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Thursday, January 7, 2021

Case Study: Pioneering a pan-genome reference collection

At DuPont Pioneer, DNA sequencing is paramount for R&D to reveal the genetic basis for traits of interest in commercial crops such as maize, soybean, sorghum, sunflower, alfalfa, canola, wheat, rice, and others. They cannot afford to wait the years it has historically taken for high-quality reference genomes to be produced. Nor can they rely on a single reference to represent the genetic diversity in its germplasm.

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Wednesday, January 6, 2021

Video: Using the Integrative Genomics Viewer (IGV) to visualize PacBio long-read SMRT Sequencing data

In this video, PacBio scientists present ongoing improvements to the Integrative Genomics Viewer (IGV) and demonstrate how multiple new features improve visualization support for PacBio long-read sequencing data. The video describes these recent updates which include; quick consensus accuracy mode to hide random single-molecule errors, direct phasing of haplotypes using long-read evidence, and visual annotation of insertions and deletions relative to the reference with enumeration of gap size for individual reads. These new features are available now in the development version of IGV, which can be found at http://software.broadinstitute.org/software/igv/download_snapshot. The Sequel sequencing data used in this demonstration is also publicly…

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Wednesday, January 6, 2021

ASHG Virtual Poster: Enrichment of unamplified DNA and long-read SMRT Sequencing to unlock repeat expansion disorders

PacBio’s Jenny Ekholm presents this ASHG 2016 poster on a new method being developed that enriches for unamplified DNA and uses SMRT Sequencing to characterize repeat expansion disorders. Incorporating the CRISPR/Cas9 system to target specific genes allows for amplification-free enrichment to preserve epigenetic information and avoid PCR bias. Internal studies have shown that the approach can successfully be used to target and sequence the CAG repeat responsible for Huntington’s disease, the repeat associated with ALS, and more. The approach allows for pooling many samples and sequencing with a single SMRT Cell.

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Wednesday, January 6, 2021

ASHG PacBio Workshop: SMRT Sequencing as a translational research tool to investigate germline, somatic and infectious diseases

Melissa Laird Smith discussed how the Icahn School of Medicine at Mount Sinai uses long-read sequencing for translational research. She gave several examples of targeted sequencing projects run on the Sequel System including CYP2D6, phased mutations of GLA in Fabry’s disease, structural variation breakpoint validation in glioblastoma, and full-length immune profiling of TCR sequences.

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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

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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Wednesday, January 6, 2021

Webinar: Bioinformatics lunch & learn – Better assemblies of bacterial genomes and plasmids with the new microbial assembly pipeline in SMRT Link v8.0

Microbial Assembly is our latest pipeline, specifically designed to assemble bacterial genomes (between 2 and 10 Mb) and plasmids. This pipeline includes the implementation of a new, circular-aware read alignment tool (Raptor), among other algorithmic improvements, which will be covered in this webinar. The topics covered include, staged assembly of bacterial chromosomes and plasmids, implementation of Raptor, a circular-aware read aligner, himeric read detection, origin of replication orientation, troubleshooting and more.

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Wednesday, January 6, 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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Wednesday, January 6, 2021

Video Poster: Full-length RNA sequencing of Alzheimer brain sample using long reads reveals complex alternative splicing patterns

Long-read mRNA sequencing such as PacBio’s Iso-Seq method offer high-throughput transcriptome profiling that circumvents the transcript assembly problem by sequencing full-length cDNA. The Iso-Seq method has emerged as the most reliable technology for fully characterizing isoforms and, in turn, help shed light on underlying disease mechanisms. Here, we have utilized the Iso-Seq method to sequence an Alzheimer’s disease whole brain?sample. This is a devastating neurodegenerative disease that affects ~44 million people worldwide, making it the most common form of dementia. Studies looking into disease mechanism have shown that changes in gene expression due to alternative splicing likely contribute to the…

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Tuesday, December 22, 2020

TLA & long-read sequencing: Efficient targeted sequencing and phasing of the CFTR gene

Background: The sequencing and haplotype phasing of entire gene sequences improves the understanding of the genetic basis of disease and drug response. One example is cystic fibrosis (CF). Cystic fibrosis transmembrane conductance regulator (CFTR) modulator therapies have revolutionized CF treatment, but only in a minority of CF subjects. Observed heterogeneity in CFTR modulator efficacy is related to the range of CFTR mutations; revertant mutations can modify the response to CFTR modulators, and other intronic variations in the ~200 kb CFTR gene have been linked to disease severity. Heterogeneity in the CFTR gene may also be linked to differential responses to…

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Tuesday, December 22, 2020

Structural variant in the RNA Binding Motif Protein, X-Linked 2 (RBMX2) gene found to be linked to bipolar disorder

Bipolar disorder (BD) is a phenotypically and genetically complex neurological disorder that affects 1% of the worldwide population. There is compelling evidence from family, twin and adoption studies supporting the involvement of a genetic predisposition with estimated heritability up to ~ 80%. The risk in first-degree relatives is ten times higher than in the general population. Linkage and association studies have implicated multiple putative chromosomal loci for BD susceptibility, however no disease genes have yet to be identified. Here, we have fully characterized a ~12 Mb significantly linked (lod score=3.54) genomic region on chromosome Xq24-q27 in an extended family from…

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Tuesday, December 22, 2020

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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Tuesday, December 22, 2020

Integrative biology of a fungus: Using PacBio SMRT Sequencing to interrogate the genome, epigenome, and transcriptome of Neurospora crassa.

PacBio SMRT Sequencing has the unique ability to directly detect base modifications in addition to the nucleotide sequence of DNA. Because eukaryotes use base modifications to regulate gene expression, the absence or presence of epigenetic events relative to the location of genes is critical to elucidate the function of the modification. Therefore an integrated approach that combines multiple omic-scale assays is necessary to study complex organisms. Here, we present an integrated analysis of three sequencing experiments: 1) DNA sequencing, 2) base-modification detection, and 3) Iso-seq analysis, in Neurospora crassa, a filamentous fungus that has been used to make many landmark…

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