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. 1982 Oct 25;10(20):6475–6485. doi: 10.1093/nar/10.20.6475

Directed mutagenesis of DNA cloned in filamentous phage: influence of hemimethylated GATC sites on marker recovery from restriction fragments.

W Kramer, K Schughart, H J Fritz
PMCID: PMC326937  PMID: 6294606

Abstract

Gapped duplex DNA molecules of recombinant genomes of filamentous phage are constructed in vitro. Denatured restriction fragments covering (part of) the precisely constructed gap are hybridized to the gapped duplex DNA molecules to form ternary duplices. The two strands of the ternary duplex molecules carry different genetic markers within the region spanned by the restriction fragment leading to a one base pair mismatch or to an insertion loop of 93 nucleotides, respectively. The two strands also vary with respect to A-methylation in GATC sites. In cases of asymmetrical methylation, transfection of E. coli with these heteroduplex molecules leads to marker recoveries with a pronounced bias in favour of the marker encoded by the methylated strand. This effect at least partly explains the comparably low marker yields achieved in previous directed mutagenesis experiments using filamentous phage as the vector. The results suggest how these procedures can be optimized. Precise construction of a 93 bp insertion of 9.5% marker yield is described.

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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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