title: Ribosomal RNA genes are interspersed throughout a heterochromatic chromosome arm in Atlantic salmon.
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.
authors: Departamento de Biología Funcional, Facultad de Medicina, Universidad de Oviedo, Spain.
authors: A M
authors: AM
authors: Pendás
authors: P
authors: P
authors: Morán
authors: E
authors: E
authors: Garcia-Vázquez
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D002871:Chromosome Banding; D002874:Chromosome Mapping; D004275:DNA, Ribosomal; D006570:Heterochromatin; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D012335:RNA, Ribosomal / Q000235:genetics*; D012474:Salmon / Q000235:genetics*
chemical_list: D004275:DNA, Ribosomal; D006570:Heterochromatin; D012335:RNA, Ribosomal