The evolution of novelty in conserved genes; evidence of positive selection in the Drosophila fruitless gene is localised to alternatively spliced exons.

Publisher: Nature Publishing Group Country of Publication: England NLM ID: 0373007 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1365-2540 (Electronic) Linking ISSN: 0018067X NLM ISO Abbreviation: Heredity (Edinb) Subsets: MEDLINE

Publication: <2003->: London : Nature Publishing Group
Original Publication: London, Oliver and Boyd.

Alternative Splicing* ; Exons*; Drosophila/*genetics ; Drosophila Proteins/*genetics ; Nerve Tissue Proteins/*genetics ; Transcription Factors/*genetics; Amino Acid Sequence ; Animals ; Binding Sites ; Chromosome Mapping ; Conserved Sequence ; Drosophila melanogaster/genetics ; Female ; Male ; Models, Genetic ; Molecular Sequence Data ; Selection, Genetic

There has been much debate concerning whether cis-regulatory or coding changes are more likely to produce evolutionary innovation or adaptation in gene function, but an additional complication is that some genes can dramatically diverge through alternative splicing, increasing the diversity of gene function within a locus. The fruitless gene is a major transcription factor with a wide range of pleiotropic functions, including a fundamental conserved role in sexual differentiation, species-specific morphology and an important influence on male sexual behaviour. Here, we examine the structure of fruitless in multiple species of Drosophila, and determine the patterns of selective constraint acting across the coding region. We found that the pattern of selection, estimated from the ratio of non-synonymous to synonymous substitutions, varied considerably across the gene, with most regions of the gene evolutionarily conserved but with several regions showing evidence of divergence as a result of positive selection. The regions that showed evidence of positive selection were found to be localised to relatively consistent regions across multiple speciation events, and are associated with alternative splicing. Alternative splicing may thus provide a route to gene diversification in key regulatory loci.

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GENBANK KF005597; KF005598

0 (Drosophila Proteins)
0 (Nerve Tissue Proteins)
0 (Transcription Factors)
0 (fru protein, Drosophila)

Date Created: 20131024 Date Completed: 20140929 Latest Revision: 20211021

20221213

PMC3931162

10.1038/hdy.2013.106

24149653