Recombination as a requirement for segregation of a partially diploid mutant of Pneumococcus.

TitleRecombination as a requirement for segregation of a partially diploid mutant of Pneumococcus.
Publication TypeJournal Article
Year of Publication1975
AuthorsLedbetter ML, Hotchkiss RD
Date Published1975 Aug
KeywordsAcridines, Cell Division, Diploidy, Drug Resistance, Microbial, Meiosis, Mitomycins, Mutation, Nitrobenzoates, R Factors, Radiation Genetics, Recombination, Genetic, Salicylates, Streptococcus pneumoniae, Sulfonamides, Time Factors, Ultraviolet Rays

Conditions are described in which the pneumococcal mutant strain sulr-c, resistant to the drug sulfanilamide, gives rise to sensitive segregants resistant to nitrobenzoic acid at a frequency constant with time. This segregant frequency is markedly enhanced upon exposure of the cells to doses of ultraviolet light or mitomycin C that permit survival of 50% to 90% of the cells. Treatment with acridine orange diminishes the segregant frequency. From the known influences of these three agents on genetic recombination, we propose that a recombination event is necessary in the generation of segregants.--During a period of incubation following treatment with ultraviolet light or mitomycin C, cell division resumes and the original segregant frequency is restored. Thus potential segregants are either unable to replicate in the absence of selection, or they are under-represented among the cells dividing soon after treatment.--If the sulr-c mutation is introduced into a mutant pneumococcal strain lacking an ATP-dependent exonuclease activity and deficient in recombination with transforming DNA, segregant frequencies are unaffected. This fact may indicate limits upon the type of recombination event responsible for segregation.

Alternate JournalGenetics
PubMed ID271
PubMed Central IDPMC1213368

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