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Title Comparative "-omics" in Mycoplasma pneumoniae Clinical Isolates Reveals Key Virulence Factors

Authors Maria Lluch-Senar, Luca Cozzuto, Jaime Cano, Javier Delgado, Verónica Llórens-Rico, Sabine Pereyre, Cécile Bebear, Luis Serrano
Date 2015

Publisher PloS One
DOI 10.1371/journal.pone.0137354
Tag Adhesins, Bacterial, Antigenic Variation, Antigens, Bacterial, Bacterial Proteins, Bacterial Toxins, Base Sequence, Europe, Gene Expression Regulation, Bacterial, Genome, Bacterial, Humans, INDEL Mutation, Japan, Molecular Sequence Data, Mutation, Mycoplasma pneumoniae, Open Reading Frames, Pneumonia, Mycoplasma, Polymorphism, Single Nucleotide, Proteome, Transcriptome, Tunisia, Virulence

The human respiratory tract pathogen M. pneumoniae is one of the best characterized minimal bacterium. Until now, two main groups of clinical isolates of this bacterium have been described (types 1 and 2), differing in the sequence of the P1 adhesin gene. Here, we have sequenced the genomes of 23 clinical isolates of M. pneumoniae. Studying SNPs, non-synonymous mutations, indels and genome rearrangements of these 23 strains and 4 previously sequenced ones, has revealed new subclasses in the two main groups, some of them being associated with the country of isolation. Integrative analysis of in vitro gene essentiality and mutation rates enabled the identification of several putative virulence factors and antigenic proteins; revealing recombination machinery, glycerol metabolism and peroxide production as possible factors in the genetics and physiology of these pathogenic strains. Additionally, the transcriptomes and proteomes of two representative strains, one from each of the two main groups, have been characterized to evaluate the impact of mutations on RNA and proteins levels. This study has revealed that type 2 strains show higher expression levels of CARDS toxin, a protein recently shown to be one of the major factors of inflammation. Thus, we propose that type 2 strains could be more toxigenic than type 1 strains of M. pneumoniae.

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