Distribution of Cdc14 Through Evolution
Cdc14 is widely distributed, being found in most eukaryote kingdoms. However, it is not found in all species based on searches of sequenced genomes. One or more Cdc14 genes are found in alveolates, animals, fungi, trypanosomes, and lower plants. However, Cdc14 genes have apparently been lost in some lineages, including higher plants, rhodophytes, and slime molds. There is a fairly tight positive correlation between the presence of Cdc14 in a species and whether that species makes flagella or cilia. This may be related to the ancestral role of Cdc14. Whether flagella-anchoring basal bodies or centrioles involved in mitosis appeared first during evolution has been debated, but one theory is that flagella evolved first as a motility and sensory organelle, and the basal body was later co-opted into a mitotic role. The function of Cdc14 may have adapted to different functions during the evolution of those organelles.
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