Abstract
Homeotic (Hox) genes specify the differential identity of segments along the body axis of insects. Changes in the segmental organization of arthropod bodies may therefore be driven by changes in the function of Hox genes1,2,3, but so far this has been difficult to demonstrate. We show here that changes in the expression pattern of the Hox genes Ubx and AbdA in different crustaceans correlate well with the modification of their anterior thoracic limbs into feeding appendages (maxillipeds). Our observations provide direct evidence that major morphological changes in arthropod body plans are associated with changes in Hox gene regulation. They suggest that homeotic changes1,4 may play a role in the normal process of adaptive evolutionary change.
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Acknowledgements
We thank M. Akam and F. Ferrari for discussion; K. Rützler and the Smithsonian Institution for hosting our collecting expeditions at Carrie Bow Caye in Belize; R. White for the FP6.87 antibody; G. Wyngaard for Mesocyclops; E. Chang for Homarus embryos; M. Sepanski for help with electron microscopy; A. Crittenden and L. Brown for technical assistance; and M. Palopoli, R. Chasan and S. Cohen for comments on the manuscript. This work was supported by the Wellcome Trust (M.A.), the Carnegie Institution of Washington, and the Howard Hughes Medical Institute (N.H.P.).
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Averof, M., Patel, N. Crustacean appendage evolution associated with changes in Hox gene expression. Nature 388, 682–686 (1997). https://doi.org/10.1038/41786
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DOI: https://doi.org/10.1038/41786
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