Global phylogenomic analysis of nonencapsulated Streptococcus pneumoniae reveals a deep-branching classic lineage that is distinct from multiple sporadic lineages.

Hilty, Markus; Wüthrich, Daniel; Salter, Susannah J; Engel, Hans Jürg; Campbell, Samuel; Sá-Leão, Raquel; de Lencastre, Hermínia; Hermans, Peter; Sadowy, Ewa; Turner, Paul; Chewapreecha, Claire; Diggle, Mathew; Pluschke, Gerd; McGee, Lesley; Eser, Ozgen Köseoğlu; Low, Donald E; Smith-Vaughan, Heidi; Endimiani, Andrea; Küffer, Marianne; Dupasquier, Mélanie; ... (2014). Global phylogenomic analysis of nonencapsulated Streptococcus pneumoniae reveals a deep-branching classic lineage that is distinct from multiple sporadic lineages. Genome biology and evolution, 6(12), pp. 3281-3294. Oxford University Press 10.1093/gbe/evu263

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The surrounding capsule of Streptococcus pneumoniae has been identified as a major virulence factor and is targeted by pneumococcal conjugate vaccines (PCV). However, nonencapsulated Streptococcus pneumoniae (Non-Ec-Sp) have also been isolated globally, mainly in carriage studies. It is unknown if Non-Ec-Sp evolve sporadically, if they have high antibiotic non-susceptiblity rates and a unique, specific gene content. Here, whole genome sequencing of 131 Non-Ec-Sp isolates sourced from 17 different locations around the world was performed. Results revealed a deep-branching classic lineage that is distinct from multiple sporadic lineages. The sporadic lineages clustered with a previously sequenced, global collection of encapsulated S. pneumoniae (Ec-Sp) isolates while the classic lineage is comprised mainly of the frequently identified multi-locus sequences types ST344 (n=39) and ST448 (n=40). All ST344 and nine ST448 isolates had high non-susceptiblity rates to β-lactams and other antimicrobials. Analysis of the accessory genome reveals that the classic Non-Ec-Sp contained an increased number of mobile elements, than Ec-Sp and sporadic Non-Ec-Sp. Performing adherence assays to human epithelial cells for selected classic and sporadic Non-Ec-Sp revealed that the presence of a integrative conjugative element (ICE) results in increased adherence to human epithelial cells (P=0.005). In contrast, sporadic Non-Ec-Sp lacking the ICE had greater growth in vitro possibly resulting in improved fitness. In conclusion, Non-Ec-Sp isolates from the classic lineage have evolved separately. They have spread globally, are well adapted to nasopharyngeal carriage and are able to coexist with Ec-Sp. Due to continued use of pneumococcal conjugate vaccines, Non-Ec-Sp may become more prevalent.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute for Infectious Diseases > Research
04 Faculty of Medicine > Service Sector > Institute for Infectious Diseases > Mycobacteriology
04 Faculty of Medicine > Service Sector > Institute for Infectious Diseases
04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Infectiology

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Hilty, Markus; Wüthrich, Daniel; Engel, Hans Jürg; Endimiani, Andrea; Küffer, Marianne; Bruggmann, Rémy; Hathaway, Lucy Jane and Mühlemann, Kathrin

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

1759-6653

Publisher:

Oxford University Press

Language:

English

Submitter:

Annelies Luginbühl

Date Deposited:

05 Jan 2015 09:40

Last Modified:

09 Feb 2017 14:33

Publisher DOI:

10.1093/gbe/evu263

PubMed ID:

25480686

Uncontrolled Keywords:

Pneumococcal isolates, antibiotic non-susceptibility, comparative genomics, integrative conjugative elements (ICEs), whole genome sequencing

BORIS DOI:

10.7892/boris.60909

URI:

https://boris.unibe.ch/id/eprint/60909

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