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The Drosophila translational control element (TCE) is required for high-level transcription of many genes that are specifically expressed in testes

Item Type:Article
Title:The Drosophila translational control element (TCE) is required for high-level transcription of many genes that are specifically expressed in testes
Creators Name:Katzenberger, R.J. and Rach, E.A. and Anderson, A.K. and Ohler, U. and Wassarman, D.A.
Abstract:To investigate the importance of core promoter elements for tissue-specific transcription of RNA polymerase II genes, we examined testis-specific transcription in Drosophila melanogaster. Bioinformatic analyses of core promoter sequences from 190 genes that are specifically expressed in testes identified a 10 bp A/T-rich motif that is identical to the translational control element (TCE). The TCE functions in the 5' untranslated region of Mst(3)CGP mRNAs to repress translation, and it also functions in a heterologous gene to regulate transcription. We found that among genes with focused initiation patterns, the TCE is significantly enriched in core promoters of genes that are specifically expressed in testes but not in core promoters of genes that are specifically expressed in other tissues. The TCE is variably located in core promoters and is conserved in melanogaster subgroup species, but conservation dramatically drops in more distant species. In transgenic flies, short (300-400 bp) genomic regions containing a TCE directed testis-specific transcription of a reporter gene. Mutation of the TCE significantly reduced but did not abolish reporter gene transcription indicating that the TCE is important but not essential for transcription activation. Finally, mutation of testis-specific TFIID (tTFIID) subunits significantly reduced the transcription of a subset of endogenous TCE-containing but not TCE-lacking genes, suggesting that tTFIID activity is limited to TCE-containing genes but that tTFIID is not an obligatory regulator of TCE-containing genes. Thus, the TCE is a core promoter element in a subset of genes that are specifically expressed in testes. Furthermore, the TCE regulates transcription in the context of short genomic regions, from variable locations in the core promoter, and both dependently and independently of tTFIID. These findings set the stage for determining the mechanism by which the TCE regulates testis-specific transcription and understanding the dual role of the TCE in translational and transcriptional regulation.
Keywords:Base Sequence, Cell Line, Drosophila Proteins, Gene Expression Profiling, Gene Expression Regulation, Genetic Promoter Regions, Genetic Transcription, Genetically Modified Animals, Insect Genes, Mutation, Nucleic Acid Regulatory Sequences, Protein Biosynthesis, Reverse Transcriptase Polymerase Chain Reaction, Sequence Homology, Nucleic Acid, Testis, Transcription Factor TFIID, Animals, Drosophila melanogaster
Source:PLoS ONE
ISSN:1932-6203
Publisher:Public Library of Science (U.S.A.)
Volume:7
Number:9
Page Range:e45009
Date:11 September 2012
Official Publication:https://doi.org/10.1371/journal.pone.0045009
PubMed:View item in PubMed

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