Journal
JOURNAL OF CELL BIOLOGY
Volume 185, Issue 6, Pages 934-937Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200905098
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Impaired mitotic checkpoint signaling can both promote and suppress tumors. The mitotic checkpoint targets Cdc20, the specificity factor of the ubiquitin ligase that promotes anaphase by targeting cyclin B and securin for destruction. In this issue, Li et al. (2009. J. Cell Biol. doi: 10.1083/jcb. 200904020) use gene replacement to produce mice expressing a Cdc20 mutant that cannot be inhibited by the mitotic checkpoint. In addition to the expected aneuploidy, these animals have a high tumor incidence that is likely caused by persistent aneuploidy coupled with nonmitotic functions of mutant Cdc20.
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