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Thursday, January 7, 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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Wednesday, January 6, 2021

Podcast: Major sequencing projects should be done with long reads

Dan Geraghty explains that while there have been decades’ worth of studies associating the genetics of the major histocompatibility complex (MHC), and the highly polymorphic HLA class 1 and 2 genes, we still haven’t found the key mutations for a variety of different autoimmune diseases such as type 1 diabetes, rheumatoid arthritis, multiple sclerosis, and others. Enormous amounts of linkage disequilibrium in these regions are one factor, as is getting information in phase, so larger stretches of sequence are needed. Recently Geraghty has begun using SMRT Technology with hopes of drilling down to the causal genetics. 

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Wednesday, January 6, 2021

AGBT 2015 Highlights: Customer interviews day 1

PacBio customers discuss their applications of PacBio SMRT Sequencing and long reads, including Lemuel Racacho (Children’s Hospital of Eastern Ontario Research Institute), Matthew Blow (JGI), Yuta Suzuki (U. of Tokyo), Daniel Geraghty (Fred Hutchinson Cancer Center), and Mike Schatz (CSHL)

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Wednesday, January 6, 2021

Podcast: Long-read sequencing dramatically improves blood matching – Steven Marsh

One of the popular questions on the Mendelspod program is how those doing sequencing decide between the quality of PacBio’s long reads and the cheaper short read technology, such as that of Illumina or Thermo Fisher. Steve Marsh, the Director of Bioinformatics at the Anthony Nolan Research Institute in London, provides the most clear and dramatic answer yet: use the PacBio system exclusively. Established in 1974 by the mother of a boy with a rare blood disease, the Anthony Nolan Institute is a world leader in blood crossmatching and donor/patient registries. Steve and his team at the Institute have dramatically…

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Wednesday, January 6, 2021

ASHG Virtual Poster: The MHC Diversity in Africa Project (MDAP) pilot – 125 African high resolution HLA types from 5 populations

In this ASHG 2016 poster video, Martin Pollard from the Wellcome Trust Sanger Institute and the University of Cambridge describes an ambitious project to better represent natural variation in the complex MHC region by sequencing the locus in thousands of people from various populations in Africa. A pilot project in five populations has already revealed a lot of diversity in the region, which is important for human disease, vaccine response, and organ transplantation. Pollard says SMRT Sequencing is the only technology that can deliver the full-length haplotypes necessary to identify complete variation in this highly polymorphic complex. Plus: plans to…

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Wednesday, January 6, 2021

Webinar: PacBio targeted sequencing of long amplicons using PCR or hybrid capture

Targeted sequencing experiments commonly rely on either PCR or hybrid capture to enrich for targets of interest. When using short read sequencing platforms, these amplicons or fragments are frequently targeted to a few hundred base pairs to accommodate the read lengths of the platform. Given PacBio’s long readlength, it is straightforward to sequence amplicons or captured fragments that are multiple kilobases in length. These long sequences are useful for easily visualizing variants that include SNPs, CNVs and other structural variants, often without assembly. We will review methods for the sequencing of long amplicons and provide examples using amplicons that range…

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Wednesday, January 6, 2021

AGBT PacBio Workshop: High-throughput HLA class I whole gene and HLA class II long range typing on PacBio RSII and Sequel Platforms

In a talk at AGBT 2017, Histogenetics CEO Nezih Cereb reported on how SMRT Sequencing is allowing his team to produce full-length, phased sequences for HLA alleles, which are important for matching organ transplants to recipients. The company is typing thousands of samples per day on their PacBio RS II systems and their new Sequel System. Cereb noted that SMRT Sequencing is unique in its ability to reliably phase mutations in the HLA alleles without imputation. Cereb concluded with his plans to use this approach for other complex regions, such as KIR, and announced their continued increasing HLA typing capacity…

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Wednesday, January 6, 2021

Webinar: A paradigm shift in HLA sequencing: from exons to high-resolution allele-level HLA yyping

