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Su Y, Xie J, He J, Shen Y, Li T, Huang W, Tong X, Bian Q. Screening and treatment of thalassemia. Clin Chim Acta 2025; 570:120211. [PMID: 39993456 DOI: 10.1016/j.cca.2025.120211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2025] [Revised: 02/21/2025] [Accepted: 02/21/2025] [Indexed: 02/26/2025]
Abstract
Thalassemia refers to a collection of inherited conditions that lead to the production of abnormal hemoglobin, resulting from defects in the synthesis of globin chains. Currently, there is no definitive cure for thalassemia; therefore, early screening for thalassemia is the focus of clinical research. In recent years, thalassemia screening technology has been continuously developed, leading to updates in screening methods and significant improvements in accuracy. Genetic testing and hemoglobin electrophoresis are more popular in high-resource areas, effectively reducing the birth rate of children with severe thalassemia. This review summarizes current research on thalassemia screening from the perspectives of premarital, prenatal, and neonatal screening. In addition, the latest research on treatment of thalassemia has been concluded from the induction of fetal hemoglobin to gene therapy.
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Affiliation(s)
- Yue Su
- Clinical Research Institute, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, Zhejiang 310014, China; The Second Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou 310014 Zhejiang, China
| | - Jiahao Xie
- Clinical Research Institute, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, Zhejiang 310014, China; The Second Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou 310014 Zhejiang, China
| | - Junjia He
- Center for Plastic & Reconstructive Surgery, Department of Dermatology, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou 310014 Zhejiang, China
| | - Yeyu Shen
- Center for Plastic & Reconstructive Surgery, Department of Dermatology, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou 310014 Zhejiang, China
| | - Ting Li
- College of Bioengineering, Zhejiang University of Technology, Hangzhou 310014 Zhejiang, China
| | - Weitao Huang
- Clinical Research Institute, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, Zhejiang 310014, China
| | - Xiangmin Tong
- Department of Hematology, Hangzhou First People 's Hospital, Hangzhou 310014 Zhejiang, China.
| | - Qiong Bian
- Clinical Research Institute, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, Zhejiang 310014, China; Center for Plastic & Reconstructive Surgery, Department of Dermatology, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou 310014 Zhejiang, China.
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2
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Kumar R, Chander Y, Verma A, Tripathi BN, Barua S, Kumar N. TA novel HRM-based gap-qRT-PCR for identification and quantitation of the vaccine and field strain(s) of lumpy skin disease virus. J Immunol Methods 2023:113521. [PMID: 37392930 DOI: 10.1016/j.jim.2023.113521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 06/27/2023] [Accepted: 06/28/2023] [Indexed: 07/03/2023]
Abstract
Lumpy skin disease (LSD) has become the most important animal health problem in India due to high morbidity, mortality and production losses. A homologous live-attenuated LSD vaccine (Lumpi-ProVacInd) was recently developed by using a local LSD virus (LSDV) strain (LSDV/2019/India/Ranchi) in India which is likely to replace the existing practice of vaccinating cattle with goatpox vaccine. It is essential to differentiate the vaccine and field strains, if a live-attenuated vaccine has been used for control and eradication of the disease, particularly in endemic areas. As compared to the prevailing vaccine and field/virulent strains, the Indian vaccine strain (Lumpi-ProVacInd) has a unique deletion of 801 nucleotides in its inverted terminal repeat (ITR) region. We exploited this unique feature and developed a novel high resolution melting-based gap quantitative real-time PCR (HRM-gap-qRT-PCR) for rapid identification and quantitation of the vaccine and field strain(s) of LSDV.
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Affiliation(s)
- Ram Kumar
- National Centre for Veterinary Type Cultures, ICAR-National Research Centre on Equines, Hisar, India
| | - Yogesh Chander
- National Centre for Veterinary Type Cultures, ICAR-National Research Centre on Equines, Hisar, India
| | - Assim Verma
- National Centre for Veterinary Type Cultures, ICAR-National Research Centre on Equines, Hisar, India
| | - Bhupendra N Tripathi
- National Centre for Veterinary Type Cultures, ICAR-National Research Centre on Equines, Hisar, India; Animal Science Division, Indian Council of Agricultural Research, New Delhi, India
| | - Sanjay Barua
- National Centre for Veterinary Type Cultures, ICAR-National Research Centre on Equines, Hisar, India
| | - Naveen Kumar
- National Centre for Veterinary Type Cultures, ICAR-National Research Centre on Equines, Hisar, India.
