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Thursday, August 27, 2020

Case Study: Sequencing an historic bacterial collection for the future

The UK’s National Collection of Type Cultures (NCTC) is a unique collection of more than 5,000 expertly preserved and authenticated bacterial cultures, many of historical significance. Founded in 1920, NCTC is the longest established collection of its type anywhere in the world, with a history of its own that has reflected — and contributed to — the evolution of microbiology for more than 100 years.

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Friday, July 31, 2020

Webinar: SMRT Sequencing applications for human genomics and medicine

In this webinar, Adam Ameur of SciLifeLab at Uppsala University shares how he uses Single Molecule, Real-Time (SMRT) Sequencing applications for medical diagnostics and human genetics research, including sequencing of single genes and de novo assembly of human genomes as well as a new method for detection of CRISPR-Cas9 off-targets.

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Wednesday, May 13, 2020

Webinar: Understanding SARS-CoV-2 and host immune response to COVID-19 with PacBio sequencing

Studying microbial genomics and infectious disease? Learn how the PacBio Sequel II System can help advance your research, with first-hand perspectives from scientists who are investigating SARS-CoV-2 and COVID-19. In this webinar, Melissa Laird-Smith (Mt. Sinai School of Medicine) discusses her work evaluating the impact of host immune restriction in health and disease with high resolution HLA typing. She is joined by Corey Watson (University of Louisville School of Medicine) who talks about overcoming complexity to elucidate the role of IGH haplotype diversity in antibody-mediated immunity. Hosted by Meredith Ashby, Director of Microbial Genomics at PacBio. Access additional PacBio resources…

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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

Identification and characterization of chicken circovirus from commercial broiler chickens in China.

Circoviruses are found in many species, including mammals, birds, lower vertebrates and invertebrates. To date, there are no reports of circovirus-induced diseases in chickens. In this study, we identified a new strain of chicken circovirus (CCV) by PacBio third-generation sequencing samples from chickens with acute gastroenteritis in a Shandong commercial broiler farm in China. The complete genome of CCV was verified by inverse PCR. Genomic analysis revealed that CCV codes two inverse open reading frames (ORFs), and a potential stem-loop structure was present at the 5′ end with a structure typical of a circular virus. Phylogenetic tree analysis showed that…

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Tuesday, April 21, 2020

Potent LpxC Inhibitors with In Vitro Activity Against Multi-Drug Resistant Pseudomonas aeruginosa.

New drugs with novel mechanisms of resistance are desperately needed to address both community and nosocomial infections due to Gram-negative bacteria. One such potential target is LpxC, an essential enzyme that catalyzes the first committed step of Lipid A biosynthesis. Achaogen conducted an extensive research campaign to discover novel LpxC inhibitors with activity against Pseudomonas aeruginosa We report here the in vitro antibacterial activity and pharmacodynamics of ACHN-975, the only molecule from these efforts and the first ever LpxC inhibitor to be evaluated in Phase 1 clinical trials. In addition, we describe the profile of three additional LpxC inhibitors that…

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Tuesday, April 21, 2020

Evolution of a 72-kb cointegrant, conjugative multiresistance plasmid from early community-associated methicillin-resistant Staphylococcus aureus isolates.

Horizontal transfer of plasmids encoding antimicrobial-resistance and virulence determinants has been instrumental in Staphylococcus aureus evolution, including the emergence of community-associated methicillin-resistant S. aureus (CA-MRSA). In the early 1990s the first CA-MRSA isolated in Western Australia (WA), WA-5, encoded cadmium, tetracycline and penicillin-resistance genes on plasmid pWBG753 (~30 kb). WA-5 and pWBG753 appeared only briefly in WA, however, fusidic-acid-resistance plasmids related to pWBG753 were also present in the first European CA-MRSA at the time. Here we characterized a 72-kb conjugative plasmid pWBG731 present in multiresistant WA-5-like clones from the same period. pWBG731 was a cointegrant formed from pWBG753 and a…

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Tuesday, April 21, 2020

An Outbreak of KPC-Producing Klebsiella pneumoniae Linked with an Index Case of Community-Acquired KPC-Producing Isolate: Epidemiological Investigation and Whole Genome Sequencing Analysis.

Aims: A hospital outbreak of Klebsiella pneumoniae carbapenemase (KPC)-producing Klebsiella pneumoniae (KPN) linked with an index case of community-acquired infection occurred in an urban tertiary care hospital in Seoul, South Korea. Therefore, we performed an outbreak investigation and whole genome sequencing (WGS) analysis to trace the outbreak and investigate the molecular characteristics of the isolates. Results: From October 2014 to January 2015, we identified a cluster of three patients in the neurosurgery ward with sputum cultures positive for carbapenem-resistant KPN. An epidemiological investigation, including pulsed-field gel electrophoresis analysis was performed to trace the origins of this outbreak. The index patient’s…

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Tuesday, April 21, 2020

Transcriptional initiation of a small RNA, not R-loop stability, dictates the frequency of pilin antigenic variation in Neisseria gonorrhoeae.

Neisseria gonorrhoeae, the sole causative agent of gonorrhea, constitutively undergoes diversification of the Type IV pilus. Gene conversion occurs between one of the several donor silent copies located in distinct loci and the recipient pilE gene, encoding the major pilin subunit of the pilus. A guanine quadruplex (G4) DNA structure and a cis-acting sRNA (G4-sRNA) are located upstream of the pilE gene and both are required for pilin antigenic variation (Av). We show that the reduced sRNA transcription lowers pilin Av frequencies. Extended transcriptional elongation is not required for Av, since limiting the transcript to 32 nt allows for normal…

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Tuesday, April 21, 2020

Chromosome-level reference genome of X12, a highly virulent race of the soybean cyst nematode Heterodera glycines.

Soybean cyst nematode (SCN, Heterodera glycines) is a major pest of soybean that is spreading across major soybean production regions worldwide. Increased SCN virulence has recently been observed in both the United States and China. However, no study has reported a genome assembly for H. glycines at the chromosome scale. Herein, the first chromosome-level reference genome of X12, an unusual SCN race with high infection ability, is presented. Using whole-genome shotgun (WGS) sequencing, PacBio sequencing, Illumina paired-end sequencing, 10X Genomics linked reads and high-throughput chromatin conformation capture (Hi-C) genome scaffolding techniques, a 141.01-Mb assembled genome was obtained with scaffold and…

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Tuesday, April 21, 2020

Complete genome sequence of Paracoccus sp. Arc7-R13, a silver nanoparticles synthesizing bacterium isolated from Arctic Ocean sediments

Paracoccus sp. Arc7-R13, a silver nanoparticles (AgNPs) synthesizing bacterium, was isolated from Arctic Ocean sediment. Here we describe the complete genome of Paracoccus sp. Arc7-R13. The complete genome contains 4,040,012?bp with 66.66?mol%?G?+?C content, including one circular chromosome of 3,231,929?bp (67.45?mol%?G?+?C content), and eight plasmids with length ranging from 24,536?bp to 199,685?bp. The genome contains 3835 protein-coding genes (CDSs), 49 tRNA genes, as well as 3 rRNA operons as 16S-23S-5S rRNA. Based on the gene annotation and Swiss-Prot analysis, a total of 15 genes belonging to 11 kinds, including silver exporting P-type ATPase (SilP), alkaline phosphatase, nitroreductase, thioredoxin reductase, NADPH dehydrogenase…

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