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자연과학대학
생명과학전공
Journal papers
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Divergent paths in the evolutionary history of maternally transmitted clam symbionts
Title
Divergent paths in the evolutionary history of maternally transmitted clam symbionts
Authors
Perez M.
;
Breusing C.
;
Angers B.
;
Beinart R.A.
;
Won Y.-J.
;
Young C.R.
Ewha Authors
원용진
SCOPUS Author ID
원용진
Issue Date
2022
Journal Title
Proceedings of the Royal Society B: Biological Sciences
ISSN
0962-8452
Citation
Proceedings of the Royal Society B: Biological Sciences vol. 289, no. 1970
Keywords
deep-sea
;
niche partitioning
;
reductive genome evolution
;
selection
;
symbiosis
Publisher
Royal Society Publishing
Indexed
SCIE; SCOPUS
Document Type
Article
Abstract
Vertical transmission of bacterial endosymbionts is accompanied by virtually irreversible gene loss that results in a progressive reduction in genome size. While the evolutionary processes of genome reduction have been well described in some terrestrial symbioses, they are less understood inmarine systems where vertical transmission is rarely observed. The association between deep-sea vesicomyid clams and chemosynthetic Gammaproteobacteria is one example of maternally inherited symbioses in the ocean. Here, we assessed the contributions of drift, recombination and selection to genome evolution in two extant vesicomyid symbiont clades by comparing 15 representative symbiont genomes (1.017-1.586 Mb) to those of closely related bacteria and the hosts' mitochondria. Our analyses suggest that drift is a significant force driving genome evolution in vesicomyid symbionts, though selection and interspecific recombination appear to be critical formaintaining symbiont functional integrity and creating divergent patterns of gene conservation. Notably, the two symbiont clades possess putative functional differences in sulfide physiology, anaerobic respiration and dependency on environmental vitamin B12, which probably reflect adaptations to different ecological habitats available to each symbiont group. Overall, these results contribute to our understanding of the eco-evolutionary processes shaping reductive genome evolution in vertically transmitted symbioses. © 2022 The Author(s) Published by the Royal Society. All rights reserved.
DOI
10.1098/rspb.2021.2137
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