Nuclear shaping in spermatids of the Thai leaf frog Megophrys montana
Tóm tắt
Transmission electron microscopy of Thai leaf frog testis revealed a unique pattern of spermatid nuclear morphogenesis. Chromatin condenses into a continuous cylindrical coil within a roughly spherical nucleus. Later the nuclear membrane conforms to the contours of the uncoiling nuclear contents. In the mature sperm, the long, tapering nuclesus is helically shaped. This developmental sequence occurs in the absence of a microtubular manchette, raising questions about the role of this structure in nuclear shaping in spermatozoa of other species.
Từ khóa
Tài liệu tham khảo
Afzelius B. A., 1982, Spermiogenesis and testicular spermatozoa of the olive baboon (Papio anubis), J. Submicrosc. Cytol., 14, 627
Kessel R. G., 1970, Comparative Spermatology, 531
Ploen L., 1986, Comparative aspects of mammalian spermiogenesis, Scan. Electron Microsc., 2, 639
Porter K. R., 1965, Ideas in Modern Biology, 95