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Thursday, August 19, 2021

Whitepaper: Structural variation in the human genome

Structural variation accounts for much of the variation among human genomes. Structural variants of all types are known to cause Mendelian disease and contribute to complex disease. Learn how long-read sequencing is enabling detection of the full spectrum of structural variants to advance the study of human disease, evolution and genetic diversity.

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Tuesday, June 1, 2021

Structural variant detection with low-coverage Pacbio sequencing

Despite amazing progress over the past quarter century in the technology to detect genetic variants, intermediate-sized structural variants (50 bp to 50 kb) have remained difficult to identify. Such variants are too small to detect with array comparative genomic hybridization, but too large to reliably discover with short-read DNA sequencing. Recent de novo assemblies of human genomes have demonstrated the power of PacBio Single Molecule, Real-Time (SMRT) Sequencing to fill this technology gap and sensitively identify structural variants in the human genome. While de novo assembly is the ideal method to identify variants in a genome, it requires high depth…

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Tuesday, June 1, 2021

Detecting pathogenic structural variants with low-coverage PacBio sequencing.

Though a role for structural variants in human disease has long been recognized, it has remained difficult to identify intermediate-sized variants (50 bp to 5 kb), which are too small to detect with array comparative genomic hybridization, but too large to reliably discover with short-read DNA sequencing. Recent studies have demonstrated that PacBio Single Molecule, Real-Time (SMRT) sequencing fills this technology gap. SMRT sequencing detects tens of thousands of structural variants in the human genome, approximately five times the sensitivity of short-read DNA sequencing.

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Tuesday, June 1, 2021

Detecting pathogenic structural variants with long-read PacBio SMRT Sequencing

Most of the base pairs that differ between two human genomes are in intermediate-sized structural variants (50 bp to 5 kb), which are too small to detect with array comparative genomic hybridization or optical mapping but too large to reliably discover with short-read DNA sequencing. Long-read sequencing with PacBio Single Molecule, Real-Time (SMRT) Sequencing platforms fills this technology gap. PacBio SMRT Sequencing detects tens of thousands of structural variants in a human genome with approximately five times the sensitivity of short-read DNA sequencing. Effective application of PacBio SMRT Sequencing to detect structural variants requires quality bioinformatics tools that account for…

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Tuesday, June 1, 2021

Joint calling and PacBio SMRT Sequencing for indel and structural variant detection in populations

Fast and effective variant calling algorithms have been crucial to the successful application of DNA sequencing in human genetics. In particular, joint calling – in which reads from multiple individuals are pooled to increase power for shared variants – is an important tool for population surveys of variation. Joint calling was applied by the 1000 Genomes Project to identify variants across many individuals each sequenced to low coverage (about 5-fold). This approach successfully found common small variants, but broadly missed structural variants and large indels for which short-read sequencing has limited sensitivity. To support use of large variants in rare…

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Tuesday, June 1, 2021

Comprehensive variant detection in a human genome with highly accurate long reads

Introduction: Long-read sequencing has revealed more than 20,000 structural variants spanning over 12 Mb in a healthy human genome. Short-read sequencing fails to detect most structural variants but has remained the more effective approach for small variants, due to 10-15% error rates in long reads, and copy-number variants (CNVs), due to lack of effective long-read variant callers. The development of PacBio highly accurate long reads (HiFi reads) with read lengths of 10-25 kb and quality >99% presents the opportunity to capture all classes of variation with one approach.Methods: We sequence the Genome in a Bottle benchmark sample HG002 and an…

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Friday, February 5, 2021

Podcast: We’re over halfway there: Baylor’s Richard Gibbs on clinical genetics

In this podcast, Gibbs shares his perspective on the complementary roles genomics and genetics plays in driving our understanding of human biology. Richard says that the Human genome project was actually a departure from had been typical in the field of human genetics. He notes, “there really was this departure between human genetics and genomics for a decade and a half or more, really because of the demands of doing the genome project there was too much to do to stop and think about some of these more fundamental problems in genetics.” Gibbs observes that we have now entered a…

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Friday, February 5, 2021

Podcast: Exploring the exome and the future of genomics with Jay Shendure

Jay Shendure, a Professor in the Department of Genome Sciences at the University of Washington School of Medicine explores the role of exome sequencing in clinical genomics. In this Podcast he discusses his views on the current and future roles of sequencing in diagnosing Mendelian disorders and investigation of complex regions of the genome.

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Friday, February 5, 2021

Webinar: Sequencing structural variants for disease gene discovery and population genetics

Structural variants (SVs, differences >50 base pairs) account for most of the base pairs that differ between two human genomes, and are known to cause over 1,000 genetic disorders including ALS, schizophrenia, and hereditary cancer. Yet, SVs remain overlooked in human genetic research studies due to the limited power of short-read sequencing methods (exome and whole genome sequencing) to resolve large variants, which often involve repetitive DNA. Recent advances in long-read sequencing have made it possible to detect the over 20,000 SVs that are now known to exist in a human genome. Corresponding advances in long-read SV calling algorithms have…

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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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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

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

Webinar: Increasing solve rates for rare and Mendelian diseases with long-read sequencing

Dr. Wenger gives attendees an update on PacBio’s long-read sequencing and variant detection capabilities on the Sequel II System and shares recommendations on how to design your own study using HiFi reads. Then, Dr. Sund from Cincinnati Children’s Hospital Medical Center describes how she has used long-read sequencing to solve rare neurological diseases involving complex structural rearrangements that were previously unsolved with standard methods.

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Friday, February 5, 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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