Bristles on the notum of many cyclorraphous flies are arranged into species-specific stereotyped patterns. Differences in the spatial expression of the proneural gene scute correlate with the positions of bristles in those species looked at so far. However, the examination of a number of genes encoding trans -regulatory factors, such as pannier , stripe , u-shaped , caupolican and wingless , indicates that they are expressed in conserved domains on the prospective notum. 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 . In contrast, in Anopheles gambiae , a basal species with no stereotyped bristle pattern, the expression patterns of pannier and wingless are not conserved, and expression of AgASH , the Anopheles proneural gene, does not correlate in a similar manner with the bristle pattern. We discuss the possibility that independently acting cis -regulatory sequences at the scute locus may have arisen in the lineage giving rise to cyclorraphous flies.
Development Genes and Evolution – Springer Journals
Published: Jul 1, 2006
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