Molecular genetic analysis of <scp>ABO</scp> blood group variations reveals 29 novel <scp>ABO</scp> subgroup alleles

Abstract

Twenty-nine ABO subgroup alleles were newly linked to different kinds of ABO variations. We provide the first evidence that promoter abnormality is involved in the formation of weak ABO phenotypes. We also described the first naturally occurring ABO alleles with premature terminal codons in the 5'-region that led to Ael and Bel phenotypes.