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Hb Iowa or alpha 2 beta 2(119)(GH2)Gly----Ala
D Plaseska1, P A de Alarcon, S McMillan
1Department of Cell and Molecular Biology, Medical College of Georgia, Augusta 30912-2100.
Hemoglobin
|January 1, 1990
Summary
A novel hemoglobin variant, Hb Iowa, featuring a Gly----Ala mutation, was identified in a Black infant and her mother. This variant, initially mistaken for Hb F, showed normal stability and oxygen transport capabilities.
Area of Science:
- Hematology
- Biochemistry
- Genetics
Background:
- Hemoglobin variants can impact oxygen transport and diagnostic procedures.
- Distinguishing between similar hemoglobin types is crucial for accurate diagnosis.
Purpose of the Study:
- To characterize a newly identified hemoglobin variant, Hb Iowa.
- To investigate the structural and functional properties of Hb Iowa.
- To differentiate Hb Iowa from other hemoglobin types, including Hb F and Hb S.
Main Methods:
- Polyacrylamide gel electrophoresis (PAGE) for separating hemoglobin chains.
- Reversed-phase high-performance liquid chromatography (RP-HPLC) for purification and separation.
- Amino acid analysis of tryptic peptides for structural elucidation.
Main Results:
- Hb Iowa, with a Gly----Ala substitution at beta 119(GH2), was identified in an infant and her mother.
- Hb Iowa was initially confused with fetal hemoglobin (Hb F) due to similar electrophoretic mobility.
- PAGE and RP-HPLC successfully separated the beta-Iowa chain from other globin chains.
- Structural analysis confirmed the specific amino acid substitution.
Conclusions:
- The Gly----Ala mutation in Hb Iowa does not compromise hemoglobin stability or oxygen-carrying capacity.
- Hematological parameters for the affected individuals were within normal limits.
- Accurate identification methods are essential for novel hemoglobin variants, even those with normal function.