Report The Molecular Basis of Sugar Sensing in Drosophila Larvae

Department of Chemistry, College of Science,Texas AM Figure 1A), sample soluble chemicals externally.Three internal taste organs, the dorsal, ventral, and posteriorpharyngeal sense organs (DPS, VPS, and PPS) monitor chem-icals as food passes through the pharynx (Figure 1A). About40 Gr genes are expressed in neurons of both the externaltaste organs, as well as in internal pharyngeal sense organs;however, none of the eight sugar Gr genes are expressed inlarval chemosensory neurons [19], even though larvae cansense most sugars [20].Larvae Exhibit High Sensitivity to Fructose and SucroseToidentifylarvalsugarreceptor(s),weadaptedthetwo-choicetaste assay developed by Schipanski and colleagues [20].w