A novel ABO allele with a 21-bp duplication identified in two unrelated European individuals with weak A expression.
Marianne A JakobsenAnnika K HultÅsa HellbergSofia Lejon CrottetUlrik SprogøeMartin L OlssonPublished in: Transfusion medicine (Oxford, England) (2020)
In summary, we describe a novel A allele with a duplication of 21 nucleotides in exon 7 that significantly decreases the enzyme activity and leads to very weak expression of A antigen. (200 words).