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Genome-Enabled Resolution of Archaeal Diversity in Methane-Cycling Wetlands
Başlık:
Genome-Enabled Resolution of Archaeal Diversity in Methane-Cycling Wetlands
Yazar:
Narrowe, Adrienne Beth, author.
ISBN:
9780438004344
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (160 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Christopher S. Miller Committee members: Michael J. Greene; Katerina Kechris; Catherine Lozupone; Annika C. Mosier; Timberley M. Roane.
Özet:
As the only known organisms that can produce methane, archaea are key players in the global methane cycle. Despite their critical role, archaea are often understudied compared to bacteria. With recent advances in DNA sequencing, we are discovering entire archaeal phyla, new members within known archaeal groups, and unexpected metabolic potential within the archaeal domain. Temperate freshwater wetlands are among the environments needing additional study of the archaeal community. Such mid-latitude, naturally occurring freshwater wetlands are estimated to be large contributors to global methane cycling, but the composition and function of their microbial communities are not well incorporated in global models of methane emissions.
Here, using multiple methods of high-throughput DNA sequencing, we describe the microbial community structure and functional potential in Old Woman Creek (OH, USA), a model freshwater wetland, finding genomic, metabolic, and habitat diversity within and among archaeal groups that would not have been predicted based on previous knowledge. First, we developed a new domain-specific sequencing protocol, producing a more highly resolved archaeal community profile than was achievable with existing methods. This deep view of the archaeal community demonstrated that highly diverse assemblages of methane-cycling and non methane-cycling archaea are present across the wetland; with habitat distributions that suggest environmentally defined niches. Next, using metagenomic sequencing to reconstruct archaeal genomes from the wetland soils, we identified multiple phylogenetically conserved evolutionary anomalies in the complement of fundamental information processing genes among the recently described Asgard archaea. Finally, further genomic reconstructions identified metabolic features among the Bathyarchaeota, which correspond to their intra-population habitat specificity we identified in the initial community profile. Metabolic reconstructions highlight broad potential for Bathyarchaeota to play key roles in facilitating methane production by providing substrate to the methanogenic archaea, and, surprisingly, members of this group may themselves contribute directly to methane cycling in this system. These findings offer additional insight into the evolution, diversity, and function of multiple archaeal groups within a model freshwater wetland, and provide the foundation for further study to better understand factors controlling methane cycling.
Notlar:
School code: 0765
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(680538.1) | 680538-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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