A new method for quantitative detection of Lactobacillus casei based on casx gene and its application

文献类型： 外文期刊

第一作者： Pang, Xiaoyang

作者： Pang, Xiaoyang;Zhang, Min;Pang, Xiaoyang;Jia, Ziyang;Lu, Jing;Zhang, Shuwen;Lv, Jiaping;Zhang, Cai

作者机构：

关键词： TaqMan MGB RT-PCR; Lactobacillus casei; Cas; Rapid detection method; 16 s rRNA

期刊名称：BMC BIOTECHNOLOGY （ 影响因子：2.563； 五年影响因子：3.292 ）

ISSN：

年卷期： 2019 年 19 卷 1 期

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收录情况： SCI

摘要： Background: The traditional method of bacterial identification based on 16S rRNA is a widely used and very effective detection method, but this method still has some deficiencies, especially in the identification of closely related strains. A high homology with little differences is mostly observed in the 16S sequence of closely related bacteria, which results in difficulty to distinguish them by 16S rRNA-based detection method. In order to develop a rapid and accurate method of bacterial identification, we studied the possibility of identifying bacteria with other characteristic fragments without the use of 16S rRNA as detection targets. Results: We analyzed the potential of using cas (CRISPR-associated proteins) gene as a target for bacteria detection. We found that certain fragment located in the casx gene was species-specific and could be used as a specific target gene. Based on these fragments, we established a TaqMan MGB Real-time PCR method for detecting bacteria. We found that the method used in this study had the advantages of high sensitivity and good specificity. Conclusions: The casx gene-based method of bacterial identification could be used as a supplement to the conventional 16 s rRNA-based detection method. This method has an advantage over the 16 s rRNA-based detection method in distinguishing the genetic relationship between closely-related bacteria, such as subgroup bacteria, and can be used as a supplement to the 16 s rRNA-based detection method.

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