Sommer R J, Sternberg P W
Howard Hughes Medical Institute, California Institute of Technology, Pasadena 91125.
Science. 1994 Jul 1;265(5168):114-8. doi: 10.1126/science.8016644.
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.
在秀丽隐杆线虫中，阴门在身体中部区域由六个等效细胞中的三个形成，并由性腺诱导。然而，在一些线虫中，阴门位于身体后部区域。已经在三个这样的属中分析了阴门发育。在秀丽隐杆线虫和后阴门物种中，相同的前体细胞产生阴门，但在后者中，细胞首先向后迁移。在两个这样的物种中，阴门不是由性腺诱导的，而是依赖于前体细胞的内在特性。因此，器官位置的进化涉及诱导和感受态的变化。
