CN113528407A - 一株变形假单胞菌tonB基因沉默菌株及其应用 - Google Patents
一株变形假单胞菌tonB基因沉默菌株及其应用 Download PDFInfo
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Abstract
本发明提供了一株变形假单胞菌tonB基因沉默菌株及其应用。所述菌株为Pseudomonas plecoglossicidatonB‑RNAi,已于2020年12月18日于中国典型培养物保藏中心保藏,保藏号为CCTCC NO:M 2020919。本发明的变形假单胞菌tonB基因沉默菌株与野生菌株相比,对斜带石斑鱼的致病力极显著下降,而且能够引起斜带石斑鱼脾脏转录组发生显著变化,因此该菌株能用于研究变形假单胞菌的致病机理,特别是从感染斜带石斑鱼以及物质运输角度研究变形假单胞菌的致病机理有着独特的优势。
Description
技术领域
本发明属于微生物技术领域,更具体涉及一株变形假单胞菌tonB基因沉默菌株及其应用。
背景技术
变形假单胞菌(Pseudomonas plecoglossicida)是大黄鱼、斜带石斑鱼等海水养殖鱼类“内脏白点病”的病原菌,每年造成的直接经济损失超亿元。
tonB基因编码TonB系统(TonB-ExbB -ExbD)中的TonB蛋白。早期研究表明,tonB基因在革兰氏阴性菌中广泛存在。TonB系统由固定在细胞膜上的ExbB-ExbD和周质蛋白TonB组成,它为依赖 TonB的外膜受体 (TBDTs)提供能量,并支持重要营养物质的积极运输,包括铁、血红蛋白、维生素B12和碳水化合物。铁在细菌致病性和宿主防御机制中发挥着重要作用,但这一作用往往被低估。在细菌-宿主相互作用中,对铁的争夺对感染结果至关重要。已有相关报道证实了TonB系统与菌株的毒力相关,但关于tonB基因的报道较少。因此, 探明变形假单胞菌tonB基因在感染斜带石斑鱼中的功能能够揭示其对变形假单胞菌致病性的意义。
本发明通过基因沉默技术构建了一株变形假单胞菌tonB基因稳定沉默菌株,然后通过人工感染实验确定tonB基因稳定沉默菌株对斜带石斑鱼的致病性,并利用RNA-seq技术对野生毒株和tonB基因稳定沉默菌株感染后的斜带石斑鱼脾脏的转录进行分析,从转录组层面探讨tonB基因在变形假单胞菌感染斜带石斑鱼过程中的功能,进而揭示了tonB基因对变形假单胞菌毒力的影响,尤其是从物质运输角度对变形假单胞菌毒力的影响。本发明所构建的变形假单胞菌tonB基因稳定沉默菌株对斜带石斑鱼的致病力极显著下降,而且能够引起斜带石斑鱼脾脏转录组发生显著变化,因此该菌株可用于研究变形假单胞菌的致病机理,特别是从感染斜带石斑鱼以及物质运输角度研究变形假单胞菌的致病机理有着独特的优势。
发明内容
本发明的主要目的是提供一株变形假单胞菌tonB基因稳定沉默菌株,揭示tonB基因在转录组层面对变形假单胞菌毒力的影响,明确了该菌株的应用范围。
为实现上述目的,本发明采用如下技术方案:
一株变形假单胞菌tonB基因稳定沉默菌株,所述菌株为Pseudomonas plecoglossicidatonB-RNAi,已于2020年 12月18日于中国典型培养物保藏中心保藏,保藏号为CCTCC NO: M 2020919,地址为中国.武汉.武汉大学。
一株变形假单胞菌tonB基因沉默菌株的构建技术路线,包括以下步骤:
步骤一:通过比较转录组学分析发现,tonB基因在变形假单胞菌感染的斜带石斑鱼脾脏内高表达;所述 tonB基因序列如SEQ ID NO.1所示;
步骤二:合成shRNA,退火后连入pCM130/tac构建重组载体,通过电转技术将重组载体导入变形假单胞菌感受态细胞,构建变形假单胞菌tonB基因沉默菌株;利用qRT-PCR技术验证菌株的沉默效果。
