Introduction: Around 5% (1,168) of protein-coding genes in the human genome contain an exon that is difficult to map with typical next-generation sequencing (NGS) read lengths due to homologous pseudogenes or segmental duplications. Among the difficult-to-map genes are 193 with known medical relevance, including CYP2D6, GBA, SMN1/2, and VWF. Long-read DNA sequencing provides increased mappability, accessing many of the difficult-to-map regions by connecting the homologous exon to neighboring unique sequence. Until recently, the read-level accuracy of long-read sequencing had made it challenging to accurately call small variants. The recently developed HiFi reads from the PacBio Sequel II System provide both…
In this SMRT Leiden 2020 Online Virtual Event presentation, Richard Kuo of The Roslin Institute shares his work on using Iso-Seq data to gain a better understanding of the biology of a species. Kuo demonstrates how these analyses can change the way we look at genome assemblies, differential gene expression, and functional annotation.
In this webinar, scientists from PacBio share how using Single Molecule, Real-Time (SMRT) Sequencing, you can generate highly accurate long reads – HiFi reads – with 99% accuracy (Q20) and read lengths of 10 kb or more. This high resolution of each single molecule enables species or strain-level profiling of complex populations in both targeted and shotgun sequencing experiments. Genome assemblies are more cost effective than ever before when sequencing metagenomics samples with the Sequel II System.
COVID-19 is caused by the infection of SARS-CoV-2, a member of the coronavirus family. Complete and accurate sequencing of the SARS-CoV-2 genome enables discovery and epidemiological tracing of mutations that may be important for antiviral and vaccine research. A complementary approach, sequencing the patients’ immune repertoire, allows for detection of neutralizing antibodies and understanding variation in the adaptive immune response. PacBio’s SMRT Sequencing uses circular consensus sequencing that can generate long, highly accurate (HiFi) reads. We find that a tiled multiplex PCR amplicon approach of ~1-2 kb fragments achieves a balanced tradeoff between ease of library preparation and robustness to…
In this ASHG 2020 CoLab presentation hear Principal Scientists, Aaron Wenger and Elizabeth Tseng share how highly accurate long reads (HiFi reads) provide comprehensive variant detection for both genomes and transcriptomes. Aaron Wenger describes how new improvements in protocols and analysis methods have increased scalability and accuracy of variant calling. As demonstrated in the precisionFDA Truth Challenge V2, HiFi reads (>99% accurate, 15 kb – 20 kb) now outperform short reads for single nucleotide and structural variant calling and match for small indels. This includes calling >30,000 small variants and >10,000 structural variants missed by short reads, many in medically…
In this PacBio Virtual Global Summit 2020 presentation, Meredith Ashby of PacBio shares how researchers are using PacBio HiFi sequencing to overcome common challenges in microbiome research, including ambiguous taxonomic assignments and culture-resistant bacteria.
In this PacBio Virtual Global Summit 2020 presentation, Lori Aro of PacBio shares how scientists are using highly accurate long read-sequencing to target clinically relavent gene and regions of interest.
In this PacBio Virtual Global Summit 2020 presentation, Jennifer Balacco of the Vertebrate Genome Lab at Rockefeller University describes experiences and findings towards pursuing error-free genomes at the Vertebrate Genome Lab. This includes sample prep tips and an example of a VGP high-quality reference genome generated from a museum specimen.
In this PacBio Virtual Global Summit 2020 presentation, Nicole Newell of PacBio provides an overview of the library preparation kits available for highly accurate long read (HiFi sequencing) applications.
In this PacBio Virtual Global Summit 2020 presentation, Evan Eichler of the University of Washington discusses approaches to apply long-read sequencing to generate complete telomere-to-telomere assembly of chromosomes. Eichler focuses on complex regions of structural variation and new biological insights from comparative analyses.
In this PacBio Virtual Global Summit 2020 presentation, Jeremy Schmutz of HudsonAlpha Institute describes applications for PacBio HiFi sequencing to detect structual variations and assembly human genomes, as well as for de novo assembly of plant species with complex genomes.
Recent advances in sequencing chemistry and software in the Sequel II System enable generating highly accurate long reads that are up to 25 kb in length with >99% accuracy. The high quality HiFi reads are suitable for variant detection of all types, from single nucleotides to structural variants. PacBio offers an end-to-end solution from sample preparation to data analysis. However, library construction is still a bottleneck making it difficult to implement into a high-throughput workflow for sequencing large number of samples. Input DNA requirements, DNA shearing and size-selection/fractionation are the most critical and challenging steps in the current procedure. In…
In this PacBio Virtual Global Summit 2020 presentation, Shawn Levy of Discovery Life Sciences shares work on how the ability to reliably detect and characterize the spectrum of sequence variants observed in the human genome is critical for understanding the role of mutation and variation in genetic risk and phenotype. Levy describes how scaled CCS analysis on the Sequel II System supports efficient and reliable detection of complex and simple variants in diverse populations with high accuracy.
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.
In this PacBio Virtual Global Summit 2020 presentation, Pi-Chuan Chang of Google shares how DeepVariant identifies SNPs and Indels in PacBio HiFi data, starting from the v0.8 release (April 2019). In her talk, Chang details recent accuracy improvements that won the PrecisionFDA Truth Challenge v2, which are now available in the latest release (v1.0 in September 2020).