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Associated Chromosome Trap for Identifying Long-range DNA Interactions
Published on: April 23, 2011
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[Molecular biological identification of a case with A223B subtype]
Li Wang1, Qiankun Yang, Shuya Wang
1Department of Blood Transfusion, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China. kyk0418@163.com.
Summary
This study identified the molecular basis of the rare A223B subtype of the ABO blood group. A specific genetic variant (c.1055insA) was found to likely weaken A antigen expression.
Area of Science:
- Genetics
- Molecular Biology
- Immunology
Background:
- The ABO blood group system is crucial for transfusion compatibility and has various subtypes.
- Understanding the molecular basis of rare ABO blood group phenotypes is essential for accurate blood typing and transfusion practices.
Purpose of the Study:
- To elucidate the molecular genetic mechanism underlying the A223B subtype of the ABO blood group in a proband.
- To investigate the impact of identified amino acid variants on glycosyltransferase (GT) activity.
Main Methods:
- Serological ABO blood group identification using gel card and test tube methods.
- ABO gene analysis via PCR-sequence specific primers (PCR-SSP) and DNA sequencing.
- 3D molecular modeling to predict the effect of variants on α-(1→3)-D-N-acetylgalactosamine transferase (GTA) stability.
Main Results:
- The proband and family members exhibited serological characteristics of the A223B subtype.
- DNA sequencing revealed multiple heterozygous variants in the ABO gene, including c.1055insA.
- Molecular modeling indicated significant changes in the C-terminal region and stability of the A223 glycosyltransferase.
Conclusions:
- The study reveals the molecular genetic basis for the A223B blood group subtype.
- The c.1055insA variant is implicated in the reduced enzymatic activity of GTA, leading to weakened A antigen expression.
