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[Molecular genetic analysis for the A3 alleles]
Qiong Yu1, Yan-Lian Liang, Zhi-Hui Deng
1Shenzhen Blood Center, Shenzhen Institute of Transfusion Medicine, Shenzhen 518035, China.
Zhongguo Shi Yan Xue Ye Xue Za Zhi
|March 8, 2005
Summary
Investigating A(3) blood subgroups revealed diverse genetic backgrounds. A specific mutation (838C-->T) in the A(3)B subgroup may explain its low glycosyltransferase activity.
Area of Science:
- Immunogenetics
- Molecular Biology
- Blood Group Serology
Background:
- A(3) is a rare blood subgroup with variable serological identification.
- Understanding the molecular basis of rare blood subgroups is crucial for transfusion medicine.
Purpose of the Study:
- To investigate the molecular genetic background of A(3) and A(3)B blood subgroups.
- To identify genetic variations associated with the A(3) phenotype.
Main Methods:
- Serological testing to identify A(3) subgroup samples.
- Genotyping using Polymerase Chain Reaction-Sequence Specific Primers (PCR-SSP).
- Nucleotide sequencing of ABO locus exons and introns.
Main Results:
- Identified common A102 and O1-2 alleles in two A(3) subgroups.
- Found common A102 and rare O(1v)-4 alleles in another A(3) subgroup.
- Discovered a synonymous substitution (838C-->T) in the A(3)B subgroup, predicting a Leu280Phe alteration.
Conclusions:
- The molecular genetic background of A(3) phenotypes is polymorphic.
- The 838C-->T missense mutation may be responsible for the A(3)B subgroup's low glycosyltransferase activity.