大菱鲆清道夫受体家族鉴定及对鳗弧菌感染的响应
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青岛农业大学海洋科学与工程学院

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S942.1

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山东省鱼类产业技术体系(SDAIT-12-02)


Identification of scavenger receptor family in turbot (Scophthalmus maximus) and its response to Vibrio anguillarum infection
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School of Marine Science and Engineering,Qingdao Agricultural University

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    摘要:

    清道夫受体(Scavenger receptors,SRs)是由一类结构各异功能多样的跨膜表面糖蛋白分子组成的蛋白质家族,在免疫防御、炎症调控及组织稳态中发挥关键作用。目前尚未有研究系统性的对大菱鲆(Scophthalmus maximus)清道夫受体基因家族进行鉴定和探究其在免疫反应中的作用。为了系统鉴定大菱鲆清道夫受体基因家族,并探究其在鳗弧菌(Vibrio anguillarum)侵染过程中的作用。本研究基于大菱鲆基因组数据库,通过生物信息学的方式,对大菱鲆清道夫受体家族成员进行鉴定,通过结构域、系统发育分析,对大菱鲆清道夫受体基因进行注释确认。利用实时荧光定量聚合酶链式反应(qPCR)分析大菱鲆清道夫受体在健康大菱鲆的8种组织(血液、皮肤、鳃、肝脏、脾脏、肠道、头肾和脑)中的表达量,以及在鳗弧菌感染初期,大菱鲆清道夫受体基因在黏膜组织(鳃、皮肤和肠道)中的表达模式差异。结果显示,在大菱鲆中共鉴定得到16个清道夫受体基因。除mrc1a在肝脏中和ldlr在血液中未检测到表达,所选择的清道夫受体在健康大菱鲆8个组织中均广泛表达。在鳗弧菌感染初期,大菱鲆3个黏膜组织中scara4与scarf1在各检测时间点均呈现上调趋势;其余10个清道夫受体则在不同组织及感染后的不同时间点表现出差异化的表达特征,例如scara2/marco与scarf2在感染后各时间点的皮肤组织中均显著上调,而scarb1在感染后各时间点的肠道组织中均显著下调。研究结果提示,大菱鲆黏膜组织中的清道夫受体基因在应对鳗弧菌感染的过程中,在不同组织中发挥着各不相同的功能作用。本研究结果为抗病性状分子遗传机制的解析提供了参考。

    Abstract:

    Scavenger receptors (SRs) are a family of structurally diverse and functionally versatile transmembrane glycoproteins molecules that play critical roles in immune defense, inflammatory regulation, and tissue homeostasis. Currently, no studies have systematic identified the scavenger receptor gene family in turbot (Scophthalmus maximus) and explored its role in the immune response. To systematically identify the scavenger receptor gene family in turbot and explore their functions during Vibrio anguillarum infection. This study conducted a genome-wide identification of scavenger receptor family members in turbot based on its genomic database using bioinformatics approaches. Annotation and confirmation of these genes were performed through domain analysis and phylogenetic analysis.The tissue distribution of scavenger receptor genes was analyzed in eight healthy turbot tissues (blood, skin, gill, liver, spleen, intestine, head kidney, and brain) using Quantitative Real-time polymerase chain reaction (qPCR). Additionally, their expression patterns in mucosal tissues (gill, skin, and intestine) were examined during the early stages of V. anguillarum infection. The results show a total of 16 scavenger receptor genes were identified in turbot. With the exception of mrc1a, which was undetectable in the liver, and ldlr, which was not expressed in blood, the selected scavenger receptors were widely expressed across all eight tissues in healthy turbot. In the early stage of V. anguillarum infection, scara4 and scarf1 in the three mucosal tissues of turbot showed an upward trend at each detection time point. The remaining 10 scavenger receptors exhibited differentiated expression characteristics in different tissues and at different time points after infection. For instance, scara2/marco and scarf2 were significantly upregulated in skin tissues at each time point after infection, while scarb1 was significantly downregulated in intestinal tissues at each time point after infection. These findings suggest that scavenger receptor genes in turbot mucosal tissues play distinct functional roles in response to V. anguillarum infection across different tissues. The results of this study provide a reference for analyzing the molecular genetic mechanism of disease-resistant traits.

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  • 收稿日期:2025-12-30
  • 最后修改日期:2026-01-16
  • 录用日期:2026-01-16
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