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Molecular and Haematological Characteristics of alpha-Thalassemia Deletions in Yogyakarta Special Region, Indonesia. Rep Biochem Mol Biol 2022; 10:346-353. [PMID: 34981010 DOI: 10.52547/rbmb.10.3.346] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 05/13/2021] [Indexed: 11/18/2022]
Abstract
Background alpha-Thalassemia is caused primarily by deletions of one to two alpha-globin genes and is characterized by absent or deficient production of alpha-globin protein. The South-East Asia (SEA) deletion, 3.7-kb and 4.2-kb deletions are the most common causes. The present study aimed to observe the molecular characteristics of this common alpha-Thalassemia deletions and analyse its haematological parameter. Methods Blood samples from 173 healthy volunteers from thalassemia carrier screening in Yogyakarta Special Region were used. Haematological parameters were analysed and used to predict the carrier subjects. Genotype of suspected carriers was determined using multiplex gap-polymerase chain reaction and its haematological parameters were compared. The boundary site of each deletion was determined by analysing the DNA sequences. Results Seventeen (9.8%) of the volunteers were confirmed to have alpha-Thalassemia trait. Of these, four genotypes were identified namely -α3.7/αα (58.8%), -α4.2/αα (5.9%), -α3.7/-α4.2 (5.9%) and - -SEA/αα (29.4%). The 5' and 3' breakpoints of SEA deletion were located at nt165396 and nt184700 of chromosome 16, respectively. The breakpoint regions of 3.7-kb deletion were 176-bp long, whereas for 4.2-kb deletion were 321-bp long. The haematological comparison between normal and those with alpha-Thalassemia trait genotype indicated a significant difference in mean corpuscular volume (MCV) (p< 0.001) and mean corpuscular haemoglobin (MCH) (p< 0.001). As for identifying the number of defective genes, MCH parameter was more reliable (p= 0.003). Conclusion The resultant molecular and haematological features provide insight and direction for future thalassemia screening program in the region.
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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: 100] [Impact Index Per Article: 16.7] [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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Turner A, Sasse J, Varadi A. Development and validation of a high throughput, closed tube method for the determination of haemoglobin alpha gene (HBA1 and HBA2) numbers by gene ratio assay copy enumeration-PCR (GRACE-PCR). BMC MEDICAL GENETICS 2015; 16:115. [PMID: 26683685 PMCID: PMC4683937 DOI: 10.1186/s12881-015-0258-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Accepted: 12/04/2015] [Indexed: 11/13/2022]
Abstract
BACKGROUND Deletions of the α-globin genes are the most common genetic abnormalities in the world. Currently multiplex Gap-PCRs are frequently used to identify specific sets of common deletions. However, these assays require significant post-amplification hands on time and cannot be used to identify novel or unexpected deletions. The aim of the current study was to develop a rapid screening test for the detection of all deletions of the α-globin genes that can be integrated into a high volume clinical laboratory workflow. METHODS A gene ratio assay copy enumeration (GRACE) PCR method was developed by simultaneous amplification of targets in the α-globin genes (HBA1 and HBA2) and the chloride channel voltage sensitive 7 (CLCN7) reference gene. A novel application of High Resolution Melting (HRM) analysis then allowed rapid determination of α-globin gene copy numbers. The assay was validated using 105 samples with previously determined and 62 samples with unknown α-globin genotypes. RESULTS The GRACE-PCR assay detected abnormal α-globin gene copy numbers in 108 of the 167 samples evaluated. The results were consistent with those from a commercial reverse hybridization assay and no allele drop out was observed. CONCLUSIONS We have successfully developed and validated a GRACE-PCR screening test for the detection of deletions and duplications of the α-globin genes. The assay is based on copy number determination and has the ability to detect both known and novel deletions of the α-globin genes. It is a closed tube technique; consequently the risk of amplicon contamination is negligible. Amplification, detection and analysis can be completed within one hour, making it faster, cheaper and simpler than other existing tests and thus well suited as a rapid first step in a clinical laboratory workflow.
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Affiliation(s)
- Andrew Turner
- Department of Pathology and Laboratory Medicine, Sheikh Khalifa Medical City, Abu Dhabi, United Arab Emirates.
| | - Jurgen Sasse
- Department of Pathology and Laboratory Medicine, Sheikh Khalifa Medical City, Abu Dhabi, United Arab Emirates.
| | - Aniko Varadi
- Department of Biological, Biomedical and Analytical Sciences, Faculty of Health and Applied Sciences, University of the West of England, Bristol, UK.
