oncogenic stress. The Hzf protein is encoded by a p53-responsive gene, and its
overexpression, either in cells retaining or lacking functional 53, halts their proliferation.
Enforced expression of Hzf led to the appearance of tetraploid cells with supernumerary
centrosomes and, ultimately, to cell death. Eliminating Hzf mRNA expression by use of short
hairpin (sh) RNAs had no overt effect on unstressed cells but inhibited the maintenance of G …