NDLI: Male-limited evolution suggests no extant intralocus sexual conflict over the sexually dimorphic cuticular hydrocarbons of Drosophila melanogaster

Content Provider	Springer Nature Link
Author	BEDHOMME, STÉPHANIE CHIPPINDALE, ADAM K. PRASAD, N. G. DELCOURT, MATTHIEU ABBOTT, JESSICA K. MALLET, MARTIN A. RUNDLE, HOWARD D.
Copyright Year	2011
Abstract	Sexually dimorphic traits are likely to have evolved through sexually antagonistic selection. However, recent empirical data suggest that intralocus sexual conflict often persists, even when traits have diverged between males and females. This implies that evolved dimorphism is often incomplete in resolving intralocus conflict, providing a mechanism for the maintenance of genetic variance in fitness-related traits. We used experimental evolution in Drosophila melanogaster to directly test for ongoing conflict over a suite of sexually dimorphic cuticular hydrocarbons (CHCs) that are likely targets of sex-specific selection. Using a set of experimental populations in which the transmission of genetic material had been restricted to males for 82 generations, we show that CHCs did not evolve, providing experimental evidence for the absence of current intralocus sexual conflict over these traits. The absence of ongoing conflict could indicate that CHCs have never been the target of sexually antagonistic selection, although this would require the existing dimorphism to have evolved via completely sex-linked mutations or as a result of former, but now absent, pleiotropic effects of the underlying loci on another trait under sexually antagonistic selection. An alternative interpretation, and which we believe to be more likely, is that the extensive CHC sexual dimorphism is the result of past intralocus sexual conflict that has been fully resolved, implying that these traits have evolved genetic independence between the sexes and that genetic variation in them is therefore maintained by alternative mechanisms. This latter interpretation is consistent with the known roles of CHCs in sexual communication in this species and with previous studies suggesting the genetic independence of CHCs between males and females. Nevertheless, direct estimates of sexually antagonistic selection will be important to fully resolve these alternatives.
Starting Page	443
Ending Page	452
Page Count	10
File Format	PDF
ISSN	00221333
Journal	Journal of Genetics
Volume Number	90
Issue Number	3
e-ISSN	09737731
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-12-13
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cuticular hydrocarbons experimental evolution intralocus sexual conflict male-limited evolution sexual dimorphism Drosophila melanogaster Evolutionary Biology Microbial Genetics and Genomics Life Sciences Plant Genetics & Genomics Animal Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics

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