Evolutionary Dynamics of Pathoadaptation Revealed by Three Independent Acquisitions of the VirB/D4 Type IV Secretion System in Bartonella.

Détails

Ressource 1Télécharger: evx042.pdf (3344.94 [Ko])
Etat: Serval
Version: Final published version
ID Serval
serval:BIB_2E0AC829D502
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Evolutionary Dynamics of Pathoadaptation Revealed by Three Independent Acquisitions of the VirB/D4 Type IV Secretion System in Bartonella.
Périodique
Genome Biology and Evolution
Auteur(s)
Harms A., Segers F.H., Quebatte M., Mistl C., Manfredi P., Körner J., Chomel B.B., Kosoy M., Maruyama S., Engel P., Dehio C.
ISSN
1759-6653 (Electronic)
ISSN-L
1759-6653
Statut éditorial
Publié
Date de publication
2017
Peer-reviewed
Oui
Volume
9
Numéro
3
Pages
761-776
Langue
anglais
Résumé
The α-proteobacterial genus Bartonella comprises a group of ubiquitous mammalian pathogens that are studied as a model for the evolution of bacterial pathogenesis. Vast abundance of two particular phylogenetic lineages of Bartonella had been linked to enhanced host adaptability enabled by lineage-specific acquisition of a VirB/D4 type IV secretion system (T4SS) and parallel evolution of complex effector repertoires. However, the limited availability of genome sequences from one of those lineages as well as other, remote branches of Bartonella has so far hampered comprehensive understanding of how the VirB/D4 T4SS and its effectors called Beps have shaped Bartonella evolution. Here, we report the discovery of a third repertoire of Beps associated with the VirB/D4 T4SS of B. ancashensis, a novel human pathogen that lacks any signs of host adaptability and is only distantly related to the two species-rich lineages encoding a VirB/D4 T4SS. Furthermore, sequencing of ten new Bartonella isolates from under-sampled lineages enabled combined in silico analyses and wet lab experiments that suggest several parallel layers of functional diversification during evolution of the three Bep repertoires from a single ancestral effector. Our analyses show that the Beps of B. ancashensis share many features with the two other repertoires, but may represent a more ancestral state that has not yet unleashed the adaptive potential of such an effector set. We anticipate that the effectors of B. ancashensis will enable future studies to dissect the evolutionary history of Bartonella effectors and help unraveling the evolutionary forces underlying bacterial host adaptation.

Mots-clé
AMPylation, bacterial effector, filamentation induced by cAMP, parallel evolution
Pubmed
Web of science
Open Access
Oui
Création de la notice
04/04/2017 19:14
Dernière modification de la notice
08/05/2019 16:29
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