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Tuesday, July 27, 2021

Purchasing Guide: Application consumable bundles

With this PacBio Application Consumable Bundles Purchasing Guide, you can easily order the required consumables for the Sequel II System. Simply choose your SMRT Sequencing Application and with the single part number place your order to get started.

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Tuesday, July 27, 2021

Case Study: Diving Deep – Revealing the mysteries of marine life with SMRT Sequencing

Many scientists are using PacBio Single Molecule, Real-Time (SMRT) Sequencing to explore the genomes and transcriptomes of a wide variety of marine species and ecosystems. These studies are already adding to our understanding of how marine species adapt and evolve, contributing to conservation efforts, and informing how we can optimize food production through efficient aquaculture.

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Tuesday, June 1, 2021

New discoveries from closing Salmonella genomes using Pacific Biosciences continuous long reads.

The newer hierarchical genome assembly process (HGAP) performs de novo assembly using data from a single PacBio long insert library. To assess the benefits of this method, DNA from several Salmonella enterica serovars was isolated from a pure culture. Genome sequencing was performed using Pacific Biosciences RS sequencing technology. The HGAP process enabled us to close sixteen Salmonella subsp. enterica genomes and their associated mobile elements: The ten serotypes include: Salmonella enterica subsp. enterica serovar Enteritidis (S. Enteritidis) S. Bareilly, S. Heidelberg, S. Cubana, S. Javiana and S. Typhimurium, S. Newport, S. Montevideo, S. Agona, and S. Tennessee. In addition,…

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Tuesday, June 1, 2021

Accurately surveying uncultured microbial species with SMRT Sequencing

Background: Microbial ecology is reshaping our understanding of the natural world by revealing the large phylogenetic and functional diversity of microbial life. However the vast majority of these microorganisms remain poorly understood, as most cultivated representatives belong to just four phylogenetic groups and more than half of all identified phyla remain uncultivated. Characterization of this microbial ‘dark matter’ will thus greatly benefit from new metagenomic methods for in situ analysis. For example, sensitive high throughput methods for the characterization of community composition and structure from the sequencing of conserved marker genes. Methods: Here we utilize Single Molecule Real-Time (SMRT) sequencing…

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Tuesday, June 1, 2021

Old school/new school genome sequencing: One step backward — a quantum leap forward.

As the costs for genome sequencing have decreased the number of “genome” sequences have increased at a rapid pace. Unfortunately, the quality and completeness of these so–called “genome” sequences have suffered enormously. We prefer to call such genome assemblies as “gene assembly space” (GAS). We believe it is important to distinguish GAS assemblies from reference genome assemblies (RGAs) as all subsequent research that depends on accurate genome assemblies can be highly compromised if the only assembly available is a GAS assembly.

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Tuesday, June 1, 2021

Low-input long-read sequencing for complete microbial genomes and metagenomic community analysis.

Microbial genome sequencing can be done quickly, easily, and efficiently with the PacBio sequencing instruments, resulting in complete de novo assemblies. Alternative protocols have been developed to reduce the amount of purified DNA required for SMRT Sequencing, to broaden applicability to lower-abundance samples. If 50-100 ng of microbial DNA is available, a 10-20 kb SMRTbell library can be made. A 2 kb SMRTbell library only requires a few ng of gDNA when carrier DNA is added to the library. The resulting libraries can be loaded onto multiple SMRT Cells, yielding more than enough data for complete assembly of microbial genomes…

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Tuesday, June 1, 2021

Profiling metagenomic communities using circular consensus and Single Molecule, Real-Time Sequencing.

There are many sequencing-based approaches to understanding complex metagenomic communities spanning targeted amplification to whole-sample shotgun sequencing. While targeted approaches provide valuable data at low sequencing depth, they are limited by primer design and PCR amplification. Whole-sample shotgun experiments generally use short-read, second-generation sequencing, which results in data processing difficulties. For example, reads less than 1 kb in length will likely not cover a complete gene or region of interest, and will require assembly. This not only introduces the possibility of incorrectly combining sequence from different community members, it requires a high depth of coverage. As such, rare community members…

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Tuesday, June 1, 2021

Highly sensitive and cost-effective detection of BRCA1 and BRCA2 cancer variants in FFPE samples using Multiplicom’s MASTR technology & Single Molecule, Real-Time (SMRT) Sequencing

Specific mutations in BRCA1 and BRCA2 have been shown to be associated with several types of cancers. Molecular profiling of cancer samples requires assays capable of accurately detecting the entire spectrum of variants, including those at relatively low frequency. Next-Generation Sequencing (NGS) has been a powerful tool for researchers to better understand cancer genetics. Here we describe a targeted re-sequencing workflow that combines barcoded amplification of BRCA1 and BRCA2 exons from 12 FFPE tumor samples using Multiplicom’s MASTR technology with PacBio SMRT Sequencing. This combination allows for the accurate detection of variants in a cost-effective and timely manner.

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Tuesday, June 1, 2021

Profiling metagenomic communities using circular consensus and Single Molecule, Real-Time Sequencing

There are many sequencing-based approaches to understanding complex metagenomic communities, spanning targeted amplification to whole-sample shotgun sequencing. While targeted approaches provide valuable data at low sequencing depth, they are limited by primer design and PCR amplification. Whole-sample shotgun experiments require a high depth of coverage. As such, rare community members may not be represented in the resulting assembly. Circular-consensus, Single Molecule, Real-Time (SMRT) Sequencing reads in the 1-2 kb range, with >99% consensus accuracy, can be efficiently generated for low amounts of input DNA, e.g. as little as 10 ng of input DNA sequenced in 4 SMRT Cells can generate…

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Tuesday, June 1, 2021

Profiling the microbiome in fecal microbiota transplantation using circular consensus and Single Molecule, Real-Time Sequencing

There are many sequencing-based approaches to understanding complex metagenomic communities spanning targeted amplification to whole-sample shotgun sequencing. While targeted approaches provide valuable data at low sequencing depth, they are limited by primer design and PCR. Whole-sample shotgun experiments generally use short-read sequencing, which results in data processing difficulties. For example, reads less than 500bp in length will rarely cover a complete gene or region of interest, and will require assembly. This not only introduces the possibility of incorrectly combining sequence from different community members, it requires a high depth of coverage. As such, rare community members may not be represented…

Read More »

Tuesday, June 1, 2021

Low-input long-read sequencing for complete microbial genomes and metagenomic community analysis

Microbial genome sequencing can be done quickly, easily, and efficiently with the PacBio sequencing instruments, resulting in complete de novo assemblies. Alternative protocols have been developed to reduce the amount of purified DNA required for SMRT Sequencing, to broaden applicability to lower-abundance samples. If 50-100 ng of microbial DNA is available, a 10-20 kb SMRTbell library can be made. The resulting library can be loaded onto multiple SMRT Cells, yielding more than enough data for complete assembly of microbial genomes using the SMRT Portal assembly program HGAP, plus base modification analysis. The entire process can be done in less than…

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