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Friday, February 26, 2021

Single cell isoform sequencing (scIso-Seq) identifies novel full-length mRNAs and cell type-specific expression

Single cell RNA-seq (scRNA-seq) is an emerging field for characterizing cell heterogeneity in complex tissues. However, most scRNA-seq methodologies are limited to gene count information due to short read lengths. Here, we combine the microfluidics scRNA-seq technique, Drop-Seq, with PacBio Single Molecule, Real-Time (SMRT) Sequencing to generate full-length transcript isoforms that can be confidently assigned to individual cells. We generated single cell Iso-Seq (scIso-Seq) libraries for chimp and human cerebral organoid samples on the Dolomite Nadia platform and sequenced each library with two SMRT Cells 8M on the PacBio Sequel II System. We developed a bioinformatics pipeline to identify, classify,…

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Friday, February 26, 2021

A complete solution for full-length transcript sequencing using the PacBio Sequel II System

Long read mRNA sequencing methods such as PacBio’s Iso-Seq method offers high-throughput transcriptome profiling in prokaryotic and eukaryotic cells. By avoiding the transcript assembly problem and instead sequencing full-length cDNA, Iso-Seq has emerged as the most reliable technology for annotating isoforms and, in turn, improving proteome predictions in a wide variety of organisms. Improvements in library preparation, sequencing throughput, and bioinformatics has enabled the Iso-Seq method to be complete solution for transcript characterization. The Iso-Seq Express kit is a one-day library prep requiring 60-300 ng of total RNA. The PacBio Sequel II system produces 4-5 million full-length reads, sufficient to…

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Saturday, February 20, 2021

Informational Guide: What’s the value of sequencing full-length RNA transcripts?

The study of genomics has revolutionized our understanding of science, but the field of transcriptomics grew with the need to explore the functional impacts of genetic variation. While different tissues in an organism may share the same genomic DNA, they can differ greatly in what regions are transcribed into RNA and in their patterns of RNA processing. By reviewing the history of transcriptomics, we can see the advantages of RNA sequencing using a full-length transcript approach become clearer.

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Saturday, February 20, 2021

Application Brief: Single-cell RNA sequencing with HiFi reads – Best Practices

With PacBio single-cell RNA sequencing using the Iso-Seq method, you can now distinguish between alternative transcript isoforms at the single-cell level. The highly accurate long reads (HiFi reads) can span the entire 5′ to 3′ end of a transcript, allowing a high-resolution view of isoform diversity and revealing cell-to-cell heterogeneity without the need for assembly.

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Friday, February 5, 2021

AGBT Presentation: Single cell isoform sequencing (scIso-Seq) identifies novel full-length mRNAs and cell type-specific expression

In this AGBT presentation from AGBT 2019, Jason Underwood, shares information about single-cell isoform sequencing (scIso-Seq), focusing on a collaborative project with the labs of Evan Eichler and Alex Pollen. For this effort, scientists used Drop-seq sample prep and then loaded cDNA products onto the Sequel System. Results from a barnyard experiment using mouse and human cells as well as from cerebral organoids demonstrated that this approach could deliver cell type-specific gene expression data. Underwood also presents data from the Sequel II System comparing chimp and human organoids, resulting in information about 14,000 unique genes with important insights for post-transcriptional…

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Friday, February 5, 2021

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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Friday, February 5, 2021

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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Friday, February 5, 2021

Virtual Global Summit: HIT-scISOseq – High-throughput and high-accuracy single-cell full-length isoform sequencing

In this PacBio Virtual Global Summit 2020 presentation, Tang Chong of BGI shares work on how single-cell isoform sequencing can reveal transcriptomic dynamics in individual cells invisible to bulk- and single-cell RNA analysis based on short-read sequencing. However, current long-read single-cell sequencing technologies have been limited by low throughput and high error rate. Chong introduces HIT-scISOseq for high-throughput single-cell isoform sequencing. This method was made possible by full-length cDNA capture using biotinylated PCR primers, and by a novel library preparation procedure that combines head-to-tail concatemeric full-length cDNAs into a long SMRTbell insert for high-accuracy PacBio Sequencing. HIT-scISOseq represents a high-throughput,…

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