"Indent" Formation and Mitotic Delay of Sea Urchin Eggs Fertlllzed with X-irradiated Sperms

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概要

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• When eggs of the sea urchin, Clypeaster japonicus, were fertilized with sperm irradiated with 4 kR X-rays, the first cleavage was delayed about 30 min. In addition, the disappearance of the indent and the end of the streak stage (marked by the disappearance of the nuclear membrane) were delayed by the same length as the first cleavage. From these observations, it is apparent that division delay induced by the irradiation is due to the prolongation of the streak stage. In fertilized sea urchin eggs, the prophase stage of the first cleavage is prolonged by X-irradiation and this is known as radiation-induced mitotic delay. Henshow and Yamashita et al. reported through examinations of fixed materials that both in the irradiated eggs fertilized with normal sperm and in the normal eggs fertilized with irradiated sperm, the early prophase is remarkably prolonged, but the late prophase is prolonged a little or considerably. Henshow observed that mitotic delay in the living eggs is also due to prolongation of the streak stage.

• 日本放射線影響学会の論文

著者

• 中村 泉

  東京大学理学部動物学教室

関連論文

• Change in Radiosensitivity on the Development of Sea Urchin Eggs during the Early Cleavage Stage II. Protection against X-ray lrradiation by Cysteamine
• "Indent" Formation and Mitotic Delay of Sea Urchin Eggs Fertlllzed with X-irradiated Sperms

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