scholarly journals An RNA aptamer perturbs heat shock transcription factor activity in Drosophila melanogaster

2011 ◽  
Vol 39 (15) ◽  
pp. 6729-6740 ◽  
Author(s):  
H. Hans Salamanca ◽  
Nicholas Fuda ◽  
Hua Shi ◽  
John T. Lis
Keyword(s):  
Transcription Factor ◽  
Drosophila Melanogaster ◽  
Heat Shock ◽  
Heat Shock Transcription Factor ◽  
Rna Aptamer ◽  
Transcription Factor Activity ◽  
Factor Activity

Laboratory selection at different temperatures modifies heat-shock transcription factor (HSF) activation in Drosophila melanogaster

2001 ◽  
Vol 204 (2) ◽  
pp. 315-323 ◽  
Author(s):  
D.N. Lerman ◽  
M.E. Feder
Keyword(s):  
Transcription Factor ◽  
Drosophila Melanogaster ◽  
Heat Shock ◽  
Time Course ◽  
Stress Protein ◽  
Laboratory Culture ◽  
Heat Shock Transcription Factor ◽  
Mobility Shift ◽  
Laboratory Selection ◽  
Mobility Shift Assay

The magnitude and time course of activation of the heat-shock transcription factor (HSF) differ among Drosophila melanogaster lines evolving at 18 degrees C, 25 degrees C or 28 degrees C for more than 20 years. At lower heat-shock temperatures (27–35 degrees C), flies from the 18 degrees C population had higher levels of activated HSF (as detected by an electrophoretic mobility shift assay) than those reared at 25 degrees C and 28 degrees C. At higher temperatures (36 and 37 degrees C), however, the 28 degrees C flies had the highest levels of HSF. These differences persisted after one generation of acclimation at 25 degrees C, suggesting that phenotypic plasticity was limited. In addition, larvae from the 28 degrees C lines activated HSF less rapidly after a 35 degrees C heat shock than those from the 18 degrees C and 25 degrees C populations. These results are similar but not identical to previously reported differences in expression of Hsp70 (the major heat-inducible stress protein in Drosophila melanogaster) among the experimental lines. We conclude that HSF activation evolves rapidly during laboratory culture at diverse temperatures and could play an important role in the evolution of the heat-shock response.

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