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Genomic organization and evolutionary analysis of Ly49 genes encoding the rodent natural killer cell receptors: rapid evolution by repeated gene duplication

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Abstract

Ly49 genes regulate the cytotoxic activity of natural killer (NK) cells in rodents and provide important protection against virus-infected or tumor cells. About 15 Ly49 genes have been identified in mice, but only a few genes have been reported to date in rats. Here we studied all Ly49 genes in the entire rat genome sequence and identified 17 putative functional and 16 putative non-functional genes together with their genomic locations in a 1.8-Mb region of chromosome 4. Phylogenetic analysis of these genes indicated that the Ly49 gene family expanded rapidly in recent years, and this expansion was mediated by both tandem and genomic block duplication. The joint phylogenetic analysis of mouse and rat genes suggested that the most recent common ancestor of the two species had at least several Ly49 genes, but that the majority of current duplicate genes were generated after divergence of the two species. In both species Ly49 genes are apparently subject to birth-and-death evolution, but the birth and death rates of Ly49 genes are higher in rats than in mice. The rate of gene expansion in the Ly49 gene family in rats is one of the highest among all mammalian multigene families so far studied. The biochemical function of Ly49 genes is essentially the same as that of KIR genes in primates, but the molecular structures of the two groups of NK cell receptors are very different. A hypothesis was presented to explain the origin of the differential use of Ly49 and KIR genes in rodents and primates.

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Acknowledgements

We thank Jan Klein, Jongmin Nam, Yoshihito Niimura, and Nikolas Nikolaidis for their discussion. This work was supported by NIH grant GM20293 (to M.N.).

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  1. Department of Biology, Institute of Molecular Evolutionary Genetics, Pennsylvania State University, 208 Mueller Laboratory, University Park, PA 16802, USA

    Li Hao & Masatoshi Nei

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  1. Li Hao
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  2. Masatoshi Nei
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Correspondence to Li Hao.

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Hao, L., Nei, M. Genomic organization and evolutionary analysis of Ly49 genes encoding the rodent natural killer cell receptors: rapid evolution by repeated gene duplication. Immunogenetics 56, 343–354 (2004). https://doi.org/10.1007/s00251-004-0703-0

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