1
|
Liang L, Xiao Y, Guo W, Xie T, Zheng L, Li Y. Identification of double heterozygous -α 4.2Ⅰ/-α 4.2Ⅱ using third-generation sequencing. Hematology 2023; 28:2250646. [PMID: 37615562 DOI: 10.1080/16078454.2023.2250646] [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: 06/19/2023] [Accepted: 08/17/2023] [Indexed: 08/25/2023] Open
Abstract
OBJECTIVE The 4.2 kb deletion (-α4.2/) is a common a+-thalassemia with a carrier rate, followed by the South-East Asian deletion (-SEA) and the 3.7 kb deletion (-α3.7/). There are few reports about 4.2 kb deletion sub-types. Herein, we present a patient with double heterozygous -α4.2Ⅰ/-α4.2Ⅱwho was identified using third-generation sequencing (TGS). METHODS Hematology and hemoglobin fraction analysis were carried out by complete blood count (CBC) and capillary electrophoresis (CE). Gap-PCR was used to detect the common deletional α-thalassemia, and multiple ligation-dependent probe amplification (MLPA) was performed to screen the large deletion. Sanger sequencing identified the variant. The different deletions were confirmed by TGS. RESULTS CBC showed the patient with microcytic hypochromic anemia, and CE indicated the presence of a Hb variant. Gap-PCR and MLPA detected 4.2 kb deletion homozygotes (-α4.2/-α4.2). The Hb variant was confirmed as Hb Q-Thailand by Sanger sequencing. The patient was identified as compound heterozygous of 4.2 kb deletion and Hb Q-Thailand (-α4.2/-α4.2-Q-Thailand, -α4.2Ⅰ/-α4.2Ⅱ) using TGS. CONCLUSIONS Hb Q-Thailand (-α4.2-Q-Thailand/) complex 4.2 kb deletion heterozygote (-α4.2/) is easily misdiagnosed as 4.2 kb homozygous using Gap-PCR and MLPA. The TGS enables the identification of the two different 4.2 kb deletion sub-types.
Collapse
Affiliation(s)
- Liang Liang
- Center for Medical Genetics and Prenatal Diagnosis, People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Yongjun Xiao
- Department of clinical laboratory, The Second Nanning People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Weilin Guo
- Yaneng Biotechnology Corporation, Shenzhen, People's Republic of China
| | - Tiantian Xie
- Berry Genomics Corporation, Beijing, People's Republic of China
| | - Lihong Zheng
- Center for Medical Genetics and Prenatal Diagnosis, People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Youqiong Li
- Center for Medical Genetics and Prenatal Diagnosis, People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| |
Collapse
|
2
|
Ho SSY, Chong SS, Koay ESC, Chan YH, Sukumar P, Chiu LL, Wang W, Roy A, Rauff M, Su LL, Biswas A, Choolani M. Microsatellite Markers within —SEA Breakpoints for Prenatal Diagnosis of HbBarts Hydrops Fetalis. Clin Chem 2007; 53:173-9. [PMID: 17158194 DOI: 10.1373/clinchem.2006.075085] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
Background: We sought to develop a rapid prenatal diagnostic test for simultaneous detection of HbBarts hydrops fetalis and exclusion of maternal contamination.
Methods: We developed a multiplex quantitative fluorescent PCR (QF-PCR) test that detects the presence/ absence of 2 microsatellite markers (16PTEL05/16PTEL06) located within breakpoints of the Southeast Asia (—SEA) deletion. HbBarts hydrops fetalis (—SEA/—SEA) is diagnosed by absence of both markers, and maternal contamination of fetal DNA is excluded by absence of noninherited maternal alleles. Fetal and parental DNA samples from 50 families were analyzed in a blinded clinical validation study, and QF-PCR results were compared with their respective molecular genotypes.
Results: The multiplex QF-PCR results included correct diagnoses of HbBarts hydrops fetalis in 11 of the fetuses tested, correct verification as unaffected in 20 fetuses, and correct identification as either carriers (αα/—SEA) or unaffected homozygotes in 18. Misidentification as unaffected occurred for 1 carrier. Sensitivity for diagnosis of HbBarts hydrops fetalis was 100% [lower 95% confidence interval, 76.2%], and specificity was 100% (lower 95% confidence interval, 92.6%). None of the samples tested showed any traces of noninherited maternal alleles; thus false-positives because of maternal contamination were eliminated.