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Wu MY, Li J, Li SC, Li Y, Li DZ. Frequencies of HKαα and anti-HKαα Alleles in Chinese Carriers of Silent Deletional α-Thalassemia. Hemoglobin 2015; 39:407-11. [PMID: 26287669 DOI: 10.3109/03630269.2015.1071268] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The HKαα (HongKongαα) allele is an unusual rearrangement of the α-globin gene cluster containing both the -α(3.7) (rightward) and ααα(anti 4.2) crossover deletion/duplication. The anti-HKαα (anti-HongKongαα) allele is the reciprocal product containing both the -α(4.2) (leftward) and ααα(anti 3.7) unequal crossover deletion/duplication. In clinical practice of thalassemia screening, gap-polymerase chain reaction (gap-PCR) approaches are used to detect the common -α(3.7) and -α(4.2) deletions of α-thalassemia (α-thal). Because the HKαα and anti-HKαα alleles also contain the single α-globin gene deletion, individuals with these alleles would be misdiagnosed as -α(3.7) or -α(4.2) carriers. This would likely produce misleading or incorrect information in genetic counseling. In this study, we investigated the HKαα and anti-HKαα alleles in Chinese carriers of silent deletional α-thal, and reported their frequencies to be 2.27 and 0.35% in -α(3.7) and -α(4.2) carriers, respectively. Given the rarity of the HKαα and anti-HKαα alleles, a routine screening for these two rearrangements are unlikely to be necessary on most occasions.
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Affiliation(s)
- Man-Yu Wu
- a Prenatal Diagnostic Center, Guangzhou Women & Children Medical Center affiliated to Guangzhou Medical University , Guangzhou , Guangdong , People's Republic of China
| | - Jian Li
- a Prenatal Diagnostic Center, Guangzhou Women & Children Medical Center affiliated to Guangzhou Medical University , Guangzhou , Guangdong , People's Republic of China
| | - Shu-Chen Li
- a Prenatal Diagnostic Center, Guangzhou Women & Children Medical Center affiliated to Guangzhou Medical University , Guangzhou , Guangdong , People's Republic of China
| | - Yan Li
- b Guangzhou Cord Blood Bank, Guangzhou Women & Children Medical Center affiliated to Guangzhou Medical University , Guangzhou , Guangdong , People's Republic of China
| | - Dong-Zhi Li
- a Prenatal Diagnostic Center, Guangzhou Women & Children Medical Center affiliated to Guangzhou Medical University , Guangzhou , Guangdong , People's Republic of China
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Gao L, Liu Y, Sun M, Zhao Y, Xie R, He Y, Xu W, Liu J, Lin Y, Lou J. Rapid detection of α-thalassaemia alleles of --(SEA)/, -α(3.7)/ and -α(4.2)/ using a dual labelling, self-quenching hybridization probe/melting curve analysis. Mol Cell Probes 2015; 29:438-441. [PMID: 26190814 DOI: 10.1016/j.mcp.2015.07.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Revised: 06/17/2015] [Accepted: 07/13/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVES The aim of the study was to set up an alternative automatic molecular diagnostic method for deletional α-thalassaemia mutations without gel electrophoresis. METHODS Based on the sequence variation within the two Z boxes and melting curve analysis of dually labelled probes, a real-time PCR assay was developed and validated for the rapid detection of major α-genotypes (--(SEA)/αα, --(SEA)/-α(3.7), --(SEA)/-α(4.2), --(SEA)/--(SEA), -α(3.7)/-α(3.7) and -α(4.2)/-α(4.2)). RESULTS Samples with the -α(3.7)/-α(3.7), -α(4.2)/-α(4.2), --(SEA)/αα, --(SEA)/-α(3.7), --(SEA)/-α(4.2), and --(SEA)/--(SEA) genotypes could be clearly distinguished. The accuracy of this technique for these samples was 100% sensitivity and specificity. CONCLUSION This technique is rapid and reliable, demonstrating feasibility for use in large-scale population screening and prenatal diagnosis of deletional Hb H disease and Hb Bart's hydrops fetalis.
