DNA replication in nucleus-free xenopus egg extracts

Ronald Lebofsky, Tatsuro Takahashi, Johannes C. Walter

Research output: Chapter in Book/Report/Conference proceedingChapter

76 Citations (Scopus)


Extracts derived from Xenopus laevis eggs represent a powerful cell-free system to study eukaryotic DNA replication. A variation of the system allows for DNA replication not only in a cell-free environment, but also in the absence of a nucleus. In this nucleus-free system, DNA templates are licensed with High-Speed Supernatant (HSS) and then replicated with a concentrated NucleoPlasmic Extract (NPE). This method has the advantage of allowing replication of small plasmids with desired modifications and manipulation of the nuclear environment. This chapter describes the protocols needed to prepare HSS and NPE and how these extracts are used to study DNA replication.

Original languageEnglish
Title of host publicationDNA Replication
Subtitle of host publicationMethods and Protocols
EditorsSonya Vengrova, Jacob Dalgaard
Number of pages24
Publication statusPublished - 2009
Externally publishedYes

Publication series

NameMethods in Molecular Biology
ISSN (Print)1064-3745

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics


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