Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Comparative genomic hybridization to study capsule switching between serogroup C and W of Neisseria meningitidis strains

ABSTRACT: Changing antigenic structure such as capsule polysaccharide is a common strategy for bacterial pathogen to evade host immune system. In this regard, the recent emergence of an invasive W:2a:P1.7-2,4 ST-11 strain in New Zealand, which is an uncommon pathogenic serogroup, was investigated for its genetic origins. Molecular typing of 103 meningococcal isolates with similar serotyping characteristics was undertaken to determine genetic relationships. Results indicated that the W:2a:P1.7-2,4 strain had emerged via capsule switching from an existing group C strain (C:2a:P1.7 2,4). Neither of the upstream and downstream sites of recombination could be elucidate but sequence analysis demonstrated that at least 45 kb of DNA was involved in the recombination event. This included the entire capsule gene cluster. Genomic DNA isolated from serogroup C strains (n=4) and serogroup W strains (n=4) were compared using Pan-neisseria DNA microarray.

ORGANISM(S): Neisseria meningitidis

SUBMITTER: Ming-Shi Li

PROVIDER: E-MEXP-1910 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Evidence for capsule switching between carried and disease-causing Neisseria meningitidis strains.

Beddek Amanda J AJ Li Ming-Shi MS Kroll J Simon JS Jordan T William TW Martin Diana R DR

Infection and immunity 20090518 7

Changing antigenic structure such as with capsule polysaccharide is a common strategy for bacterial pathogens to evade a host immune system. The recent emergence of an invasive W:2a:P1.7-2,4 sequence type 11 (ST-11) strain of Neisseria meningitidis in New Zealand, an uncommon serogroup/serotype in New Zealand disease cases, was investigated for its genetic origins. Molecular typing of 107 meningococcal isolates with similar serotyping characteristics was undertaken to determine genetic relations ...[more]

PMID: 19451248

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Project description:The gene NMB0419 of Neisseria meningitidis strain MC58 encodes a putative tetratricopeptide repeats (TPR) containing protein, which was implicated in respiratory epithelial invasion. We have accordingly sought a role for NMB0419 in meningococcal adherence and invasion of human epithelial cells using Escherichia coli surrogates. In trans expression of NMB0419 promoted adherence of the E. coli strain to human epithelial cells, which showed a unique aggregative adherence pattern that was observed for pathogenic E. coli. This adherence was totally abolished by addition of D-mannose, suggesting that formation of type 1 pili on the surface of E. coli strain was solely responsible for the adherence and was facilitated by the expression of NMB0419. This was further supported by rigid pilus structures seen on the surface of NMB0419 expressing E. coli using electron microscopy. A survey of other meningococcal strains including serogroup A, B, C, W, X, Y and Z (n=3, 42, 10, 1, 1, 1, and 1, respectively) revealed that an NMB0419 homologue was present in all strains, however, encoded varying number of TPR domains from 1 to 7. E. coli with in trans expression of such a homologue (NMA2065) encoding single TPR domain also showed enhanced adherence to the level that was observed for the E. coli strain expressing NMB0419 encoding for 4 TPR domains. Nevertheless, in-frame deletion of the TPR-domain coding sequence from the expression plasmid construct reduced the E. coli adherence to the background level. Revisit of the NMB0419 mutant strain of meningococcus indicated that reduction in adherence was primarily responsible for the reduced epithelial invasion that was previously observed. Study of transcriptome profiles in E. coli using microarray showed that the most significantly up-regulated genes in NMB0419 expressing E. coli belonging to the fim operon encoding all necessary structure proteins and chaperons for type 1 pili, strongly suggesting a gene regulatory role for NMB0419. Although the mechanism yet to be explored, this is the first study to showed that TPR domains are involved in bacterial adherence and that a gene encoding single functional TPR domain produced the same phenotype as a homologue encoding multiple TPR domains did.

Dataset Information

Comparative genomic hybridization to study capsule switching between serogroup C and W of Neisseria meningitidis strains

Publications

Evidence for capsule switching between carried and disease-causing Neisseria meningitidis strains.

Similar Datasets

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