Silicon Coordinates DNA Replication with Transcription of the Replisome Factors in Diatom Algae
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Transcription is a key in coordinating the action of actors involved in DNA replication. The present research characterizes the impact of silicon on transcription for selected replicative genes in two diatom microalgae: Thalassiosira pseudonana and Phaeodactylum tricornutum. We show a relationship between the RNA expression of major replicative actors and silicon concentration using q-PCR and SSH. Thanks to phylogenetical homologies with diatoms and eukaryotic genes, these results could indicate a new regulation process of cell cycle for all living beings. Our results tend to confirm initially the central role of mRNA expression control in regulating DNA replication. Silicon, as an epigenomic element, seems to impact on the expression of 15 target genes belonging to the following groups: the polymerases group, POLA2 p68 and PRIM1 p49 (DNA polymerase α/primase), DNA polymerase ε POLE1, DNA polymerase δ POLD, the PCNA sliding clamp, the ternary complex (CMG group, CDC45, subunit PSF2 of GINS, helicase subunit MCM 2,3,6), and the “maturation-promoting factor” (MPF group, CDK-A (p34cdc2). Finally, we demonstrate, by comparing the two models, that silicon promotes the expression of POLD1, POLE1, and POLE3, and PSF2 mRNA expression.
KeywordsCell cycle Silicon Epigenetic Replisome Transcription level Diatom microalgae
Mitosis promoter factor
Origin recognition complex
- P. tricornutum
Replication protein A
Quantitative reverse transcription PCR
Suppressive subtractive hybridization
- T. pseudonana
We are grateful to JGI institute for providing access to T. pseudonana genomes. We thank Dr. Chris Bowler from E.N.S. for providing us the cell strain of Phaeodactylum tricornutum, and we also thank him for associating us to the Phaeodactylum tricornutum genotyping team. We thank the cell biology department of M.M.S. laboratory from the University of Nantes, for offering us a technical assistance.
The experiments were supported by funds from the Department Biology-Health and Chemistry-Biology from University of Sciences Nantes.
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflicts of interests.
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