Abstract
The DP subregion of the human major histocompatibility complex contains two closely linked gene pairs, DP alpha, DP beta and SX alpha, SX beta. The exon-intron organization and the complete DNA sequence of the SX alpha gene are reported here. There are several mutations within the SX alpha gene which strongly suggest that it is a pseudogene. These include two frameshift mutations, one in the alpha 1 domain and the other in the cytoplasmic domain. A 5' splice site mutation at the end of the alpha 1 exon also exists. DNA sequence homology between DP alpha and SX alpha suggests that these genes arose through a gene duplication event.
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