Establishment and application of a loop-mediated isothermal amplification method based on MetAP2 gene for the detection of Nosema bombycis in silkworms (Bombyx mori).

IF 2.6 2区 农林科学 Q1 VETERINARY SCIENCES
Frontiers in Veterinary Science Pub Date : 2025-03-10 eCollection Date: 2025-01-01 DOI:10.3389/fvets.2025.1549224
Izhar Hyder Qazi, Ting Yuan, Sijia Yang, Christiana Angel, Jiping Liu
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引用次数: 0

Abstract

Pebrine, caused by Nosema bombycis, is a devastating disease of silkworms that causes huge economic losses to the sericulture farmers. Although pebrine is a quarantine disease, currently the development of effective molecular diagnostic or therapeutic tools for its management is still a lagging hotspot in sericulture research. In the present study, a highly specific, sensitive, and field-applicable LAMP assay targeting MetAp2 gene was developed. LM1 primer set produced better results, with fluorescence (amplification) signals appearing in ~50 min. The reaction temperature of 60.9°C and outer primer to inner primer ratio of 1:8 were found to be optimal, with the shortest amplification time and strongest fluorescence intensity. The LAMP assay showed high specificity for the DNA of Nosema bombycis spores, as the templates of other common microorganisms of silkworms showed no amplification. The LAMP assay detected pMD-19T-met positive plasmid at the lowest concentration of 103 copies, with a detection time of ~80 min. The practicality test showed that the LAMP assay can detect Nosema bombycis spore DNA at the lowest concentration of 10-3 ng/μL. At concentration of 1.2 ng/μL, the real-time fluorescence signals appeared in ~60 min. The LAMP assay detected Nosema bombycis at all life stages of untreated silkworms. In fumagillin treated silkworms, no real-time fluorescence amplification was observed at 90 h and later, indicating the reliability of LAMP in detecting Nosema bombycis, and effectiveness of fumagillin, to some degree, in treating pebrine infection. The developed LAMP assay holds good promise for its application as a specific and field-applicable tool for the detection/control of pebrine in the field settings.

基于MetAP2基因的家蚕微孢子虫环介导等温扩增检测方法的建立及应用
由家蚕微孢子虫(Nosema bombycis)引起的微孢子虫病(Pebrine)是一种毁灭性的蚕病,给养蚕户造成了巨大的经济损失。虽然微卤是一种检疫性疾病,但目前开发有效的分子诊断或治疗工具对其进行管理仍是蚕桑研究的滞后热点。在本研究中,我们开发了一种针对MetAp2基因的高度特异性、敏感性和适用于野外的LAMP检测方法。LM1引物组效果较好,在~50 min出现荧光(扩增)信号,反应温度为60.9℃,外引物与内引物的比例为1:8,扩增时间最短,荧光强度最强。LAMP法对家蚕微孢子的DNA具有较高的特异性,而对家蚕其他常见微生物的DNA模板没有扩增。LAMP法检测pMD-19T-met阳性质粒的最低浓度为103拷贝,检测时间为~80 min。实用性试验表明,LAMP法可以在最低浓度为10-3 ng/μL时检测到小孢子DNA。在浓度为1.2 ng/μL时,约60 min内出现实时荧光信号。LAMP法在未处理家蚕的所有生命阶段检测到家蚕微孢子虫。在富马青霉素处理的家蚕中,90 h及以后没有观察到实时荧光扩增,说明LAMP检测家蚕微孢子虫的可靠性,也说明富马青霉素在一定程度上治疗微孢子虫感染的有效性。开发的LAMP测定法具有良好的应用前景,可作为现场环境中微盐水检测/控制的特定和适用的工具。
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来源期刊
Frontiers in Veterinary Science
Frontiers in Veterinary Science Veterinary-General Veterinary
CiteScore
4.80
自引率
9.40%
发文量
1870
审稿时长
14 weeks
期刊介绍: Frontiers in Veterinary Science is a global, peer-reviewed, Open Access journal that bridges animal and human health, brings a comparative approach to medical and surgical challenges, and advances innovative biotechnology and therapy. Veterinary research today is interdisciplinary, collaborative, and socially relevant, transforming how we understand and investigate animal health and disease. Fundamental research in emerging infectious diseases, predictive genomics, stem cell therapy, and translational modelling is grounded within the integrative social context of public and environmental health, wildlife conservation, novel biomarkers, societal well-being, and cutting-edge clinical practice and specialization. Frontiers in Veterinary Science brings a 21st-century approach—networked, collaborative, and Open Access—to communicate this progress and innovation to both the specialist and to the wider audience of readers in the field. Frontiers in Veterinary Science publishes articles on outstanding discoveries across a wide spectrum of translational, foundational, and clinical research. The journal''s mission is to bring all relevant veterinary sciences together on a single platform with the goal of improving animal and human health.
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