Using digital gene expression profile to detect representational difference of Chlamys farreri genes after laboratory exposure to persistent organic pollutants
Li, J., Ocean University of China, Qingdao, China | Pan, L., Ocean University of China, Qingdao, China | Miao, J., Ocean University of China, Qingdao, China
Chlamys farreri (C. farreri), as an economic species of marine bivalves, can tolerate manifold anthropogenic stressors including persistent organic pollutants (POPs) stress. A systematic study of transcriptome after POPs exposure may provide insights into the mechanism of acquired pollution tolerance. In this study, we compared C. farreri transcriptome by reanalyzing DGE (digital gene expression) data from previous study. Our results revealed a toxicant-dependent pattern of global transcriptional responses, with 108, 126 and 138 DEGs regulated by BaP, TBBPA and PAHs cocktail (mixed by benzo(a)pyrene, benz(a)anthracene, benzo(b)fluoranthene and chrysene with the ratio of 5:3:1:1) exposure, respectively. Among these DEGs, 219 were commonly regulated by all pollutants, whereas the minority of differences were conditionspecific. In addition, we performed the first hierarchical cluster analysis of the common transcripts throughout three types of contaminants stress ulteriorly, leading to new discoveries of genes' association information with dynamical gene expression data of C. farreri, which goes beyond the focus on individuals. It revealed a cascade of gene expression patterns in the response of C. farreri to different environmental stresses and may be beneficial for further analysis of novel environmental metrics.
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