A metagenomic insight into the microbiomes of geothermal springs in the Subantarctic Kerguelen Islands.

The Kerguelen Islands, located in the southern part of the Indian Ocean, are very isolated geographically. The microbial diversity and communities present on the island, especially associated to geothermal springs, have never been analyzed with high-throughput sequencing methods. In this article, we performed the first metagenomics analysis of microorganisms present in Kerguelen hot springs.

Genome analysis of a new sulphur disproportionating species strain F29 and comparative genomics of sulfur-disproportionating bacteria from marine hydrothermal vents.

This paper reports on the genome analysis of strain F29 representing a new species of the genus . This strain, isolated from the Lucky Strike hydrothermal vent field on the Mid-Atlantic Ridge, is able to grow by disproportionation of S with CO as a carbon source. Strain F29 possesses a genome of 2,345,565 bp, with a G+C content of 58.

Genetic Potential of , an Obligate Sulfur-Disproportionating Thermophilic Microorganism.

The biochemical pathways of anaerobic sulfur disproportionation are only partially deciphered, and the mechanisms involved in the first step of S-disproportionation remain unknown. Here, we present the results of sequencing and analysis of the complete genome of strain Sh68, one of two strains isolated to date known to grow exclusively by anaerobic disproportionation of inorganic sulfur compounds. Sh68 is a motile, thermophilic, anaerobic, chemolithoautotrophic microorganism isolated from a hydrothermal pond at Uzon caldera, Kamchatka, Russia.

Genomic Characterization and Environmental Distribution of a Thermophilic Anaerobe SH388 Involved in Disproportionation of Sulfur Compounds in Shallow Sea Hydrothermal Vents.

Marine hydrothermal systems are characterized by a pronounced biogeochemical sulfur cycle with the participation of sulfur-oxidizing, sulfate-reducing and sulfur-disproportionating microorganisms. The diversity and metabolism of sulfur disproportionators are studied to a much lesser extent compared with other microbial groups. SH388 is an anaerobic thermophilic bacterium isolated from a shallow sea hydrothermal vent.

The events that may contribute to subgingival dysbiosis: a focus on the interplay between iron, sulfide and oxygen.

This minireview considers the disruption of the host-microbiota harmless symbiosis in the subgingival niche. The establishment of a chronic infection by subversion of a commensal microbiota results from a complex and multiparametric sequence of events. This review narrows down to the interplay between oxygen, iron and sulfide that can result in a vicious cycle that would favor peroxygenic and glutathione producing streptococci as well as sulfidogenic anaerobic pathogens in the subgingival niche.