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Characterization of Jk(a+weak): a new blood group phenotype associated with an altered JK*01 allele

BACKGROUND: The clinically important Kidd (JK) blood group system is considered to be relatively uncomplicated, both serologically and genetically. The JK*01 and JK*02 alleles give rise to Jka and Jkb antigens, respectively, and silenced alleles result in Jk(a−b−). Other inherited variants analogous to Fyx and weak D phenotypes have not been characterized for JK, although recent abstracts indicate their presence.