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

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...

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Bibliographic Details
Published in:Cytogenetic and Genome Research
Main Authors: Pendás, A.M., Morán, P., Garcia-Vázquez, E.
Format: Article in Journal/Newspaper
Language:English
Published: S. Karger AG 1993
Subjects:
Atlantic salmon
Online Access:http://dx.doi.org/10.1159/000133517
https://www.karger.com/Article/Pdf/133517
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Summary: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 short 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.

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