Unprecedented intraspecific diversity of the MHC class I region of a teleost medaka, Oryzias latipes.

Kentaro Tsukamoto, Shinpei Hayashi, Megumi Y. Matsuo, Mayumi I. Nonaka, Mariko Kondo, Akihiro Shima, Shiuchi Asakawa, Nobuyoshi Shimizu, Masaru Nonaka

研究成果: Article査読

26 被引用数 (Scopus)

抄録

The major histocompatibility complex (MHC) is present at a single chromosomal locus of all jawed vertebrate analyzed so far, from sharks to mammals, except for teleosts whose orthologs of the mammalian MHC-encoded genes are dispersed at several chromosomal loci. Even in teleosts, several class IA genes and those genes directly involved in class I antigen presentation preserve their linkage, defining the teleost MHC class I region. We determined the complete nucleotide sequence of the MHC class I region of the inbred HNI strain of medaka, Oryzias latipes (northern Japan population-derived), from four overlapping bacterial artificial chromosome (BAC) clones spanning 540,982 bp, and compared it with the published sequence of the corresponding region of the inbred Hd-rR strain of medaka (425,935 bp, southern Japan population-derived) as the first extensive study of intraspecies polymorphisms of the ectotherm MHC regions. A segment of about 100 kb in the middle of the compared sequences encompassing two class Ia genes and two immunoproteasome subunit genes, PSMB8 and PSMB10, was so divergent between these two inbred strains that a reliable sequence alignment could not be made. The rest of the compared region (about 320 kb) showed a fair correspondence, and an approximately 96% nucleotide identity was observed upon gap-free segmental alignment. These results indicate that the medaka MHC class I region contains an approximately 100-kb polymorphic core, which is most probably evolving adaptively by accumulation of point mutations and extensive genetic rearrangements such as insertions, deletions, and duplications.

本文言語English
ページ(範囲)420-431
ページ数12
ジャーナルImmunogenetics
57
6
DOI
出版ステータスPublished - 07-2005
外部発表はい

All Science Journal Classification (ASJC) codes

  • 免疫学
  • 遺伝学

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