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Hb Chapel Hill or Alpha2 74(EF3) Asp>Gly, a mildly unstable variant found in a Chinese family. 2023

Bin Tang, and Jicheng Wang, and Danqinq Qin, and Cuize Yao, and Keyi Chen, and Lihua Liang, and Huiying Chai, and Hao Guo, and Li Du
Medical Genetics Center, Guangdong Women and Children Hospital, Guangzhou, People's Republic of China.

Hb Chapel Hill [Alpha2 74(EF3) Asp > Gly] results from an GAC > GGC substitution at codon 74 of the HBA1 or HBA2 genes. Hb Chapel Hill has not been reported since 1986. A heterozygous mutation, HBA2: c.224A > G, was identified in the proband, her father and sister. We compared the haematological and clinical data of this family with the data reported in the limited number of individuals. Having excluded iron deficiency, the Hb Chapel Hill was asymptomatic in heterozygous state. The cases presented here characterize cases in new techniques including capillary electrophoresis (CE). Two aberrant peaks were identified by CE, a major peak migrating in the zone 7 that correspond to Hb Chapel Hill (αChapel Hill 2β2) and a minor peak migrating in the zone 1 that correspond to Hb Chapel Hill2 (αChapel Hill 2δ2). Focusing on the variant expression, the Hb Chapel Hill plus Hb A2 variant were around 18.9-20.6% of total Hb in three members. This data will be useful for providing up-to-date and high quality information on the Hb Chapel Hill.

UI MeSH Term Description Entries
D008297 Male Males
D009154 Mutation Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations. Mutations
D005260 Female Females
D006455 Hemoglobins, Abnormal Hemoglobins characterized by structural alterations within the molecule. The alteration can be either absence, addition or substitution of one or more amino acids in the globin part of the molecule at selected positions in the polypeptide chains. Abnormal Hemoglobins
D006579 Heterozygote An individual having different alleles at one or more loci regarding a specific character. Carriers, Genetic,Genetic Carriers,Carrier, Genetic,Genetic Carrier,Heterozygotes
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000095225 East Asian People East Asians,Eastern Asian People,Eastern Asians,Far East Asians,Chinese,Japanese,Koreans,Asian People, East,Asian People, Eastern,Asian, East,Asian, Eastern,Asian, Far East,East Asian,East Asian Peoples,Eastern Asian,Eastern Asian Peoples,Far East Asian,People, East Asian,People, Eastern Asian
D017085 alpha-Thalassemia A disorder characterized by reduced synthesis of the alpha chains of hemoglobin. The severity of this condition can vary from mild anemia to death, depending on the number of genes deleted. Hemoglobin H Disease,Thalassemia-alpha,A-Thalassemia,Alpha Thalassemia,Disease, Hemoglobin H,Thalassemia alpha,Thalassemia, Alpha,alpha-Thalassemias
D055542 alpha-Globins Members of the alpha-globin family. In humans, they are encoded in a gene cluster on CHROMOSOME 16. They include zeta-globin and alpha-globin. There are also pseudogenes of zeta (theta-zeta) and alpha (theta-alpha) in the cluster. Adult HEMOGLOBIN is comprised of 2 alpha-globin chains and 2 beta-globin chains. alpha-Globin,alpha 1-globin,alpha-1 Globin,alpha-2 Globin,1-globin, alpha,Globin, alpha-1,Globin, alpha-2,alpha 1 Globin,alpha 2 Globin,alpha Globin,alpha Globins

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