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The X chromosome of Drosophila shows a deficiency of genes with male-biased expression, whereas mammalian X chromosomes are enriched for spermatogenesis genes expressed premeiosis and multicopy testis genes. Meiotic X-inactivation and sexual antagonism can only partly account for these patterns. Here, we show that dosage compensation (DC) in Drosophila may(More)
Genome duplication is a powerful evolutionary force and is arguably most prominent in plants, where several ancient whole-genome duplication events have been documented. Models of gene evolution predict that functional divergence between duplicates (subfunctionalization) is caused by the loss of regulatory elements. Studies of conserved non-coding sequences(More)
The goal of this study was to assess the extent to which transposable elements (TEs) have contributed to protein-coding regions in Arabidopsis thaliana. To do this, we first characterized the extent of chimeric TE-gene constructs. We compared a genome-wide TE database to genomic sequences, annotated coding regions, and EST data. The comparison revealed that(More)
Transposable elements (TEs) are the major component of most plant genomes, and characterizing their population dynamics is key to understanding plant genome complexity. Yet there have been few studies of TE population genetics in plant systems. To study the roles of selection, transposition, and demography in shaping TE population diversity, we generated a(More)
Drosophila X chromosomes are disproportionate sources of duplicated genes, and these duplications are usually the result of retrotransposition of X-linked genes to the autosomes. The excess duplication is thought to be driven by natural selection for two reasons: X chromosomes are inactivated during spermatogenesis, and the derived copies of retroposed(More)
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