New insights into the transposition mechanisms of IS6110 and its dynamic distribution between Mycobacterium tuberculosis Complex lineages

Gonzalo-Asensio, J. (Universidad de Zaragoza) ; Pérez, I. (Universidad de Zaragoza) ; Aguiló, N. (Universidad de Zaragoza) ; Uranga, S. (Universidad de Zaragoza) ; Picó, A. (Universidad de Zaragoza) ; Lampreave, C. ; Cebollada, A. ; Otal, I. (Universidad de Zaragoza) ; Samper, S. ; Martín, C. (Universidad de Zaragoza)

Resumen: The insertion Sequence IS6110, only present in the pathogens of the Mycobacterium tuberculosis Complex (MTBC), has been the gold-standard epidemiological marker for TB for more than 25 years, but biological implications of IS6110 transposition during MTBC adaptation to humans remain elusive. By studying 2, 236 clinical isolates typed by IS6110-RFLP and covering the MTBC, we remarked a lineage-specific content of IS6110 being higher in modern globally distributed strains. Once observed the IS6110 distribution in the MTBC, we selected representative isolates and found a correlation between the normalized expression of IS6110 and its abundance in MTBC chromosomes. We also studied the molecular regulation of IS6110 transposition and we found a synergistic action of two post-transcriptional mechanisms: a -1 ribosomal frameshift and a RNA pseudoknot which interferes translation. The construction of a transcriptionally active transposase resulted in 20-fold increase of the transposition frequency. Finally, we examined transposition in M. bovis and M. tuberculosis during laboratory starvation and in a mouse infection model of TB. Our results shown a higher transposition in M. tuberculosis, that preferably happens during TB infection in mice and after one year of laboratory culture, suggesting that IS6110 transposition is dynamically adapted to the host and to adverse growth conditions.

Idioma: Inglés

DOI: 10.1371/journal.pgen.1007282

Año: 2018

Publicado en: PLoS Genetics 14, 4 (2018), e1007282[23 pp]
ISSN: 1553-7390

Factor impacto JCR: 5.224 (2018)

Categ. JCR: GENETICS & HEREDITY rank: 23 / 174 = 0.132 (2018) - Q1 - T1

Factor impacto SCIMAGO: 4.001 - Cancer Research (Q1) - Ecology, Evolution, Behavior and Systematics (Q1) - Molecular Biology (Q1) - Genetics (clinical) (Q1) - Genetics (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/FSE
Financiación: info:eu-repo/grantAgreement/EC/H2020/643381/EU/TBVAC2020; Advancing novel and promising TB vaccine candidates from discovery to preclinical and early clinical development/TBVAC2020
Financiación: info:eu-repo/grantAgreement/ES/ISCIII/FIS/PI15-0317
Financiación: info:eu-repo/grantAgreement/ES/MINECO/BIO2014-52580P

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Microbiología (Dpto. Microb.Med.Pr.,Sal.Públ.)
Área (Departamento): Proy. investigación HQA (Dpto. Microb.Med.Pr.,Sal.Públ.)