オーガナイザーにより誘導された二次胚の始原生殖細胞

概要

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The differentiation of tissues of the urogenital territory of the secondary embryo, which was induced by the transplantation of dorsal lips of the middle gastrula and was reared for a period of more than one month, was studied in the present study. Particularly, the differentiation of the socalled primordial germ cells was histologically traced. The primordial germ cells were discriminated in five out of eleven induced embryos. In these specimens, the secondary embryo was formed in the ventral region corresponding to the level of the ordinary gonad forming area of the host embryo. It was ascertained by the microscopic examination that the primordial germ ceils of the secondary embryo had no histological connection with that of the host, and they were induced de novo as a result of the successive induction initiated by the transplantation of organizer. Discussing on the results of the studies hitherto achieved, it was concluded that the primordial germ cells might be induced epigenetically by the synergistic inductive action of the tissue environment by the advance of the embryonic development. The present result seems to favour the opinion related by the senior author in his previous study (Asayama, '50).
社団法人日本動物学会の論文
1957-07-15