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Tuesday, June 1, 2021

Unbiased characterization of metagenome composition and function using HiFi sequencing on the PacBio Sequel II System

Recent work comparing metagenomic sequencing methods indicates that a comprehensive picture of the taxonomic and functional diversity of complex communities will be difficult to achieve with short-read technology alone. While the lower cost of short reads has enabled greater sequencing depth, the greater contiguity of long-read assemblies and lack of GC bias in SMRT Sequencing has enabled better gene finding. However, since long-read assembly requires high coverage for error correction, the benefits of unbiased coverage have in the past been lost for low abundance species. SMRT Sequencing performance improvements and the introduction of the Sequel II System has enabled a…

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Tuesday, June 1, 2021

A complete solution for full-length transcript sequencing using the PacBio Sequel II System

Long read mRNA sequencing methods such as PacBio’s Iso-Seq method offers high-throughput transcriptome profiling in prokaryotic and eukaryotic cells. By avoiding the transcript assembly problem and instead sequencing full-length cDNA, Iso-Seq has emerged as the most reliable technology for annotating isoforms and, in turn, improving proteome predictions in a wide variety of organisms. Improvements in library preparation, sequencing throughput, and bioinformatics has enabled the Iso-Seq method to be complete solution for transcript characterization. The Iso-Seq Express kit is a one-day library prep requiring 60-300 ng of total RNA. The PacBio Sequel II system produces 4-5 million full-length reads, sufficient to…

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Tuesday, June 1, 2021

New advances in SMRT Sequencing facilitate multiplexing for de novo and structural variant studies

The latest advancements in Sequel II SMRT Sequencing have increased average read lengths up to 50% compared to Sequel II chemistry 1.0 which allows multiplexing of 2-3 small organisms (98% of conserved genes) for both individuals. For microbial multiplexing, we multiplexed 48 microbes with varying complexities and sizes ranging 1.6-8.0 Mb in single SMRT Cell 8M. Using a new end-to-end analysis (Microbial Assembly Analysis, SMRT Link 8.0), assemblies resulted in complete circularized genomes (>200-fold coverage) and efficient detection of >3-200 kb plasmids. Finally, the long read lengths (>90 kb) allows detection of barcodes in large insert SMRTbell templates (>15 kb)…

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Tuesday, June 1, 2021

Unbiased characterization of metagenome composition and function using HiFi sequencing on the PacBio Sequel II System

Recent work comparing metagenomic sequencing methods indicates that a comprehensive picture of the taxonomic and functional diversity of complex communities will be difficult to achieve with one sequencing technology alone. While the lower cost of short reads has enabled greater sequencing depth, the greater contiguity of long-read assemblies and lack of GC bias in SMRT Sequencing has enabled better gene finding. However, since long-read assembly typically requires high coverage for error correction, these benefits have in the past been lost for low-abundance species. The introduction of the Sequel II System has enabled a new, higher throughput, assembly-optional data type that…

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Tuesday, June 1, 2021

Low-input single molecule HiFi sequencing for metagenomic samples

HiFi sequencing on the PacBio Sequel II System enables complete microbial community profiling of complex metagenomic samples using whole genome shotgun sequences. With HiFi sequencing, highly accurate long reads overcome the challenges posed by the presence of intergenic and extragenic repeat elements in microbial genomes, thus greatly improving phylogenetic profiling and sequence assembly. Recent improvements in library construction protocols enable HiFi sequencing starting from as low as 5 ng of input DNA. Here, we demonstrate comparative analyses of a control sample of known composition and a human fecal sample from varying amounts of input genomic DNA (1 ug, 200 ng,…

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Tuesday, June 1, 2021

Metagenomic analysis of type II diabetes gut microbiota using PacBio HiFi reads reveals taxonomic and functional differences

