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Hemoglobin ; 43(1): 63-65, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31037981


Hb A'2 (or Hb B2) (HBD: c.49G>C) is the most frequent δ chain variant that has been described in Africa but not in Thailand. We report here a 10-month-old Thai infant with compound heterozygosity for ß0 codon 17 (A>T; HBB: c.52A>T) and ß+ IVS II-654 (C>T; HBB: c.316-197C>T). Under diagnosed ß-thalassemia (ß-thal) in her father, who carries Hb A'2 and a heterozygous ß0 codon 17 mutation, and the mother, who carries a heterozygous ß+ IVS II-654 mutation, was noted. Although Hb A'2 does not cause any problems, heterozygosity for Hb A'2 can lead to under diagnosis of ß-thal in Hb A'2 samples. This case highlights the importance of Hb A'2 in prenatal diagnosis (PND). Thus, molecular analysis for ß-thal mutations should be carried out when a small peak presents at the retention time (RT) of 4.71 min. on high performance liquid chromatography (HPLC) and the summation level of this peak and Hb A2 was equal or higher than 4.0%.

Hemoglobina A2/genética , Heterozigoto , Globinas beta/genética , Talassemia beta/diagnóstico , Talassemia beta/genética , Adulto , Cromatografia Líquida de Alta Pressão , Códon , Índices de Eritrócitos , Feminino , Genótipo , Hemoglobina A2/química , Hemoglobinas Anormais/química , Hemoglobinas Anormais/genética , Humanos , Lactente , Masculino , Mutação , Diagnóstico Pré-Natal , Globinas beta/química , Talassemia beta/sangue