A microsatellite linkage map for Drosophila montana shows large variation in recombination rates, and a courtship song trait maps to an area of low recombination
Current advances in genetic analysis are opening up our knowledge of the genetics of species differences, but challenges remain, particularly for out-bred natural populations. We constructed a microsatellite-based linkage map for two out-bred lines of Drosophila montana derived from divergent populations by taking advantage of the Drosophila virilis genome and available cytological maps of both species. Although the placement of markers was quite consistent with cytological predictions, the map indicated large heterogeneity in recombination rates along chromosomes. We also performed a quantitative trait locus (QTL) analysis on a courtship song character (carrier frequency), which differs between populations and is subject to strong sexual selection. Linkage mapping yielded two significant QTLs, which explained 3% and 14% of the variation in carrier frequency, respectively. Interestingly, as in other recent studies of traits which can influence speciation, the strongest QTL mapped to a genomic region partly covered by an inversion polymorphism.
Document Type: Research Article
Affiliations: 1: Centre of Excellence in Evolutionary Research, Department of Biological and Environmental Science, University of Jyväskylä, Finland 2: Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal 3: Dyers Brae House, School of Biology, University of St Andrews, Scotland, UK 4: Institut für Populationsgenetik, Josef Baumann Gasse 1, Wien, Austria
Publication date: 01 March 2010