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. 1985 Apr;5(4):721–727. doi: 10.1128/mcb.5.4.721

Cloning of nascent monkey DNA synthesized early in the cell cycle.

G Kaufmann, M Zannis-Hadjopoulos, R G Martin
PMCID: PMC366775  PMID: 3990692

Abstract

To study the structure and complexity of animal cell replication origins, we have isolated and cloned nascent DNA from the onset of S phase as follows: African green monkey kidney cells arrested in G1 phase were serum stimulated in the presence of the DNA replication inhibitor aphidicolin. After 18 h, the drug was removed, and DNA synthesis was allowed to proceed in vivo for 1 min. Nuclei were then prepared, and DNA synthesis was briefly continued in the presence of Hg-dCTP. The mercury-labeled nascent DNA was purified in double-stranded form by extrusion (M. Zannis-Hadjopoulos, M. Perisco, and R. G. Martin, Cell 27:155-163, 1981) followed by sulfhydryl-agarose affinity chromatography. Purified nascent DNA (ca. 500 to 2,000 base pairs) was treated with mung bean nuclease to remove single-stranded ends and inserted into the NruI site of plasmid pBR322. The cloned fragments were examined for their time of replication by hybridization to cellular DNA fractions synthesized at various intervals of the S phase. Among five clones examined, four hybridized preferentially with early replicating fractions.

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Selected References

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