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Journal of Clinical Microbiology, July 2004, p. 2913-2918, Vol. 42, No. 7
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.7.2913-2918.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

High-Throughput Method for Detecting Genomic-Deletion Polymorphisms

Yves-Olivier Luc Goguet de la Salmonière,1* C. C. Kim,2 A. G. Tsolaki,1 A. S. Pym,1 M. S. Siegrist,1 and Peter M. Small1

Division of Infectious Diseases and Geographic Medicine, Department of Medicine,1 Department of Microbiology and Immunology, Stanford University Medical Center, Stanford, California2

Received 13 October 2003/ Returned for modification 18 February 2004/ Accepted 11 April 2004

DNA microarrays have been successfully used with different microorganisms, including Mycobacterium tuberculosis, to detect genomic deletions relative to a reference strain. However, the cost and complexity of the microarray system are obstacles to its widespread use in large-scale studies. In order to evaluate the extent and role of large sequence polymorphisms (LSPs) or insertion-deletion events in bacterial populations, we developed a technique, termed deligotyping, which hybridizes multiplex-PCR products to membrane-bound, highly specific oligonucleotide probes. The approach has the benefits of being low cost and capable of simultaneously interrogating more than 40 bacterial strains for the presence of 43 genomic regions. The deletions represented on the membrane were selected from previous comparative genomic studies and ongoing microarray experiments. Highly specific probes for these deletions were designed and attached to a membrane for hybridization with strain-derived targets. The targets were generated by multiplex PCR, allowing simultaneous amplifications of 43 different genomic loci in a single reaction. To validate our approach, 100 strains that had been analyzed with a high-density microarray were analyzed. The membrane accurately detected the deletions identified by the microarray approach, with a sensitivity of 99.9% and a specificity of 98.0%. The deligotyping technique allows the rapid and reliable screening of large numbers of M. tuberculosis isolates for LSPs. This technique can be used to provide insights into the epidemiology, genomic evolution, and population structure of M. tuberculosis and can be adapted for the study of other organisms.

* Corresponding author. Present address: Unité d'Hygiène et Prévention de l'Infection, Hôpital Henri Mondor, Assistance Publique-Hôpitaux de Paris, Université Paris-12, 51 Avenue Maréchal de Lattre de Tassigny, 94010 Créteil, France. Phone: (33) 1 49 81 45 95. Fax: (33) 1 49 81 45 98. E-mail: ygoguet{at}pasteur.fr.

Journal of Clinical Microbiology, July 2004, p. 2913-2918, Vol. 42, No. 7
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.7.2913-2918.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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