Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams
Autor: | Curtis R. Young, Robert C. Vrijenhoek, Corinna Breusing, Shannon B. Johnson |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
0106 biological sciences
0301 basic medicine Genetic Markers animal structures Biology 010603 evolutionary biology 01 natural sciences Polymorphism Single Nucleotide Host Specificity Evolution Molecular 03 medical and health sciences Symbiosis RNA Ribosomal 16S Genetics vesicomyid clams Animals 14. Life underwater horizontal transfer hybridization Ecology Evolution Behavior and Systematics Phylogeny Chemosynthesis Phylotype Genome Pacific Ocean Bacteria Host (biology) fungi Interspecific competition Sequence Analysis DNA biochemical phenomena metabolism and nutrition 16S ribosomal RNA From the Cover symbiosis Bivalvia 030104 developmental biology Genetic marker Evolutionary biology Horizontal gene transfer Hybridization Genetic vertical transmission |
Zdroj: | Molecular Ecology |
ISSN: | 1365-294X 0962-1083 |
Popis: | 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. https://doi.org/10.1111/mec.15262 |
Databáze: | OpenAIRE |
Externí odkaz: |