文献类型： 外文期刊

作者： Shen, Haiyan ¹ ; Wen, Junping ⁴ ; Liao, Xinmeng ⁹ ; Lin, Qijie ⁴ ; Zhang, Jianfeng ¹ ; Chen, Kaifeng ⁴ ; Wang, Shaojun ⁴ ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Anim Hlth, Guangzhou, Peoples R China

2.Minist Agr, Sci Observat & Expt Stn Vet Drugs & Diagnost Tech, Lab Livestock Dis Prevent Guangdong Prov, Guangzhou, Guangdong, Peoples R China

3.Guangdong Lab Lingnan Modern Agr, Maoming Branch, Guangzhou, Guangdong, Peoples R China

4.South China Agr Univ, Coll Vet Med, Minist Agr, Natl & Reg Joint Engn Lab Medicament Zoonoses Pre, Guangzhou, Peoples R China

5.South China Agr Univ, Coll Vet Med, Minist Agr, Key Lab Zoonoses, Guangzhou, Peoples R China

6.South China Agr Univ, Coll Vet Med, Minist Agr, Key Lab Zoonoses Prevent & Control Guangdong Prov, Guangzhou, Peoples R China

7.South China Agr Univ, Coll Vet Med, Minist Agr, Key Lab Anim Vaccine Dev, Guangzhou, Peoples R China

8.South China Agr Univ, Coll Vet Med, Guangdong Lab Lingnan Modern Agr, Guangzhou, Peoples R China

9.Southern Med Univ, Sch Lab Med & Biotechnol, Guangzhou, Peoples R China

关键词： Salmonella pullorum; single-nucleotide polymorphism; rapid detection; RNase H2 enzyme; loop-primer probe introduced loop-mediated isothermal amplification

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：5.64； 五年影响因子：6.32 ）

ISSN： 1664-302X

年卷期： 2020 年 11 卷

页码：

收录情况： SCI

摘要： S. Pullorum(Salmonellaenterica serovar Gallinarum biovars Pullorum) is an infectious pathogen that causes the acute systemic disease called Pullorum disease in poultry. This disease causes huge losses to the poultry industry and seriously affects the yield and quality of the chicken product. It is not easily distinguishable with fowl typhoid caused byS.Gallinarum (Salmonellaenterica serovar Gallinarum biovars Gallinarum), hence the development of a specific and rapid detection method for this pathogen is highly desired. In this study, we propose a novel single-nucleotide polymorphism (SNP) detection strategy termed loop primer probe-introduced loop-mediated isothermal amplification (LP-LAMP) forS.Pullorum detection. Based on the original primer sets, we targeted the nucleotide position 237 of the rfbS gene sequence to design a new modified loop-primer probe with a ribonucleotide insertion, where activity of the enzyme ribonuclease H2 (RNase H2) is only activated when the probe is perfectly complementary, leading to the hydrolytic release of a quencher moiety and thus an amplified signal. The method exhibits robust specificity and a low detection limit as the copy number and genomic DNA is 21 copies/mu L and 4.92 pg/mu L, respectively. This method showed great performance in real sample testing of 130 samples of embryos, livers, and anal swabs from chickens in poultry farms. The experimental results are mainly consistent with traditional identification methods and a PCR method reported in the past. However, the other two methods still contain some false negative results, while our method is without miss detection. The entire closed-tube reaction process can be accomplished within 40 min at a constant temperature (61 degrees C) without the need for expensive instruments or a complicated operation. The LP-LAMP strategy established in this study not only overcomes the existing difficulties ofS.Pullorum rapid detection, it also provides a novel, sensitive, and highly specific detection platform for SNPs that is suitable for clinical use.