Requirement of successive protein syntheses for the progress of meiosis in Blepharisma |
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Authors: | E Friedl A Miyake K Heckmann |
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Institution: | 1. Unité de Recherches sur les Maladies du Métabolisme chez l''Enfant, Hôpital des Enfants malades, 75015 Paris, France;2. Department of Pediatrics, McGill University, Montreal, Canada, H3A 2B2;3. Department of Medicine, McGill University, Montreal, Canada, H3A 2B2 |
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Abstract: | Germ nuclei of Blepharisma japonicum begin meiosis within a few hours when cells of complementary mating types conjugate. We synchronized the onset of conjugation and treated cells in different stages of meiosis with 10 micrograms/ml cycloheximide which strongly inhibits protein synthesis in this ciliate. Cycloheximide arrested meiosis at six stages: I, between pairing of cells and swelling of germ nuclei; II, leptotene; III, zygotene; IV, pachytene; XI, interkinesis; XII, prometaphase II. Five of these arrests were reversible. Puromycin (250-500 micrograms/ml) also inhibited the progress of meiosis, though to lesser extents. We propose that the progression of meiosis of B. japonicum requires at least six proteins which are synthesized sequentially during meiosis. |
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Keywords: | To whom offprint requests should be addressed Address: Laboratorie de Physiologie Comparée (CNRS L A 307) Université P et M Curie 4 Place de Jussieu 752 30 Paris France |
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