Plant Physiology 137:475-491 (2005)
© 2005 American Society of Plant Biologists
GENOME ANALYSIS-CHLAMYDOMONAS
Genome-Wide Annotation and Expression Profiling of Cell Cycle Regulatory Genes in Chlamydomonas reinhardtii1,[w]
Katerina Bisova,
Dmitri M. Krylov and
James G. Umen*
The Salk Institute for Biological Studies, La Jolla, California 92037 (K.B., J.G.U.); and National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland 20894 (D.M.K.)
Eukaryotic cell cycles are driven by a set of regulators that have undergone lineage-specific gene loss, duplication, or divergence in different taxa. It is not known to what extent these genomic processes contribute to differences in cell cycle regulatory programs and cell division mechanisms among different taxonomic groups. We have undertaken a genome-wide characterization of the cell cycle genes encoded by Chlamydomonas reinhardtii, a unicellular eukaryote that is part of the green algal/land plant clade. Although Chlamydomonas cells divide by a noncanonical mechanism termed multiple fission, the cell cycle regulatory proteins from Chlamydomonas are remarkably similar to those found in higher plants and metazoans, including the proteins of the RB-E2F pathway that are absent in the fungal kingdom. Unlike in higher plants and vertebrates where cell cycle regulatory genes have undergone extensive duplication, most of the cell cycle regulators in Chlamydomonas have not. The relatively small number of cell cycle genes and growing molecular genetic toolkit position Chlamydomonas to become an important model for higher plant and metazoan cell cycles.
1 This work was supported by generous contributions to the laboratory of J.G.U. from the H.N. and Frances C. Berger Foundation, the Joe W. and Dorothy Dorsett Brown Foundation, the Fritz B. Burns Foundation, The Arthur Vining Davis Foundations, The Lebensfeld Foundation, the John Stacy Lyons Memorial Foundation, The Gertrude E. Skelly Charitable Foundation, and the Irving A. Hansen Memorial Foundation.
[w] The online version of this article contains Web-only data.
www.plantphysiol.org/cgi/doi/10.1104/pp.104.054155.
* Corresponding author; e-mail umen{at}salk.edu; fax 858–558–6379.
Received October 1, 2004;
returned for revision November 23, 2004;
accepted November 25, 2004.
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