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3
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Ghorbani J, Hashemi FB, Jabalameli F, Emaneini M, Beigverdi R. Multiplex detection of five common respiratory pathogens from bronchoalveolar lavages using high resolution melting curve analysis. BMC Microbiol 2022; 22:141. [PMID: 35590256 PMCID: PMC9118692 DOI: 10.1186/s12866-022-02558-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 05/16/2022] [Indexed: 11/19/2022] Open
Abstract
Background The study describes the application of the multiplex high-resolution melting curve (MHRM) assay for the simultaneous detection of five common bacterial pathogens (Pseudomonas aeruginosa, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii and Escherichia coli) directly from bronchoalveolar lavage samples. Results Our MHRM assay successfully identified all five respiratory pathogens in less than 5 h, with five separate melting curves with specific melt peak temperatures (Tm). The different Tm were characterized by peaks of 78.1 ± 0.4 °C for S. aureus, 83.3 ± 0.1 °C for A. baumannii, 86.7 ± 0.2 °C for E. coli, 90.5 ± 0.1 °C for K. pneumoniae, 94.5 ± 0.2 °C for P. aeruginosa. The overall sensitivity and specificity of MHRM were 100% and 88.8–100%, respectively. Conclusions Our MHRM assay offers a simple and fast alternative to culture approach for simultaneous detection of five major bacterial lower respiratory tract infection pathogens. Utilization of this assay can help clinicians initiate prompt and appropriate antimicrobial treatment, towards reducing the morbidity and mortality of severe respiratory infections. Supplementary Information The online version contains supplementary material available at 10.1186/s12866-022-02558-2.
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Affiliation(s)
- Jaber Ghorbani
- Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Building No. 6, 100 Poursina St., Keshavarz Blvd., Tehran, Iran
| | - Farhad Bonakdar Hashemi
- Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Building No. 6, 100 Poursina St., Keshavarz Blvd., Tehran, Iran
| | - Fereshteh Jabalameli
- Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Building No. 6, 100 Poursina St., Keshavarz Blvd., Tehran, Iran
| | - Mohammad Emaneini
- Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Building No. 6, 100 Poursina St., Keshavarz Blvd., Tehran, Iran.,Medical Mycology and Bacteriology Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Reza Beigverdi
- Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Building No. 6, 100 Poursina St., Keshavarz Blvd., Tehran, Iran. .,Medical Mycology and Bacteriology Research Center, Kerman University of Medical Sciences, Kerman, Iran.
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4
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Vijian D, Wan Ab Rahman WS, Ponnuraj KT, Zulkafli Z, Mohd Noor NH. Molecular Detection of Alpha Thalassemia: A Review of Prevalent Techniques. Medeni Med J 2021; 36:257-269. [PMID: 34915685 PMCID: PMC8565582 DOI: 10.5222/mmj.2021.14603] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 09/07/2021] [Indexed: 12/14/2022] Open
Abstract
Alpha thalassemia (α-thalassemia) is an autosomal recessive disorder due to the reduction or absence of α globin chain production. Laboratory diagnosis of α-thalassemia requires molecular analysis for the confirmatory diagnosis. A screening test, comprising complete blood count, blood smear and hemoglobin quantification by high performance liquid chromatography and capillary electrophoresis, may not possibly detect all the thalassemia diseases. This review focused on the molecular techniques used to detect α-thalassemia, and the advantages and disadvantages of each technique were highlighted. Multiplex gap-polymerase chain reaction, single-tube multiplex polymerase chain reaction, multiplex ligation-dependent probe amplification, and loop-mediated isothermal amplification were used to detect common deletion of α-thalassemia. Furthermore, the reverse dot blot analysis and a single tube multiplex polymerase chain reaction could detect non-deletion mutation of the α-globin gene. Sanger sequencing is widely used to detect non-deletion mutations of α-thalassemia. Recently, next-generation sequencing was introduced in the diagnosis of both deletion and point mutations of α-thalassemia. Despite the advantages and disadvantages of different techniques, the routine method employed in the laboratory should be based on the facility, expertise, available equipment, and economic conditions.
