Cytological evidence on the ability of the nucleolus organizing regions to assemble pre-existing nucleolar material.
The treatment of Vicia faba root tips with 5-azacytidine caused unequal allotment of the chromosomes; after one cell cycle, a pair of daughter nuclei was produced, one of which carried the nucleolus organizing regions (NORs) and the other of which lacked them. The pre-existing nucleolar material brought into the NOR-carrying daughter nucleus by the chromosomes disappeared concurrently with the appearance of the new nucleoli, whereas in another daughter nucleus without the NOR a number of small nucleolus-like bodies became visible at random positions. These findings suggest that in addition to ribosomal RNA synthesis the NOR has another role in cells; to stimulate the pre-existing nucleolar material to assemble at the NOR itself.
D001374:Azacitidine / Q000494:pharmacology*; D008938:Mitosis; D009697:Nucleolus Organizer Region / Q000502:physiology* / Q000648:ultrastructure; D010944:Plants; D012261:Ribonucleoproteins / Q000378:metabolism
D012261:Ribonucleoproteins; D001374:Azacitidine