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<title lang=en>Unexpected structured intraspecific diversity of thioautotrophic bacterial gill endosymbionts within the Lucinidae (Mollusca: Bivalvia)</title>
<creator>Brissac, Terry</creator>
<creator>Higuet, Dominique</creator>
<creator>Gros, Olivier</creator>
<creator>Mercot, Herve</creator>
<contributor>Evolution des Génomes Eucaryotes (EGE) ; Systématique, adaptation, évolution (SAE) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS) - Evolution Paris Seine ; Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Université des Antilles et de la Guyane (UAG)</contributor>
<contributor>MENRT grant (Ministere de l'Education Nationale de la Recherche et des Technologies)</contributor>
<description>International audience</description>
<source>ISSN: 0025-3162</source>
<source>EISSN: 1432-1793</source>
<source>Marine Biology</source>
<publisher>Springer Verlag</publisher>
<identifier>hal-01544753</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01544753</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01544753</source>
<source>Marine Biology, Springer Verlag, 2016, 163 (8), pp.176. 〈10.1007/s00227-016-2949-0〉</source>
<identifier>DOI : 10.1007/s00227-016-2949-0</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-016-2949-0</relation>
<language>en</language>
<subject>[SDV.BID] Life Sciences [q-bio]/Biodiversity</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>In chemoautotrophic associations, sequence comparison of 16S rRNA has been the method of choice to study bacterial diversity in the context of host/symbiont coevolution. However, the relative low rate of evolution of 16S rRNA has been shown to result in a diminished capacity to discriminate between closely related bacterial strains or species. Within chemoautotrophic associations, as described in several studies, the use of other genetic markers may reveal previously unobserved strain diversity among gill endosymbionts. Herein, we conducted a survey of symbionts harbored by six species within the Lucinidae family using five genetic markers (dnaE, gyrB, aprA, cbbL genes and the 16S-23S internal transcribed spacer). Thus, within the already described SoLuc₁ bacterial species shared by six host species we observed an obvious bacterial strain diversity. This diversity is structured in function of the geographic location of the hosts and not in function of ecological parameters or host phylogeny. Interestingly at the local level (same seagrass bed environment), we observed an unexpected specificity in host species/bacterial strain association (i.e., all individuals of the same host species harbor the same symbiotic sequence type). This specificity of association implied that there was a control of symbiont strain acquisition by the host, which was confirmed by a cross-infection experiment of starved adults performed in our study. Based upon our results and other evidence from the literature, we hypothesize that this pattern may be due to a ``capture/escape'' type antagonist evolution of the two partners.</description>
<date>2016-08</date>
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