用5104 cfu/尾剂量的变形假单胞菌野生株和tonB基因沉默株和PBS(NaCl
0.8g、KCl 0.02g、Na2HPO4 0.36g、 KH2PO4 0.024g、H2O 1L,pH 7.0)分别感染斜带石斑鱼,明
确tonB基因对变形假单胞菌毒力的影响。
利用dual RNA-seq技术对tonB基因沉默株和变形假单胞菌野生株感染后的斜带石斑鱼的脾脏进行转录组测序,比较分析tonB基因的沉默对变形假单胞菌和斜带石斑鱼基因表达的影响。
通过基因测序和比对,本发明提供的菌株为一株变形假单胞菌tonB基因沉默菌株,揭示了tonB基因对变形假单胞菌毒力的影响及在感染斜带石斑鱼中的功能。
上述一株变形假单胞菌tonB基因沉默菌株在制备预防和治疗鱼类内脏白点病制剂中的应用。
上述一株变形假单胞菌 tonB基因沉默菌株在变形假单胞菌致病机理研究中的应用。
本发明的优点在于:
变形假单胞菌tonB基因稳定沉默菌株感染的斜带石斑鱼的死亡率为80%,而变形假单胞菌野生株感染后斜带石斑鱼的死亡率为100%,说明tonB基因是变形假单胞菌重要的毒力基因。
RNA-seq分析结果表明,tonB基因的稳定沉默能够显著影响斜带石斑鱼的转录组表达,这说明变形假单胞菌tonB基因稳定沉默菌株能用于斜带石斑鱼感染以及从物质运输角度研究变形假单胞菌的致病机理。
附图说明:
图1:tonB-RNAi沉默株mRNA水平与生长曲线。 (A):4株tonB-RNAi沉默株的tonBmRNA水平。(B)野生型菌株和tonB-RNAi菌株的生长曲线。
图2:野生型菌株和tonB-RNAi菌株的毒力研究。 (A):不同感染组在10dpi时的斜带石斑鱼存活率;(B):变形假单胞菌感染斜带石斑鱼脾脏的症状;(C):与野生型变形假单胞菌感染组相比,tonB-RNAi菌株感染组的脾脏菌株丰度;(D)tonB基因mRNA在斜带石斑鱼脾脏中的表达水平。
图3:感染第3天脾脏中斜带石斑鱼基于DESeq2分析tonB基因稳定高效沉默菌株和野生型菌株感染斜带石斑鱼的脾RNA池的火山图。
图4:感染第3天脾脏中斜带石斑鱼 DEMs的KEGG通路富集分析。
图5: 感染第5天脾脏中斜带石斑鱼基于DESeq2分析tonB基因稳定高效沉默菌株和野生型菌株感染斜带石斑鱼脾RNA池的火山图。
图6感染第5天脾脏中斜带石斑鱼DEMs的GO富集分析。
图7 感染第5天脾脏中斜带石斑鱼DEMs的KEGG通路富集分析。
图8:感染第3天KEGG富集通路分析。(A) 抗原呈递与加工通路分析(3d);(B)部分补体与凝血级联通路分析(5d);红色代表上调,蓝色代表下调,紫色代表无显著变化。
具体实施方式
为了使本发明所述的内容更加便于理解,下面结合具体实施方式对本发明所述的技术方案做进一步的说明,但是本发明不仅限于此。
实施例1
一株变形假单胞菌tonB基因稳定沉默菌株的构建方法,包括以下步骤:
步骤一:用比较转录组学技术分析变形假单胞菌在斜带石斑鱼脾脏内的基因表达情况,发现tonB基因特异性高表达,就将目标锁定tonB基因;tonB基因序列如SEQ ID NO.1所示;
步骤二:针对tonB基因序列利用Thermo-fisher Scientific 公司在线shRNA设计
工具,
利用在线shRNA设计工具设计并合成了4对shRNA引物,分别连入pCM130/tac构建重组载体,
然后将各重组载体分别电转导入变形假单胞菌感受态细胞,成功构建变形假单胞菌tonB基
因稳定沉默菌株;利用qRT-PCR技术,引物为(F: 5'-GTGGACACGCCGCCAAGCAA-3';R: 5'-
