Epidemiological evidence for the role of the hemoglobin receptor, hmbR, in meningococcal virulence.

Harrison, Odile B; Evans, Nicholas J; Blair, Jessica M; Grimes, Holly S; Tinsley, Colin R; Nassif, Xavier; Kriz, Paula; Ure, Roisin et al. · J Infect Dis · 2009

other · Level V

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Abstract

The distribution of the hemoglobin receptor gene (hmbR) was investigated among disease and carriage Neisseria meningitidis isolates, revealing that the gene was detected at a significantly higher frequency among disease isolates than among carriage isolates. In isolates without hmbR, the locus was occupied by the cassettes exl2 or exl3 or by a "pseudo hmbR" gene, designated exl4. The hmbR locus exhibited characteristics of a pathogenicity island in published genomes of N. meningitidis, Neisseria gonorrhoeae, and Neisseria lactamica sequence type-640. These data are consistent with a role for the hmbR gene in meningococcal disease.

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