Contrasted polymorphism patterns in a large sample of populations from the evolutionary genetics model Drosophila simulans

被引:29
作者
Baudry, Emmanuelle
Derome, Nicolas
Huet, Michele
Veuille, Michel
机构
[1] Univ Paris 06, Ecole Prat Hautes Etud, Ecol Lab, F-75252 Paris 05, France
[2] Univ Laval, Dept Biol, Ste Foy, PQ G1K 7P4, Canada
关键词
D O I
10.1534/genetics.105.046250
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
African populations of Drosophila simulans are thought to be ancestral in this model species and are increasingly used for testing general hypotheses in evolutionary genetics. It is often assumed that African populations are more likely to be at a neutral Mutation drift equilibrium than other populations. Here we examine population structuring and the demographic profile in nine populations of D. simulans. We surveyed sequence variation in four X-linked genes (runt, sevenless, Sex-lethal, and vermilion) that have been used in a parallel study in the closely related species D. melanogaster We found that an eastern group Of populations from continental Africa and Indian Ocean islands (Kenya, Tanzania, Madagascar, and Mayotte Island) is widespread, shows little differentiation, and has probably undergone demographic expansion. The other two African populations surveyed (Cameroon and Zimbabwe) show no evidence of population expansion and are markedly differentiated from each other as well as front the populations front the eastern group. Two other populations, Europe and Antilles, are probably recent invaders to these areas. The Antilles population is probably derived from Europe through a substantial bottleneck. The history of these populations should be taken into account when drawing general Conclusions front variation patterns.
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页码:759 / 767
页数:9
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