Carlos de Madrid, Madrid, Spain.,Instituto de Investigación Sanitaria, Hospital Clínico San Carlos de Madrid, Madrid, Spain
| | - Fernando A González
- Servicio de Hematología, Hospital Clínico San Carlos de Madrid, Madrid, Spain
| | - Beatriz González
- Servicio de Hematología, Hospital Clínico San Carlos de Madrid, Madrid, Spain.,Instituto de Investigación Sanitaria, Hospital Clínico San Carlos de Madrid, Madrid, Spain
| | - Ana Villegas
- Servicio de Hematología, Hospital Clínico San Carlos de Madrid, Madrid, Spain
| | - Celina Benavente
- Servicio de Hematología, Hospital Clínico San Carlos de Madrid, Madrid, Spain
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Borgio JF, AbdulAzeez S, Al-Muslami AM, Naserullah ZA, Al-Jarrash S, Al-Suliman AM, Al-Madan MS, Al-Ali AK. KLF1 gene and borderline hemoglobin A 2 in Saudi population. Arch Med Sci 2018; 14:230-236. [PMID: 29379553 PMCID: PMC5778434 DOI: 10.5114/aoms.2018.72245] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 06/29/2017] [Indexed: 02/02/2023] Open
Abstract
INTRODUCTION Elevated HbA2 (hemoglobin A2) level is considered the most reliable hematological parameter for the detection of β-thalassemia carriers. However, some carriers are difficult to recognize because the level of HbA2 is not in the distinctive carrier range, i.e. 4.0-6.0%; instead, some carriers have HbA2 levels between normal and carrier levels, i.e. borderline HbA2 (HbA2 = 3.1-3.9%). Studies have shown that variations in the erythroid Krüppel-like factor (KLF1) gene lead to borderline HbA2 in β-thalassemia carriers from various populations. The incidence of borderline HbA2 in Saudis is high. MATERIAL AND METHODS To confirm the influence of variations in KLF1, HBA1, HBA2 and HBB genes for the reduction of the level of HbA2 in Saudi β-thalassemia carriers, we performed a direct sequence analysis of KLF1, HBA1, HBA2 and HBB genes from 212 healthy Saudis (88 subjects: HbA2 < 3; 72 subjects: HbA2 = 3.1 to 3.9; 52 subjects HbA2 > 4.3). RESULTS The presence of the borderline HbA2 level is not specific to any type of β-thalassemia variation or β+-thalassemia variations in Saudis. Two exonic (c.304T>C and c.544T>C) and two 3' untranslated region (3'UTR) (c.*296G>A and c.*277C>G) variations have been identified in the KLF1 gene for the first time from an Arab population. None of these four variations in KLF1 genes are significantly associated with the Saudis with borderline HbA2. α Globin genotype, -α23.7/α1α2, is found to be the most frequent (55.55%) among healthy Saudis with borderline HbA2 compared with the other groups (HbA2 < 3 = 20.45%; HbA2 > 4.3 = 13.51%). CONCLUSIONS Further studies are necessary to determine the influence of other factors on the presence of borderline HbA2 in 41.67% of Saudis.
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Affiliation(s)
- J. Francis Borgio
- Department of Genetic Research, Institute for Research and Medical Consultation (IRMC), University of Dammam, Dammam, Saudi Arabia
| | - Sayed AbdulAzeez
- Department of Genetic Research, Institute for Research and Medical Consultation (IRMC), University of Dammam, Dammam, Saudi Arabia
| | - Ahmed M. Al-Muslami
- Department of Genetic Research, Institute for Research and Medical Consultation (IRMC), University of Dammam, Dammam, Saudi Arabia
| | | | | | - Ahmed M. Al-Suliman
- Al-Omran Scientific Chair for Hematological Diseases Prevalent in the Al-Ahssa Area, King Faisal University, Al-Ahssa, Saudi Arabia
| | - Mohammed S. Al-Madan
- Department of Pediatrics, King Fahd Hospital of the University, Al-Khobar, Saudi Arabia
| | - Amein K. Al-Ali
- Department of Biochemistry, University of Dammam, Dammam, Saudi Arabia
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Sepúlveda N, Manjurano A, Drakeley C, Clark TG. On the performance of multiple imputation based on chained equations in tackling missing data of the African α3.7 -globin deletion in a malaria association study. Ann Hum Genet 2015; 78:277-89. [PMID: 24942080 PMCID: PMC4140543 DOI: 10.1111/ahg.12065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 03/23/2014] [Indexed: 11/30/2022]
Abstract
Multiple imputation based on chained equations (MICE) is an alternative missing genotype method that can use genetic and nongenetic auxiliary data to inform the imputation process. Previously, MICE was successfully tested on strongly linked genetic data. We have now tested it on data of the HBA2 gene which, by the experimental design used in a malaria association study in Tanzania, shows a high missing data percentage and is weakly linked with the remaining genetic markers in the data set. We constructed different imputation models and studied their performance under different missing data conditions. Overall, MICE failed to accurately predict the true genotypes. However, using the best imputation model for the data, we obtained unbiased estimates for the genetic effects, and association signals of the HBA2 gene on malaria positivity. When the whole data set was analyzed with the same imputation model, the association signal increased from 0.80 to 2.70 before and after imputation, respectively. Conversely, postimputation estimates for the genetic effects remained the same in relation to the complete case analysis but showed increased precision. We argue that these postimputation estimates are reasonably unbiased, as a result of a good study design based on matching key socio-environmental factors.
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Affiliation(s)
- Nuno Sepúlveda
- London School of Hygiene and Tropical Medicine, London, UK; Centre of Statistics and Applications of University of Lisbon, Lisbon, Portugal
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