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. 1995 Apr;63(4):1484–1490. doi: 10.1128/iai.63.4.1484-1490.1995

Analysis of Neisseria meningitidis class 3 outer membrane protein gene variable regions and type identification using genetic techniques.

M C Bash 1, K B Lesiak 1, S D Banks 1, C E Frasch 1
PMCID: PMC173179  PMID: 7890414

Abstract

The class 3 porin proteins of Neisseria meningitidis stimulate bactericidal antibodies and express serotype-specific antigenic epitopes. Sequence analysis of porB genes for the class 3 proteins revealed regions of variability that map to surface-exposed loops. To evaluate the relationship between serotype and variable-region (VR) genotype, sequences from the 11 class 3-expressing serotype strains and 3 additional serotype 4 strains were analyzed by molecular techniques. Multiple-sequence alignment revealed a limited number of unique sequences at each of four VRs (VR1 to VR4), ranging from four unique sequences at VR1 to seven sequence patterns at VR2 and VR4. Serotype-specific VR sequences were found in each of the four VRs, suggesting that each VR has immunologic importance. Five serotypes had at least one VR sequence that was unique. Three serotypes which had sequences in common with other serotypes at each VR were distinguished by examining multiple VRs. Serotype 3 was identical to serotype 19 at each VR, and serotype 8 was identical to serotype 18 at each VR. Serotypes 4 and 21 were identical at VR1 and significantly different at VR3 and VR4. A subpopulation of serotype 4 strains with a unique VR2 sequence was identified. The serotypes which were grouped with closely related or identical sequences at one VR were grouped with different serotypes at other VRs consistent with the pattern of genetic mosaicism described for the porA (class 1 protein) gene. Hybridization assays demonstrated the ability to identify VR genotypes and distinguish serotypes using biotin-labelled oligonucleotide probes. This information may be useful in strain selection for vaccine development, in epidemiologic studies to determine the prevalence of the individual VR genotype (especially among nonserotypeable strains) and, combined with PCR, in the identification of culture-negative suspected meningococcal cases.

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Selected References

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