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• W2048610322 abstract "The location of ribosomal RNA (rRNA) genes in the nuclei of the ciliated protozoan, Oxytricha fallax, was analysed by in situ hybridization. The micronuclear genome of O. fallax has typical chromosomal DNA organization. Macronuclei, although derived from micronuclei, lack chromosomes and instead contain short pieces of DNA ranging from 500 to 20 000 base pairs in length. In situ hybridization was carried out to determine if specific DNA sequences are limited to certain locations within the macronucleus, or if sequences are randomly arranged. Cells were fixed, squashed and then hybridized with 3H-labelled RNA synthesized in vitro using cloned O. fallax rDNA as a template. After autoradiography, silver grains were found to be distributed uniformly over the entire macronucleus without any detectable localization to specific regions. The uniformity of hybridization indicates that rDNA molecules are randomly dispersed throughout the macronucleus and suggests that the macronuclear genetic apparatus lacks any substantial multimolecular organization. S phase macronuclei also showed a uniform distribution of rDNA molecules, irrespective of the position of the replication band at which DNA synthesis takes place. The micronuclei, in contrast, did not show any hybridization, even in cells in which macronuclei were heavily labelled. Macronuclear anlagen, in which the micronuclear chromosomes are polytenized, also do not hybridize. This absence of hybridization indicates a much lower concentration of rDNA in the micronucleus than in the macronucleus. The change in rDNA concentration of rRNA genes presumably occurs during the complicated process of development of a macronucleus from a micronucleus." @default.
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• W2048610322 date "1981-10-01" @default.
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• W2048610322 title "Localization of genes for ribosomal RNA in the nuclei of Oxytricha fallax" @default.
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• W2048610322 doi "https://doi.org/10.1016/0014-4827(81)90175-0" @default.
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