Journal of Jilin University(Medicine Edition) ›› 2021, Vol. 47 ›› Issue (1): 180-186.doi: 10.13481/j.1671-587x.20210125

• Research in clinical medicine • Previous Articles     Next Articles

Genomic evolution and drug resistance analysis of human-derived Listeria monocytogenes

Guang YAO,Yuying LU,Qinghua ZHANG,Haixia ZHU,Yiwei CHEN,Dong SUN,Zhen ZHUANG,Feng ZHANG,Ding LIU,Zhi SONG()   

  1. Department of Neurology,Third Xiangya Hospital,Central South University,Changsha 410008,China
  • Received:2020-05-09 Online:2021-01-28 Published:2021-01-27
  • Contact: Zhi SONG E-mail:docsong@126.com

Abstract: Objective

To identify the Listeria monocytogenes(LM) obtained from the cerebrospinal fluid of one patient with meningitis with new generation sequencing technology and analyze genomic evolution and drug resistance, and to explore the possible causes of rapid progression of disease and treatment failure.

Methods

The LM were cultivated, isolated and identified from the patient’s cerebrospinal fluid, and bacterial De novo sequencing was conducted by the Illumina HiSeq 3000 system to obtain the whole genome data of the strain.Furthermore, the evolutionary tree of the LM was constructed and the drug-resistant related genes were identified by gene assembly, gene prediction, gene annotation, single nucleotide polymorphism(SNP) analysis, and phylogenetic analysis and other bioinformatics methods.

Results

The bacteria in the cerebrospinal fluid were isolated and cultured, and identified as LM by mass spectrometry.The size of the assembled bacterial genome after sequencing was 3 008 507 bp.By aligned with database, its genome was accordance with 88% of LM genome, confirming that the bacteria was LM.The obtained listeria strains were close to FSL N1-017 and SLCC2540 by aligning 38 representative listeria genome construction phylogenetic trees in the NCBI database,and they had no evolutionary relationships with human-derived LM that were reported worldwide. It was considered to be a newly discovered clinically infectious LM in China.The drug resistance analysis revealed that the obtained LM genome contained some drug-resistant genes associated with the major facilitator superfamily(MFS)transporters,and four of them were matched the drug resistance genes in the database EDG-e strain transporter annotation, suggesting that the strain had strong clinical resistance.

Conclusion

The cultured bacteria from cerebrospinal fluid of clinical meningitis patient is identified as a new type of clinically infectious pathogenic LM strain with strong clinical drug resistance.

Key words: Listeria monocytogenes, meningitis, whole genome sequencing, major facilitator superfamily transporter, drug resistance

CLC Number: 

  • R446.5