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Published on: May 28, 2007
Segmentation gene expression and function in Vanessa cardui, an emerging model for Lepidoptera.
Biorxiv : the Preprint Server for Biology
|June 12, 2026
Summary
Butterflies utilize a specific set of pair-rule (PR) genes for segmentation, distinct from those in fruit flies or other insects. This research reveals unique gene functions in butterflies, suggesting evolutionary rewiring of segmentation networks in Lepidoptera.
Area of Science:
- Developmental Biology
- Evolutionary Genetics
- Entomology
Background:
- Insect segmentation relies on conserved pair-rule (PR) genes, but gene usage varies across distantly related species.
- Lepidoptera (moths and butterflies) were previously shown to lack the conserved PR-gene 'paired'.
Purpose of the Study:
- To investigate the expression and function of PR-genes in the Lepidoptera clade using the painted lady butterfly, *Vanessa cardui*, as a model.
- To understand the evolutionary conservation and divergence of PR-gene roles in insect segmentation.
Main Methods:
- Comparative gene expression analysis of PR-gene orthologs in *Vanessa cardui*.
- Functional studies to assess the role of PR-genes in butterfly abdominal segmentation.
Main Results:
- Four *Drosophila* PR-gene orthologs are expressed in PR-like stripes in *Vanessa*, with at least one exhibiting PR-like function.
- Genes with PR-roles in Hemiptera but not *Drosophila* do not function as PR-genes in *Vanessa*.
- The hemipteran PR-gene *Blimp1* has a novel role in abdominal segmentation in *Vanessa*.
Conclusions:
- Butterflies share some PR-patterning mechanisms with other insects but use a distinct subset of *Drosophila* PR-gene orthologs.
- Lepidoptera have not adopted Hemiptera-specific PR-orthologs for segmentation.
- These findings indicate significant rewiring of the segmentation gene regulatory network within Lepidoptera.
