A Para-Bombay Blood Group Case Associated with a Novel FUT1 Mutation c.361G>A.
Transfus Med Hemother
; 48(4): 254-258, 2021 Aug.
Article
em En
| MEDLINE
| ID: mdl-34539321
ABSTRACT
BACKGROUND:
Here we report a case of para-Bombay phenotype due to a novel mutation FUT1 c.361G>A p.(Ala121Thr) and a nonfunctional allele FUT1*01N.13(c.881_882delTT) which showed a discrepancy in the routine ABO blood group typing. MATERIALS ANDMETHODS:
The ABO phenotype and the Lewis blood group were typed with serological methods. The ABH antigens in saliva were determined by a hemagglutination inhibition test. The CDS region of ABO, FUT1and FUT2 were amplified with polymerase chain reaction and then directly sequenced. The novel mutation was confirmed by cloning and sequencing. Three-dimensional (3-D) structural analysis of the mutant and wild-type Fut1 were performed by the Chimera software.RESULTS:
A, B and H antigens were not detected on the surface of red blood cells (RBCs) by the serological technique, and the B and H blood group substances were detected in the saliva, while the Lewis phenotype was Le(a-b+). Sequencing and cloning analysis showed the presence of a novel FUT1 mutation c.361G>A and a nonfunctional allele FUT1*01N.13(c.881_882delTT). The ABO genotype was ABO*B.01/ABO*O.01.01. The in silico analysis showed that the mutation p.(Ala121Thr) of FUT1did not change the 3-D structure of the whole enzyme but caused a certain amplitude of turnover in the loop region where Ala121 was located.CONCLUSIONS:
A novel FUT1 allele (FUT1*c.361G>A) was identiï¬ed in a Chinese individual with para-Bombay B phenotype. The FUT1c.361G>A mutation may significantly downregulate the expression of H antigens on RBCs by damaging the enzyme conformation.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Risk_factors_studies
Idioma:
En
Revista:
Transfus Med Hemother
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
China