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. 1994 Apr;176(7):2114–2120. doi: 10.1128/jb.176.7.2114-2120.1994

Transposition of IS2 into the hemB gene of Escherichia coli K-12.

L A Lewis 1, D Lewis 1, V Persaud 1, S Gopaul 1, B Turner 1
PMCID: PMC205321  PMID: 8144481

Abstract

Genetic studies of the hemB gene in Escherichia coli have resulted in the recovery of both stable and unstable mutant strains. The stable strains have been shown to result from large deletions. This study demonstrates that unstable strains result from the insertion of transposable element IS2 primarily into the 5' region of the structural gene; the instability results from precise excision of the element, producing strains with both high and low frequencies of reversion. This first report of IS2 insertion into hemB suggests that this gene may be a preferred target for insertion of this transposable element.

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Selected References

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