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...
Published in: | Cytogenetic and Genome Research |
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Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
S. Karger AG
1993
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Subjects: | |
Online Access: | http://dx.doi.org/10.1159/000133517 https://www.karger.com/Article/Pdf/133517 |
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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