Genetical Distinction of R Factors Derived from Shigellae and Salmonellae

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  • YOSHIKAWA Masanosuke
    Department of Bacterial Infection and Central Clinical Laboratory, The Institute of Medical Science, University of Tokyo
  • NAGASHIMA Shigeaki
    Department of Bacterial Infection and Central Clinical Laboratory, The Institute of Medical Science, University of Tokyo
  • MATSUSHIMA Shingo
    Department of Bacterial Infection and Central Clinical Laboratory, The Institute of Medical Science, University of Tokyo

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Comparison of R factors derived from shigellae and salmonellae was made using several genetical characteristics. Almost all R factors derived from shigellae were fi+ (fertility inhibition), spp- (no restriction against phage λ vir) and possessed a drug resistance pattern of (sul, str, cmd, tet), whereas those from salmonellae were fi-, spp-and their resistance patterns were (str), (tet) or (str, tet). The (str, tet) R factors often segregated upon conjugal transfer but R factors from shigellae did not. R factors from shigellae were unstable in Salmonella but stable in Shigella and Escherichia coli. R factors derived from salmonellae were unstable in Shigella but stable in Salmonella and E. coli. All fi+, spp- R factors derived from shigellae, except two which had been known to be exceptional also in the incompatibility tests, conferred atabrine sensitivity (ats+) upon the host cells, whereas all fi-, spp- R factors derived from shigellae were ats-. One exceptional fi-, spp- R factor derived from Shigella was ats-, but all of the fi-, spp- R factors derived from salmonellae were ats+. Two representative R factors derived from salmonellae were shown to be compatible with 14 fi+ and fi- standard R factors which were derived from shigellae and had been stocked in 3 laboratories in Japan as representative collections. Five (tet) segregants originally derived from (sul, str, cml, tet) R factors of shigellae but obtained by transferring to and segregating in Salmonella Panama were shown to be different from (tet) R factors of Salmonella origin with respect to the fi character and the incompatibility tests. From these results it was concluded that R factors of Shigella origin and those of Salmonella are different.

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