Genetic Architecture of Conspecific Sperm Precedence in<i>Allonemobius fasciatus</i>and<i>A. socius</i>

Britch, Seth C.; Swartout, Emma J; Hampton, Daniel; Draney, Michael L.; Chu, Jiming; Marshall, Jeremy L.; Howard, Daniel J.

doi:10.1534/genetics.106.064949

Cited by 10 publications

(8 citation statements)

References 57 publications

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“…Because we could not detect male‐specific TRD less than ∼58:42 M. guttatus : M. nasutus by chi‐square tests (given backcross population sizes < 190), it is likely that additional loci of small effect also contribute to CPP. This polygenic genetic architecture is comparable to that seen for conspecific sperm precedence in crickets (Britch et al 2007) and fruit flies (Civetta et al 2002). It contrasts with the finding of major cross‐incompatibility loci in crosses of domesticated maize and its wild relative teosinte (Kermicle and Evans 2005; Kermicle 2006) and the major role of the self‐incompatibility (SI) locus in cross‐incompatibility in tomato hybrids (Bernacchi and Tanksley 1997).…”

Section: Discussionsupporting

confidence: 69%

TOWARD THE EVOLUTIONARY GENOMICS OF GAMETOPHYTIC DIVERGENCE: PATTERNS OF TRANSMISSION RATIO DISTORTION IN MONKEYFLOWER (MIMULUS) HYBRIDS REVEAL A COMPLEX GENETIC BASIS FOR CONSPECIFIC POLLEN PRECEDENCE

2008

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Conspecific pollen precedence (CPP) is a major component of reproductive isolation between many flowering plant taxa and may reveal mechanisms of gametophytic evolution within species, but little is known about the genetic basis and evolutionary history of CPP. We systematically investigated the genetic architecture of CPP using patterns of transmission ratio distortion (TRD) in F2 and backcross hybrids between closely related species of Mimulus (Phrymaceae) with divergent mating systems. We found that CPP in Mimulus hybrids was polygenic and was the majority source of interspecific TRD genome-wide, with at least eight genomic regions contributing to the transmission advantage of M. guttatus pollen grains on M. guttatus styles. In aggregate, these male-specific transmission ratio distorting loci (TRDLs) were more than sufficient to account for the 100% precedence of pure M. guttatus pollen over M. nasutus pollen in mixed pollinations of M. guttatus. All but one of these pollen TRDLs were styledependent; that is, we observed pollen TRD in F 1 and/or M. guttatus styles, but not in M. nasutus styles. These findings suggest that species-specific differences in pollen tube performance accumulate gradually and may have been driven by coevolution between pollen and style in the predominantly outcrossing M. guttatus.

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Section: Discussionsupporting

confidence: 69%

TOWARD THE EVOLUTIONARY GENOMICS OF GAMETOPHYTIC DIVERGENCE: PATTERNS OF TRANSMISSION RATIO DISTORTION IN MONKEYFLOWER (MIMULUS) HYBRIDS REVEAL A COMPLEX GENETIC BASIS FOR CONSPECIFIC POLLEN PRECEDENCE

2008

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“…Second, they uncover two genes that are mechanistically involved in CSP. Although studies have previously mapped QTL for CSP [35,36], no genes have yet been identified for this widespread post-mating pre-zygotic reproductive isolating barrier. (Note that neither Acp36DE nor CG9997, nor any other 'male gene' members of the Sex Peptide network, colocalize with the described CSP QTL in Drosophila [36]).…”

Section: Resultsmentioning

confidence: 99%

Intraspecific sperm competition genes enforce post-mating species barriers inDrosophila

Castillo

Moyle

2014

Proc. R. Soc. B.

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Sexual selection and sexual conflict are considered important drivers of speciation, based on both theoretical models and empirical correlations between sexually selected traits and diversification. However, whether reproductive isolation between species evolves directly as a consequence of intrapopulation sexual dynamics remains empirically unresolved, in part because knowledge of the genetic mechanisms (if any) connecting these processes is limited. Here, we provide evidence of a direct mechanistic link between intraspecies sexual selection and reproductive isolation. We examined genes with known roles in intraspecific sperm competition (ISC) in D. melanogaster and assayed their impact on conspecific sperm precedence (CSP). We found that two such genes (Acp36DE and CG9997) contribute to both offensive sperm competition and CSP; null/knockdown lines both had lower competitive ability against D. melanogaster conspecifics and were no longer able to displace heterospecific D. simulans sperm in competitive matings. In comparison, Sex Peptide (Acp70A)-another locus essential for ISC-does not contribute to CSP. These data indicate that two loci important for sperm competitive interactions have an additional role in similar interactions that enforce post-mating reproductive isolation between species, and show that sexual selection and sexual isolation can act on the same molecular targets in a gene-specific manner.

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“…In any case, given that entire chromosomes have no detectable effect on reproductive isolation, it is unlikely that the D. virilis-D. americana fertilization incompatibility is highly polygenic. In contrast, reproductive isolation due to competitive gametic interactions (i.e., competitive sperm/pollen precedence) has been shown to have a polygenic basis in other Drosophila species, crickets, and monkeyflowers (Civetta et al 2002;Britch et al 2007;Fishman et al 2008).…”

Section: Discussionmentioning

confidence: 99%

The Genetics of Postmating, Prezygotic Reproductive Isolation Between Drosophila virilis and D. americana

Sweigart

2010

Genetics

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Many studies have demonstrated the rapid diversification of reproductive genes that function after mating but before fertilization. This process might lead to the evolution of postmating, prezygotic barriers between species. Here, I investigate the phenotypic and genetic basis of postmating, prezygotic isolation between two closely related species of Drosophila, Drosophila virilis and D. americana. I show that a strong barrier to interspecific fertilization results in a 99% reduction in progeny production. A genetic interaction among maternal and paternal alleles at only a few loci prevents the fertilization of D. virilis females by D. americana males. These loci are autosomal and isolation acts recessively; the fertilization incompatibility is caused by at least two loci in the maternal D. virilis parent in combination with at least three loci in the paternal D. americana parent. These findings, together with results from classical experiments, suggest that malefemale coevolution within D. americana may have driven postmating, prezygotic isolation between species.

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Genetic Architecture of Conspecific Sperm Precedence inAllonemobius fasciatusandA. socius

Cited by 10 publications

References 57 publications

TOWARD THE EVOLUTIONARY GENOMICS OF GAMETOPHYTIC DIVERGENCE: PATTERNS OF TRANSMISSION RATIO DISTORTION IN MONKEYFLOWER (MIMULUS) HYBRIDS REVEAL A COMPLEX GENETIC BASIS FOR CONSPECIFIC POLLEN PRECEDENCE

TOWARD THE EVOLUTIONARY GENOMICS OF GAMETOPHYTIC DIVERGENCE: PATTERNS OF TRANSMISSION RATIO DISTORTION IN MONKEYFLOWER (MIMULUS) HYBRIDS REVEAL A COMPLEX GENETIC BASIS FOR CONSPECIFIC POLLEN PRECEDENCE

Intraspecific sperm competition genes enforce post-mating species barriers inDrosophila

The Genetics of Postmating, Prezygotic Reproductive Isolation Between Drosophila virilis and D. americana

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