Huard Richard C, Lazzarini Luiz Claudio de Oliveira, Butler W Ray, van Soolingen Dick, Ho John L
Division of International Medicine and Infectious Diseases, Department of Medicine, Joan and Sanford I. Weill Medical College, Cornell University, New York, New York 10021, USA.
J Clin Microbiol. 2003 Apr;41(4):1637-50. doi: 10.1128/JCM.41.4.1637-1650.2003.
The classical Mycobacterium tuberculosis complex (MtbC) subspecies include Mycobacterium tuberculosis, Mycobacterium africanum (subtypes I and II), Mycobacterium bovis (along with the attenuated M. bovis bacillus Calmette-Guérin [BCG]), and Mycobacterium microti; increasingly recognized MtbC groupings include Mycobacterium bovis subsp. caprae and "Mycobacterium tuberculosis subsp. canettii." Previous investigations have documented each MtbC subspecies as a source of animal and/or human tuberculosis. However, study of these organisms is hindered by the lack of a single protocol that quickly and easily differentiates all of the MtbC groupings. Towards this end we have developed a rapid, simple, and reliable PCR-based MtbC typing method that makes use of MtbC chromosomal region-of-difference deletion loci. Here, seven primer pairs (which amplify within the loci 16S rRNA, Rv0577, IS1561', Rv1510, Rv1970, Rv3877/8, and Rv3120) were run in separate but simultaneous reactions. Each primer pair either specifically amplified a DNA fragment of a unique size or failed, depending upon the source mycobacterial DNA. The pattern of amplification products from all of the reactions, visualized by agarose gel electrophoresis, allowed immediate identification either as MtbC composed of M. tuberculosis (or M. africanum subtype II), M. africanum subtype I, M. bovis, M. bovis BCG, M. caprae, M. microti, or "M. canettii" or as a Mycobacterium other than MtbC (MOTT). This MtbC PCR typing panel provides an advanced approach to determine the subspecies of MtbC isolates and to differentiate them from clinically important MOTT species. It has proven beneficial in the management of Mycobacterium collections and may be applied for practical clinical and epidemiological use.
经典的结核分枝杆菌复合群(MtbC)亚种包括结核分枝杆菌、非洲分枝杆菌(I型和II型亚型)、牛分枝杆菌(以及减毒的卡介苗 [BCG])和田鼠分枝杆菌;越来越被认可的MtbC分类包括牛分枝杆菌山羊亚种和“结核分枝杆菌卡内蒂亚种”。先前的研究已将每个MtbC亚种记录为动物和/或人类结核病的来源。然而,由于缺乏一种能快速且轻松地区分所有MtbC分类的单一方案,对这些微生物的研究受到了阻碍。为此,我们开发了一种基于PCR的快速、简单且可靠的MtbC分型方法,该方法利用了MtbC染色体差异区域缺失位点。在此,七个引物对(在16S rRNA、Rv0577、IS1561'、Rv1510、Rv1970、Rv3877/8和Rv3120位点内进行扩增)在单独但同时的反应中运行。每个引物对要么特异性扩增出独特大小的DNA片段,要么扩增失败,这取决于来源分枝杆菌DNA。通过琼脂糖凝胶电泳可视化所有反应的扩增产物模式,可立即鉴定为结核分枝杆菌(或非洲分枝杆菌II型亚型)、非洲分枝杆菌I型亚型、牛分枝杆菌、卡介苗、山羊分枝杆菌、田鼠分枝杆菌或“卡内蒂分枝杆菌”组成的MtbC,或者鉴定为非MtbC的分枝杆菌(MOTT)。这个MtbC PCR分型板提供了一种先进的方法来确定MtbC分离株的亚种,并将它们与临床上重要的MOTT菌种区分开来。它已被证明在分枝杆菌菌种收集管理中有益,并且可用于实际临床和流行病学用途。