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Thursday, January 7, 2021

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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Thursday, January 7, 2021

Infographic: A brief history of microbiology

Our understanding of microbiology has evolved enormously over the last 150 years. Few institutions have witnessed our collective progress more closely than the National Collection of Type Cultures (NCTC). In fact, the collection itself is a record of the many milestones microbiologists have crossed, building on the discoveries of those who came before. To date, 60% of NCTC’s historic collection now has a closed, finished reference genome, thanks to PacBio Single Molecule, Real- Time (SMRT) Sequencing. We are excited to be their partner in crossing this latest milestone on their quest to improve human and animal health by understanding the…

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Thursday, January 7, 2021

Application Brief: Single-cell RNA sequencing with HiFi reads – Best Practices

With PacBio single-cell RNA sequencing using the Iso-Seq method, you can now distinguish between alternative transcript isoforms at the single-cell level. The highly accurate long reads (HiFi reads) can span the entire 5′ to 3′ end of a transcript, allowing a high-resolution view of isoform diversity and revealing cell-to-cell heterogeneity without the need for assembly.

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Wednesday, January 6, 2021

ASHG PacBio Workshop: SMRT Sequencing as a translational research tool to investigate germline, somatic and infectious diseases

Melissa Laird Smith discussed how the Icahn School of Medicine at Mount Sinai uses long-read sequencing for translational research. She gave several examples of targeted sequencing projects run on the Sequel System including CYP2D6, phased mutations of GLA in Fabry’s disease, structural variation breakpoint validation in glioblastoma, and full-length immune profiling of TCR sequences.

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Wednesday, January 6, 2021

User Group Meeting: Sequencing chemistry & application updates

To start Day 1 of the PacBio User Group Meeting, Jonas Korlach, PacBio CSO, provides an update on the latest releases and performance metrics for the Sequel II System. The longest reads generated on this system with the SMRT Cell 8M now go beyond 175,000 bases, while maintaining extremely high accuracy. HiFi mode, for example, uses circular consensus sequencing to achieve accuracy of Q40 or even Q50.

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Wednesday, January 6, 2021

Webinar: Opportunities for using PacBio Long-read sequencing for COVID-19 research

In this Labroots webinar, Meredith Ashby, Director of Microbial Genomics at PacBio, describes the utility of highly accurate long-read sequencing, known as HiFi sequencing, to understand the SARs-CoV-2 viral genome. HiFi sequencing enables mutation phasing and rare variant detection to understand viral stability and mutation rates, as well as providing insights into viral population structure for monitoring viral evolution. Ashby also shares how HiFi sequencing can be used to explore the host immune response to COVID-19, specifically by providing full-length sequencing of the B cell repertoire, IGH locus and HLA genes. Access additional COVID-19 Sequencing Tools and Resources.

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Wednesday, January 6, 2021

ASHG PacBio Workshop: Latest product and application updates

In this ASHG 2020 PacBio Workshop Jonas Korlach, CSO, shares how the new PacBio Sequel IIe System makes highly accurate long-read sequencing easy and affordable so?all scientists can gain comprehensive views of human genomes and transcriptomes. He goes on to provide updates on the applications including human WGS for variant detection, de novo genome assembly, single-cell full-length RNA sequencing, and targeted sequencing using PCR and No-Amp methods.

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Tuesday, December 22, 2020

Characterizing haplotype diversity at the immunoglobulin heavy chain locus across human populations using novel long-read sequencing and assembly approaches

The human immunoglobulin heavy chain locus (IGH) remains among the most understudied regions of the human genome. Recent efforts have shown that haplotype diversity within IGH is elevated and exhibits population specific patterns; for example, our re-sequencing of the locus from only a single chromosome uncovered >100 Kb of novel sequence, including descriptions of six novel alleles, and four previously unmapped genes. Historically, this complex locus architecture has hindered the characterization of IGH germline single nucleotide, copy number, and structural variants (SNVs; CNVs; SVs), and as a result, there remains little known about the role of IGH polymorphisms in inter-individual…

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Tuesday, April 21, 2020

Chryseobacterium mulctrae sp. nov., isolated from raw cow’s milk.

A Gram-stain-negative bacterial strain, designated CA10T, was isolated from bovine raw milk sampled in Anseong, Republic of Korea. Cells were yellow-pigmented, aerobic, non-motile bacilli and grew optimally at 30?°C and pH 7.0 on tryptic soy agar without supplementation of NaCl. Phylogenetic analysis based on the 16S rRNA gene sequences revealed that strain CA10T belonged to the genus Chryseobacterium, family Flavobacteriaceae, and was most closely related to Chryseobacterium indoltheticum ATCC 27950T (98.75?% similarity). The average nucleotide identity and digital DNA-DNA hybridization values of strain CA10T were 94.4 and 56.9?%, respectively, relative to Chryseobacterium scophthalmum DSM 16779T, being lower than the cut-off…

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Tuesday, April 21, 2020

Allopseudarcicella aquatilis gen. nov., sp. nov., isolated from freshwater.

