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Searching for candidate speciation genes using a proteomic approach: seminal proteins in

Summary: Searching for candidate speciation genes using
a proteomic approach: seminal proteins in
field crickets
Jose A. Andre´s*, Luana S. Maroja and Richard G. Harrison
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA
In many animals, male seminal proteins influence gamete interactions and fertilization ability and are
probably involved in barriers to gene flow between diverging lineages. Here we use a proteomic approach to
identify seminal proteins that are transferred to females during copulation and that may be involved in
fertilization barriers between two hybridizing field crickets (Gryllus firmus and Gryllus pennsylvanicus).
Analyses of patterns of divergence suggest that much of the field cricket genome has remained
undifferentiated following the evolution of reproductive isolation. By contrast, seminal protein genes are
highly differentiated. Tests of selection reveal that positive selection is likely to be responsible for patterns of
differentiation. Together, our observations suggest that some of the loci encoding seminal proteins may
indeed play a role in fertilization barriers in field crickets.
Keywords: reproductive isolation; fertilization barriers; gene genealogies; selection; Gryllus
Identifying genetic changes that contribute to reproductive
isolation is one of the central problems in evolutionary
biology. Although almost all of the genes of an organism
potentially can contribute to intraspecific variation and


Source: Andrés, José - Department of Biology, University of Saskatchewan


Collections: Biology and Medicine