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. 1990 May 25;18(10):2961–2966. doi: 10.1093/nar/18.10.2961

Ordered deletions for DNA sequencing and in vitro mutagenesis by polymerase extension and exonuclease III gapping of circular templates.

S Henikoff 1
PMCID: PMC330825  PMID: 2190184

Abstract

A simple method is described for generating nested deletions from any fixed point in a cloned inset. Starting with a single-stranded phagemid template, T4 DNA polymerase is used to extend an annealed primer. This leads to a fully double-stranded circular molecule with a nick or small gap just 5' to the primer. Exonuclease III initiates progressive digestion from the resulting 3' end. Removal of timed aliquots and digestion with a single-strand specific endonuclease leads to a series of linear nested fragments having a common end corresponding to the 5' end of the primer. These molecules are circularized and used to transform cells, providing large numbers of deletion clones with targeted breakpoints. The 6-step procedure involves successive additions to tubes, beginning with a single-stranded template and ending with transformation; no extractions, precipitations or centrifugations are needed. Results are comparable to those obtained with standard Exonuclease III-generated deletion protocols, but there is no requirement for restriction endonuclease digestion or for highly purified double-stranded DNA starting material. This procedure provides a strategy for obtaining nested deletions in either direction both for DNA sequencing and for functional analysis.

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Selected References

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