{"id":11883,"date":"2017-10-23T10:23:02","date_gmt":"2017-10-23T17:23:02","guid":{"rendered":"https:\/\/www.darkenergybiosphere.org\/?post_type=publication&#038;p=11883"},"modified":"2017-12-04T11:57:44","modified_gmt":"2017-12-04T19:57:44","slug":"acetoclastic-methanosaeta-are-dominant-methanogens-in-organic-rich-antarctic-marine-sediments","status":"publish","type":"publication","link":"https:\/\/www.darkenergybiosphere.org\/publication\/acetoclastic-methanosaeta-are-dominant-methanogens-in-organic-rich-antarctic-marine-sediments\/","title":{"rendered":"Acetoclastic <em>Methanosaeta<\/em> are dominant methanogens in organic-rich Antarctic marine sediments"},"content":{"rendered":"<p>Despite accounting for the majority of sedimentary methane, the physiology and relative abundance of subsurface methanogens remain poorly understood. We combined intact polar lipid and metagenome techniques to better constrain the presence and functions of methanogens within the highly reducing, organic-rich sediments of Antarctica\u2019s Ad\u00e9lie Basin. The assembly of metagenomic sequence data identified phylogenic and functional marker genes of methanogens and generated the first\u00a0<i>Methanosaeta<\/i>\u00a0sp. genome from a deep subsurface sedimentary environment. Based on structural and isotopic measurements, glycerol dialkyl glycerol tetraethers with diglycosyl phosphatidylglycerol head groups were classified as biomarkers for active methanogens. The stable carbon isotope (\u03b4<sup>13<\/sup>C) values of these biomarkers and the\u00a0<i>Methanosaeta\u00a0<\/i>partial genome suggest that these organisms are acetoclastic methanogens and represent a relatively small (0.2<span class=\"mb\">%<\/span>) but active population. Metagenomic and lipid analyses suggest that Thaumarchaeota and heterotrophic bacteria co-exist with\u00a0<i>Methanosaeta<\/i>\u00a0and together contribute to increasing concentrations and \u03b4<sup>13<\/sup>C values of dissolved inorganic carbon with depth. This study presents the first functional insights of deep subsurface\u00a0<i>Methanosaeta<\/i>\u00a0organisms and highlights their role in methane production and overall carbon cycling within sedimentary environments.<\/p>\n","protected":false},"template":"","tags":[],"publication_type":[19],"_links":{"self":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication\/11883"}],"collection":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication"}],"about":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/types\/publication"}],"wp:attachment":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/media?parent=11883"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/tags?post=11883"},{"taxonomy":"publication_type","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication_type?post=11883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}