Abstract
The growth and survival of cells within tissues can be affected by ‘cell competition’ between different cell clones. This phenomenon was initially recognized between wild-type cells and cells with mutations in ribosomal protein (Rp) genes in Drosophila melanogaster. However, competition also affects D. melanogaster cells with mutations in epithelial polarity genes, and wild-type cells exposed to ‘super-competitor’ cells with mutation in the Salvador–Warts–Hippo tumour suppressor pathway or expressing elevated levels of Myc. More recently, cell competition and super-competition were recognized in mammalian development, organ homeostasis and cancer. Genetic and cell biological studies have revealed that mechanisms underlying cell competition include the molecular recognition of ‘different’ cells, signalling imbalances between distinct cell populations and the mechanical consequences of differential growth rates; these mechanisms may also involve innate immune proteins, p53 and changes in translation.
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15 February 2021
A Correction to this paper has been published: https://doi.org/10.1038/s41576-020-00283-y
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Acknowledgements
The author thanks H. Buelow, S. Emmons, C. Khan, M. Kiparaki and the reviewers for comments on the manuscript and C.-H. Lee for Figure 1b. Research into cell competition mechanisms in the author’s laboratory is supported by NIH grants GM104213 and GM120451 and the Albert Einstein College Human Genetics Program.
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Nature Reviews Genetics thanks T. Igaki, L. Johnston, J.-P. Vincent and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Glossary
- Extrusion
-
The progressive ejection of a single cell from an epithelium. Extrusion usually maintains the epithelial barrier as surrounding cells close in and eventually contact one another to maintain a seal.
- Aneuploid cells
-
Cells with abnormal chromosome complements due to missing or additional copies of individual chromosomes. Aneuploid cells are found in most cancers and are a cause of birth defects and miscarriage.
- Spindle assembly checkpoint
-
A process that can arrest the cell cycle to ensure proper coupling of chromosomes to the mitotic spindle, without which chromosome segregation errors often result.
- Diamond–Blackfan anaemia
-
A dominant Mendelian disease often characterized by childhood anaemia caused in the majority of cases by heterozygous mutations or deletions affecting 1 of more than 20 ribosomal protein genes.
- Apical–basal axis
-
The distinction in epithelial cells between the apical surface that faces the exterior or lumen and the basal surface that faces the interior.
- Adhesion junctions
-
The junctions where epithelial cells bind one another through cadherin adhesion molecules expressed on each cell surface.
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Baker, N.E. Emerging mechanisms of cell competition. Nat Rev Genet 21, 683–697 (2020). https://doi.org/10.1038/s41576-020-0262-8
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