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Friday, February 5, 2021

Webinar: Discover full-length RNA sequencing – No assembly required

In this webinar we present Single Molecule, Real-Time (SMRT) Sequencing and the Iso-Seq method, which allow you to generate full-length cDNA sequences — no assembly required — to characterize transcript isoforms within targeted genes or across an entire transcriptome. The presenters share how the Iso-Seq method: (1) Provides high quality, full-length transcript sequences of up to 15 kb; (2) Allows for one-day library prep on a single SMRT Cell 8M to comprehensively characterize a whole transcriptome; (3) Facilitates discovery of alternative splicing events, fusion gene detection, and allelic specific isoform detection; and (4) Enables discovery of potential cancer-specific isoforms in…

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Friday, February 5, 2021

Webinar: Sequencing 101 – How long-read sequencing improves access to genetic information

In this webinar, Kristin Mars, Sequencing Specialist, PacBio, presents an introduction to PacBio’s technology and its applications followed by a panel discussion among sequencing experts. The panel discussion addresses such things as what long reads are and how are they useful, what differentiates PacBio long-read sequencing from other technologies, and the applications PacBio offers and how they can benefit scientific research.

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Friday, February 5, 2021

Webinar: Bioinformatics lunch & learn – HiFi assembly

The release of the PacBio Sequel II System in 2019 brought dramatic throughput improvements and protocols for producing a new data type, highly accurate long reads or HiFi reads. PacBio is the only sequencing technology to offer highly accurate long reads (HiFi reads) that provide Sanger-quality accuracy (>99%) with the read lengths needed for assembly of complex genomes. The long length and high accuracy of HiFi reads makes them the ideal starting point for many applications, and one area of major interest is genome assembly. HiFi assembly is faster, cheaper, more accurate, and easier to phase than standard long-read assembly.…

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Friday, February 5, 2021

Video: Introduction to PacBio highly accurate long-read sequencing

PacBio Sequencing is powered by Single Molecule, Real-Time (SMRT) Sequencing technology. The Sequel II System offers the affordable, highly accurate long reads needed to gain comprehensive views of genomes, transcriptomes, and epigenomes. Watch this video to get to know the Sequel II System, explore the key advantages of SMRT Sequencing, and learn how its applications can be used to drive new discoveries.

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Friday, February 5, 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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Friday, February 5, 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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Friday, February 5, 2021

ASHG PacBio Workshop: Latest product and application updates

In this ASHG 2020 PacBio Workshop Jonas Korlach, CSO, shares how the new PacBio Sequel IIe System makes highly accurate long-read sequencing easy and affordable so?all scientists can gain comprehensive views of human genomes and transcriptomes. He goes on to provide updates on the applications including human WGS for variant detection, de novo genome assembly, single-cell full-length RNA sequencing, and targeted sequencing using PCR and No-Amp methods.

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Tuesday, April 21, 2020

Profiling the genome-wide landscape of tandem repeat expansions.

Tandem repeat (TR) expansions have been implicated in dozens of genetic diseases, including Huntington’s Disease, Fragile X Syndrome, and hereditary ataxias. Furthermore, TRs have recently been implicated in a range of complex traits, including gene expression and cancer risk. While the human genome harbors hundreds of thousands of TRs, analysis of TR expansions has been mainly limited to known pathogenic loci. A major challenge is that expanded repeats are beyond the read length of most next-generation sequencing (NGS) datasets and are not profiled by existing genome-wide tools. We present GangSTR, a novel algorithm for genome-wide genotyping of both short and…

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Tuesday, April 21, 2020

Genome-Scale Sequence Disruption Following Biolistic Transformation in Rice and Maize.

Biolistic transformation delivers nucleic acids into plant cells by bombarding the cells with microprojectiles, which are micron-scale, typically gold particles. Despite the wide use of this technique, little is known about its effect on the cell’s genome. We biolistically transformed linear 48-kb phage lambda and two different circular plasmids into rice (Oryza sativa) and maize (Zea mays) and analyzed the results by whole genome sequencing and optical mapping. Although some transgenic events showed simple insertions, others showed extreme genome damage in the form of chromosome truncations, large deletions, partial trisomy, and evidence of chromothripsis and breakage-fusion bridge cycling. Several transgenic…

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Tuesday, April 21, 2020

A 12-kb structural variation in progressive myoclonic epilepsy was newly identified by long-read whole-genome sequencing.

