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Two host clades, two bacterial arsenals: evolution through gene losses in facultative endosymbionts
Year:
2015
Source of publication :
Genome Biology and Evolution
Authors :
Zchori-Fein, Einat
;
.
Volume :
7
Co-Authors:

Pierre-Antoine Rollat-Farnier, 
Diego Santos-Garcia, 
Qiong Rao, 
Marie-France Sagot, 
Francisco J. Silva, 
Hélène Henri, 
Einat Zchori-Fein, 
Amparo Latorre, 
Andrés Moya, 
Valérie Barbe, 
Shu-Sheng Liu, 
Xiao-Wei Wang, 
Fabrice Vavre, 
Laurence Mouton

Facilitators :
From page:
839
To page:
855
(
Total pages:
17
)
Abstract:

Bacterial endosymbiosis is an important evolutionary process in insects, which can harbor both obligate and facultative symbionts. The evolution of these symbionts is driven by evolutionary convergence, and they exhibit among the tiniest genomes in prokaryotes. The large host spectrum of facultative symbionts and the high diversity of strategies they use to infect new hosts probably impact the evolution of their genome and explain why they undergo less severe genomic erosion than obligate symbionts. Candidatus Hamiltonella defensa is suitable for the investigation of the genomic evolution of facultative symbionts because the bacteria are engaged in specific relationships in two clades of insects. In aphids, H. defensa is found in several species with an intermediate prevalence and confers protection against parasitoids. In whiteflies, H. defensa is almost fixed in some species of Bemisia tabaci, which suggests an important role of and a transition toward obligate symbiosis. In this study, comparisons of the genome of H. defensa present in two B. tabaci species (Middle East Asia Minor 1 and Mediterranean) and in the aphid Acyrthosiphon pisum revealed that they belong to two distinct clades and underwent specific gene losses. In aphids, it contains highly virulent factors that could allow protection and horizontal transfers. In whiteflies, the genome lost these factors and seems to have a limited ability to acquire genes. However it contains genes that could be involved in the production of essential nutrients, which is consistent with a primordial role for this symbiont. In conclusion, although both lineages of H. defensa have mutualistic interactions with their hosts, their genomes follow distinct evolutionary trajectories that reflect their phenotype and could have important consequences on their evolvability.

Note:
Related Files :
Aphids
Bemisia tabaci
Comparative genomics
Hamiltonella defensa
Show More
Related Content
More details
DOI :
10.1093/gbe/evv030
Article number:
0
Affiliations:
Database:
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
53506
Last updated date:
02/03/2022 17:27
Creation date:
15/02/2021 18:36
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Scientific Publication
Two host clades, two bacterial arsenals: evolution through gene losses in facultative endosymbionts
7

Pierre-Antoine Rollat-Farnier, 
Diego Santos-Garcia, 
Qiong Rao, 
Marie-France Sagot, 
Francisco J. Silva, 
Hélène Henri, 
Einat Zchori-Fein, 
Amparo Latorre, 
Andrés Moya, 
Valérie Barbe, 
Shu-Sheng Liu, 
Xiao-Wei Wang, 
Fabrice Vavre, 
Laurence Mouton

Two host clades, two bacterial arsenals: evolution through gene losses in facultative endosymbionts

Bacterial endosymbiosis is an important evolutionary process in insects, which can harbor both obligate and facultative symbionts. The evolution of these symbionts is driven by evolutionary convergence, and they exhibit among the tiniest genomes in prokaryotes. The large host spectrum of facultative symbionts and the high diversity of strategies they use to infect new hosts probably impact the evolution of their genome and explain why they undergo less severe genomic erosion than obligate symbionts. Candidatus Hamiltonella defensa is suitable for the investigation of the genomic evolution of facultative symbionts because the bacteria are engaged in specific relationships in two clades of insects. In aphids, H. defensa is found in several species with an intermediate prevalence and confers protection against parasitoids. In whiteflies, H. defensa is almost fixed in some species of Bemisia tabaci, which suggests an important role of and a transition toward obligate symbiosis. In this study, comparisons of the genome of H. defensa present in two B. tabaci species (Middle East Asia Minor 1 and Mediterranean) and in the aphid Acyrthosiphon pisum revealed that they belong to two distinct clades and underwent specific gene losses. In aphids, it contains highly virulent factors that could allow protection and horizontal transfers. In whiteflies, the genome lost these factors and seems to have a limited ability to acquire genes. However it contains genes that could be involved in the production of essential nutrients, which is consistent with a primordial role for this symbiont. In conclusion, although both lineages of H. defensa have mutualistic interactions with their hosts, their genomes follow distinct evolutionary trajectories that reflect their phenotype and could have important consequences on their evolvability.

Scientific Publication
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