2023
DOI: 10.3389/fmicb.2023.1205558
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Metapangenomic investigation provides insight into niche differentiation of methanogenic populations from the subsurface serpentinizing environment, Samail Ophiolite, Oman

Abstract: Serpentinization reactions produce highly reduced waters that have hyperalkaline pH and that can have high concentrations of H2 and CH4. Putatively autotrophic methanogenic archaea have been identified in the subsurface waters of the Samail Ophiolite, Sultanate of Oman, though the strategies to overcome hyperalkaline pH and dissolved inorganic carbon limitation remain to be fully understood. Here, we recovered metagenome assembled genomes (MAGs) and applied a metapangenomic approach to three different Methanob… Show more

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(3 citation statements)
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“…The prevalence of group 4 [NiFe]hydrogenases was also higher in communities from Type II waters. Taxonomic profiling of the genomes from which these protein encoding genes were derived (Supplementary Table SB3) indicated that they were associated with methanogenic archaea affiliated with Methanobacterium, putative hydrogenotrophic sulfate reducers (e.g., Desulfonatronum), and the bacterial acetogens within Acetothermia, among many other uncultured taxa (Supplementary Table SB3), consistent with previous studies documenting the increased prevalence of these groups in Type II waters (Rempfert et al, 2017;Fones et al, 2019;Nothaft et al, 2021b;Kraus et al, 2021;Templeton et al, 2021;Colman et al, 2022;Munro-Ehrlich et al, 2023;Thieringer et al, 2023).…”
Section: Abundance Of Hydrogenase Enzymessupporting
confidence: 84%
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“…The prevalence of group 4 [NiFe]hydrogenases was also higher in communities from Type II waters. Taxonomic profiling of the genomes from which these protein encoding genes were derived (Supplementary Table SB3) indicated that they were associated with methanogenic archaea affiliated with Methanobacterium, putative hydrogenotrophic sulfate reducers (e.g., Desulfonatronum), and the bacterial acetogens within Acetothermia, among many other uncultured taxa (Supplementary Table SB3), consistent with previous studies documenting the increased prevalence of these groups in Type II waters (Rempfert et al, 2017;Fones et al, 2019;Nothaft et al, 2021b;Kraus et al, 2021;Templeton et al, 2021;Colman et al, 2022;Munro-Ehrlich et al, 2023;Thieringer et al, 2023).…”
Section: Abundance Of Hydrogenase Enzymessupporting
confidence: 84%
“…These inferences are corroborated by direct measurements of biological 14 C-HCO 3 − reduction to CH 4 activity measurements and transcriptomic data (Fones et al, 2019;Kraus et al, 2021). Intriguingly, Methanobacterium populations detected in the Samail ophiolite parse into distinct lineages in the more oxidizing and CO 2 containing Type I vs. the more H 2 -rich, CO 2 limited Type II fluids (Fones et al, 2021;Thieringer et al, 2023). Those that are primarily found in Type II fluids have evolved to replace H 2dependent biochemical reactions with those dependent on formate.…”
Section: H 2 -Dependent Microbial Communitiesmentioning
confidence: 74%
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