We report a family with progressive myoclonic epilepsy who underwent whole-exome sequencing but was negative for pathogenic variants. Similar clinical courses of a devastating neurodegenerative phenotype of two affected siblings were highly suggestive of a genetic etiology, which indicates that the survey of genetic variation by whole-exome sequencing was not comprehensive. To investigate the presence of a variant that remained unrecognized by standard genetic testing, PacBio long-read sequencing was performed. Structural variant (SV) detection using low-coverage (6×) whole-genome sequencing called 17,165 SVs (7,216 deletions and 9,949 insertions). Our SV selection narrowed down potential candidates to only five SVs (two deletions…

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Tuesday, April 21, 2020

Accurate circular consensus long-read sequencing improves variant detection and assembly of a human genome.

The DNA sequencing technologies in use today produce either highly accurate short reads or less-accurate long reads. We report the optimization of circular consensus sequencing (CCS) to improve the accuracy of single-molecule real-time (SMRT) sequencing (PacBio) and generate highly accurate (99.8%) long high-fidelity (HiFi) reads with an average length of 13.5 kilobases (kb). We applied our approach to sequence the well-characterized human HG002/NA24385 genome and obtained precision and recall rates of at least 99.91% for single-nucleotide variants (SNVs), 95.98% for insertions and deletions <50 bp (indels) and 95.99% for structural variants. Our CCS method matches or exceeds the ability of…

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Tuesday, April 21, 2020

Metagenomic assembly through the lens of validation: recent advances in assessing and improving the quality of genomes assembled from metagenomes.

Metagenomic samples are snapshots of complex ecosystems at work. They comprise hundreds of known and unknown species, contain multiple strain variants and vary greatly within and across environments. Many microbes found in microbial communities are not easily grown in culture making their DNA sequence our only clue into their evolutionary history and biological function. Metagenomic assembly is a computational process aimed at reconstructing genes and genomes from metagenomic mixtures. Current methods have made significant strides in reconstructing DNA segments comprising operons, tandem gene arrays and syntenic blocks. Shorter, higher-throughput sequencing technologies have become the de facto standard in the field.…

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Tuesday, April 21, 2020

Genome analysis of the rice coral Montipora capitata.

Corals comprise a biomineralizing cnidarian, dinoflagellate algal symbionts, and associated microbiome of prokaryotes and viruses. Ongoing efforts to conserve coral reefs by identifying the major stress response pathways and thereby laying the foundation to select resistant genotypes rely on a robust genomic foundation. Here we generated and analyzed a high quality long-read based ~886 Mbp nuclear genome assembly and transcriptome data from the dominant rice coral, Montipora capitata from Hawai’i. Our work provides insights into the architecture of coral genomes and shows how they differ in size and gene inventory, putatively due to population size variation. We describe a recent…

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Tuesday, April 21, 2020

A high-quality de novo genome assembly from a single mosquito using PacBio sequencing

A high-quality reference genome is a fundamental resource for functional genetics, comparative genomics, and population genomics, and is increasingly important for conservation biology. PacBio Single Molecule, Real-Time (SMRT) sequencing generates long reads with uniform coverage and high consensus accuracy, making it a powerful technology for de novo genome assembly. Improvements in throughput and concomitant reductions in cost have made PacBio an attractive core technology for many large genome initiatives, however, relatively high DNA input requirements (~5 µg for standard library protocol) have placed PacBio out of reach for many projects on small organisms that have lower DNA content, or on…

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Tuesday, April 21, 2020

Progression of the canonical reference malaria parasite genome from 2002-2019.

Here we describe the ways in which the sequence and annotation of the Plasmodium falciparum reference genome has changed since its publication in 2002. As the malaria species responsible for the most deaths worldwide, the richness of annotation and accuracy of the sequence are important resources for the P. falciparum research community as well as the basis for interpreting the genomes of subsequently sequenced species. At the time of publication in 2002 over 60% of predicted genes had unknown functions. As of March 2019, this number has been significantly decreased to 33%. The reduction is due to the inclusion of…

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