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Qin D, Du L, Wang J, Yao C, Guo H, Yuan T, Liang J, Yin A. Compound heterozygosity for hemoglobin variant Hb-Broomhill and the Southeast Asian α-thalassemia deletion does not worsen outcome: a case report of two unrelated patients. J Int Med Res 2020; 48:300060520967825. [PMID: 33213249 PMCID: PMC7683915 DOI: 10.1177/0300060520967825] [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] [Indexed: 11/22/2022] Open
Abstract
We report two unrelated cases of compound heterozygosity for hemoglobin (Hb) variant Broomhill and the Southeast Asian (- - SEA/) α-thalassemia deletion, whose clinical features and laboratory findings have never been reported. Hematological analyses revealed abnormal values for both cases as α-thalassemia traits, and capillary electrophoresis suggested an abnormal peak that was incompletely separated from the Hb A peak. A suspension array system and Sanger sequencing were used to characterize the genotypes. Sanger sequencing confirmed the presence of Hb Broomhill [α114(GH2)Pro→Ala; HBA1: c.343C>G]. Eventually, both cases were accurately diagnosed as compound heterozygotes for Hb Broomhill and the (- - SEA/) α-thalassemia deletion, which is the first known report of these variants. This information will be useful when providing appropriate genetic counselling and prenatal diagnosis.
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Affiliation(s)
- Danqing Qin
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Maternal and Children Metabolic-Genetic Key Laboratory, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Thalassemia Diagnosis Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China
| | - Li Du
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Maternal and Children Metabolic-Genetic Key Laboratory, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Thalassemia Diagnosis Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China
| | - Jicheng Wang
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Maternal and Children Metabolic-Genetic Key Laboratory, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Thalassemia Diagnosis Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China
| | - Cuize Yao
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Maternal and Children Metabolic-Genetic Key Laboratory, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Thalassemia Diagnosis Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China
| | - Hao Guo
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Maternal and Children Metabolic-Genetic Key Laboratory, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Thalassemia Diagnosis Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China
| | - Tenglong Yuan
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Maternal and Children Metabolic-Genetic Key Laboratory, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Thalassemia Diagnosis Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China
| | - Jie Liang
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Maternal and Children Metabolic-Genetic Key Laboratory, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Thalassemia Diagnosis Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China
| | - Aihua Yin
- Medical Genetic Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Maternal and Children Metabolic-Genetic Key Laboratory, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China.,Thalassemia Diagnosis Center, Guangdong Women and Children Hospital, Guangzhou, Guangdong, China
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