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doi:10.1534/genetics.106.068486
A more recent version of this article appeared on October 1, 2007.
REGULAR RESEARCH PAPERS |
Male development time influences the strength of Wolbachia-induced cytoplasmic incompatibility expression in Drosophila melanogaster
Ryuichi Yamada 1, Kevin D Floate 2, Markus Riegler 1 and Scott L O'Neill 1*
1 The University of Queensland
2 Lethbridge Research Center
* To whom correspondence should be addressed. E-mail: scott.oneill{at}uq.edu.au.
Submitted on November 17, 2006
Revised on December 4, 2006
Accepted on 4 July 2007
Cytoplasmic incompatibility (CI) is the most widespread reproductive modification induced in insects by the maternally inherited intracellular bacteria Wolbachia. Expression of CI in Drosophila melanogaster is quite variable. Published papers typically show that CI expression is weak and often varies between different Drosophila lines and different labs reporting the results. The basis for this variability is not well understood, but is often considered to be due to unspecified host genotype interactions with Wolbachia. Here we show that male development time can greatly influence CI expression in D. melanogaster. In a given family, males that develop fastest express very strong CI. The "younger brothers" of these males (males that take longer to undergo larval development) quickly lose their ability to express the CI phenotype as a function of development time. This effect is independent of male age effects and is enhanced when flies are reared under crowded conditions. No correlation is seen between this effect and Wolbachia densities in testes, suggesting that a more subtle interaction between host and symbiont is responsible. The observed younger brother effect may explain much of the reported variability in CI expression in this species. When male development time is controlled it is possible to obtain consistent high levels of CI expression, which will benefit future studies that wish to use D. melanogaster as a model host to unravel CI mechanisms.
Key Words: Cytoplasmic Incompatibility, Drosophila melanogaster, Wolbachia, development time
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