中文摘要：

目的评价不同串联重复序列（VNTR）位点组合在北京地区北京基因型结核分枝杆菌基因分型中的应用。方法采用多位点数目可变串联重复序列分析（MLVA）技术对72株北京地区北京基因型菌株的24个VNTR位点进行分析，基因多态性分析采用BioNumerics软件。结果24个位点的多态性差异较大，位点QUB-11b（HGI 0．651）、Mtub 21（HGI 0．556）和QUB-26（HGI 0．518）的多态性较高，有两个位点（MIRU2和MIRU24）则不具有多态性；不同VNTR位点组合（12位点，15位点，24位点）在北京基因型菌株中的分辨指数依次升高，分别为0．788，0．990．0．992，后两个组合的差异仅是由位点Mtub 29引起的。结论不同的VNTR位点在北京地区北京基因型菌株中的分辨力存在差异；推荐的基础VNTR15位点与Mtub 29组合可作为北京地区结核分枝杆菌分子流行病学研究的一线方法。

英文摘要：

The newly proposed variable-number tandem-repeat （VNTR） typing system, including basic 15-locus set and high-resolution 24-locus set, were evaluated in 72 Beijing genotype Mycobacterium tuberculosis isolated from Beijing area in China. As a result, 24 loci showed different discriminatory, in which QUB-11b （HGI 0. 651）, Mtub 21 （HGI 0. 556） and QUB-26 （HGI 0. 518） were the relatively more polymorphic loci, MIRU 2 and MIRU 24 had extremely low resolution among Beijing genotype strains （HGI 0）. The most widely used 12-locus set had limited power （HGI 0. 788） in this sample collection. A dramatically increased resolution was observed by using the proposed VNTR 15-locus and 24-locus set, with HGI of 0. 990 and 0. 992, respectively. The subtle difference in HGI was originated from one locus Mtub 29, which was included in 24-locus system. Thus, the proposed VNTR 15-locus plus Mtub 29 can be served as the first screening method in routine epidemiological study in Beijing area.