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Title: Typing of Clostridium difficile strains by PCR-amplification of variable length 16S-23S rDNA spacer regions.
Austin Authors: Gürtler, V
Affiliation: Department of Microbiology, Heidelberg Repatriation Hospital, Australia
Issue Date: 1-Dec-1993
Publication information: Journal of General Microbiology; 139(12): 3089-97
Abstract: To develop a rapid and accurate method of typing large numbers of clinical isolates of Clostridium difficile, four regions of the rRNA operon [A, 15-1407 and B, 907-1407 (16S-16S); C, 1392-507 and D, 907-507 (16S-23S)] were enzymically amplified from 24 strains. When region A was hybridized to HindIII-digested genomic DNA isolated from C. difficile strains, all of the variable length restriction fragments hybridized. When region B was hybridized to HindIII-digested genomic DNA isolated from C. difficile strains, a set of variable length restriction fragments (Group II) hybridized predominantly. When region C was separated by agarose gel electrophoresis, a series of products ranging in size from approximately 800-1300 bp was obtained. When regions C and D were digested with HindIII, a constant region of 430 bp was found in both products and in all strains. From the above experiments it was concluded that the variable length Group II restriction fragments and the variable length region C amplification products were due to variable length 16S-23S spacer regions between alleles of the one strain. When region C amplification products were separated by denaturing PAGE, 16 variable length rRNA alleles (rrnA-P) were demonstrated from 24 C. difficile strains ranging in size from 852-1210 bp. After analysis with maximum parsimony, the 24 strains were divided into 14 ribotypes.(ABSTRACT TRUNCATED AT 250 WORDS)
Gov't Doc #: 7510324
Journal: Journal of general microbiology
Type: Journal Article
Subjects: Bacterial Typing Techniques
Base Sequence
Clostridium difficile.classification.genetics.isolation & purification
DNA Primers.genetics
DNA, Bacterial.genetics
DNA, Ribosomal.genetics
Genetic Variation
Molecular Sequence Data
Polymerase Chain Reaction.methods
RNA, Bacterial.genetics
RNA, Ribosomal, 16S.genetics
RNA, Ribosomal, 23S.genetics
Appears in Collections:Journal articles

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