Genomic comparative analysis of the environmental Enterococcus mundtii against enterococcal representative species

BMC Genomics

Christian Magni¹  Luis Esteban²  Cristian A Suárez¹  Víctor S Blancato¹  Martín Espariz¹  Guillermo D Repizo¹ 

[1] Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET) and Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario S2002LRK, Argentina;Departamento de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Rosario, Santa Fe 3100, Rosario S2002LRK, Argentina

关键词: Genomic comparative analysis;    Enterococcus mundtii;    Enterococcus;   

Others  :  1216573
DOI  :  10.1186/1471-2164-15-489

 received in 2013-10-01, accepted in 2014-06-02,  发布年份 2014

【 摘 要 】

Background

Enterococcus mundtii is a yellow-pigmented microorganism rarely found in human infections. The draft genome sequence of E. mundtii was recently announced. Its genome encodes at least 2,589 genes and 57 RNAs, and 4 putative genomic islands have been detected. The objective of this study was to compare the genetic content of E. mundtii with respect to other enterococcal species and, more specifically, to identify genes coding for putative virulence traits present in enterococcal opportunistic pathogens.

Results

An in-depth mining of the annotated genome was performed in order to uncover the unique properties of this microorganism, which allowed us to detect a gene encoding the antimicrobial peptide mundticin among other relevant features. Moreover, in this study a comparative genomic analysis against commensal and pathogenic enterococcal species, for which genomic sequences have been released, was conducted for the first time. Furthermore, our study reveals significant similarities in gene content between this environmental isolate and the selected enterococci strains (sharing an “enterococcal gene core” of 805 CDS), which contributes to understand the persistence of this genus in different niches and also improves our knowledge about the genetics of this diverse group of microorganisms that includes environmental, commensal and opportunistic pathogens.

Conclusion

Although E. mundtii CRL1656 is phylogenetically closer to E. faecium, frequently responsible of nosocomial infections, this strain does not encode the most relevant relevant virulence factors found in the enterococcal clinical isolates and bioinformatic predictions indicate that it possesses the lowest number of putative pathogenic genes among the most representative enterococcal species. Accordingly, infection assays using the Galleria mellonella model confirmed its low virulence.

【 授权许可】

   
2014 Repizo et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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Figure 3.

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