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Title: Elucidating Syntrophic Butyrate-Degrading Populations in Anaerobic Digesters Using Stable-Isotope-Informed Genome-Resolved Metagenomics

Abstract

Linking the genomic content of uncultivated microbes to their metabolic functions remains a critical challenge in microbial ecology. Resolving this challenge has implications for improving our management of key microbial interactions in biotechnologies such as anaerobic digestion, which relies on slow-growing syntrophic and methanogenic communities to produce renewable methane from organic waste. In this study, we combined DNA stable-isotope probing (SIP) with genome-centric metagenomics to recover the genomes of populations enriched in13C after growing on [13C]butyrate. Differential abundance analysis of recovered genomic bins across the SIP metagenomes identified two metagenome-assembled genomes (MAGs) that were significantly enriched in heavy [13C]DNA. Phylogenomic analysis assigned one MAG to the genus Syntrophomonas and the other MAG to the genus Methanothrix. Metabolic reconstruction of the annotated genomes showed that the Syntrophomonas genome encoded all the enzymes for beta-oxidizing butyrate, as well as several mechanisms for interspecies electron transfer via electron transfer flavoproteins, hydrogenases, and formate dehydrogenases. The Syntrophomonas genome shared low average nucleotide identity (<95%) with any cultured representative species, indicating that it is a novel species that plays a significant role in syntrophic butyrate degradation within anaerobic digesters. The Methanothrix genome contained the complete pathway for acetoclastic methanogenesis, indicating that it was enriched in13Cmore » from syntrophic acetate transfer. This study demonstrates the potential of stable-isotope-informed genome-resolved metagenomics to identifyin situinterspecies metabolic cooperation within syntrophic consortia important to anaerobic waste treatment as well as global carbon cycling.« less

Authors:
ORCiD logo [1];  [2];  [3]
  1. Univ. of Waterloo, ON (Canada)
  2. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
  3. Wageningen Univ. (Netherlands)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Sciences and Engineering Research Council of Canada (NSERC); USEPA; Netherlands Organization for Scientific Research (NWO); Wageningen Institute for Environmental and Climate Research (WIMEK)
OSTI Identifier:
1626172
Grant/Contract Number:  
AC02-05CH11231; RD835567; 323009; 040.15.014
Resource Type:
Accepted Manuscript
Journal Name:
mSystems
Additional Journal Information:
Journal Volume: 4; Journal Issue: 4; Journal ID: ISSN 2379-5077
Publisher:
American Society for Microbiology
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; microbiology; anaerobic catabolic pathways; anaerobic digestion; metagenomics; methanogenesis; stable-isotope probing; syntrophy

Citation Formats

Ziels, Ryan M., Nobu, Masaru K., and Sousa, Diana Z. Elucidating Syntrophic Butyrate-Degrading Populations in Anaerobic Digesters Using Stable-Isotope-Informed Genome-Resolved Metagenomics. United States: N. p., 2019. Web. doi:10.1128/msystems.00159-19.
Ziels, Ryan M., Nobu, Masaru K., & Sousa, Diana Z. Elucidating Syntrophic Butyrate-Degrading Populations in Anaerobic Digesters Using Stable-Isotope-Informed Genome-Resolved Metagenomics. United States. https://doi.org/10.1128/msystems.00159-19
Ziels, Ryan M., Nobu, Masaru K., and Sousa, Diana Z. Tue . "Elucidating Syntrophic Butyrate-Degrading Populations in Anaerobic Digesters Using Stable-Isotope-Informed Genome-Resolved Metagenomics". United States. https://doi.org/10.1128/msystems.00159-19. https://www.osti.gov/servlets/purl/1626172.
@article{osti_1626172,
title = {Elucidating Syntrophic Butyrate-Degrading Populations in Anaerobic Digesters Using Stable-Isotope-Informed Genome-Resolved Metagenomics},
author = {Ziels, Ryan M. and Nobu, Masaru K. and Sousa, Diana Z.},
abstractNote = {Linking the genomic content of uncultivated microbes to their metabolic functions remains a critical challenge in microbial ecology. Resolving this challenge has implications for improving our management of key microbial interactions in biotechnologies such as anaerobic digestion, which relies on slow-growing syntrophic and methanogenic communities to produce renewable methane from organic waste. In this study, we combined DNA stable-isotope probing (SIP) with genome-centric metagenomics to recover the genomes of populations enriched in13C after growing on [13C]butyrate. Differential abundance analysis of recovered genomic bins across the SIP metagenomes identified two metagenome-assembled genomes (MAGs) that were significantly enriched in heavy [13C]DNA. Phylogenomic analysis assigned one MAG to the genus Syntrophomonas and the other MAG to the genus Methanothrix. Metabolic reconstruction of the annotated genomes showed that the Syntrophomonas genome encoded all the enzymes for beta-oxidizing butyrate, as well as several mechanisms for interspecies electron transfer via electron transfer flavoproteins, hydrogenases, and formate dehydrogenases. The Syntrophomonas genome shared low average nucleotide identity (<95%) with any cultured representative species, indicating that it is a novel species that plays a significant role in syntrophic butyrate degradation within anaerobic digesters. The Methanothrix genome contained the complete pathway for acetoclastic methanogenesis, indicating that it was enriched in13C from syntrophic acetate transfer. This study demonstrates the potential of stable-isotope-informed genome-resolved metagenomics to identifyin situinterspecies metabolic cooperation within syntrophic consortia important to anaerobic waste treatment as well as global carbon cycling.},
doi = {10.1128/msystems.00159-19},
journal = {mSystems},
number = 4,
volume = 4,
place = {United States},
year = {Tue Aug 06 00:00:00 EDT 2019},
month = {Tue Aug 06 00:00:00 EDT 2019}
}

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Genome-centric resolution of microbial diversity, metabolism and interactions in anaerobic digestion: Genome-centric resolution through deep metagenomics
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Prodigal: prokaryotic gene recognition and translation initiation site identification
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Evaluation of genomic high-throughput sequencing data generated on Illumina HiSeq and Genome Analyzer systems
journal, January 2011


Moderated estimation of fold change and dispersion for RNA-seq data with DESeq2
journal, December 2014


Tracking microbial colonization in fecal microbiota transplantation experiments via genome-resolved metagenomics
journal, May 2017


Evolution under Fluctuating Environments Explains Observed Robustness in Metabolic Networks
journal, August 2010


Proteomic analysis reveals metabolic and regulatory systems involved in the syntrophic and axenic lifestyle of Syntrophomonas wolfei
journal, February 2015


Membrane Complexes of Syntrophomonas wolfei Involved in Syntrophic Butyrate Degradation and Hydrogen Formation
journal, November 2016


Culture-Independent Analyses Reveal Novel Anaerolineaceae as Abundant Primary Fermenters in Anaerobic Digesters Treating Waste Activated Sludge
journal, June 2017

  • McIlroy, Simon J.; Kirkegaard, Rasmus H.; Dueholm, Morten S.
  • Frontiers in Microbiology, Vol. 8
  • DOI: 10.3389/fmicb.2017.01134