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Affiliation(s)
- Lan Gao
- Department of Clinical Laboratory, Henan Province People's Hospital, Zhengzhou, Henan, China
| | - Yanhui Liu
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, Guangdong, China
| | - Manna Sun
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, Guangdong, China
| | - Ying Zhao
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, Guangdong, China
| | - Rungui Xie
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, Guangdong, China
| | - Yi He
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, Guangdong, China
| | - Wanfang Xu
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, Guangdong, China
| | - Jianxin Liu
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, Guangdong, China
| | - Yangyang Lin
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, Guangdong, China
| | - Jiwu Lou
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, Guangdong, China.
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Greene DN, Vaughn CP, Crews BO, Agarwal AM. Advances in detection of hemoglobinopathies. Clin Chim Acta 2014; 439:50-7. [PMID: 25314938 DOI: 10.1016/j.cca.2014.10.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 10/04/2014] [Accepted: 10/04/2014] [Indexed: 01/19/2023]
Abstract
Hemoglobin disorders are recognized as one of the most common inherited diseases worldwide. Detecting and characterizing variant hemoglobins and thalassemias depends primarily on clinical laboratory methods. Multiple biophysical, biochemical, and genetic assays are available to provide phenotypic or genotypic evidence of pathology. For many years conventional slab-gel electrophoresis and HPLC were the most commonly utilized laboratory methods. However, the field has rapidly expanded to regularly include capillary zone electrophoresis, molecular assays, and, more recently, mass spectrometric assays. Interpretation of these techniques is, in general, complicated because of the involvement of multiple polymorphic genes. Proper characterization of hemoglobin variants is necessary for diagnosis, primary prevention and genetic counseling for underlying disorders. This review provides an overview of the current hemoglobin analysis techniques, and also discusses technologies that have potential to translate into widespread clinical settings.
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Affiliation(s)
- Dina N Greene
- TPMG, Northern California Kaiser Permanente Regional Laboratories, Berkeley, CA, United States.
| | - Cecily P Vaughn
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, United States
| | - Bridgit O Crews
- TPMG, Northern California Kaiser Permanente Regional Laboratories, Berkeley, CA, United States
| | - Archana M Agarwal
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, United States; Department of Pathology, University of Utah Health Sciences, Salt Lake City, UT, United States
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Prakobkaew N, Fucharoen S, Fuchareon G, Siriratmanawong N. Phenotypic expression of Hb F in common high Hb F determinants in Thailand: roles ofα-thalassemia, 5′ δ-globin BCL11A binding region and 3′ β-globin enhancer. Eur J Haematol 2013; 92:73-9. [DOI: 10.1111/ejh.12201] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/11/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Nattaphol Prakobkaew
- The Graduate School; Khon Kaen University; Khon Kaen Thailand
- Centre for Research and Development of Medical Diagnostic Laboratories; Faculty of Associated Medical Sciences; Khon Kaen University; Khon Kaen Thailand
| | - Supan Fucharoen
- Centre for Research and Development of Medical Diagnostic Laboratories; Faculty of Associated Medical Sciences; Khon Kaen University; Khon Kaen Thailand
| | - Goonnapa Fuchareon
- Centre for Research and Development of Medical Diagnostic Laboratories; Faculty of Associated Medical Sciences; Khon Kaen University; Khon Kaen Thailand
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Zhou W, Wang G, Zhao X, Xiong F, Zhou S, Peng J, Cheng Y, Xu S, Xu X. A Multiplex qPCR Gene Dosage Assay for Rapid Genotyping and Large-Scale Population Screening for Deletional α-Thalassemia. J Mol Diagn 2013; 15:642-51. [DOI: 10.1016/j.jmoldx.2013.05.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 05/12/2013] [Accepted: 05/20/2013] [Indexed: 11/15/2022] Open
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9
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Liao YM, Lin SK, Liu TC, Chiou SS, Lu HC, Kao CF, Chang JG. Rapid identification of the copy number of α-globin genes by capillary electrophoresis analysis. Clin Biochem 2012; 45:798-805. [PMID: 22374170 DOI: 10.1016/j.clinbiochem.2012.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 01/19/2012] [Accepted: 02/09/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVES The current study aimed at the rapid identification of the copy number of α-globin genes for the diagnosis of α-thalassemia. DESIGN AND METHODS To identify the copy number of α-globin genes in α-thalassemia, we developed a novel method using a multiplex polymerase chain reaction (PCR) in combination with the CE analysis. RESULTS The proposed method provides a rapid detection of the common α-globin gene deletions. Sixty-six patients with α-thalassemia and 46 normal controls were included in the present study. The obtained results showed good correlation with those obtained by gap PCR. Moreover, a low amount of maternal cell contamination in the fetus specimen for the prenatal diagnosis of hemoglobin Barts hydrops fetalis as well as the rare multiplicated α-globin genes can be identified using this method. CONCLUSION This method provides a convenient and efficient tool for the rapid identification of the copy number of α-globin genes in α-thalassemia and the individuals with α-globin gene multiplication.
