Abstract
Genes controlling the cell cycle in two diatoms have been identified and functionally characterized, revealing environmental regulation of the cell cycle.
Highlights
Despite the enormous importance of diatoms in aquatic ecosystems and their broad industrial potential, little is known about their life cycle control
Annotation of the cell cycle genes in diatoms The following cell cycle gene families were selected for comprehensive analysis: cyclin-dependent kinase (CDK), cyclins, CKS1/suc1, WEE1/MYT1/MIK1, CDC25, and CDK inhibitor (CKI)
Components that were expected to be found in diatoms but could not be identified include a CDC25 phosphatase and CKIs
Summary
Despite the enormous importance of diatoms in aquatic ecosystems and their broad industrial potential, little is known about their life cycle control. They belong to the Stramenopile algae (chromists) that most probably arose from a secondary endosymbiotic process in which a red eukaryotic alga was engulfed by a heterotrophic eukaryotic host approximately 1.3 billion years ago [3,4] This event led to an unusual combination of conserved features with novel metabolism and regulatory elements, as recently confirmed by whole-genome analysis of Thalassiosira pseudonana and Phaeodactylum tricornutum [5,6,7], which are representatives of the two major architectural diatom types, the centrics and the pennates, respectively. The recent availability of genome data of T. pseudonana [5] and P. tricornutum [6] provides the basis to explore how the cell cycle machinery has evolved in diatoms
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