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Published on: September 6, 2017
Compound heterozygous Hb Tak/Hb E causes secondary erythrocytosis in a Thai family
Nattiya Teawtrakul1, Chittima Sirijirachai, Ganjana Chansung
1Hematology Division, Department of Internal Medicine, Srinagarind hospital, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand. nattiya@kku.ac.th
Abstract:
Hb Tak is a rare cause of secondary erythrocytosis. It results from the insertion of two nucleotides (AC) at the termination codon between codon 146 and codon 147 of the beta-globin gene. This insertion causes a frameshift in the terminating codon 147 resulting in an elongated beta chain with an impaired formation of the T-state. We report a Thai family with a compound heterozygosity for Hb Tak [beta147 (+ AC)] and Hb E [beta26(B8)Glu-->Lys] which displayed an asymptomatic erythrocytosis.
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