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Sunday, July 7, 2019

Genomic characterization of Nocardia seriolae strains isolated from diseased fish.

Members of the genus Nocardia are widespread in diverse environments; a wide range of Nocardia species are known to cause nocardiosis in several animals, including cat, dog, fish, and humans. Of the pathogenic Nocardia species, N. seriolae is known to cause disease in cultured fish, resulting in major economic loss. We isolated two N. seriolae strains, CK-14008 and EM15050, from diseased fish and sequenced their genomes using the PacBio sequencing platform. To identify their genomic features, we compared their genomes with those of other Nocardia species. Phylogenetic analysis showed that N. seriolae shares a common ancestor with a putative human…

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Sunday, July 7, 2019

Complete genome sequence of the novel agarolytic Catenovulum-like strain CCB-QB4

Members of the genus Catenovulum are recognized for their ability to degrade algal biomass. Here we report the complete genome of Cantenovulum–like strain CCB-QB4, an agarolytic bacterium isolated from the coastal area of Penang, Malaysia. The sequenced genome is composed of a 5,663,044?bp circular chromosome and a 208,085?bp circular plasmid. It contained 4409 protein coding and 83 RNA genes, including 62 tRNAs and 21 rRNAs. The genome of CCB-QB4 contains many agarases, which correlate with the high capacity of the strain to degrade agar. Genome sequencing of CCB-QB4 reveals gene candidates of potential interest in enzymatic industries or applications in…

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Sunday, July 7, 2019

A systematic review of the Trypanosoma cruzi genetic heterogeneity, host immune response and genetic factors as plausible drivers of chronic chagasic cardiomyopathy.

Chagas disease is a complex tropical pathology caused by the kinetoplastid Trypanosoma cruzi. This parasite displays massive genetic diversity and has been classified by international consensus in at least six Discrete Typing Units (DTUs) that are broadly distributed in the American continent. The main clinical manifestation of the disease is the chronic chagasic cardiomyopathy (CCC) that is lethal in the infected individuals. However, one intriguing feature is that only 30-40% of the infected individuals will develop CCC. Some authors have suggested that the immune response, host genetic factors, virulence factors and even the massive genetic heterogeneity of T. cruzi are…

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Sunday, July 7, 2019

Copy-number variants in clinical genome sequencing: deployment and interpretation for rare and undiagnosed disease.

Current diagnostic testing for genetic disorders involves serial use of specialized assays spanning multiple technologies. In principle, genome sequencing (GS) can detect all genomic pathogenic variant types on a single platform. Here we evaluate copy-number variant (CNV) calling as part of a clinically accredited GS test.We performed analytical validation of CNV calling on 17 reference samples, compared the sensitivity of GS-based variants with those from a clinical microarray, and set a bound on precision using orthogonal technologies. We developed a protocol for family-based analysis of GS-based CNV calls, and deployed this across a clinical cohort of 79 rare and undiagnosed…

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Sunday, July 7, 2019

The whole genome insight on condition-specific redox activity and arsenopyrite interaction promoting As-mobilization by strain Lysinibacillus sp. B2A1.

A gram-positive spore former, Lysinibacillus sp. B2A1 was isolated from a high arsenic containing groundwater of Beimen2A well, Chianan Plain area, Southwestern Taiwan. Noteworthy, in the subsurface-mimicking anoxic incubation with a Na-lactate amendment system, this isolate could interact with arsenic-source mineral arsenopyrite and enhance arsenic mobilization. Further, the isolate showed elevated levels of arsenic resistance, 200?mM and 7.5?mM for arsenate and arsenite, respectively. Lysinibacillus sp. B2A1 demonstrated condition-specific redox activities including salient oxic oxidation of arsenite and anoxic reduction of arsenate. The elevated rate of As(III) oxidation (Vmax?=?0.13 µM min-1 per 106 cells, Km?=?15.3 µM) under oxic conditions was potent.…

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Sunday, July 7, 2019

Heteroresistance to the model antimicrobial peptide polymyxin B in the emerging Neisseria meningitidis lineage 11.2 urethritis clade: mutations in the pilMNOPQ operon.

