AUTHOR=Delmont Tom O. , Eren A. Murat , Maccario Lorrie , Prestat Emmanuel , Esen Özcan C. , Pelletier Eric , Le Paslier Denis , Simonet Pascal , Vogel Timothy M. 

TITLE=Reconstructing rare soil microbial genomes using in situ enrichments and metagenomics

JOURNAL=Frontiers in Microbiology

VOLUME=6

YEAR=2015

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2015.00358

DOI=10.3389/fmicb.2015.00358

ISSN=1664-302X

ABSTRACT=<p>Despite extensive direct sequencing efforts and advanced analytical tools, reconstructing microbial genomes from soil using metagenomics have been challenging due to the tremendous diversity and relatively uniform distribution of genomes found in this system. Here we used enrichment techniques in an attempt to decrease the complexity of a soil microbiome prior to sequencing by submitting it to a range of physical and chemical stresses in 23 separate microcosms for 4 months. The metagenomic analysis of these microcosms at the end of the treatment yielded 540 Mb of assembly using standard <italic>de novo</italic> assembly techniques (a total of 559,555 genes and 29,176 functions), from which we could recover novel bacterial genomes, plasmids and phages. The recovered genomes belonged to <italic>Leifsonia</italic> (<italic>n</italic> = 2), <italic>Rhodanobacter</italic> (<italic>n</italic> = 5), <italic>Acidobacteria</italic> (<italic>n</italic> = 2), <italic>Sporolactobacillus</italic> (<italic>n</italic> = 2, novel nitrogen fixing taxon), <italic>Ktedonobacter</italic> (<italic>n</italic> = 1, second representative of the family <italic>Ktedonobacteraceae</italic>), <italic>Streptomyces</italic> (<italic>n</italic> = 3, novel polyketide synthase modules), and <italic>Burkholderia</italic> (<italic>n</italic> = 2, includes mega-plasmids conferring mercury resistance). Assembled genomes averaged to 5.9 Mb, with relative abundances ranging from rare (&lt;0.0001%) to relatively abundant (&gt;0.01%) in the original soil microbiome. Furthermore, we detected them in samples collected from geographically distant locations, particularly more in temperate soils compared to samples originating from high-latitude soils and deserts. To the best of our knowledge, this study is the first successful attempt to assemble multiple bacterial genomes directly from a soil sample. Our findings demonstrate that developing pertinent enrichment conditions can stimulate environmental genomic discoveries that would have been impossible to achieve with canonical approaches that focus solely upon post-sequencing data treatment.</p>