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Significance of Filter Mating in Integrative Incompatibility Test for Plasmid Classification
Author(s) -
Yoshida Takaharu,
Takahashi Isamu,
Tubahara Hikokichi,
Sasakawa Chihiro,
Yoshikawa Masanosuke
Publication year - 1984
Publication title -
microbiology and immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 70
eISSN - 1348-0421
pISSN - 0385-5600
DOI - 10.1111/j.1348-0421.1984.tb02947.x
Subject(s) - plasmid , mating , mating type , biology , filter (signal processing) , genetics , computer science , gene , computer vision
For classification of plasmids in epidemiological studies, an integrative incompatibility test using liquid mating was developed by Sasakawa et al (Plasmid 3 : 116–127, 1980). This test was designed to compare the relative mating frequency of a donor carrying a test plasmid with that of recA recipients carrying various integrated plasmids. To improve the accuracy of this method by increasing transfer frequency of a test plasmid, filter mating was introduced. A transfer frequency 10 to 30,000 times higher than that achieved by liquid mating was attained by filter mating. The degree of increase varied among the incompatibility groups and the majority of members belonging to the same incompatibility group exhibited a similar degree of increase. Standard plasmids were classified correctly with the integrative incompatibility test using filter mating. Out of 26 naturally occurring plasmids of poor transferability in liquid mating, all of domestic animal origin, 25 were correctly classified as IncH with the integrative incompatibility test using filter mating. Moreover, the method is capable of subdividing IncH plasmids directly into IncH1 and IncH2, because IncH2, but not IncH1, plasmids showed incompatibility with the integrated plasmid, R478, of the IncH2 group.