A woman completely lacking Hb A on the high performance liquid chromatography (HPLC) analysis, presented with a novel deletional (εγ)δβ-thal and a δ-globin gene variant. This combination causes a β-thalassemia (β-thal) minor phenotype. The woman was referred by a hematologist due to abnormal blood counts. Multiplex ligation-dependent probe amplification (MLPA) and microarray analysis showed a heterozygous, 177 kb long deletion that removed the locus control region enhancer plus the ε, γ and γ genes. Additional sequencing revealed a novel variant : c.209G>A, p.Gly70Asp in the heterozygous state, called Hb A-Gebenstorf. The combination of the two variants explains the lack of Hb A in this woman.

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http://dx.doi.org/10.1080/03630269.2020.1779739DOI Listing

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