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Originally published as Genetics Published Articles Ahead of Print on July 29, 2007.
Genetics, Vol. 177, 801-808, October 2007, Copyright © 2007
doi:10.1534/genetics.106.068486
Male Development Time Influences the Strength of Wolbachia-Induced Cytoplasmic Incompatibility Expression in Drosophila melanogaster
Ryuichi Yamada*,
Kevin D. Floate
,
Markus Riegler* and
Scott L. O'Neill*,1
* School of Integrative Biology, The University of Queensland, Brisbane 4072 Australia and Lethbridge Research Center, Agriculture and Agri-Food Canada, Lethbridge, Alberta T1J 4B1, Canada
1 Corresponding author: School of Integrative Biology, The University of Queensland, St. Lucia, QLD 4072, Brisbane, Australia.
E-mail: scott.oneill{at}uq.edu.au
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 consistently high levels of CI expression, which will benefit future studies that wish to use D. melanogaster as a model host to unravel CI mechanisms.
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