Development Genes and Evolution

, Volume 219, Issue 11–12, pp 577–587

Partial co-option of the appendage patterning pathway in the development of abdominal appendages in the sepsid fly Themira biloba

Original Article

Abstract

The abdominal appendages on male Themira biloba (Diptera: Sepsidae) are complex novel structures used during mating. These abdominal appendages superficially resemble the serially homologous insect appendages in that they have a joint and a short segment that can be rotated. Non-genital appendages do not occur in adult pterygote insects, so these abdominal appendages are novel structures with no obvious ancestry. We investigated whether the genes that pattern the serially homologous insect appendages have been co-opted to pattern these novel abdominal appendages. Immunohistochemistry was used to determine the expression patterns of the genes extradenticle (exd), Distal-less (Dll), engrailed (en), Notch, and the Bithorax Complex in the appendages of T. biloba during pupation. The expression patterns of Exd, En, and Notch were consistent with the hypothesis that a portion of the patterning pathway that establishes the coxopodite has been co-opted to pattern the developing abdominal appendages. However, Dll was only expressed in the bristles of the developing appendages and not the proximal–distal axis of the appendage itself. The lack of Dll expression indicates the absence of a distal domain of the appendage suggesting that sepsid abdominal appendages only use genes that normally pattern the base of segmental appendages.

Keywords

Appendage Sepsidae Abdomen Innovation Co-option 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Center for Insect ScienceUniversity of ArizonaTucsonUSA
  2. 2.Department of BiologyDuke UniversityDurhamUSA

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