NDLI: Conservation of Restriction Sites in Isolates of Streptococcus pneumoniae with Diverse Restriction Fragment Patterns

Content Provider	PubMed Central
Author	Hall, Lucinda M. C. Duke, Brigid
Copyright Year	1998
Abstract	Separation of large restriction fragments by pulsed-field gel electrophoresis is a commonly used method for epidemiological typing of Streptococcus pneumoniae and many other bacterial species. Information on the genetic changes underlying the restriction fragment polymorphisms that allow discrimination between isolates is scarce. In this study fragments adjacent to ApaI sites in a clinical isolate of S. pneumoniae were cloned and used to probe HindIII and HindIII-plus-ApaI genomic DNA digests from other isolates with very different ApaI fragment patterns. If for a given isolate the HindIII fragment detected by the probe was reduced in size on digestion with ApaI, it was deduced that the ApaI site was conserved in that isolate. The results demonstrate that of six ApaI sites in PN93/908 examined, five were retained in 11 genetically different isolates and one was retained in 2 isolates but lost in 9 others. It was concluded that point mutations at restriction sites are unlikely to account for the restriction fragment length polymorphism observed and that much of the polymorphism may be due to DNA rearrangements, possibly resulting from the insertion or deletion of mobile DNA elements.
Starting Page	1805
File Format	PDF
ISSN	1098660X
e-ISSN	1098660X
Journal	Journal of Clinical Microbiology
Issue Number	6
Volume Number	36
Language	English
Publisher	American Society for Microbiology
Publisher Date	1998-06-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Microbiology (medical)

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