Nucleic Acids Research, 1983, Vol. 11, No. 14 4713-4725
© 1983
MOLECULAR BIOLOGY |
Transcription initiation of transfected mouse mammary tumor virus LTR DNA is regulated by glucocorticoid hormones
Kernforschungszentrum Karlsruhe, Institut fur Genetik und Toxikologie Postfach 3640, D-7500 Karlsruhe 1, FRG
Received May 20, 1983. Accepted June 24, 1983.
A chimeric gene, recombined in vitro, containing a long terminal repeat (LTR) sequence from the proviral DNA of mouse mammary tumor virus and the thymidine kinase (tk) gene of Herpes Simplex Virus was introduced into L tk cells. No transcription of LTR RNA was observed in transfected cells when glucocorticoid hormones were absent from the growth medium. Accumulation of LTR initiated RNA was measured upon hormone addition by the single strand specific nuclease RNA mapping procedure. The accumulation was rapid (detectable after 7.5 minutes), independent of simultaneous protein synthesis and mediated by a functional glucocorticoid receptor complex. Glucocorticoid hormones affect LTR transcription at the level of initiation. The rate of initiation (1.8x102 molecules/cell/sec) and a half life of about 30 minutes could be calculated for LTR RNA. The half life of LTR RNA is independent of the presence of hormone.
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