CN111560339A - 桔小实蝇dsRNA细菌表达菌液的制备及其使用方法 - Google Patents
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Abstract
本发明属于农业生物技术领域,具体涉及一种桔小实蝇dsRNA细菌表达菌液的制备及其使用方法,选取桔小实蝇Flightin基因的部分序列SEQ ID NO.1,通过引物设计、flightin基因及对照egfp基因片段的克隆、构建桔小实蝇RNAi干扰表达载体、重组质粒转化大肠杆菌HT115以及dsRNA在大肠杆菌HT115中的表达,获得桔小实蝇dsRNA细菌表达菌液。本发明采用重组质粒可以在大肠杆菌HT115中表达大量所需的外源目的dsRNA的方法,降低了实验成本,持续饲喂菌液后对桔小实蝇的飞行能力有抑制作用,具有广阔的应用前景。
Description
技术领域
本发明属于农业生物技术领域,具体涉及一种桔小实蝇dsRNA细菌表达菌液的制备及其使用方法。
背景技术
桔小实蝇是全球具危害性的检疫性果蔬害虫,目前对该害虫的防治手段主要有人工防治、化学防治、性诱剂引诱、生物防治等,这些手段具有一定的防治效果,但总体存在效率低、成本高、对生态环境不友好等问题。
桔小实蝇具有极强的飞行能力,是造成其分布和发生区不断扩张,以及根除后又再次发生的重要原因,超强的飞行能力使得对桔小实蝇的防治变得困难。桔小实蝇具有的飞行蛋白flightin基因是一种大小在20kDa的多磷酸化肌原纤维蛋白,Flightin基因对昆虫肌肉伸展活化具有重要作用,在间接飞行肌的粗肌丝上与肌球蛋白高度融合,调控和指导粗肌丝的准确组装和收缩等。选择飞行蛋白flightin基因作为RNA 干扰靶标,破坏昆虫飞行肌表达通路,阻止昆虫肌肉伸展活化及肌丝的组装和收缩等生理过程,可达到害虫防治的目的。目前,并未有文献记载关于桔小实蝇flightin基因的干扰相关研究。
发明内容
针对目前未见利用RNA干扰技术抑制桔小实蝇飞行行为的研究,本发明提出一种桔小实蝇dsRNA细菌表达菌液的制备及其使用方法。
本发明的桔小实蝇flightin基因的dsRNA细菌表达菌液,其特征在于通过以下步骤获得:
1)引物设计
选取桔小实蝇Flightin基因的部分序列SEQ ID NO.1,结合含有T7聚合酶的L4440干扰载体的多克隆位点以及桔小实蝇flightin基因序列和egfp序列的限制性内切酶位点设计上游和下游引物。上、下游引物的5’端分别加入SacI和XhoI酶切位点,具体为:
flightin-F:5’-CGAGCTCACTCGTATAATGGCTGATG-3’;其中:下划线为SacI酶切位点;
flightin-R:5’-CCTCGAGATAGCGACAAGCTCCCAC-3’;其中:下划线为XhoI酶切位点;
egfp-F:5’-CGAGCTCACGTAAACGGCCACAAGTTC-3’;其中:下划线为SacI酶切位点;
egfp-R:5’-CCTCGAGAAGTCGTGCTGCTTCATGTG-3’;其中:下划线为XhoI酶切位点;
2)flightin基因及对照egfp基因片段的克隆
以桔小实蝇cDNA和含egfp基因的质粒为模板,通过PCR扩增,PCR扩增体系为TSINGKEMaster Mix DNA Polymerase 12.5μl,上下游引物和模板各1μl,加灭菌ddH2O至总体积25μl,扩增条件为95℃预变性3min,95℃ 30s,60℃ 30s,72℃ 1min,35个循环;最后72℃延伸10min,产物回收,得到含SacI和XhoI酶切位点的桔小实蝇Flightin和egfp基因片段;
3)构建桔小实蝇dsRNA细菌表达载体
将含SacI和XhoI酶切位点的桔小实蝇Flightin和egfp基因片段和L4440载体经SacI和XhoI双酶切后进行酶切产物回收,用 T4 连接酶将回收的L4440载体分别与flightin、egfp基因片段以1:3比例室温连接10 min,连接产物命名为L4440-flightin、L4440-egfp,分别转化大肠杆菌DH5α感受态细胞;将转化的感受态细胞涂布在含Amp、IPTG、Xgal的固体LB平板培养基上,37℃过夜培养,挑取白色单菌落于含Amp的LB液体培养基中培养,获得重组质粒L4440-flightin和L4440-egfp作为桔小实蝇RNAi的dsRNA细菌表达载体;
