Hemoglobin J Guantanamo [alpha 2 beta 2 128 (H6) Ala----Asp] in association with hemoglobin C and alpha-thalassemia in a family from Benin
- PMID:2841847
- DOI: 10.1002/ajh.2830280308
Hemoglobin J Guantanamo [alpha 2 beta 2 128 (H6) Ala----Asp] in association with hemoglobin C and alpha-thalassemia in a family from Benin
Abstract
Hemoglobin J (HbJ), Guantanamo, which had been described but once in the literature, was found in a family originating from Benin; this second case was found to be in association with hemoglobin C (HbC) and alpha-thalassemia. High-performance liquid chromatography (HPLC) procedures and microsequencing were used for characterization of the aminoacid substitution. The main hematological disorder, in relation with the instability of Hb J Guantanamo, seems to be a worsening of the rheological properties of the red blood cells (RBC), as demonstrated by ektacytometric studies. Oxygen-binding properties of the RBC were almost normal, but a slight decrease in cooperativity and lowered Bohr and 2,3-diphosphoglycerate (DPG) effects were observed for pure stripped Hb J Guantanamo. The expression of the electrophoretic charge difference was partly masked, as is often observed when the structural abnormality is situated in or near a contact area.
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