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Transcriptome analysis of dormant tomonts of the marine fish ectoparasitic ciliate Cryptocaryon irritans under low temperature

文献类型： 外文期刊

作者： Yin, Fei 1 ; Sun, Peng 1 ; Wang, Jiteng 2 ; Gao, Quanxin 1 ;

作者机构： 1.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Minist Agr, Key Lab East China Sea & Ocean Fishery Resources, Room 316,Bldg 6,300 Jungong Rd, Shanghai 200090, Peoples R China

2.Zhejiang Ocean Univ, Fisheries Coll, Zhoushan 316022, Zhejiang, Peoples R China

关键词： Cryptocaryon irritans;Transcriptome;Dormant tomont;Cell division;Low temperature

期刊名称：PARASITES & VECTORS （ 影响因子：3.876； 五年影响因子：3.959 ）

ISSN： 1756-3305

年卷期： 2016 年 9 卷

页码：

收录情况： SCI

摘要： Background: Cryptocaryon irritans, a species of obligatory ciliate ectoparasite, can infect various species of marine teleost fish. Cryptocaryon irritans that fall to the seabed or aquarium bottom in winter can form "dormant tomonts" and wake up when the temperature rises the next year. Abundant studies and analyses on the dormant tomonts were carried out at the transcriptome level, in order to investigate the molecular mechanism of C. irritans tomonts entering the dormant state under low-temperature conditions. Methods: The paired-end sequencing strategy was used to better assemble the entire transcriptome de novo. All clean sequencing reads from each of the three libraries (Group A: untreated blank control; Group B: treated for 24 h at 12 degrees C; and Group C: developed for 24 h at 25 degrees C) were respectively mapped back to the transcriptome assembly using the bioinformatics software. Results: In this study, 25,695,034, 21,944,467, and 28,722,875 paired-end clean reads were obtained respectively from the three cDNA libraries of the C. irritans tomont by Illumina paired-end sequencing technology. A total of 25,925 unique transcript fragments (unigenes) were assembled, with an average length of 839 bp. Differentially expressed genes (DEGs) were scrutinized; in Group B/A pairwise comparison, 343 genes presented differential expression, including 265 up-regulated genes and 78 down-regulated genes in Group B; in Group C/A pairwise comparison, there were 567 DEGs, including 548 up-regulated genes and 19 down-regulated genes in Group C; and in Group B/C pairwise comparison, 185 genes showed differential expression, including 145 up-regulated genes and 40 down-regulated genes in Group B. Conclusions: This is the first transcriptomic analytical study of the C. irritans tomonts under low temperature. It can be concluded that most of the genes required for its cell survival under low temperature, or for cell entry into a deeper dormancy state were discovered, and that they might be considered as candidate genes to develop the diagnostic and control measures for cryptocaryoniasis.

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