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Mating Changes Sexually Dimorphic Gene Expression in the Seed Beetle Callosobruchus maculatus
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.ORCID iD: 0000-0002-3501-3376
2017 (English)In: Genome Biology and Evolution, ISSN 1759-6653, E-ISSN 1759-6653, Vol. 9, no 3, 677-699 p.Article in journal (Refereed) Published
Abstract [en]

Sexually dimorphic phenotypes arise largely from sex-specific gene expression, which hasmainly been characterized in sexually naive adults. However, we expect sexual dimorphism in transcription to be dynamic and dependent on factors such as reproductive status. Mating induces many behavioral and physiological changes distinct to each sex and is therefore expected to activate regulatory changes in many sex-biased genes. Here, we first characterized sexual dimorphism in gene expression in Callosobruchus maculatus seed beetles. We then examined how females and males respond to mating and how it affects sex-biased expression, both in sex-limited (abdomen) and sex-shared (head and thorax) tissues. Mating responses were largely sex-specific and, as expected, females showed more genes responding compared with males (similar to 2,000 vs. similar to 300 genes in the abdomen, similar to 500 vs. similar to 400 in the head and thorax, respectively). Of the sex-biased genes present in virgins, 16%(1,041 genes) in the abdomen and 17%(243 genes) in the head and thorax altered their relative expression between the sexes as a result of mating. Sex-bias status changed in 2% of the genes in the abdomen and 4% in the head and thorax following mating. Mating responses involved de-feminization of females and, to a lesser extent, de-masculinization of males relative to their virgin state: mating decreased rather than increased dimorphic expression of sex-biased genes. The fact that regulatory changes of both types of sex-biased genes occurred in both sexes suggests that male-and female-specific selection is not restricted to male-and female-biased genes, respectively, as is sometimes assumed.

Place, publisher, year, edition, pages
2017. Vol. 9, no 3, 677-699 p.
Keyword [en]
RNA-Seq, transcriptome, sex-biased expression, sex-specific selection, alternative splicing
National Category
Genetics Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-326371DOI: 10.1093/gbe/evx029ISI: 000402095700022PubMedID: 28391318OAI: oai:DiVA.org:uu-326371DiVA: diva2:1120817
Funder
EU, European Research Council, AdG-294333Swedish Research Council, 621-2010-5266
Available from: 2017-07-07 Created: 2017-07-07 Last updated: 2017-07-07Bibliographically approved

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