The size and degree of homogeneity of the repetitive units in purified ribosomal DNA (gamma DNA) from Saccharomyces cerevisiae have been analyzed by restriction endonuclease digestion and heteroduplex mapping. Digestion of the gamma DNA with EcoRI yields seven fragments, digestion with Hind II+III y
Restriction endonuclease analysis of chromosomal DNA fromListeria monocytogenesstrains
β Scribed by C. Casolari; B. Facinelli; U. Fabio; J. Rocourt; P. E. Varaldo
- Publisher
- Springer
- Year
- 1990
- Tongue
- English
- Weight
- 734 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0393-2990
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β¦ Synopsis
Restriction endonuclease analysis of chromosomal DNA was applied to thirteen Listeria monocytogenes strains alongside the more conventional typing methods of serotyping and phage typing. The organisms were isolated from cases of sporadic listeriosis (nine strains); from an occasional nosocomial cluster (two strains); and from food samples (two strains). Purified DNAs were digested with EcoRI restriction endonuclease, and restriction fragments separated by electrophoresis. Restriction patterns correlated well with phage patterns, but also allowed typing of the phage-untypable strains. DNA fingerprinting appears to be a potentially helpful tool for epidemiological investigations of listeric infections, particularly when phage typing fails to determine the identity or diversity of the isolates.
π SIMILAR VOLUMES
Yeast ribosomal DNA (rDNA) was digested with the restriction enzymes Hind III, Hind II and a mixture of Hind II and Hind III. The cleavage products were analyzed by electrophoresis on 1.5% agarose gels. Several distinct bands could be observed, which are derived from the redundant ribosomal transcri