Conclusions: In this QF-PCR method, detection of maternally and paternally inherited fetal alleles allowed diagnosis of the double-deletion syndrome, and the ability to differentiate between these alleles allowed simultaneous exclusion of maternal contamination of the fetal genetic material. This novel strategy using cell-free fetal DNA in maternal plasma could form the basis for noninvasive testing for HbBarts hydrops fetalis.
Collapse
Affiliation(s)
- Sherry Sze Yee Ho
- Department of Obstetrics & Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
3
|
Cheng ML, Ho HY, Tseng HC, Lee CH, Shih LY, Chiu DTY. Antioxidant deficit and enhanced susceptibility to oxidative damage in individuals with different forms ofα-thalassaemia. Br J Haematol 2005; 128:119-27. [PMID: 15606558 DOI: 10.1111/j.1365-2141.2004.05257.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
alpha-Thalassaemia is a common red cell disorder in Taiwan, affecting 6-8% of Taiwanese. Previous studies have shown that reactive oxygen species are generated in increased amounts in thalassaemic red cells. This implies the possible alteration of redox status in thalassaemic patients, which may adversely affect their health. In the present study, the redox status of patients with alpha-thalassaemia trait and haemoglobin H (Hb H) disease was investigated. Lipid peroxidation, as measured by the level of plasma thiobarbituric acid reactive substances (TBARS), was increased in alpha-thalassaemic patients, with the highest level of TBARS in Hb H disease patient. The plasma levels of vitamin A, C, and E were significantly lower in alpha-thalassaemic patients than in controls. The overall antioxidant capacity in plasma was inversely correlated with the severity of alpha-globin gene defect: the more severe the form of alpha-thalassaemia, the lower the overall antioxidant capacity in plasma. Erythrocytes isolated from alpha-thalassaemia patients had lower levels of vitamin E, glutathione, catalase and superoxide dismutase. In addition, these alpha-thalassaemic red cells were more susceptible to hydrogen peroxide-induced lipid peroxidation and decrease in deformability. All these data suggest that the alpha-thalassaemic patients suffer from increased oxidative stress and antioxidant deficit, which may complicate the pathophysiology of alpha-thalassaemia.
Collapse
Affiliation(s)
- Mei-Ling Cheng
- Graduate Institute of Medical Biotechnology & Department of Medical Biotechnology and Laboratory Science, Chang Gung University, Kwei-san, Tao-yuan, Taiwan
| | | | | | | | | | | |
Collapse
|
4
|
Shih MC, Peng CT, Chang JG. Association of Hb G-Chinese [alpha30(B11)Glu --> Gln] with alpha-thalassemia-1 of the Thai type in a Taiwanese family. Hemoglobin 2003; 27:41-4. [PMID: 12603093 DOI: 10.1081/hem-120018435] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Mu-Chin Shih
- Department of Laboratory Medicine, China Medical College Hospital, Taichung, Taiwan
| | | | | |
Collapse
|
5
|
Bergstrome JAK, Poon A. Evaluation of a single-tube multiplex polymerase chain reaction screen for detection of common alpha-thalassemia genotypes in a clinical laboratory. Am J Clin Pathol 2002; 118:18-24. [PMID: 12109851 DOI: 10.1309/3vk2-ucj1-5gbj-qv8q] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
We prospectively compared a single-tube multiplex polymerase chain reaction (PCR) for detecting alpha-thalassemia with our current approach using 452 blood samples. Initial evaluation of 89 specimens revealed sensitivity and specificity, respectively, for the hemoglobin H inclusion body test (HbH prep) vs PCR for detecting alpha0-thalassemia carriers of 0.79 and 0.96 and for a mean corpuscular volume (MCV) of 82 microm3 (82 fL) or less, 1.0 and 0.45. Detection of all alpha-thalassemia genotypes was significantly lower for HbH prep and MCV (sensitivity and specificity, respectively: HbH prep, 0.48 and 0.96; MCV, 0.87 and 0.47). In a follow-up evaluation of patients with positive HbH prep results or suspected alpha-thalassemia prescreened by low MCV, the sensitivity and specificity, respectively, of HbH prep vs PCR increased to 0.97 and 0.93 for alpha0-thalassemia and 0.83 and 0.92 for any alpha-thalassemia. PCR detected alpha-thalassemia in 37.2% of 298 suspected alpha-thalassemia cases with suggestive indices but negative HbH prep results and no detectable hemoglobinopathy. This multiplex approach was more sensitive than the HbH prep for detecting all alpha-thalassemia genotypes, particularly alpha+-thalassemia; was particularly valuable for identifying carriers of alpha0-thalassemia at risk for offspring with hemoglobin Bart hydropsfetalis, regardless of other diagnosed hemoglobinopathies; and is an ideal adjunct to standard clinical screening protocols for detecting alpha-globin deletions.
