Identification of ISVlu1-derived translocatable units containing optrA and/ or fexA genes generated by homologous or illegitimate recombination in Lactococcus garvieae of porcine origin

文献类型： 外文期刊

第一作者： Yang, Qin

作者： Yang, Qin;Wang, Xiumei;Zhu, Yao;Zhang, Wanjiang;Yang, Qin;Schwarz, Stefan;Schwarz, Stefan;Zhu, Yao;Zhang, Wanjiang

作者机构：

关键词： Oxazolidinones; OptrA; ISVlu1; Lactococcus garvieae

期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：2.4； 五年影响因子：2.6 ）

ISSN： 0378-1135

年卷期： 2024 年 292 卷

页码：

收录情况： SCI

摘要： The optrA gene encodes an ABC-F protein which confers cross-resistance to oxazolidinones and phenicols. Insertion sequence ISVlu1, a novel ISL3-family member, was recently reported to be involved in the transmission of optrA in Vagococcus lutrae. However, the role of ISVlu1 in mobilizing resistance genes has not yet fully explored. In this study, two complete and three truncated copies of ISVlu1 were found on plasmid pBN62-optrA from Lactococcus garvieae. Analysis of the genetic context showed that both optrA and the phenicols resistance gene fexA were flanked by the complete or truncated ISVlu1 copies. Moreover, three different-sized ISVlu1-based translocatable units (TUs) carrying optrA and/or fexA, were detected from pBN62-optrA. Sequence analysis revealed that the TU-optrA was generated by homologous recombination while TU-fexA and TU-optrA+fexA were the products of illegitimate recombinations. Importantly, conjugation assays confirmed that pBN62-optrA was able to successfully transfer into the recipient Enterococcus faecalis JH2-2. To our knowledge, this is the first report about an optrA-carrying plasmid in L. garvieae which could horizontally transfer into other species. More importantly, the ISVlu1-flanked genetic structures containing optrA and/or fexA were also observed in bacteria of different species, which underlines that ISVlu1 is highly active and plays a vital role in the transfer of some important resistance genes, such as optrA and fexA.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序