摘要
目的
探讨利用转基因微藻防控传播登革热等疾病的伊蚊的技术可行性。
方法
以伊蚊神经递质转运体γ-氨基丁酸受体基因(gamma-aminobutyric acid receptor gene, gat)为靶点,构建shRNA微藻(Microalgae)表达载体,通过电击法将其转入莱茵衣藻(Chlamydomonas reinhardtii) CC124和小球藻(Chlorella vulgaris) HOC5中,获得重组微藻,并用其饲喂伊蚊幼虫和成蚊。
结果
gat-shRNA转基因藻株可显著延缓伊蚊幼虫的发育、对伊蚊幼虫和成蚊表现出明显的致死效果,致死率分别为75.56%和58.67%。伊蚊幼虫体内目标基因gat的表达量显著降低。
结论
在封闭水域中投放gat-shRNA转基因微藻以抑制水域附近的蚊子种群是可行的。该策略为使用生物方法控制伊蚊,以及阻断登革热、寨卡病毒病等严重传染病的传播提供了一种新的思路。
登革热(dengue fever, DF)是一种由蚊子传播的疾病,已经成为全球范围内一个非常紧急和重要的公共卫生问题。根据世界卫生组织(World Health Organization, WHO)的统计数据(https://www.who.int/zh/emergencies/disease-outbreak-news/item/2023-DON498),从2000年到2019年,全球报告的登革热病例数量从50万增加到了520万,这些病例分布在129个国家。2024年全球登革热疫情高发,多国出现病例数上升。据WHO通报(https://new.qq.com/rain/a/20240520A08ITS00),美洲地区2024年1-3月报告的登革热病例数超过300万,是2023年的3倍;巴西发现的登革热疑似及确诊病例累计已超过427万例,死亡病例达到2 197例;阿根廷登革热确诊病例为37.9万余例。1978年,我国首次在广东省佛山市发现了登革热病例。至今,我国在广东、广西、海南、云南、浙江、福建、台湾、澳门和香港等地区报告了登革热的暴发或流行以及本地感染病
目前,登革热的预防主要集中在消灭媒介蚊子上,采用的方法包括物理方法和化学方法。化学方法涉及使用不同类型的杀虫剂,如菊酯类杀虫剂、有机磷类杀虫剂以及四氟苯菊酯定量气雾
γ-氨基丁酸(γ‑aminobutyric acid, GABA)是一种重要的抑制性神经递质,它可以通过转运蛋白(GABA transporter, GAT)进入神经元或神经胶质细胞中。GAT属于N
1 材料与方法
1.1 材料
白纹伊蚊捕捉于中国热带农业科学院院内,由本实验室继代保存。莱茵衣藻CC124购自中国科学院淡水藻种库(https://algae.ihb.ac.cn/);小球藻HOC5为海南本地物种,分离纯化后接于Tris-acetate-phosphate (TAP)固体培养基保存。柱式质粒DNA小量抽提试剂盒购自Omega公司;植物DNA提取试剂盒、RNA提取试剂盒均购自广州美基生物科技有限公司;潮霉素B购自北京索莱宝科技有限公司;反转录试剂盒购自北京康为世纪生物科技有限公司;Ace
1.2 白纹伊蚊gat基因shRNA靶位点选择与设计
根据NCBI上已公布的伊蚊gat基因的mRNA序列(GenBank登录号为XM_019696122),通过线上设计网站GPP (http://www.broadinstitute.org/rnai/public/seq/search)筛选出分数最高的几条shRNA靶序列,并进行BLAST比对,排除与其他非相关基因同源的序列后,选择合适的作为靶序列。shRNA模板中选用CTCGAG序列作为中间loop环结构。根据pCAMBIA1302载体的酶切位点要求,在正义链的5′端添加GATC,可与Bgl Ⅱ酶切pCAMBIA1302载体后的黏性末端互补;在反义链的5′端添加GTCACC,可与BstE Ⅱ酶切pCAMBIA1302载体后的黏性末端互补。设计好的shRNA序列包含酶切位点、正义链、loop环、反义链、终止信号和酶切位点,其序列见
Primers name | Primer sequences (5′→3′) | Initial position |
---|---|---|
Gat target sequence | CGTGTGCTTCATCAGTTATTT | 325 |
Gat-shRNA-F |
GATCCGTGTGCTTCATCAGTTATTTCTCGAGAAATAA CTGATGAAGCACACGTTTTTG | |
Gat-shRNA-R |
GTCACCAAAAACGTGTGCTTCATCAGTTATTTCTCG AGAAATAACTGATGAAGCACACG | |
Gat transcripts |
GATCCGTGTGCTTCATCAGTTATTTCTCGAGAAA TAACTGATGAAGCACACG | |
pCAMBIA1302-F | TTACCCAACTTAATCGCCTTGCAG | |
pCAMBIA1302-R | TATCGCAATGATGGCATTTGTAGG | |
Gat-F | TGCCTTGTTCCCGTACTTCC | |
Gat-R | GCGTTACGGCATCAATCCAC | |
