Chromosome Research

, Volume 1, Issue 1, pp 63–67 | Cite as

Multi-chromosomal location of ribosomal RNA genes and heterochromatin association in brown trout

  • Alberto M. Pendás
  • Paloma Morán
  • Eva García-Vázquez
Research Papers


The ribosomal rRNA genes have been mapped by fluorescentin situ hybridization (FISH) to brown trout chromosomes. One major NOR chromosome pair and 8 novel minor NOR chromosome pairs have been found. Both major and minor NORs were closely related to polymorphic heterochromatin, as revealed by FISH and C-banding. These results are discussed with respect to NOR expression, the relationship between rDNA and heterochromatin, and evolutionary aspects.

Key words

brown trout fluorescentin situ hybridization heterochromatin rDNA 


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Copyright information

© Rapid Communications of Oxford Ltd 1993

Authors and Affiliations

  • Alberto M. Pendás
    • 1
  • Paloma Morán
    • 1
  • Eva García-Vázquez
    • 1
  1. 1.the Departmento de Biologia Funcional, Area de Genetica, Facultad de MedicinaUniversidad de OviedoOviedoSpain

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