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Nucleic Acids Research, 1991, Vol. 19, No. 20 5689-5693
© 1991

MOLECULAR BIOLOGY

A short 5' region of the long terminal repeat is required for regulation by hormone and heat shock of Drospohila retrotransposan 1731

Patrick Ziarczvk and Martin Best-Belpomme

Groupe de Génétique celluiare et Moléculaire, URA-CNRS, Université Pierre et Marie curie BP 5, Bât A, Et 5, 7 Quai Saint-Bernad, 75005 Paris, France

Received July 1, 1991. Accepted September 26, 1991.

1731, a Drosophila retrotransposon was first described as having a transcription activity which was negatively regulated by 20-hydroxyecdysone (20-OH), the steroid molting hormone of insects. Using constructions expressing the bacterial chloramphenicol-acetyltransferase (CAT) gene under the control of the entire or deleted Long Terminal Repeats (LTRs) of 1731, we were able to show that a short (28 bp) sequence located in the U3 region of these LTRs was required for 1) the increase in promoter strength, 2) negative regulation by 20-OH and, 3) positive regulation by heat shock.


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