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The evolution of DNA regulatory regions for proteo-gamma bacteria by interspecies comparisons

Item Type:Article
Title:The evolution of DNA regulatory regions for proteo-gamma bacteria by interspecies comparisons
Creators Name:Rajewsky, N. and Socci, N.D. and Zapotocky, M. and Siggia, E.D.
Abstract:The comparison of homologous noncoding DNA for organisms a suitable evolutionary distance apart is a powerful tool for the identification of cis regulatory elements for transcription and translation and for the study of how they assemble into functional modules. We have fit the three parameters of an affine global probabilistic alignment algorithm to establish the background mutation rate of noncoding sequence between E. coli and a series of gamma proteobacteria ranging from Salmonella to Vibrio. The lower bound we find to the neutral mutation rate is sufficiently high, even for Salmonella, that most of the conservation of noncoding sequence is indicative of selective pressures rather than of insufficient time to evolve. We then use a local version of the alignment algorithm combined with our inferred background mutation rate to assign a significance to the degree of local sequence conservation between orthologous genes, and thereby deduce a probability profile for the upstream regulatory region of all E. coli protein-coding genes. We recover 75%-85% (depending on significance level) of all regulatory sites from a standard compilation for E. coli, and 66%-85% of sigma sites. We also trace the evolution of known regulatory sites and the groups associated with a given transcription factor. Furthermore, we find that approximately one-third of paralogous gene pairs in E. coli have a significant degree of correlation in their regulatory sequence. Finally, we demonstrate an inverse correlation between the rate of evolution of transcription factors and the number of genes they regulate. Our predictions are available at http://www.physics.rockefeller.edu/~siggia.
Keywords:Algorithms, Binding Sites, Bacterial DNA, Molecular Evolution, Gammaproteobacteria, Bacterial Genes, Nucleic Acid Regulatory Sequences, Species Specificity, Transcription Factors
Source:Genome Research
ISSN:1088-9051
Publisher:Cold Spring Harbor Laboratory Press (U.S.A.)
Volume:12
Number:2
Page Range:298-308
Date:February 2002
Official Publication:https://doi.org/10.1101/gr.207502
PubMed:View item in PubMed

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