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Genomic organization and gene evolution of two warm temperature acclimation proteins (Wap65s) of Micropterus salmoides and their responses to temperature and bacterial/viral infections

文献类型：外文期刊

第一作者： Dong, Junjian

作者： Dong, Junjian;Sun, Chengfei;Tian, Yuanyuan;Zhang, Hetong;Liu, Zhigang;Gao, Fengying;Ye, Xing;Dong, Junjian;Sun, Chengfei;Tian, Yuanyuan;Zhang, Hetong;Liu, Zhigang;Gao, Fengying;Ye, Xing;Liu, Zhigang;Gao, Fengying;Ye, Xing;Gao, Fengying;Ye, Xing

作者机构：

关键词： Micropterus salmoides; Warm temperature acclimation related 65 kDa; proteins (Wap65s); Gene evolution; Immune challenge; Hemolysis symptoms

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （影响因子：8.2；五年影响因子：7.8 ）

ISSN： 0141-8130

年卷期： 2023 年 227 卷

页码：

收录情况： SCI

摘要： Warm temperature acclimation-related 65-kDa proteins (Wap65s) are fish plasma acute-phase glycoproteins homologous to hemopexin with high affinity and clearance for heme. The study characterized Mswap65-1 and Mswap65-2 genes in Micropterus salmoides. Structural analysis showed MsWap65s contained conserved hemebinding sites. MsWap65-1 had a chloride-binding site similar to hemopexin, while MsWap65-2 had an additional calcium-binding site. Phylogenetic and Ka/Ks analysis showed that fish Wap65s were evolutionarily conserved and underwent strong purifying selection. Functional divergence analysis indicated that fish Wap65-2 retained the putative function of ancestral Wap65, while Wap65-1 underwent neofunctional differentiation. QPCR showed Mswap65s were predominantly expressed in liver, but prolonged hyperthermy inhibited Mswap652 expression. Mswap65-2 expression was up-regulated in liver and spleen after Nocardia seriolae infection, while Mswap65-1 was down-regulated. MsWap65-2 may be associated with pathogenesis and play potential role in pathogen resistance. LMBV infection resulted in both significant downregulation of Mswap65s were both significantly down-regulated, with differences observed between sexes. We speculated the immune system might suppress expression after viral infection. Exogenous rMsWap65s were prepared, and injection of rMsWap65s alleviated phenylhydrazine-induced hemolysis and inhibited increases in heme, complement C3 and inflammatory symptoms. Our results contribute to an advanced understanding of the functions and mechanisms of MsWap65s in stress resistance.

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