期刊
ISME JOURNAL
卷 16, 期 1, 页码 247-256出版社
SPRINGERNATURE
DOI: 10.1038/s41396-021-01056-z
关键词
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资金
- Austrian Science Fund (FWF) [P22533-B17]
- Austrian Science Fund project [DOC 69-B]
- Marie Skodowska-Curie Individual Fellowship of the European Union [840270]
- Austrian Science Fund (FWF) [P22533] Funding Source: Austrian Science Fund (FWF)
- Marie Curie Actions (MSCA) [840270] Funding Source: Marie Curie Actions (MSCA)
Adelgids harbor diverse symbionts, with Vallotia and Profftia being complementary young endosymbionts that originated from Rhizopus fungi. The transition from fungus to insect endosymbionts resulted in loss of various functions, expanding our understanding of evolutionary trajectories of host-associated microbes.
Adelgids (Insecta: Hemiptera: Adelgidae) form a small group of insects but harbor a surprisingly diverse set of bacteriocyte-associated endosymbionts, which suggest multiple replacement and acquisition of symbionts over evolutionary time. Specific pairs of symbionts have been associated with adelgid lineages specialized on different secondary host conifers. Using a metagenomic approach, we investigated the symbiosis of the Adelges laricis/Adelgestardus species complex containing betaproteobacterial (Candidatus Vallotia tarda) and gammaproteobacterial (Candidatus Profftia tarda) symbionts. Genomic characteristics and metabolic pathway reconstructions revealed that Vallotia and Profftia are evolutionary young endosymbionts, which complement each other's role in essential amino acid production. Phylogenomic analyses and a high level of genomic synteny indicate an origin of the betaproteobacterial symbiont from endosymbionts of Rhizopus fungi. This evolutionary transition was accompanied with substantial loss of functions related to transcription regulation, secondary metabolite production, bacterial defense mechanisms, host infection, and manipulation. The transition from fungus to insect endosymbionts extends our current framework about evolutionary trajectories of host-associated microbes.
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