Keywords :
Animals; Base Sequence; Binding Sites/genetics; Carps/genetics; Cells, Cultured; DNA/genetics/metabolism; DNA Primers/genetics; Gene Expression; Genes, Reporter; HSP70 Heat-Shock Proteins/*genetics; Hot Temperature; Mutagenesis, Site-Directed; *Promoter Regions, Genetic; Sequence Homology, Amino Acid; Tilapia/*genetics; Transcription Factors/metabolism; Zebrafish/embryology/genetics
Abstract :
[en] We reported previously that a tilapia (Oreochromis mossambicus) heat shock protein 70 (HSP70) promoter is able to confer heat shock response on a reporter gene after transient expression both in cell culture and in microinjected zebrafish embryos. Here we present the first functional analysis of a fish HSP70 promoter, the tiHSP70 promoter. Using transient expression experiments in carp EPC (epithelioma papulosum cyprini) cells and in microinjected zebrafish embryos, we show that a distal heat shock response element (HSE1) at approx. -800 is predominantly responsible for the heat shock response of the tiHSP70 promoter. This element specifically binds an inducible transcription factor, most probably heat shock factor, and a constitutive factor. The constitutive complex is not observed with the non-functional, proximal HSE3 sequence, suggesting that both factors are required for the heat shock response mediated by HSE1.
Scopus citations®
without self-citations
9