Does polyandry control population sex ratio via regulation of a selfish gene?

Price, Tom A. R.; Bretman, Amanda; Gradilla, Ana Citlali; Reger, Julia; Taylor, Michelle L.; Giraldo-Perez, Paulina; Campbell, Amy E.; Hurst, Gregory D. D.; Wedell, Nina

doi:10.1098/rspb.2013.3259

Cited by 45 publications

(83 citation statements)

References 69 publications

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“…Previous work has found significant genetic variation in remating propensity in females from different populations (Price et al. 2014) and from different families (Price et al. 2011).…”

Section: Introductionmentioning

confidence: 99%

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Can patterns of chromosome inversions in Drosophila pseudoobscura predict polyandry across a geographical cline?

Herrera

Taylor

Skeats

et al. 2014

Ecology and Evolution

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Female multiple mating, known as polyandry, is ubiquitous and occurs in a wide variety of taxa. Polyandry varies greatly from species in which females mate with one or two males in their lifetime to species in which females may mate with several different males on the same day. As multiple mating by females is associated with costs, numerous hypotheses attempt to explain this phenomenon. One hypothesis not extensively explored is the possibility that polyandrous behavior is captured and “fixed” in populations via genetic processes that preserve the behavior independently of any adaptive benefit of polyandry. Here, we use female isolines derived from populations of Drosophila pseudoobscura from three locations in North America to examine whether different female remating levels are associated with patterns of chromosome inversions, which may explain patterns of polyandry across the geographic range. Populations differed with respect to the frequency of polyandry and the presence of inversion polymorphisms on the third chromosome. The population with the lowest level of female remating was the only one that was entirely comprised of homokaryotypic lines, but the small number of populations prevented us investigating this relationship further at a population level. However, we found no strong relationship between female remating levels and specific karyotypes of the various isolines.

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“…Previous work has found significant genetic variation in remating propensity in females from different populations (Price et al. 2014) and from different families (Price et al. 2011).…”

Section: Introductionmentioning

confidence: 99%

“…There is also evidence for a latitudinal cline in polyandry across North America that may help to regulate the spread of a sex ratio distorting selfish genetic element ( SR ) (Price et al. 2014). D. pseudoobscura have four pairs of chromosomes in addition to the sex chromosomes (Tan 1935).…”

Section: Introductionmentioning

confidence: 99%

Can patterns of chromosome inversions in Drosophila pseudoobscura predict polyandry across a geographical cline?

Herrera

Taylor

Skeats

et al. 2014

Ecology and Evolution

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“…Even the absence of parallel differentiation contributes to our understanding of the repeatability of adaptive differentiation and the different mechanisms and constraints that influence both phenotypic and molecular evolution. While there has been a great focus on geographic variation in D. melanogaster, investigations of other Drosophila have demonstrated the presence of geographic patterns in a number of other species in the genus (e.g., Sturtevant and Dobzhansky 1936;Dobzhansky 1948Dobzhansky , 1947Huey 2000;Hallas et al 2002;Arthur et al 2008;Tyukmaeva et al 2011;Price et al 2014), revealing cross-species convergence in clines for traits such as wing size and cold tolerance. Among these species, Drosophila simulans presents an especially attractive system for further study of geographic genetic variation because of recent divergence (5 million years ago, Tamura et al 2004) from the well-studied D. melanogaster.…”

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confidence: 99%

Genomic Patterns of Geographic Differentiation in Drosophila simulans

2016

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Geographic patterns of genetic differentiation have long been used to understand population history and to learn about the biological mechanisms of adaptation. Here we present an examination of genomic patterns of differentiation between northern and southern populations of Australian and North American Drosophila simulans, with an emphasis on characterizing signals of parallel differentiation. We report on the genomic scale of differentiation and functional enrichment of outlier SNPs. While, overall, signals of shared differentiation are modest, we find the strongest support for parallel differentiation in genomic regions that are associated with regulation. Comparisons to Drosophila melanogaster yield potential candidate genes involved in local adaptation in both species, providing insight into common selective pressures and responses. In contrast to D. melanogaster, in D. simulans we observe patterns of variation that are inconsistent with a model of temperate adaptation out of a tropical ancestral range, highlighting potential differences in demographic and colonization histories of this cosmopolitan species pair.KEYWORDS geographic variation; population genomics; Drosophila T HE geographic distribution of genetic or phenotypic variation can provide valuable insight into the process of adaptation. For example, consistent patterns of genetic variation across space have long been interpreted as evidence for local adaptation owing to spatially varying selection (Endler 1977; Adrion et al. 2015). This is well illustrated in populations of Drosophila melanogaster, a model system showing consistent phenotypic and molecular clines across environmental gradients (Hoffmann and Weeks 2007). Among these, the association of latitude with variation in ecologically relevant traits such as heat knockdown resistance, chill coma recovery, and diapause incidence Schmidt and Paaby 2008) provides strong support for local adaptation to climate.Despite efforts to understand the potential adaptive nature of molecular variation in populations of Drosophila, there remains some disconnect between our understanding of allele-frequency clines and phenotypic clines, of which the latter are more easily and intuitively interpretable. For the vast majority of clinal molecular polymorphisms in Drosophila, the mechanisms underlying their maintenance are poorly understood. Nevertheless, because gene flow in Drosophila is thought to be high, strong differentiation often can be argued as evidence of local adaptation. Moreover, because the physical scale of linkage disequilibrium (LD) in Drosophlia is often smaller than the size of genes (Langley et al. 2012), differentiation between populations generally is associated with hypotheses regarding individual genes as targets of selection.Observation of parallel patterns of differentiation furthers the argument for an adaptive basis to differentiation, and in general, comparisons of patterns of variation across independent replicate geographic transects may contribute to an understanding of...

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“…Multiple studies have documented that female remating frequency is affected by temperature in multiple insects. For example, exposure to low temperature decreases remating frequency in D. melanogaster (Best et al, 2012), adzuki bean beetle (Callosobruchus chinensis, Katsuki and Miyatake, 2009) and cricket (Acheta domesticus, Kindle et al, 2006).Adaptation to lower temperatures increases female mating propensity in D. pseudoobscura with females from northern populations mating more frequently than females from the southern populations (Price et al, 2014). Thus, temperature can indirectly affect postcopulatory traits through female remating frequency.…”

Section: Introductionmentioning

confidence: 94%