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© Research
Publication : PloS one

Adaptation in Toxic Environments: Arsenic Genomic Islands in the Bacterial Genus Thiomonas

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in PloS one - 30 Sep 2015

Freel KC, Krueger MC, Farasin J, Brochier-Armanet C, Barbe V, Andrès J, Cholley PE, Dillies MA, Jagla B, Koechler S, Leva Y, Magdelenat G, Plewniak F, Proux C, Coppée JY, Bertin PN, Heipieper HJ, Arsène-Ploetze F

Link to Pubmed [PMID] – 26422469

PLoS ONE 2015;10(9):e0139011

Acid mine drainage (AMD) is a highly toxic environment for most living organisms due to the presence of many lethal elements including arsenic (As). Thiomonas (Tm.) bacteria are found ubiquitously in AMD and can withstand these extreme conditions, in part because they are able to oxidize arsenite. In order to further improve our knowledge concerning the adaptive capacities of these bacteria, we sequenced and assembled the genome of six isolates derived from the Carnoulès AMD, and compared them to the genomes of Tm. arsenitoxydans 3As (isolated from the same site) and Tm. intermedia K12 (isolated from a sewage pipe). A detailed analysis of the Tm. sp. CB2 genome revealed various rearrangements had occurred in comparison to what was observed in 3As and K12 and over 20 genomic islands (GEIs) were found in each of these three genomes. We performed a detailed comparison of the two arsenic-related islands found in CB2, carrying the genes required for arsenite oxidation and As resistance, with those found in K12, 3As, and five other Thiomonas strains also isolated from Carnoulès (CB1, CB3, CB6, ACO3 and ACO7). Our results suggest that these arsenic-related islands have evolved differentially in these closely related Thiomonas strains, leading to divergent capacities to survive in As rich environments.

http://www.ncbi.nlm.nih.gov/pubmed/26422469