Multiple major disease-associated clones of Legionella pneumophila have emerged recently and independently.

Abstract:

:Legionella pneumophila is an environmental bacterium and the leading cause of Legionnaires' disease. Just five sequence types (ST), from more than 2000 currently described, cause nearly half of disease cases in northwest Europe. Here, we report the sequence and analyses of 364 L. pneumophila genomes, including 337 from the five disease-associated STs and 27 representative of the species diversity. Phylogenetic analyses revealed that the five STs have independent origins within a highly diverse species. The number of de novo mutations is extremely low with maximum pairwise single-nucleotide polymorphisms (SNPs) ranging from 19 (ST47) to 127 (ST1), which suggests emergences within the last century. Isolates sampled geographically far apart differ by only a few SNPs, demonstrating rapid dissemination. These five STs have been recombining recently, leading to a shared pool of allelic variants potentially contributing to their increased disease propensity. The oldest clone, ST1, has spread globally; between 1940 and 2000, four new clones have emerged in Europe, which show long-distance, rapid dispersal. That a large proportion of clinical cases is caused by recently emerged and internationally dispersed clones, linked by convergent evolution, is surprising for an environmental bacterium traditionally considered to be an opportunistic pathogen. To simultaneously explain recent emergence, rapid spread and increased disease association, we hypothesize that these STs have adapted to new man-made environmental niches, which may be linked by human infection and transmission.

journal_name

Genome Res

journal_title

Genome research

authors

David S,Rusniok C,Mentasti M,Gomez-Valero L,Harris SR,Lechat P,Lees J,Ginevra C,Glaser P,Ma L,Bouchier C,Underwood A,Jarraud S,Harrison TG,Parkhill J,Buchrieser C

doi

10.1101/gr.209536.116

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

1555-1564

issue

11

eissn

1088-9051

issn

1549-5469

pii

gr.209536.116

journal_volume

26

pub_type

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