Abstract
More than 990 kb of the 1200 kb in the SLA class I region of the pig major histocompatibility complex (MHC) have been sequenced. The present study was designed to establish the evolution of this region which was best understood by distinguishing three periods. The most recent period, which extended from 40 to 15 mya, probably corresponded to five rounds of duplication of a basic unit. This unit consisted of a single class I gene linked to widely dispersed repeats, and one SLA-specific repeat motif. The duplications gave rise to six SLA classical class I genes. The second evolutionary period corresponded to the emergence of the SLA nonclassical class I genes, i.e. after the suidae separated from the other artiodactyl species about 65 mya. The third period appeared to correspond to a much more remote age when the ancestor of the gene SLA-11 existed. Comparative studies of the human and pig sequences of the class I-containing segments indeed revealed the presence within the human HSR1-ZNF segment of relics of a human class I fossil gene which appeared to be orthologous to the 5′ moiety of the SLA-11 pseudogene. This was the first evidence that a class I gene existed in this location at least 110-120 mya in the MHC class I region of the precursor of the mammalian species. Human/pig sequence comparison also revealed that the presumably functional pig MIC2 gene was probably orthologous to the human functional MICA or MICB genes.
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Renard, C., Chardon, P. & Vaiman, M. The Phylogenetic History of the MHC Class I Gene Families in Pig, Including a Fossil Gene Predating Mammalian Radiation . J Mol Evol 57, 420–434 (2003). https://doi.org/10.1007/s00239-003-2491-9
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DOI: https://doi.org/10.1007/s00239-003-2491-9