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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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Thursday, August 27, 2020

Application Note: Multiplex target enrichment using barcoded multi-kilobase fragments and probe-based capture technologies

Target enrichment capture methods allow scientists to rapidly interrogate important genomic regions of interest for variant discovery, including SNPs, gene isoforms, and structural variation. Custom targeted sequencing panels are important for characterizing heterogeneous, complex diseases and uncovering the genetic basis of inherited traits with more uniform coverage when compared to PCR-based strategies. With the increasing availability of high-quality reference genomes, customized gene panels are readily designed with high specificity to capture genomic regions of interest, thus enabling scientists to expand their research scope from a single individual to larger cohort studies or population-wide investigations. Coupled with PacBio long-read sequencing, these…

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Thursday, August 27, 2020

Application Note: Targeted sequencing and chromosomal haplotype assembly using Cergentis TLA technology with SMRT Sequencing

The Targeted Locus Amplification (TLA) Technology from Cergentis enables the targeted, hypothesis-neutral, amplification of any genomic locus of interest over 50 kb using just one primer pair complementary to a short locus-specific sequence. TLA is a strategy to selectively amplify complete loci on the basis of crosslinking physically proximal sequences. Unlike other targeted sequencing methods, TLA works without prior detailed locus information, as one primer pair is sufficient to amplify tens to hundreds of kilobases of DNA surrounding that locus. In a separate application of TLA, the unamplified template can be used for genome-wide phasing and assembly. TLA enables targeted…

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Thursday, August 27, 2020

Product Note: SMRTbell express template prep 2.0 for microbial multiplexing

The SMRTbell Express Template Prep Kit 2.0 provides a streamlined, single-tube reaction strategy to generate SMRTbell libraries from 500 bp to >50 kb insert size targets to support large-insert genomic libraries, multiplexed microbial genomes and amplicon sequencing. With this new formulation, we have increased both the yield and efficiency of SMRTbell library preparation for SMRT Sequencing while further minimizing handling-induced DNA damage to retain the integrity of genomic DNA (gDNA). This product note highlights the key benefits, performance, and resources available for obtaining complete microbial genome assemblies with multiplexed sequencing. By using a single-tube, addition-only strategy, the streamlined workflow reduces…

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Thursday, August 27, 2020

Application Note: Microbial multiplexing workflow on the Sequel System

Obtaining microbial genomes with the highest accuracy and contiguity is extremely important when exploring the functional impact of genetic and epigenetic variants on a genome-wide scale. A comprehensive view of the bacterial genome, including genes, regulatory regions, IS elements, phage integration sites, and base modifications is vital to understanding key traits such as antibiotic resistance, virulence, and metabolism. SMRT Sequencing provides complete genomes, often assembled into a single contig. Our streamlined microbial multiplexing procedure for the Sequel System, from library preparation to genome assembly, can be completed with less than 8 hours bench time. Starting with high-quality genomic DNA (gDNA),…

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Tuesday, April 21, 2020

RNA sequencing: the teenage years.

Over the past decade, RNA sequencing (RNA-seq) has become an indispensable tool for transcriptome-wide analysis of differential gene expression and differential splicing of mRNAs. However, as next-generation sequencing technologies have developed, so too has RNA-seq. Now, RNA-seq methods are available for studying many different aspects of RNA biology, including single-cell gene expression, translation (the translatome) and RNA structure (the structurome). Exciting new applications are being explored, such as spatial transcriptomics (spatialomics). Together with new long-read and direct RNA-seq technologies and better computational tools for data analysis, innovations in RNA-seq are contributing to a fuller understanding of RNA biology, from questions…

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Wednesday, February 26, 2020

Immune regions are no longer incomprehensible with SMRT Sequencing

The complex immune regions of the genome, including MHC and KIR, contain large copy number variants (CNVs), a high density of genes, hyper-polymorphic gene alleles, and conserved extended haplotypes (CEH) with enormous linkage disequilibrium (LDs). This level of complexity and inherent biases of short-read sequencing make it challenging for extracting immune region haplotype information from reference-reliant, shotgun sequencing and GWAS methods. As NGS based genome and exome sequencing and SNP arrays have become a routine for population studies, numerous efforts are being made for developing software to extract and or impute the immune gene information from these datasets. Despite these…

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Wednesday, February 26, 2020

Multiplex target enrichment using barcoded multi-kilobase fragments and probe-based capture technologies

Target enrichment capture methods allow scientists to rapidly interrogate important genomic regions of interest for variant discovery, including SNPs, gene isoforms, and structural variation. Custom targeted sequencing panels are important for characterizing heterogeneous, complex diseases and uncovering the genetic basis of inherited traits with more uniform coverage when compared to PCR-based strategies. With the increasing availability of high-quality reference genomes, customized gene panels are readily designed with high specificity to capture genomic regions of interest, thus enabling scientists to expand their research scope from a single individual to larger cohort studies or population-wide investigations. Coupled with PacBio® long-read sequencing, these…

Read More »

Wednesday, February 26, 2020

Target enrichment using a neurology panel for 12 barcoded genomic DNA samples on the PacBio SMRT Sequencing platform

Target enrichment is a powerful tool for studies involved in understanding polymorphic SNPs with phasing, tandem repeats, and structural variations. With increasing availability of reference genomes, researchers can easily design a cost-effective targeted investigation with custom probes specific to regions of interest. Using PacBio long-read technology in conjunction with probe capture, we were able to sequence multi-kilobase enriched regions to fully investigate intronic and exonic regions, distinguish haplotypes, and characterize structural variations. Furthermore, we demonstrate this approach is advantageous for studying complex genomic regions previously inaccessible through other sequencing platforms. In the present work, 12 barcoded genomic DNA (gDNA) samples…

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