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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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Tuesday, April 21, 2020

The vaginal microbiome and preterm birth.

The incidence of preterm birth exceeds 10% worldwide. There are significant disparities in the frequency of preterm birth among populations within countries, and women of African ancestry disproportionately bear the burden of risk in the United States. In the present study, we report a community resource that includes ‘omics’ data from approximately 12,000 samples as part of the integrative Human Microbiome Project. Longitudinal analyses of 16S ribosomal RNA, metagenomic, metatranscriptomic and cytokine profiles from 45 preterm and 90 term birth controls identified harbingers of preterm birth in this cohort of women predominantly of African ancestry. Women who delivered preterm exhibited…

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Tuesday, April 21, 2020

A high-quality de novo genome assembly from a single mosquito using PacBio sequencing

A high-quality reference genome is a fundamental resource for functional genetics, comparative genomics, and population genomics, and is increasingly important for conservation biology. PacBio Single Molecule, Real-Time (SMRT) sequencing generates long reads with uniform coverage and high consensus accuracy, making it a powerful technology for de novo genome assembly. Improvements in throughput and concomitant reductions in cost have made PacBio an attractive core technology for many large genome initiatives, however, relatively high DNA input requirements (~5 µg for standard library protocol) have placed PacBio out of reach for many projects on small organisms that have lower DNA content, or on…

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Monday, March 30, 2020

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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Monday, March 30, 2020

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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Wednesday, February 26, 2020

A low DNA input protocol for high-quality PacBio de novo genome assemblies from single invertebrate individuals

A high-quality reference genome is an essential tool for studies of plant and animal genomics. PacBio Single Molecule, Real-Time (SMRT) Sequencing generates long reads with uniform coverage and high consensus accuracy, making it a powerful technology for de novo genome assembly. PacBio is the core technology for many large genome initiatives, however, relatively high DNA input requirements (5 µg for standard library protocol) have placed PacBio out of reach for many projects on small, non-inbred organisms that may have lower DNA content. Here we present high-quality de novo genome assemblies from single invertebrate individuals for two different species: the Anopheles…

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Wednesday, February 26, 2020

A high-quality de novo genome assembly from a single mosquito using PacBio sequencing

A high-quality reference genome is an essential tool for studies of plant and animal genomics. PacBio Single Molecule, Real-Time (SMRT) Sequencing generates long reads with uniform coverage and high consensus accuracy, making it a powerful technology for de novo genome assembly. While PacBio is the core technology for many large genome initiatives, relatively high DNA input requirements (3 µg for standard library protocol) have placed PacBio out of reach for many projects on small, non-inbred organisms that may have lower DNA content. Here we present high-quality de novo genome assemblies from single invertebrate individuals for two different species: the Anopheles…

Read More »

Wednesday, February 26, 2020

A low DNA input protocol for high-quality PacBio de novo genome assemblies

A high-quality reference genome is an essential tool for studying the genetics of traits and disease, organismal, comparative and conservation biology, and population genomics. PacBio Single Molecule, Real-Time (SMRT) Sequencing generates long reads with uniform coverage and high consensus accuracy, making it a powerful technology for de novo genome assembly. Improvements in throughput and concomitant reductions in cost have made PacBio an attractive core technology for many large genome initiatives. However, relatively high DNA input requirements (3 µg for standard library protocol) have placed PacBio out of reach for many projects on small organisms that may have lower DNA content…

Read More »

Wednesday, February 26, 2020

New advances in SMRT Sequencing facilitate multiplexing for de novo and structural variant studies

The latest advancements in Sequel II SMRT Sequencing have increased average read lengths up to 50% compared to Sequel II chemistry 1.0 which allows multiplexing of 2-3 small organisms (98% of conserved genes) for both individuals. For microbial multiplexing, we multiplexed 48 microbes with varying complexities and sizes ranging 1.6-8.0 Mb in single SMRT Cell 8M. Using a new end-to-end analysis (Microbial Assembly Analysis, SMRT Link 8.0), assemblies resulted in complete circularized genomes (>200-fold coverage) and efficient detection of >3-200 kb plasmids. Finally, the long read lengths (>90 kb) allows detection of barcodes in large insert SMRTbell templates (>15 kb)…

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