Abstract
The wing patterns of butterflies and moths (Lepidoptera) are
diverse and striking examples of evolutionary diversification by
natural selection 1,2 . Lepidopteran wing colour patterns are a key
innovation, consisting of arrays of coloured scales. We still lack a
general understanding of how these patterns are controlled and
whether this control shows any commonality across the 160,000
moth and 17,000 butterfly species. Here, we use fine-scale mapping
with population genomics and gene expression analyses to identify
a gene, cortex, that regulates pattern switches in multiple species
across the mimetic radiation in Heliconius butterflies. cortex
belongs to a fast-evolving subfamily of the otherwise highly
conserved fizzy family of cell-cycle regulators 3 , suggesting that it
probably regulates pigmentation patterning by regulating scale
cell development. In parallel with findings in the peppered moth
(Biston betularia) 4 , our results suggest that this mechanism is
common within Lepidoptera and that cortex has become a major
target for natural selection acting on colour and pattern variation
in this group of insects.
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