title: Rapid identification of chromosomes carrying silver-stained nucleolus-organizing regions: application to case of 21/21 Robertsonian translocation.
abstract: The use of a combination of transmitted light and epiluminescence after silver and fluorescent staining of chromosome preparations makes it possible to achieve simultaneous visualization of silver-stained NORs and flourescent chromosomes. This technique permits exact localization of silver precipitates on normal and BrdU-substituted chromosomes. After previous silver impregnation, fluorescent staining by actinomycin-daunomycin-DAPI was used to induce a banding pattern that enables identification of specific chromosomes while observing silver-stained NORs at the same time. Application of this method to a Down's syndrome patient revealed a 21/21 Robertsonian translocation with NOR'S eliminated.
mesh_terms: D002466:Cell Nucleolus; D002478:Cells, Cultured; D002871:Chromosome Banding; D002877:Chromosomes, Human / Q000648:ultrastructure*; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics*; D006801:Humans; D008214:Lymphocytes / Q000648:ultrastructure; D012834:Silver; D014178:Translocation, Genetic
chemical_list: D012834:Silver