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Friday, February 5, 2021

Webinar: Detecting structural variants in PacBio reads – tools and applications

Most of the basepairs 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 CGH but too large to reliably discover with short-read NGS. PacBio Single Molecule, Real-Time (SMRT) Sequencing fills this technology gap. SMRT Sequencing detects tens of thousands of structural variants in a human genome, approximately five times the sensitivity of short-read NGS. To discover variants using SMRT Sequencing, we have developed pbsv, which is available in version 5 of the PacBio SMRT Link software suite. The pbsv algorithm applies a sequence of stages:…

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Friday, February 5, 2021

ASHG PacBio Workshop: PacBio applications updates & future roadmap

In this ASHG 2017 presentation, Jonas Korlach, the CSO of PacBio shared updates on three applications featuring SMRT Sequencing on the Sequel System, highlighting structural variant detection, targeted sequencing and the Iso-Seq method of RNA sequencing. He provided details on structural variant calling using pbsv to call insertions and deletions and compared PacBio variant calling with other technologies. Korlach described how targeted sequencing can be used to interrogate repeat expansions, detect and phase minor variants and can access medically relevant but previously inaccessible gene targets. He presented research featuring the Iso-Seq method that identified isoforms, corrected previous isoform annotations and…

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Friday, February 5, 2021

Podcast: Huh? 30 million Americans have a rare disease? Howard Jacob on the state of clinical sequencing

Howard Jacob, Chief Genomics Officer at the HudsonAlpha Institute for Biotechnology, explored the role of genomics in diagnosing rare diseases. In this podcast he shared his views on the economics of clinical sequencing and how long-read sequencing is advancing the ability to sequence an individual’s genome –de novo– and use structural variant calling to make clinical diagnoses. He concluded with the hurdles limiting adoption of clinical sequencing and his vision for the future of genomic medicine.

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Friday, February 5, 2021

Tutorial: Minor variant analysis [SMRT Link v5.0.0]

This tutorial provides an overview of the Minor Variants Analysis application in SMRT Link and a live demo of how to launch an analysis in SMRT Link and interpret the results. This application identifies and phases minor single nucleotide variants in complex populations.

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Friday, February 5, 2021

Webinar: Structural variant detection in SMRT Link 5 with PBSV

In this video Aaron Wenger describes the new structural variant detection application, known as pbsv, available in SMRT Link v5.0. This application identifies large (default: =50 bp) insertions and deletions in a sample relative to a reference from whole genome sequence data. Aaron details pbsv commands and use of the application in SMRT Link.

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Friday, February 5, 2021

Podcast: Why the diversity of genomic data matters

The lack of diversity in genomic data has been an issue of growing concern. It threatens to limit the benefits from the massive investment that has been made to date to transform biomedical research, drug development, and the clinical care of patients. We spoke to Jonas Korlach, chief scientific officer of Pacific Biosciences, about the problem, how it’s being addressed, and the role advancing technology can play in gleaning greater insights from the genomes that are analyzed.

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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

Video: Structural variant detection with SMRT Sequencing

In this video, Aaron Wenger, a research scientist at PacBio, describes the use of long-read SMRT Sequencing to detect structural variants in the human genome. He shares that structural variations – such as insertions and deletions – impact human traits, cause disease, and differentiate humans from other species. Wenger highlights the use of SMRT Sequencing and structural variant calling software tools in a collaboration with Stanford University which identified a disease-causing genetic mutation.

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Tuesday, April 21, 2020

Improved assembly and variant detection of a haploid human genome using single-molecule, high-fidelity long reads.

The sequence and assembly of human genomes using long-read sequencing technologies has revolutionized our understanding of structural variation and genome organization. We compared the accuracy, continuity, and gene annotation of genome assemblies generated from either high-fidelity (HiFi) or continuous long-read (CLR) datasets from the same complete hydatidiform mole human genome. We find that the HiFi sequence data assemble an additional 10% of duplicated regions and more accurately represent the structure of tandem repeats, as validated with orthogonal analyses. As a result, an additional 5 Mbp of pericentromeric sequences are recovered in the HiFi assembly, resulting in a 2.5-fold increase in…

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Tuesday, April 21, 2020

A robust benchmark for germline structural variant detection

New technologies and analysis methods are enabling genomic structural variants (SVs) to be detected with ever-increasing accuracy, resolution, and comprehensiveness. Translating these methods to routine research and clinical practice requires robust benchmark sets. We developed the first benchmark set for identification of both false negative and false positive germline SVs, which complements recent efforts emphasizing increasingly comprehensive characterization of SVs. To create this benchmark for a broadly consented son in a Personal Genome Project trio with broadly available cells and DNA, the Genome in a Bottle (GIAB) Consortium integrated 19 sequence-resolved variant calling methods, both alignment- and de novo assembly-based,…

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Tuesday, April 21, 2020

Telomere-to-telomere assembly of a complete human X chromosome

After nearly two decades of improvements, the current human reference genome (GRCh38) is the most accurate and complete vertebrate genome ever produced. However, no one chromosome has been finished end to end, and hundreds of unresolved gaps persist. The remaining gaps include ribosomal rDNA arrays, large near-identical segmental duplications, and satellite DNA arrays. These regions harbor largely unexplored variation of unknown consequence, and their absence from the current reference genome can lead to experimental artifacts and hide true variants when re-sequencing additional human genomes. Here we present a de novo human genome assembly that surpasses the continuity of GRCh38, along…

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Tuesday, April 21, 2020

Paragraph: A graph-based structural variant genotyper for short-read sequence data

Accurate detection and genotyping of structural variations (SVs) from short-read data is a long-standing area of development in genomics research and clinical sequencing pipelines. We introduce Paragraph, a fast and accurate genotyper that models SVs using sequence graphs and SV annotations produced by a range of methods and technologies. We demonstrate the accuracy of Paragraph on whole genome sequence data from a control sample with both short and long read sequencing data available, and then apply it at scale to a cohort of 100 samples of diverse ancestry sequenced with short-reads. Comparative analyses indicate that Paragraph has better accuracy than…

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