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However, our understanding of the microbial diversity and the metabolic pathways underpinning methylotrophic methane production in river sediments is limited. Dimethylsulfide is an important methylated compound, found in freshwater sediments. Yet, the magnitude of DMS-dependent methanogenesis nor the methanogens carrying out this process in river sediments have been explored before. This study addressed this knowledge gap in DMS-dependent methanogenesis in gravel and sandy river sediments.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Significant methane production via DMS degradation was found in all sediment\u00a0 microcosms. Sandy, less permeable river sediments had higher methane yields (83 and 92%) than gravel, permeable sediments (40 and 48%). There was no significant difference between the methanogen diversity in DMS-amended gravel and sandy sediment\u00a0microcosms, which <jats:italic>Methanomethylovorans<\/jats:italic> dominated. Metagenomics data analysis also showed the dominance of <jats:italic>Methanomethylovorans<\/jats:italic> and <jats:italic>Methanosarcina<\/jats:italic>. DMS-specific methyltransferase genes (<jats:italic>mts<\/jats:italic>) were found in very low relative abundances whilst the methanol-, trimethylamine- and dimethylamine-specific methyltransferase genes (<jats:italic>mtaA<\/jats:italic>, <jats:italic>mttB<\/jats:italic> and <jats:italic>mtbB<\/jats:italic>) had the highest relative abundances, suggesting their involvement in DMS-dependent methanogenesis.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>This is the first study demonstrating a significant potential for DMS-dependent methanogenesis in river sediments with contrasting geologies. <jats:italic>Methanomethylovorans<\/jats:italic> were the dominant methylotrophic methanogen in all river sediment\u00a0microcosms. Methyltransferases specific to methylotrophic substrates other than DMS are likely key enzymes in DMS-dependent methanogenesis, highlighting their versatility and importance in the methane cycle in freshwater sediments, which would warrant further study.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40793-024-00591-4","type":"journal-article","created":{"date-parts":[[2024,7,20]],"date-time":"2024-07-20T05:02:23Z","timestamp":1721451743000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Methanomethylovorans are the dominant dimethylsulfide-degrading methanogens in gravel and sandy river sediment microcosms"],"prefix":"10.1186","volume":"19","author":[{"given":"S. L.","family":"Tsola","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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