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[Structural variants in hemoglobin occurring in the Czech Republic]

K Indrák¹, V Brabec, V Divoký

¹Hematologická klinika FN a LF UP, Olomouc.

Vnitrni Lekarstvi

|January 1, 1995

Summary

This review details seven structural hemoglobin variants in the Czech Republic, including newly identified unstable Hb-Hradec Králové and high-affinity Hb-Olomouc, highlighting diagnostic challenges and clinical impacts.

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Area of Science:

Hematology
Molecular Genetics
Clinical Medicine

Background:

Review of diagnosed structural hemoglobin variants in the Czech Republic.
Focus on unstable hemoglobin variants and their clinical presentation.
Introduction of novel hemoglobin variants identified within the country.

Observation:

Hb-Hradec Králové (Hb-HK) is a newly detected unstable variant, challenging traditional diagnosis.
Hb-HK instability leads to thalassaemic features and Heinz body formation.
Hb-Olomouc, a high-oxygen-affinity variant, causes erythrocytosis in familial cases.
Hb-M Milwaukee presents with hemolysis and Heinz bodies rather than cyanosis.

Findings:

Seven structural hemoglobin variants identified, with unstable types being most frequent.

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Hb-Hradec Králové (alpha 2 beta 2 115 (G17) Ala-Asp) requires molecular genetic diagnosis.

Hb-Olomouc (alpha 2 beta 2 86 (F2) Ala-Asp) is associated with erythrocytosis.

Hb-M Milwaukee (alpha 2 beta 2 67 (E11) Val-Glu) manifests as hemolysis.

Implications:

Highlights the need for advanced diagnostic methods for unstable hemoglobinopathies.
Suggests potential for novel therapeutic targets for hemoglobin variants.
Underscores the importance of molecular diagnostics in identifying rare hemoglobin disorders.
Provides insights into the clinical spectrum of hemoglobin variants in a specific geographic region.