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Maintenance and genetic stability of vector plasmids pBR322 and pBR325 in Escherichia coli K12 strains grown in a chemostat

✍ Scribed by Noack, Dieter ;Roth, Martin ;Geuther, Rudolf ;Müller, Gerhard ;Undisz, Katrin ;Hoffmeier, Christine ;Gáspár, Sandor

Publisher: Springer
Year: 1981
Tongue: English
Weight: 411 KB
Volume: 184
Category: Article
ISSN: 0026-8925
DOI: 10.1007/bf00271207

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✦ Synopsis

The maintenance and genetic stability of the vector plasmids pBR322 and pBR325 in two genetically different Escherichia coli hosts were studied during chemostat cultivation with glucose and ammonium chloride limitation and at two different dilution rates. The plasmid pBR322 was stably maintained under all growth conditions tested. However pBR325 segregated from both hosts preferentially during glucose limitation and at low dilution rate. In addition to this general segregation process a separate loss of tetracycline resistance was observed. The remaining plasmid conferred resistance to ampicillin and chloramphenicol only, without any remarkable alteration of its molecular weight. Cultivation conditions in the chemostat were found that allowed the stable genetic inheritance of both plasmids in the hosts studied.

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