Identification of two novel FUT1 mutations in people with Bombay phenotype from Iran

Abstract

Background and purpose: Bombay and Para-Bombay phenotypes are characterized by FUT1 gene mutation and lack of H antigen expression in red blood cells. ABH antigens are not present in the body secretions of Bombay individuals, while they are expressed in the secretions of para-Bombay. The aim of this study was to investigate the molecular basis of FUT1 and FUT2 genes in Iranians with the Bombay or Para-Bombay phenotype.

Materials and methods: ABO phenotype analysis and routine serological tests were performed on 11 people with Bombay and Para-Bombay phenotypes. The coding regions of FUT1 and FUT2 genes were amplified by PCR followed by sequencing. The ABO genotypes were also determined by sequencing exons 6 and 7 of the ABO gene.

Results: Serological investigations confirmed the Bombay phenotype in 8 samples and the Para-Bombay phenotype in 3 samples. Family members with the Bombay phenotype had the classic c 0.725 T > G mutation in the FUT1 gene, accompanied by deletion of the FUT2 gene. Other samples had c.653 A>G, c 0.661 C>T, c 0.652 C>G, and c.722 A>C mutations in the FUT1 while FUT2 was silenced by c 0.461 G>A.

Conclusion: In this research, we identified two novel mutations in the FUT1 gene in individuals with the Bombay phenotype. This and previous works confirm the variety of FUT1 mutations.

Keywords: Bombay phenotype; FUT1; FUT2; H antigen; Para-Bombay phenotype.