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七带石斑鱼神经坏死病毒的RT—LAMP检测方法

2016-06-29刘滨刘新富曾霖孟振刘江春

天津农业科学 2016年7期
关键词:检测

刘滨++刘新富++曾霖++孟振++刘江春

摘 要:报道了一种可以快速、灵敏地检测七带石斑鱼神经坏死病毒(NNV)的逆转录环介导等温扩增方法(RT-LAMP)。该方法参考赤点石斑鱼NNV病毒的主衣壳蛋白(MCP)基因的保守序列,设计1对引物克隆出七带石斑鱼NNV的基因序列,利用Primer Explorer V4 软件设计了3对针对所克隆NNV基因序列的特异性引物,建立了RT-LAMP的反应体系,并分别对反应系统的引物浓度、反应温度和时间进行了优化,形成了七带石斑鱼NNV病毒RT-LAMP检测技术。实践应用结果表明,在63 ℃的最佳反应温度下,采用RT-LAMP检测技术经过45 min就能完成一次检测,准确率达到100 %。本研究建立的RT-LAMP检测NNV技术设备要求简单,为七带石斑鱼等石斑鱼无NNV受精卵和仔稚鱼的生产现场检测和筛选提供了一种方便、灵敏的检测方法。

关键词:七带石斑鱼;神经坏死病毒;检测;RT-LAMP

中图分类号:S941 文献标识码:A DOI 编码:10.3969/j.issn.1006-6500.2016.07.006

Abstract:A rapid and sensitive technique for detecting of Nervous Necrosis Virus in seven-band grouper was developedthrough reverse transcriptase loop-mediated isothermal amplification(RT-LAMP) method. A set of six specific primers were designed based on MCP gene of Red-spotted Grouper Nervous Necrosis Virus ( RGNNV) using Primer Explorer V3 software. The parameters of primer concentration, reaction time and temperature were optimized.The RT-LAMP method established in this article was applied to detect nervous necrosis virus of seven-band grouper larvae in the fish farming field, the results showed that the sensitivity of RT-LAMP method was consistent with the nested RT-PCR method, as well as the detection result of RT-LAMP method could be easily determinate,andthe detection time was short, which can be completed within 2 hours. The RT-LAMP assay developed in this article wasvery suitable for rapid diagnosis of early NNV infection of seven-band grouper larvae in fish farming field.

Key words: seven-band grouper (Epinephelus septemfasciatus); nervous necrosis virus ( NNV); detection; reverse transcriptase loop-mediated isothermal amplification (RT-LAMP)

七带石斑鱼(Epinephelus septemfasciatus Thunberg,1793)是我国沿海分布纬度最高的石斑鱼种类,除了具有个体大、生长速度快和经济价值高等特点外,对低温的耐受能力较强,生存水温9~34 ℃,摄食水温12~32 ℃,有“冷水石斑”之称,被认为是东北亚温带海域网箱养殖理想海水鱼类品种之一[1],其苗种繁育技术的突破,可以缓解我国东海北部和黄渤海沿岸网箱适养鱼类品种缺乏的问题,因此备受业界重视。但是尽管国内外研究多年,七带石斑鱼的苗种繁育技术始终不能稳定,在所面临的技术瓶颈中,神经坏死病毒(nervous necrosis virus,NNV)造成的早期苗种死亡率居高不下是目前最亟待解决的关键问题。……

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