Jonas Korlach, CSO of PacBio, discusses the revival of finished genomes the microbial community will see with long read data, emphasizing that for certain organisms such as rapidly evolving microbes, having a de novo finished genome will be more useful than creating a draft based on a previous related reference genome. Korlach describes two bioinformatic methods from PacBio, a hierarchical genome assembly process (HGAP) and an consensus caller (Quiver), which are used to generate finished genomes from just long-read PacBio data, with final genome sequence accuracies over 99.999%. Korlach demonstrates the ability of PacBio data to generate closed, high-quality de…
Winston Timp from Johns Hopkins University studies the metabolism of hummingbirds, which sustain the highest metabolic rates among all vertebrates. Notably, hummingbirds can switch rapidly between a fuel of lipids to newly ingested sugars. This remarkable metabolism is supported by enzymes which operate at the extreme limit of catalytic efficiency. Understanding the molecular basis of enzymatic action will provide a foundation enabling rational engineering of metabolic circuits in other systems. To do this, Dr. Timp and his team generated a de novo transcriptome of the hummingbird liver using the Iso-Seq method. Characterization of the resulting protein coding sequences provides clues…
Karyn Meltz Steinberg presents the first high quality African reference genome assembly of the Yoruban individual, NA19240, produced from SMRT Sequencing data. She said PacBio sequencing offers significant improvement over short-read sequence data for high-quality assemblies.
In this poster presentation, PacBio scientist Ellen Paxinos describes an improved algorithm for circular consensus reads. Using this new algorithm, dubbed CCS2, it is possible to reach arbitrarily high quality across longer insert lengths at a lower cost and higher throughput than Sanger Sequencing. She shows results from the application of CCS2 to the characterization of the HIV-1 K103N drug-resistance associated mutation, which is both important clinically, and represents a challenge due to regional sequence context.
PacBio Sequencing is characterized by very long sequence reads (averaging > 10,000 bases), lack of GC-bias, and high consensus accuracy. These features have allowed the method to provide a new gold standard in de novo genome assemblies, producing highly contiguous (contig N50 > 1 Mb) and accurate (> QV 50) genome assemblies. We will briefly describe the technology and then highlight the full workflow, from sample preparation through sequencing to data analysis, on examples of insect genome assemblies, and illustrate the difference these high-quality genomes represent with regard to biological insights, compared to fragmented draft assemblies generated by short-read sequencing.
In this AGBT 2017 poster, Ulf Gyllensten from Uppsala University presents two local reference genomes generated with PacBio and Bionano Genomics data. These assemblies include structural variation and repetitive regions that have been missed with previous short-read efforts, including some new genes not annotated in the human reference genome.
This tutorial provides an overview of the Hierarchical Genome Assembly Process (HGAP4) de novo assembly analysis application. HGAP4 generates accurate de novo assemblies using only PacBio data. HGAP4 is suitable for assembling a wide range of genome sizes and complexity. HGAP4 now includes some support for diploid-aware assembly. This tutorial covers features of SMRT Link v5.0.0.
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…
In this AGBT 2017 talk, PacBio CSO Jonas Korlach provided a technology roadmap for the Sequel System, including plans the continue performance and throughput increases through early 2019. Per SMRT Cell throughput of the Sequel System is expected to double this year and again next year. Together with a new higher-capacity SMRT Cell expected to be released by the end of 2018, these improvements result in a ~30-fold increase or ~150 Gb / SMRT Cell allowing a real $1000 real de novo human genome assembly. Also discussed: Additional application protocol improvements, new chemistry and software updates, and a look at…
Long-read sequencing technologies like Iso-Seq analysis present researchers with a powerful tool for probing the transcriptomes of many species. The ability to sequence transcripts from end-to-end has revealed transcription complexity on a scale that was previously impossible. This sequence rich information has also improved our ability to predict transcript functions and biotypes. Researchers can now use Iso-Seq analysis to discover transcript models in almost any species with an accuracy on par with human and mouse annotations. In this webinar, Richard Kuo discusses the core concepts behind Iso-Seq analysis and how to use it to improve or build a new transcriptome…
In this webinar, Emily Hatas of PacBio shares information about the applications and benefits of SMRT Sequencing in plant and animal biology, agriculture, and industrial research fields. This session contains an overview of several applications: whole-genome sequencing for de novo assembly; transcript isoform sequencing (Iso-Seq) method for genome annotation; targeted sequencing solutions; and metagenomics and microbial interactions. High-level workflows and best practices are discussed for key applications.
In this PacBio User Group Meeting presentation, Mitchell Vollger of the University of Washington used HiFi reads from SMRT Sequencing to study segmental duplications in the human genome. The technique significantly reduced the complexity of accurately mapping these nearly identical sequences throughout the genome; it also reduced the amount of compute power needed compared to a previous PacBio assembly using continuous long reads instead of circular consensus sequencing. Despite generating less data with the HiFi assembly, the team still resolved 30% more segmental duplications with the new approach.
In this webinar, Adam Ameur of SciLifeLab at Uppsala University shares how he uses Single Molecule, Real-Time (SMRT) Sequencing applications for medical diagnostics and human genetics research, including sequencing of single genes and de novo assembly of human genomes as well as a new method for detection of CRISPR-Cas9 off-targets.
The sequence and assembly of human genomes using long-read sequencing technologies has revolutionized our understanding of structural variation and genome organization. We compared the accuracy, continuity, and gene annotation of genome assemblies generated from either high-fidelity (HiFi) or continuous long-read (CLR) datasets from the same complete hydatidiform mole human genome. We find that the HiFi sequence data assemble an additional 10% of duplicated regions and more accurately represent the structure of tandem repeats, as validated with orthogonal analyses. As a result, an additional 5 Mbp of pericentromeric sequences are recovered in the HiFi assembly, resulting in a 2.5-fold increase in…