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6 results for “Drosophila neotestacea”
Data from: Association of polyandry and sex-ratio drive prevalence in natural populations of Drosophila neotestacea
Selfish genetic elements bias their own transmission to the next generation, even at the expense of the fitness of their carrier. Sex-ratio (SR) meiotic drive occurs when an X-chromosome causes Y-bearing sperm to die during male spermatogenesis, so that it is passed on to all of the male's offspring, which are all daughters. How SR is maintained as a stable polymorphism in the absence of genetic suppressors of drive is unknown. Here, we investigate the potential for the female remating rate to affect SR dynamics in natural populations, using the fly Drosophila neotestacea. In controlled laboratory conditions, females from populations where SR is rare mate more often than females from populations where SR is common. Furthermore, only when males mate multiply does the average fertility of SR males relative to wild-type males decrease to a level that can prevent SR from spreading. Our results suggest that differences in the female mating rate among populations may contribute to SR dynamics in the wild, and thus also affect the outcome of this intragenomic conflict. In line with this, we also present evidence of a localized population crash due to SR that may have resulted from habitat fragmentation along with a reduced mating rate.
Data from: Genomic conflict drives patterns of X-linked population structure in Drosophila neotestacea
Intra-genomic conflict has the potential to cause widespread changes in patterns of genetic diversity and genome evolution. In this study, we investigate the consequences of sex-ratio (SR) drive on the population genetic patterns of the X-chromosome in Drosophila neotestacea. An SR X-chromosome prevents the maturation of Y-bearing sperm during male spermatogenesis, and thus is transmitted to ~100% of the offspring, nearly all of which are daughters. Selection on the rest of the genome to suppress sex-ratio can be strong, and the resulting conflict over the offspring sex ratio can result in the accumulation of multiple loci on the X-chromosome that are necessary for expression of drive. We surveyed variation at 12 random X-linked microsatellites across 16 populations of D. neotestacea that range in SR frequency from 0-30%. First, every locus was differentiated between SR and wild-type chromosomes, and this drives genetic structure at the X-chromosome. Once the association with sex-ratio is accounted for, the patterns of differentiation among populations are similar to the autosomes. Second, within wild-type chromosomes the relative heterozygosity is reduced in populations with an increased prevalence of drive, and the heterozygosity of SR chromosomes is higher than expected based on its prevalence. The combination of the relatively high prevalence of SR drive and the structuring of polymorphism between the SR and wild-type chromosomes suggests that genetic conflict due to SR drive has had significant consequences on the patterns of X-linked polymorphism and thus also likely affects the tempo of X-chromosome evolution in D. neotestacea.
Data from: Genomic conflict drives patterns of X-linked population structure in Drosophila neotestacea
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Data from: A fast-evolving X-linked duplicate of importin-α2 is overexpressed in sex-ratio drive in Drosophila neotestacea
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Data from: Association of polyandry and sex-ratio drive prevalence in natural populations of Drosophila neotestacea
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Data from: Local selection underlies the geographic distribution of sex-ratio drive in Drosophila neotestacea
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