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Infection and Immunity, March 2001, p. 1816-1820, Vol. 69, No. 3
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.3.1816-1820.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

NmeSI Restriction-Modification System Identified by Representational Difference Analysis of a Hypervirulent Neisseria meningitidis Strain

Aldert Bart,^1,* Yvonne Pannekoek,¹ Jacob Dankert,^1,2 and Arie van der Ende¹

Department of Medical Microbiology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam,¹ and Reference Laboratory for Bacterial Meningitis, University of Amsterdam/RIVM, 1100 DE Amsterdam,² The Netherlands

Received 16 August 2000/Returned for modification 21 September 2000/Accepted 28 November 2000

Neisseria meningitidis is a gram-negative bacterium that may cause meningitis, sepsis, or both. The increase in the incidence of meningococcal disease in various countries in the past 2 decades is mainly due the genotypically related lineage III meningococci. The chromosomal DNA differences between lineage III strains and non-lineage III strains were identified using representational difference analysis. Thus, a 1.8-kb locus that is specific for lineage III meningococci was identified. The locus contains three open reading frames encoding the NmeSI restriction-modification system. The methyltransferase gene was cloned and expressed in Escherichia coli. Site AGTACT was found to be modified by the enzyme. In conclusion, lineage III strains differ from endemic strains by the presence of a specific restriction-modification system. This restriction-modification system may contribute to the clonal and hypervirulent character of lineage III strains by influencing horizontal gene transfer and transcription.

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^* Corresponding author. Mailing address: Department of Medical Microbiology, Academic Medical Center, University of Amsterdam, P.O. Box 22660, 1105 AZ Amsterdam, The Netherlands. Phone: 31-20-5664863. Fax: 31-20-6979271. E-mail: A.Bart{at}AMC.UVA.NL.

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Infection and Immunity, March 2001, p. 1816-1820, Vol. 69, No. 3
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.3.1816-1820.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

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