1887

Abstract

Three and seven strains were studied by using restriction endonuclease analysis (REA) combined with principal-component analysis (PCA) and soft independent modeling of class analogy (SIMCA). Chromosomal DNAs from the strains were extracted and cleaved with restriction enzymes, and the DNA fragments were separated according to size by agarose gel electrophoresis. Band patterns were read by using a laser densitometer. The procedure to obtain reproducible digestion patterns with a suitable number of DNA fragments was optimized. 718, I and RI were the most suitable of the 17 restriction enzymes tested, each giving 30 to 50 DNA fragments down to a molecular weight of 4.2 × 10. The digestion patterns of all three enzymes, which gave a data set for 10 strains and 80 variables, were used for classification by PCA and SIMCA. All strains were clearly separated, and the separation within each species was in general accordance with data on DNA-DNA homology found in the literature. A class model was created for 1073, 1068, 1063, 1048, and 1044. Closest to this model was DSM 20016 (T = type strain), followed by DSM 20015; the most distant strains were the strains. We concluded that restriction endonuclease analysis, combined with PCA and SIMCA, can be used for the classification of spp.

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1990-04-01
2024-03-04
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