Laboratory selection at different temperatures modifies heat-shock transcription factor (HSF) activation in Drosophila melanogaster.
J Exp Biol
; 204(Pt 2): 315-23, 2001 Jan.
Article
en En
| MEDLINE
| ID: mdl-11136617
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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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Factores de Transcripción
/
Proteínas de Insectos
/
Proteínas de Unión al ADN
/
Drosophila melanogaster
Límite:
Animals
Idioma:
En
Revista:
J Exp Biol
Año:
2001
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Reino Unido