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YOU CAN'T KEEP A GOOD PARASITE DOWN: EVOLUTION OF A MALE‐KILLER SUPPRESSOR UNCOVERS CYTOPLASMIC INCOMPATIBILITY

Identifieur interne : 001338 ( Istex/Curation ); précédent : 001337; suivant : 001339

YOU CAN'T KEEP A GOOD PARASITE DOWN: EVOLUTION OF A MALE‐KILLER SUPPRESSOR UNCOVERS CYTOPLASMIC INCOMPATIBILITY

Auteurs : Emily A. Hornett [Royaume-Uni] ; Anne M. R. Duplouy [Australie] ; Neil Davies [Polynésie française, États-Unis] ; George K. Roderick [Polynésie française, États-Unis] ; Nina Wedell [Royaume-Uni] ; Gregory D. D. Hurst [Royaume-Uni] ; Sylvain Charlat [France]

Source :

RBID : ISTEX:6752EAEAD71AF860500E9D3C2164D3DD72A54FEE

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English descriptors

Abstract

Maternally inherited parasites are known to impose a wide variety of reproductive manipulations upon their host. These often produce strong selection on the host to suppress the parasite, resulting in a reduction in the frequency of the parasite. However, in the butterfly Hypolimnas bolina, infected with a Wolbachia bacterium, field data demonstrate that suppression of the male‐killing phenotype does not depress parasite frequency. Here we test and verify one hypothesis to explain this apparent paradox—Wolbachia induces a second phenotype, Cytoplasmic Incompatibility (CI), in populations where host suppression has evolved. We further demonstrate that the capacity to induce CI has not evolved de novo, but instead is instantaneously expressed upon the survival of infected males. The significance of these results is threefold: (1) multiple phenotypes can provide Wolbachia with the means to maintain itself in a host following suppression of a single manipulative phenotype; (2) the ability to induce CI can remain hidden in systems in which male‐killing is observed, just as the ability to induce male‐killing may be obscured in strains exhibiting CI; (3) the evolutionary maintenance of CI in a system in which it is not expressed suggests a functional link with male‐killing or other traits under selection.

Url:
DOI: 10.1111/j.1558-5646.2008.00353.x

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ISTEX:6752EAEAD71AF860500E9D3C2164D3DD72A54FEE

Le document en format XML

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<div type="abstract" xml:lang="en">Maternally inherited parasites are known to impose a wide variety of reproductive manipulations upon their host. These often produce strong selection on the host to suppress the parasite, resulting in a reduction in the frequency of the parasite. However, in the butterfly Hypolimnas bolina, infected with a Wolbachia bacterium, field data demonstrate that suppression of the male‐killing phenotype does not depress parasite frequency. Here we test and verify one hypothesis to explain this apparent paradox—Wolbachia induces a second phenotype, Cytoplasmic Incompatibility (CI), in populations where host suppression has evolved. We further demonstrate that the capacity to induce CI has not evolved de novo, but instead is instantaneously expressed upon the survival of infected males. The significance of these results is threefold: (1) multiple phenotypes can provide Wolbachia with the means to maintain itself in a host following suppression of a single manipulative phenotype; (2) the ability to induce CI can remain hidden in systems in which male‐killing is observed, just as the ability to induce male‐killing may be obscured in strains exhibiting CI; (3) the evolutionary maintenance of CI in a system in which it is not expressed suggests a functional link with male‐killing or other traits under selection.</div>
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