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Open AccessArticle

Into the Thermus Mobilome: Presence, Diversity and Recent Activities of Insertion Sequences Across Thermus spp.

Department of Biotechnology, Faculty of Experimental Sciences, Universidad Francisco de Vitoria, Madrid 28223, Spain
Centro de Biología Molecular Severo Ochoa (CBMSO), Universidad Autónoma de Madrid-Consejo Superior de Investigaciones Científicas, Madrid 28049, Spain
Author to whom correspondence should be addressed.
Microorganisms 2019, 7(1), 25;
Received: 27 November 2018 / Revised: 9 January 2019 / Accepted: 17 January 2019 / Published: 21 January 2019
(This article belongs to the Special Issue Thermophiles and Thermozymes)
A high level of transposon-mediated genome rearrangement is a common trait among microorganisms isolated from thermal environments, probably contributing to the extraordinary genomic plasticity and horizontal gene transfer (HGT) observed in these habitats. In this work, active and inactive insertion sequences (ISs) spanning the sequenced members of the genus Thermus were characterized, with special emphasis on three T. thermophilus strains: HB27, HB8, and NAR1. A large number of full ISs and fragments derived from different IS families were found, concentrating within megaplasmids present in most isolates. Potentially active ISs were identified through analysis of transposase integrity, and domestication-related transposition events of ISTth7 were identified in laboratory-adapted HB27 derivatives. Many partial copies of ISs appeared throughout the genome, which may serve as specific targets for homologous recombination contributing to genome rearrangement. Moreover, recruitment of IS1000 32 bp segments as spacers for CRISPR sequence was identified, pointing to the adaptability of these elements in the biology of these thermophiles. Further knowledge about the activity and functional diversity of ISs in this genus may contribute to the generation of engineered transposons as new genetic tools, and enrich our understanding of the outstanding plasticity shown by these thermophiles. View Full-Text
Keywords: insertion sequence; transposons; transposases; HGT; Thermus; thermophiles; mobilome insertion sequence; transposons; transposases; HGT; Thermus; thermophiles; mobilome
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Blesa, A.; Sánchez, M.; Sacristán-Horcajada, E.; González-de la Fuente, S.; Peiró, R.; Berenguer, J. Into the Thermus Mobilome: Presence, Diversity and Recent Activities of Insertion Sequences Across Thermus spp.. Microorganisms 2019, 7, 25.

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