A New δ-Globin Gene Variant: Hb A2-Yulin [δ46(CD5)Gly→Arg, HBD : C.139G > A].

We report a new δ-chain hemoglobin (Hb) variant observed in a 5-year-old female living in Yulin, Guangxi, China. Capillary electrophoresis revealed splitting of the Hb A ₂ peak into two fractions (Hb A ₂ and Hb A ₂ variant), and the Hb A ₂ variant was also detected by high-performance liquid chromatography. However, it could not be detected using matrix-assisted laser desorption lonization-time of flight mass spectrometry. CD41-42 (-TCTT) heterozygosity was observed on the HBB gene by PCR and reverse dot-blot hybridization. Sanger sequencing showed a new transition (G > A) at codon 46 of the HBD gene, resulting in glycine changing to arginine. Based on the patient's place of residence, the new variant was named Hb A ₂ -Yulin [δ46(CD5)Gly→Arg, HBD :c.139G > A].