Ribosomal RNA genes are interspersed throughout a heterochromatic chromosome arm in Atlantic salmon

Cytogenet Cell Genet. 1993;63(2):128-30. doi: 10.1159/000133517.

Abstract

The ribosomal RNA genes (rDNA) have been mapped by fluorescent in situ hybridization (FISH) using four rDNA probes (rDNA/FISH) to Atlantic salmon chromosomes. Signals appeared over the whole heterochromatic chromosome arm displaying the secondary constriction and satellites. The size polymorphism of this sort arm, revealed by C-banding, was confirmed by rDNA/FISH, supporting large interindividual differences in the number of rDNA copies. Conventional techniques for the detection of nucleolar organizer regions are discussed, and their results are compared with those of rDNA/FISH.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cells, Cultured
  • Chromosome Banding
  • Chromosome Mapping
  • DNA, Ribosomal
  • Heterochromatin*
  • In Situ Hybridization, Fluorescence
  • Karyotyping
  • RNA, Ribosomal / genetics*
  • Salmon / genetics*

Substances

  • DNA, Ribosomal
  • Heterochromatin
  • RNA, Ribosomal