[Molecular basis and clinical transfusion of a family with Bw subtype of ABO blood group system].
OBJECTIVE
To study a family with Bw subtype of ABO blood group system, and to review safety issues in relation with clinical transfusion.


METHODS
The molecular basis for the blood type was studied with serological assay, polymerase chain reaction-sequence specific primer (PCR-SSP) and DNA sequencing, TA clone and haplotype analysis in one blood donor whose ABO blood group were difficulty typed and her family. The bioinformatics analysis was carried out by biological analysis software to investigate the change of structure and function of enzymes influenced by the change amino acid. A retrospective survey was carried out to investigate what is the actual position that the donor blood was used in the clinical transfusion.


RESULTS
Three members from the family were found to have a Bw subtype. A substitution of nucleotide C by T at position 721 in exon 7 was discovered, which resulted in replacement of amino acid Arg to Trp. Review of clinical record suggested that there has been no significant abnormality association with past three blood transfusions.


CONCLUSIONS
A 721C>T mutation of the ABO gene probably underlies the Bw subtype. Further research is needed for understanding the clinical significance of this subtype in the blood transfusion.
Ningbo Central Blood Station, Ningbo, Zhejiang 315040, P. R. China. dgflying@gmail.com.
Gang
G
Deng
Dan-dan
DD
Huang
Wen-yu
WY
Guo
De-yi
DY
Xu
Yong
Y
Du
You-li
YL
Ma
Zhe
Z
Zhang
D000017:ABO Blood-Group System / Q000145:classification / Q000235:genetics*; D000328:Adult; D000595:Amino Acid Sequence; D001483:Base Sequence; D001803:Blood Transfusion; D005091:Exons; D005260:Female; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D010375:Pedigree; D016133:Polymerase Chain Reaction; D012189:Retrospective Studies
D000017:ABO Blood-Group System