Effect of parasitic sex-ratio distorters on host gene frequencies in a mainland-island context

Kobayashi, Yutaka; Achaz, Guillaume; Telschow, Arndt

doi:10.1111/j.1420-9101.2011.02296.x

Cited by 4 publications

(16 citation statements)

References 52 publications

(91 reference statements)

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“…Simple Mantel tests showed a significant correlation between microsatellite structure and geographic distance ( r ² = 0.308) compatible with an isolation by distance. Kobayashi et al. (2011) showed that the effects of Wolbachia on genetic drift and genetic influx cancel each other and thus remain criptic.…”

Section: Resultsmentioning

confidence: 99%

“…The effects of Wolbachia on nuclear genetic structure are expected to increase in both genetic drift and genetic influx in infected populations. However, these effects are also expected to cancel each other (Kobayashi et al. , 2011), and as a consequence, they are not easy to test.…”

Section: Discussionmentioning

confidence: 99%

“…Genetic diversity can be influenced by several factors; among them, selection pressure should not affect microsatellites diversity and Wolbachia is thought to have only criptic effects on microsatellite allelic frequencies (Kobayashi et al. , 2011), whereas drastic reductions in population size should affect both mitochondrial and nuclear genetic diversities.…”

Section: Methodsmentioning

confidence: 99%

“…, 2002, 2006; Engelstädter et al. , 2008; Kobayashi & Telschow, 2010; Kobayashi et al. , 2011), although experimental validations are still missing.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, feminizing Wolbachia are though to reduce the effective population size (and thus to increase genetic drift) and increase genetic influx in infected populations. Both effects cancel each other at neutral loci, and Wolbachia infection is thought to have only criptic effects on neutral allelic frequencies (Kobayashi et al. , 2011).…”

Section: Introductionmentioning

confidence: 99%

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Effects of parasitic sex‐ratio distorters on host genetic structure in the Armadillidium vulgare–Wolbachia association

Verne¹,

Johnson²,

Bouchon³

et al. 2011

J of Evolutionary Biology

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In the pill bug Armadillidium vulgare (Crustacea, Oniscidea), Wolbachia facilitates its spread through vertical transmission via the eggs by inducing feminization of genetic males. The spread of feminizing Wolbachia within and across populations is therefore expected to influence mitochondrial DNA (mtDNA) genetic structure by hitchhiking. To test this hypothesis, we analysed nuclear and mtDNA genetic structure, and Wolbachia prevalence in 13 populations of the pill bug host. Wolbachia prevalence (ranging from 0% to 100% of sampled females) was highly variable among populations. All three Wolbachia strains previously observed in A. vulgare were present (wVulC, wVulM and wVulP) with wVulC being the most prevalent (nine of 13 populations). The host showed a genetic structure on five microsatellite loci that is compatible with isolation by distance. The strong genetic structure observed on host mtDNA was correlated with Wolbachia prevalence: three mitotypes were in strong linkage disequilibrium with the three strains of Wolbachia. Neutrality tests showed that the mtDNA polymorphism is not neutral, and we thus suggest that this unusual pattern of mtDNA polymorphism found in A. vulgare was due to Wolbachia.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…, 2002, 2006; Engelstädter et al. , 2008; Kobayashi & Telschow, 2010; Kobayashi et al. , 2011), although experimental validations are still missing.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of parasitic sex‐ratio distorters on host genetic structure in the Armadillidium vulgare–Wolbachia association

Verne¹,

Johnson²,

Bouchon³

et al. 2011

J of Evolutionary Biology

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A neo-W chromosome in a tropical butterfly links colour pattern, male-killing, and speciation

et al. 2016

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Sexually antagonistic selection can drive both the evolution of sex chromosomes and speciation itself. The tropical butterfly the African Queen, Danaus chrysippus, shows two such sexually antagonistic phenotypes, the first being sex-linked colour pattern, the second, susceptibility to a male-killing, maternally inherited mollicute, Spiroplasma ixodeti, which causes approximately 100% mortality in male eggs and first instar larvae. Importantly, this mortality is not affected by the infection status of the male parent and the horizontal transmission of Spiroplasma is unknown. In East Africa, male-killing of the Queen is prevalent in a narrow hybrid zone centred on Nairobi. This hybrid zone separates otherwise allopatric subspecies with different colour patterns. Here we show that a neo-W chromosome, a fusion between the W (female) chromosome and an autosome that controls both colour pattern and male-killing, links the two phenotypes thereby driving speciation across the hybrid zone. Studies of the population genetics of the neo-W around Nairobi show that the interaction between colour pattern and male-killer susceptibility restricts gene flow between two subspecies of D. chrysippus. Our results demonstrate how a complex interplay between sex, colour pattern, male-killing, and a neo-W chromosome, has set up a genetic ‘sink' that keeps the two subspecies apart. The association between the neo-W and male-killing thus provides a ‘smoking gun' for an ongoing speciation process.

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The infection dynamics of vertically transmitted viruses in a two-population model

Strauß

Chauvet

Telschow

2018

Preprint

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There is a growing interest in vertically transmitted viruses. Field studies show that 15 virus infection frequency often varies in space and time. In order to understand the 16 spatial variation of virus prevalence, we designed a mathematical model describing 17 the infection dynamics of a biparentally inherited virus in a two-population model. 18Model parameters are paternal and maternal transmission rates, cost of infection, 19 and up to two migration rates. We investigated three different population structures: 20(1) a single panmictic host population, (2) two populations connected by unidirec-21 tional migration (mainland-island model), and (3) two populations connected by 22 two-way migration. According to the results, the parameter space can be divided in 23 three zones: (1) viral spread, (2) no viral spread, (3) bistability (in a single popula-24 tion) or stable infection polymorphism (in the two-population models). The finding 25 of bistability is interesting and new. It shows that infected and uninfected popu-26 lations can stably coexist, if migration is below a critical value, and if the cost of 27 infection is moderately high. In summary, our results show that spatial structure of 28 host populations is an important factor in determining geographical differences of 29 vertically transmitted viruses.30 31

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Effect of parasitic sex-ratio distorters on host gene frequencies in a mainland-island context

Cited by 4 publications

References 52 publications

Effects of parasitic sex‐ratio distorters on host genetic structure in the Armadillidium vulgare–Wolbachia association

Effects of parasitic sex‐ratio distorters on host genetic structure in the Armadillidium vulgare–Wolbachia association

A neo-W chromosome in a tropical butterfly links colour pattern, male-killing, and speciation

The infection dynamics of vertically transmitted viruses in a two-population model

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