4)重组质粒转化大肠杆菌HT115
用热激法将L4440-flightin和L4440-egfp表达载体转入CaCl2法制备的 HT115 感受态细胞中,涂布于含50μg/ml Amp 和12.5 μg/ml Tet的LB固体培养基上,过夜培养后挑取单菌落接种到Amp和Tet抗性的LB液体培养基中,37℃振荡培养过夜,获得菌液;
5)dsRNA在大肠杆菌HT115中的表达
1:25比例将菌液转入新的 LB 培养基中,37℃,200 rpm培养至菌液 OD600 =0.4左右,加入IPTG终浓度至1.0 mmol/L进行诱导表达,诱导培养 4 h 后收集菌液,采用 TRIzol 法提取细菌总RNA,DNase I和RNase A溶液消化纯化总RNA,获得表达flightin-dsRNA和egfp-dsRNA的细菌菌液。
桔小实蝇dsRNA细菌表达菌液的使用方法,其特征在于采用饲喂法,从桔小实蝇羽化开始将桔小实蝇dsRNA细菌表达浓缩菌液拌进饲料连续饲喂。
为实现沉默靶标基因的目标,需控制最佳菌液浓缩程度及最佳饲喂时间,所述菌液最佳浓缩程度为20-50倍,最佳饲喂时间为桔小实蝇在1日龄时饲喂,最低连续饲喂25天。若菌液浓缩程度不够或错过最佳干扰时间,则上述菌液对桔小实蝇飞行能力削弱影响不显著。
RNAi是近年来新发现的一种通过 dsRNA 介导的特异性高效抑制基因表达的途径,其在基因功能研究及农业病虫害防治等领域中具有广阔应用前景。L4440质粒具有氨苄抗性,含有两个反向对应的T7强启动子,本发明采用重组质粒可以在大肠杆菌HT115中表达大量所需的外源目的dsRNA的方法,与现有技术采用的试剂盒体外转录和化学合成方法相比,能够大大降低实验成本。持续饲喂IPTG诱导表达靶标dsRNA的大肠杆菌HT115菌液后,对桔小实蝇的飞行能力有抑制作用,具有广阔的应用前景。
附图说明
图1为flightin和egfp基因干扰片段的克隆及干扰载体的构建示意图。
具体实施方式
实施例1:本研究所用的虫源均为云南省林业和草原科学院森保所室内饲养的桔小实蝇种群。饲养条件为:温度25℃~30℃,湿度为60%~70%,光周期为L16:D8。
引物设计:根据桔小实蝇flightin基因转录组序列(GeenBank登录号:XM_011210668),用siDirect (http://design.RNAi.jp/) 在线预测了可能存在的 siRNA 位点,选择其中 678 bp 序列作为 RNA 干扰片段,即SEQ ID NO.1;用Primer5.0和Oligo6,结合含有T7聚合酶的L4440干扰载体的多克隆位点以及桔小实蝇flightin基因序列和egfp序列的限制性内切酶位点设计上游和下游引物。上、下游引物的5’端分别加入SacI和XhoI酶切位点。
flightin-F:5’-CGAGCTCACTCGTATAATGGCTGATG-3’(下划线为SacI酶切位点);
flightin-R:5’-CCTCGAGATAGCGACAAGCTCCCAC-3’(下划线为XhoI酶切位点);
egfp-F:5’-CGAGCTCACGTAAACGGCCACAAGTTC-3’(下划线为SacI酶切位点);
egfp-R:5’-CCTCGAGAAGTCGTGCTGCTTCATGTG-3’(下划线为XhoI酶切位点)。
桔小实蝇flightin基因及对照egfp基因片段的克隆:分别以桔小实蝇cDNA和含egfp基因的质粒为模板,按照TSINGKE Master Mix DNA Polymerase说明书进行PCR扩增,克隆桔小实蝇flightin及egfp基因干扰片段。PCR扩增体系:TSINGKE Master Mix DNAPolymerase 12.5μl,上下游引物和模板各1μl,加灭菌ddH2O至总体积25μl;扩增条件:95℃预变性3min,95℃ 30s,60℃ 30s,72℃ 1min,35个循环;最后72℃延伸10min;反应结束后,l%琼脂糖凝胶电泳检测并用DNA回收试剂盒纯化回收目的片段送测序。
