Our microbial ancestors were probably oxygen-tolerant

Nature, Published online: 18 March 2026; doi:10.1038/d41586-026-00718-2Genomic analysis has unexpectedly revealed that microorganisms called Asgard archaea, the closest relative of our cellular ancestors, can respire using oxygen.

Our microbial ancestors were probably oxygen-tolerant
Our microbial ancestors were probably oxygen-tolerant Photo: Nature News

This is a summary of: Appler, K.

E.

et al.

Oxygen metabolism in descendants of the archaeal-eukaryotic ancestor.

Nature https://doi.org/10.1038/s41586-026-10128-z (2026) .

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doi: https://doi.org/10.1038/d41586-026-00718-2
‘Expert opinion’ is published under a CC BY 4.0 licence.

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