DOA sequences are currently known to have identical protein sequences. However, in this study, we report four novel allele types of human leucocyte antigen-DOA, including one synonymous and three non- synonymous amino acid changes from the Korean population. DOA*010106 has identical protein sequence with previously known DOA*010103 except one nucleotide difference at codon 45 (TCG-->TCA). In contrast, DOA*0102 and DOA*0103 have a sequence change at codon 99 (CTG-->GTG) and codon 105 (CGC-->TGC), causing non-synonymous amino acid changes, Leu99Val and Arg105Cys, respectively. In addition, DOA*0104N has a sequence deletion at codon 36 (CCC-->CC-), resulting in a frame shift leading to a stop codon at codon 62.