G W Zhang1, M Kotiw, G Daggard. 1. Department of Biological and Physical Sciences, Faculty of Sciences, University of Southern Queensland, Toowoomba, Australia.
Abstract
AIMS: The purpose of this study was to determine if DNA polymorphisms generated by RAPD-PCR could be used to characterize Group B streptococci (GBS) for epidemiological purposes. METHODS AND RESULTS: 30 unrelated, previously serotyped strains were analysed by RAPD-PCR using two 10-mer primers (5' TGCGAGAGTC 3' and 5' AGAGGGCACA 3'). Both primers generated DNA electropherotype patterns which, on analysis, clustered the isolates within their respective serotypes. A blind test of a further 3 field isolates also defined these strains within their subsequently determined serotypes. The detection of DNA polymorphisms between isolates within a serotype confirmed previous reports of the heterogenous nature of individual GBS serotypes. CONCLUSIONS: The RAPD-PCR is a potentially useful assay for the rapid characterization of neonatal infections associated with group B streptococci. The method appears to be more discriminatory than conventional serological assays. SIGNIFICANCE AND IMPACT OF THE STUDY: The RAPD-PCR assay is faster, more convenient and easier to perform than alternative DNA analytical procedures such as Pulsfield Gel Electrophoresis. We were able to reproduce the same results following re-testing of all isolates some 12 months later which suggests that the assay may be robust enough for use in routine epidemiological investigations.
AIMS: The purpose of this study was to determine if DNA polymorphisms generated by RAPD-PCR could be used to characterize Group B streptococci (GBS) for epidemiological purposes. METHODS AND RESULTS: 30 unrelated, previously serotyped strains were analysed by RAPD-PCR using two 10-mer primers (5' TGCGAGAGTC 3' and 5' AGAGGGCACA 3'). Both primers generated DNA electropherotype patterns which, on analysis, clustered the isolates within their respective serotypes. A blind test of a further 3 field isolates also defined these strains within their subsequently determined serotypes. The detection of DNA polymorphisms between isolates within a serotype confirmed previous reports of the heterogenous nature of individual GBS serotypes. CONCLUSIONS: The RAPD-PCR is a potentially useful assay for the rapid characterization of neonatal infections associated with group B streptococci. The method appears to be more discriminatory than conventional serological assays. SIGNIFICANCE AND IMPACT OF THE STUDY: The RAPD-PCR assay is faster, more convenient and easier to perform than alternative DNA analytical procedures such as Pulsfield Gel Electrophoresis. We were able to reproduce the same results following re-testing of all isolates some 12 months later which suggests that the assay may be robust enough for use in routine epidemiological investigations.
Authors: Antoine Hannoun; Marwa Shehab; Marie-Therese Khairallah; Ahmad Sabra; Roland Abi-Rached; Tony Bazi; Khalid A Yunis; George F Araj; Ghassan M Matar Journal: Int J Microbiol Date: 2010-02-02
Authors: Maria C L G Santos; P Suzanne Hart; Mukundhan Ramaswami; Cláudia M Kanno; Thomas C Hart; Sergio R P Line Journal: Head Face Med Date: 2007-01-31 Impact factor: 2.151