Clusters of Neisseria meningitidis (Nm) urethritis among primarily heterosexual males in multiple US cities have been attributed to a unique non-encapsulated meningococcal clade (the US Nm urethritis clade, US_NmUC) within the hypervirulent clonal complex 11. Resistance to antimicrobial peptides (AMPs) is a key feature of urogenital pathogenesis of the closely related species, Neisseria gonorrhoeae. The US_NmUC isolates were found to be highly resistant to the model AMP, polymyxin B (PmB, MICs 64-256 µg ml-1 ). The isolates also demonstrated stable subpopulations of heteroresistant colonies that showed near total resistant to PmB (MICs 384-1024 µg ml-1 ) and colistin (MIC 256 µg ml-1 ) as well as…

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Sunday, July 7, 2019

Antimicrobial, plant growth-promoting and genomic properties of the peanut endophyte Bacillus velezensis LDO2.

Peanut suffer from a number of fungal and bacterial pathogens, while plant endophytes were considered excellent candidates as biocontrol agents. In this study, the peanut endophytic bacterium LDO2 was evaluated for the potential of peanut pathogens inhibition and growth-promotion, and the genetic mechanisms were explored by genome mining. Strain LDO2 significantly inhibited the growth of peanut pathogenic fungi and pathogenic bacteria, and specifically, it showed pronounced inhibition on mycelia growth of Aspergillus flavus mycelia and caused mycelial deformity. Gene clusters responsible for antifungal metabolites (fengycin, surfactin, bacilysin) and antibacterial metabolites (butirosin, bacillaene, difficidin, macrolactin, surfactin, bacilysin) were identified. Strain LDO2…

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Sunday, July 7, 2019

Complete Genome Sequence of Bacillus cereus CC-1, A Novel Marine Selenate/Selenite Reducing Bacterium Producing Metallic Selenides Nanomaterials.

Metallic selenides nanomaterials are widely used in many fields, especially for photothermal therapy and thermoelectric devices. However, the traditional chemogenic methods are energy-intensive and environmentally unfriendly. In this study, the first complete genome data of a metallic selenides producing bacterium Bacillus cereus CC-1 was reported. This strain can not only reduce selenite and selenate into elemental selenium nanoparticles (SeNPs), but also synthesize several metallic selenides nanoparticles when adding metal ions (Pb2+, Ag+ and Bi3+) and selenite simultaneously. The size of the genome is 5,308,319 bp with 36.07% G+C content. Several putative genes responsible for heavy metal resistance, salt resistance, and selenate…

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Sunday, July 7, 2019

The complete genome sequence of Thalassospira indica PB8BT insights into adaptation to the marine environment

Thalassospira indica PB8BT was isolated from the deep water of the Indian Ocean. Here we report the complete genome sequence of type strain PB8BT, which comprises 4,701,725?bp with a G?+?C content of 54.9?mol%. We found that numerous genes related to iron acquisition, resistance, motility and chemotaxis, nitrogen, phosphorus and sulfur metabolism, and stress response. These metabolic features and related genes revealed genetic basis for the adaptation to the marine environment. The genome of T. indica PB8BT will be helpful for further insights into its adaptive evolution and ecological role in marine environment.

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Sunday, July 7, 2019

Complete genome sequence of Salinigranum rubrum GX10T, an extremely halophilic archaeon isolated from a marine solar saltern

Since the first genome of a halophilic archaeon was sequenced in 2000, microbes inhabiting hypersaline environments have been investigated largely based on genomic characteristics. Salinigranum rubrum GX10T, the type species of the genus Salinigranum belonging to the euryarchaeal family Haloferacaceae, was isolated from the brine of Gangxi marine solar saltern near Weihai, China. Similar with most members of the class Halobacteria, S. rubrum GX10T is an extreme halophile requiring at least 1.5?M NaCl for growth and 3.1?M NaCl for optimum growth. We sequenced and annotated the complete genome of S. rubrum GX10T, which was found to be 4,973,118?bp and comprise…

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Sunday, July 7, 2019

Characteristics of crude oil-degrading bacteria Gordonia iterans isolated from marine coastal in Taean sediment.