桔小实蝇flightin及egfp基因的RNA干扰表达载体构建:将L4440质粒与胶回收的桔小实蝇flightin和egfp基因片段分别同时用SacI和XhoI进行双酶切,37℃,1 h,分别回收酶切产物;用 T4 连接酶将回收的L4440载体分别与flightin、egfp基因片段以1:3比例室温连接10 min;连接产物命名为L4440-flightin、L4440-egfp,分别转化大肠杆菌DH5α感受态细胞;将转化的感受态细胞涂布在含Amp、IPTG、Xgal的固体LB平板培养基上,37℃过夜培养,挑取白色单菌落于含Amp的LB液体培养基中培养,菌液PCR检测阳性后,提取重组质粒L4440-flightin和L4440-egfp,用SacI和XhoI双酶切鉴定,筛选阳性克隆,取阳性克隆菌液送测序。
重组质粒转化大肠杆菌HT115:用热激法将L4440-flightin和L4440-egfp表达载体转入CaCl2法制备的 HT115 感受态细胞中,涂布于含50μg/ml Amp 和12.5 μg/ml Tet的LB固体培养基上,过夜培养后挑取单菌落接种到Amp和Tet抗性的LB液体培养基中,提取质粒并通过 PCR 及双酶切鉴定阳性克隆,重组质粒进一步通过测序进行验证。
dsRNA在大肠杆菌HT115中的表达:将带有L4440-flightin和L4440-egfp的HT115菌液接种于 Amp和Tet抗性LB液体培养基中,37℃振荡培养过夜,1:25比例将菌液转入新的LB 培养基中,37℃,200 rpm培养至菌液 OD600 =0.4左右,加入IPTG终浓度至1.0 mmol/L进行诱导表达,诱导培养 4 h 后收集菌液。采用TRIzol法提取细菌总RNA,DNaseI和RNase A溶液消化纯化总RNA,获得flightin-dsRNA和egfp-dsRNA。
饲喂细菌表达dsRNA的菌液:采用饲喂法,从桔小实蝇羽化开始将表达桔小实蝇dsRNA的50倍浓缩菌液拌进饲料连续饲喂,桔小实蝇在1日龄时饲喂,最低连续饲喂25天
作为验证,本发明提供flightin和egfp基因干扰片段的克隆及干扰载体的构建的电泳检测结果。
桔小实蝇flightin及对照egfp基因干扰片段的克隆:PCR扩增得到含SacI和XhoI酶切位点的桔小实蝇flightin和egfp基因片段,结果为,桔小实蝇flightin基因片段介于500-750bp之间,对照egfp基因片段介于100-250bp之间分别与预期添加了酶切位点和保护碱基后的大小692bp和201bp相符(图1 A 3、4泳道)。测序结果与Genebank中报道的序列进行比对,无碱基差异,同源性达100%,桔小实蝇flightin基因及egfp基因干扰片段克隆成功;把载体质粒L4440和胶回收得到的目的片段分别经限制性内切酶SacI和XhoI双酶切后,2790 bp的L4440质粒线性化单一条带约为2755 bp,桔小实蝇flightin及对照egfp基因大小正确(图1 A 2、5、6泳道)。
dsRNA表达载体的构建:HT115 菌株中提取的重组质粒L4440-flightin和L4440-egfp(图1 B)经SacI和XhoI双酶切后,1%琼脂糖凝胶电泳20 min检测均分别得到两条带,2755bp的线性化L4440质粒载体,及678 bp和187 bp左右的flightin和egfp目的片段(图1C),表明桔小实蝇flightin基因和对照egfp基因片段成功转入 L4440 质粒中,与预期设计一致。双向测序结果与目的基因序列完全一致,阅读框正确,说明已经成功构建了L4440-flightin和L4440-egfp干扰表达载体。
<110> 云南省林业和草原科学院
<120> 桔小实蝇dsRNA细菌表达菌液的制备及其使用方法
<160> 1
<170> SIPOSequenceListing 1.0
<210> 2
<211> 678
<212> DNA
<213> 桔小实蝇(Bactrocera dorsalis flightin)
<400> 2
actcgtataa tggctgatga ggaggatcca tggggtttcg atgagggtga tagtgagcca 60
gccgctgccc ctgctcctgc cgctgccgct gccgcagatg caggtgctgc ccctgccgcg 120
ggtggtggtg agagcgcccc aacaggaggc gaaactgaag cagctgccgc cgaagaagaa 180
tcggcaccac caccaccgcc gccagaagac gatgggtacc gaaagcccgt gcaactatat 240