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Affiliation(s)
- Yu-Mei Liao
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
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10
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Jia X, Wei X, Liu Q, Cao M, Wang L, Zheng M, Liu J. An assay of gene copy number and its application based on heteroduplex products. Exp Mol Pathol 2011; 91:429-33. [DOI: 10.1016/j.yexmp.2011.04.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2011] [Accepted: 04/19/2011] [Indexed: 10/18/2022]
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Chen YL. Capillary electrophoresis combining three-step multiplex polymerase chain reactions for diagnosing α-thalassemia. Electrophoresis 2010; 32:379-85. [DOI: 10.1002/elps.201000448] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Revised: 11/11/2010] [Accepted: 11/11/2010] [Indexed: 11/11/2022]
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12
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Shih HC, Er TK, Chang TJ, Chang YS, Liu TC, Chang JG. Development of a high-resolution melting method for the detection of hemoglobin alpha variants. Clin Biochem 2010; 43:671-6. [DOI: 10.1016/j.clinbiochem.2010.01.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Revised: 01/13/2010] [Accepted: 01/25/2010] [Indexed: 10/19/2022]
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Liu J, Jia X, Tang N, Wang L, Han H, Cai R, Wang Q, Xiao B. A comprehensive, simple molecular assay of common deletions and mutations causing alpha-thalassemia in Southeast Asia and southern China. Am J Hematol 2010; 85:370-2. [PMID: 20425799 DOI: 10.1002/ajh.21671] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Liu X, Law HY, Tan YM, Hong Y. High-throughput beta-thalassemia carrier screening by allele-specific Q-primer real-time polymerase chain reaction. Anal Biochem 2010; 404:97-9. [PMID: 20433808 DOI: 10.1016/j.ab.2010.04.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 04/21/2010] [Accepted: 04/22/2010] [Indexed: 10/19/2022]
Abstract
Based on a novel Q-primer real-time polymerase chain reaction (PCR) system, we designed allele-specific Q-primers for the detection of three beta-thalassemia mutations [Cd41/42(-TCTT), IVSI nt5 (G>C), and IVSII nt654 (C>T)] that have a high carrier frequency in Southeast Asia. With clear distinction between heterozygote and wild-type, DeltaC(t) (threshold cycle) values were defined. The results of evaluating 139 blinded samples by our system match perfectly with those obtained by the conventional reverse dot blot (RDB) method. With a 384-well plate that included replicates in the same analysis, our throughput reached 190 reactions per run with a turnaround time as short as 130 min, and the cost of consumables was as low as $1 (US) for each test.
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Novel technique for rapid detection of alpha-globin gene mutations and deletions. Transl Res 2010; 155:148-55. [PMID: 20171600 DOI: 10.1016/j.trsl.2009.10.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2009] [Revised: 10/14/2009] [Accepted: 10/16/2009] [Indexed: 11/20/2022]
Abstract
Populations in Southeast Asia and South China have high frequencies of alpha-thalassemia caused by alpha-globin gene mutations and/or deletions. This study was designed to find an efficient and simple diagnostic test for the mutations and deletions. A duplex polymerase chain reaction (PCR)/denaturing high-pressure liquid chromatography (DHPLC) was used to detect the mutations and deletions. A blinded study of 110 samples, which included 92 alpha-thalassemia samples with various genotypes and 18 normal DNA samples, was carried out by the methods. The duplex PCR products of the sample with known Constand spring mutation (CS)/alphaalpha, Quonsze mutation (QS)/alphaalpha, and Weastmead mutation (WS)/alphaalpha DNA showed significantly different profiles, which suggests that DHPLC analysis at 63.8 degrees C can detect potential mutations directly. The DHPLC at 50 degrees C analysis can distinguish the --SEA and nondeletional alleles. The new assay is 100% concordant with the original genotype. In conclusion, the technique including the duplex PCR assay followed by DHPLC analysis can be used to diagnose alpha-thalassemia; this methodology is simple, rapid, accurate, semiautomatic, and high output, and thus, it is suitable for large-scale screening.
