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Tuesday, April 21, 2020

Insights into the bacterial species and communities of a full-scale anaerobic/anoxic/oxic wastewater treatment plant by using third-generation sequencing.

For the first time, full-length 16S rRNA sequencing method was applied to disclose the bacterial species and communities of a full-scale wastewater treatment plant using an anaerobic/anoxic/oxic (A/A/O) process in Wuhan, China. The compositions of the bacteria at phylum and class levels in the activated sludge were similar to which revealed by Illumina Miseq sequencing. At genus and species levels, third-generation sequencing showed great merits and accuracy. Typical functional taxa classified to ammonia-oxidizing bacteria (AOB), nitrite-oxidizing bacteria (NOB), denitrifying bacteria (DB), anaerobic ammonium oxidation bacteria (ANAMMOXB) and polyphosphate-accumulating organisms (PAOs) were presented, which were Nitrosomonas (1.11%), Nitrospira (3.56%), Pseudomonas (3.88%),…

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Tuesday, April 21, 2020

A microbial factory for defensive kahalalides in a tripartite marine symbiosis.

Chemical defense against predators is widespread in natural ecosystems. Occasionally, taxonomically distant organisms share the same defense chemical. Here, we describe an unusual tripartite marine symbiosis, in which an intracellular bacterial symbiont (“Candidatus Endobryopsis kahalalidefaciens”) uses a diverse array of biosynthetic enzymes to convert simple substrates into a library of complex molecules (the kahalalides) for chemical defense of the host, the alga Bryopsis sp., against predation. The kahalalides are subsequently hijacked by a third partner, the herbivorous mollusk Elysia rufescens, and employed similarly for defense. “Ca E. kahalalidefaciens” has lost many essential traits for free living and acts as a…

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Tuesday, April 21, 2020

Complete genome sequence of Bradymonas sediminis FA350T, the first representative of the order Bradymonadales

Bradymonas sediminis FA350T (=DSM 28820T?=?CICC 10904T) is a Gram-negative, rod-shaped and facultatively anaerobic bacterium isolated from coastal sediments from the Xiaoshi Island, Weihai, China. Phylogenetic analysis based on 16S rRNA gene sequences revealed that that strain FA350T belonged to a novel bacterial order in the class Deltaproteobacteria. Then, based on polyphasic taxonomy analyses, a novel order Bradymonadales and a novel family Bradymonadaceae were proposed and validly published. Here, we reported the complete genome of this strain; the genome is 5,045,683?bp in size, has a GC content of 61.1% and contains 3992 predicted genes. Strain FA350T featured being able to prey…

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Tuesday, April 21, 2020

Confident phylogenetic identification of uncultured prokaryotes through long read amplicon sequencing of the 16S-ITS-23S rRNA operon.

Amplicon sequencing of the 16S rRNA gene is the predominant method to quantify microbial compositions and to discover novel lineages. However, traditional short amplicons often do not contain enough information to confidently resolve their phylogeny. Here we present a cost-effective protocol that amplifies a large part of the rRNA operon and sequences the amplicons with PacBio technology. We tested our method on a mock community and developed a read-curation pipeline that reduces the overall read error rate to 0.18%. Applying our method on four environmental samples, we captured near full-length rRNA operon amplicons from a large diversity of prokaryotes. The…

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Tuesday, April 21, 2020

Petunia-and Arabidopsis-Specific Root Microbiota Responses to Phosphate Supplementation

Phosphorus (P) is a limiting element for plant growth. Several root microbes, including arbuscular mycorrhizal fungi (AMF), have the capacity to improve plant nutrition and their abundance is known to depend on P fertility. However, how complex root-associated bacterial and fungal communities respond to various levels of P supplementation remains ill-defined. Here we investigated the responses of the root-associated bacteria and fungi to varying levels of P supply using 16S rRNA gene and internal transcribed spacer amplicon sequencing. We grew Petunia, which forms symbiosis with AMF, and the nonmycorrhizal model species Arabidopsis as a control in a soil that is…

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Tuesday, April 21, 2020

Development of CRISPR-Cas systems for genome editing and beyond

The development of clustered regularly interspaced short-palindromic repeat (CRISPR)-Cas systems for genome editing has transformed the way life science research is conducted and holds enormous potential for the treatment of disease as well as for many aspects of biotech- nology. Here, I provide a personal perspective on the development of CRISPR-Cas9 for genome editing within the broader context of the field and discuss our work to discover novel Cas effectors and develop them into additional molecular tools. The initial demonstra- tion of Cas9-mediated genome editing launched the development of many other technologies, enabled new lines of biological inquiry, and motivated…

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Monday, March 30, 2020

Webinar: A HiFi view – Sequencing the gut microbiome with highly accurate long reads

In this webinar, Dr. Ashby gives attendees a brief update on PacBio’s metagenomics solutions on the Sequel II System. Then, Dr. Ma, University of Maryland School of Medicine, discusses her work using long read sequencing to identify high-resolution microbial biomarkers associated with leaky gut syndrome in premature infants. Finally, Dr. Weinstock, The Jackson Laboratory, talks about the potential of highly accurate long reads to enable strain-level resolution of the human gut microbiome by resolving intraspecies variation in multiple copies of the 16S gene.

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Wednesday, February 26, 2020

Metagenomes of native and electrode-enriched microbial communities from the Soudan Iron Mine.

Despite apparent carbon limitation, anoxic deep subsurface brines at the Soudan Underground Iron Mine harbor active microbial communities. To characterize these assemblages, we performed shotgun metagenomics of native and enriched samples. Following enrichment on poised electrodes and long read sequencing, we recovered from the metagenome the closed, circular genome of a novel Desulfuromonas sp. with remarkable genomic features that were not fully resolved by short read assembly alone. This organism was essentially absent in unenriched Soudan communities, indicating that electrodes are highly selective for putative metal reducers. Native community metagenomes suggest that carbon cycling is driven by methyl-C1 metabolism, in…

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