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[Formation of F'-episomes in Flexner shigellae]. 1976

T A Lycheva, and V G Petrovskaia

Genetic characteristics of Shigella flexneri virulent donor strain 3s, isolated in the laboratory, are studied. The data obtained showed that Sh. flexneri 3s 6832 is of F'protype it did not transmit even closely located chromosome markers, except pro+. The transition of pro+ marker was reproduced in recA- strain. F'pro plasmid was eliminated with a frequency similar to that of F'lac factor in the control strain of Escherichia coli. The study of virulence by means of keratoconjunktival test revealed its retaining in clones which lost F'pro plasmid. Probably, KCP-A gene retained in the chromosome of F'pro strain. Crossing with proA- and procC- C. coli strains revealed a small length of F'pro episome, enly ProA+ hybrids being obtained. A complex mechanism of F'system formation in interspecies genetic recombination between E. coli K-12 and Sh. flexneri 3s is demonstrated.

UI MeSH Term Description Entries
D007637 Keratoconjunctivitis Simultaneous inflammation of the cornea and conjunctiva. Keratoconjunctivitides
D010957 Plasmids Extrachromosomal, usually CIRCULAR DNA molecules that are self-replicating and transferable from one organism to another. They are found in a variety of bacterial, archaeal, fungal, algal, and plant species. They are used in GENETIC ENGINEERING as CLONING VECTORS. Episomes,Episome,Plasmid
D011995 Recombination, Genetic Production of new arrangements of DNA by various mechanisms such as assortment and segregation, CROSSING OVER; GENE CONVERSION; GENETIC TRANSFORMATION; GENETIC CONJUGATION; GENETIC TRANSDUCTION; or mixed infection of viruses. Genetic Recombination,Recombination,Genetic Recombinations,Recombinations,Recombinations, Genetic
D005111 Extrachromosomal Inheritance Vertical transmission of hereditary characters by DNA from cytoplasmic organelles such as MITOCHONDRIA; CHLOROPLASTS; and PLASTIDS, or from PLASMIDS or viral episomal DNA. Cytoplasmic Inheritance,Extranuclear Inheritance,Inheritance, Cytoplasmic,Inheritance, Extrachromosomal,Inheritance, Extranuclear
D012763 Shigella flexneri A bacterium which is one of the etiologic agents of bacillary dysentery (DYSENTERY, BACILLARY) and sometimes of infantile gastroenteritis.
D014774 Virulence The degree of pathogenicity within a group or species of microorganisms or viruses as indicated by case fatality rates and/or the ability of the organism to invade the tissues of the host. The pathogenic capacity of an organism is determined by its VIRULENCE FACTORS. Pathogenicity

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