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Germ plasm in Caenorhabditis elegans, Drosophila and Xenopus Ikenishi KDev Growth Differ 1998[Feb]; 40 (1): 1-10Special cytoplasm, called germ plasm, that is essential for the differentiation of germ cells is localized in a particular region of Caenorhabditis elegans, Drosophila and Xenopus eggs. The mode of founder cell formation of germline, the origin and behavior of the germline granules, and the molecules localized in germline cells are compared in these organisms. The common characteristics of the organisms are mainly as follows. First, the founder cells of germline are established before the initiation of gastrulation. Second, the germline granules or their derivatives are always present in germline cells or germ cells throughout the life cycle in embryos, larvae, and adults. Lastly, among the proteins localized in the germ plasm, only Vasa protein or its homolog is detected in the germline cells or germ cells throughout the life cycle. As the protein of vasa homolog has been reported to be also localized in the germline-specific structure or nuage in some of the organisms without the germ plasm, the possibility that the mechanism for differentiation of primordial germ cells is basically common in all organisms with or without the germ plasm is discussed.|*Cytoplasm[MESH]|*Xenopus laevis[MESH]|Animals[MESH]|Caenorhabditis elegans/*cytology[MESH]|Drosophila melanogaster/*cytology[MESH]|Germ Cells/*cytology[MESH]|Proteins/analysis[MESH]|RNA, Messenger/analysis[MESH] |
