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Xu ML, Qin JC, Chen BY, Yang XX, Liu HP, Yuan WX, Zhong JM, Huang LM, Zhou WJ. Characterization of a Novel 71.8 kb α 0-Thalassemia Deletion and Subsequent Summary of a Practical Procedure for Thalassemia Molecular Diagnosis. Hemoglobin 2020; 44:259-263. [PMID: 32646243 DOI: 10.1080/03630269.2020.1790385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Thalassemia is the most common monogenic disorder around the world. Based on the principle of genotype-phenotype correlation, identification of thalassemia mutations is the essential prerequisite for clinical diagnosis and management. Because only common mutations are routinely detected, the identification of rare or undetermined mutations is a challenge for clinical laboratories. Herein, a proband presenting with inconsistent phenotype-genotype correlation after routine molecular screening was investigated by multiplex ligation-dependent probe amplification (MLPA), targeted-next generation sequencing (targeted-NGS), gap-polymerase chain reaction (gap-PCR) and Sanger sequencing. Eventually, a novel 71.8 kb deletion (- -71.8) was identified and characterized, which included HBZ (ζ), HBA2 (α2), and HBA1 (α1) genes and was causing α0-thalassemia (α0-thal). Furthermore, we summarized a practical procedure based on accumulated experience in studies and clinical practice, which can be a guide for molecular screening and clinical diagnosis of thalassemia, especially for identification of undetermined or novel mutations.
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Affiliation(s)
- Ming-Li Xu
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Jia-Chun Qin
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Bi-Yan Chen
- Department of Genetic Metabolism, Prenatal Diagnostic Center, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, People's Republic of China
| | - Xue-Xi Yang
- School of Laboratory Medical and Biotechnology, Southern Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Hai-Ping Liu
- Neonatal Screening Center, Maternal and Child Health Hospital of Foshan, Foshan, Guangdong Province, People's Republic of China
| | - Wei-Xi Yuan
- Neonatal Screening Center, Maternal and Child Health Hospital of Foshan, Foshan, Guangdong Province, People's Republic of China
| | - Jian-Mei Zhong
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Li-Min Huang
- School of Laboratory Medical and Biotechnology, Southern Medical University, Guangzhou, Guangdong Province, People's Republic of China
| | - Wan-Jun Zhou
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong Province, People's Republic of China
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