A Gram-stain-negative, rod-shaped and red-pigmented strain, HME7025T, was isolated from freshwater sampled in the Republic of Korea. Phylogenetic analysis based on its 16S rRNA gene sequence revealed that strain HME7025T formed a lineage within the family Cytophagaceae of the phylum Bacteroidetes. Strain HME7025T was closely related to the genera Pseudarcicella, Arcicella and Flectobacillus. The 16S rRNA gene sequence similarity values of strain HME7025T were under 94.5?% to its closest phylogenetic neighbours. The major fatty acids of strain HME7025T were iso-C15?:?0 (41.9?%), summed feature 3 (comprising C16?:?1?7c and/or C16?:?1?6c; 12.2?%) and anteiso-C15?:?0 (10.8?%). The major respiratory quinone was menaquinone-7. The major…

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Tuesday, April 21, 2020

The complete genome sequence and comparative genome analysis of the multi-drug resistant food-borne pathogen Bacillus cereus.

Bacillus cereus is an opportunistic human pathogen causing food-borne gastrointestinal infections and non-gastrointestinal infections worldwide. The strain B. cereus FORC_013 was isolated from fried eel. Its genome was completely sequenced by PacBio technology, analyzed and compared with other complete genome sequences of Bacillus to elucidate the distinct pathogenic features of the strain isolated in South Korea. Genomic analysis revealed pathogenesis and host immune evasion-associated genes encoding tissue-destructive exoenzymes, and pore-forming toxins. In particular, tissue-destructive (hemolysin BL, nonhaemolytic enterotoxins) and cytolytic proteins (cytolysin) were observed in the genome, which damage the plasma membrane of the epithelial cells of the small intestine…

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Tuesday, April 21, 2020

Single-Cell Virus Sequencing of Influenza Infections That Trigger Innate Immunity.

Influenza virus-infected cells vary widely in their expression of viral genes and only occasionally activate innate immunity. Here, we develop a new method to assess how the genetic variation in viral populations contributes to this heterogeneity. We do this by determining the transcriptome and full-length sequences of all viral genes in single cells infected with a nominally “pure” stock of influenza virus. Most cells are infected by virions with defects, some of which increase the frequency of innate-immune activation. These immunostimulatory defects are diverse and include mutations that perturb the function of the viral polymerase protein PB1, large internal deletions…

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Tuesday, April 21, 2020

Long-read amplicon denoising.

Long-read next-generation amplicon sequencing shows promise for studying complete genes or genomes from complex and diverse populations. Current long-read sequencing technologies have challenging error profiles, hindering data processing and incorporation into downstream analyses. Here we consider the problem of how to reconstruct, free of sequencing error, the true sequence variants and their associated frequencies from PacBio reads. Called ‘amplicon denoising’, this problem has been extensively studied for short-read sequencing technologies, but current solutions do not always successfully generalize to long reads with high indel error rates. We introduce two methods: one that runs nearly instantly and is very accurate for…

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Tuesday, April 21, 2020

Comprehensive transcriptome analysis reveals genes potentially involved in isoflavone biosynthesis in Pueraria thomsonii Benth.

Pueraria thomsonii Benth is an important medicinal plant. Transcriptome sequencing, unigene assembly, the annotation of transcripts and the study of gene expression profiles play vital roles in gene function research. However, the full-length transcriptome of P. thomsonii remains unknown. Here, we obtained 44,339 nonredundant transcripts of P. thomsonii by using the PacBio RS II Isoform and Illumina sequencing platforms, of which 43,195 were annotated genes. Compared with the expression levels in the plant roots, those of transcripts with a |fold change| = 4 and FDR < 0.01 in the leaves or stems were assigned as differentially expressed transcripts (DETs). In…

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Tuesday, April 21, 2020

Consensus and variations in cell line specificity among human metapneumovirus strains.

Human metapneumovirus (HMPV) has been a notable etiological agent of acute respiratory infection in humans, but it was not discovered until 2001, because HMPV replicates only in a limited number of cell lines and the cytopathic effect (CPE) is often mild. To promote the study of HMPV, several groups have generated green fluorescent protein (GFP)-expressing recombinant HMPV strains (HMPVGFP). However, the growing evidence has complicated the understanding of cell line specificity of HMPV, because it seems to vary notably among HMPV strains. In addition, unique A2b clade HMPV strains with a 180-nucleotide duplication in the G gene (HMPV A2b180nt-dup strains)…

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