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Thursday, August 27, 2020

Case Study: Scientists create gold standard plant and animal genomes with SMRT Sequencing

From crop improvement to breeding healthier livestock to modeling human disease, scientists are using PacBio Sequencing to advance understanding of plant and animal genomes. In this article, we look at four examples of plant and animal genome references improved or made possible with SMRT Sequencing, including an early example of transcriptome sequencing of a chicken for improved annotation. These examples highlight insights gained with SMRT Sequencing that are missed with short-read data, such as complex regions or novel genes.

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Thursday, August 27, 2020

Immunology Brochure: Invaluable insights into immunology

In order to understand the molecular mechanisms governing the outcomes of disease, health and survival, immunologists have to characterize exceptionally complex genomic regions, like major histocompatibility complex (MHC), killer cell immune receptors (KIR), and the B and T-cell immune repertoire. Single Molecule, Real-Time (SMRT) Sequencing delivers the long read lengths, uniform coverage and high accuracy necessary to comprehensively and confidently resolve these immune sub-genomic regions. The granularity of data generated by PacBio® reads provides new access to imputation-free characterization of genes and haplotypes for invaluable genomic insights to advance disease association and evolutionary research.

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Thursday, August 27, 2020

HLA Sequencing Application Brochure: Fully phased, allele-specific HLA sequencing – the perfect pair

Single Molecule Real-Time (SMRT) Sequencing delivers reads that span the lengths of the majority of HLA class I and II genes. Unambiguously phase 4-field HLA types without imputation. With a more accurate and complete picture, gain deeper understanding of immune-related disease causality, graft-versus-host disease in hematopoietic transplantation, and drug hypersensitivity.

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Thursday, August 27, 2020

Whitepaper: Structural variation in the human genome

Structural variation accounts for much of the variation among human genomes. Structural variants of all types are known to cause Mendelian disease and contribute to complex disease. Learn how long-read sequencing is enabling detection of the full spectrum of structural variants to advance the study of human disease, evolution and genetic diversity.

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Thursday, August 27, 2020

De Novo Assembly Brochure: Assembly options for your SMRT Sequencing data

It is now easier and more affordable than ever to do a genome project with PacBio Single Molecule, Real-Time (SMRT) Sequencing—the gold standard for generating contiguous, highly accurate reference genomes. Assembly is no longer a challenge with the wealth of bioinformatics tools developed and optimized for SMRT Sequencing data, enabling you to generate high-quality genome assemblies on any budget.

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Thursday, August 27, 2020

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 v8.0, 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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Wednesday, May 13, 2020

Webinar: Understanding SARS-CoV-2 and host immune response to COVID-19 with PacBio sequencing

Studying microbial genomics and infectious disease? Learn how the PacBio Sequel II System can help advance your research, with first-hand perspectives from scientists who are investigating SARS-CoV-2 and COVID-19. In this webinar, Melissa Laird-Smith (Mt. Sinai School of Medicine) discusses her work evaluating the impact of host immune restriction in health and disease with high resolution HLA typing. She is joined by Corey Watson (University of Louisville School of Medicine) who talks about overcoming complexity to elucidate the role of IGH haplotype diversity in antibody-mediated immunity. Hosted by Meredith Ashby, Director of Microbial Genomics at PacBio. Access additional PacBio resources…

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Tuesday, April 21, 2020

Long-read sequencing for rare human genetic diseases.

During the past decade, the search for pathogenic mutations in rare human genetic diseases has involved huge efforts to sequence coding regions, or the entire genome, using massively parallel short-read sequencers. However, the approximate current diagnostic rate is

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Tuesday, April 21, 2020

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 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…

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Tuesday, April 21, 2020

Tandem repeats lead to sequence assembly errors and impose multi-level challenges for genome and protein databases.

