Cancer Cell Biology: Myc Wins the Competition

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Cancer Cell Biology: Myc Wins the Competition Timothy D. Donaldson, Robert J. Duronio  Current Biology  Volume 14, Issue 11, Pages R425-R427 (June 2004) DOI: 10.1016/j.cub.2004.05.035

Figure 1 High levels of Myc result in a competitive advantage. A diagram of a Drosophila wing disc, which is a single layer of undifferentiated epithelial cells. In the ‘three clone’ assay [7], a mitotic recombination event induced early during wing disc development creates two clones of cells, one with wild-type levels of Myc (red) juxtaposed to one expressing higher levels of Myc (green). A separate recombination event elsewhere in the disc generates a neutral clone (blue), also marked and expressing a wild-type level of Myc. As the clones were induced simultaneously, the growth rates – clone size at the end of the experiment – of each group of cells can be compared. The Myc over-expressing clone (green) is larger than the neutral clone (blue), indicating that increasing the level of Myc increases growth rate. Clones expressing a wild-type level of Myc (red) adjacent to Myc over-expressing clones are the smallest, indicating that Myc over-expression is capable of impeding the growth of nearby cells. This occurs because the Myc over-expressing cells induce apoptosis in neighboring cells with a lower level of Myc. Thus, Myc over-expression makes cells act as ‘super competitors’. Current Biology 2004 14, R425-R427DOI: (10.1016/j.cub.2004.05.035)