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Journal of Biological Chemistry
Article . 1996 . Peer-reviewed
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Journal of Biological Chemistry
Article
License: CC BY
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Transcriptional Silencing of a tRNA1 Copy from within a Multigene Family Is Modulated by Distal cis Elements

Authors: Sharma, Sujata; Gopinathan, Karumathil P;

Transcriptional Silencing of a tRNA1 Copy from within a Multigene Family Is Modulated by Distal cis Elements

Abstract

Individual copies of tRNA1Gly from within the multigene family in Bombyx mori could be classified based on in vitro transcription in homologous nuclear extracts into three categories of highly, moderately, or weakly transcribed genes. Segregation of the poorly transcribed gene copies 6 and 7, which are clustered in tandem within 425 base pairs, resulted in enhancement of their individual transcription levels, but the linkage itself had little influence on the transcriptional status. For these gene copies, when fused together generating a single coding region, transcription was barely detectable, which suggested the presence of negatively regulating elements located in the far flanking sequences. They exerted the silencing effect on transcription overriding the activity of positive regulatory elements. Systematic analysis of deletion, chimeric, and mutant constructs revealed the presence of a sequence element TATATAA located beyond 800 nucleotides upstream to the coding region acting as negative modulator, which when mutated resulted in high level transcription. Conversely, a TATATAA motif reintroduced at either far upstream or far downstream flanking regions exerted a negative effect on transcription. The location of cis-regulatory sequences at such farther distances from the coding region and the behavior of TATATAA element as negative regulator reported here are novel. These element(s) could play significant roles in activation or silencing of genes from within a multigene family, by recruitment or sequestration of transcription factors.

Related Organizations
Keywords

Microbiology & Cell Biology, 572, Transcription, Genetic, Restriction Mapping, Suppressor of Cytokine Signaling Proteins, RNA, Transfer, Gly, Bombyx, Immediate-Early Proteins, Development & Genetics (formed by the merger of DBGL and CRBME), Genes, Regulator, Molecular Reproduction, Animals, Plasmids, Sequence Deletion, Signal Transduction

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
6
Average
Average
Average
gold