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July 17, 2019

Webinar: Variant calling and de novo genome assembly with PacBio HiFi reads

In this webinar, Sarah Kingan, Staff Scientist, PacBio, presents recent work on de novo genome assembly using PacBio HiFi reads. She highlights the benefits of HiFi data for base level accuracy, haplotype phasing, and ease of computation. And in samples ranging from human to plants, she benchmarks various tools for HiFi assembly and phasing, including the newly extended FALCON-Unzip assembler. Subsequently, Andrew Carroll, Genomics Product Lead, GoogleAI, explores how the GoogleAI team retrained DeepVariant, a highly accurate SNP and Indel caller, for PacBio HiFi data. The resulting DeepVariant models achieve comparable accuracies to short-read methods with the additional benefit of…

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July 9, 2019

Single cell isoform sequencing (scIso-Seq) identifies novel full-length mRNAs and cell type-specific expression

Single cell RNA-seq (scRNA-seq) is an emerging field for characterizing cell heterogeneity in complex tissues. However, most scRNA-seq methodologies are limited to gene count information due to short read lengths. Here, we combine the microfluidics scRNA-seq technique, Drop-Seq, with PacBio Single Molecule, Real-Time (SMRT) Sequencing to generate full-length transcript isoforms that can be confidently assigned to individual cells. We generated single cell Iso-Seq (scIso-Seq) libraries for chimp and human cerebral organoid samples on the Dolomite Nadia platform and sequenced each library with two SMRT Cells 8M on the PacBio Sequel II System. We developed a bioinformatics pipeline to identify, classify,…

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June 20, 2019

High-resolution evaluation of gut microbiota associated with intestinal maturation in early preterm neonates

Leaky gut, or intestinal barrier immaturity with elevated intestinal permeability, is the proximate cause of susceptibility to necrotizing enterocolitis in preterm neonates. We recently revealed intestinal barrier maturation was associated with exclusive breastfeeding, less antibiotic exposure, most importantly, altered composition of the gut microbiota. However, sequencing short regions of 16S rRNA gene amplicon failed to identify the specific bacterial groups associated with improved or aberrant intestinal permeability. In this study, we performed high-throughput amplicon sequencing of the full length 16S rRNA gene with single-nucleotide resolution for a cohort of 66 preterm neonates born at 24-33 weeks of gestation who had…

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June 5, 2019

Webinar: Sequence with Confidence – Introducing the Sequel II System

In this webinar, Jonas Korlach, Chief Scientific Officer, PacBio provides an overview of the features and the advantages of the new Sequel II System. Kiran Garimella, Senior Computational Scientist, Broad Institute of MIT and Harvard University, describes his work sequencing humans with HiFi reads enabling discovery of structural variants undetectable in short reads. Luke Tallon, Scientific Director, Genomics Resource Center, Institute for Genome Sciences, University of Maryland School of Medicine, covers the GRC’s work on bacterial multiplexing, 16S microbiome profiling, and shotgun metagenomics. Finally, Shane McCarthy, Senior Research Associate, University of Cambridge, focuses on the scaling and affordability of high-quality…

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May 28, 2019

Improved assembly and variant detection of a haploid human genome using single-molecule, high-fidelity long reads

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 large tandem repeats, as validated with orthogonal analyses. Additionally, the HiFi genome assembly was generated in significantly less time with fewer computational resources than the CLR assembly. Although the…

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May 1, 2019

A High-Quality Genome Assembly from a Single, Field collected Spotted Lanternfly (Lycorma delicatula) using the PacBio Sequel II System

A high-quality reference genome is an essential tool for applied and basic research on arthropods. Long-read sequencing technologies may be used to generate more complete and contiguous genome assemblies than alternate technologies, however, long-read methods have historically had greater input DNA requirements and higher costs than next generation sequencing, which are barriers to their use on many samples. Here, we present a 2.3 Gb de novo genome assembly of a field-collected adult female Spotted Lanternfly (Lycorma delicatula) using a single PacBio SMRT Cell. The Spotted Lanternfly is an invasive species recently discovered in the northeastern United States, threatening to damage…

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April 23, 2019

Application Brief: Structural variant detection using whole genome sequencing – Best Practices

With the Sequel II System powered by Single Molecule, Real-Time (SMRT) Sequencing technology and SMRT Link v7.0, you can affordably and effectively detect structural variants (SVs), copy number variants, and large indels ranging in size from tens to thousands of base pairs. PacBio long-read whole genome sequencing comprehensively resolves variants in an individual with high precision and recall. For population genetics and pedigree studies, joint calling powers rapid discovery of common variants within a sample cohort.

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April 23, 2019

Application Brief: Whole genome sequencing for de novo assembly – Best Practices

Single Molecule, Real-Time (SMRT) Sequencing on the Sequel II System enables easy and affordable generation of high-quality de novo assemblies of even the most complex genomes. With megabase-size contig N50s, consensus accuracies >99.99%, and tools for phasing haplotypes you can capture undetected SNVs, fully intact genes, and regulatory regions embedded in complex structures that fragmented draft genomes often miss.

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