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Sunday, October 25, 2020

AGBT PacBio Workshop: Full workshop recording

PacBio customers and thought leaders discuss the role SMRT sequencing is playing in comprehensive genomics: past, present, and future. Featuring J. Craig Venter, Gene Myers, Deanna Church, Jeong-Sun Seo and W. Richard McCombie.

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Tuesday, April 21, 2020

Tracking short-term changes in the genetic diversity and antimicrobial resistance of OXA-232-producing Klebsiella pneumoniae ST14 in clinical settings.

To track stepwise changes in genetic diversity and antimicrobial resistance in rapidly evolving OXA-232-producing Klebsiella pneumoniae ST14, an emerging carbapenem-resistant high-risk clone, in clinical settings.Twenty-six K. pneumoniae ST14 isolates were collected by the Korean Nationwide Surveillance of Antimicrobial Resistance system over the course of 1 year. Isolates were subjected to whole-genome sequencing and MIC determinations using 33 antibiotics from 14 classes.Single-nucleotide polymorphism (SNP) typing identified 72 unique SNP sites spanning the chromosomes of the isolates, dividing them into three clusters (I, II and III). The initial isolate possessed two plasmids with 18 antibiotic-resistance genes, including blaOXA-232, and exhibited resistance to 11 antibiotic…

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Tuesday, April 21, 2020

Biochemical characterization of a novel cold-adapted agarotetraose-producing a-agarase, AgaWS5, from Catenovulum sediminis WS1-A.

Although many ß-agarases that hydrolyze the ß-1,4 linkages of agarose have been biochemically characterized, only three a-agarases that hydrolyze the a-1,3 linkages are reported to date. In this study, a new a-agarase, AgaWS5, from Catenovulum sediminis WS1-A, a new agar-degrading marine bacterium, was biochemically characterized. AgaWS5 belongs to the glycoside hydrolase (GH) 96 family. AgaWS5 consists of 1295 amino acids (140 kDa) and has the 65% identity to an a-agarase, AgaA33, obtained from an agar-degrading bacterium Thalassomonas agarivorans JAMB-A33. AgaWS5 showed the maximum activity at a pH and temperature of 8 and 40 °C, respectively. AgaWS5 showed a cold-tolerance, and…

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Tuesday, April 21, 2020

Schizophrenia risk variants influence multiple classes of transcripts of sorting nexin 19 (SNX19).

Genome-wide association studies (GWAS) have identified many genomic loci associated with risk for schizophrenia, but unambiguous identification of the relationship between disease-associated variants and specific genes, and in particular their effect on risk conferring transcripts, has proven difficult. To better understand the specific molecular mechanism(s) at the schizophrenia locus in 11q25, we undertook cis expression quantitative trait loci (cis-eQTL) mapping for this 2 megabase genomic region using postmortem human brain samples. To comprehensively assess the effects of genetic risk upon local expression, we evaluated multiple transcript features: genes, exons, and exon-exon junctions in multiple brain regions-dorsolateral prefrontal cortex (DLPFC), hippocampus,…

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Tuesday, April 21, 2020

Draft Genome Sequence of Streptomyces sp. Strain RFCAC02, Isolated from the Gut Microflora of the Pacific Chub Mackerel Scomber japonicus peruanus.

A new strain of Streptomyces sp., strain RFCAC02, was isolated from the gut of the Pacific chub mackerel Scomber japonicus peruanus This strain produces a variety of secondary metabolites. Further bioinformatic analysis revealed the presence of biosynthetic gene clusters putatively coding for compounds related to the polycyclic tetramate macrolactams (PTMs).Copyright © 2019 Serrano et al.

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Tuesday, April 21, 2020

Crustacean Genome Exploration Reveals the Evolutionary Origin of White Spot Syndrome Virus.

White spot syndrome virus (WSSV) is a crustacean-infecting, double-stranded DNA virus and is the most serious viral pathogen in the global shrimp industry. WSSV is the sole recognized member of the family Nimaviridae, and the lack of genomic data on other nimaviruses has obscured the evolutionary history of WSSV. Here, we investigated the evolutionary history of WSSV by characterizing WSSV relatives hidden in host genomic data. We surveyed 14 host crustacean genomes and identified five novel nimaviral genomes. Comparative genomic analysis of Nimaviridae identified 28 “core genes” that are ubiquitously conserved in Nimaviridae; unexpected conservation of 13 uncharacterized proteins highlighted…

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Tuesday, April 21, 2020

Information about variations in multiple copies of bacterial 16S rRNA genes may aid in species identification.

Variable region analysis of 16S rRNA gene sequences is the most common tool in bacterial taxonomic studies. Although used for distinguishing bacterial species, its use remains limited due to the presence of variable copy numbers with sequence variation in the genomes. In this study, 16S rRNA gene sequences, obtained from completely assembled whole genome and Sanger electrophoresis sequencing of cloned PCR products from Serratia fonticola GS2, were compared. Sanger sequencing produced a combination of sequences from multiple copies of 16S rRNA genes. To determine whether the variant copies of 16S rRNA genes affected Sanger sequencing, two ratios (5:5 and 8:2)…

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Tuesday, April 21, 2020

Distribution and Genetic Diversity of Genes Involved in Quorum Sensing and Prodigiosin Biosynthesis in the Complete Genome Sequences of Serratia marcescens.

