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Tuesday, June 1, 2021

A high-quality de novo genome assembly from a single mosquito using PacBio sequencing

A high-quality reference genome is an essential tool for studies of plant and animal genomics. PacBio Single Molecule, Real-Time (SMRT) Sequencing generates long reads with uniform coverage and high consensus accuracy, making it a powerful technology for de novo genome assembly. While PacBio is the core technology for many large genome initiatives, relatively high DNA input requirements (3 µg for standard library protocol) have placed PacBio out of reach for many projects on small, non-inbred organisms that may have lower DNA content. Here we present high-quality de novo genome assemblies from single invertebrate individuals for two different species: the Anopheles…

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Tuesday, June 1, 2021

A low DNA input protocol for high-quality PacBio de novo genome assemblies

A high-quality reference genome is an essential tool for studying the genetics of traits and disease, organismal, comparative and conservation biology, and population genomics. PacBio Single Molecule, Real-Time (SMRT) Sequencing generates long reads with uniform coverage and high consensus accuracy, making it a powerful technology for de novo genome assembly. Improvements in throughput and concomitant reductions in cost have made PacBio an attractive core technology for many large genome initiatives. However, relatively high DNA input requirements (3 µg for standard library protocol) have placed PacBio out of reach for many projects on small organisms that may have lower DNA content…

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Tuesday, June 1, 2021

Sequencing the previously unsequenceable using amplification-free targeted enrichment powered by CRISPR/Cas9

Genomic regions with extreme base composition bias and repetitive sequences have long proven challenging for targeted enrichment methods, as they rely upon some form of amplification. Similarly, most DNA sequencing technologies struggle to faithfully sequence regions of low complexity. This has especially been true for repeat expansion disorders such as Fragile X syndrome, Huntington’s disease and various Ataxias, where the repetitive elements range from several hundreds of bases to tens of kilobases. We have developed a robust, amplification-free targeted enrichment technique, called No-Amp Targeted Sequencing, that employs the CRISPR/Cas9 system. In conjunction with Single Molecule, Real-Time (SMRT) Sequencing, which delivers…

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Tuesday, June 1, 2021

Amplification-free targeted enrichment powered by CRISPR-Cas9 and long-read Single Molecule Real-Time (SMRT) Sequencing can efficiently and accurately sequence challenging repeat expansion disorders

Genomic regions with extreme base composition bias and repetitive sequences have long proven challenging for targeted enrichment methods, as they rely upon some form of amplification. Similarly, most DNA sequencing technologies struggle to faithfully sequence regions of low complexity. This has been especially trying for repeat expansion disorders such as Fragile-X disease, Huntington disease and various Ataxias, where the repetitive elements range from several hundreds of bases to tens of kilobases. We have developed a robust, amplification-free targeted enrichment technique, called No-Amp Targeted Sequencing, that employs the CRISPR-Cas9 system. In conjunction with SMRT Sequencing, which delivers long reads spanning the…

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Friday, February 5, 2021

Video: The Sequel System – The premier solution for SMRT Sequencing

The Sequel System, powered by Single Molecule, Real-Time (SMRT) Technology, delivers long reads, high consensus accuracy, uniform coverage and epigenetic characterization. This newly introduced platform provides higher throughput, a reduced footprint and lower sequencing project costs compared to the PacBio RS, the original long-read sequencer.

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Friday, February 5, 2021

ASHG Virtual Poster: De novo assembly of a diploid Asian genome

Yunfei Guo, from the University of Southern California, presents his ASHG 2015 poster on a de novo assembly of a diploid Asian genome. The uniform coverage of long-read sequencing helped access regions previously unresolvable due to high GC bias or long repeats. The assembly allowed scientists to fill some 400 gaps in the latest human reference genome, including some as long as 50 kb.

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Friday, February 5, 2021

ASHG Virtual Poster: Enrichment of unamplified DNA and long-read SMRT Sequencing to unlock repeat expansion disorders

PacBio’s Jenny Ekholm presents this ASHG 2016 poster on a new method being developed that enriches for unamplified DNA and uses SMRT Sequencing to characterize repeat expansion disorders. Incorporating the CRISPR/Cas9 system to target specific genes allows for amplification-free enrichment to preserve epigenetic information and avoid PCR bias. Internal studies have shown that the approach can successfully be used to target and sequence the CAG repeat responsible for Huntington’s disease, the repeat associated with ALS, and more. The approach allows for pooling many samples and sequencing with a single SMRT Cell.

