A Further Example of Hemoglobin Hikari (β 61[E5] Lys→ Asn)

Hemoglobin Hakkari: an autosomal dominant form of beta thalassemia with inclusion bodies arising from de novo mutation in exon 2 of beta globin gene

Certain beta globin gene mutations produce a thalassemia major phenotype in the heterozygous state. While most such patients have thalassemia intermedia, we describe a young Guatemalan child with a de novo mutation in the beta globin gene, codon 31 T --> G (Hemoglobin Hakkari), who developed severe anemia at the age of 10 months and remains transfusion-dependent. The substitution of B13 leucine with arginine in the beta globin results in alteration of a critical heme contact point resulting in an extremely unstable variant hemoglobin and a clinical picture that is characterized by ineffective erythropoiesis and numerous intracytoplasmic inclusions within the erythrocyte precursors of the bone marrow. .

A new unstable hemoglobin, Hb Yokohama beta 31 (B13)Leu substituting for Pro, causing hemolytic anemia

A new unstable hemoglobin was found in a 33-year-old Japanese woman with a history of chronic, partially compensated hemolytic anemia. An electrophoretically silent unstable beta chain was prepared by PCMB precipitation and the amino acid substitution determined as beta 31(B13)Leu substituting for Pro. Her son was a carrier of the same variant, who manifested milder symptoms.