The widespread occurrence of repetitive stretches of DNA in genomes of organisms across the tree of life imposes fundamental challenges for sequencing, genome assembly, and automated annotation of genes and proteins. This multi-level problem can lead to errors in genome and protein databases that are often not recognized or acknowledged. As a consequence, end users working with sequences with repetitive regions are faced with ‘ready-to-use’ deposited data whose trustworthiness is difficult to determine, let alone to quantify. Here, we provide a review of the problems associated with tandem repeat sequences that originate from different stages during the sequencing-assembly-annotation-deposition workflow, and…

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Tuesday, April 21, 2020

Chlorella vulgaris genome assembly and annotation reveals the molecular basis for metabolic acclimation to high light conditions.

Chlorella vulgaris is a fast-growing fresh-water microalga cultivated at the industrial scale for applications ranging from food to biofuel production. To advance our understanding of its biology and to establish genetics tools for biotechnological manipulation, we sequenced the nuclear and organelle genomes of Chlorella vulgaris 211/11P by combining next generation sequencing and optical mapping of isolated DNA molecules. This hybrid approach allowed to assemble the nuclear genome in 14 pseudo-molecules with an N50 of 2.8 Mb and 98.9% of scaffolded genome. The integration of RNA-seq data obtained at two different irradiances of growth (high light-HL versus low light -LL) enabled…

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Tuesday, April 21, 2020

A robust benchmark for germline structural variant detection

New technologies and analysis methods are enabling genomic structural variants (SVs) to be detected with ever-increasing accuracy, resolution, and comprehensiveness. Translating these methods to routine research and clinical practice requires robust benchmark sets. We developed the first benchmark set for identification of both false negative and false positive germline SVs, which complements recent efforts emphasizing increasingly comprehensive characterization of SVs. To create this benchmark for a broadly consented son in a Personal Genome Project trio with broadly available cells and DNA, the Genome in a Bottle (GIAB) Consortium integrated 19 sequence-resolved variant calling methods, both alignment- and de novo assembly-based,…

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Tuesday, April 21, 2020

Updated assembly resource of Phytophthora ramorum Pr102 isolate incorporating long reads from PacBio sequencing.

The NA1 clonal lineage of Phytophthora ramorum is responsible for Sudden Oak Death, an epidemic that has devastated California’s coastal forest ecosystems. An NA1 isolate Pr102 derived from coast live oak in California was previously sequenced and reported with 65 Mb assembly containing 12 Mb gaps in 2576 scaffolds. Here we report an improved 70 Mb genome in 1512 scaffolds with 6752 bp gaps after incorporating PacBio P5-C3 longreads. This assembly contains 19494 gene models (average gene length 2515 bp) compared to 16134 genes (average gene length of 1673 bp) in the previous version. We predicted 29 new RXLRs and…

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Tuesday, April 21, 2020

Large Fragment Deletions Induced by Cas9 Cleavage While Not in BEs System in Rabbit

CRISPR-Cas9 and BEs system are poised to become the gene editing tool of choice in clinical contexts, however large fragment deletion was found in Cas9-mediated mutation cells without animal level validation. By analyzing 16 gene-edited rabbit lines (including 112 rabbits) generated using SpCas9, BEs, xCas9 and xCas9-BEs with long-range PCR genotyping and long-read sequencing by PacBio platform, we show that extending thousands of bases fragment deletions in single-guide RNA/Cas9 and xCas9 system mutation rabbit, but few large deletions were found in BEs-induced mutation rabbits. We firstly validated that no large fragment deletion induced by BEs system at animal level, suggesting…

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Tuesday, April 21, 2020

The Chinese chestnut genome: a reference for species restoration

Forest tree species are increasingly subject to severe mortalities from exotic pests, diseases, and invasive organisms, accelerated by climate change. Forest health issues are threatening multiple species and ecosystem sustainability globally. While sources of resistance may be available in related species, or among surviving trees, introgression of resistance genes into threatened tree species in reasonable time frames requires genome-wide breeding tools. Asian species of chestnut (Castanea spp.) are being employed as donors of disease resistance genes to restore native chestnut species in North America and Europe. To aid in the restoration of threatened chestnut species, we present the assembly of…

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