Uncoupling of basal body duplication and cell division in crochu, a mutant of Paramecium hypersensitive to nocodazole.

In Paramecium the development of cell shape and surface pattern during division depends on a precise spatial and temporal pattern of duplication of the ciliary basal bodies which are the organizers of the cortical cytoskeleton. According to their localization, basal bodies will duplicate once, more than once or not all and this duplication is coupled with cell division, as is centrosomal duplication in metazoan cells. We describe here a monogenic nuclear recessive mutation, crochu1 (cro1), resulting in abnormal cell shape and cortical pattern and hypersensitivity to nocodazole. The cytological analysis, by immunofluorescence and electron microscopy, demonstrates that the mutation causes hyper duplication of basal bodies and releases both spatial and temporal control of duplication as basal bodies continue to proliferate in interphase and do so at ectopic locations, beneath the surface and in cortical territories where no duplication occurs in the wild type. However, the abnormal surface organization of cro1 cells does not affect the program of basal body duplication during division. By genetic analysis, no interaction was detected with the sm19 mutation which impairs basal body duplication. In contrast, the cro1 mutation suppresses the nocodazole resistance conferred by nocr1, a mutation in a beta-tubulin gene. This interaction suggests that the primary effect of the mutation bears on microtubule dynamics, whose instability, normally increased during division, would persist throughout the interphase and provide a signal for constitutive basal body duplication.