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Genome Instability in Lactobacillus rhamnosus GG

机译:鼠李糖乳杆菌GG的基因组不稳定性

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We describe here a comparative genome analysis of three dairy product isolates of Lactobacillus rhamnosus GG (LGG) and the ATCC 53103 reference strain to the published genome sequence of L. rhamnosus GG. The analysis showed that in two of three isolates, major DNA segments were missing from the genomic islands LGGISL1,2. The deleted DNA segments consist of 34 genes in one isolate and 84 genes in the other and are flanked by identical insertion elements. Among the missing genes are the spaCBA genes, which encode pilin subunits involved in adhesion to mucus and persistence of the strains in the human intestinal tract. Subsequent quantitative PCR analyses of six commercial probiotic products confirmed that two more products contain a heterogeneous population of L. rhamnosus GG variants, including genotypes with or without spaC . These results underline the relevance for quality assurance and control measures targeting genome stability in probiotic strains and justify research assessing the effect of genetic rearrangements in probiotics on the outcome of in vitro and in vivo efficacy studies.
机译:我们在这里描述了鼠李糖乳杆菌GG(LGG)和鼠李糖乳杆菌GG基因组序列的ATCC 53103参考菌株的三个乳制品分离株的比较基因组分析。分析表明,在三个分离株中的两个中,基因组岛LGGISL1,2中缺少主要的DNA片段。缺失的DNA片段由一个分离株中的34个基因和另一个分离株中的84个基因组成,并且两侧有相同的插入元件。在缺失的基因中有spaCBA基因,该基因编码菌毛蛋白亚基,这些蛋白与粘液的黏附和菌株在人肠道中的持久性有关。随后对六种商品益生菌产品进行的定量PCR分析证实,另外两种产品包含鼠李糖乳杆菌GG变体的异质种群,包括带有或不带有spaC的基因型。这些结果强调了针对益生菌菌株中基因组稳定性的质量保证和控制措施的相关性,并证明了评估益生菌基因重排对体外和体内功效研究结果的影响的研究是合理的。

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