Functional identification of ToLAAO genes and polymorphism association analysis of Cryptocaryon irritans resistance in Trachinotus ovatus

文献类型： 外文期刊

第一作者： Guo, Liang

作者： Guo, Liang;Zhu, Ke-Cheng;Guo, Hua-Yang;Liu, Bao-Suo;Zhang, Nan;Jiang, Shi-Gui;Zhang, Dian-Chang;Guo, Liang;Zhu, Ke-Cheng;Guo, Hua-Yang;Liu, Bao-Suo;Zhang, Nan;Jiang, Shi-Gui;Zhang, Dian-Chang;He, Pei-Ying;Zhang, Dian-Chang;Zhang, Dian-Chang;Zhang, Dian-Chang

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关键词： Cryptocaryon irritans; SNP; ToLAAO; ToLAAO-like; Trachinotus ovatus

期刊名称：AQUACULTURE RESEARCH （ 影响因子：2.082； 五年影响因子：2.415 ）

ISSN： 1355-557X

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收录情况： SCI

摘要： 'Marine white spot disease' is caused by Cryptocaryon irritans infection and can lead to high mortality in Trachinotus ovatus. L-Amino acid oxides (LAAOs) play a key role in antibacterial activity and parasitic activity. To investigate the function of the LAAO (ToLAAO) and LAAO-like (ToLAAO-like) genes of T. ovatus, this study explored the sequence characteristics and relationship between polymorphisms and traits of anti-C. irritans. The ToLAAO and ToLAAO-like ORF sequences obtained from the whole genome of T. ovatus were 1563 and 1584 bp, which encoded 520 and 527 amino acids respectively. Both sequences contained a highly conserved flavin adenine dinucleotide-binding domain and a similar amino oxidase domain. Sequence multiple alignment analysis showed that ToLAAO and ToLAAO-like had the highest homology to the LAAO sequence of Larimichthys crocea. Quantitative real-time polymerase chain reaction (qRT-PCR) results showed that ToLAAO and ToLAAO-like mRNA were generally expressed in 10 tissues. ToLAAO mRNA was highly expressed in the testis, while ToLAAO-like mRNA was highly expressed in muscle tissue. After C. irritans infection, ToLAAO and ToLAAO-like mRNA were significantly upregulated in the skin and spleen, while only ToLAAO mRNA was significantly upregulated in the liver and head kidney, and only ToLAAO-like mRNA was significantly upregulated in the gills. Five SNP sites were identified from the ToLAAO and ToLAAO-like genomic sequence fragments, and two sites (6200C/T and 6237G/A) of LAAO were significantly associated with resistance to C. irritans. These results suggest that ToLAAO and ToLAAO-like genes play crucial roles in defending against the immune response to C. irritans.

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