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Science 19 September 1980:
Vol. 209. no. 4463, pp. 1370 - 1374
DOI: 10.1126/science.6251543
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Articles

Science, Vol 209, Issue 4463, 1370-1374
Copyright © 1980 by American Association for the Advancement of Science

articles

Phase variation: evolution of a controlling element

M Simon, J Zieg, M Silverman, G Mandel, and R Doolittle

Phase variation in bacteria is regulated by homologous recombination at a specific DNA site. This recombinational event causes the inversion of a 970-base-pair DNA sequence that includes the promoter necessary for transcription of a flagellar gene. The invertible segment is flanked by two sites that are necessary for the inversion and contains a gene (hin) whose product mediates the inversion event. The hin gene shows extensive homology with the TnpR gene carried on the Tn3 transposon. It is also homologous with the gin gene carried on bacteriophage mu. These relationships suggest that the phase variation system may have evolved by the association of a transposon with a resident gene and the subsequent specialization of these elements to regulate flagellar antigen expression.


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