Discovery of an ancient MHC category with both class I and class II features

Kazuhiko Okamura, Johannes M. Dijkstra, Kentaro Tsukamoto, Unni Grimholt, Geert F. Wiegertjes, Akiko Kondo, Hisateru Yamaguchi, Keiichiro Hashimoto

研究成果: ジャーナルへの寄稿学術論文査読

7 被引用数 (Scopus)


Two classes of major histocompatibility complex (MHC) molecules, MHC class I and class II, play important roles in our immune system, presenting antigens to functionally distinct T lymphocyte populations. However, the origin of this essential MHC class divergence is poorly understood. Here, we discovered a category of MHC molecules (W-category) in the most primitive jawed vertebrates, cartilaginous fish, and also in bony fish and tetrapods. W-category, surprisingly, possesses class II–type α- and β-chain organization together with class I–specific sequence motifs for interdomain binding, and the W-category α2 domain shows unprecedented, phylogenetic similarity with β2-microglobulin of class I. Based on the results, we propose a model in which the ancestral MHC class I molecule evolved from class II–type W-category. The discovery of the ancient MHC group, W-category, sheds a light on the long-standing critical question of the MHC class divergence and suggests that class II type came first.

ジャーナルProceedings of the National Academy of Sciences of the United States of America
出版ステータス出版済み - 21-12-2021

All Science Journal Classification (ASJC) codes

  • 一般


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