Chronology and pattern of integration of tandem genomic islands associated with the tmRNA gene in Escherichia coli and Salmonella enterica

被引:0
|
作者
SONG Lei~1
2 College of Life and Environmental Sciences
机构
基金
中国国家自然科学基金;
关键词
genomic island; tmRNA gene; multiple integration; integration chronology;
D O I
暂无
中图分类号
Q522 [核糖(醣)核酸(RNA)];
学科分类号
071010 ; 081704 ;
摘要
tmRNA,a combination of a tRNA-related fragment and a small mRNA fragment,was confirmed as the integration site of genomic islands(GIs).Using sequence alignment and comparative genomics,68 GIs associated with tmRNA genes were identified among 13 genera of Enterobacteriaceae.Among them,53 GIs were found in Escherichia coli and Salmonella enterica.Among these 53 GIs,tandem GIs were verified in eight S.enterica and two E.coli chromosomes.The downstream regions of the tmRNA genes in most of the E.coli and S.enterica chromosomes include one GI or tandem GIs region and a remnant variable region distal to the tmRNA.The chronology of integration of tandem GIs into the genome indicated that GIs farther from the tmRNA were incorporated into the genome earlier than those nearer from the tmRNA.The integrases of the tmRNA gene-associated GIs can be further categorized into three subtypes:HP1 integrases,PhiCTX integrases,and P4 integrases,which are the most predominant.The GIs were first integrated into the chromosome by the P4 integrase,subsequently by the PhiCTX integrase,and finally by the HP1 integrase.Thus,the tmRNA gene is an important site for investigating the genetics and evolution of tandem GIs.
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页码:3836 / 3844
页数:9
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