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Science 1 July 1994:
Vol. 265. no. 5168, pp. 114 - 118
DOI: 10.1126/science.8016644
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Articles

Science, Vol 265, Issue 5168, 114-118
Copyright © 1994 by American Association for the Advancement of Science

articles

Changes of induction and competence during the evolution of vulva development in nematodes

RJ Sommer and PW Sternberg

Howard Hughes Medical Institute, California Institute of Technology, Pasadena 91125.

In Caenorhabditis, the vulva is formed in the central body region from three of six equivalent cells and is induced by the gonad. In some nematodes, however, the vulva is located in the posterior body region. Vulval development has been analyzed in three such genera. The same precursor cells give rise to the vulva in Caenorhabditis and in the posterior vulva species, but in the latter the cells first migrate posteriorly. In two such species, the vulva is not induced by the gonad, but instead relies on intrinsic properties of precursor cells. Thus, evolution of organ position involves changes in induction and competence.


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