大熊猫轮状病毒可视化LAMP检测技术的建立及应用
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成都大熊猫繁育研究基金会项目(CPF研2012–12)


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    摘要:

    根据大熊猫轮状病毒CH–1株VP4基因设计3对引物,建立大熊猫轮状病毒可视化环介导等温扩增(LAMP)检测技术,对其反应条件进行优化及特异性和灵敏度进行验证。结果表明:用可视化LAMP方法检测大熊猫轮状病毒时,在62 ℃条件下,反应体系中加入终浓度为8 mmol/L Mg2+、0.6 mol/L甜菜碱、12 U Bst DNA聚合酶和1×LAMP可见光染料,扩增40 min后,阳性样本颜色由紫色变为蓝色,电泳分析扩增产物可观察到明显的梯状条带;用建立的LAMP方法对大熊猫轮状病毒进行扩增,特异性好;其批内及批间的变异系数均小于1%,重复性好;其最低检测限为5×10–5 ng/μL RNA,灵敏度比常规PCR高约100倍;采用该方法检测50份大熊猫粪便样的轮状病毒,共检测到阳性样本22份,比常规PCR方法检测到的阳性样本多5份,与荧光定量PCR方法的吻合度为100%。可见,用LAMP方法检测大熊猫轮状病毒具有操作简便、反应时间短、特异性强、结果判定快速等特点,可用于临床上大熊猫轮状病毒的快速检测。

    Abstract:

    In this study, three pairs of primers were designed based on the VP4 gene of giant panda rotavirus strain CH-1. A loop-mediated isothermal amplification(LAMP) detection technique of giant panda rotavirus was developed to optimize the reaction conditions and verify its specificity and sensitivity. The results showed that under the condition of 62 ℃, to join the final concentration of 8 mmol/L Mg2+, 0.6 mol/L betaine, 12 U DNA polymerase, ladder banding could be observed clearly after 40 min amplification. 1×LAMP visible light dye was added into the system to directly judge the amplification result by color change. When positive amplification occurred, the sample color changed from purple to blue. The LAMP detection was of high specificity and only amplified for giant panda rotavirus. The coefficient of variation within and between batches was less than 1%. With a sensitivity 100 times higher than that of conventional PCR and a minimum detection limit of 5×10-5 ng/μL RNA. The method was used to detect rotavirus in 50 samples of giant panda feces, and a total of 22 positive samples were detected, which was 100% consistent with the fluorescence quantitative PCR method. In summary, this method is simple to operate, short reaction time, strong specificity and fast result determination, and can be used for rapid detection of giant panda rotavirus in clinic.

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蒋金蓁,张白玉,杨锐,颜其贵.大熊猫轮状病毒可视化LAMP检测技术的建立及应用[J].湖南农业大学学报:自然科学版,2021,47(1):.

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  • 在线发布日期: 2021-01-29
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