Collapse
|
6
|
Chen TP, Liu TC, Chang CS, Chang JG, Tsai HJ, Lin SF. PCR-based analysis of alpha-thalassemia in Southern Taiwan. Int J Hematol 2002; 75:277-80. [PMID: 11999355 DOI: 10.1007/bf02982041] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The Southeast Asia type deletion of alpha-thalassemia-1 (--SEA) is the most common type of alpha-thalassemia-1 in Taiwan. There are 2 less common types, Filipino type (--FIL) and Thai type (--THAI). In the current study, we screened 754 cases of alpha-thalassemia-1 in Southern Taiwan using a polymerase chain reaction (PCR)-based method. Our results show that the prevalence of the (--SEA) type is 90.6%, followed by the (--FIL) type (8.6%), the (--THAI) type (0.5%), and the (-alpha(3.7/-alpha(3.7)) type (0.3%). We also analyzed the genotypes of 96 patients with hemoglobin (Hb) H disease and 48 cases of hydrops fetalis with Hb Bart's. The frequencies of the genotypes of the alpha-thalassemia-1 allele in Hb H disease are in accordance with the results of analyses of alpha-thalassemia-1 cases. The alpha-thalassemia-2 allele includes alpha(4.2), alpha(G), alpha(CS), and alpha(QS)alpha. Forty-one cases, 6 cases, and 1 case of hydrops fetalis with Hb Bart's were caused by --SEA/--SEA, --SEA/--FIL and --SEA/--THAI respectively. The genotypes and frequencies of alpha-thalassemia in this study are different from those in previous studies in Taiwan and Hong Kong. These differences may be attributed to the diverse genetic origin among different ethnic groups and the extensive inclusion of the (--FIL) and (--THAI) alpha-thalassemia-1 types.
Collapse
Affiliation(s)
- Tyen-Po Chen
- Department of Internal Medicine, Kaohsiung Medical University Hospital, Taiwan
| | | | | | | | | | | |
Collapse
|
7
|
Abstract
Abstract
-Thalassemia is very common throughout all tropical and subtropical regions of the world. In Southeast Asia and the Mediterranean regions, compound heterozygotes and homozygotes may have anemia that is mild to severe (hemoglobin [Hb] H disease) or lethal (Hb Bart's hydrops fetalis). We have developed a reliable, single-tube multiplex–polymerase chain reaction (PCR) assay for the 6 most frequently observed determinants of -thalassemia. The assay allows simple, high throughput genetic screening for these common hematological disorders. (Blood. 2000;95:360-362)
Collapse
|
8
|
Abstract
-Thalassemia is very common throughout all tropical and subtropical regions of the world. In Southeast Asia and the Mediterranean regions, compound heterozygotes and homozygotes may have anemia that is mild to severe (hemoglobin [Hb] H disease) or lethal (Hb Bart's hydrops fetalis). We have developed a reliable, single-tube multiplex–polymerase chain reaction (PCR) assay for the 6 most frequently observed determinants of -thalassemia. The assay allows simple, high throughput genetic screening for these common hematological disorders. (Blood. 2000;95:360-362)
Collapse
|
9
|
Oron-Karni V, Filon D, Oppenheim A, Rund D. Rapid detection of the common Mediterranean alpha-globin deletions/rearrangements using PCR. Am J Hematol 1998; 58:306-10. [PMID: 9692395 DOI: 10.1002/(sici)1096-8652(199808)58:4<306::aid-ajh10>3.0.co;2-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The most frequent molecular lesions causing alpha-thalassemia are deletions of one or more alpha-globin genes. Detection of these deletions generally requires genomic Southern analysis, which is cumbersome and time consuming. We have designed new sets of primers for PCR identification of the common Mediterranean alpha-globin gene rearrangements, including the -alpha3.7 deletion and the alphaalphaalpha(anti3.7) triplication, the -alpha4.2 deletion, and the --Med allele. We have established reaction conditions that provide easily interpretable, unambiguous diagnoses. Some of the PCR reactions are multiplex, simultaneously identifying several genotypes, thus reducing the time and cost of screening and prenatal testing. The use of these methods should facilitate carrier screening and identification of couples at risk for alpha-thalassemia.
