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Biochemistry (Moscow)

, Volume 83, Issue 2, pp 129–139 | Cite as

Comparison of Methods of Detection of Exceptional Sequences in Prokaryotic Genomes

  • I. S. Rusinov
  • A. S. Ershova
  • A. S. Karyagina
  • S. A. Spirin
  • A. V. Alexeevski
Article

Abstract

Many proteins need recognition of specific DNA sequences for functioning. The number of recognition sites and their distribution along the DNA might be of biological importance. For example, the number of restriction sites is often reduced in prokaryotic and phage genomes to decrease the probability of DNA cleavage by restriction endonucleases. We call a sequence an exceptional one if its frequency in a genome significantly differs from one predicted by some mathematical model. An exceptional sequence could be either under- or over-represented, depending on its frequency in comparison with the predicted one. Exceptional sequences could be considered biologically meaningful, for example, as targets of DNA-binding proteins or as parts of abundant repetitive elements. Several methods to predict frequency of a short sequence in a genome, based on actual frequencies of certain its subsequences, are used. The most popular are methods based on Markov chain models. But any rigorous comparison of the methods has not previously been performed. We compared three methods for the prediction of short sequence frequencies: the maximum-order Markov chain model-based method, the method that uses geometric mean of extended Markovian estimates, and the method that utilizes frequencies of all subsequences including discontiguous ones. We applied them to restriction sites in complete genomes of 2500 prokaryotic species and demonstrated that the results depend greatly on the method used: lists of 5% of the most under-represented sites differed by up to 50%. The method designed by Burge and coauthors in 1992, which utilizes all subsequences of the sequence, showed a higher precision than the other two methods both on prokaryotic genomes and randomly generated sequences after computational imitation of selective pressure. We propose this method as the first choice for detection of exceptional sequences in prokaryotic genomes.

Keywords

DNA sequence prokaryotic genome compositional bias Markov chain model restriction–modification system restriction sites 

Abbreviation (biaoti)

BCK

method of Burge and coauthors

bp

base pairs

CB

compositional bias

MM

method based on Markov chain model of maximum order

PBM

method of Pevzner and coauthors

R-M system

restriction–modification system.

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • I. S. Rusinov
    • 1
  • A. S. Ershova
    • 1
    • 2
    • 3
  • A. S. Karyagina
    • 1
    • 2
    • 3
  • S. A. Spirin
    • 1
    • 4
    • 5
  • A. V. Alexeevski
    • 1
    • 4
    • 5
  1. 1.Belozersky Institute of Physico-Chemical BiologyLomonosov Moscow State UniversityMoscowRussia
  2. 2.Gamaleya National Research Center of Epidemiology and MicrobiologyMinistry of Health of the Russian FederationMoscowRussia
  3. 3.All-Russia Research Institute of Agricultural BiotechnologyMoscowRussia
  4. 4.Institute of System StudiesMoscowRussia
  5. 5.Faculty of Bioengineering and BioinformaticsLomonosov Moscow State UniversityMoscowRussia

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