GCCAGGTGACGCAGCAAATCG-3')对沉默效果进行检验。图1A显示了4株tonB -RNAi菌株的沉默
效果。其中,tonB-RNAi-663的沉默效果最好,达到94.0%,即为变形假单胞菌tonB基因稳定
高效沉默株。
4对shRNA引物序列如下:
引物1:
F:5'-TGCATCGCTTCGAACAGCAAAGTTCAAGAGACTTTGCTGTTCGAAGCGATGCTTTTTTT-3';
R:5'-GTACAAAAAAAGCATCGCTTCGAACAGCAAAGTCTCTTGAACTTTGCTGTTCGAAGCGATGCATGCA-3';
引物2:
F:5'-TGCTTCGAACAGCAAAGCCTTGTTCAAGAGACAAGGCTTTGCTGTTCGAAGCTTTTTTT-3';
R:5'-GTACAAAAAAAGCTTCGAACAGCAAAGCCTTGTCTCTTGAACAAGGCTTTGCTGTTCGAAGCATGCA-3';
引物3:
F:5’-TGCCACCTGAGTTGCTGAACAATTCAAGAGATTGTTCAGCAACTCAGGTGGCTTTTTTT-3’;
R:5’-GTACAAAAAAAGCCACCTGAGTTGCTGAACAATCTCTTGAATTGTTCAGCAACTCAGGTGGCATGCA-3';
引物4:
F:5’-TGCTGAACAATGGCACGATCGATTCAAGAGATCGATCGTGCCATTGTTCAGCTTTTTTT-3’;
R:5’-GTACAAAAAAAGCTGAACAATGGCACGATCGATCTCTTGAATCGATCGTGCCATTGTTCAGCATGCA-3’。
所述变形假单胞菌菌株为Pseudomonas plecoglossicidatonB-RNAi,已于2020年12月18日于中国典型培养物保藏中心保藏,保藏号为CCTCC NO:M 2020919,地址为中国.武汉.武汉大学。
实施例2
利用人工感染实验,对变形假单胞菌野生株和tonB基因稳定高效沉默株的毒力进行对比。
tonB基因稳定高效沉默株、变形假单胞菌野生株来源于本课题组,由胡娇等于
2014年分离鉴定,并保存于实验室-80℃超低温冰箱中(胡娇, 张飞, 徐晓津, 等. 大黄鱼
(Pseudosciaena crocea)内脏白点病病原分离鉴定及致病性研究[J]. 海洋与湖沼,
2014, 45(02): 409-417.)和PBS(NaCl 0.8g、KCl 0.02g、Na2HPO4 0.36g、 KH2PO4 0.024g、
H2O 1L,PH 7.0)分别对三组斜带石斑鱼进行胸腔注射感染,菌株感染浓度为5104 cfu/尾,
每条鱼注射0.2 mL,每组20尾鱼,然后继续正常暂养(在无致病性的实验室条件下,水温18
±2℃),并记录每天各组鱼的存活状况。
在注射后10 d,分别对野生型菌株组、tonB基因稳定高效沉默株组和PBS组的生存率进行评估。注射野生型菌株后3dpi时鱼的存活率为70%,7.5dpi时存活率为0%。PBS组斜带石斑鱼在整个实验期间均存活。变形假单胞菌野生菌株的生长速率和菌浓度在培养的48小时(LB培养基,温度18℃)略高于tonB基因稳定高效沉默株(图1B)。与野生型菌株相比,用tonB基因沉默株注射的斜带石斑鱼在死亡时间上表现出明显的延迟和明显的减少(图2A)。注射野生型菌株的斜带石斑鱼的脾脏表现出典型的症状(脾脏表面有许多白点覆盖),但注射tonB基因沉默株的脾脏表面有轻微的白点(图2B)。野生型毒株与tonB-RNAi毒株感染斜带石斑鱼脾脏内的菌株丰度随时间变化差异较大。总体上,6个时间点细菌丰度比值均小于100%,其中4dpi上两组菌株丰度最接近(图2C),同时,tonB 基因在tonB-RNAi毒株感染斜带石斑鱼脾脏内的表达量始终低于野生型菌株(图 2D)。
