β 0 -Thalassemia Caused by a Novel Nonsense Mutation [ HBB: c.199A > T].

We report two hemoglobinopathy cases involving a novel β-thalassemia (β-thal) nonsense mutation, HBB: c.199A > T. One patient had Hb S/β-thal, and a second unrelated patient had Hb D-Punjab/β-thal. The HBB: c.199A > T mutation introduces a premature termination codon at amino acid codon 66 (AAA→TAA) in exon 2, resulting in typical high Hb A 2 β 0 -thal.