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The Oral Commensal Streptococcus mitis Shows a Mixed Memory Th Cell Signature That Is Similar to and Cross-Reactive with Streptococcus pneumoniae 
Engen, Stian André; Rukke, Håkon Valen; Becattini, Simone; Jarrossay, David; Blix, Inger Johanne S.; Petersen, Fernanda Cristina; Sallusto, Federica; Schenck, Karl (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
Background Carriage of and infection with Streptococcus pneumoniae is known to predominantly induce T helper 17 (Th17) responses in humans, but the types of Th cells showing reactivity towards commensal streptococci with ...
Extracellular Identification of a Processed Type II ComR/ComS Pheromone of Streptococcus mutans 
Khan, Rabia; Rukke, Håkon Valen; Filho, Antonio Pedro Ricomini; Fimland, Gunnar; Arntzen, Magnus; Thiede, Bernd; Petersen, Fernanda Cristina (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
The competence-stimulating peptide (CSP) and the sigX-inducing peptide (XIP) are known to induce Streptococcus mutans competence for genetic transformation. For both pheromones, direct identification of the native peptides ...
Natural transformation of oral streptococci by use of synthetic pheromones 
Salvadori, Gabriela; Junges, Roger; Khan, Rabia; Åmdal, Heidi Aarø; Morrison, Donald A.; Petersen, Fernanda Cristina (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
The discovery that Streptococcus pneumoniae uses a competence-stimulating peptide (CSP) to induce competence for natural transformation, and that other species of the mitis and the anginosus streptococcal groups use a ...
Markerless genome editing in competent streptococci 
Junges, Roger; Khan, Rabia; Tovpeko, Yanina; Åmdal, Heidi Aarø; Petersen, Fernanda Cristina; Morrison, Donald (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
Selective markers employed in classical mutagenesis methods using natural genetic transformation can affect gene expression, risk phenotypic effects, and accumulate as unwanted genes during successive mutagenesis cycles. ...
Overcoming the barrier of low efficiency during Genetic transformation of Streptococcus mitis 
Salvadori, Gabriela; Junges, Roger; Morrison, Donald A.; Petersen, Fernanda Cristina (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
Objective: Streptococcus mitis is a predominant oral colonizer, but difficulties in genetic manipulation of this species have hampered our understanding of the mechanisms it uses for colonization of oral surfaces. The aim ...
Comprehensive Transcriptome Profiles of Streptococcus mutans UA159 Map Core Streptococcal Competence Genes 
Khan, Rabia; Rukke, Håkon Valen; Høvik, Hedda; Åmdal, Heidi Aarø; Chen, T.; Morrison, Donald A.; Petersen, Fernanda Cristina (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
In Streptococcus mutans, an oral colonizer associated with dental caries, development of competence for natural genetic transformation is triggered by either of two types of peptide pheromones, competence-stimulating ...
A quorum-sensing system that regulates Streptococcus pneumoniae biofilm formation and surface polysaccharide production. 
Junges, Roger; Salvadori, Gabriela; Sudhanshu, Shekhar; Åmdal, Heidi Aarø; Periselneris, Jimstan; Chen, Tsute; Brown, Jeremy S.; Petersen, Fernanda Cristina (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
Despite vaccines, Streptococcus pneumoniae kills more than a million people yearly. Thus, understanding how pneumococci transition from commensals to pathogens is particularly relevant. Quorum sensing regulates collective ...
Naturally acquired human immunity to pneumococcus is dependent on antibody to protein antigens 
Wilson, Robert; Cohen, Jonathan M.; Reglinski, Mark; Jose, Ricardo J.; Chan, Win Yan; Marshall, Helina-Elaine; de Vogel, Corné; Gordon, Stephen V.; Goldblatt, David; Petersen, Fernanda Cristina; Baxendale, Helen; Brown, Jeremy S. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
Naturally acquired immunity against invasive pneumococcal disease (IPD) is thought to be dependent on anti-capsular antibody. However nasopharyngeal colonisation by Streptococcus pneumoniae also induces antibody to protein ...
Mouse IgG2a Antibodies Specific for the Commensal Streptococcus mitis Show Stronger Cross-Reactivity with Streptococcus pneumoniae than IgG1 Antibodies 
Shekhar, Sudhanshu; Khan, Rabia; Khan, Ata Ul Razzaq; Petersen, Fernanda Cristina (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
Here we show that mouse IgG2a and IgG1 antibodies specific for the commensal Streptococcus mitis cross-react with pathogen Streptococcus pneumoniae serotypes 2 and 4, although the cross-reactivity conferred by IgG2a is ...
Commensal bacteria: An emerging player in defense against respiratory pathogens 
Khan, Rabia; Petersen, Fernanda Cristina; Shekhar, Sudhanshu (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
A diverse community of trillions of commensal bacteria inhabits mucosal and epidermal surfaces in humans and plays an important role in defense against pathogens, including respiratory pathogens. Commensal bacteria act on ...
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Khan, Rabia (8)Junges, Roger (7)Morrison, Donald A. (6)Salvadori, Gabriela (5)... View MorePeer ReviewedPeer reviewed (25)
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