Chromatin- and Transcription-Related Factors Repress Transcription from within Coding Regions throughout the Saccharomyces cerevisiae Genome

被引:228
作者
Cheung, Vanessa [1 ]
Chua, Gordon [2 ]
Batada, Nizar N. [1 ]
Landry, Christian R. [3 ,4 ]
Michnick, Stephen W. [3 ,4 ]
Hughes, Timothy R. [2 ]
Winston, Fred [1 ]
机构
[1] Harvard Univ, Sch Med, Dept Genet, Boston, MA 02115 USA
[2] Univ Toronto, Banting & Best Dept Med Res, Toronto, ON, Canada
[3] Univ Montreal, Dept Biochim, Montreal, PQ H3C 3J7, Canada
[4] Univ Montreal, Ctr Robert Cedergren, Montreal, PQ H3C 3J7, Canada
基金
美国国家卫生研究院;
关键词
D O I
10.1371/journal.pbio.0060277
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Previous studies in Saccharomyces cerevisiae have demonstrated that cryptic promoters within coding regions activate transcription in particular mutants. We 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 genome-wide, and to study the potential for expression of genetic information by cryptic transcription. Our 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, our 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.
引用
收藏
页码:2550 / 2562
页数:13
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