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Thursday, August 19, 2021

Application Note: Considerations for using the low and ultra-low DNA input workflows for whole genome sequencing

As the foundation for scientific discoveries in genetic diversity, sequencing data must be accurate and complete. With highly accurate long-read sequencing, or HiFi sequencing, there is no longer a compromise between read length and accuracy. HiFi sequencing enables some of the highest quality de novo genome assemblies available today as well as comprehensive variant detection in human samples. PacBio HiFi libraries constructed using our standard library workflows require at least 3 µg of DNA input per 1 Gb of genome length, or ~10 µg for a human sample. For some samples it is not possible to extract this amount of…

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Tuesday, June 1, 2021

Every species can be a model: Reference-quality PacBio genomes from single insects

A high-quality reference genome is an essential resource for primary and applied research across the tree of life. Genome projects for small-bodied, non-model organisms such as insects face several unique challenges including limited DNA input quantities, high heterozygosity, and difficulty of culturing or inbreeding in the lab. Recent progress in PacBio library preparation protocols, sequencing throughput, and read accuracy address these challenges. We present several case studies including the Red Admiral (Vanessa atalanta), Monarch Butterfly (Danaus plexippus), and Anopheles malaria mosquitoes that highlight the benefits of sequencing single individuals for de novo genome assembly projects, and the ease at which…

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Tuesday, June 1, 2021

A high-quality PacBio insect genome from 5 ng of input DNA

High-quality insect genomes are essential resources to understand insect biology and to combat them as disease vectors and agricultural pests. It is desirable to sequence a single individual for a reference genome to avoid complications from multiple alleles during de novo assembly. However, the small body size of many insects poses a challenge for the use of long-read sequencing technologies which often have high DNA-input requirements. The previously described PacBio Low DNA Input Protocol starts with ~100 ng of DNA and allows for high-quality assemblies of single mosquitoes among others and represents a significant step in reducing such requirements. Here,…

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Tuesday, June 1, 2021

Low-input single molecule HiFi sequencing for metagenomic samples

HiFi sequencing on the PacBio Sequel II System enables complete microbial community profiling of complex metagenomic samples using whole genome shotgun sequences. With HiFi sequencing, highly accurate long reads overcome the challenges posed by the presence of intergenic and extragenic repeat elements in microbial genomes, thus greatly improving phylogenetic profiling and sequence assembly. Recent improvements in library construction protocols enable HiFi sequencing starting from as low as 5 ng of input DNA. Here, we demonstrate comparative analyses of a control sample of known composition and a human fecal sample from varying amounts of input genomic DNA (1 ug, 200 ng,…

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Friday, February 5, 2021

User Group Meeting: Low-input workflow for PacBio de novo genome assemblies

Jonas Korlach kicks off Day 2 of the 2018 User Group Meeting by discussing a recent collaboration and technique for low-input starting material and high quality de novo assembly projects. While new and not yet fully supported, many researchers have interest in starting with lower amounts of DNA for whole genome sequencing. This protocol requires Express Kit v2, which will be available in early 2019.

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Friday, February 5, 2021

PAG Conference: Reference-quality drosophila genome assemblies for evolutionary analysis of previously inaccessible genomic regions

In this presentation, Andrew Clark from Cornell University describes work from a collaboration with Manyuan Long of the University of Chicago and Rod Wing of the University of Arizona to look at heterochromatic regions with long simple satellite repeats in drosophila genomes. The group used PacBio sequencing to create new genome assemblies of 10 drosophila species, including de novo assemblies of two individual flies using as little as 26 ng of gDNA.

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Friday, February 5, 2021

Webinar: Small Bodies, Big Genomes: Overcoming Large DNA Input Requirements for Long-Read Genome Assembly

In this webinar we present the low DNA input workflow, from DNA requirements through library preparation and sequencing, for generation of high-quality genome assemblies of small-bodied organisms. In addition, we highlight the use of this workflow on the North American ice worm (Mesenchytraeus solifugus), which has a genome size of ~1.6 Gb and lives its entire life cycle in glacier ice, creating a unique opportunity to look at adaptation to harsh environments.

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Friday, February 5, 2021

PAG Conference: PacBio update on products and HiFi applications

In this talk at PAG 2020, PacBio Plant and Animal Sciences Marketing Manager Michelle Vierra discusses recent updates to Single Molecule, Real-Time (SMRT) Sequencing technology, including the Sequel II System, updated protocols for low-input as well as other upcoming developments.

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Friday, February 5, 2021

AGBT Presentation: Feed the World – Developing genomic resources for insects as food

In a push to develop insect-based food sources for people, Brenda Oppert from the USDA has been sequencing bug genomes with PacBio technology. Long reads are essential because of the highly repetitive sequences and large genomes. On the Sequel II System, a single SMRT Cell is sufficient to generate 350-fold coverage and produce a high-quality assembly for some of the insects she’s studying.

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Friday, February 5, 2021

PAG Conference: Endless forms: Genomes from the Darwin Tree of Life Project

Mark Blaxter, project lead of the Sanger Institute’s Darwin Tree of Life, shared an update of the ambitious effort to sequence all 60,000 species believed to be on the British Isles over the next 12 years in this presentation at the PAG 2020 Conference. The Sanger team has already generated data for 94 species, including 44 new moth and butterfly (Lepidoptera) PacBio assemblies, which Blaxter describes in this presentation.

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Friday, February 5, 2021

Webinar: Long HiFi reads for high-quality genome assemblies

In this LabRoots webinar, Jonas Korlach the CSO of PacBio provides an introduction to PacBio HiFi sequence reads, which are both long (up to 25 kb currently) and accurate (>99%) at the individual single-molecule sequence read level andhave allowed for advances in de novo genome assemblies. Korlach reviews the characteristics of HiFi read data obtained with the Sequel II System, followed by examples of high-quality genome assemblies for human, plant and animal genomes including the different aspects of evaluating genome assemblies (contiguity, accuracy, completeness and allelic phasing) and illustrates their high quality by examples of resolving centromeres, telomeres, segmental duplications…

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Friday, February 5, 2021

SMRT Leiden: The impact of polishing on Darwin Tree of Life chromosome-level lepidopteran genome assemblies built with PacBio HiFi and Illumina Hi-C reads

In this SMRT Leiden 2020 Online Virtual Event presentation, Marcela Uliano da Silva of Wellcome Sanger Institute shares her work using CCS data combined with HiC reads to assemble chromosome-level genomes for Lepidoptera. This was done as part of the The Darwin Tree of Life Project which is assembling high-quality genomes for all eukaryotic species in Britain and Ireland. Find data: https://github.com/darwintreeoflife/darwintreeoflife.data

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Friday, November 19, 2021

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