In the past decade, the human microbiome has been increasingly shown to play a major role in health. For example, imbalances in gut microbiota appear to be associated with Type II diabetes mellitus (T2DM) and cardiovascular disease. Coronary artery disease (CAD) is a major determinant of the long-term prognosis among T2DM patients, with a 2- to 4-fold increased mortality risk when present. However, the exact microbial strains or functions implicated in disease need further investigation. From a large study with 523 participants (185 healthy controls, 186 T2DM patients without CAD, and 106 T2DM patients with CAD), 3 samples from each…

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Friday, February 5, 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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Friday, February 5, 2021

i5K Webinar: High-quality de novo insect genome assemblies using PacBio sequencing

PacBio Sequencing is characterized by very long sequence reads (averaging > 10,000 bases), lack of GC-bias, and high consensus accuracy. These features have allowed the method to provide a new gold standard in de novo genome assemblies, producing highly contiguous (contig N50 > 1 Mb) and accurate (> QV 50) genome assemblies. We will briefly describe the technology and then highlight the full workflow, from sample preparation through sequencing to data analysis, on examples of insect genome assemblies, and illustrate the difference these high-quality genomes represent with regard to biological insights, compared to fragmented draft assemblies generated by short-read sequencing.

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Friday, February 5, 2021

Tutorial: Circular Consensus Sequence analysis application [SMRT Link v5.0.0]

This tutorial provides an overview of the Circular Consensus Sequence (CCS) analysis application. The CCS algorithm is used in applications that require distinguishing closely related DNA molecules in the same sample. Applications of CCS include profiling microbial communities, resolving viral populations and accurately identifying somatic variations within heterogeneous tumor cells. This tutorial covers features of SMRT Link v5.0.0.

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Friday, February 5, 2021

AGBT PacBio Workshop: SMRT Sequencing roadmap: better throughput, lower costs

In this AGBT 2017 talk, PacBio CSO Jonas Korlach provided a technology roadmap for the Sequel System, including plans the continue performance and throughput increases through early 2019. Per SMRT Cell throughput of the Sequel System is expected to double this year and again next year. Together with a new higher-capacity SMRT Cell expected to be released by the end of 2018, these improvements result in a ~30-fold increase or ~150 Gb / SMRT Cell allowing a real $1000 real de novo human genome assembly. Also discussed: Additional application protocol improvements, new chemistry and software updates, and a look at…

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Friday, February 5, 2021

Webinar: Addressing “NGS Dead Zones” with third generation PacBio sequencing

SMRT Sequencing is a DNA sequencing technology characterized by long read lengths and high consensus accuracy, regardless of the sequence complexity or GC content of the DNA sample. These characteristics can be harnessed to address medically relevant genes, mRNA transcripts, and other genomic features that are otherwise difficult or impossible to resolve. I will describe examples for such new clinical research in diverse areas, including full-length gene sequencing with allelic haplotype phasing, gene/pseudogene discrimination, sequencing extreme DNA contexts, high-resolution pharmacogenomics, biomarker discovery, structural variant resolution, full-length mRNA isoform cataloging, and direct methylation detection.

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Friday, February 5, 2021

Webinar: SMRT Sequencing applications in plant and animal sciences: an overview

In this webinar, Emily Hatas of PacBio shares information about the applications and benefits of SMRT Sequencing in plant and animal biology, agriculture, and industrial research fields. This session contains an overview of several applications: whole-genome sequencing for de novo assembly; transcript isoform sequencing (Iso-Seq) method for genome annotation; targeted sequencing solutions; and metagenomics and microbial interactions. High-level workflows and best practices are discussed for key applications.

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Friday, February 5, 2021

User Group Meeting: Development, validation, and applications of a high-fidelity, species-specific, eubacterial pan-domain microbiome assay on the PacBio System

In this PacBio User Group Meeting presentation, Garth Ehrlich of Drexel University College of Medicine shares his work on developing a microbiome assay that uses SMRT Sequencing to provide high-quality coverage of the 16S bacterial rRNA for species identification. The microbiome analysis pipeline, MCSMRT, takes advantage of PacBio circular consensus sequencing (CCS) technology and second-generation pathway analysis system for generating extremely high-fidelity sequences that provide the user with ultra-high-confidence species-level microbiome data.

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