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Friday, February 5, 2021

AGBT Virtual Poster: Targeted SMRT Sequencing of difficult regions of the genome using a Cas9, non-amplification based method

Targeted sequencing has proven to be an economical means of obtaining sequence information for one or more defined regions of a larger genome. However, most target enrichment methods are reliant upon some form of amplification. Amplification removes the epigenetic marks present in native DNA, and some genomic regions, such as those with extreme GC content and repetitive sequences, are recalcitrant to faithful amplification. Yet, a large number of genetic disorders are caused by expansions of repeat sequences. Furthermore, for some disorders, methylation status has been shown to be a key factor in the mechanism of disease. We have developed a…

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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

Webinar: An introduction to PacBio’s long-read sequencing & how it has been used to make important scientific discoveries

In this Webinar, we will give an introduction to Pacific Biosciences’ single molecule, real-time (SMRT) sequencing. After showing how the system works, we will discuss the main features of the technology with an emphasis on the difference between systematic error and random error and how SMRT sequencing produces better consensus accuracy than other systems. Following this, we will discuss several ground-breaking discoveries in medical science that were made possible by the longs reads and high accuracy of SMRT Sequencing.

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Friday, February 5, 2021

Webinar: Assembling high-quality human reference genomes for global populations

This webinar highlights global initiatives currently underway to use Single Molecule, Real-Time (SMRT) Sequencing to de novo assemble genomes of individuals representing multiple ethnic populations, thereby extending the diversity of available human reference genomes. In their presentations, Tina Graves-Lindsay from Washington University and Adam Ameur from Uppsala University spoke about diploid assemblies, discovering novel sequence and improving diversity of the current human reference genome. Finally, Paul Peluso of PacBio presented data from the recent effort to sequence a Puerto Rican genome and shared a SMRT Sequencing technology roadmap showing the next several upgrades for the Sequel System.

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Friday, February 5, 2021

Webinar: Sequence with Confidence – Introducing the Sequel II System

In this webinar, Jonas Korlach, Chief Scientific Officer, PacBio provides an overview of the features and the advantages of the new Sequel II System. Kiran Garimella, Senior Computational Scientist, Broad Institute of MIT and Harvard University, describes his work sequencing humans with HiFi reads enabling discovery of structural variants undetectable in short reads. Luke Tallon, Scientific Director, Genomics Resource Center, Institute for Genome Sciences, University of Maryland School of Medicine, covers the GRC’s work on bacterial multiplexing, 16S microbiome profiling, and shotgun metagenomics. Finally, Shane McCarthy, Senior Research Associate, University of Cambridge, focuses on the scaling and affordability of high-quality…

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Friday, February 5, 2021

Webinar: Beyond Gene Editing: How CRISPR/Cas9 enables sequencing of difficult regions of the genome

In this webinar, Jenny Ekholm and Paul Kotturi provide an overview of the PacBio No-Amp targeted sequencing application and its uses for targeting hard-to-amplify genes. This approach couples CRISPR-Cas9 with Single Molecule, Real Time (SMRT) Sequencing to enrich targets, without the need for PCR amplification, and generate complete sequence information with base-level resolution.

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Friday, February 5, 2021

Webinar: Amplicon sequencing with confidence – High-fidelity, long-read PacBio sequencing solutions

In this webinar, Lori Aro and Cheryl Heiner of PacBio describe how high-throughput amplicon sequencing using Single Molecule, Real-Time (SMRT) Sequencing and the Sequel System allows for the easy and cost-effective generation of high-fidelity, long reads from amplicons ranging in size from several hundred base pairs to 20 kb. Topics covered include the latest advances in SMRT Sequencing performance for detection of all variant types even in difficult to sequence regions of the genome, multiplexing options to increase throughput and improve efficiency, and examples of amplicon sequencing of clinically relevant targets.

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Friday, February 5, 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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