Researchers visualising and comparing the expression of prominent developmental genes in the embryonic legs and larval wings of the butterfly species Bicyclus anynana found high spatial congruence in the order of proximal–distal gene expression between the two appendages. This observation provides evidence that a leg proximal–distal patterning network was partially co-opted during insect wing evolution.
The investigation examined the expression domains of twelve appendage patterning genes that subdivide developing insect legs into distal, medial, or proximal regions: homothorax, extradenticle, teashirt, dachshund, Distal-less, spineless, rotund, bric-à-brac, Bar, aristaless, Lim, and apterous. In addition, the study evaluated two genes that refine the proximal–distal axis following initial specification in both wings and legs—fringe and brother of odd with entrails limited—alongside three morphogens, comprising wingless, decapentaplegic, and vein.
A notable observation in the butterfly wing was a distinct loss of the medial domain relative to the leg, supported by the absence of broad dachshund expression, which mirrors patterns previously recorded in flies. Both insect wings and legs develop along a proximal–distal axis patterned during development, a process previously detailed in the derived model insect Drosophila melanogaster, where both traits originate as imaginal discs.
Further comparative analyses with Drosophila highlighted both conserved and lineage-specific regulatory architectures between the two insect lineages. The researchers reported that these findings suggest a deeply conserved proximal–distal patterning logic across Mecopterida, while pointing to divergent mechanisms that likely facilitated the morphological innovation of insect wings.
Subject of Research: Insect appendage development and proximal-distal gene patterning
Article Title: Parallels in leg and wing proximal-distal patterning in Diptera and Lepidoptera
Article References: Lee, J., Banerjee, T. D., & Monteiro, A. (2026). Parallels in leg and wing proximal-distal patterning in Diptera and Lepidoptera. Developmental Biology Advances. https://doi.org/10.1186/s13227-026-00279-5
Image Credits: AI Generated
DOI: 10.1186/s13227-026-00279-5
Keywords: Bicyclus anynana, Drosophila melanogaster, proximal-distal patterning, wing development, leg development, insect appendages, evolutionary developmental biology, gene expression, Parallels, wing, proximal-distal, patterning
News Source: Juliet Wilcox. (November 5, 2026). Butterfly Study Reveals Shared Gene Patterning Between Insect Legs and Wings. Scienmag.
