Overview
- The peer‑reviewed study published Wednesday in PNAS reports that about 90% of Arthrobacter strains sampled in Antarctic soils were not detected in global databases and appear restricted to the continent.
- Researchers compared global metagenomic data, sequenced more than 100 Antarctic Arthrobacter genomes and nearly 500 non‑Antarctic strains, and ran lab growth and stress tests to trace geographic patterns.
- Antarctic lineages showed distinct genomes, slower growth and greater tolerance of cold and dryness in laboratory trials, traits consistent with long‑term adaptation to polar soils.
- Authors warn that growing Antarctic tourism and expanded research stations increase the risk of introducing non‑native microbes on boots, clothing or equipment that could harm slow‑recovering soil communities.
- The result applies specifically to Arthrobacter and not to all microbes, and the team calls for broader surveys to learn whether similar lineage‑level endemism is common across other microbial groups.