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Tuesday, June 1, 2021

Comparative genome analysis of Clavibacter michiganensis subsp. michiganensis strains provides insights into genetic diversity and virulence.

Clavibacter michiganensis subsp. michiganensis (Cmm) is a gram positive actinomycete, causing bacterial canker of tomato (Solanum lycopersicum) a disease that can cause significant losses in tomato production. In this study, we determined the complete genome sequence of 13 California Cmm strains and one saprophytic Clavibacter strain using a combination of Ilumina and PacBio sequencing. The California Cmm strains have genome size (3.2 -3.3 mb) similar to the reference strain NCPPB382 (3.3 mb) with =98% sequence identity. Cmm strains from California share =92% genes (8-10% are noble genes) with the reference Cmm strain NCPPB382. Despite this similarity, we detected significant alternatives…

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Tuesday, June 1, 2021

The “Art” of shotgun sequencing

2015 SMRT Informatics Developers Conference Presentation Slides: Jason Chin of PacBio highlighted some of the challenges for shotgun assembly while suggesting some potential solutions to obtain diploid assemblies, including the FALCON method.

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Tuesday, June 1, 2021

Best practices for diploid assembly of complex genomes using PacBio: A case study of Cascade Hops

A high quality reference genome is an essential resource for plant and animal breeding and functional and evolutionary studies. The common hop (Humulus lupulus, Cannabaceae) is an economically important crop plant used to flavor and preserve beer. Its genome is large (flow cytometrybased estimates of diploid length >5.4Gb1), highly repetitive, and individual plants display high levels of heterozygosity, which make assembly of an accurate and contiguous reference genome challenging with conventional short-read methods. We present a contig assembly of Cascade Hops using PacBio long reads and the diploid genome assembler, FALCON-Unzip2. The assembly has dramatically improved contiguity and completeness over…

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Friday, February 5, 2021

Movie: The new biology part IV – food & conclusion

Part IV of The New Biology documentary. This documentary film features the wave of cutting-edge technologies that now provide the opportunity to create predictive models of living systems, and gain wisdom about the fundamental nature of life itself. The potential impact for humanity is immense: from fighting complex diseases such as cancer, enabling proactive surveillance of virulent pathogens, and increasing food crop production.

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Friday, February 5, 2021

Movie: The new biology part II – cancer

Part II of The New Biology documentary. This documentary film features the wave of cutting-edge technologies that now provide the opportunity to create predictive models of living systems, and gain wisdom about the fundamental nature of life itself. The potential impact for humanity is immense: from fighting complex diseases such as cancer, enabling proactive surveillance of virulent pathogens, and increasing food crop production.

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Friday, February 5, 2021

Movie: The new biology part III – infectious disease

Part III of The New Biology documentary. This documentary film features the wave of cutting-edge technologies that now provide the opportunity to create predictive models of living systems, and gain wisdom about the fundamental nature of life itself. The potential impact for humanity is immense: from fighting complex diseases such as cancer, enabling proactive surveillance of virulent pathogens, and increasing food crop production.

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Friday, February 5, 2021

Video: Overview of SMRT technology

PacBio’s SMRT technology harnesses the natural process of DNA replication, which is a highly efficient and accurate process. Our SMRT technology enables the observation of DNA synthesis as it occurs in real time.

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Friday, February 5, 2021

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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Friday, February 5, 2021

ASHG PacBio Workshop: Amplicon SMRT Sequencing applications in human genetics

In this ASHG workshop presentation, Stuart Scott of the Icahn School of Medicine at Mount Sinai, presented on using the PacBio system for amplicon sequencing in pharmacogenomics and clinical genomics workflows. Accurate, phased amplicon sequence for the CYP2D6 gene, for example, has allowed his team to reclassify up to 20% of samples, providing data that’s critical for drug metabolism and dosing. In clinical genomics, Scott presented several case studies illustrating the utility of highly accurate, long-read sequencing for assessing copy number variants and for confirming a suspected medical diagnosis in rare disease patients. He noted that the latest Sequel System…

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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

Benchmarking Transposable Element Annotation Methods for Creation of a Streamlined, Comprehensive Pipeline

Sequencing technology and assembly algorithms have matured to the point that high-quality de novo assembly is possible for large, repetitive genomes. Current assemblies traverse transposable elements (TEs) and allow for annotation of TEs. There are numerous methods for each class of elements with unknown relative performance metrics. We benchmarked existing programs based on a curated library of rice TEs. Using the most robust programs, we created a comprehensive pipeline called Extensive de-novo TE Annotator (EDTA) that produces a condensed TE library for annotations of structurally intact and fragmented elements. EDTA is open-source and freely available: https://github.com/oushujun/EDTA.List of abbreviationsTETransposable ElementsLTRLong Terminal…

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Tuesday, April 21, 2020

Complete Genome Sequence of Leuconostoc kimchii Strain NKJ218, Isolated from Homemade Kimchi.

Leuconostoc kimchii strain NKJ218 was isolated from homemade kimchi in South Korea. The whole genome was sequenced using the PacBio RS II and Illumina NovoSeq 6000 platforms. Here, we report a genome sequence of strain NKJ218, which consists of a 1.9-Mbp chromosome and three plasmid contigs. A total of 2,005 coding sequences (CDS) were predicted, including 1,881 protein-coding sequences.Copyright © 2019 Jung et al.

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Tuesday, April 21, 2020

Diversification and Evolution of Vancomycin-Resistant Enterococcus faecium during Intestinal Domination.

Vancomycin-resistant Enterococcus faecium (VRE) is a leading cause of hospital-acquired infections. This is particularly true in immunocompromised patients, where the damage to the microbiota caused by antibiotics can lead to VRE domination of the intestine, increasing a patient’s risk for bloodstream infection. In previous studies we observed that the intestinal domination by VRE of patients hospitalized to receive allogeneic bone marrow transplantation can persist for weeks, but little is known about subspecies diversification and evolution during prolonged domination. Here we combined a longitudinal analysis of patient data and in vivo experiments to reveal previously unappreciated subspecies dynamics during VRE domination…

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