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Molecular basis for the RhD negative phenotype in Chinese
Ching-Tien Peng1, Mu-Chin Shih, Ta-Chih Liu
1Department of Pediatrics and Laboratory Medicine, China Medical College Hospital, Taichung, Taiwan. pct@www.cmch.org.tw
International Journal of Molecular Medicine
|March 13, 2003
Summary
RhD negative variants in Taiwan are primarily due to RHD gene deletions or rearrangements. These findings highlight the limitations of standard PCR methods for identifying RhD negativity in Chinese populations.
Area of Science:
- Genetics
- Immunology
- Molecular Biology
Background:
- RhD negative individuals are rare in Taiwan, representing 0.3-0.5% of the population.
- Existing variations in Chinese RhD negative individuals lack a defined molecular basis.
Purpose of the Study:
- To investigate the molecular basis of RhD negative variants in the Taiwanese population.
- To identify and characterize the genetic changes responsible for RhD negativity.
Main Methods:
- Modified polymerase chain reaction - restriction fragment length polymorphism (PCR-RFLP) and RT-PCR were employed on 204 RhD negative DNA samples.
- Southern blot analysis was used for further characterization of representative cases.
Main Results:
- Three distinct genetic alterations were identified: RHD gene deletion (73.5%), a specific deletion between introns 8 and 9 of the RHD gene (20.1%), and genomic rearrangement resulting in a hybrid D-CE-D gene (6.4%).
- The most prevalent type involved RHD gene deletion, often with expression of ce or cE antigens.
- Standard PCR methods for differentiating D positive and D negative are unreliable in the Chinese population.
Conclusions:
- The study identified three primary genetic mechanisms causing RhD negativity in Taiwanese individuals.
- These findings underscore the need for population-specific molecular diagnostic approaches for RhD typing.
- Established PCR-based methods may not be accurate for RhD negative variant detection in Chinese populations.