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Hemoglobin Saverne: a new variant with elongated beta chains: structural and functional properties
J Delanoe-Garin1, Y Blouquit, N Arous
1INSERM U.91, Hôpital Henri Mondor, Creteil, France.
Hemoglobin
|January 1, 1988
Summary
A new hemoglobin variant, Hb Saverne, was identified in a patient with Heinz body hemolytic anemia. This unstable variant has an elongated beta chain, leading to altered functional properties.
Area of Science:
- Hematology
- Molecular Biology
- Biochemistry
Background:
- Hemoglobin variants can cause hemolytic anemia.
- Identifying novel hemoglobin structures is crucial for understanding disease mechanisms.
Observation:
- A patient presented with Heinz body hemolytic anemia.
- Isoelectrofocusing revealed an abnormal hemoglobin band (35% of total).
Findings:
- Structural analysis identified a new beta-globin variant, Hb Saverne.
- Hb Saverne features an elongated C-terminal segment (156 residues) due to a His143Pro substitution.
- Functional studies indicated Hb Saverne is unstable, exhibits high oxygen affinity, and low cooperativity.
Implications:
- Hb Saverne represents a novel cause of hemolytic anemia.
- Understanding the structure-function relationship of Hb Saverne provides insights into hemoglobinopathies.
- This discovery contributes to the growing database of human hemoglobin variants.