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Friday, September 4, 2020

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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Monday, May 4, 2020

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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Monday, March 30, 2020

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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Monday, March 30, 2020

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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Monday, March 30, 2020

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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Wednesday, February 26, 2020

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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Wednesday, February 26, 2020

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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