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Understanding of the molecular responses underpinning diatom responses to ocean acidification is fundamental for predicting how important primary producers will be shaped by the continuous rise in atmospheric CO 2 . In this study, we have analyzed global transcriptomic changes of the model diatom  Phaeodactylum tricornutum  following growth for 15 generations in elevated  p CO 2  by strand-specific RNA sequencing (ssRNA-seq). Our results indicate that no significant effects of elevated  p CO 2  and associated carbonate chemistry changes on the physiological performance of the cells were observed after 15 generations whereas the expression of genes encoding histones and other genes involved in chromatin structure were significantly down-regulated, while the expression of transposable elements (TEs) and genes encoding histone acetylation enzymes were significantly up-regulated. Furthermore, we identified a series of long non-protein coding RNAs (lncRNAs) specifically responsive to elevated  p CO 2 , suggesting putative regulatory roles for these largely uncharacterized genome components. Taken together, our integrative analyses reveal that epigenetic elements such as TEs, histone modifications and lncRNAs may have important roles in the acclimation of diatoms to elevated  p CO 2  over short time scales and thus may influence longer term adaptive processes in response to progressive ocean acidification.

A Potential Role for Epigenetic Processes in the Acclimation Response to Elevated pCO2 in the Model Diatom Phaeodactylum tricornutum