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• W3136895026 abstract "Abstract Background There is a dearth of sequenced and closed microbial genomes from environments that exceed > 500 m below level terrestrial surface. Coupled with even fewer cultured isolates, study and understanding of how life endures in the extreme oligotrophic subsurface environments is greatly hindered. Using a de novo hybrid assembly of Illumina and Oxford Nanopore sequences we produced a circular genome with corresponding methylome profile of the recently characterized thermophilic, anaerobic, and fumarate-respiring subsurface bacterium, Thermanaerosceptrum fracticalcis, strain DRI-13 T to understand how this microorganism survives the deep subsurface. Results The hybrid assembly produced a single circular genome of 3.8 Mb in length with an overall GC content of 45%. Out of the total 4022 annotated genes, 3884 are protein coding, 87 are RNA encoding genes, and the remaining 51 genes were associated with regulatory features of the genome including riboswitches and T-box leader sequences. Approximately 24% of the protein coding genes were hypothetical. Analysis of strain DRI-13 T genome revealed: 1) energy conservation by bifurcation hydrogenase when growing on fumarate, 2) four novel bacterial prophages, 3) methylation profile including 76.4% N6-methyladenine and 3.81% 5-methylcytosine corresponding to novel DNA methyltransferase motifs. As well a cluster of 45 genes of unknown protein families that have enriched DNA mCpG proximal to the transcription start sites, and 4) discovery of a putative core of bacteriophage exclusion (BREX) genes surrounded by hypothetical proteins, with predicted functions as helicases, nucleases, and exonucleases. Conclusions The de novo hybrid assembly of strain DRI-13 T genome has provided a more contiguous and accurate view of the subsurface bacterium T. fracticalcis, strain DRI-13 T . This genome analysis reveals a physiological focus supporting syntrophy, non-homologous double stranded DNA repair, mobility/adherence/chemotaxis, unique methylome profile/recognized motifs, and a BREX defense system. The key to microbial subsurface survival may not rest on genetic diversity, but rather through specific syntrophy niches and novel methylation strategies." @default.
• W3136895026 created "2021-03-29" @default.
• W3136895026 creator A5033929432 @default.
• W3136895026 creator A5045499577 @default.
• W3136895026 creator A5085871934 @default.
• W3136895026 date "2021-03-23" @default.
• W3136895026 modified "2023-10-07" @default.
• W3136895026 title "Hybrid genome de novo assembly with methylome analysis of the anaerobic thermophilic subsurface bacterium Thermanaerosceptrum fracticalcis strain DRI-13T" @default.
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• W3136895026 doi "https://doi.org/10.1186/s12864-021-07535-z" @default.
• W3136895026 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7988955" @default.
• W3136895026 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33757423" @default.
• W3136895026 hasPublicationYear "2021" @default.
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