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Affiliation(s)
- Divashini Vijian
- Universiti Sains Malaysia, School of Dental Sciences, Kubang Kerian Kelantan, Malaysia
| | - Wan Suriana Wan Ab Rahman
- Universiti Sains Malaysia, Health campus, School of Dental Sciences, Kubang Kerian, Kelantan, Malaysia
| | | | - Zefarina Zulkafli
- Universiti Sains Malaysia, School of Medical Sciences, Department of Hematology, Kubang Kerian Kelantan, Malaysia
| | - Noor Haslina Mohd Noor
- Universiti Sains Malaysia, School of Medical Sciences, Department of Hematology, Kubang Kerian Kelantan, Malaysia
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Sawakwongpra K, Tangmansakulchai K, Ngonsawan W, Promwan S, Chanchamroen S, Quangkananurug W, Sriswasdi S, Jantarasaengaram S, Ponnikorn S. Droplet-based digital PCR for non-invasive prenatal genetic diagnosis of α and β-thalassemia. Biomed Rep 2021; 15:82. [PMID: 34512970 PMCID: PMC8411484 DOI: 10.3892/br.2021.1458] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 07/15/2021] [Indexed: 12/16/2022] Open
Abstract
Non-invasive prenatal diagnosis (NIPD) of isolated cell-free DNA from maternal plasma has been applied to detect monogenic diseases in the fetus. Droplet digital PCR (ddPCR) is a sensitive and quantitative technique for NIPD. In the present study, the development and evaluation of ddPCR-based assays for common α and β-thalassemia variants amongst the Asian population was described; specifically, Southeast Asian (SEA) deletion, HbE, and 41/42 (-CTTT). SEA is caused by deletion of a 20 kb region surrounding the α-globin gene, whilst HbE and 41/42 (-CTTT) are caused by point mutations on the β-globin gene. Cell-free DNA samples from 46 singleton pregnant women who were carriers of these mutations were isolated and quantified using ddPCR with specially designed probes for each target allele. Allelic copy number calculation and likelihood ratio tests were used to classify fetal genotypes. Classification performances were evaluated against ground truth fetal genotypes obtained from conventional amniocentesis. Copy number variation analysis of SEA deletion accurately classified fetal genotypes in 20 out of 22 cases with an area under the receiver operating characteristic curve of 0.98 for detecting Hb Bart's hydrops fetalis. For HbE cases, 10 out of 16 samples were correctly classified, and three were inconclusive. For 41/42 (-CTTT) cases, 2 out of 8 were correctly classified, and four were inconclusive. The correct genotype was not rejected in any inconclusive case and may be resolved with additional ddPCR experiments. These results indicate that ddPCR-based analysis of maternal plasma can become an accurate and effective NIPD for SEA deletion α-(0) thalassemia. Although the performance of ddPCR on HbE and 41/42 (-CTTT) mutations were not sufficient for clinical application, these results may serve as a foundation for future works in this field.
