{"id":4965,"date":"2025-08-20T23:42:24","date_gmt":"2025-08-20T23:42:24","guid":{"rendered":"https:\/\/dornsife.usc.edu\/wrigley\/?p=4965"},"modified":"2025-09-26T23:45:52","modified_gmt":"2025-09-26T23:45:52","slug":"extremophile-microbes-karen-lloyd-research","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/wrigley\/2025\/08\/20\/extremophile-microbes-karen-lloyd-research\/","title":{"rendered":"Looking for life in unimaginable places"},"content":{"rendered":"\n\n\n\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/KarenLloyd-cr.-MonicaAlmeida-Lede-scaled-1-768x432.jpeg\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/KarenLloyd-cr.-MonicaAlmeida-Lede-scaled-1-1920x1080.jpeg 1920w,https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/KarenLloyd-cr.-MonicaAlmeida-Lede-scaled-1-1280x720.jpeg 1280w,https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/KarenLloyd-cr.-MonicaAlmeida-Lede-scaled-1-768x432.jpeg 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  alt=\"A scientist stands confidently on a boat dock in front of a research vessel, her arms crossed and her gaze directed to her right. She is wearing heavy hiking boots and field clothing.\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  Karen Lloyd, the Wrigley Chair in Environmental Studies and Professor of Earth Sciences, stands on a boat dock at the Port of Los Angeles. She studies extremophiles: microbes that live in extreme environments (such as on the ocean floor or inside Arctic permafrost) and whose lifespans extend for thousands of years. (Photo: Monica Almeida\/Quanta Magazine)\n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>Looking for life in unimaginable places<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  Researcher Karen Lloyd probes mysteries of microbes living in Earth&#8217;s most extreme environments\n\n\n<\/div>\n      <\/div>\n    \n    \n          <span class=\"post-date-field\">August 20, 2025<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--social-share \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--social-share\"\n    \n      >\n\n    \n  <div class=\"content-wrapper\">\n    <span class=\"a2a_kit a2a_kit_size_32 addtoany_list\" style=\"line-height: 32px;\">\n      <span class=\"title\">\n        Share\n      <\/span>\n                        <a 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class=\"a2a_label visually-hidden\">Email<\/span>\n          <\/a>\n                  <\/span>\n  <\/div>\n\n  <\/div><\/div>\n \n\n\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p><em>Original story by Laura Poppick<\/em><\/p>\n<p class=\"p1\">When she was a kid, <a href=\"https:\/\/dornsife.usc.edu\/profile\/karen-lloyd\/\" target=\"_blank\" rel=\"noopener\">Karen Lloyd<\/a> enjoyed mucking around along estuaries and beaches on the coast of North Carolina where she lived. With net in hand, the future microbial geochemist dredged up seaweed and mud squirming with snails, crab larvae and other small invertebrates. To the young Lloyd, these were marvelous hidden worlds, out of sight but no less interesting than fish and whales. These childhood experiences made an impression, instilling in her a belief that there is \u201ca lot more to reality than we can see with our eyes,\u201d she said.<\/p>\n<p class=\"p1\">She has since built her career around this belief. Using tools from bioinformatics and geochemistry, Lloyd, now at the University of Southern California, makes organisms visible that are doubly beyond our view \u2014 in terms of their microscopic size and their hard-to-reach locations. She studies single-celled microbes that manage to survive in rock 5 kilometers or more below the Earth\u2019s surface, where they live impossibly far from sunlight and oxygen, and push the boundaries of life\u2019s relationship with time and energy.<\/p>\n<figure id=\"attachment_4967\" aria-describedby=\"caption-attachment-4967\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-4967\" src=\"https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/Karen-Lloyd-volcano.jpg\" alt=\"A scientist stands at the ends of a fresh lava flow that is several feet high. Wearing a helmet, face shield, fireproof gloves, and full-length leather apron, she uses a long-handled ladle to scoop a sample from the lava.