Minimal ProtoHox cluster inferred from bilaterian and cnidarian Hox complements

D. Chourrout (), F. Delsuc, P. Chourrout, R. B. Edvardsen, F. Rentzsch, E. Renfer, M. F. Jensen, B. Zhu, P. de Jong, R. E. Steele and U. Technau ()
Additional contact information
D. Chourrout: University of Bergen
F. Delsuc: Université Montpellier II, Place Eugène Bataillon
P. Chourrout: American Hospital of Paris
R. B. Edvardsen: University of Bergen
F. Rentzsch: University of Bergen
E. Renfer: University of Bergen
M. F. Jensen: University of Bergen
B. Zhu: Children's Hospital and Research Center at Oakland
P. de Jong: Children's Hospital and Research Center at Oakland
R. E. Steele: University of California
U. Technau: University of Bergen

Nature, 2006, vol. 442, issue 7103, 684-687

Abstract: Dividing line for Hox genes The main body axis of bilaterian animals, from insects to humans, is shaped under the instruction of the same group of genes named Hox. Understanding the evolution of Hox and the related ParaHox genes requires knowledge of the Hox complement in still more ancient lineages. Chourrout et al. have investigated Hox genes in two of these, the cnidarians Nematostella and Hydra, which arose over 600 million years ago. Although these organisms have genes that correspond with anterior-group Hox genes in bilateria, the remainder of the Hox genes show signs of an independent origin. The research also demonstrates a simple origin of the putative ancestral ProtoHox cluster, which began with just two genes. After extensive gene duplication, the Hox clusters of cnidarians and bilaterians followed independent trajectories and reached distinct fates.

Date: 2006
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DOI: 10.1038/nature04863

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