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Rewrite The Textbooks: Transcription Is Bidirectional

Date:
January 27, 2009
Source:
European Molecular Biology Laboratory
Summary:
Researchers have now unraveled how yeast generates its transcripts and have come a step closer to understanding their function. The study redefines the concept of promoters (the start sites of transcription) contradicting the established notion that they support transcription in one direction only.

Genes that contain instructions for making proteins make up less than 2% of the human genome. Yet, for unknown reasons, most of our genome is transcribed into RNA. The same is true for many other organisms that are easier to study than humans. Researchers in the groups of Lars Steinmetz at the European Molecular Biology Laboratory (EMBL) in Heidelberg, Germany, and Wolfgang Huber at the European Bioinformatics Institute (EMBL-EBI) in Hinxton, UK, have now unravelled how yeast generates its transcripts and have come a step closer to understanding their function.

The study, published online in Nature, redefines the concept of promoters (the start sites of transcription) contradicting the established notion that they support transcription in one direction only. The results are also representative of transcription in humans.

Investigating all transcripts produced in a yeast cell, the scientists found that most regions of the yeast genome produce several transcripts starting at the same promoter. These transcripts are interleaved and overlapping on the DNA. In contrast to what was previously thought, the vast majority of promoters seem to initiate transcription in both directions.

Not all of the produced transcripts are stable, many are degraded rapidly making it difficult to observe what they do. While some of the RNA molecules might be 'transcriptional noise' without function, other transcripts control the expression of genes and production of proteins. The act of transcription itself is also likely to play an important role in regulation of gene expression. Transcribing one stretch of DNA might either help or in other cases interfere with the transcription of a gene close by. Moreover, transcripts without a current purpose can serve as 'raw material for evolution' and acquire new functions over time.

The results shed light on the complex organisation of the yeast genome and the insights gained extend to transcription in humans. A better understanding of transcription mechanisms could find application in new technologies to tune gene regulation in the future.


Story Source:

The above story is based on materials provided by European Molecular Biology Laboratory. Note: Materials may be edited for content and length.


Journal Reference:

  1. Xu et al. Bidirectional promoters generate pervasive transcription in yeast. Nature, Jan 25, 2009; DOI: 10.1038/nature07728

Cite This Page:

European Molecular Biology Laboratory. "Rewrite The Textbooks: Transcription Is Bidirectional." ScienceDaily. ScienceDaily, 27 January 2009. <www.sciencedaily.com/releases/2009/01/090125142123.htm>.
European Molecular Biology Laboratory. (2009, January 27). Rewrite The Textbooks: Transcription Is Bidirectional. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2009/01/090125142123.htm
European Molecular Biology Laboratory. "Rewrite The Textbooks: Transcription Is Bidirectional." ScienceDaily. www.sciencedaily.com/releases/2009/01/090125142123.htm (accessed July 25, 2014).

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