Human histo-blood group A2 transferase coded by A2 allele, one of the A subtypes, is characterized by a single base deletion in the coding sequence, which results in an additional domain at the carboxyl terminal.

Abstract excerpt

We have identified a possible mutation which characterizes A2 alleles (a minor subtype of A) at the human histo-blood group ABO locus based on polymerase chain reaction (PCR) of genomic DNA, followed by nucleotide sequencing of the amplified fragments. The A2 subtype has a single base deletion near the carboxyl terminal. As a result of frame-shifting, A2 transferase possesses an extra domain. Introduction of this...

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