Hox gene duplication in fish.

The study of Hox gene clusters continues to serve as a paradigm for those interested in vertebrate genome evolution. Recent exciting discoveries about Hox gene composition in fishes challenges conventional views about vertebrate Hox gene evolution, and has initiated lively debates concerning the evolutionary events making the divergence of the major vertebrate lineages. Comparative analyses indicate that Hox cluster duplications occurred in early vertebrate evolution, and again within the order Cypriniformes of teleost fish. Loss of Hox genes was more widespread than duplication during fish evolution.

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