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Affiliation(s)
- Kritchakorn Sawakwongpra
- Chulabhorn International College of Medicine, Thammasat University, Khlong Luang, Pathum Thani 12120, Thailand
| | | | | | | | - Sujin Chanchamroen
- Next Generation Genomic, Pathum Wan, Bangkok 10330, Thailand.,SAFE Fertility Center, Pathum Wan, Bangkok 10330, Thailand
| | - Wiwat Quangkananurug
- Next Generation Genomic, Pathum Wan, Bangkok 10330, Thailand.,SAFE Fertility Center, Pathum Wan, Bangkok 10330, Thailand
| | - Sira Sriswasdi
- Research Affairs, Faculty of Medicine, Chulalongkorn University, Pathum Wan, Bangkok 10330, Thailand.,Computational Molecular Biology Group, Faculty of Medicine, Chulalongkorn University, Pathum Wan, Bangkok 10330, Thailand
| | - Surasak Jantarasaengaram
- Department of Obstetrics and Gynecology, Rajavithi Hospital, Ratchathewi, Bangkok 10400, Thailand
| | - Saranyoo Ponnikorn
- Chulabhorn International College of Medicine, Thammasat University, Khlong Luang, Pathum Thani 12120, Thailand
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Nuinoon M, Horpet D. Simultaneous Characterization of Deletional and Nondeletional Globin Gene Mutations by Multiplex Real-Time-Polymerase Chain Reaction and High-Resolution Melting Curve Analysis. Hemoglobin 2020; 44:311-318. [PMID: 32783482 DOI: 10.1080/03630269.2020.1799819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Both deletional and nondeletional globin gene mutations are common in Southeast Asians. Normally, deletional gene mutations are characterized separately from nondeletional gene mutations. Therefore, we developed a new approach of multiplex real-time polymerase chain reaction (qPCR) followed by high-resolution melting (HRM) analysis without a fluorescently-labeled probe for the simultaneous detection of deletional and nondeletional gene mutations in a single tube. Three sets of primer pairs were used to establish the qPCR-HRM method that was used to genotype more than 20 different globin genotypes. Twenty known genotypes were used to optimize the qPCR and HRM conditions. Eight genotypes were used to determine the reproducibility of the method. A total of 351 blinded known DNA samples were used for the validation study in three separate reactions and revealed 16 distinct patterns of fragments and/or HRM. The melting temperatures (Tm) of the 3.5 kb, - -THAI, HBB-FR2 (exon 1 of the HBB gene), - -SEA (Southeast Asian), α2 and 3'-ψζ1 fragments were 79.44, 81.01, 86.47, 87.89, 90.54 and 94.15 °C, respectively. The HRM analysis was performed with the HBB-FR2 fragment to differentiate several alleles. We report a rapid and high-throughput technique that showed 100.0% concordance and low variability for each run. Our developed technique is one of the alternative techniques recommended for screening samples with both deletional and nondeletional globin gene mutations.
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Affiliation(s)
- Manit Nuinoon
- School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat, Thailand
| | - Dararat Horpet
- Center for Scientific and Technological Equipment, Walailak University, Nakhon Si Thammarat, Thailand
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7
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Anwar S, Taslem Mourosi J, Hasan MK, Hosen MJ, Miah MF. Umbilical Cord Blood Screening for the Detection of Common Deletional Mutations of α-Thalassemia in Bangladesh. Hemoglobin 2020; 44:201-210. [PMID: 32605390 DOI: 10.1080/03630269.2020.1784755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
α-Thalassemia (α-thal) is assumed to be very prevalent in Bangladesh. We aimed to assess the prevalence of the disease in the country and provide a model for α-thal newborn screening in Bangladesh. We collected umbilical cord blood (UCB) samples from 413 unrelated newborns in Bangladesh. Demographic information, blood indices, osmotic fragility, serum iron (Fe), and zinc (Zn) levels were evaluated for all the subjects. All subjects underwent a polymerase chain reaction (PCR)-based diagnosis for α-thal status, followed by a multiplex gap-PCR-based identification of the deletion type present. Sixty-seven subjects had at least one α-thal deletion (16.22%). We observed that -α3.7 (rightward), - -SEA (Southeast Asian), -α4.2 (leftward), - -MED (Mediterranean) and - -THAI (Thailand) deletions were the most common α-globin deletions present in the country, with the -α3.7 (n = 37) and - -SEA (n = 18) being most prevalent. The osmotic fragility test (OFT) could predict the presence of α-thal deletions with over 98.0% sensitivity. Complete UCB count analysis revealed significant differences between healthy subjects and subjects with α-thal deletions. Although the iron level was almost the same (108.0 vs. 105.7 µg/dL), a reduced level of Zn (98.6 vs. 71.8 µg/dL, p < 0.01) was observed in the cord blood-derived serum of the subjects with α-thal deletions. Moreover, parental age at the time of delivery, gestational period, and birth weight was lower in the subjects with α-thal deletions. This study provides partial information on the epidemiology of α-thal in Bangladesh and describes a model for α-thal newborn screening in the country.