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Hung CC, Lin SY, Lee CN, Cheng HY, Lin SP, Chen MR, Chen CP, Chang CH, Lin CY, Yu CC, Chiu HH, Cheng WF, Ho HN, Niu DM, Su YN. Mutation spectrum of the fibrillin-1 (FBN1) gene in Taiwanese patients with Marfan syndrome. Ann Hum Genet 2009; 73:559-67. [PMID: 19839986 DOI: 10.1111/j.1469-1809.2009.00545.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aim of this study was to establish a national database of mutations in the fibrillin-1 (FBN1) gene that cause Marfan syndrome (MFS) in the Taiwanese population. In this study, we screened 294 patients from 157 families for the presence of FBN1 mutations using polymerase chain reaction/ denaturing high performance liquid chromatography (PCR/DHPLC). We identified 56 mutations in 62 of the 157 (40%) families including 49 single-base substitutions (36 missense mutations, seven nonsense mutations, and six splicing sites), one small insertion, four small deletions, one small indel (insertion and deletion), and one exonic deletion (Exon 36). When family history was taken into consideration, the mutation detection rate rose to 91% (29 of 32). We further investigated the phenotypic data and found that one third (47 of 157) of the families fit the Ghent criteria for MFS. Based on that data, the mutation rate was 98% (46/47). That finding implies that family history and the Ghent criteria play a more important role than clinical manifestations in establishing a clinical diagnosis of Marfan syndrome. Among the 56 mutations found in this study, 40 (71%) have not been registered in the Human Gene Mutation Database (HGMD) or in the Universal Mutation Database (UMD). This is the first study of the mutation spectrum of MFS in a cohort of patients in Taiwan. The database is expected to considerably improve genetic counseling for and medical care of MFS families.
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Affiliation(s)
- Chia-Cheng Hung
- Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan
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Identification of fibrillin-1 gene mutations in Marfan syndrome by high-resolution melting analysis. Anal Biochem 2009; 389:102-6. [PMID: 19328768 DOI: 10.1016/j.ab.2009.03.032] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2009] [Revised: 03/23/2009] [Accepted: 03/23/2009] [Indexed: 01/15/2023]
Abstract
Marfan syndrome has been associated with approximately 562 mutations in the fibrillin-1 (FBN1) gene. Mutation scanning of the FBN1 gene with DNA direct sequencing is time-consuming and expensive because of its large size. This study analyzed the diagnostic value of high-resolution melting analysis as an alternative method for scanning of the FBN1 gene. A total of 75 polymerase chain reaction (PCR) amplicons (179-301bp, average 256bp) that covered the complete coding regions and splicing sites were evaluated on the 96-well LightCycler system. Melting curves were analyzed as fluorescence derivative plots (-dF/dT vs. temperature). To determine the sensitivity of this method, a total of 82 samples from patients with Marfan syndrome and 50 unaffected individuals were analyzed. All mutations reported in this study had been confirmed previously by direct sequencing analysis. Melting analysis identified 48 heterozygous variants. The variant c.3093 G>T (exon 25) was incorrectly identified by melting curve analysis. The sensitivity of the technique in this sample was 98.78% (81/82). This study demonstrated that high-resolution melting analysis is a reliable gene scanning method with greater speed than DNA sequencing. Our results support the use of this technology as an alternative method for the diagnosis of Marfan syndrome as well as its suitability for high-throughput mutation scanning of other large genes.
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Chen YL, Shih CJ, Ferrance J, Chang YS, Chang JG, Wu SM. Genotyping of α-thalassemia deletions using multiplex polymerase chain reactions and gold nanoparticle-filled capillary electrophoresis. J Chromatogr A 2009; 1216:1206-12. [DOI: 10.1016/j.chroma.2008.12.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2008] [Revised: 12/11/2008] [Accepted: 12/15/2008] [Indexed: 11/24/2022]
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