Chromatin - And Transcription-Related Factors Repress Transcription From Within Coding Regions Throughout The Saccharomyces Cerevisiae Genome

Main Category: Genetics
Also Included In: Biology / Biochemistry
Article Date: 11 Nov 2008 - 2:00 PDT

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Previous studies in Saccharomyces cerevisiae have demonstrated that cryptic promoters within coding regions activate transcription in particular mutants. The authors have performed a comprehensive analysis of cryptic transcription in order to identify factors that normally repress cryptic promoters, to determine the amount of cryptic transcription genomewide, and to study the potential for expression of genetic information by cryptic transcription. Their results show that a large number of factors that control chromatin structure and transcription are required to repress cryptic transcription from at least 1,000 locations across the S. cerevisiae genome.

Two results suggest that some cryptic transcripts are translated. First, as expected, many cryptic transcripts contain an ATG and an open reading frame of at least 100 codons. Second, several cryptic transcripts are translated into proteins.

Furthermore, a subset of cryptic transcripts tested is transiently induced in wild-type cells following a nutritional shift, suggesting a possible physiological role in response to a change in growth conditions. Taken together, the results demonstrate that, during normal growth, the global integrity of gene expression is maintained by a wide range of factors and suggest that, under altered genetic or physiological conditions, the expression of alternative genetic information may occur.

Cheung V, Chua G, Batada NN, Landry CR, Michnick SW, et al. (2008)
"Chromatin- and transcription-related factors repress transcription from within coding regions throughout the Saccharomyces cerevisiae genome."
PLoS Biol 6(11): e277. doi:10.1371/journal.pbio.0060277
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