Multilocus analysis of introgression between two sympatric sister species of Drosophila: Drosophila yakuba and D. santomea

Ana Llopart; Daniel Lachaise; Jerry A Coyne

doi:10.1534/genetics.104.033597

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Multilocus analysis of introgression between two sympatric sister species of Drosophila: Drosophila yakuba and D. santomea

Journal article

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Peer reviewed

Multilocus analysis of introgression between two sympatric sister species of Drosophila: Drosophila yakuba and D. santomea

Ana Llopart, Daniel Lachaise and Jerry A Coyne

Genetics (Austin), Vol.171(1), pp.197-210

09/2005

DOI: 10.1534/genetics.104.033597

PMCID: PMC1456511

PMID: 15965264

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Abstract

Drosophila yakuba is widely distributed in sub-Saharan Africa, while D. santomea is endemic to the volcanic island of São Tomé in the Atlantic Ocean, 280 km west of Gabon. On São Tomé, D. yakuba is found mainly in open lowland forests, and D. santomea is restricted to the wet misty forests at higher elevations. At intermediate elevations, the species form a hybrid zone where hybrids occur at a frequency of approximately 1%. To determine the extent of gene flow between these species we studied polymorphism and divergence patterns in 29 regions distributed throughout the genome, including mtDNA and three genes on the Y chromosome. This multilocus approach, together with the comparison to the two allopatric species D. mauritiana and D. sechellia, allowed us to distinguish between forces that should affect all genes and forces that should act on some genes (e.g., introgression). Our results show that D. yakuba mtDNA has replaced that of D. santomea and that there is also significant introgression for two nuclear genes, yellow and salr. The majority of genes, however, has remained distinct. These two species therefore do not form a "hybrid swarm" in which much of the genome shows substantial introgression while disruptive selection maintains distinctness for only a few traits (e.g., pigmentation and male genitalia).

Genes, Insect - genetics

Species Specificity

Molecular Sequence Data

Male

Chromosome Mapping

Gene Transfer, Horizontal

Phylogeny

Sequence Analysis, DNA

Y Chromosome - genetics

DNA - genetics

Genetic Variation

DNA - chemistry

Animals

DNA, Mitochondrial - genetics

Female

Models, Genetic

Drosophila Proteins - genetics

DNA, Mitochondrial - chemistry

Drosophila - genetics

Details

Title: Subtitle: Multilocus analysis of introgression between two sympatric sister species of Drosophila: Drosophila yakuba and D. santomea
Creators: Ana Llopart - Department of Ecology and Evolution, University of Chicago, Illinois 60637, USA. ana-llopart@uiowa.edu
Daniel Lachaise
Jerry A Coyne
Resource Type: Journal article
Publication Details: Genetics (Austin), Vol.171(1), pp.197-210
Publisher: United States
DOI: 10.1534/genetics.104.033597
PMID: 15965264
PMCID: PMC1456511
ISSN: 0016-6731
eISSN: 1943-2631
Grant note: GM58260 / NIGMS NIH HHS R01 GM058260 / NIGMS NIH HHS
Language: English
Date published: 09/2005
Academic Unit: Biology
Record Identifier: 9983992099302771

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