多重实时荧光PCR检测牛、山羊和绵羊源性成分

Multiplex fluorescent real-time PCR detection of bovine,goat and sheep derived materials in animal products

根据牛、山羊和绵羊线粒体细胞色素b基因序列,设计特异性引物和以不同荧光素标记的Taqman探针。通过对PCR反应体系和反应条件的优化筛选,建立能同时鉴别牛、山羊和绵羊源性成分的多重实时荧光PCR方法。采用本文方法与国标GB/T20190-2006方法分别对17种不同源性动物DNA和200份不同来源样品DNA进行牛羊源性成分检测,数据显示两者检测结果符合率达100%,特异性相当。与国标方法相比,本试验方法不需电泳、酶切和测序,即可在一个PCR反应中同时鉴别检测牛、山羊和绵羊3种源性成分,检测效率提高近3倍;灵敏度更高,比国标方法灵敏10倍;适用性更广,除了饲料,还适用于肉品、奶品、生皮和动物油脂等动物产品的牛羊源性成分检测。

We designed the specific primers and TaqMan probes targeting cytochrome b genes of mitochondrial DNA from bovine, goat and sheep. We used different fluorescents to label the probes. After optimization of reaction conditions, we set up a multiplex fluorescent real-time PCR method to detect bovine, goat and sheep derived materials, simultaneously. We finished the detection tests of 17 kinds of animal DNA and 200 DNA samples from different sources with the developed method and the National Standard GB/T 20190Y-2006 routine PCR method. The coincidence rate of these two methods was 100%. Without electrophoresis or restriction digestion, the developed method could reduce the test time to one third as routine PCR and identify three kinds of animal derived materials including bovine, goat and sheep in one reaction. The developed method was approximately l0 times more sensitive than routine PCR, and was applicable to identifications of bovine, goat and sheep derived materials in feed stuff, meat, milk, pelt and grease, etc. The study showed that the developed real-time PCR method is a rapid, sensitive and efficacious detection assay for bovine, goat and sheep derived materials in animal products.