摘要:本研究根据从NCBI数据库中下载到的84条DHAV-1的VP1基因核酸序列的比对结果,设计出了一对可特异性扩增140bp片段的上、下游引物及相应的TaqMan探针,通过对引物浓度、探针浓度及退火温度的优化,建立了Ⅰ (甲)型鸭肝炎病毒1系(DHAV-1)的实时荧光定量RT-PCR检测方法,并对该方法的特异性、敏感性和重复性进行了分析。结果表明,该检测方法呈现出典型的S型扩增曲线,能扩增出目的条带,其敏感性能达到1×102拷贝,批内重复及批间重复的变异系数均小于5%。同时特异性分析表明,本方法对其他七种常感染鸭的病原的检测结果均呈阴性。
关键词:甲型鸭肝炎病毒;实时荧光定量RT-PCR;特异性;敏感性;重复性
Establishment of fluorescent quantitative PCR for duck hepatitis A virus 1 strain (DHAV-1)
Abstrac: In this study, a pair of upstream and downstream primers and corresponding TaqMan probes that can specifically amplify 140bp were designed based on the comparison of 84 VP1 gene nucleic acid sequences of DHAV-1, downloaded from NCBI database. By optimizing the concentration of primer, probe and annealing temperature, a real-time fluorescence quantitative RT-PCR detection method of duck hepatitis A virus 1 strain (DHAV-1) was established, and its specificity, sensitivity and repeatability were optimized. The results showed that this method exhibited a typical s-type amplification curve, which could specifically amplify the target fragment of about 140bp-sized. Its sensitivity reached 102 copies, and the coefficient of variation of intra- and inter-assay tests’ repetition was less than 5%. At the same time, the detection result of other seven ducks pathogens with this method were negative.
Key words: DHAV; qRT-PCR; Specificity; Sensitivity; Repeatability
目 录
摘要 1
关键词 1
Abstract 1
Key words 1
引言 1
1材料 2
1.1主要仪器 2
1.2主要试剂 2
1.3模板毒株 3
1.4载体与菌株 3
2方法 3
2.1引物与探针 3
2.2标准阳性质粒构建 4
2.3荧光定量PCR反应条件优化 8
2.4特异性、敏感性与重复性检验 8
3结果 8
3.1引物选择 8
3.2最佳引物、探针浓度及退火温度 9
3.3特异性检验结果 9
3.4敏感性检验结果 10
3.5重复性检验结果 11
4讨论 11
致谢 12
参考文献 13
Ⅰ 型1系鸭肝炎病毒(DHAV-1)实时荧光定量RT-PCR检测方法的建立
鸭病毒性肝炎是由鸭肝炎病毒(DHV)引起的一种具有高度传染性和致死性的病毒性疾病。病鸭早期阶段会出现精神沉郁、食欲不振、行动呆滞迟缓的症状,常蹲伏于地不愿四处走动觅食,半闭眼呈昏睡状[6]。雏鸭在发病后期死亡时常伴有较明显的神经症状,如双翅下垂、双腿痉挛抽搐,头颈向后背部扭曲呈现角弓反张的姿势,剖检可见明显的肝脏的水肿、出血和坏死[7]。幼龄的雏鸭对鸭肝炎病毒极易感,雏鸭的日龄越小则死亡率越高;后期随着雏鸭日龄的增加,将会逐渐获得免疫保护,死亡率明显下降。成年鸭几乎不发病,但大部分成年鸭呈隐性感染状态,可作为传染源,不断向外界排毒。因此,有必要做好针对DHV的预防和鉴别诊断工作,防止鸭病毒性肝炎的大规模爆发,减少经济损失,促进我国水禽养殖业发展。 Ⅰ型1系鸭肝炎病毒(DHAV-1)实时荧光定量RT-PCR检测方法的建立:http://www.chuibin.com/yixue/lunwen_206218.html

