Geoarchaeota: a new candidate phylum in the Archaea from high-temperature acidic iron mats in Yellowstone National Park

Researchers have identified 'Geoarchaeota' (or novel archaeal group 1, NAG1), a new candidate phylum within the Archaea domain, thriving in high-temperature acidic iron mats of Yellowstone National Park. This discovery sheds light on microbial diversity and metabolic adaptations in extreme environments, including those with low pH, high temperatures, and reduced oxygen. The study employed replicate de novo genome assemblies to analyze conserved ribosomal and informational processing genes, revealing unique pathways for peptide and carbohydrate catabolism, energy conservation via a bacterial-like carbon monoxide dehydrogenase complex, and oxygen metabolism involving heme copper oxidase and terminal oxidase systems. NAG1 also exhibits distinct cofactor biosynthesis, transport genes, and a Type3-like CRISPR system, offering insights into the evolution of Archaea in early Earth environments and their potential analogs in Yellowstone's geothermal systems.

Kozubal, M. A., Romine, M., Jennings, R. d., Jay, Z. J., Tringe, S. G., Rusch, D. B., Beam, J. P., McCue, L. A., & Inskeep, W. P. (2012). Geoarchaeota: a new candidate phylum in the Archaea from high-temperature acidic iron mats in Yellowstone National Park. The ISME Journal, 7(3), 622–634. https://doi.org/10.1038/ismej.2012.132