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Tuesday, April 21, 2020

Paenibacillus albus sp. nov., a UV radiation-resistant bacterium isolated from soil in Korea.

A novel Gram-stain-positive, motile, white color and endospore-forming bacterium, designated 18JY67-1T, was isolated from soil in Jeju Island, Korea. The strain grow at 15-42 °C (optimum 30 °C) in R2A medium at pH (6.0-9.5) (optimum 7.5). Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 18JY67-1T formed a distinct lineage within the family Paenibacillaceae (order Bacillales, class Bacilli), and was closely related to Paenibacillus rhizoryzae (KP675984; 96.9% 16S rRNA gene sequence similarity). The major cellular fatty acids of the strain 18JY67-1T were C16:0 and anteiso-C15:0. The predominant respiratory quinones were MK-7. The major polar lipid was identified as diphosphatidylglycerol. On…

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Tuesday, April 21, 2020

Complete Genome Sequence of a Parabacteroides distasonis Strain (CavFT hAR46) Isolated from a Gut Wall-Cavitating Microlesion in a Patient with Severe Crohn’s Disease.

Crohn’s disease (CD) is a chronic inflammatory bowel disease (IBD) of the digestive tract in humans. There is evidence that Parabacteroides distasonis could contribute to IBD. Here, we present the complete genome sequence of a strain designated CavFT-hAR46, which was isolated from a gut intramural cavernous fistulous tract (CavFT) microlesion in a CD patient.Copyright © 2019 Yang et al.

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Tuesday, April 21, 2020

Complete Genome Sequence of Kocuria indica CE7, Isolated from Human Skin.

Here, we report the complete genome sequence of Kocuria indica CE7, isolated from human skin. This strain possesses a 2,809-kbp chromosome and a 32-kbp plasmid with 2,507 coding sequences. In particular, the genome contains multiple genes potentially involved in adaptations in pH homeostasis and salt tolerance.Copyright © 2019 Lee et al.

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Tuesday, April 21, 2020

First Complete Genome Sequence of Haematobacter massiliensis OT1 (Chromosome and Multiple Plasmids), Isolated from Human Skin.

Haematobacter massiliensis OT1 was isolated from human skin. This strain can catabolize 4-hydroxybenzoate. Here, we present the first complete whole-genome sequence of this species, which has one chromosome (2,467 kbp) and nine plasmids (total of 1,765 kbp). The analysis of the H. massiliensis OT1 genome indicated a potential for autotrophic growth.Copyright © 2019 Lim et al.

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Tuesday, April 21, 2020

Evolution of a clade of Acinetobacter baumannii global clone 1, lineage 1 via acquisition of carbapenem- and aminoglycoside-resistance genes and dispersion of ISAba1.

Resistance to carbapenem and aminoglycoside antibiotics is a critical problem in Acinetobacter baumannii, particularly when genes conferring resistance are acquired by multiply or extensively resistant members of successful globally distributed clonal complexes, such as global clone 1 (GC1) . Here, we investigate the evolution of an expanding clade of lineage 1 of the GC1 complex via repeated acquisition of carbapenem- and aminoglycoside-resistance genes. Lineage 1 arose in the late 1970s and the Tn6168/OCL3 clade arose in the late 1990s from an ancestor that had already acquired resistance to third-generation cephalosporins and fluoroquinolones. Between 2000 and 2002, two distinct subclades have…

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Tuesday, April 21, 2020

Antarctic blackfin icefish genome reveals adaptations to extreme environments.

Icefishes (suborder Notothenioidei; family Channichthyidae) are the only vertebrates that lack functional haemoglobin genes and red blood cells. Here, we report a high-quality genome assembly and linkage map for the Antarctic blackfin icefish Chaenocephalus aceratus, highlighting evolved genomic features for its unique physiology. Phylogenomic analysis revealed that Antarctic fish of the teleost suborder Notothenioidei, including icefishes, diverged from the stickleback lineage about 77 million years ago and subsequently evolved cold-adapted phenotypes as the Southern Ocean cooled to sub-zero temperatures. Our results show that genes involved in protection from ice damage, including genes encoding antifreeze glycoprotein and zona pellucida proteins, are…

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Tuesday, April 21, 2020

Genome analysis of the rice coral Montipora capitata.

Corals comprise a biomineralizing cnidarian, dinoflagellate algal symbionts, and associated microbiome of prokaryotes and viruses. Ongoing efforts to conserve coral reefs by identifying the major stress response pathways and thereby laying the foundation to select resistant genotypes rely on a robust genomic foundation. Here we generated and analyzed a high quality long-read based ~886 Mbp nuclear genome assembly and transcriptome data from the dominant rice coral, Montipora capitata from Hawai’i. Our work provides insights into the architecture of coral genomes and shows how they differ in size and gene inventory, putatively due to population size variation. We describe a recent…

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Wednesday, February 26, 2020

Genome sequencing of microbial genomes using Single Molecule Real-time sequencing (SMRT) technology.