PRS17-F | AAGAAGTGGCCATCATTCCA | |
PRS17-R | GGTCTCCGGGTCGACTTC |
1.3 shRNA RNAi表达载体构建及鉴定
1.3.1 目的单链片段退火成双链
将设计合成的正、反向寡核苷酸单链(100 μmol/L)各1 µL加入48 μL的10×H buffer (稀释10倍)反应体系中(引物终浓度 2 μmol/L),从95 ℃缓慢退火至室温,形成两端分别具有Bgl Ⅱ和BstE Ⅱ黏性末端的寡核苷酸双链。
1.3.2 pCMBIA1302载体的限制性酶切
先后使用Bgl Ⅱ和BstE II限制酶对pCAMBIA1302载体进行双酶切,通过1%琼脂糖凝胶电泳鉴定并用柱式DNA胶回收试剂盒回收。
1.3.3 连接与转化
将酶切后回收的载体与退火产物在16 ℃下连接过夜(T4 DNA连接酶)。连接产物转入TOP10感受态细菌中,并涂布于含有卡那霉素(100 μg/mL)的LB平板上,37 ℃恒温培养过夜(12-16 h)。第2天,挑取阳性单菌落于50 mL含有卡那霉素的LB液体培养基中,37 ℃、180 r/min培养10-12 h,提取质粒,并用Sph I酶切鉴定重组质粒。未连接干扰片段的空载体pCAMBIA1302质粒作为对照。将构建好的重组质粒命名为gat-p1302。
1.4 shRNA RNAi重组微藻的转化、筛选与鉴定
1.4.1 电击法转化莱茵衣藻、小球藻
采用Wang
1.4.2 筛选后阳性藻株的DNA提取及PCR鉴定
使用植物DNA提取试剂盒提取工程藻株的DNA,并进行PCR反应。引物序列见
1.4.3 伊蚊的饲养
蚊虫的孵育条件:温度27-29 ℃,强光照射,添加饲料,直至成蚊羽化。成蚊生长条件:温度27 ℃,相对湿度70%,使用10%蔗糖溶液饲喂成蚊,每48 h提供1次小白鼠供雌蚊吸血。
1.4.4 伊蚊幼虫的生物学检测
将阳性工程藻株用于饲喂伊蚊幼虫,每组30只幼虫,重复3次。阳性工程藻饲喂伊蚊幼虫4 d后,每组随机选取5只幼虫测量体长。
饲喂不同转基因藻株4 d后,使用RNA提取试剂盒提取伊蚊幼虫总RNA,使用反转录试剂盒进行反转录,得到cDNA后,以白纹伊蚊体内核糖体蛋白S17 (ribosomal protein S17,Gene ID:109416926)作为内参基因进行qPCR检测。引物序列见
1.4.5 糖毒诱饵试验
野生型CC124藻株与10%蔗糖溶液混合作为阴性对照;0.1 mg/L溴氰菊酯与10%蔗糖溶液混合作为阳性对照;重组藻株与10%蔗糖溶液混合作为实验组。上述溶液按1:1比例混合后用于饲喂伊蚊成蚊。每组50只成蚊,重复3次,实验为期7 d,每天统计蚊虫死亡情况。
2 结果与分析
2.1 shRNA RNAi表达载体的验证
使用限制性内切酶Sph I对构建好的p1302-gat重组质粒进行单酶切,以未连接干扰片段的空载pCAMBIA1302质粒作为对照。如

图1 琼脂糖凝胶电泳图。A:gat-shRNA二级结构预测图;B:gat-p1302鉴定结果图(Lane M:DL5000 DNA marker;Lanes 1-2:gat-p1302;Lane 3:pCAMBIA1302质粒);C:转基因藻鉴定结果图(Lane M:DL500 DNA marker;Lanes 1-5:gat-shRNA小球藻转化子1-5;Lanes 7-12:gat-shRNA莱茵衣藻转化子1-5;Lanes 14-15:转空载体pCAMBIA1302的莱茵衣藻转化子1-2;Lanes 16-18:转空载体pCAMBIA1302的小球藻转化子1-2;Lanes 6、13:p1302-gat质粒;Lane 19:CC124 DNA;Lane 20:pCAMBIA1302质粒)。
Figure 1 Agarose gel electrophoresis. A: gat-shRNA secondary structure prediction diagram; B: Identification result of gat-p1302 (Lane M: DL5000 DNA marker; Lanes 1-2: gat-p1302; Lane 3: pCAMBIA1302 plasmid); C: Transgenic algae identification result diagram (Lane M: DL500 DNA marker; Lanes 1-5: Transformants 1-5 of gat-shRNA Chlorella; Lanes 7-12: Transformants 1-5 of gat-shRNA C. reinhardtii; Lanes 14-15: Transformants 1-2 of C. reinhardtii with the empty vector pCAMBIA1302; Lanes 16-18: Transformants 1-2 of Chlorella with the empty vector pCAMBIA1302; Lanes 6 and 13: p1302-gat plasmid; Lane 19: CC124 DNA; Lane 20: pCAMBIA1302 plasmid).
