title: [Issues on evolution of CpG islands in genome of Marek's disease virus].
abstract: OBJECTIVE
  To study the hypothesis about influence of one form of epigenetic heredity--DNA metylation--on several criteria of pathogenicity of avian herpesviruses using Marek's disease virus (MDV) as a model.
  
  
  METHODS
  Nucleotide sequences of genomic DNA of different serotypes of Marek's disease virus deposited in GenBank were used for the study. Analysis of distribution of CpG islands intra genome was performed with CPGPLOT program.
  
  
  RESULTS
  Distribution and number of CpG islands differed markedly in pathogenic serotype 1 and apathogenic serotypes 2 and 3 of MDV. Diagrams of CpG islands distribution showed that serotypes 2 and 3 have significantly higher numbers of islands and they are evenly distributed across genomes.
  
  
  CONCLUSIONS
  Lower numbers of CpG islands in MDV serotype 1 compared with serotypes 2 and 3 demonstrate presence of evolutionary pressure on pathogenic forms of MDV in order to escape from host cell's control of expression of viral proteins.
authors.forename: Iu G
authors.initials: IuG
authors.lastname: Iushkov
authors.forename: V N
authors.initials: VN
authors.lastname: Afoniushkin
authors.forename: V S
authors.initials: VS
authors.lastname: Gorodov
authors.forename: M L
authors.initials: ML
authors.lastname: Filipenko
authors.forename: U A
authors.initials: UA
authors.lastname: Boiarskikh
authors.forename: E V
authors.initials: EV
authors.lastname: Dudareva
mesh_terms: D000818:Animals; D018899:CpG Islands / Q000235:genetics*; D019175:DNA Methylation; D004279:DNA, Viral / Q000235:genetics / Q000378:metabolism; D044127:Epigenesis, Genetic; D019143:Evolution, Molecular; D005787:Gene Frequency; D025922:Mardivirus / Q000235:genetics / Q000472:pathogenicity*; D008380:Marek Disease / Q000821:virology*; D014774:Virulence
chemical_list: D004279:DNA, Viral