Abstract:
BACKGROUND:Diversity in rates of gene expression is essential for basic cell functions and is controlled by a variety of intricate mechanisms. Revealing general mechanisms that control gene expression is important for understanding normal and pathological cell functions and for improving the design of expression systems. Here we analyzed the relationship between general features of genes and their contribution to expression levels. RESULTS:Genes were divided into four groups according to their core promoter type and their characteristics analyzed statistically. Surprisingly we found that small variations in the TATA box are linked to large differences in gene length. Genes containing canonical TATA are generally short whereas long genes are associated with either non-canonical TATA or TATA-less promoters. These differences in gene length are primarily determined by the size and number of introns. Generally, gene expression was found to be tightly correlated with the strength of the TATA-box. However significant reduction in gene expression levels were linked with long TATA-containing genes (canonical and non-canonical) whereas intron length hardly affected the expression of TATA-less genes. Interestingly, features associated with high translation are prevalent in TATA-containing genes suggesting that their protein production is also more efficient. CONCLUSION:Our results suggest that interplay between core promoter type and gene size can generate significant diversity in gene expression.
journal_name
BMC Genomicsjournal_title
BMC genomicsauthors
Moshonov S,Elfakess R,Golan-Mashiach M,Sinvani H,Dikstein Rdoi
10.1186/1471-2164-9-92subject
Has Abstractpub_date
2008-02-25 00:00:00pages
92issn
1471-2164pii
1471-2164-9-92journal_volume
9pub_type
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