High genetic diversities between isolates of the fish parasite Cryptocaryon irritans (Ciliophora) suggest multiple cryptic species

文献类型： 外文期刊

第一作者： Chi, Hongshu

作者： Chi, Hongshu;Gong, Hui;Taik, Patricia;Foley, Emily J.;Racicot, Alycia C.;Gray, Hilary M.;Guzzetta, Katherine E.;Chang, Wei-Jen;Lin, Hsin-Yun;Song, Yen -Ling;Tung, Che-Huang;Zenke, Kosuke;Yoshinaga, Tomoyoshi;Cheng, Chao-Yin;Chang, Wei-Jen;Gong, Hui

作者机构：

关键词： Cryptic species;Tetrahymena;Phylogeny;Barcoding;Variants;Cytochrome c oxidase subunit 1;Sexual reproduction

期刊名称：MOLECULAR PHYLOGENETICS AND EVOLUTION （ 影响因子：4.286； 五年影响因子：4.492 ）

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收录情况： SCI

摘要： The ciliate protozoan Cryptocaryon irritans parasitizes marine fish and causes lethal white spot disease. Sporadic infections as well as large-scale outbreaks have been reported globally and the parasite's broad host range poses particular threat to the aquaculture and ornamental fish markets. In order to better understand C irritans' population structure, we sequenced and compared mitochondrial cox-1, SSU rRNA, and ITS-1 sequences from 8 new isolates of C irritans collected in China, Japan, and Taiwan. We detected two SSU rRNA haplotypes, which differ at three positions, separating the isolates into two main groups (I and II). Cox-1 sequences also support the division into two groups, and the cox-1 divergence between these two groups is unexpectedly high (9.28% for 1582 nucleotide positions). The divergence is much greater than that detected in Ichthyophthirius multifiliis, the ciliate protozoan causing freshwater white spot disease in fish, where intraspecies divergence on cox-1 sequence is only 1.95%. ITS-1 sequences derived from these eight isolates and from all other C irritans isolates (deposited in the GenBank) not only support the two groups, but further suggest the presence of a third group with even greater sequence divergence. Finally, a small Ka/Ks ratio estimated from cox-1 sequences suggests that this gene in C. irritans remains under strong purifying selection. Taken together, the C irritans species may consists of many subspecies and/or syngens. Further work is needed to determine if there is reproductive isolation between the groups we have defined. (C) 2017 Elsevier Inc. All rights reserved.

分类号： Q349

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