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[Biochemical basis of the ABO system subgroups]
1Institut für Medizinische Biochemie der Universität Wien, Osterreich. helmut.schenkel-brunner@univie.ac.at
Wiener Klinische Wochenschrift
|December 6, 2001
Summary
The ABO blood group system antigens are carbohydrates synthesized by glycosyltransferases. Mutations in ABO, Hh, and Sese genes explain blood group variations, including blood group O and the Bombay phenotype.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunogenetics
Context:
- The ABO blood group system is crucial in transfusion medicine and human genetics.
- Antigens are carbohydrate-based, unlike many other blood group systems.
- Glycosyltransferases play a key role in synthesizing ABO antigens.
Purpose:
- To review the biochemical and molecular basis of ABO subgroups.
- To elucidate the genetic control of ABO antigen synthesis.
- To explain the molecular mechanisms underlying blood group O and rare phenotypes.
Summary:
- ABO antigens are synthesized by glycosyltransferases encoded by the ABO, Hh, and Sese genes.
- Mutations in the ABO gene determine A or B epitope synthesis; inactive alleles result in blood group O (H-substance).
- Inactive variants of H and Sese genes cause the Bombay phenotype and non-secretor status, respectively, by preventing H-substance synthesis.
Impact:
- Provides a molecular understanding of ABO blood group diversity.
- Highlights the role of specific gene mutations in defining blood group phenotypes.
- Informs genetic counseling and understanding of transfusion reactions related to ABO subgroups.