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Friday, April 23, 2021

Application Brief: Targeted sequencing for amplicons – Best Practices

With Single Molecule, Real-Time (SMRT) Sequencing and the Sequel System, you can easily and cost effectively generate highly accurate long reads (HiFi reads, >99% single-molecule accuracy) from genes or regions of interest ranging in size from several hundred base pairs to 20 kb. Target all types of variation across relevant genomic regions, including low complexity regions like repeat expansions, promoters, and flanking regions of transposable elements.

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Friday, February 26, 2021

A novel analytical pipeline for de novo haplotype phasing and amplicon analysis using SMRT Sequencing technology.

While the identification of individual SNPs has been readily available for some time, the ability to accurately phase SNPs and structural variation across a haplotype has been a challenge. With individual reads of an average length of 9 kb (P5-C3), and individual reads beyond 30 kb in length, SMRT Sequencing technology allows the identification of mutation combinations such as microdeletions, insertions, and substitutions without any predetermined reference sequence. Long- amplicon analysis is a novel protocol that identifies and reports the abundance of differing clusters of sequencing reads within a single library. Graphs generated via hierarchical clustering of individual sequencing reads…

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Friday, February 26, 2021

Long Amplicon Analysis: Highly accurate, full-length, phased, allele-resolved gene sequences from multiplexed SMRT Sequencing data.

The correct phasing of genetic variations is a key challenge for many applications of DNA sequencing. Allele-level resolution is strongly preferred for histocompatibility sequencing where recombined genes can exhibit different compatibilities than their parents. In other contexts, gene complementation can provide protection if deleterious mutations are found on only one allele of a gene. These problems are especially pronounced in immunological domains given the high levels of genetic diversity and recombination seen in regions like the Major Histocompatibility Complex. A new tool for analyzing Single Molecule, Real-Time (SMRT) Sequencing data – Long Amplicon Analysis (LAA) – can generate highly accurate,…

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Friday, February 26, 2021

Mitochondrial DNA sequencing using PacBio SMRT technology

Mitochondrial DNA (mtDNA) is a compact, double-stranded circular genome of 16,569 bp with a cytosine-rich light (L) chain and a guanine-rich heavy (H) chain. mtDNA mutations have been increasingly recognized as important contributors to an array of human diseases such as Parkinson’s disease, Alzheimer’s disease, colorectal cancer and Kearns–Sayre syndrome. mtDNA mutations can affect all of the 1000-10,000 copies of the mitochondrial genome present in a cell (homoplasmic mutation) or only a subset of copies (heteroplasmic mutation). The ratio of normal to mutant mtDNAs within cells is a significant factor in whether mutations will result in disease, as well as…

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Friday, February 26, 2021

High-throughput SMRT Sequencing of clinically relevant targets

Targeted sequencing with Sanger as well as short read based high throughput sequencing methods is standard practice in clinical genetic testing. However, many applications beyond SNP detection have remained somewhat obstructed due to technological challenges. With the advent of long reads and high consensus accuracy, SMRT Sequencing overcomes many of the technical hurdles faced by Sanger and NGS approaches, opening a broad range of untapped clinical sequencing opportunities. Flexible multiplexing options, highly adaptable sample preparation method and newly improved two well-developed analysis methods that generate highly-accurate sequencing results, make SMRT Sequencing an adept method for clinical grade targeted sequencing. The…

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Friday, February 5, 2021

Tutorial: Long amplicon analysis application [SMRT Link v5.0.0]

This tutorial provides an overview of the Long Amplicon Analysis (LAA) application. The LAA algorithm generates highly accurate, phased and full-length consensus sequences from long amplicons. Applications of LAA include HLA typing, alternative haplotyping, and localized de novo assemblies of targeted genes. This tutorial covers features of SMRT Link v5.0.0.

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Friday, February 5, 2021

AGBT Virtual Poster: Single-molecule sequencing reveals the presence of distinct JC polyomavirus populations in patients with progressive multifocal leukoencephalopathy

At AGBT 2017, Lars Paulin from the University of Helsinki presented this poster on whole genome sequencing of the virus responsible for progressive multifocal leukoencephalopathy, a rare and dangerous brain infection. His team used long amplicon analysis to resolve the whole virus genome from three patient samples, pooled them for SMRT Sequencing, and identified variants and rearrangements. This work represents the first time the viral genome was sequenced from patients.

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Friday, February 5, 2021

Webinar: Beginner’s guide to PacBio SMRT Sequencing data analysis

PacBio SMRT Sequencing is fast changing the genomics space with its long reads and high consensus sequence accuracy, providing the most comprehensive view of the genome and transcriptome. In this webinar, I will talk about the various data analysis tools available in PacBio’s data analysis suite – SMRT Link – as well as 3rd party tools available. Key applications addressed in this talk are: Genome Assemblies, Structural Variant Analysis, Long Amplicon and Targeted Sequencing, Barcoding Strategies, Iso-Seq Analysis for Full-length Transcript Sequencing

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