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. 1984 Jan;81(2):512–516. doi: 10.1073/pnas.81.2.512

Structural intermediates of deletion mutagenesis: a role for palindromic DNA.

B W Glickman, L S Ripley
PMCID: PMC344708  PMID: 6582506

Abstract

A model is presented for deletion mutations whose formation is mediated by palindromic and quasipalindromic DNA sequences. It proposes that the self-complementarity of palindromes allows the formation of DNA secondary structures that serve as deletion intermediates. The structures juxtapose the end points of the deletion and thus direct deletion specificity. While misaligned DNA intermediates that explain deletion termini occurring in repeated DNA sequences have been described, no explanations have been offered for deletion termini occurring in other sequences. The DNA secondary structures whose formation is mediated by palindromic sequences appear to explain many of these. In this paper, secondary-structure intermediates are described for a series of spontaneous deletions of known sequence in the lacl gene of Escherichia coli. The model is supported by its failure to predict structures that can juxtapose simulated deletion termini in the lacl gene. We have found a strong association between palindromic sequences and repeated sequences at lacl deletion termini that suggests the joint participation of repeated and palindromic DNA sequences in the formation of some deletions. Sequences of deletions in other organisms also suggest the participation of palindromic DNA sequences in the formation of deletions.

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Selected References

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