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Journal of Clinical Microbiology, January 1998, p. 128-132, Vol. 36, No. 1
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Enterobacterial Repetitive Intergenic Consensus Sequences as Molecular Targets for Typing of Mycobacterium tuberculosis Strains

Leonardo A. Sechi,1,* Stefania Zanetti,1 Ilaria Dupré,1 Giovanni Delogu,1 and Giovanni Fadda2

Dipartimento di Scienze Biomediche, Sezione di Microbiologia Sperimentale e Clinica, Università degli studi di Sassari, 07100 Sassari,1 and Istituto di Microbiologia, Facoltà di Medicina e Chirurgia "Agostino Gemelli," Università Cattolica del Sacro Cuore, 00168 Rome,2 Italy

Received 27 February 1997/Returned for modification 25 June 1997/Accepted 10 October 1997

The presence of enterobacterial repetitive intergenic consensus (ERIC) sequences was demonstrated for the first time in the genome of Mycobacterium tuberculosis; these sequences have been found in transcribed regions of the chromosomes of gram-negative bacteria. In this study genetic diversity among clinical isolates of M. tuberculosis was determined by PCR with ERIC primers (ERIC-PCR). The study isolates comprised 71 clinical isolates collected from Sardinia, Italy. ERIC-PCR was able to identify 59 distinct profiles. The results obtained were compared with IS6110 and PCR-GTG fingerprinting. We found that the level of differentiation obtained by ERIC-PCR is greater than that obtained by IS6110 fingerprinting and comparable to that obtained by PCR-GTG. This method of fingerprinting is rapid and sensitive and can be applied to the study of the epidemiology of M. tuberculosis infections, especially when IS6110 fingerprinting is not of any help.

* Corresponding author. Mailing address: Dipartimento di Scienze Biomediche, Sezione di Microbiologia Sperimentale e Clinica, Università degli studi di Sassari, Viale S. Pietro 43/B, 07100 Sassari, Italy. Phone: 79 228303. Fax: 79 212345. E-mail: microb{at}ssmain.uniss.it.

Journal of Clinical Microbiology, January 1998, p. 128-132, Vol. 36, No. 1
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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