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Type of publication: Journal Article
Type of document: Full Paper

Year: 2010

Authors: Nunes, MD; Wengel, PO; Kreissl, M; Schlötterer, C

Title: Multiple hybridization events between Drosophila simulans and Drosophila mauritiana are supported by mtDNA introgression.

Source: Mol Ecol. 2010; 19(21):4695-4707

Authors Vetmeduni Vienna:

Orozco ter Wengel Pablo
Santos Nunes Maria Daniela
Schlötterer Christian

Vetmed Research Units
Institute of Population Genetics

Project(s): Local selective sweeps in Drosophila melanogaster

The study of speciation has advanced considerably in the last decades because of the increased application of molecular tools. In particular, the quantification of gene flow between recently diverged species could be addressed. Drosophila simulans and Drosophila mauritiana diverged, probably allopatrically, from a common ancestor approximately 250,000 years ago. However, these species share one mitochondrial DNA (mtDNA) haplotype indicative of a recent episode of introgression. To study the extent of gene flow between these species, we took advantage of a large sample of D. mauritiana and employed a range of different markers, i.e. nuclear and mitochondrial sequences, and microsatellites. This allowed us to detect two new mtDNA haplotypes (MAU3 and MAU4). These haplotypes diverged quite recently from haplotypes of the siII group present in cosmopolitan populations of D. simulans. The mean divergence time of the most diverged haplotype (MAU4) is approximately 127,000 years, which is more than 100,000 years before the assumed speciation time. Interestingly, we also found some evidence for gene flow at the nuclear level because an excess of putatively neutral loci shows significantly reduced differentiation between D. simulans and D. mauritiana. Our results suggest that these species are exchanging genes more frequently than previously thought.

Keywords Pubmed: Animals
Cell Nucleus/genetics
DNA, Mitochondrial/genetics*
Evolution, Molecular*
Gene Flow*
Genes, Insect
Genetic Speciation
Genome, Insect
Hybridization, Genetic*
Microsatellite Repeats
Sequence Analysis, DNA

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