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Mycoplasma mycoides, from \mycoides Small Colony\ to \capri\. A microevolutionary perspective
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Mycoplasma mycoides, from \mycoides Small Colony\ to \capri\. A microevolutionary perspective
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Journal Article
Mycoplasma mycoides, from \mycoides Small Colony\ to \capri\. A microevolutionary perspective
2011
Overview
Background
The
Mycoplasma mycoides
cluster consists of five species or subspecies that are ruminant pathogens. One subspecies,
Mycoplasma mycoides
subspecies
mycoides
Small Colony (MmmSC), is the causative agent of contagious bovine pleuropneumonia. Its very close relative,
Mycoplasma mycoides
subsp.
capri
(Mmc), is a more ubiquitous pathogen in small ruminants causing mastitis, arthritis, keratitis, pneumonia and septicaemia and is also found as saprophyte in the ear canal. To understand the genetics underlying these phenotypic differences, we compared the MmmSC PG1 type strain genome, which was already available, with the genome of an Mmc field strain (95010) that was sequenced in this study. We also compared the 95010 genome with the recently published genome of another Mmc strain (GM12) to evaluate Mmc strain diversity.
Results
The MmmSC PG1 genome is 1,212 kbp and that of Mmc 95010 is ca. 58 kbp shorter. Most of the sequences present in PG1 but not 95010 are highly repeated Insertion Sequences (three types of IS) and large duplicated DNA fragments. The 95010 genome contains five types of IS, present in fewer copies than in PG1, and two copies of an integrative conjugative element. These mobile genetic elements have played a key role in genome plasticity, leading to inversions of large DNA fragments. Comparison of the two genomes suggested a marked decay of the PG1 genome that seems to be correlated with a greater number of IS. The repertoire of gene families encoding surface proteins is smaller in PG1. Several genes involved in polysaccharide metabolism and protein degradation are also absent from, or degraded in, PG1.
Conclusions
The genome of MmmSC PG1 is larger than that of Mmc 95010, its very close relative, but has less coding capacity. This is the result of large genetic rearrangements due to mobile elements that have also led to marked gene decay. This is consistent with a non-adaptative genomic complexity theory, allowing duplications or pseudogenes to be maintained in the absence of adaptive selection that would lead to purifying selection and genome streamlining over longer evolutionary times. These findings also suggest that MmmSC only recently adapted to its bovine host.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
/ Animal Genetics and Genomics
/ Animals
/ Bacteria
/ Bacterial Proteins - genetics
/ Comparative and evolutionary genomics
/ Comparative Genomic Hybridization
/ Decay
/ DNA
/ Female
/ Genetics
/ Genomes
/ Genomics
/ Microbial Genetics and Genomics
/ Molecular Sequence Annotation
/ Mycoplasma mycoides - genetics
/ Plasmids