Quorum sensing is a cell density-dependent regulation of gene expression. N-acyl-l-homoserine lactone (AHL) is a major quorum-sensing signaling molecule in gram-negative bacteria and synthesized by the LuxI family protein. The genus Serratia is known as a producer of the red pigment, prodigiosin, whose biosynthesis is dependent on the pig gene cluster. Some Serratia strains regulate prodigiosin production via AHL-mediated quorum sensing, whereas there is red-pigmented Serratia strains without quorum-sensing system. In addition, nonpigmented Serratia marcescens, which does not produce prodigiosin, has also been isolated from natural and clinical environments. In this study, we aim to reveal the distribution and genetic…

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Tuesday, April 21, 2020

Complete genome sequence of a novel bacteriophage, PBKP05, infecting Klebsiella pneumoniae.

An increasing number of Klebsiella pneumoniae isolates have been found to be multi-drug resistant. A novel bacteriophage, PBKP05, which infects K. pneumoniae, was isolated and characterized. It has a linear double-stranded DNA genome of 30,240 base pairs in length. Its G+C content is 53%, and 47 putative open reading frames are functionally annotated. This phage can be a candidate material for phage therapy.

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Tuesday, April 21, 2020

Draft genome sequence of Streptococcus sp. strain NM isolated from head and neck cancer patients

Streptococcus sp. strain NM belonging to Firmicutes was isolated from head and neck cancer patients. Here, we report the draft genome sequence of strain NM with a size of approximately 1.90 Mbp and a mean G+C content of 39.3%. The draft genome included 1,845 coding sequences, and 12 ribosomal RNA and 58 transfer RNA genes. In the draft genome, genes involved in the antimicrobial resistance, hemolysis and defense system have been identified.

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Tuesday, April 21, 2020

Biomimetic hydroxyapatite nanocrystals are an active carrier for Salmonella bacteriophages.

The use of bacteriophages represents a valid alternative to conventional antimicrobial treatments, overcoming the widespread bacterial antibiotic resistance phenomenon. In this work, we evaluated whether biomimetic hydroxyapatite (HA) nanocrystals are able to enhance some properties of bacteriophages. The final goal of this study was to demonstrate that biomimetic HA nanocrystals can be used for bacteriophage delivery in the context of bacterial infections, and contribute – at the same time – to enhance some of the biological properties of the same bacteriophages such as stability, preservation, antimicrobial activity, and so on.Phage isolation and characterization were carried out by using Mitomycin C…

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Tuesday, April 21, 2020

The complete mitochondrial genome of the New Zealand parasitic roundworm Haemonchus contortus (Trichostrongyloidea: Haemonchidae) field strain NZ_Hco_NP

The complete mitochondrial genome of the New Zealand parasitic nematode Haemonchus contortus field strain NZ_Hco_NP was sequenced and annotated. The 14,001bp-long mitogenome contains 12 protein-coding genes (atp8 gene missing), two ribosomal RNAs, 22 transfer RNAs, and a 583bp non- coding region. Phylogenetic analysis showed that H. contortus NZ_Hco_NP forms a monophyletic clus- ter with the remaining three Haemonchidae species, and further illustrates the high levels of diversity and gene flow among Trichostrongylidae.

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Tuesday, April 21, 2020

Genome characterization of an extensively drug-resistant Streptococcus pneumoniae serotype 11A strain.

In this study, the whole genome sequences of two Streptococcus pneumoniae clinical isolates from South Korea were determined and compared. They were found to be the same serotype (11?A) and multilocus sequence typing analysis showed that they are single-locus variants (SLVs; ST8279 and ST166) of each other, differing at one allele (aroE). However, the ST8279 strain is extensively drug-resistant (XDR) whereas the ST166 strain is not. The genome of the XDR strain is very similar in structure to that of two previously reported genomes, AP200 (11?A:ST62) and 70585 (5:ST5803); however, some regions were inverted and there were some exogenous regions…

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Tuesday, April 21, 2020

Evolution of Antibiotic Synthesis Gene Clusters in the Streptomyces globisporus TFH56, Isolated from Tomato Flower.

Streptomyces species are known to produce various bioactive metabolites that can prevent plant diseases. Previously, the Streptomyces strain TFH56 was found to inhibit the gray mold pathogen, Botrytis cinerea, in tomato flower. In this study, the genome sequence of strain TFH56 was acquired using the Pacific Biosciences RS II platform. Three linear sequences (7.67 Mbp in total) were obtained. Based on average nucleotide identity, strain TFH56 was classified as Streptomyces globisporus, which is consistent with the presence of a linear chromosome and linear plasmids. Moreover, as with other examples of S. globisporus, the genome of strain TFH56 included a caryolan-1-ol synthase…

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