Imprecise excision of the progenitor insertion, resulting in a 1.0kb deletion of genomic sequences in the direction of Gr5a (removing the promoter, 5' leader sequences and a 253bp sequence removing exon 1, intron 1 and part of exon 2). The 3' end of the progenitor insertion has been precisely excised, leaving the Tre1 gene structure intact.
1000 bp deletion associated with the precise excision of P{EP}Tre1EP496 (GB:AB066612).
Stimulation of long labellar taste bristles in mutant flies with trehalose induces significantly fewer biphasic spikes than seen in wild-type.
Stimulation of long labellar taste bristles in TreΔEP19 mutant flies with trehalose induces significantly fewer biphasic spikes than seen in wild-type.
Impulse discharges from I-type hairs in response to trehalose stimulation are diminished in Gr5aΔEP19 mutants compared to wild-type.
Electrophysiological response to sugars in individual labellar taste hairs of the large and medium class shows normal response to sucrose but drastically reduced response to trehalose, in comparison with parental P{EP}Tre1EP496 strain. In a two choice preference test with sucrose and trehalose, mutants show dramatically reduced response to trehalose, when compared to the parental P{EP}Tre1EP496 strain.
Flies show reduced sensitivity to trehalose in a feeding preference test.