TIMING OF ORAL MORPHOGENESIS AND ITS RELATION TO COMMITMENT TO DIVISION IN PARAMECIUM-TETRAURELIA

被引:12
作者
ADL, SM [1 ]
BERGER, JD [1 ]
机构
[1] UNIV BRITISH COLUMBIA,DEPT ZOOL,6270 UNIV BLVD,VANCOUVER V6T 2A9,BC,CANADA
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/0014-4827(91)90069-7
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
The interval between commitment to division and fission in synchronous cell samples is a constant fraction of the cell cycle (0.2) in cell cycles up to 6.5 h in duration. In longer cell cycles this interval has a fixed duration of about 80 min. The point of commitment to division is associated with the six-rowed anlage stage of oral primordium development (stage V). At this stage cells carrying the cc1 mutation are not blocked by transfer to restrictive conditions but rather proceed to division. Stage V is also the stabilization point for oral anlagen. When shifted to restrictive conditions prior to this stage, development is arrested and resorption of anlagen is initiated. The cc1 mutation also blocks contractile vacuole duplication and migration under restrictive conditions. The cc1 gene function is required continuously prior to the transition point. The timing of morphogenetic stages in asynchronous cells is roughly similar to that in synchronous cells. There are, however, significant differences in timing as estimated by the two experimental procedures. © 1991.
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页码:497 / 504
页数:8
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