ArticleBMC microbiology2010
Prevalence of genetic differences in phosphorylcholine expression between nontypeable Haemophilus influenzae and Haemophilus haemolyticus.
Article in BMC microbiology, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
15 citing papers in PubMed, 16 citations in OpenAlex.
- Mucosal immune cell priming by intranasally deliveredFrontiers in immunology · 2026Article
- A sweeping view of avian mycoplasmas biology drawn from comparative genomic analyses.BMC genomics · 2025Article
- Analysis of Bacterial Phosphorylcholine-Related Genes Reveals an Association between Type-Specific Biosynthesis Pathways and Biomolecules Targeted for Phosphorylcholine Modification.Microbiology spectrum · 2023Article
- The biosynthesis and role of phosphorylcholine in pathogenic and nonpathogenic bacteria.Trends in microbiology · 2023Review
- Fully integrating pathophysiological insights in COPD: an updated working disease model to broaden therapeutic vision.European respiratory review : an official journal of the European Respiratory Society · 2021Review
- Comparative Analyses of the Lipooligosaccharides from Nontypeable Haemophilus influenzae and Haemophilus haemolyticus Show Differences in Sialic Acid and Phosphorylcholine Modifications.Infection and immunity · 2016Article
- Haemophilus haemolyticus Interaction with Host Cells Is Different to Nontypeable Haemophilus influenzae and Prevents NTHi Association with Epithelial Cells.Frontiers in cellular and infection microbiology · 2016Article
- An antagonist of the platelet-activating factor receptor inhibits adherence of both nontypeable Haemophilus influenzae and Streptococcus pneumoniae to cultured human bronchial epithelial cells exposed to cigarette smoke.International journal of chronic obstructive pulmonary disease · 2016Article
- Complete Deletion of the Fucose Operon in Haemophilus influenzae Is Associated with a Cluster in Multilocus Sequence Analysis-Based Phylogenetic Group II Related to Haemophilus haemolyticus: Implications for Identification and Typing.Journal of clinical microbiology · 2015Article
- Predicted configurations of oligosaccharide extensions in the lipooligosaccharide of nontypeable Haemophilus influenzae isolates.Journal of clinical microbiology · 2014Article
- Molecular tools for differentiation of non-typeable Haemophilus influenzae from Haemophilus haemolyticus.Frontiers in microbiology · 2014Review
- Article
- Haemophilus parainfluenzae has a limited core lipopolysaccharide repertoire with no phase variation.Glycoconjugate journal · 2013Article
- Microbial modulation of host immunity with the small molecule phosphorylcholine.Infection and immunity · 2013Review
- Genome sequence of duck pathogen Mycoplasma anatis strain 1340.Journal of bacteriology · 2011Article
Corrections and comments
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
Abstract
backgroundAlthough non-typeable (NT) Haemophilus influenzae and Haemophilus haemolyticus are closely related human commensals, H. haemolyticus is non-pathogenic while NT H. influenzae is an important cause of respiratory tract infections. Phase-variable phosphorylcholine (ChoP) modification of lipooligosaccharide (LOS) is a NT H. influenzae virulence factor that, paradoxically, may also promote complement activation by binding C-reactive protein (CRP). CRP is known to bind more to ChoP positioned distally than proximally in LOS, and the position of ChoP within LOS is dictated by specific licD alleles (designated here as licDI, licDIII, and licDIV) that are present in a lic1 locus. The lic1 locus contains the licA-licD genes, and ChoP-host interactions may also be influenced by a second lic1 locus that allows for dual ChoP substitutions in the same strain, or by the number of licA gene tetranucleotide repeats (5'-CAAT-3') that reflect phase-variation mutation rates.
resultsUsing dot-blot hybridization, 92% of 88 NT H. influenzae and 42.6% of 109 H. haemolyticus strains possessed a lic1 locus. Eight percent of NT H. influenzae and none of the H. haemolyticus strains possessed dual copies of lic1. The licDIII and licDIV gene alleles were distributed similarly (18-22%) among the NT H. influenzae and H. haemolyticus strains while licDI alleles were present in 45.5% of NT H. influenzae but in less than 1% of H. haemolyticus strains (P < .0001). NT H. influenzae had an average of 26.8 tetranucleotide repeats in licA compared to 14.8 repeats in H. haemolyticus (P < .05). In addition, NT H. influenzae strains that possessed a licDIII allele had increased numbers of repeats compared to NT H. influenzae with other licD alleles (P < .05).
conclusionsThese data demonstrate that genetic similarities and differences of ChoP expression exist between NT H. influenzae and H. haemolyticus and strengthen the hypothesis that, at the population level, these differences may, in part, provide an advantage in the virulence of NT H. influenzae.
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