The behaviour of kinetochore microtubules during meiosis in the fungusSaprolegnia |
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Authors: | Kenji Tanaka I Brent Heath |
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Institution: | (1) Institute of Medical Mycology, Nagoya University School of Medicine, Nagoya;(2) Department of Biology, York University, Toronto;(3) Department of Biology, York University, 4700 Keele Street, M3J 1P3 Downsview, Ontario, Canada |
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Abstract: | Summary InSaprolegnia, kinetochore microtubules persist throughout the mitotic nuclear cycle but, whilst present at leptotene, they disappear coincidently with the formation of synaptonemal complexes at pachytene and reform at metaphase I. In some other fungi chromosomal segregation is random in meiosis and non-random in mitosis. The attachment of chromosomes to persistent kinetochore microtubules in mitosis, but not meiosis, inSaprolegnia provides a plausible explanation for such behaviour. At metaphase I each bivalent is connected to the spindle by 2 laterally paired kinetochore microtubules whereas at metaphase II (as in mitosis) each univalent bears only one kinetochore microtubule, thus showing that all kinetochores are fully active at all stages of meiosis. |
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Keywords: | Kinetochores Mitosis Microtubules Meiosis Saprolegnia |
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