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Advance in the Rh blood group system
1Department of Legal Medicine & Human Genetics, Jichi Medical School, Tochigi-ken, Japan.
Nihon Hoigaku Zasshi = the Japanese Journal of Legal Medicine
|May 20, 1998
Summary
The Rh blood group system involves RHD and RHCE genes. Molecular studies reveal genetic variations, including Rhnull, impacting red blood cell antigen expression and requiring co-molecules for proper function.
Area of Science:
- Genetics
- Hematology
- Molecular Biology
Background:
- The Rh blood group antigens are crucial red blood cell surface markers encoded by RHD and RHCE genes.
- Understanding the genetic basis of Rh antigens is vital for transfusion medicine and understanding related hemolytic diseases.
Purpose of the Study:
- To elucidate the molecular basis of Rh blood group antigen variations.
- To investigate the genetic factors contributing to the Rhnull phenotype and the expression of Rh polypeptides.
Main Methods:
- Sequence analysis of RHCE transcripts to identify nucleotide substitutions.
- Molecular analyses to characterize RhD and RhCE variants, including Rhnull.
- Development of polymerase chain reaction (PCR)-based Rh genotyping tests.
Main Results:
- Identified specific nucleotide substitutions in RHCE related to RhC/c and RhE/e antigens.
- Elucidated the genetic background of various RhD and RhCE variants, including Rhnull.
- Demonstrated that Rh polypeptides require co-molecules like Rh50 glycoprotein for membrane assembly, with mutations in RH50 inducing Rhnull phenotypes.
Conclusions:
- Molecular approaches have significantly advanced the understanding of the Rh blood group system and Rh polypeptides.
- The expression and function of Rh polypeptides are complex, involving multiple co-expressing factors.
- Further research is needed to fully clarify the mechanism of expression, function, and evolution of Rh polypeptides.