Abstract
The pattern of genetic variation across the genome of Drosophila melanogaster is consistent with the occurrence of frequent ‘selective sweeps’, in which new favourable mutations become incorporated into the species so quickly that linked alleles can ‘hitchhike’ and also become fixed1. Because of the hitchhiking of linked genes, it is generally difficult to identify the target of any putative selective sweep. Here, however, we identify a new gene in D. melanogaster that codes for a sperm-specific axonemal dynein subunit. The gene has a new testes-specific promoter derived from a protein-coding region in a gene encoding the cell-adhesion protein annexin X (AnnX), and it contains a new protein-coding exon derived from an intron in a gene encoding a cytoplasmic dynein intermediate chain (Cdic). The new transcription unit, designated Sdic (for sperm-specific dynein intermediate chain), has been duplicated about tenfold in a tandem array. Consistent with the selective sweep of this gene, the level of genetic polymorphism near Sdic is unusually low. The discovery of this gene supports other results that point to the rapid molecular evolution of male reproductive functions2,3,4.
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Acknowledgements
This work was supported by grants from the US Public Health Service. We thank W.Gilbert and S. R. Palumbi for their valuable suggestions and careful reading of the manuscript.
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Nurminsky, D., Nurminskaya, M., Aguiar, D. et al. Selective sweep of a newly evolved sperm-specific gene in Drosophila. Nature 396, 572–575 (1998). https://doi.org/10.1038/25126
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DOI: https://doi.org/10.1038/25126
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