Abstract
Hb Yokohama [beta 31 (B13)Leu----Pro] was observed in a young Yugoslavian boy as a de novo mutation. The child exhibited severe transfusion-dependent hemolytic anemia. The variant was detected and quantitiated at 10.5% by reversed phase high performance liquid chromatography. In vitro globin chain synthesis showed a slight imbalance with an alpha/beta ratio of 1.38. Structural characterization of the abnormal beta chain was done by high performance liquid chromatographic analysis, on material obtained by high salt precipitation. The mutation was confirmed by sequencing of the amplified DNA.
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