The adaptive significance of chromosomal inversion polymorphisms in Drosophila melanogaster - PubMed

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• PMID: 30230076
• DOI: 10.1111/mec.14871

The adaptive significance of chromosomal inversion polymorphisms in Drosophila melanogaster

Martin Kapun et al. Mol Ecol. 2019 Mar.

Abstract

Chromosomal inversions, structural mutations that reverse a segment of a chromosome, cause suppression of recombination in the heterozygous state. Several studies have shown that inversion polymorphisms can form clines or fluctuate predictably in frequency over seasonal time spans. These observations prompted the hypothesis that chromosomal rearrangements might be subject to spatially and/or temporally varying selection. Here, we review what has been learned about the adaptive significance of inversion polymorphisms in the vinegar fly Drosophila melanogaster, the species in which they were first discovered by Sturtevant in 1917. A large body of work provides compelling evidence that several inversions in this system are adaptive; however, the precise selective mechanisms that maintain them polymorphic in natural populations remain poorly understood. Recent advances in population genomics, modelling and functional genetics promise to greatly improve our understanding of this long-standing and fundamental problem in the near future.

Keywords: Drosophila melanogaster; chromosomal inversions; clines; fitness; recombination; selection.

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