Electron-Microscopic Observation of an Ectopic PGC-like Cell in the Teleost Oryzias latipes(COMMUNICATION)(Developmental Biology)

概要

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In one specimen of newly hatched fry of the medaka, Oryzias latipes, one primordial germ cell (PGC)-like cell was found by light microscopy in the subepidermal layer of the body wall lateral to the body cavity; an ectopic site far from the gonad where the normal primordial germ cells (PGCs) were actually located. The ultrastructures of the ectopic PGC-like cell was examined by electron microscopy, and compared with those of the normal PGCs in the gonad in the same specimen. It was demonstrated that the above stated ectopic PGC-like cell, though spheroidal in shape, had striking morphological similarities without any degenerative aspect to the normal PGCs in the gonad at the ultrastructural level, especially due to the presence of two peculiar organella, i.e., the germinal dense bodies (GDB) and various lengths and forms of the sheets of agranular reticulum (AR). The present evidence suggests that the ectopic PGC-like cell in the body wall might be one of the PGCs which had settled down in the aberrant site during migration into the gonadal region in the early stages of embryogenesis, and that the PGCs or their presumed forerunners, even in the ectopic site, could differentiate themselves at least to the same developmental stage as that of the normal PGCs actually located in the gonad at the time of hatching.
社団法人日本動物学会の論文
1992-10-15