Abstract
Genetic studies have identified over a dozen genes that function in programmed cell death (apoptosis) in the nematode Caenorhabditis elegans1,2,3. Although the ultimate effects on cell survival or engulfment of mutations in each cell death gene have been extensively described, much less is known about how these mutations affect the kinetics of death and engulfment, or the interactions between these two processes. We have used four-dimensional-Nomarski time-lapse video microscopy to follow in detail how cell death genes regulate the extent and kinetics of apoptotic cell death and removal in the early C. elegans embryo. Here we show that blocking engulfment enhances cell survival when cells are subjected to weak pro-apoptotic signals. Thus, genes that mediate corpse removal can also function to actively kill cells.
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Acknowledgements
We thank P. Reddien and R. Horvitz for sharing results before publication, and G. Chimini, V. Fadok, N. Franc, R. Lang, J. Savill, P. Williamson, and members of the Hengartner laboratory for useful comments. This work was supported by an NIH grant and a research grant from Devgen NV to M.O.H.
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Movie 1. Wild type Grandmother (ABalppaa)
Unlike mitoses leading immediately to a dying cell, most mitoses produce two daughters of approximately equivalent size, as shown here.
Movie 2. Wild type (ABalppaap)
Demonstrates normal birth, onset, death and engulfment
Movie 3. ced-7(n1892) (ABprpppapp)
Demonstrates birth, onset, death and delayed engulfment
Movie 4. ced-3(op149) (ABplpppapp)
Demonstrates birth, onset, reversion, no death, no engulfment, ectopic mitosis
Movie 5. ced-7(n1892); ced-3(op149) (ABplpappap)
Demonstrates birth, no death, no engulfment
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Hoeppner, D., Hengartner, M. & Schnabel, R. Engulfment genes cooperate with ced-3 to promote cell death in Caenorhabditis elegans. Nature 412, 202–206 (2001). https://doi.org/10.1038/35084103
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DOI: https://doi.org/10.1038/35084103
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