\" width=\"800\" height=\"445\" srcset=\"https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/Karen-Lloyd-volcano.jpg 1816w, https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/Karen-Lloyd-volcano-300x167.jpg 300w, https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/Karen-Lloyd-volcano-1024x570.jpg 1024w, https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/Karen-Lloyd-volcano-768x428.jpg 768w, https:\/\/dornsife.usc.edu\/wrigley\/wp-content\/uploads\/sites\/116\/2025\/09\/Karen-Lloyd-volcano-1536x855.jpg 1536w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-4967\" class=\"wp-caption-text\">Karen Lloyd scoops lava from a fresh flow at Fagradalsfjall volcano in 2021. She was in the area to study how microbes in the nearby hot springs were affected by the new eruption. (Photo: Peter Barry)<\/figcaption><\/figure>\n<p class=\"p1\">Until the 1980s, these subsurface ecosystems were unknown to science; Earth\u2019s crust was considered lifeless. Then, after microbiologists\u00a0<a href=\"https:\/\/doi.org\/10.1016\/S0065-2164(08)70206-5\" target=\"_blank\" rel=\"noopener\">cultured cells from aquifer sediments <\/a>located 30 meters beneath the surface, the race was on to find microbes in more extreme, unexpected habitats. But it would take several decades to begin identifying these organisms using their DNA.<\/p>\n<p class=\"p1\">In 2013, taking advantage of advances in DNA sequencing, <a href=\"https:\/\/doi.org\/10.1038\/nature12033\" target=\"_blank\" rel=\"noopener\">Lloyd\u2019s team published <\/a>the first whole-genome sequences of microbial cells living in marine sediments beneath the seafloor in Aarhus Bay, Denmark. The trailblazing study revealed that those sediments teemed with microbes that sit deep on the branches of the tree of life and feed by slowly degrading bits of protein buried in the sediment. This was a previously unknown feeding mechanism for archaea, a branch of single-celled organisms separate from bacteria.<\/p>\n<p class=\"p1\">The scientific community has now accepted that bacteria and archaea thrive in the subsurface, representing a massive biome that collectively outweighs more than 200 million blue whales, according to Lloyd\u2019s calculations. In the decade since their discovery, she and her colleagues have sifted through more genomic data and conducted laboratory experiments on the cells. Their findings have expanded their perception of life\u2019s metabolic limits. From the ability to \u201cbreathe\u201d rocks to possibly living for hundreds of thousands or even millions of years, these subsurface microbes \u2014 known as \u201cintraterrestrials\u201d for their ability to survive within the planet \u2014 have forced Lloyd to evolve her own understanding of biology\u2019s universal laws.<\/p>\n<p class=\"p1\">While an organism that lives for millions of years may sound extraordinary to us, these ultra-long-lived microbes may actually be quite ordinary on Earth. In a recent comment in\u00a0<i>Nature Microbiology<\/i>, Lloyd and her fellow USC microbiologist <a href=\"https:\/\/dornsife.usc.edu\/profile\/drew-steen\/\" target=\"_blank\" rel=\"noopener\">Andrew Steen<\/a> advocated for naming these long-lived subsurface microbes \u201c<a href=\"https:\/\/doi.org\/10.1038\/s41564-025-02048-x\" target=\"_blank\" rel=\"noopener\">aeonophiles<\/a>\u201d in reference to their love of eons, or immeasurable lengths of time.<\/p>\n<p class=\"p1\">Beyond expanding our perceptions of reality, these microbes may also offer more practical applications. The enzymes that stabilize these cells underground for millennia may be able to stabilize other types of materials, such as medicines in transit to remote areas, Lloyd suggested. Thousands of gene sequences with potential candidates for this type of practical application now exist in the public domain thanks to the work of Lloyd and her colleagues. \u201cIt\u2019s just a matter of sifting through the firehose of possibility and finding gold,\u201d Lloyd said. \u201cIt\u2019s improbable that there\u2019s nothing useful in there.\u201d<\/p>\n<p class=\"p1\">With two TED Talks under her belt, and the recent publication of her book\u00a0<a href=\"https:\/\/press.princeton.edu\/books\/hardcover\/9780691236117\/intraterrestrials\" target=\"_blank\" rel=\"noopener\"><i>Intraterrestrials: Discovering the Strangest Life on Earth<\/i><i><\/i><\/a>, Lloyd has become something of an ambassador for the microbes that live in our planet\u2019s deep rocks and sediments.\u00a0<i>Quanta Magazine\u00a0<\/i>spoke with her about her experience researching these hard-to-reach biomes and what they can teach us about the limits of life on Earth.<\/p>\n<p><a href=\"https:\/\/www.quantamagazine.org\/the-pursuit-of-life-where-it-seems-unimaginable-20250820\/\" target=\"_blank\" rel=\"noopener\">Read the full Q&amp;A on the Quanta Magazine website &gt;&gt;<\/a><\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":182,"featured_media":4966,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[41],"tags":[45,72,16,50,14],"class_list":["post-4965","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","tag-climate-and-carbon-management-initiative","tag-earth-sciences","tag-faculty","tag-faculty-innovation-award","tag-research"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - 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