cgtcactggg tgagaccaca attcttgcag tataaataca tgtacaacta cagaacaaac 300
tactatgatg acgtaattga ttacttggat aagaagcaag ttggcgtttc aagggaaata 360
ccgcgcgcac aaacttgggc tgaacgcgtg ctcagaacaa gcaacgccag tggacgtgac 420
cttgactcat acacatgttc aagcaaaagg gataagcatc ttgttcaaac tctggctgcc 480
tcgattcgta ctcataatta tcacaccaaa gcttatatta accaaaaata tgcaaatgtt 540
ctataaataa atacaaaacc tatctataaa tatgaatacc aactaaaaag ttagttaaaa 600
ttgtagtaca atttaattat aaggagatga ttacctaatt acgttctaat aaacaataaa 660
gtgggagctt gtcgctat 678
Claims (3)
1.桔小实蝇flightin基因的dsRNA细菌表达菌液,其特征在于通过以下步骤获得:
1)引物设计:
选取桔小实蝇Flightin基因的部分序列SEQ ID NO.1,结合含有T7聚合酶的L4440干扰载体的多克隆位点以及桔小实蝇flightin基因序列和egfp序列的限制性内切酶位点设计上游和下游引物;
上、下游引物的5’端分别加入SacI和XhoI酶切位点,具体为:
2)flightin基因及对照egfp基因片段的克隆:
以桔小实蝇cDNA和含egfp基因的质粒为模板,通过PCR扩增,PCR扩增体系为TSINGKEMaster Mix DNA Polymerase 12.5μl,上下游引物和模板各1μl,加灭菌ddH2O至总体积25μl,扩增条件为95℃预变性3min,95℃ 30s,60℃ 30s,72℃ 1min,35个循环;最后72℃延伸10min,产物回收,得到含Sac和Xho酶切位点的桔小实蝇Flightin和egfp基因片段;
3)构建桔小实蝇RNAi干扰表达载体:
将含Sac和Xho酶切位点的桔小实蝇Flightin和egfp基因片段和L4440载体经Sac和Xho双酶切后进行酶切产物回收,用 T4 连接酶将回收的L4440载体分别与flightin、egfp基因片段以1:3比例室温连接10 min,连接产物命名为L4440-flightin、L4440-egfp,分别转化大肠杆菌DH5α感受态细胞;将转化的感受态细胞涂布在含Amp、IPTG、Xgal的固体LB平板培养基上,37℃过夜培养,挑取白色单菌落于含Amp的LB液体培养基中培养,获得重组质粒L4440-flightin和L4440-egfp作为桔小实蝇dsRNA细菌表达载体;
4)重组质粒转化大肠杆菌HT115:
用热激法将L4440-flightin和L4440-egfp表达载体转入CaCl2法制备的 HT115 感受态细胞中,涂布于含50μg/ml Amp 和12.5 μg/ml Tet的LB固体培养基上,过夜培养后挑取单菌落接种到Amp和Tet抗性的LB液体培养基中,37℃振荡培养过夜,获得菌液;
5)dsRNA在大肠杆菌HT115中的表达:
1:25比例将菌液转入新的 LB 培养基中,37℃,200 rpm培养至菌液 OD600 =0.4左右,加入IPTG终浓度至1.0 mmol/L进行诱导表达,诱导培养 4 h 后收集菌液,采用 TRIzol 法提取细菌总RNA,DNase I和RNase A溶液消化纯化总RNA,获得表达flightin-dsRNA和egfp-dsRNA的细菌菌液。
2.桔小实蝇dsRNA细菌表达菌液的使用方法,其特征在于采用饲喂法,从桔小实蝇羽化开始将桔小实蝇dsRNA细菌表达浓缩菌液拌进饲料连续饲喂。
3.如权利要求2所述的2.桔小实蝇dsRNA细菌表达菌液的使用方法,其特征在于菌液最佳浓缩程度为20-50倍,最佳饲喂时间为桔小实蝇在1日龄时饲喂,最低连续饲喂25天。
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