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Friday, February 5, 2021

ASHG PacBio Workshop: PacBio product updates and roadmap – announcing the release of new chemistry and software

In this ASHG workshop presentation , Jonas Korlach, CSO of PacBio, walked attendees through recent product updates and the coming technology roadmap. The Sequel System 6.0 release offered major improvements to accuracy, throughput, structural variant calling, and large-insert libraries, he said, showing examples of 35 kb libraries. Looking ahead, Korlach said that the V2 express library preparation product should be available early in 2019, with the new 8M SMRT Cell being introduced sometime later.

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Friday, February 5, 2021

ASHG PacBio Workshop: The Iso-Seq method for discovering alternative splicing in human diseases

In this ASHG workshop presentation, Elizabeth Tseng of PacBio showed how the Iso-Seq method can be used to discover disease-associated alternative splicing. Because this approach to isoform sequencing yields accurate, full-length transcripts requiring no assembly, it’s ideal for disease studies that need a more comprehensive picture of alternative splicing activity. Tseng offered several published examples of how the Iso-Seq method has been used for everything from single-gene studies to whole-transcriptome studies, and also detailed how the latest Sequel System chemistry recovers more genes and produces more usable reads.

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Friday, February 5, 2021

ASHG PacBio Workshop: Long-read sequencing for disease genome analysis: Our experiences

In this presentation, Naomichi Matsumoto from Yokohama City University speaks about the use of SMRT Sequencing to solve Mendelian diseases, including the story of how his lab discovered a 12.4 kb structural variant that’s responsible for progressive myoclonic epilepsy in two siblings. He also reports progress in understanding repeat expansion disorders by pairing SMRT Sequencing with new analysis tools designed to highlight repetitive areas.

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Friday, February 5, 2021

ASHG PacBio Workshop: Long-read sequencing in oncology and population research: Perspectives and opportunities

In this presentation, Shawn Levy from the HudsonAlpha Institute for Biotechnology and HudsonAlpha Discovery offers a look at his team’s early access experience with the Sequel II System. Recent work includes a project designed to improve sequencing results from FFPE samples with long-read data. The protocol is still being optimized, but preliminary results indicate that SMRT Sequencing improves the quality of data that can be produced from these highly degraded samples. Looking ahead, Levy’s team will be using SMRT Sequencing to generate about 7,000 long-read genome assemblies for the All of Us program.

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Friday, February 5, 2021

Video Poster: Accurate, comprehensive variant calling in difficult-to-map genes using HiFi reads

Introduction: Around 5% (1,168) of protein-coding genes in the human genome contain an exon that is difficult to map with typical next-generation sequencing (NGS) read lengths due to homologous pseudogenes or segmental duplications. Among the difficult-to-map genes are 193 with known medical relevance, including CYP2D6, GBA, SMN1/2, and VWF. Long-read DNA sequencing provides increased mappability, accessing many of the difficult-to-map regions by connecting the homologous exon to neighboring unique sequence. Until recently, the read-level accuracy of long-read sequencing had made it challenging to accurately call small variants. The recently developed HiFi reads from the PacBio Sequel II System provide both…

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Friday, February 5, 2021

Video Poster: Long-read sequencing of the SARS-CoV-2 genome and the human immune repertoire

COVID-19 is caused by the infection of SARS-CoV-2, a member of the coronavirus family. Complete and accurate sequencing of the SARS-CoV-2 genome enables discovery and epidemiological tracing of mutations that may be important for antiviral and vaccine research. A complementary approach, sequencing the patients’ immune repertoire, allows for detection of neutralizing antibodies and understanding variation in the adaptive immune response. PacBio’s SMRT Sequencing uses circular consensus sequencing that can generate long, highly accurate (HiFi) reads. We find that a tiled multiplex PCR amplicon approach of ~1-2 kb fragments achieves a balanced tradeoff between ease of library preparation and robustness to…

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Friday, February 5, 2021

Video Poster: High-throughput HiFi library workflow for human whole genome sequencing on the Sequel II System

Recent advances in sequencing chemistry and software in the Sequel II System enable generating highly accurate long reads that are up to 25 kb in length with >99% accuracy. The high quality HiFi reads are suitable for variant detection of all types, from single nucleotides to structural variants. PacBio offers an end-to-end solution from sample preparation to data analysis. However, library construction is still a bottleneck making it difficult to implement into a high-throughput workflow for sequencing large number of samples. Input DNA requirements, DNA shearing and size-selection/fractionation are the most critical and challenging steps in the current procedure. In…

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Friday, February 5, 2021

Virtual Global Summit: DeepVariant – Accurate variant calling with PacBio HiFi data

In this PacBio Virtual Global Summit 2020 presentation, Pi-Chuan Chang of Google shares how DeepVariant identifies SNPs and Indels in PacBio HiFi data, starting from the v0.8 release (April 2019). In her talk, Chang details recent accuracy improvements that won the PrecisionFDA Truth Challenge v2, which are now available in the latest release (v1.0 in September 2020).

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Friday, February 5, 2021

Video Poster: Capture long-read isoform sequencing (Iso-Seq) for uncovering human isoform diversity in the brain and characterizing SARS-CoV2 viral RNAs

Most genes in eukaryotic organisms produce alternative isoforms, broadening the diversity of proteins and non-coding RNAs encoded by the genome. In contrast to other RNA sequencing platforms that rely on short-read sequencing, long accurate reads from PacBio Single Molecule, Real-Time (SMRT) Sequencing can characterize full-length transcripts without the need for assembly and inference. The PacBio isoform sequencing (Iso-Seq) method generates full-length sequences for transcripts up to 10 kb in length, with scalable throughput using barcoding approaches. The Iso-Seq application can be employed for a wide variety of studies, including improvement of gene annotation, identification of novel isoforms and fusion transcripts,…

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Friday, February 5, 2021

Video Poster: A new approach to Thalassemia and Ataxia carrier screening panels using CRISPR-Cas9 enrichment and long-read sequencing

Although PCR is a cost-effective way to enrich for genomic regions of interest for DNA sequencing, amplifying regions with extreme GC-content and long stretches of short tandem repeat (STR) sequences is often problematic and prone to sequence artifacts. This is especially true when developing multiplexed PCR assays for clinical applications such as carrier screening for multiple genes. The additional challenge is that all PCR primer pairs must be carefully selected to be compatible based on amplicon size and PCR conditions. Due to these experimental design constraints, a single tube with a high number of multiplexed PCR amplicons is difficult to…

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PacBio Grants Equity Incentive Award to New Employee

Friday, November 19, 2021

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