College of Veterinary Medicine, Northwest A&F University, No. 22 Xinong Road, Yangling 712100, Shaanxi, China; UCD-Centre for Food Safety, School of Public Health, Physiotherapy and Sports Science, University College Dublin, Belfield, Dublin D04 N2E5, Ireland.
Institute of laboratory animal sciences, CAMS&PUMC, No. 5, Chaoyang District, Panjiayuan South Lane, Beijing, China.
Vet Microbiol. 2017 Oct;210:142-146. doi: 10.1016/j.vetmic.2017.08.024. Epub 2017 Sep 14.
One mcr-1-carrying Salmonella enterica serovar Indiana strain D90, was identified from 1320 Salmonella enterica isolates from poultry slaughterhouse in 2012 in China. The objective of this study was to verify the transferability of the mcr-1 gene and also completely characterize the sequence of the strain at the whole-genome level. Broth matting assays were carried out to detect the transferability and whole-genome sequencing (WGS) of S. enterica serovar Indiana D90 was performed using the PacBio RS II system. Open reading frames were assigned using Rapid Annotation using Subsystem Technology (RAST) and analysed by BLASTn and BLASTp. Salmonella Pathogenisity Islands (SPIs) were annotated by SPIFinder platform. The complete genome sequence of S. enterica serovar Indiana D90 contained a circular 4,779,514-bp chromosome and four plasmids. Genome analysis and sequencing revealed that 24 multi-drug resistance (MDR) genes were located on plasmids. The largest plasmid pD90-1, was found to be of an IncHI2/HI2A/Q1/N type that encoded a bla gene along with 20 additional antimicrobial resistance genes. A 60.5-kbp IncI2 plasmid pD90-2 contained a nikA-nikB-mcr-1 genetic structure, that can be successfully transferred to E. coli and S. enterica serovar Typhimurium at low transfer rates. Interestingly, comparative sequence analysis revealed the plasmids pD90-1 and pD90-2 showed considerable nucleotide similarity to pHNSHP45-2 and pHNSHP45, respectively. Moreover, the genome and the plasmid pD90-2 also showed high similarity to one carbapenem resistant S. enterica serovar Indiana strain, C629 and its plasmid pC629, respectively. This is the first report of the complete nucleotide sequence of one mcr-1-carrying MDR S. enterica serovar Indiana strain.
2012 年,从中国一家家禽屠宰场的 1320 株沙门氏菌分离株中鉴定出一株携带 mcr-1 的肠炎沙门氏菌血清型印第安纳菌株 D90。本研究的目的是验证 mcr-1 基因的可转移性,并在全基因组水平上对该菌株的序列进行全面表征。通过肉汤配对试验检测可转移性,使用 PacBio RS II 系统对肠炎沙门氏菌血清型印第安纳 D90 进行全基因组测序(WGS)。使用 Rapid Annotation using Subsystem Technology (RAST) 分配开放阅读框,并通过 BLASTn 和 BLASTp 进行分析。使用 SPIFinder 平台注释沙门氏菌致病性岛(SPIs)。肠炎沙门氏菌血清型印第安纳 D90 的全基因组序列包含一个圆形的 4779514-bp 染色体和四个质粒。基因组分析和测序表明,24 个多药耐药(MDR)基因位于质粒上。最大的质粒 pD90-1 为 IncHI2/HI2A/Q1/N 型,编码 bla 基因以及 20 个额外的抗生素耐药基因。一个 60.5-kbp IncI2 质粒 pD90-2 包含 nikA-nikB-mcr-1 遗传结构,可以以低转移率成功转移到大肠杆菌和肠炎沙门氏菌血清型 Typhimurium。有趣的是,比较序列分析显示,质粒 pD90-1 和 pD90-2 与 pHNSHP45-2 和 pHNSHP45 分别具有相当的核苷酸相似性。此外,基因组和质粒 pD90-2 与一株耐碳青霉烯的肠炎沙门氏菌血清型印第安纳菌株 C629 及其质粒 pC629 也具有高度相似性。这是首例 mcr-1 携带的多重耐药肠炎沙门氏菌血清型印第安纳菌株的全核苷酸序列报告。