(CT)n (GA)n repeats and heat shock elements have distinct roles in chromatin structure and transcriptional activation of the Drosophila hsp26 gene.

Molecular and Cellular Biology
Q LuS C Elgin

Abstract

Previous analysis of the hsp26 gene of Drosophila melanogaster has shown that in addition to the TATA box and the proximal and distal heat shock elements (HSEs) (centered at -59 and -340, relative to the start site of transcription), a segment of (CT)n repeats at -135 to -85 is required for full heat shock inducibility (R.L. Glaser, G.H. Thomas, E.S. Siegfried, S.C.R. Elgin, and J.T. Lis, J. Mol. Biol. 211:751-761, 1990). This (CT)n element appears to contribute to formation of the wild-type chromatin structure of hsp26, an organized nucleosome array that leaves the HSEs in nucleosome-free, DNase I-hypersensitive (DH) sites (Q. Lu, L.L. Wallrath, B.D. Allan, R.L. Glaser, J.T. Lis, and S.C.R. Elgin, J. Mol. Biol. 225:985-998, 1992). Inspection of the sequences upstream of hsp26 has revealed an additional (CT)n element at -347 to -341, adjacent to the distal HSE. We have analyzed the contribution of this distal (CT)n element (-347 to -341), the proximal (CT)n element (-135 to -85), and the two HSEs both to the formation of the chromatin structure and to heat shock inducibility. hsp26 constructs containing site-directed mutations, deletions, substitutions, or rearrangements of these sequence elements have been fused in frame to th...Continue Reading

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Nov 12, 2013·FEBS Letters·Olga Kyrchanova, Pavel Georgiev
Dec 17, 2014·Proceedings of the National Academy of Sciences of the United States of America·Kevin H-C WeiAndrew G Clark
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