1887

Abstract

Contour-clamped homogeneous electric field pulsed-field gel electrophoresis (PFGE) was used in combination with Southern hybridization to construct a genomic restriction map for the pathogen serotype b, strain Eagan. Sites for four restriction endonucleases, I, I, II and I, were located on the 2100 kbp circular chromosome. Twelve potential virulence loci have been placed on the map together with certain loci essential for growth of the bacteria (e.g. ribosomal RNA operons). PFGE also provided a valuable tool for characterizing ten capsulated, type b isolates (other than Eagan) known to be genetically heterogeneous and two laboratory-derived variants (transformants) derived through complex recombinational events involving random uptake of high-molecular-mass donor genomic DNA.

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1990-12-01
2021-10-27
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