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J Clin Microbiol. 1987 August; 25(8): 1511-1515

Isolation and analysis of restriction endonuclease digestive patterns of chromosomal DNA from Mycobacterium paratuberculosis and other Mycobacterium species.

ABSTRACT

A relatively rapid and efficient method for the extraction of chromosomal DNA from Mycobacterium paratuberculosis and other mycobacteria was developed. Approximately 25 to 50 micrograms of DNA could be extracted from 100 mg (wet weight) of cells, which was sufficient to perform several restriction endonuclease analyses from a single preparation. The DNA from five Mycobacterium species, including four strains of M. paratuberculosis and four strains of M. avium, was analyzed by this method. Digestion with the restriction endonucleases BstEII and PstI yielded the most definitive restriction patterns. For some strains, the restriction endonuclease analysis results were in agreement with the current identification of these organisms. The two strains of M. avium serotype 2 had identical fragment patterns. Similarly, the two strains of M. avium complex serotype 6 had identical fragment patterns. The three mycobactin-dependent M. paratuberculosis strains were very similar, whereas the mycobactin-independent M. paratuberculosis strain was more similar to the M. avium serotype 2 strains. Although many more cultures would need to be evaluated to determine correct groupings, the results of this study demonstrated the potential of restriction enzyme analysis for the differentiation of slowly growing mycobacteria.

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