In the last year, high-throughput sequencing technologies have progressed from proof-of-concept to production quality. Although each technology is able to produce vast quantities of sequence information, in every case the underlying chemistry limits reads to very short lengths. We present a examining de novo assembly comparison with bacterial genome assembly varying genome size (from 3.1Mb to 7.6Mb) and different G+C contents (from 43% to 71%), respectively. We analyzed Solexa reads, 454 reads and Pacbio RS reads from Streptomyces sp. (Genome size, 7.6 Mb; G+C content, 71%), Psychrobacter sp. (Genome size, 3.5 Mb; G+C content, 43%), Salinibacterium sp. (Genome size, 3.1…

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Sunday, September 22, 2019

Characterization of the Rosellinia necatrix transcriptome and genes related to pathogenesis by single-molecule mRNA sequencing.

White root rot disease, caused by the pathogen Rosellinia necatrix, is one of the world’s most devastating plant fungal diseases and affects several commercially important species of fruit trees and crops. Recent global outbreaks of R. necatrix and advances in molecular techniques have both increased interest in this pathogen. However, the lack of information regarding the genomic structure and transcriptome of R. necatrix has been a barrier to the progress of functional genomic research and the control of this harmful pathogen. Here, we identified 10,616 novel full-length transcripts from the filamentous hyphal tissue of R. necatrix (KACC 40445 strain) using…

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Sunday, September 22, 2019

Construction of a draft reference transcripts of onion (Allium cepa) using long-read sequencing

To obtain intact and full-length RNA transcripts of onion (Allium cepa), long-read sequencing technology was first applied. Total RNAs extracted from four tissues; flowers, leaves, bulbs and roots, of red–purple and yellow-colored onions (A. cepa) were sequenced using long-read sequencing (RSII platform, P4-C2 chemistry). The 99,247 polished high-quality isoforms were produced by sequence correction processes of consensus calling, quality filtering, orientation verification, misread-nucleotide correction and dot-matrix view. The dot-matrix view was subsequently used to remove artificial inverted repeats (IRs), and resultantly 421 IRs were removed. The remaining 98,826 isoforms were condensed to 35,505 through the removal process of redundant isoforms.…

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Sunday, September 22, 2019

Long read reference genome-free reconstruction of a full-length transcriptome from Astragalus membranaceus reveals transcript variants involved in bioactive compound biosynthesis.

Astragalus membranaceus, also known as Huangqi in China, is one of the most widely used medicinal herbs in Traditional Chinese Medicine. Traditional Chinese Medicine formulations from Astragalus membranaceus have been used to treat a wide range of illnesses, such as cardiovascular disease, type 2 diabetes, nephritis and cancers. Pharmacological studies have shown that immunomodulating, anti-hyperglycemic, anti-inflammatory, antioxidant and antiviral activities exist in the extract of Astragalus membranaceus. Therefore, characterising the biosynthesis of bioactive compounds in Astragalus membranaceus, such as Astragalosides, Calycosin and Calycosin-7-O-ß-d-glucoside, is of particular importance for further genetic studies of Astragalus membranaceus. In this study, we reconstructed the…

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Sunday, September 22, 2019

The complete chloroplast genome of Chrysanthemum boreale (Asteraceae)

Chrysanthemum boreale is a perennial plant in the Asteraceae family that is native to eastern Asia and has both ornamental and herbal uses. Here, we determined the complete chloroplast genome sequence for C. boreale using long-read sequencing. The chloroplast genome was 151,012?bp and consisted of a large single copy (LSC) region (82,817?bp), a small single copy (SSC) region (18,281?bp) and two inverted repeats (IRs) (24,957?bp). It was predicted to contain 131 genes, including 87 protein-coding genes, eight rRNAs and 46 tRNAs. Phylogenetic analysis of chloroplast genomes clustered C. boreale with other Chrysanthemum and Asteraceae species.

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Sunday, September 22, 2019

Genome alterations associated with improved transformation efficiency in Lactobacillus reuteri.

Lactic acid bacteria (LAB) are one of the microorganisms of choice for the development of protein delivery systems for therapeutic purposes. Although there are numerous tools to facilitate genome engineering of lactobacilli; transformation efficiency still limits the ability to engineer their genomes. While genetically manipulating Lactobacillus reuteri ATCC PTA 6475 (LR 6475), we noticed that after an initial transformation, several LR 6475 strains significantly improved their ability to take up plasmid DNA via electroporation. Our goal was to understand the molecular basis for how these strains acquired the ability to increase transformation efficiency.Strains generated after transformation of plasmids pJP067 and…

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