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Borg extrachromosomal elements of methane-oxidizing archaea have conserved and expressed genetic repertoires

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [6];  [7];  [8];  [4];  [2];  [2];  [2];  [2];  [2];  [2];  [4];  [9]
  1. Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Innovative Genomics Institute, Berkeley, CA (United States)
  2. Oxford Nanopore Technologies, Inc., New York, NY (United States)
  3. Univ. of California, Berkeley, CA (United States)
  4. Innovative Genomics Institute, Berkeley, CA (United States)
  5. Yale Univ., New Haven, CT (United States)
  6. Universite de Paris Cité, Paris (France)
  7. Queensland University of Technology (QUT), Woolloongabba, QLD (Australia). Centre for Microbiome Research
  8. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  9. Innovative Genomics Institute, Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Monash Univ., Melbourne, VIC (Australia)

Borgs are huge extrachromosomal elements (ECE) of anaerobic methane-consuming “Candidatus Methanoperedens” archaea. Here, we used nanopore sequencing to validate published complete genomes curated from short reads and to reconstruct new genomes. 13 complete and four near-complete linear genomes share 40 genes that define a largely syntenous genome backbone. We use these conserved genes to identify new Borgs from peatland soil and to delineate Borg phylogeny, revealing two major clades. Remarkably, Borg genes encoding nanowire-like electron-transferring cytochromes and cell surface proteins are more highly expressed than those of host Methanoperedens, indicating that Borgs augment the Methanoperedens activity in situ. We reconstructed the first complete 4.00 Mbp genome for a Methanoperedens that is inferred to be a Borg host and predicted its methylation motifs, which differ from pervasive TC and CC methylation motifs of the Borgs. Thus, methylation may enable Methanoperedens to distinguish their genomes from those of Borgs. Very high Borg to Methanoperedens ratios and structural predictions suggest that Borgs may be capable of encapsulation. The findings clearly define Borgs as a distinct class of ECE with shared genomic signatures, establish their diversification from a common ancestor with genetic inheritance, and raise the possibility of periodic existence outside of host cells.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2394747
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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