Microtubules of the kinetochore fiber turn over in metaphase but not in anaphase.
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چکیده
منابع مشابه
Microtubules of the kinetochore fiber turn over in metaphase but not in anaphase
In previous work we injected mitotic cells with fluorescent tubulin and photobleached them to mark domains on the spindle microtubules. We concluded that chromosomes move poleward along kinetochore fiber microtubules that remain stationary with respect to the pole while depolymerizing at the kinetochore. In those experiments, bleached zones in anaphase spindles showed some recovery of fluoresce...
متن کاملBiotin-tubulin incorporates into kinetochore fiber microtubules during early but not late anaphase
The dynamic behavior of kinetochore fiber microtubules has been examined in PtK1 cells during anaphase of mitosis. Cells in anaphase were injected with biotin-tubulin and, at various intervals after injection, fixed for light or electron microscopic immunolocalization of biotin-tubulin-containing microtubules. When cells in early to mid anaphase were injected with biotin-tubulin and fixed 1-2 m...
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Microtubules in the mitotic spindles of newt lung cells were marked using local photoactivation of fluorescence. The movement of marked segments on kinetochore fibers was tracked by digital fluorescence microscopy in metaphase and anaphase and compared to the rate of chromosome movement. In metaphase, kinetochore oscillations toward and away from the poles were coupled to kinetochore fiber shor...
متن کاملKinetochore microtubule dynamics and the metaphase-anaphase transition
We have quantitatively studied the dynamic behavior of kinetochore fiber microtubules (kMTs); both turnover and poleward transport (flux) in metaphase and anaphase mammalian cells by fluorescence photoactivation. Tubulin derivatized with photoactivatable fluorescein was microinjected into prometaphase LLC-PK and PtK1 cells and allowed to incorporate to steady-state. A fluorescent bar was genera...
متن کاملPoleward force at the kinetochore in metaphase depends on the number of kinetochore microtubules
To examine the dependence of poleward force at a kinetochore on the number of kinetochore microtubules (kMTs), we altered the normal balance in the number of microtubules at opposing homologous kinetochores in meiosis I grasshopper spermatocytes at metaphase with a focused laser microbeam. Observations were made with light and electron microscopy. Irradiations that partially damaged one homolog...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 1989
ISSN: 0021-9525,1540-8140
DOI: 10.1083/jcb.109.2.653