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. 1972 Jun;110(3):917–925. doi: 10.1128/jb.110.3.917-925.1972

Deoxyribonucleic Acid-Deoxyribonucleic Acid Hybridization Assay for Replication Origin Deoxyribonucleic Acid of Escherichia coli

Peter L Kuempel 1
PMCID: PMC247510  PMID: 4555417

Abstract

Deoxyribonucleic acid (DNA)-DNA hybridization on nitrocellulose filters can be used to assay for replication origin DNA from Escherichia coli if the DNA attached to the filters is enriched for the replication origin sequences. Such DNA can be readily isolated from very rapidly growing cells. When low amounts of this DNA were attached to filters, radioactively labeled DNA from the replication origin hybridized 1.7 times as well as radioactive replication terminus DNA. Under identical conditions, radioactively labeled DNA from exponentially growing cells hybridized only 1.3 times as well as radioactive replication terminus DNA. The replication origin, replication terminus, and randomly labeled DNA hybridized with similar efficiencies to filters containing DNA isolated from cells incubated in the absence of required amino acids. This DNA appeared to have all sequences present at equal frequencies. The hybridization assay was used to demonstrate that the DNA synthesized shortly after the addition of amino acids to cells previously deprived of required amino acids was primarily from the replication origin and then rapidly became similar to DNA synthesized by exponentially growing cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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