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mbl a-z | careers | registration | contact marine biological laboratory biological discovery in woods hole home about about the mbl leadership uchicago affiliation advisory bodies history mbl society annual reports careers visit pierce exhibit center tours gift shop directions contact research overview funding opportunities division staff office of sponsored programs (osp) recent federal grants environmental health and safety foreign national visitors mbl scientists mbl research centers mbl fellows strategic themes scientific publications library education overview division staff major program support information for students information for faculty foreign national visitors courses advanced research training courses undergraduate programs secondary school programs registration forms other programs convening overview whitman center mbl fellows conferences & workshops registration forms housing children’s programs life in woods hole news mbl news the well connect media information publications events calendar seminars friday evening lectures falmouth forum giving support the mbl make an online gift planned giving volunteer large-scale study indicates novel, abundant nitrogen-fixing microbes in surface ocean contact: diana kenney, marine biological laboratory 508-289-7139; [email protected] woods hole, mass.— move over, cyanobacteria! a large-scale study of the earth’s surface ocean indicates the microbes responsible for fixing nitrogen there—previously thought to be almost exclusively photosynthetic cyanobacteria–include an abundant and widely distributed suite of non-photosynthetic bacterial populations. a. murat eren (meren) and tom delmont working with tara oceans data at the university of chicago in 2017. credit: fran jackson the international study, published this week in nature microbiology , was led by a. murat eren (meren) of the university of chicago and the marine biological laboratory (mbl), woods hole, and tom o. delmont of the university of chicago. nitrogen fixation is a critical ecological process in which atmospheric nitrogen is converted to ammonia, making nitrogen “bioavailable” to living organisms to use as a fundamental building block of dna, rna and proteins. “microbes that can fix nitrogen or carbon are at the center of the ecology of microbial communities in many environments, including the surface ocean,” delmont says. “prior to our study, it was thought that the marine microbes responsible for carbon fixation were also largely responsible for fixing nitrogen. it turns out not to be so simple.” “the ability of microbes to fix nitrogen is vital to all life,” says david mark welch, mbl director of research. “this study expands our understanding of the biological diversity of nitrogen fixation by providing the first genomic evidence that non-photosynthetic bacteria on the ocean surface can carry out these reactions.” using anvi’o , a state-of-the-art, open-source bioinformatics platform to analyze metagenomes (the pool of dna sequences that represent all the microbial organisms found in an environment), the team revealed insights into previously unknown marine microbes with nitrogen fixation capabilities affiliated with proteobacteria as well as planctomycetes, a prevalent bacterial phylum that has never been linked to nitrogen fixation before. these newly described microbial populations occur widely and are particularly abundant in the pacific ocean, where they average an estimated 700,000 cells per liter of seawater and up to 3 million cells per liter—orders of magnitude more than previous estimates for non-cyanobacterial nitrogen fixers in the open ocean. using data generated from the tara oceans expedition from 2009 to 2013, delmont and colleagues reconstructed about 1,000 microbial genomes from more than 30 billion short metagenomic sequences. of those 1,000 genomes, nine contained the six genes that are required for nitrogen fixation, and yet lacked the genes needed for photosynthesis. this is the first genomic database of non-photosynthetic microorganisms inhabiting the open ocean and capable of fixing nitrogen. nexus between phylogeny and function of the newly discovered nitrogen fixers in surface ocean metagenomes. (a) phylogenomic analysis of 432 proteobacteria genomes and 43 planctomycetes genomes that delmont and colleagues characterized (including the nine non-photosynthetic n fixers) using a collection of 37 phylogenetic marker gene families. layers surrounding the phylogenomic tree indicate genome size and taxonomy of each genome at the phylum and class level. (b) functional network of the nine non-photosynthetic n fixers based on a total of 5,912 identified gene functions. size and color of genomic nodes represent the number of detected functions and genomic taxonomy, respectively. the color of functional nodes indicates their occurrence in the different genomes. from delmont et al (2018) nature microbiology, doi: 10.1038/s41564-018-0176-9 because the team reconstructed and used near-complete genomes for their investigation (rather than using a single marker gene for nitrogen fixation), they could resolve the taxonomic affiliations of these nitrogen-fixing populations. they could also investigate their abundance and distribution patterns in the oceans and seas from which the samples came (the atlantic, pacific, indian and southern oceans and the mediterranean and red seas). “we can now use these population genomes to guide the laboratory cultivation of nitrogen-fixing planctomycetes and proteobacteria from the open ocean,” delmont says. “this will help us understand the conditions in which they fix nitrogen, the complexity of their functional lifestyles, and other aspects of their ecology that we cannot comprehend by just looking at their genomes, genes and inferred functions.” meren and delmont began this research at the marine biological laboratory in 2015 with the support of a university of chicago lillie innovation award. meren and his group continue to develop anvi’o, the open-source software platform used in this and other studies investigating the ecology and evolution of microbes through complex environmental sequencing data. “environmental metagenomes give us unadulterated access to the complexity of naturally occurring microbial populations,” meren says. “while our ability to understand them is at the mercy of our molecular technologies and computational tools, it is refreshing to see both advancing rapidly, and there is still so much to discover. we look forward to seeing bench-side advances substantiating these initial insights into environmental populations that likely contribute to one of the most essential biochemical processes that make our planet tick.” “this study is another example of how resolving genomes directly from the dna of entire microbial communities is transforming our understanding of microbial diversity,” says co-author christopher quince of the university of warwick, united kingdom. in addition to delmont, meren and quince, other collaborators in this study include alon shaiber, özcan c. esen, and sonny t. m. lee of the university of chicago, michael s. rappé of the university of hawaii at mānoa, sandra l. mclellan of the university of wisconsin-milwaukee, and sebastian lücker of radboud university, the netherlands. citation: delmont, t.o. et al (2018) nitrogen-fixing populations of planctomycetes and proteobacteria are abundant in surface ocean metagenomes. nature microbiology , doi: 10.1038/s41564-018-0176-9 . —###— the marine biological laboratory (mbl) is dedicated to scientific discovery – exploring fundamental biology, understanding marine biodiversity and the environment, and informing the human condition through research and education. founded in woods hole, massachusetts in 1888, the mbl is a private, nonprofit institution and an affiliate of the university of chicago . mbl announces 2018 friday evening lecture series the marine biological laboratory is pleased to announ

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