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Tuesday, October 27, 2020

ASHG PacBio Workshop: Latest product and application updates

In this ASHG 2020 PacBio Workshop Jonas Korlach, CSO, shares how the new PacBio Sequel IIe System makes highly accurate long-read sequencing easy and affordable so?all scientists can gain comprehensive views of human genomes and transcriptomes. He goes on to provide updates on the applications including human WGS for variant detection, de novo genome assembly, single-cell full-length RNA sequencing, and targeted sequencing using PCR and No-Amp methods.

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Tuesday, October 27, 2020

ASHG CoLab: PacBio HiFi reads for comprehensive characterization of genomes and single-cell isoform expression

In this ASHG 2020 CoLab presentation hear Principal Scientists, Aaron Wenger and Elizabeth Tseng share how highly accurate long reads (HiFi reads) provide comprehensive variant detection for both genomes and transcriptomes. Aaron Wenger describes how new improvements in protocols and analysis methods have increased scalability and accuracy of variant calling. As demonstrated in the precisionFDA Truth Challenge V2, HiFi reads (>99% accurate, 15 kb – 20 kb) now outperform short reads for single nucleotide and structural variant calling and match for small indels. This includes calling >30,000 small variants and >10,000 structural variants missed by short reads, many in medically…

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Sunday, October 25, 2020

Video Poster: High-throughput HiFi library workflow for human whole genome sequencing on the Sequel II System

Recent advances in sequencing chemistry and software in the Sequel II System enable generating highly accurate long reads that are up to 25 kb in length with >99% accuracy. The high quality HiFi reads are suitable for variant detection of all types, from single nucleotides to structural variants. PacBio offers an end-to-end solution from sample preparation to data analysis. However, library construction is still a bottleneck making it difficult to implement into a high-throughput workflow for sequencing large number of samples. Input DNA requirements, DNA shearing and size-selection/fractionation are the most critical and challenging steps in the current procedure. In…

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Sunday, October 25, 2020

Video Poster: A new approach to Thalassemia and Ataxia carrier screening panels using CRISPR-Cas9 enrichment and long-read sequencing

Although PCR is a cost-effective way to enrich for genomic regions of interest for DNA sequencing, amplifying regions with extreme GC-content and long stretches of short tandem repeat (STR) sequences is often problematic and prone to sequence artifacts. This is especially true when developing multiplexed PCR assays for clinical applications such as carrier screening for multiple genes. The additional challenge is that all PCR primer pairs must be carefully selected to be compatible based on amplicon size and PCR conditions. Due to these experimental design constraints, a single tube with a high number of multiplexed PCR amplicons is difficult to…

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Sunday, October 25, 2020

Video Poster: Accurate, comprehensive variant calling in difficult-to-map genes using HiFi reads

Introduction: Around 5% (1,168) of protein-coding genes in the human genome contain an exon that is difficult to map with typical next-generation sequencing (NGS) read lengths due to homologous pseudogenes or segmental duplications. Among the difficult-to-map genes are 193 with known medical relevance, including CYP2D6, GBA, SMN1/2, and VWF. Long-read DNA sequencing provides increased mappability, accessing many of the difficult-to-map regions by connecting the homologous exon to neighboring unique sequence. Until recently, the read-level accuracy of long-read sequencing had made it challenging to accurately call small variants. The recently developed HiFi reads from the PacBio Sequel II System provide both…

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Sunday, October 25, 2020

Video Poster: Capture long-read isoform sequencing (Iso-Seq) for uncovering human isoform diversity in the brain and characterizing SARS-CoV2 viral RNAs

Most genes in eukaryotic organisms produce alternative isoforms, broadening the diversity of proteins and non-coding RNAs encoded by the genome. In contrast to other RNA sequencing platforms that rely on short-read sequencing, long accurate reads from PacBio Single Molecule, Real-Time (SMRT) Sequencing can characterize full-length transcripts without the need for assembly and inference. The PacBio isoform sequencing (Iso-Seq) method generates full-length sequences for transcripts up to 10 kb in length, with scalable throughput using barcoding approaches. The Iso-Seq application can be employed for a wide variety of studies, including improvement of gene annotation, identification of novel isoforms and fusion transcripts,…

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Sunday, October 25, 2020

Video Poster: Long-read sequencing of the SARS-CoV-2 genome and the human immune repertoire

COVID-19 is caused by the infection of SARS-CoV-2, a member of the coronavirus family. Complete and accurate sequencing of the SARS-CoV-2 genome enables discovery and epidemiological tracing of mutations that may be important for antiviral and vaccine research. A complementary approach, sequencing the patients’ immune repertoire, allows for detection of neutralizing antibodies and understanding variation in the adaptive immune response. PacBio’s SMRT Sequencing uses circular consensus sequencing that can generate long, highly accurate (HiFi) reads. We find that a tiled multiplex PCR amplicon approach of ~1-2 kb fragments achieves a balanced tradeoff between ease of library preparation and robustness to…

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Sunday, October 25, 2020

AGBT Virtual Poster: SMRT Sequencing of whole mitochondrial genomes to study metabolic disease

Penelope Bonnen, an assistant professor at Baylor College of Medicine, discusses her use of PacBio SMRT sequencing to look at whole mitochondrial genomes as she reviews her AGBT 2012 poster. Dr. Bonnen is studying a Micronesian population with unusually high rates of obesity, diabetes, and cardiovascular disease to figure out how mitochondrial genetics contributes to adult-onset metabolic syndrome. She describes two approaches in a pilot project for full-length mitochondrial sequencing: one using a 500-base pair insert library and another directly sequencing the single 17 kb amplicon.

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Sunday, October 25, 2020

Stanford Symposium: Dynamic chromosome methylation controls cell cycle progression

Stanford University developmental biologist Lucy Shapiro discusses a collaborative research effort with PacBio sequencing that revealed previously unknown aspects of how chromosome methylation regulates cell cycle progression in Caulobacter. The ability to detect DNA modifications through SMRT Sequencing proved critical in determining methylation states throughout the cell cycle.

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Sunday, October 25, 2020

Customer Experience: Exploring the genetics of fragile X syndrome using DNA sequencing technology

Paul Hagerman, MD/PhD, a professor in the biochemistry and molecular medicine department at UC Davis discusses the use of PacBio SMRT sequencing technology for the fragile X gene. Hagerman says the PacBio RS is able to sequence through more than a kilobase of the CGG trinucleotide repeat element underlying Fragile X Syndrome — something no other sequencing platform has achieved. He also plans to use the data to study methylation of this gene, which tends to occur in cases where there are more than 200 copies of the CGG element.

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