Shiga toxin 2 overexpression in Escherichia coli O157:H7 strains associated with severe human disease.

Shiga toxin 2 overexpression in Escherichia coli O157:H7 strains associated with severe human disease.
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DOI:
10.1016/j.micpath.2011.07.009
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发表时间:
2011-12
影响因子:
3.8
通讯作者:
Riordan JT
Riordan JT
中科院分区:
医学3区
文献类型:
--
作者:
Neupane M;Abu-Ali GS;Mitra A;Lacher DW;Manning SD;Riordan JT

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大肠杆菌O157:H7感染中疾病严重程度的差异可能是由于志贺毒素2的不同表达(Stx2)。通过实时荧光定量PCR和western blot分析,研究了11个菌株的stx2表达情况,这些菌株属于4个突出的系统发育分支,包括2006年美国菠菜爆发的代表分支8菌株。与进化枝1-3的菌株相比,进化枝8菌株在环丙沙星诱导下基本过表达stx2。stx2表达差异一般与stx2蛋白水平相关。在进化枝8菌株中发现的stx2AB上游区域的单核苷酸多态性在非进化枝8菌株中基本不存在。本研究得出结论,stx2过表达在与溶血性尿毒症综合征相关的进化枝8菌株中是常见的,并描述了可能影响stx2表达的snp,这可能对高毒力菌株的遗传分化有用。
Variation in disease severity among E. coli O157:H7 infections may result from differential expression of Shiga toxin 2 (Stx2). Eleven strains belonging to four prominent phylogenetic clades, including clade 8 strains representative of the 2006 U.S. spinach outbreak, were examined for stx2 expression by real-time PCR and western blot analysis. Clade 8 strains were shown to overexpress stx2 basally, and following induction with ciprofloxacin when compared to strains from clades 1-3. Differences in stx2 expression generally correlated with Stx2 protein levels. Single-nucleotide polymorphisms identified in regions upstream of stx2AB in clade 8 strains were largely absent in non-clade 8 strains. This study concludes that stx2 overexpression is common to strains from clade 8 associated with hemolytic uremic syndrome, and describes SNPs which may affect stx2 expression and which could be useful in the genetic differentiation of highly-virulent strains.
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