2.2 阳性shRNA RNAi重组微藻的获得
将准备好的质粒与生长至对数期的CC124和HOC5分别进行电击转化。分别以ddH2O组转化CC124和HOC5作为阴性对照,以空载体pCAMBIA1302转化微藻作为阳性对照。电击转化后,将藻株涂布在含有25 μg/mL和150 μg/mL潮霉素B的TAP固体培养基上,筛选阳性工程藻株。将筛选后的单个藻株挑入50 mL TAP液体培养基中培养至对数期(OD值为0.3-0.5),提取微藻基因组DNA进行 PCR鉴定。2%琼脂糖凝胶电泳部分结果见
2.3 饲喂shRNA重组微藻对伊蚊幼虫进行RNA干扰
2.3.1 饲喂shRNA重组微藻对伊蚊幼虫的影响
为了探究gat基因沉默对伊蚊幼虫的致死效果,将成功转化的RNAi重组微藻用于饲喂伊蚊幼虫,设置2组实验。第1组:对照组(饲料组、CC124组、pCAMBIA1302组)和实验组(转莱茵衣藻gat 1-5号转化子);第2组:对照组(饲料组、HOC5组、pCAMBIA1302组)和实验组(转小球藻gat 1-5号转化子),每组重复3次。观察发现,饲喂重组莱茵衣藻和小球藻的伊蚊幼虫生长发育迟缓,身体出现轻微颤抖,对光照反应迟钝。幼虫死亡率见

图2 饲喂重组微藻的伊蚊幼虫死亡率。A:饲喂转莱茵衣藻gat-shRNA转化子1-5的幼虫死亡率(CC124:野生莱茵衣藻饲喂幼虫);B:饲喂转小球藻gat-shRNA转化子1-5的幼虫死亡率(HOC5:野生小球藻饲喂幼虫)。Fodder:用饲料饲喂幼虫;p1302:转空载体pCAMBIA1302的小球藻饲喂幼虫;gat-p1302-1-gat-p1302-5:转gat-shRNA小球藻饲喂幼虫。
Figure 2 Mortality rate of Aedes aegypti larvae fed with recombinant microalgae. A: Mortality rate of larvae fed with gat-shRNA transformed C. reinhardtii strains 1-5 (CC124: Larvae fed with wild-type C. reinhardtii); B: Mortality rate of larvae fed with gat-shRNA transformed Chlorella strains 1-5 (HOC5: Larvae fed with wild-type Chlorella). Fodder: Larvae fed with feed; p1302: Larvae fed with Chlorella transformed with the empty vector pCAMBIA1302; gat-p1302-1-gat-p1302-5: Larvae fed with Chlorella transformed with gat-shRNA.
2.3.2 饲喂shRNA重组微藻对伊蚊幼虫体长的影响
根据2.3.1节的结果,重组微藻对伊蚊幼虫的生长发育有显著影响。因此,设置2组实验,饲喂伊蚊幼虫4 d后,每组随机挑取5只幼虫,在显微镜下测量其体长(

图3 显微镜下伊蚊幼虫的体长。A:转基因小球藻饲喂伊蚊幼虫(HOC5:野生小球藻饲喂幼虫);B:转基因莱茵衣藻饲喂伊蚊幼虫(CC124:野生莱茵衣藻饲喂幼虫)。Water:用过滤水饲喂幼虫;Fodder:用饲料饲喂幼虫;p1302:转空载体pCAMBIA1302的莱茵衣藻饲喂幼虫;gat-p1302:转gat-shRNA莱茵衣藻饲喂幼虫。
Figure 3 Length of Aedes aegypti larvae under the microscope. A: Larvae fed with transgenic Chlorella (HOC5: Larvae fed with wild-type Chlorella); B: Larvae fed with transgenic C. reinhardtii (CC124: Larvae fed with wild-type C. reinhardtii). Water: Larvae fed with filtered water; Fodder: Larvae fed with feed; p1302: Larvae fed with C. reinhardtii transformed with the empty vector pCAMBIA1302; gat-p1302: Larvae fed with C. reinhardtii transformed with gat-shRNA.