Collapse
Affiliation(s)
- V Oron-Karni
- Hematology Department, Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | | | | | | |
Collapse
|
10
|
Chang JG, Jong YJ, Wang WP, Wang JC, Hu CJ, Lo MC, Chang CP. Rapid detection of a recombinant hotspot associated with Charcot–Marie–Tooth disease type 1A duplication by a PCR-based DNA test. Clin Chem 1998. [DOI: 10.1093/clinchem/44.2.270] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A 1.5-Mb duplication on chromosome 17p11.2-p12 (CMT1A duplication) caused by a misalignment of the CMT1A repeat sequences (CMT1A-REPs) is associated with Charcot–Marie–Tooth disease type 1A (CMT1A). A hotspot of crossover breakpoints located in a 3.2-kb region of the CMT1A-REPs accounts for three-quarters of the rearrangements in CMT1A patients. We developed a PCR-based diagnostic method to detect a recombination hotspot associated with the CMT1A duplication. Thirty-one CMT1A Chinese patients from different families and 50 healthy people over 65 years of age were studied. Twenty-seven of the 31 cases demonstrated the 3.2-kb hotspot crossover, of which there were two subgroups. The type 1 crossover breakpoint was located at the distal CMT1A-REP around the PmeI site, and accounted for 24 of the 27 cases with a 3.2-kb hotspot crossover in CMT1A duplication patients. The type 2 crossover breakpoint was located at the distal CMT1A-REP around the base 3625 region, accounting for 3 of the 27 cases. The results correlated very well with the results of Southern transfer analysis. This study has a potentially important role in the diagnosis of CMT1A disease.
Collapse
Affiliation(s)
- Jan-Gowth Chang
- Division of Molecular Medicine, Department of Medical Research, Mackay Memorial Hospital, 92, Sec. 2, Chung Shan N. RD., Taipei, Taiwan
- Molecular Medicine, Taipei Municipal Jen-Ai Hospital, Taipei, Taiwan
| | - Yuh-Jyh Jong
- Division of Pediatric Neurology, Kaohsiung Medical College, Kaohsiung, Taiwan
| | - Wen-Pin Wang
- Department of Molecular Biology, Tzu-Chi College of Medicine, Hualien, Taiwan
| | - Jyh-Chwan Wang
- Division of Molecular Medicine, Department of Medical Research, Mackay Memorial Hospital, 92, Sec. 2, Chung Shan N. RD., Taipei, Taiwan
- Molecular Medicine, Taipei Municipal Jen-Ai Hospital, Taipei, Taiwan
| | - Chaur-Jong Hu
- Departments of Neurology, Taipei Municipal Jen-Ai Hospital, Taipei, Taiwan
| | - Man-Chi Lo
- Department of Neurology, Changhua Christian Hospital, Changhua, Taiwan
| | - Chih-Peng Chang
- Molecular Medicine, Taipei Municipal Jen-Ai Hospital, Taipei, Taiwan
| |
Collapse
|