Journal of Molecular Evolution

, Volume 39, Issue 4, pp 331–339 | Cite as

Single-copy sequence homology among the GC-richest isochores of the genomes from warm-blooded vertebrates

  • Simone Cacciò
  • Paolo Perani
  • Salvatore Saccone
  • Farida Kadi
  • Giorgio Bernardi
Article

Abstract

We have hybridized a human DNA fraction corresponding to the GC-richest and gene-richest isochore family, H3, on compositional fractions of DNAs from 12 mammalian species and three avian species, representing eight and three orders, respectively. Under conditions in which repetitive sequences are competed out, the H3 isochore probe only or predominantly hybridized on the GC-richest fractions of main-band DNA from all the species investigated. These results indicate that single-copy sequences from the human H3 isochores share homology with sequences located in the compositionally corresponding compartments of the vertebrate genomes tested. These sequences are likely to be essentially formed by conserved coding sequences. The present results add to other lines of evidence indicating that isochore patterns are highly conserved in warm-blooded vertebrate genomes. Moreover, they refine recent reports (Sabeur et al., 1993; Kadi et al., 1993), and correct them in some details and also in demonstrating that the shrew genome does not exhibit the general mammalian pattern, but a special pattern.

Key words

Isochores Mammals Birds Single copy DNA sequences DNA/DNA hybridization 

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Copyright information

© Springer-Verlag New York Inc 1994

Authors and Affiliations

  • Simone Cacciò
    • 1
  • Paolo Perani
    • 1
  • Salvatore Saccone
    • 1
  • Farida Kadi
    • 1
  • Giorgio Bernardi
    • 1
  1. 1.Laboratoire de Génétique MoléculaireInstitut Jacques MonodPlace JussieuParisFrance

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