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Affiliation(s)
- Saeed Anwar
- Department of Genetic Engineering and Biotechnology, School of Life Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh
| | - Jarin Taslem Mourosi
- Department of Genetic Engineering and Biotechnology, School of Life Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh
| | - Md Kamrul Hasan
- Department of Biochemistry and Molecular Biology, Tejgaon College, National University of Bangladesh, Gazipur, Bangladesh.,Department of Public Health, School of Health and Life Sciences, North South University, Dhaka, Bangladesh
| | - Mohammad Jakir Hosen
- Department of Genetic Engineering and Biotechnology, School of Life Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh
| | - Md Faruque Miah
- Department of Genetic Engineering and Biotechnology, School of Life Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh
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Ju M, Bai X, Zhang T, Lin Y, Yang L, Zhou H, Chang X, Guan S, Ren X, Li K, Wang Y, Li G. Mutation spectrum of COL1A1/COL1A2 screening by high-resolution melting analysis of Chinese patients with osteogenesis imperfecta. J Bone Miner Metab 2020; 38:188-197. [PMID: 31414283 DOI: 10.1007/s00774-019-01039-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 07/24/2019] [Indexed: 11/30/2022]
Abstract
High-resolution melting (HRM) analysis has been shown to be a time-saving method for the screening of genetic variants. To increase the precision of the diagnosis of osteogenesis imperfecta (OI), we used HRM to explore COL1A1/COL1A2 mutations in 87 Chinese OI patients and to perform population-based studies of the relationships between their genotypes and phenotypes. Peripheral blood samples were collected from the 87 non-consanguineous probands. The coding regions and exon boundaries of COL1A1/COL1A2 were detected by HRM and confirmed by Sanger sequencing. The functional effects of mutations were predicted through bioinformatic tools. Mutations were detected in 70.3% of familial cases and 40% of sporadic cases (p < 0.01). Compared with COL1A1 mutations, patients with COL1A2 mutations were more prone to severe phenotypes. Helical mutations (caused by substitution of the glycine within the Gly-X-Y triplet domain) were more likely to occur in patients with type III and IV (p < 0.05). Haploinsufficiency mutations (caused by frameshift, nonsense, and splice-site mutations) appeared more frequently in patients with type I (p < 0.05). Compared with the Sanger sequencing and whole exome sequencing (WES), HRM was found to reduce total costs by 78%- 80% in patients who had a positive HRM separate melting curve. Our findings suggest that HRM would greatly benefit small and understaffed hospitals and laboratories, and would facilitate the accurate diagnosis and early treatment of OI in remote and less developed regions.
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Affiliation(s)
- Mingyan Ju
- Department of Genetics, Tianjin Medical University, Tianjin, 300070, People's Republic of China
| | - Xue Bai
- Department of Medical Laboratory, Tianjin Hospital, Tianjin, 300000, People's Republic of China
| | - Tianke Zhang
- Colorectal Surgery, Tianjin People's Hospital, Tianjin, 300000, People's Republic of China
| | - Yunshou Lin
- School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, People's Republic of China
| | - Li Yang
- School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, People's Republic of China
| | - Huaiyu Zhou
- School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, People's Republic of China
| | - Xiaoli Chang
- Department of Medical Laboratory, Tianjin Hospital, Tianjin, 300000, People's Republic of China
| | - Shizhen Guan
- Department of Medical Laboratory, Tianjin Hospital, Tianjin, 300000, People's Republic of China
| | - Xiuzhi Ren
- Orthopedic Ward III, Wuqing People's Hospital, Tianjin, 300000, People's Republic of China
| | - Keqiu Li
- Department of Genetics, Tianjin Medical University, Tianjin, 300070, People's Republic of China
| | - Yi Wang
- Department of Medical Laboratory, Tianjin Hospital, Tianjin, 300000, People's Republic of China
| | - Guang Li
- Department of Genetics, Tianjin Medical University, Tianjin, 300070, People's Republic of China.
