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Remarkable expansions of an X-linked reproductive homeobox gene cluster in rodent evolution.

Genomics. 2006 Jul;88(1):34-43. Epub 2006 Mar 30
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摘要


Rhox is a recently identified cluster of 12 X-linked homeobox genes in mice. The expression pattern of Rhox genes during postnatal testis development corresponds to their chromosomal position, much like the colinear gene regulation of the Hox gene clusters during animal embryonic development. We here report the identification of 18 additional Rhox genes and 3 pseudogenes in mice. Comparative analyses of the mouse, rat, human, dog, cow, opossum, and chicken genomes suggest that the Rhox cluster originated in the common ancestor of primates and rodents. It subsequently underwent two remarkable expansions, first in the common ancestor of mice and rats and then in mice. Positive selection promoting amino acid substitutions was detected in some young Rhox genes, suggesting adaptive functional diversification. The recent expansions of the Rhox cluster provide an opportunity to study the mechanism and origin of colinear gene regulation, but they may also undermine the utility of mouse models for understanding the development and physiology of the human reproductive system.

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