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Mol. Cell. Biol., 03 1997, 1714-1721, Vol 17, No. 3
X Ye, P Fong, N Iizuka, D Choate and DR Cavener
The 5' untranslated regions (UTRs) of the Drosophila Ubx and Antp genes
were tested for their ability to promote cap-independent translation
initiation. The Ubx and the Antp 5' UTR were inserted between the CAT and
lacZ coding sequences in a dicistronic gene and tested for IRES activity in
transgenic Drosophila. Northern analysis of the mRNAs showed the presence
of the predicted full-length dicistronic mRNAs. High CAT activity was
expressed from the first cistron from all of the dicistronic constructs
introduced into the fly genome. The dicistronic transgenic strains bearing
the Ubx and Antp IRES elements expressed significant levels of
beta-galactosidase (betaGAL) from the second cistron whereas little or no
betaGAL was expressed in the controls lacking the IRESs. In situ analysis
of betaGAL expression in the transgenic strains indicates that expression
of the second cistron is spatially and temporally regulated. Although the
developmental patterns of expression directed by the Antp and Ubx IRESs
overlap, they exhibit several differences indicating that these IRESs are
not functionally equivalent.
Copyright © 1997, American Society for Microbiology
Ultrabithorax and Antennapedia 5' untranslated regions promote developmentally regulated internal translation initiation
Department of Molecular Biology, Vanderbilt University, Nashville, Tennessee 37235, USA.
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