Bristles on the notum of many cyclorraphous flies are arranged into species-specific stereotyped patterns. The positions of bristles correlate with differences in the spatial expression of the scute (sc) gene in those species examined so far. However, a major upstream activator of scute , Pannier (Pnr), is expressed in a conserved domain over the entire medial notum. Here we examine the expression patterns in Calliphora vicina of stripe ( sr ), u-shaped ( ush ), caupolican ( caup ) and wingless ( wg ), genes known to modify the activity of Pnr or to act downstream of Pnr in Drosophila . We find that, with minor differences, their expression patterns are conserved. This suggests that the function of a trans -regulatory network of genes is relatively unchanged in derived Diptera and that many differences are likely to be due to changes in cis -regulatory sequences of scute .
Development Genes and Evolution – Springer Journals
Published: Jan 1, 2006
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