图4 饲喂不同食物后伊蚊幼虫的体长。A:转gat-shRNA莱茵衣藻转化子1-5饲喂幼虫体长;B:转gat-shRNA小球藻转化子1-5喂饲幼虫体长。Water:用过滤水饲喂幼虫;Fodder:用饲料饲喂幼虫;HOC5:野生小球藻饲喂幼虫;p1302组:转空载体pCAMBIA1302的小球藻饲喂幼虫;gat-p1302-1-gat-p1302-5:转gat-shRNA小球藻饲喂幼虫。不同小写字母表示显著差异(P<0.05)。
Figure 4 Larval body length of Aedes aegypti after being fed different foods. A: Body length of larvae fed with gat-shRNA transformed C. reinhardtii strains 1-5; B: Body length of larvae fed with gat-shRNA transformed Chlorella strains 1-5. Water: Larvae fed with filtered water; Fodder: Larvae fed with feed; HOC5: Larvae fed with wild-type Chlorella; p1302: Larvae fed with Chlorella transformed with the empty vector pCAMBIA1302; gat-p1302-1-gat-p1302-5: Larvae fed with Chlorella transformed with gat-shRNA. Different small letters indicate significant difference (P<0.05).
2.3.3 饲喂shRNA微藻对重组伊蚊幼虫靶基因表达的影响
为了检测伊蚊幼虫饲喂重组微藻是否有效沉默靶基因的表达,选取饲喂第4天的幼虫通过qPCR技术检测靶基因表达水平。以饲喂野生CC124藻株、野生HOC5藻株和转空载体pCAMBIA1302的微藻为对照组,以RpS17作为内参基因。测定结果见

图5 饲喂shRNA重组微藻后伊蚊幼虫靶基因表达量。Fodder:用饲料饲喂幼虫;CC124:野生莱茵衣藻饲喂幼虫;HOC5:野生小球藻饲喂幼虫;gat-CC124:gat-shRNA莱茵衣藻饲喂幼虫;gat-HOC5:gat-shRNA小球藻饲喂幼虫。不同小写字母表示显著差异(P<0.05)。
Figure 5 Target gene expression levels in Aedes aegypti larvae after being fed shRNA recombinant microalgae. Fodder: Larvae fed with feed; CC124: Larvae fed with wild-type C. reinhardtii; HOC5: Larvae fed with wild-type Chlorella; gat-CC124: Larvae fed with gat-shRNA C. reinhardtii; gat-HOC5: Larvae fed with gat-shRNA Chlorella. Different small letters indicate significant difference (P<0.05).
2.4 饲喂shRNA重组微藻对伊蚊成虫致死情况
本研究分为3组:野生CC124藻株+10%蔗糖作为阴性对照;溴氰菊酯+10%蔗糖作为阳性对照;gat-shRNA莱茵衣藻+10%蔗糖作为实验组。成蚊落在蚊笼底端且无活动能力视为死亡。观察7 d的成蚊致死结果见

图6 转基因微藻对成蚊的致死率。CC124+10% sucrose:野生CC124藻株和10%蔗糖的混合液;Toxic+10% sucrose:0.1 mg/L溴氰菊酯和10%蔗糖的混合液;gat-p1302+10% sucrose:gat-shRNA莱茵衣藻和10%蔗糖的混合液。
Figure 6 Lethal rate of transgenic microalgae on adult mosquitoes. CC124+10% sucrose: A mixture of wild-type CC124 and 10% sucrose; Toxic+10% sucrose: Mixture of 0.1 mg/L deltamethrin and 10% sucrose; gat-p1302+10% sucrose: gat-shRNA mixture of C. reinhardtii and 10% sucrose.
3 讨论与结论
RNAi技术通过降低特定基因的表达来控制昆虫种群,为昆虫治理提供了一种新的方
Gat基因编码的蛋白对神经递质的转运至关重要。通过饲喂幼虫和成虫RNAi重组微藻来研究gat基因在伊蚊中的功能,结果显示,当伊蚊的gat基因受到干扰时,与对照组相比伊蚊的死亡率显著增加(
综上所述,使用gat RNAi重组微藻对蚊子进行处理显示出了明显的杀虫效果。由于微藻可以作为伊蚊幼虫的食物,并且在自然界中广泛存在,因此gat RNAi重组微藻在商业应用方面具有巨大潜力。然而,白纹伊蚊的生理过程极为复杂,目前的研究仅局限于mRNA表达水平的变化,对于蛋白质层面的影响尚未深入探讨。因此,未来的研究需要进一步扩展至蛋白质层面,以全面理解gat基因干扰的作用机制。同时,基于微藻RNAi的技术为蚊虫种群控制提供了新的途径。
作者贡献声明
唐欣欣:实验实施,结果分析,论文写作与修改;邓晓东:实验构思及设计,技术支持;黄小丹:实验实施;杨思琪:论文讨论及数据整理;薛春梅:论文讨论及修改;费小雯:实验构思及设计。
利益冲突
作者声明不存在任何可能会影响本文所报告工作的已知经济利益或个人关系。
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