红曲菌株鉴别中SCAR分子标记的应用

Application of SCAR molecular marker technology in identification of Monascus strains

目的:建立一套基于DNA遗传标记技术的红曲菌株快速鉴定方法。方法:采用RAPD方法对分离收集的10个红曲菌株进行多态性分析,从菌株F中获得1个421 bp的特异RAPD标记片段F421。Blast分析未发现F421序列(GenBank登录号EF063107)与GenBank中相关序列有较高同源性。根据该序列设计特意引物,对10个红曲菌株进行PCR检测。结果:利用所获得的特征性片段扩增区域(SCAR)标记能能在1 d内准确地鉴别出红曲F菌株。结论:利用SCAR分子标记技术对红曲菌株进行分类鉴别是红曲研究领域的新尝试,为推广应用SCAR分子标记技术对药用真菌进行菌株快速准确鉴定提供技术依据。

Objective： To establish an effective way for rapid identification of Monascus strains based on DNA molecular marker. Method.. A random amplified polymorphic DNA （RAPD） marker named F421 in genomic DNA of Monascus F strain was observed during a comparison of DNA fingerprints derived from 10 cultivated strains of Monascus. F421 was cloned and sequenced. Comparing the sequence of F421 （GenBank accession number EF063107） with other relative sequences in the GenBank databases, no distinct comparability was found. A pair of sequence characterized amplified region （SCAR） primers were designed based on the sequence of the cloned fragment and tested for the specific detection of Monascus F. Result： The results of polymerase chain reaction showed that only a 421bp segment of Monascus F strain was amplified compared with other 9 cultivated strains of Monascus. And the acquired SCAR marker of strain F could be used as a specific DNA fingerprint to identify Monascus strain F within one day. Conclusion-SCAR molec-ular marker technology is an effective new way to identify Monascus strains more rapidly. And also is an assistant tool to identify Monascus strains more accurately when disagreements come out using traditional classification. It could be applied widely to the protection of germ plasm resources, classification and identification distinguishing false strains of pharmaceutical fungi.