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Mapping of replication initiation sites in the mouse ribosomal gene cluster

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Abstract

We have used nascent strand determination analysis to map start sites of DNA replication in the mouse ribosomal gene cluster in which individual copies of the ribosomal genes are separated by intergenic spacer regions. One origin of bidirectional replication (OBR) was localized within a 3 kb region centered about 1.6 kb apstream of the rDNA transcription start site. At least one additional initiation site is situated near the 3′ end of the transcription unit. Adjacent to the OBR at the transcription start site are located two amplification-promoting sequences, i.e., APS1 and APS2. Nuclease-hypersensitive sites were identified in both the two APSs as well as in the OBR region, thus indicating that these sequences have an altered chromatin structure. In the OBR an intrinsically bent region, a purine-rich element and other prospective initiation zone components are found.

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Author notes

  1. I. Grummt

    Present address: Institut für Biochemie, Am Hubland, D-97074, Würzburg, Germany

Authors and Affiliations

  1. Institut für Biochemie, Universität Würzburg, Biozentrum, D-97074, Würzburg, Germany

    E. Gögel, E. Kunkel & F. Grummt

  2. Abteilung für Molekulare Biologie der Zelle II, Deutsches Krebsforschungszentrum, D-69120, Heidelberg, Germany

    G. Längst & I. Grummt

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  1. E. Gögel
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  2. G. Längst
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  3. I. Grummt
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  4. E. Kunkel
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  5. F. Grummt
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Gögel, E., Längst, G., Grummt, I. et al. Mapping of replication initiation sites in the mouse ribosomal gene cluster. Chromosoma 104, 511–518 (1996). https://doi.org/10.1007/BF00352115

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  • DOI: https://doi.org/10.1007/BF00352115

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