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© The Rockefeller University Press, 0021-9525/2001//517 $5.00
The Journal of Cell Biology, Volume 153, Number 3, , 2001 517-528

Merotelic Kinetochore Orientation Is a Major Mechanism of Aneuploidy in Mitotic Mammalian Tissue Cells

^a Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
^b Centro Genetica Evoluzionistica CNR, c/o Department of Genetics and Molecular Biology, University of Rome "La Sapienza," 4-00185 Rome, Italy
^c Division of Molecular Medicine, Wadsworth Center, New York State Department of Health, Albany, New York 12201
Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3280.(919) 962-1625(919) 962-2265

tsalmon{at}email.unc.edu

In mitotic cells, an error in chromosome segregation occurs when a chromosome is left near the spindle equator after anaphase onset (lagging chromosome). In PtK1 cells, we found 1.16% of untreated anaphase cells exhibiting lagging chromosomes at the spindle equator, and this percentage was enhanced to 17.55% after a mitotic block with 2 µM nocodazole. A lagging chromosome seen during anaphase in control or nocodazole-treated cells was found by confocal immunofluorescence microscopy to be a single chromatid with its kinetochore attached to kinetochore microtubule bundles extending toward opposite poles. This merotelic orientation was verified by electron microscopy. The single kinetochores of lagging chromosomes in anaphase were stretched laterally (1.2–5.6-fold) in the directions of their kinetochore microtubules, indicating that they were not able to achieve anaphase poleward movement because of pulling forces toward opposite poles. They also had inactivated mitotic spindle checkpoint activities since they did not label with either Mad2 or 3F3/2 antibodies. Thus, for mammalian cultured cells, kinetochore merotelic orientation is a major mechanism of aneuploidy not detected by the mitotic spindle checkpoint. The expanded and curved crescent morphology exhibited by kinetochores during nocodazole treatment may promote the high incidence of kinetochore merotelic orientation that occurs after nocodazole washout.

Key Words: aneuploidy • kinetochores • mitosis • microtubules • mitotic spindle checkpoint

© 2001 The Rockefeller University Press

Abbreviation used in this paper: 3-D, three dimensional.

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