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Viprakasit V, Ekwattanakit S. Clinical Classification, Screening and Diagnosis for Thalassemia. Hematol Oncol Clin North Am 2018; 32:193-211. [PMID: 29458726 DOI: 10.1016/j.hoc.2017.11.006] [Citation(s) in RCA: 125] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
At present, thalassemia diseases are classified into transfusion-dependent thalassemia and non-transfusion-dependent thalassemia. This classification is based on the clinical severity of patients determining whether they do require regular blood transfusions to survive (transfusion-dependent thalassemia) or not (non-transfusion-dependent thalassemia). In addition to the previous terminology of "thalassemia major" or "thalassemia intermedia," this classification has embraced all other forms of thalassemia syndromes such as α-thalassemia, hemoglobin E/β-thalassemia and combined α- and β-thalassemias. Definitive diagnosis of thalassemia and hemoglobinopathies requires a comprehensive workup from complete blood count, hemoglobin analysis, and molecular studies to identify mutations of globin genes.
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Affiliation(s)
- Vip Viprakasit
- Siriraj Integrated Center of Excellence for Thalassemia (SiiCOE-T) and Division of Hematology/Oncology, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, Siriraj, Bangkoknoi, Bangkok 10700, Thailand.
| | - Supachai Ekwattanakit
- Division of Hematology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, Siriraj, Bangkoknoi, Bangkok 10700, Thailand
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Chomean S, Pholyiam K, Thamwarokun A, Kaset C. Development of Visual Detection of α-Thalassemia-1 (the - - SEA Deletion) Using pH-Sensitive Loop-Mediated Isothermal Amplification. Hemoglobin 2018; 42:171-177. [PMID: 30192689 DOI: 10.1080/03630269.2018.1488723] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Detection of α-thalassemia-1 (α-thal-1) carriers provides valuable insight for genetic consulting in prevention and control programs for couples who are at risk of conceiving a fetus with severe thalassemia, both Hb Bart's hydrops fetalis and hemolytic Hb H disease. The traditional method is complicated, time-consuming and requires high instrument cost and expertise. Loop-mediated isothermal amplification (LAMP) based on pH-sensitive dye technology, shows all the characteristics required of a real-time analysis with simple operation for potential use in the clinical diagnosis of high incidence α-thal-1 [Southeast Asian (SEA) or - -SEA deletion]. Four primers specific for six distinct regions of the α-globin gene deletion were designed and analyzed by LAMP using the pH-indicator dye, phenol red. The amplification of the - -SEA deletion changed the color of phenol red from pink to orange. The diagnostic ability of detection of the - -SEA deletion by pH-sensitive LAMP was validated using both known and unknown blood samples and compared to the conventional polymerase chain reaction (PCR) method. Color inspection of pH-sensitive LAMP products could clearly identify the - -SEA deletion. There was no cross reaction with a normal α-globin gene, α-thal-1 Thai (- -THAI deletion), α-thal-2 [-α3.7 (rightward) and -α4.2 (leftward) deletion] and β-thalassemia (β-thal). Detection of the SEA deletion by pH-sensitive LAMP was consistent as compared to conventional PCR. The pH-sensitive LAMP method developed for this deletion carrier diagnosis has high sensitivity, specificity, simplicity, and requires simple instrumentation that makes it applicable for resource-limited laboratories in rural areas of developing countries.
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Affiliation(s)
- Sirinart Chomean
- a Department of Medical Technology, Faculty of Allied Health Science s, Thammasat University , Klong Luang , Pathum Thani Province , Thailand
| | - Kanokporn Pholyiam
- a Department of Medical Technology, Faculty of Allied Health Science s, Thammasat University , Klong Luang , Pathum Thani Province , Thailand
| | - Areenuch Thamwarokun
- a Department of Medical Technology, Faculty of Allied Health Science s, Thammasat University , Klong Luang , Pathum Thani Province , Thailand
| | - Chollanot Kaset
- a Department of Medical Technology, Faculty of Allied Health Science s, Thammasat University , Klong Luang , Pathum Thani Province , Thailand
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