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. 1984 Dec;4(12):2714–2722. doi: 10.1128/mcb.4.12.2714

Transcription factor binding is limited by the 5'-flanking regions of a Drosophila tRNAHis gene and a tRNAHis pseudogene.

L Cooley, J Schaack, D J Burke, B Thomas, D Söll
PMCID: PMC369281  PMID: 6570190

Abstract

We determined the sequence of a Drosophila tRNA gene cluster containing a tRNAHis gene and a tRNAHis pseudogene in close proximity on the same DNA strand. The pseudogene contains eight consecutive base pairs different from the region of the bona fide gene which codes for the 3' portion of the anticodon stem of tRNAHis. The tRNAHis gene is transcribed efficiently in Drosophila Kc cell extract, whereas the pseudogene is not. The pseudogene is also a much poorer competitor than the real gene in a stable transcription complex formation assay, even though the sequence alteration in the pseudogene does not affect the sequence or spacing of the putative internal transcription control regions. Recombinant clones were constructed in which the 5'-flanking regions are exchanged. The transcription efficiencies and competitive abilities of the recombinant clones resemble those of the genes from which the 5' flank was derived; for example, the tRNAHis pseudogene with the 5'-flanking sequence of the tRNAHis gene is now efficiently transcribed. Deletion analysis of the pseudogene 5' flank failed to uncover an inhibitory element. Deletion analysis of the real gene showed very high dependence on the presence of the wild-type 5'-flanking sequence for factor binding to the internal control regions and stable complex formation. The 5'-flanking sequence of a Drosophila tRNAArg gene active in the Drosophila Kc cell extract does not restore transcriptional activity or stable complex formation. The tRNAHis gene and pseudogene behave atypically in HeLa cell extract. Both genes compete for HeLa transcription factors, but neither of them is efficiently transcribed. Removal of the 5'-flanking sequences of each gene and replacement with various sequences, including the tRNAArg gene 5' flank, does not allow increased transcription in HeLa cell extract.

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Selected References

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