Human MHC class I genes HLA-A, -B, -C, and class II genes HLA -DR, -DQ, and -DP play a critical role in the immune system as primary factors responsible for organ transplant rejection. Additionally, the HLA genes are important targets for clinical and drug sensitivity research because of their direct or linkage-based association with several diseases, including cancer, and autoimmune diseases. HLA genes are highly polymorphic, and their diversity originates from exonic combinations as well as recombination events. With full-length gene sequencing, a significant increase of new alleles in the HLA database is expected, stressing the need for high-resolution sequencing.…

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Wednesday, January 6, 2021

User Group Meeting: No Assembly Required – Making the most of Iso-Seq data

In this PacBio User Group Meeting presentation, PacBio scientist Kristin Mars speaks about recent updates, such as the single-day library prep that’s now possible with the Iso-Seq Express workflow. She also notes that one SMRT Cell 8M is sufficient for most Iso-Seq experiments for whole transcriptome sequencing at an affordable price.

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Wednesday, January 6, 2021

Webinar: Opportunities for using PacBio Long-read sequencing for COVID-19 research

In this Labroots webinar, Meredith Ashby, Director of Microbial Genomics at PacBio, describes the utility of highly accurate long-read sequencing, known as HiFi sequencing, to understand the SARs-CoV-2 viral genome. HiFi sequencing enables mutation phasing and rare variant detection to understand viral stability and mutation rates, as well as providing insights into viral population structure for monitoring viral evolution. Ashby also shares how HiFi sequencing can be used to explore the host immune response to COVID-19, specifically by providing full-length sequencing of the B cell repertoire, IGH locus and HLA genes. Access additional COVID-19 Sequencing Tools and Resources.

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Wednesday, January 6, 2021

Webinar: Understanding SARS-CoV-2 and host immune response to COVID-19 with PacBio sequencing

Studying microbial genomics and infectious disease? Learn how the PacBio Sequel II System can help advance your research, with first-hand perspectives from scientists who are investigating SARS-CoV-2 and COVID-19. In this webinar, Melissa Laird-Smith (Mt. Sinai School of Medicine) discusses her work evaluating the impact of host immune restriction in health and disease with high resolution HLA typing. She is joined by Corey Watson (University of Louisville School of Medicine) who talks about overcoming complexity to elucidate the role of IGH haplotype diversity in antibody-mediated immunity. Hosted by Meredith Ashby, Director of Microbial Genomics at PacBio. Access additional PacBio resources…

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Tuesday, December 22, 2020

Comprehensive variant detection in a human genome with PacBio high-fidelity reads

Human genomic variations range in size from single nucleotide substitutions to large chromosomal rearrangements. Sequencing technologies tend to be optimized for detecting particular variant types and sizes. Short reads excel at detecting SNVs and small indels, while long or linked reads are typically used to detect larger structural variants or phase distant loci. Long reads are more easily mapped to repetitive regions, but tend to have lower per-base accuracy, making it difficult to call short variants. The PacBio Sequel System produces two main data types: long continuous reads (up to 100 kbp), generated by single passes over a long template,…

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Tuesday, December 22, 2020

Allele-level sequencing and phasing of full-length HLA class I and II genes using SMRT Sequencing technology

The three classes of genes that comprise the MHC gene family are actively involved in determining donor-recipient compatibility for organ transplant, as well as susceptibility to autoimmune diseases via cross-reacting immunization. Specifically, Class I genes HLA-A, -B, -C, and class II genes HLA-DR, -DQ and -DP are considered medically important for genetic analysis to determine histocompatibility. They are highly polymorphic and have thousands of alleles implicated in disease resistance and susceptibility. The importance of full-length HLA gene sequencing for genotyping, detection of null alleles, and phasing is now widely acknowledged. While DNA-sequencing-based HLA genotyping has become routine, only 7% of…

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Tuesday, December 22, 2020

HLA sequencing using SMRT Technology – High resolution and high throughput HLA genotyping in a clinical setting

Sequence based typing (SBT) is considered the gold standard method for HLA typing. Current SBT methods are rather laborious and are prone to phase ambiguity problems and genotyping uncertainties. As a result, the NGS community is rapidly seeking to remedy these challenges, to produce high resolution and high throughput HLA sequencing conducive to a clinical setting. Today, second generation NGS technologies are limited in their ability to yield full length HLA sequences required for adequate phasing and identification of novel alleles. Here we present the use of single molecule real time (SMRT) sequencing as a means of determining full length/long…

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