Biology

Diversification of methanogens into hyperalkaline serpentinizing environments through adaptations to minimize oxidant limitation

E. M. Fones, D. R. Colman, et al.

Discover the intriguing diversity of Methanobacterium lineages in the Samail Ophiolite! This groundbreaking research, conducted by Elizabeth M. Fones and colleagues, unveils how Type I and Type II lineages adapt their methanogenic strategies to survive in unique chemical environments, challenging previous assumptions about CO2 limitations in these settings.

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Playback language: English

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Abstract

Metagenome assembled genomes (MAGs) and single amplified genomes (SAGs) from the Samail Ophiolite revealed two Methanobacterium lineages. Type I, abundant in circumneutral pH waters, used typical hydrogenotrophic methanogenesis. Type II, prevalent in hyperalkaline, hydrogen-rich waters, lacked key hydrogenases but used formate oxidation to generate reductant and CO2, overcoming CO2 limitation. Radiotracer experiments confirmed methane production from formate by Type II. Phylogenetic analysis indicated recent diversification driven by gene transfer, loss, and transposition, highlighting CO2 availability as a selective pressure in serpentinizing environments.

Publisher

The ISME Journal

Published On

Nov 30, 2020

Authors

Elizabeth M. Fones, Daniel R. Colman, Emily A. Kraus, Ramunas Stepanaukas, Alexis S. Templeton, John R. Spear, Eric S. Boyd

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