14-3-3σ is required to prevent mitotic catastrophe after DNA damage

Timothy A. Chan, Heiko Hermeking, Christoph Lengauer, Kenneth W. Kinzler and Bert Vogelstein ()
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Timothy A. Chan: The Johns Hopkins Oncology Center, Program in Human Genetics, and The Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine
Heiko Hermeking: The Johns Hopkins Oncology Center, Program in Human Genetics, and The Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine
Christoph Lengauer: The Johns Hopkins Oncology Center, Program in Human Genetics, and The Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine
Kenneth W. Kinzler: The Johns Hopkins Oncology Center, Program in Human Genetics, and The Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine
Bert Vogelstein: The Johns Hopkins Oncology Center, Program in Human Genetics, and The Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine

Nature, 1999, vol. 401, issue 6753, 616-620

Abstract: Abstract 14-3-3σ is a member of a family of proteins that regulate cellular activity by binding and sequestering phosphorylated proteins. It has been suggested that 14-3-3σ promotes pre-mitotic cell-cycle arrest following DNA damage, and that its expression can be controlled by the p53 tumour suppressor gene1. Here we describe an improved approach to the generation of human somatic-cell knockouts, which we have used to generate human colorectal cancer cells in which both 14-3-3σ alleles are inactivated. After DNA damage, these cells initially arrested in the G2 phase of the cell cycle, but, unlike cells containing 14-3-3σ, the 14-3-3σ-/- cells were unable to maintain cell-cycle arrest. The 14-3-3σ-/- cells died (‘mitotic catastrophe’) as they entered mitosis. This process was associated with a failure of the 14-3-3σ-deficient cells to sequester the proteins (cyclin B1 and cdc2) that initiate mitosis and prevent them from entering the nucleus. These results may indicate a mechanism for maintaining the G2 checkpoint and preventing mitotic death.

Date: 1999
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DOI: 10.1038/44188

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