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Abstract
The α+-thal deletion of 3.557 kb (NG_000006.1: g.32745_36301del, -αMAL3.5), involving the entire α2-globin gene, was identified in a Chinese family by multiplex ligation-dependent probe amplification (MLPA) followed by gap-polymerase chain reaction (gap-PCR) and sequencing. The proband, a compound heterozygote for this mutant gene and the Southeast Asian (- -SEA; NG_000006.1: g.26264_45564del19301) deletion, had a phenotype of Hb H disease [hemoglobin (Hb) 7.6 g/dL, mean corpuscular volume (MCV) 60.0 fL, Hb H (β4) 0.7%, Hb Bart's (γ4) 2.4% and Hb A2 1.1%]; one of her sisters with same genotype showed a similar phenotype. Another two family members, who were carriers of this mutant gene, had a hematological phenotype of a silent α-thal. The 5' and 3' breakpoints of this deletion are located at the Y2 and Y1 boxes, respectively, therefore, it probably originated from an unequal crossover between these two homologous boxes. This mutation constitutes an additional heterogeneous defect causing α-thal in the Chinese population and would be valuable for elucidating the arrangement in the human α-globin gene cluster.
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Affiliation(s)
- Ying Zhao
- a Dongguan Maternal and Child Health Hospital , Prenatal Diagnosis Center , Dongguan , Guangdong , People's Republic of China
| | - Jiwu Lou
- a Dongguan Maternal and Child Health Hospital , Prenatal Diagnosis Center , Dongguan , Guangdong , People's Republic of China
| | - Manna Sun
- a Dongguan Maternal and Child Health Hospital , Prenatal Diagnosis Center , Dongguan , Guangdong , People's Republic of China
| | - Youqing Fu
- a Dongguan Maternal and Child Health Hospital , Prenatal Diagnosis Center , Dongguan , Guangdong , People's Republic of China
| | - Wanling Ye
- a Dongguan Maternal and Child Health Hospital , Prenatal Diagnosis Center , Dongguan , Guangdong , People's Republic of China
| | - Yanjin Li
- a Dongguan Maternal and Child Health Hospital , Prenatal Diagnosis Center , Dongguan , Guangdong , People's Republic of China
| | - Yunshi Dai
- a Dongguan Maternal and Child Health Hospital , Prenatal Diagnosis Center , Dongguan , Guangdong , People's Republic of China
| | - Yanhui Liu
- a Dongguan Maternal and Child Health Hospital , Prenatal Diagnosis Center , Dongguan , Guangdong , People's Republic of China
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He S, Qin Q, Huang P, Zhang S, Yi S, Lin L, Zuo Y, Chen Q, Deng J, Zheng C, Chen B. Characterization of a Large Novel α-Globin Gene Cluster Deletion Causing α 0-Thalassemia in a Chinese Family. Hemoglobin 2017; 41:297-299. [PMID: 29161910 DOI: 10.1080/03630269.2017.1366919] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 01/10/2023]
Abstract
We report a large novel α-globin cluster deletion that we named - -PG (NG_000006.1: g.93628_542759del450131), in a Chinese family. This large deletion is approximately 450 kb long, spanning from upstream of the PolR3k gene at the 5' end to the RAB11FIP3 gene at the 3' end of chromosome 16p13.3. This deletion removes all the globin distal regulatory elements as well as the whole α-globin gene cluster. Patients with heterozygous - -PG/αα had red blood cell (RBC) indices consistent with α-thalassemia (α-thal) trait, but no apparent increase in a cancer tendency or mental disability, microcephaly, relative hypertelorism, unusual facies or genital anomalies.
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Affiliation(s)
- Sheng He
- a Prenatal Diagnostic Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Qian Qin
- b Prenatal Diagnostic Center , Baise Women and Children Care Hospital , Baise , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Peng Huang
- a Prenatal Diagnostic Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Shujie Zhang
- a Prenatal Diagnostic Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Shang Yi
- a Prenatal Diagnostic Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Li Lin
- a Prenatal Diagnostic Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Yangjin Zuo
- a Prenatal Diagnostic Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Qiuli Chen
- a Prenatal Diagnostic Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Jianping Deng
- b Prenatal Diagnostic Center , Baise Women and Children Care Hospital , Baise , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Chenguang Zheng
- a Prenatal Diagnostic Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , Guangxi Zhuang Autonomous Region , People's Republic of China
| | - Biyan Chen
- a Prenatal Diagnostic Center , Guangxi Zhuang Autonomous Region Women and Children Care Hospital , Nanning , Guangxi Zhuang Autonomous Region , People's Republic of China
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3
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Abstract
A previously unknown α(0) deletion, designated - -(DANE), was found in three generations of a Danish family of Palestinian origin. Six patients were heterozygous and three patients had deletional Hb H (β4) disease with a compound heterozygosity for the common -α(3.7) (rightward) deletion. Multiplex ligation-dependent probe amplification (MLPA) supplemented by repeated polymerase chain reaction (PCR) amplification identified the 5' and 3' breakpoints in the α-globin gene cluster. This novel 31.2 kb deletion (NG_000006.1: g.8800_40007del31208) leads to the removal of the HBZ, HBA2 and HBA1 genes.
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Affiliation(s)
- Christian Brieghel
- a Center for Haemoglobinopathies, Department of Haematology, Copenhagen University Hospital , Herlev , Denmark
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Gilad O, Dgany O, Noy-Lotan S, Krasnov T, Elitzur S, Pissard S, Kventsel I, Yacobovich J, Tamary H. Characterization of two unique α-globin gene cluster deletions causing α-thalassemia in Israeli Arabs. Hemoglobin 2014; 38:319-24. [PMID: 25222045 DOI: 10.3109/03630269.2014.954668] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [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: 11/13/2022]
Abstract
The molecular basis of α-thalassemia (α-thal) is complex. The use of multiplex ligation-dependent probe amplification (MLPA) has offered the possibility of identifying more gene deletions causing α-thal. Our objective was to determine the molecular basis of two patients with Hb H (β4) disease. By using MLPA in combination with comparative genomic hybridization (CGH) we identified two novel α-globin gene cluster deletions: a 30 kb deletion (patient 1) we refer to as - -(JAL) and a large 216 kb deletion (patient 2) we refer to as - -(LOD). Patient 1 was a compound heterozygote for - -(JAL) and -α(3.7) (rightward deletion). Twelve family members of patient 1 carrying the - -(JAL) deletion were available for evaluation: five with - -(JAL)/-α(3.7), four with - -(JAL)/α(Hph I)α and three with - -(JAL)/αα. Their clinical picture of compound heterozygosity was compatible with moderate Hb H disease. In patient 2 (- -(LOD)/-α(3.7)), no additional symptoms were present despite the heterozygous deletion of seven known genes, three non coding RNAs (ncRNAs), four unknown genes and two pseudo genes. Further analysis of more patients with α-thal deletions will have implications for genetic counseling and appropriate therapy.
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Affiliation(s)
- Oded Gilad
- Department of Pediatrics B, Schneider Children's Medical Center of Israel , Petah Tikva , Israel
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