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Thursday, August 19, 2021

Application Brief: No-Amp targeted sequencing – Best Practices

With the PacBio no-amplification (No-Amp) targeted sequencing method, you can now sequence through previously inaccessible regions of the genome to provide base-level resolution of disease-causing repeat expansions. By combining the CRISPR-Cas9 enrichment method with Single Molecule, Real-Time (SMRT) Sequencing on the Sequel Systems you are no longer limited by hard-to-amplify targets.

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Tuesday, June 1, 2021

SMRT Sequencing solutions for investigative studies to understand evolutionary processes.

Single Molecule, Real-Time (SMRT) Sequencing holds promise for addressing new frontiers to understand molecular mechanisms in evolution and gain insight into adaptive strategies. With read lengths exceeding 10 kb, we are able to sequence high-quality, closed microbial genomes with associated plasmids, and investigate large genome complexities, such as long, highly repetitive, low-complexity regions and multiple tandem-duplication events. Improved genome quality, observed at 99.9999% (QV60) consensus accuracy, and significant reduction of gap regions in reference genomes (up to and beyond 50%) allow researchers to better understand coding sequences with high confidence, investigate potential regulatory mechanisms in noncoding regions, and make inferences…

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Tuesday, June 1, 2021

Assembly of complete KIR haplotypes from a diploid individual by the direct sequencing of full-length fosmids.

We show that linearizing and directly sequencing full-length fosmids simplifies the assembly problem such that it is possible to unambiguously assemble individual haplotypes for the highly repetitive 100-200 kb killer Ig-like receptor (KIR) gene loci of chromosome 19. A tiling of targeted fosmids can be used to clone extended lengths of genomic DNA, 100s of kb in length, but repeat complexity in regions of particular interest, such as the KIR locus, means that sequence assembly of pooled samples into complete haplotypes is difficult and in many cases impossible. The current maximum read length generated by SMRT Sequencing exceeds the length…

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Tuesday, June 1, 2021

Introduction to SMRT informatics developers conference

2015 SMRT Informatics Developers Conference Presentation Slides: Kevin Corcoran of PacBio provided a brief review of community involvement in the development of analysis tools and showed a preview of upcoming sample preparation, chemistry and informatics improvements.

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Tuesday, June 1, 2021

Immune regions are no longer incomprehensible with SMRT Sequencing

The complex immune regions of the genome, including MHC and KIR, contain large copy number variants (CNVs), a high density of genes, hyper-polymorphic gene alleles, and conserved extended haplotypes (CEH) with enormous linkage disequilibrium (LDs). This level of complexity and inherent biases of short-read sequencing make it challenging for extracting immune region haplotype information from reference-reliant, shotgun sequencing and GWAS methods. As NGS based genome and exome sequencing and SNP arrays have become a routine for population studies, numerous efforts are being made for developing software to extract and or impute the immune gene information from these datasets. Despite these…

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Tuesday, June 1, 2021

Multiplex target enrichment using barcoded multi-kilobase fragments and probe-based capture technologies

Target enrichment capture methods allow scientists to rapidly interrogate important genomic regions of interest for variant discovery, including SNPs, gene isoforms, and structural variation. Custom targeted sequencing panels are important for characterizing heterogeneous, complex diseases and uncovering the genetic basis of inherited traits with more uniform coverage when compared to PCR-based strategies. With the increasing availability of high-quality reference genomes, customized gene panels are readily designed with high specificity to capture genomic regions of interest, thus enabling scientists to expand their research scope from a single individual to larger cohort studies or population-wide investigations. Coupled with PacBio® long-read sequencing, these…

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Tuesday, June 1, 2021

“SMRTer Confirmation”: Scalable clinical read-through variant confirmation using the Pacific Biosciences SMRT Sequencing platform

Next-generation sequencing (NGS) has significantly improved the cost and turnaround time for diagnostic genetic tests. ACMG recommends variant confirmation by an orthogonal method, unless sufficiently high sensitivity and specificity can be demonstrated using NGS alone. Most NGS laboratories make extensive use of Sanger sequencing for secondary confirmation of single nucleotide variants (SNVs) and indels, representing a large fraction of the cost and time required to deliver high quality genetic testing data to clinicians and patients. Despite its established data quality, Sanger is not a high-throughput method by today’s standards from either an assay or analysis standpoint as it can involve…

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Tuesday, June 1, 2021

Characterizing the pan-genome of maize with PacBio SMRT Sequencing

Maize is an amazingly diverse crop. A study in 20051 demonstrated that half of the genome sequence and one-third of the gene content between two inbred lines of maize were not shared. This diversity, which is more than two orders of magnitude larger than the diversity found between humans and chimpanzees, highlights the inability of a single reference genome to represent the full pan-genome of maize and all its variants. Here we present and review several efforts to characterize the complete diversity within maize using the highly accurate long reads of PacBio Single Molecule, Real-Time (SMRT) Sequencing. These methods provide…

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Tuesday, June 1, 2021

A workflow for the comprehensive detection and prioritization of variants in human genomes with PacBio HiFi reads

PacBio HiFi reads (minimum 99% accuracy, 15-25 kb read length) have emerged as a powerful data type for comprehensive variant detection in human genomes. The HiFi read length extends confident mapping and variant calling to repetitive regions of the genome that are not accessible with short reads. Read length also improves detection of structural variants (SVs), with recall exceeding that of short reads by over 30%. High read quality allows for accurate single nucleotide variant and small indel detection, with precision and recall matching that of short reads. While many tools have been developed to take advantage of these qualities…

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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

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: Understanding, curating, and analyzing your diploid genome assembly

The goal of this session is to help users complete their PacBio genome assembly and generate the best resource for their research. Kingan begins with a brief review of the diploid assembly process used by FALCON and FALCON-Unzip, highlighting the enhanced phasing of the Unzip module, and concluding with recommendations for genome polishing. Next, she explores how heterozygosity can influence the assembly process and how read coverage depth along the assembly can reveal important characteristics of assembly structure. Kingan then recommends approaches, including specific tools, that can be used to quality filter and curate the assembly, including annotation-, coverage-, and…

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