Incipient reproductive isolation  between Drosophila nasuta  and Drosophila albomicans

Inoue, Y.; Kitagawa, O.

doi:10.1051/gse:19900103

Cited by 4 publications

(11 citation statements)

References 7 publications

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“…By the standard methods, all interspecific F1 hybrids appeared to have normal or nearly normal fertility. As expected and consistent with previous studies [ 24 – 27 ], SRD was expressed in the F1 males from alb2♀ × nas3♂ (k = ∼0.9) but not in the F1 males from shl2♀ × nas3♂ and most of the other crosses (k = ∼0.5) ( S1 Fig ).…”

Section: Resultssupporting

confidence: 92%

“…1 ). There is almost no pre-mating isolation between these two species [ 23 ], and only weak hybrid breakdown was observed in the hybrids of advanced generations [ 24 , 25 ]. SRD is expressed in the F1 males produced by females of certain strains of D .…”

Section: Introductionmentioning

confidence: 99%

“…albomicans crossed to D . nasuta males [ 24 – 27 ]. The sex ratio (k, proportion of female) is skewed (k = ∼0.90) if the D .…”

Section: Introductionmentioning

confidence: 99%

“…albomicans strains are from Okinawa but normal (k = ∼0.50) if the strains are from Southeast Asia. There is an apparently increasing cline of SRD strength from SE Asia to Japan [ 24 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Sex Ratio Meiotic Drive as a Plausible Evolutionary Mechanism for Hybrid Male Sterility

et al. 2015

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Biological diversity on Earth depends on the multiplication of species or speciation, which is the evolution of reproductive isolation such as hybrid sterility between two new species. An unsolved puzzle is the exact mechanism(s) that causes two genomes to diverge from their common ancestor so that some divergent genes no longer function properly in the hybrids. Here we report genetic analyses of divergent genes controlling male fertility and sex ratio in two very young fruitfly species, Drosophila albomicans and D. nasuta. A majority of the genetic divergence for both traits is mapped to the same regions by quantitative trait loci mappings. With introgressions, six major loci are found to contribute to both traits. This genetic colocalization implicates that genes for hybrid male sterility have evolved primarily for controlling sex ratio. We propose that genetic conflicts over sex ratio may operate as a perpetual dynamo for genome divergence. This particular evolutionary mechanism may largely contribute to the rapid evolution of hybrid male sterility and the disproportionate enrichment of its underlying genes on the X chromosome – two patterns widely observed across animals.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

“…albomicans crossed to D . nasuta males [ 24 – 27 ]. The sex ratio (k, proportion of female) is skewed (k = ∼0.90) if the D .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sex Ratio Meiotic Drive as a Plausible Evolutionary Mechanism for Hybrid Male Sterility

et al. 2015

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“…If song cycles do exist in nasuta species, and they are species specific, then it may be irrelevant to the Thr-Gly region, for it is invariant among species. Another interpretation is that the ThrGly region encodes song cycles in the nasuta subgroup, and song cycles are similar (for the Thr-Gly region is invariant); enough evolutionary time has not passed for this region to evolve in this newly evolved species subgroup, where premating isolation is incomplete (Kitagawa et al 1982;Inoue and Kitagawa 1990). Also possible is that there is no song cycle in this subgroup, Fig.…”

mentioning

confidence: 99%

The period Gene: High Conservation of the Region Coding for Thr–Gly Dipeptides in the Drosophila nasuta Species Subgroup

et al. 1999

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In this study, the region corresponding to the Thr-Gly region of the period (per) gene in the Drosophila nasuta subgroup of species was sequenced. The results showed that this region was highly conserved in the D. nasuta subgroup. There were only nine variable sites found in this 300-bp-long region, all located in two small regions highly variable among Drosophila species. No length variation was observed either within this subgroup or in the Yunnan (YN) population of D. albomicans. The deduced amino acid sequences were identical for all 14 taxa in the D. nasuta subgroup, and a stretch of alternating Thr-Gly pairs was not observed in this subgroup. A phylogenetic tree was constructed. The clustering of some species was in general agreement with previous works, but it also raised some question on the phylogenetic relationship between the nasuta species. The data did not implicate the Thr-Gly region playing a role in behavioral isolation in this subgroup of Drosophila.

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Evidence for no sexual isolation between Drosophila albomicans and D. nasuta

Kim¹,

Phillips

Tao

2013

Ecology and Evolution

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Sexual isolation, the reduced tendency to mate, is one of the reproductive barriers that prevent gene flow between different species. Various species-specific signals during courtship contribute to sexual isolation between species. Drosophila albomicans and D. nasuta are closely related species of the nasuta subgroup within the Drosophila immigrans group and are distributed in allopatry. We analyzed mating behavior and courtship as well as cuticular hydrocarbon profiles within and between species. Here, we report that these two species randomly mated with each other. We did not observe any sexual isolation between species or between strains within species by multiple-choice tests. Significant difference in the courtship index was detected between these two species, but males and females of both species showed no discrimination against heterospecific partners. Significant quantitative variations in cuticular hydrocarbons between these two species were also found, but the cuticular hydrocarbons appear to play a negligible role in both courtship and sexual isolation between these two species. In contrast to the evident postzygotic isolation, the lack of sexual isolation between these two species suggests that the evolution of premating isolation may lag behind that of the intergenomic incompatibility, which might be driven by intragenomic conflicts.

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Incipient reproductive isolation between Drosophila nasuta and Drosophila albomicans

Cited by 4 publications

References 7 publications

Sex Ratio Meiotic Drive as a Plausible Evolutionary Mechanism for Hybrid Male Sterility

Sex Ratio Meiotic Drive as a Plausible Evolutionary Mechanism for Hybrid Male Sterility

The period Gene: High Conservation of the Region Coding for Thr–Gly Dipeptides in the Drosophila nasuta Species Subgroup

Evidence for no sexual isolation between Drosophila albomicans and D. nasuta

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