实施例3
利用RNA-seq技术对tonB基因沉默株和野生株变形假单胞菌感染后的斜带石斑鱼的脾脏进行转录组测序,比较分析tonB基因的沉默对变形假单胞菌和斜带石斑鱼基因表达的影响。
RNA-seq分析结果显示,在mRNA水平上,根据统计标准 (|log2 fold change| ≥1, padj ≤0.05),在感染第3天,斜带石斑鱼共鉴定出375个差异表达基因。在这些差异表达基因,与感染野生型菌株相比,感染tonB-RNAi菌株组的有84个显著下调,291个显著上调(图3)。GO分类和KEGG通路分析确定宿主斜带石斑鱼差异表达基因的生物学功能。KEGG富集分析结果也显示DEMs(Differential Expression mRNAs)在感染过程中与免疫高度相关,包括抗原呈递与加工,B细胞受体信号通路、Toll-Imd 信号通路等(图4)。其中,在抗原呈递与加工信号通路富集到的的基因数最多。
在感染第5天,斜带石斑鱼共鉴定出218个差异表达基因。在这些差异表达基因,与感染野生型菌株相比,感染tonB-RNAi菌株组的有175个显著下调,43个显著上调(图5)。图6显示了GO显著富集的29个结果,其中在BP中富集到1/2与免疫相关通路(图6)。KEGG富集分析结果(图7)也显示DEMs在感染过程中与免疫高度相关,包括T细胞受体信号通路、趋化因子信号通路,补体与凝血级联等。其中,在补体与凝血级联通路富集的基因数最多。
利用比较转录组的结果进行GO和KEGG富集分析,确定DEMs的生物学功能,分析病原菌在感染过程中转录组的变化。图8A为显著富集的在感染第3天显著富集的KEGG通路(抗原呈递与加工),该通路中由17个DEMs,其中MHCI、HSP70、TAPBP、TCR、CTSS/L/B、AEP显著上调,MHCII、TAP1/2显著下调(图8A)。图8B为显著富集的在感染第5天显著富集的KEGG通路(补体与凝血级联),该通路中由21个DEMs,其中F1、C3、C5、C6、C7、C8、C9显著下调(图8B)。
以上所述仅为本发明的较佳实施例,凡依本发明申请专利范围所做的均等变化与修饰,皆应属本发明的涵盖范围。
SEQUENCE LISTING
<110> 集美大学
<120> 一株变形假单胞菌tonB基因沉默菌株及其应用
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Claims (4)
1.一株变形假单胞菌tonB 基因沉默菌株,其特征在于:所述菌株为Pseudomonas plecoglossicida tonB-RNAi,已于2020年 12月18日于中国典型培养物保藏中心保藏,保藏号为CCTCC NO:M 2020919。
2.如权利要求1所述一株变形假单胞菌tonB基因沉默菌株的构建方法,其特征在于:包括以下步骤:
步骤一:通过比较转录组学分析发现,tonB基因在变形假单胞菌感染的斜带石斑鱼脾脏内高表达;
步骤二:合成shRNA,退火后连入pCM130/tac构建重组载体,通过电转技术将重组载体导入变形假单胞菌感受态细胞,构建变形假单胞菌tonB基因沉默菌株;利用qRT-PCR技术验证菌株的沉默效果。
3.根据权利要求2所述的一株变形假单胞菌tonB基因沉默菌株的构建方法,其特征在于:所述 tonB基因序列如SEQ ID NO.1所示。
4.如权利要求1所述的一株变形假单胞菌 tonB基因沉默菌株在研究变形假单胞菌致病机制中的应用。
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