Crude oil is a major pollutant of marine and coastal ecosystems, and it causes environmental problems more seriously. It is believed ultimate and complete degradation is accomplished mainly by microorganisms. In this study, we aim to search out for bacterial strains with high ability in degrading crude oil. From sediments contaminated by the petroleum spilled in 2007, an accident in Taean, South Korea, we isolated thirty-one bacterial strains in total with potential application in crude oil contamination remediation. In terms of removal percentage after 7 days, one of the strains, Co17, showed the highest removal efficiency with 84.2% of crude oil…

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Sunday, July 7, 2019

The complexity of the Sclerotinia sclerotiorum pathosystem in soybean: virulence factors, resistance mechanisms, and their exploitation to control Sclerotinia stem rot

Sclerotinia stem rot (SSR), caused by Sclerotinia sclerotiorum, is a globally important, yield limiting disease of soybean. Progress has been made in our understanding of this pathosystem at the plant level, such as the key role of oxalic acid in disease development and the importance of cell wall-degrading enzymes and other secreted proteins. Unfortunately, advances have largely focused on the fungal side of this interaction and only provide glimpses into the plant mechanisms governing resistance to this pathogen. With the absence of commercially available resistant soybeans, chemical and cultural solutions are being used by farmers to manage SSR with limited…

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Sunday, July 7, 2019

Complete genome sequence of Euzebya sp. DY32-46, a marine Actinobacteria isolated from the Pacific Ocean

Euzebya sp. DY32-46 was isolated from seawater collected at the depth of 150?m in the eastern Pacific Ocean. The genome was sequenced and consisted of one chromosome and one plasmid pEDY32-46I with sizes of 5,799,875 and 571,580?bp as well as DNA G?+?C contents of 70.7 and 69.6%, respectively. Genomic annotation showed that fifty biosynthetic gene clusters of secondary metabolites were located in the chromosome of Euzebya sp. DY32-46, indicating that a wide variety of its natural products need to be explored. Besides, dozens of biogeochemically relevant genes found in the genome of Euzebya sp. DY32-46 revealed its ecological roles in…

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Sunday, July 7, 2019

Mobilization of Pack-CACTA transposons in Arabidopsis suggests the mechanism of gene shuffling.

Pack-TYPE transposons are a unique class of potentially mobile non-autonomous elements that can capture, merge and relocate fragments of chromosomal DNA. It has been postulated that their activity accelerates the evolution of host genes. However, this important presumption is based only on the sequences of currently inactive Pack-TYPE transposons and the acquisition of chromosomal DNA has not been recorded in real time. Analysing the DNA copy number variation in hypomethylated Arabidopsis lines, we have now for the first time witnessed the mobilization of novel Pack-TYPE elements related to the CACTA transposon family, over several plant generations. Remarkably, these elements can…

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Sunday, July 7, 2019

Paraburkholderia dokdonella sp. nov., isolated from a plant from the genus Campanula.

The novel Gram-stain-negative, rod-shaped, aerobic bacterial strain DCR-13T was isolated from a native plant belonging to the genus Campanula on Dokdo, an island in the Republic of Korea. Comparative analysis of the 16S rRNA gene sequence indicated that this strain is closely related to Paraburkholderia peleae PP52-1T (98.43% 16S rRNA gene sequence similarity), Paraburkholderia oxyphila NBRC 105797T (98.42%), Paraburkholderia sacchari IPT 101T (98.28%), Paraburkholderia mimosarum NBRC 106338T (97.80%), Paraburkholderia denitrificans KIS30-44T (97.46%), and Paraburkholderia paradise WAT (97.45%). This analysis of the 16S rRNA gene sequence also suggested that DCR-13T and the six closely related strains formed a clade within the…

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