Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5764303 | Aquatic Toxicology | 2017 | 8 Pages |
â¢We analyzed whole transcriptomes upon 10 μg/L HgCl2 in seawater for 5 h.â¢101 genes in T. japonicus and 18 genes in P. annandalei were differentially regulated upon HgCl2 exposure.â¢The up-regulated genes in T. japonicus were concerned with stress, growth, and development.â¢The down-regulated ones in T. japonicus were mainly related to immune response.â¢In P. annandalei, most of up-regulated genes were involved in stress response.
Mercury (Hg) pollution is a ubiquitous and serious concern in marine environments, but the response mechanisms of marine animals to Hg pollution (i.e., toxicity/tolerance) are poorly understood. To compare the global responses of two marine copepods (Tigriopus japonicus and Pseudodiaptomus annandalei), we analyzed whole transcriptomes using RNA-seq technology in response to Hg treatment (a nominal 10 μg/L HgCl2 in seawater) for 5 h. Hg was strikingly accumulated in both copepods under treatment. The Hg concentration in P. annandalei was higher under metal exposure by approximately 1.4-fold compared with treated T. japonicus. Among transcriptomic data, 101 genes in T. japonicus and 18 genes in P. annandalei were differentially regulated in response to Hg exposure. The up-regulated genes in T. japonicus were concerned with stress, growth, and development, while the down-regulated ones were mainly related to immune response. In P. annandalei, most of the differentially expressed genes were up-regulated, and all were involved in stress response. Our work indicated that Hg exhibits endocrine-disrupting potential at the transcriptomic level in marine copepods. Overall, our study demonstrates the species-specific molecular responses of these two copepods to Hg pollution.