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- W2062318740 startingPage "1447" @default.
- W2062318740 abstract "Physarum polycephalum rRNA genes are found on extrachromosomal 60 kb linear palindromlc DNA molecules. Previous work using electron microscope visualization suggested that these molecules are duplicated from one of four potential replication origins located in the 24 kb central non-transcribed spacer [Vogt and Braun (1977) Eur. J. Blochem ., 80, 557–566]. Considering the controversy on the nature of the replication origins in eukaryotic cells, where both site-specific or delocallzed Initiations have been described, we study here Physarum rDNA replication by two dimensional agarose gel electrophoresls and compare the results to those obtained by electron microscopy. Without the need of cell treatment or enrichment in replication Intermediates, we detect hybridization signals corresponding to replicating rDNA fragments throughout the cell cycle, confirming that the synthesis of rDNA molecules is not under the control of S-phase. The patterns of replication intermediates along rDNA minichromosomes are consistent with the existence of four site-specific replication origins, whose localization in the central non-transcribed spacer is in agreement with the electron microscope mapping. It Is also shown that, on a few molecules, at least two origins are active simultaneously." @default.
- W2062318740 created "2016-06-24" @default.
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- W2062318740 creator A5061449124 @default.
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- W2062318740 date "1995-01-01" @default.
- W2062318740 modified "2023-10-11" @default.
- W2062318740 title "Site-specific initiation of DNA replication within the non-transcribed spacer of<i>Physarum</i>rDNA" @default.
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- W2062318740 doi "https://doi.org/10.1093/nar/23.9.1447" @default.
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