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<span style = 'font-size: large'> '''Foster, TJ''' (1977) Insertion of the tetracycline resistance translocation unit Tn10 in the lac operon of Escherichia coli K12.''Mol. Gen. Genet.'' '''154''':305-9</span> | |||
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|{{TableHeadingColor}} |'''Abstract''' || <protect>The majority of TN10 insertions in the lacZ gene of Escherichia coli occurred in a small region of the promoter distal part of the gene. The resulting mutations were polar on lacY and reverted to Lac+ at a frequency of 10(-8). None of the revertants were Tcr. Furthermore Lac+ Tcr revertants could not be selected directly. Relief of polarity revertants of the lacZ::Tn10 mutants were formed at a frequency of 10(-5) - 10(-4). Most resulted from a deletion event internal to the transposon which removed the Tcr genes and the putative transcription terminator. It is postulated that a fragment of Tn10 remains at the original insertion point to cause a revertible Lac- mutation.</protect> | |||
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|{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=337110 PubMed]<br/> | |||
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Revision as of 11:49, 12 September 2008
Foster, TJ (1977) Insertion of the tetracycline resistance translocation unit Tn10 in the lac operon of Escherichia coli K12.Mol. Gen. Genet. 154:305-9
| Abstract | The majority of TN10 insertions in the lacZ gene of Escherichia coli occurred in a small region of the promoter distal part of the gene. The resulting mutations were polar on lacY and reverted to Lac+ at a frequency of 10(-8). None of the revertants were Tcr. Furthermore Lac+ Tcr revertants could not be selected directly. Relief of polarity revertants of the lacZ::Tn10 mutants were formed at a frequency of 10(-5) - 10(-4). Most resulted from a deletion event internal to the transposon which removed the Tcr genes and the putative transcription terminator. It is postulated that a fragment of Tn10 remains at the original insertion point to cause a revertible Lac- mutation. |
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