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Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams

Deep‐sea vesicomyid clams live in mutualistic symbiosis with chemosynthetic bacteria that are inherited through the maternal germ line. On evolutionary timescales, strictly vertical transmission should lead to cospeciation of host mitochondrial and symbiont lineages; nonetheless, examples of incongr...

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Autores principales: Breusing, Corinna, Johnson, Shannon B., Vrijenhoek, Robert C., Young, Curtis R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7004080/
https://www.ncbi.nlm.nih.gov/pubmed/31478269
http://dx.doi.org/10.1111/mec.15224
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author Breusing, Corinna
Johnson, Shannon B.
Vrijenhoek, Robert C.
Young, Curtis R.
author_facet Breusing, Corinna
Johnson, Shannon B.
Vrijenhoek, Robert C.
Young, Curtis R.
author_sort Breusing, Corinna
collection PubMed
description Deep‐sea vesicomyid clams live in mutualistic symbiosis with chemosynthetic bacteria that are inherited through the maternal germ line. On evolutionary timescales, strictly vertical transmission should lead to cospeciation of host mitochondrial and symbiont lineages; nonetheless, examples of incongruent phylogenies have been reported, suggesting that symbionts are occasionally horizontally transmitted between host species. The current paradigm for vesicomyid clams holds that direct transfers cause host shifts or mixtures of symbionts. An alternative hypothesis suggests that hybridization between host species might explain symbiont transfers. Two clam species, Archivesica gigas and Phreagena soyoae, frequently co‐occur at deep‐sea hydrocarbon seeps in the eastern Pacific Ocean. Although the two species typically host gammaproteobacterial symbiont lineages marked by divergent 16S rRNA phylotypes, we identified a number of clams with the A. gigas mitotype that hosted symbionts with the P. soyoae phylotype. Demographic inference models based on genome‐wide SNP data and three Sanger sequenced gene markers provided evidence that A. gigas and P. soyoae hybridized in the past, supporting the hypothesis that hybridization might be a viable mechanism of interspecific symbiont transfer. These findings provide new perspectives on the evolution of vertically transmitted symbionts and their hosts in deep‐sea chemosynthetic environments.
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spelling pubmed-70040802020-02-11 Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams Breusing, Corinna Johnson, Shannon B. Vrijenhoek, Robert C. Young, Curtis R. Mol Ecol From the Cover Deep‐sea vesicomyid clams live in mutualistic symbiosis with chemosynthetic bacteria that are inherited through the maternal germ line. On evolutionary timescales, strictly vertical transmission should lead to cospeciation of host mitochondrial and symbiont lineages; nonetheless, examples of incongruent phylogenies have been reported, suggesting that symbionts are occasionally horizontally transmitted between host species. The current paradigm for vesicomyid clams holds that direct transfers cause host shifts or mixtures of symbionts. An alternative hypothesis suggests that hybridization between host species might explain symbiont transfers. Two clam species, Archivesica gigas and Phreagena soyoae, frequently co‐occur at deep‐sea hydrocarbon seeps in the eastern Pacific Ocean. Although the two species typically host gammaproteobacterial symbiont lineages marked by divergent 16S rRNA phylotypes, we identified a number of clams with the A. gigas mitotype that hosted symbionts with the P. soyoae phylotype. Demographic inference models based on genome‐wide SNP data and three Sanger sequenced gene markers provided evidence that A. gigas and P. soyoae hybridized in the past, supporting the hypothesis that hybridization might be a viable mechanism of interspecific symbiont transfer. These findings provide new perspectives on the evolution of vertically transmitted symbionts and their hosts in deep‐sea chemosynthetic environments. John Wiley and Sons Inc. 2019-09-23 2019-11 /pmc/articles/PMC7004080/ /pubmed/31478269 http://dx.doi.org/10.1111/mec.15224 Text en © 2019 The Authors. Molecular Ecology published by John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle From the Cover
Breusing, Corinna
Johnson, Shannon B.
Vrijenhoek, Robert C.
Young, Curtis R.
Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams
title Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams
title_full Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams
title_fullStr Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams
title_full_unstemmed Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams
title_short Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams
title_sort host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams
topic From the Cover
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7004080/
https://www.ncbi.nlm.nih.gov/pubmed/31478269
http://dx.doi.org/10.1111/mec.15224
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