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. 1987 Dec;169(12):5641–5647. doi: 10.1128/jb.169.12.5641-5647.1987

Method for localization of cloned DNA fragments on the Escherichia coli chromosome.

O Fayet 1, M F Prere 1
PMCID: PMC214021  PMID: 3316190

Abstract

In exponentially growing cultures of Escherichia coli strains carrying the dnaC28 mutation, DNA replication can be synchronized by temperature changes (R. L. Rodriguez, M. S. Dalbey, and C. I. Davern, J. Mol. Biol. 74:599-604, 1973). We used this synchronization procedure and DNA-DNA hybridization to develop a technique for the localization of cloned chromosomal fragments on the genetic map. Because of the bidirectional nature of replication in E. coli, our method gave two possible positions (one on each replication arm). However because of the precision obtained for each position (+/- 1 map unit), the final mapping with various genetic techniques was greatly facilitated. Using this technique and a simple chromosomal mobilization test, we located at 93.2 +/- 1 min a cloned DNA fragment carrying an extragenic suppressor of dnaA46, a thermosensitive mutation in the dnaA initiation gene. Further analysis showed that the groES (mopA) and groEL (mopB) genes, both located at 94.2 min on the standard map, were indeed carried by the cloned suppressor fragment.

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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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