Cover
Butterfly eyespots.
Many species in the butterfly family Nymphalidae are characterized by conspicuous eyespot patterns on their wings. In this issue, Oliver et al. show that these eyespots and the expression of associated developmental genes evolved once, approximately 90 million years ago. In some lineages however, gene expression underwent significant changes, with many genes being turned off without a corresponding loss of eyespots. These data suggest that the origin of novel traits proceeds via the co-option of complex, preexisting gene regulatory networks that later become streamlined for their novel function.
Image Credit: Jeffrey C. Oliver (Yale University).
Perspectives
Chromosome Territories Meet a Condensin
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