乌鳢感染A.veronii差异基因的筛选及代表性基因在体内表达规律研究
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摘要
乌鳢作为食补与药补于一身的名贵鱼类,在我国深受广大消费者的喜爱。近年来,随着乌鳢养殖面积的增加、集约化养殖的发展,其病害也逐年增多,尤其是细菌性疾病日趋严重,已成为制约乌鳢养殖业健康可持续发展的重大障碍。目前,有关乌鳢细菌性疾病的治疗多采用投喂抗生素的方法,但此方法易导致乌鳢体内药物残留以及细菌耐药性增加。研发新型无毒渔药与利用免疫相关基因进行抗病品系选育是乌鳢养殖业健康可持续发展的趋势,因此,必须对乌鳢抗病免疫相关基因及免疫机理进行深入研究。
     本研究应用SSH技术,成功构建维氏气单胞菌感染后的乌鳢头肾SSH cDNA文库,并经筛选、测序,获得有效序列202条,其中,73个序列未搜到同源性,其余129条序列按可能功能共分为6大类,免疫相关基因序列25条,占总数的13%。
     在乌鳢头肾SSH cDNA文库的基础上,从中选出疑似Cu/Zn-SOD、Rac2、MPO的基因片段,并利用RACE技术获得了三种免疫相关基因的全长cDNA序列,采用生物信息学方法对其理化性质、蛋白结构及氨基酸同源性进行了分析;用实时荧光定量PCR技术分析了免疫相关基因在健康乌鳢的不同组织中表达分布以及感染维氏气单胞菌后的表达变化。结果显示:
     Cu/Zn-SOD基因全长cDNA序列810bp,其ORF465bp、编码154个氨基酸;多重序列比较分析,Cu/Zn-SOD氨基酸序列与莫桑比克罗非鱼同源性为95%;实时荧光定量PCR分析表达显示:Cu/Zn-SOD基因在健康乌鳢的头肾、肾、鳃、心、脾、肝、肌肉、肠等八个组织中均有表达,肝脏中的表达量最高;感染维氏气单胞菌后,其在不同组织中的表达量变化大致呈现:先上升后下降并维持一段时间,后又有上升的趋势。
     Rac2基因全长cDNA序列1179bp,其ORF579bp、编码192个氨基酸;通过氨基酸序列比较分析,各物种Rac2高度同源;实时荧光定量PCR分析表达显示:Rac2基因在健康乌鳢的头肾、肾、鳃、心、脾、肝、肌肉等七个组织中均有表达,不在肠中表达,其中,头肾表达量最高;感染维氏气单胞菌后,Rac2在乌鳢7个组织中的表达量,随感染时间不同而发生变化,但均在感染后的36h时,表达量上调,基本超过0h时的表达量。
     MPO基因全长cDNA序列3181bp,其ORF2301bp、编码766个氨基酸;通过氨基酸序列比较分析,各物种MPO蛋白存在歧化;实时荧光定量PCR分析表达显示:MPO基因在健康乌鳢的头肾、肾、鳃、心、脾、肝、肌肉等七个组织中均有表达,在肠中不表达,其中,头肾表达量最高;感染维氏气单胞菌后,MPO在大多数组织中低水平表达;所有组织中一般在感染后的36h时,表达量有上升的趋势。
     本研究成功的构建了乌鳢头肾SSH cDNA文库,并获得了大量与乌鳢抗菌感染相关的基因片段,在此基础上,应用RACE技术获得三种免疫相关基因的全长,利用生物信息学对其进行了较为系统的分析,同时探讨了这三种基因的表达模式。研究成果为进一步了解并研究乌鳢抗菌感染的分子免疫机制奠定基础,同时为抗病品种的选育及病害防治提供了基础理论数据。
Channa argus, one of valuable fishes which is loved by the customers, is been food and medicine. In recent years, more kinds of diseases occur with the incremental farming area and the intensive aquaculture, especially the bacterial disease. This has become a significant barrier to the aquaculture development of Channa argus. Currently, to feed antibiotics is the general method to cure the bacterial disease. However, the drug residue and resistance is increasing. To develop the new no-toxic drug and disease resistance breeding is the tendency of the sustainable development of Channa argus aquaculture. Hence, it requires further study to antibacterial immunity-related genes and the immunologic mechanism of Channa argus.
     In this research, the head-kidney SSH cDNA library from Channa argus infected with Aeromonas veronii was constructed using Suppression Subtractive Hybridization. And by screening and BLASTn,202expressed sequence tags(ESTs) were acquired.73ESTs were unknown sequence, and the other129ESTs were grouped under6clusters based on their function. The immunity-related genes consist of25ESTs and represented13%of the whole ESTs.
     From the head-kidney SSH library, the gene segment of Cu/Zn-SOD, Rac2, and MPO were picked, and the full length were acquired with RACE. By the bioinformatics, the chemicophysical properties, protein structure and amino acid homology were analyzed. The expression and distribution of the three genes in health Channa argus and the expression change after challenge with Aeromonas veronii were detected by real-time quantitative PCR (RT-PCR).
     These results showed that the full length of Cu/Zn-SOD gene contained810bases, whose ORF contained465bases and encoded154amino acids. The multiple sequence alignment showed the amino acid sequence of Cu/Zn-SOD shared95%homologies with Tilapia Mossambica. The RT-PCR results showed that the SOD was expressed in head-kidney, kidney, gill, heart, spleen, liver, muscle, and intestines, and the relative expression quality of liver was the highest. After challenge with Aeromonas veronii, the average trend of expression quality was after rising to decline and maintained for a period of time, and then rose.
     The full length of Rac2gene contained1179bases, whose ORF contained579bases and encoded192amino acids. The amino acid sequence showed that the Rac2from most species all shared high homologies. The RT-PCR results showed that the Rac2was expressed in head-kidney, kidney, gill, heart, spleen, liver, and muscle, but not in intestines, and the relative expression quality of head-kidney was the highest. After challenge with Aeromonas veronii, the expression quality changed with time and all of them rose at36hour post-infection and exceeded it at0hr P.I.
     The full length of MPO gene contained3181bases, whose ORF contained2301bases and encoded766amino acids. The amino acid sequence showed that the MPO from most species was different from one another. The RT-PCR results showed that the Rac2was expressed in head-kidney, kidney, gill, heart, spleen, liver, and muscle, but not in intestines, and the relative expression quality of head-kidney was the highest. After challenge with Aeromonas veronii, the expression quality was low in most tissue and all rose at36hr P.I..
     In this work, we successfully constructed the head-kidney SSH cDNA library from Channa argus, and a number of ESTs related to antibacterial immunity was acquired. The full length of three genes was amplified and systematic analyzed, and then their patterns of expression were explored. These results can lay the foundation for further study about the molecular mechanism of immunity and the basic theoretical data for resistance breeding and disease control.
引文
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