Journal
MOLECULAR ECOLOGY
Volume 12, Issue 4, Pages 1031-1038Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-294X.2003.01792.x
Keywords
chimera; Dictyostelium; kin selection; multicellularity; relatedness; slime mould
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The social amoeba, Dictyostelium discoideum , produces a multicellular fruiting body and has become a model system for cell-cell interactions such as signalling, adhesion and development. However, unlike most multicellular organisms, it forms by aggregation of cells and, in the laboratory, forms genetic chimeras where there may be competition among clones. Here we show that chimera formation is also likely in nature, because different clones commonly co-occur on a very small scale. This suggests that D. discoideum will likely have evolved strategies for competing in chimeras, and that the function of some developmental genes will be competitive. Natural chimerism also makes D. discoideum a good model organism for the investigation of issues relating to coexistence and conflict between cells.
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