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Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2026,9,15]]},"abstract":"<jats:p>\n                    Antarctic soils represent one of the most extreme environments for microbial life on Earth, yet they harbor heterogeneous and diverse microbial communities. Biologists have long hypothesized that Antarctic microorganisms are unique from those found on other continents due to the extreme geographic isolation and the cold, dry, and challenging conditions typical of Antarctica. To test this hypothesis, we focused on a cosmopolitan bacterial genus,\n                    <jats:italic toggle=\"yes\">Arthrobacter<\/jats:italic>\n                    , that is widely distributed across global soils. We first profiled a global metagenomic dataset from both Antarctic and non-Antarctic surface soils to quantify the distributions of\n                    <jats:italic toggle=\"yes\">Arthrobacter<\/jats:italic>\n                    strains. Despite high strain-level diversity, 90% of the strains found in the Antarctic soils were only found on the continent. We then used cultivation-based phenotypic analyses and strain-level genomic comparisons to assess how Antarctic strains and non-Antarctic strains differ in their traits and environmental preferences. Not only did we find evidence of endemism, but Antarctic\n                    <jats:italic toggle=\"yes\">Arthrobacter<\/jats:italic>\n                    also have genomic characteristics and environmental tolerances that suggest they are uniquely adapted to Antarctic conditions.\n                  <\/jats:p>","DOI":"10.1073\/pnas.2611373123","type":"journal-article","created":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T19:03:36Z","timestamp":1788203016000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":1,"title":["Evidence for endemism and local adaptation in Antarctic soil bacteria"],"prefix":"10.1073","volume":"123","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8983-6482","authenticated-orcid":false,"given":"Nicholas B.","family":"Dragone","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02ttsq026","id-type":"ROR","asserted-by":"publisher"}],"name":"Cooperative Institute for Research in Environmental Sciences, University of Colorado","place":["Boulder"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mary K.","family":"Childress","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02ttsq026","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Ecology and Evolutionary Biology, University of Colorado Boulder","place":["Boulder"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noah","family":"Mendez","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02ttsq026","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Ecology and Evolutionary Biology, University of Colorado Boulder","place":["Boulder"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jordan","family":"Galletta","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02ttsq026","id-type":"ROR","asserted-by":"publisher"}],"name":"Cooperative Institute for Research in Environmental Sciences, University of Colorado","place":["Boulder"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caihong","family":"Vanderburgh","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02ttsq026","id-type":"ROR","asserted-by":"publisher"}],"name":"Cooperative Institute for Research in Environmental Sciences, University of Colorado","place":["Boulder"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2565-7100","authenticated-orcid":false,"given":"Clifton P.","family":"Bueno de Mesquita","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02ttsq026","id-type":"ROR","asserted-by":"publisher"}],"name":"Cooperative Institute for Research in Environmental Sciences, University of Colorado","place":["Boulder"]},{"id":[{"id":"https:\/\/ror.org\/02ttsq026","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Ecology and Evolutionary Biology, University of Colorado Boulder","place":["Boulder"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5585-4551","authenticated-orcid":false,"given":"Kristen M.","family":"DeAngelis","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0072zz521","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Microbiology, University of Massachusetts Amherst","place":["Amherst"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0260-8995","authenticated-orcid":false,"given":"C. 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