Abstract：
BACKGROUND:Growth rate is central to the development of cells in all organisms. However, little is known about the impact of changing growth rates. We used continuous cultures to control growth rate and studied the transcriptional program of the model eukaryote Saccharomyces cerevisiae, with generation times varying between 2 and 35 hours. RESULTS:A total of 5930 transcripts were identified at the different growth rates studied. Consensus clustering of these revealed that half of all yeast genes are affected by the specific growth rate, and that the changes are similar to those found when cells are exposed to different types of stress (>80% overlap). Genes with decreased transcript levels in response to faster growth are largely of unknown function (>50%) whereas genes with increased transcript levels are involved in macromolecular biosynthesis such as those that encode ribosomal proteins. This group also covers most targets of the transcriptional activator RAP1, which is also known to be involved in replication. A positive correlation between the location of replication origins and the location of growth-regulated genes suggests a role for replication in growth rate regulation. CONCLUSION:Our data show that the cellular growth rate has great influence on transcriptional regulation. This, in turn, implies that one should be cautious when comparing mutants with different growth rates. Our findings also indicate that much of the regulation is coordinated via the chromosomal location of the affected genes, which may be valuable information for the control of heterologous gene expression in metabolic engineering.
journal_name
Genome Bioljournal_title
Genome biologyauthors
Regenberg B,Grotkjaer T,Winther O,Fausbøll A,Akesson M,Bro C,Hansen LK,Brunak S,Nielsen Jdoi
10.1186/gb-2006-7-11-r107subject
Has Abstractpub_date
2006-01-01 00:00:00pages
R107issue
11eissn
1474-7596issn
1474-760Xpii
gb-2006-7-11-r107journal_volume
7pub_type
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