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Molecular genetics of H
R Oriol1, J J Candelier, R Mollicone
1INSERM U504, Paris South University XI, Villejuif, France. oriol@infobiogen.fr
Vox Sanguinis
|August 12, 2000
Summary
The ABO, H-h, and Se-se blood group systems are genetically independent. Inactivating mutations in FUT1 and FUT2 genes, responsible for H antigen in red cells and saliva respectively, are recent and sporadic.
Area of Science:
- Human Genetics
- Immunogenetics
- Biochemistry
Background:
- The ABO, H-h, and Se-se blood group systems are crucial in transfusion medicine and diagnostics.
- Previous studies suggested potential genetic linkages between these systems.
Purpose of the Study:
- To formally investigate the genetic independence of the ABO, H-h, and Se-se systems.
- To analyze the genetic basis of H antigen expression in red cells and saliva.
Main Methods:
- Phenotypic population analysis.
- Family segregation studies of ABH-related genetic markers.
- Analysis of inactivating mutations in FUT1 and FUT2 genes.
Main Results:
- The ABO, H-h, and Se-se systems were confirmed to be genetically independent.
- FUT1 and FUT2 genes encode distinct enzymes responsible for H antigen expression in red cells and saliva, respectively.
- Inactivating mutations in FUT1 and FUT2 are primarily located in coding regions.
Conclusions:
- The genetic independence of ABO, H-h, and Se-se systems is established.
- FUT1 and FUT2 mutations are sporadic, recent, and predominantly affect gene coding regions.
- This provides a refined structural gene model for H antigen inheritance.