title: Investigating extended regulatory regions of genomic DNA sequences.
abstract: BACKGROUND
  Despite the growing volume of data on primary nucleotide sequences, the regulatory regions remain a major puzzle with regard to their function. Numerous recognising programs considering a diversity of properties of regulatory regions have been developed. The system proposed here allows the specific contextual, conformational and physico-chemical properties to be revealed based on analysis of extended DNA regions.
  
  
  RESULTS
  The Internet-accessible computer system RegScan, designed to analyse the extended regulatory regions of eukaryotic genes, has been developed. The computer system comprises the following software: (i) programs for classification dividing a set of promoters into TATA-containing and TATA-less promoters and promoters with and without CpG islands; (ii) programs for constructing (a) nucleotide frequency profiles, (b) sequence complexity profiles and (c) profiles of conformational and physico-chemical properties; (iii) the program for constructing the sets of degenerate oligonucleotide motifs of a specified length; and (iv) the program searching for and visualising repeats in nucleotide sequences. The system has allowed us to demonstrate the following characteristic patterns of vertebrate promoter regions: the TATA box region is flanked by regions with an increased G+C content and increased bending stiffness, the TATA box content is asymmetric and promoter regions are saturated with both direct and inverted repeats.
  
  
  BACKGROUND
  The computer system RegScan is available via the Internet at http://www.mgs.bionet.nsc. ru/Systems/RegScan, http://www.cbil.upenn.edu/mgs/systems/r egscan/.
authors.affiliation: Laboratory of Theoretical Genetics, Institute of Cytology and Genetics, Lavrentyev Avenue, 10, Novosibirsk, 630090, Russia. bob@bionet.nsc.ru
authors.forename: V N
authors.initials: VN
authors.lastname: Babenko
authors.forename: P S
authors.initials: PS
authors.lastname: Kosarev
authors.forename: O V
authors.initials: OV
authors.lastname: Vishnevsky
authors.forename: V G
authors.initials: VG
authors.lastname: Levitsky
authors.forename: V V
authors.initials: VV
authors.lastname: Basin
authors.forename: A S
authors.initials: AS
authors.lastname: Frolov
mesh_terms: D000465:Algorithms; D000818:Animals; D001483:Base Sequence; D003199:Computer Systems; D018899:CpG Islands; D004247:DNA / Q000235:genetics*; D016208:Databases, Factual; D005809:Genes, Regulator; D020407:Internet; D011401:Promoter Regions, Genetic; D012984:Software; D016385:TATA Box
chemical_list: D004247:DNA