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Genotypic and phenotypic diversity of the noncapsulated Haemophilus influenzae: Adaptation and pathogenesis in the human airways

AutorGarmendia, Juncal ; Martí-Lliteras, Pau; Moleres, Javier ; Puig, Carmen; Bengoechea, José Antonio
Palabras claveHaemophilus infl uenzae
Noncapsulated/nontypable Haemophilus infl uenzae (NTHi)
Pathogen-host interplay
Genetic diversity
Virulence phenotype
Fecha de publicación2012
EditorSociedad Española de Microbiología
CitaciónInternational Microbiology 15: 159-172 (2012)
ResumenThe human respiratory tract contains a highly adapted microbiota including commensal and opportunistic pathogens. Noncapsulated or nontypable Haemophilus influenzae (NTHi) is a human-restricted member of the normal airway microbiota in healthy carriers and an opportunistic pathogen in immunocompromised individuals. The duality of NTHi as a colonizer and as a symptomatic infectious agent is closely related to its adaptation to the host, which in turn greatly relies on the genetic plasticity of the bacterium and is facilitated by its condition as a natural competent. The variable genotype of NTHi accounts for its heterogeneous gene expression and variable phenotype, leading to differential host-pathogen interplay among isolates. Here we review our current knowledge of NTHi diversity in terms of genotype, gene expression, antigenic variation, and the phenotypes associated with colonization and pathogenesis. The potential benefits of NTHi diversity studies discussed herein include the unraveling of pathogenicity clues, the generation of tools to predict virulence from genomic data, and the exploitation of a unique natural system for the continuous monitoring of long-term bacterial evolution in human airways exposed to noxious agents. Finally, we highlight the challenge of monitoring both the pathogen and the host in longitudinal studies, and of applying comparative genomics to clarify the meaning of the vast NTHi genetic diversity and its translation to virulence phenotypes.
Versión del editorhttp://doi.org/10.2436/20.1501.01.169
URIhttp://hdl.handle.net/10261/147442
DOI10.2436/20.1501.01.169
Identificadoresissn: 1139-6709
e-issn: 1618-1905
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