Affiliation:
1. Center for Reproductive Evolution, Department of Biology, Syracuse University, Syracuse, NY 13244, USA
Abstract
Fertility depends, in part, on interactions between male and female reproductive proteins inside the female reproductive tract (FRT) that mediate postmating changes in female behaviour, morphology, and physiology. Coevolution between interacting proteins within species may drive reproductive incompatibilities between species, yet the mechanisms underlying postmating–prezygotic (PMPZ) isolating barriers remain poorly resolved. Here, we used quantitative proteomics in sibling
Drosophila
species to investigate the molecular composition of the FRT environment and its role in mediating species-specific postmating responses. We found that (i) FRT proteomes in
D. simulans
and
D. mauritiana
virgin females express unique combinations of secreted proteins and are enriched for distinct functional categories, (ii) mating induces substantial changes to the FRT proteome in
D. mauritiana
but not in
D. simulans
, and (iii) the
D. simulans
FRT proteome exhibits limited postmating changes irrespective of whether females mate with conspecific or heterospecific males, suggesting an active female role in mediating reproductive interactions. Comparisons with similar data in the closely related outgroup species
D. melanogaster
suggest that divergence is concentrated on the
D. simulans
lineage. Our study suggests that divergence in the FRT extracellular environment and postmating response contribute to previously described patterns of PMPZ isolation and the maintenance of species boundaries.
Funder
Division of Environmental Biology
National Institute of Child Health and Human Development
Subject
General Agricultural and Biological Sciences,General Environmental Science,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine
Cited by
15 articles.
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