Abstract
Chloroplasts were originally established in eukaryotes by the endosymbiosis of a cyanobacterium; they then spread through diversification of the eukaryotic hosts and subsequent engulfment of eukaryotic algae by previously nonphotosynthetic eukaryotes. The continuity of chloroplasts is maintained by division of preexisting chloroplasts. Like their ancestors, chloroplasts use a bacterial division system based on the FtsZ ring and some associated factors, all of which are now encoded in the host nuclear genome. The majority of bacterial division factors are absent from chloroplasts and several new factors have been added by the eukaryotic host. For example, the ftsZ gene has been duplicated and modified, plastid-dividing (PD) rings were most likely added by the eukaryotic host, and a member of the dynamin family of proteins evolved to regulate chloroplast division. The identification of several additional proteins involved in the division process, along with data from diverse lineages of organisms, our current knowledge of mitochondrial division, and the mining of genomic sequence data have enabled us to begin to understand the universality and evolution of the division system. The principal features of the chloroplast division system thus far identified are conserved across several lineages, including those with secondary chloroplasts, and may reflect primeval features of mitochondrial division.
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Acknowledgements
I am deeply indebted to Dr. Tsuneyoshi Kuroiwa (Rikkyo University) and past and present members of his laboratory for their guidance. I am also grateful to Dr. Katherine W. Osteryoung (Michigan State University) and past and present members of her laboratory for the opportunity to pursue further studies. I also thank Dr. C. Peter Wolk (Michigan State University) and members of his laboratory for helpful discussions about cyanobacteria. I also thank Mary Fantacone for editorial help. A portion of my study is supported by a JSPS (Japan Society for the Promotion of Science) Postdoctoral Research Fellowship for Research Abroad to S.M.
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Shin-ya Miyagishima is the recipient of the Botanical Society Award for Young Scientists, 2004.
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Miyagishima, Sy. Origin and evolution of the chloroplast division machinery. J Plant Res 118, 295–306 (2005). https://doi.org/10.1007/s10265-005-0226-2
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DOI: https://doi.org/10.1007/s10265-005-0226-2