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Friday, June 18, 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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Friday, June 18, 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, June 18, 2021

Application Brief: Long-read RNA sequencing – Best Practices

With Single Molecule, Real-Time (SMRT) Sequencing and the Sequel Systems, you can easily and affordably sequence complete transcript isoforms in genes of interest or across the entire transcriptome. The Iso-Seq method allows users to generate full-length cDNA sequences up to 10 kb in length — with no assembly required — to confidently characterize full-length transcript isoforms.

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Tuesday, June 1, 2021

Isoform sequencing: Unveiling the complex landscape of the eukaryotic transcriptome on the PacBio RS II.

Alternative splicing of RNA is an important mechanism that increases protein diversity and is pervasive in the most complex biological functions. While advances in RNA sequencing methods have accelerated our understanding of the transcriptome, isoform discovery remains computationally challenging due to short read lengths. Here, we describe the Isoform Sequencing (Iso-Seq) method using long reads generated by the PacBio RS II. We sequenced rat heart and lung RNA using the Clontech® SMARTer® cDNA preparation kit followed by size selection using agarose gel. Additionally, we tested the BluePippin™ device from Sage Science for efficiently extracting longer transcripts = 3 kb. Post-sequencing,…

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Tuesday, June 1, 2021

A novel analytical pipeline for de novo haplotype phasing and amplicon analysis using SMRT Sequencing technology.

While the identification of individual SNPs has been readily available for some time, the ability to accurately phase SNPs and structural variation across a haplotype has been a challenge. With individual reads of an average length of 9 kb (P5-C3), and individual reads beyond 30 kb in length, SMRT Sequencing technology allows the identification of mutation combinations such as microdeletions, insertions, and substitutions without any predetermined reference sequence. Long- amplicon analysis is a novel protocol that identifies and reports the abundance of differing clusters of sequencing reads within a single library. Graphs generated via hierarchical clustering of individual sequencing reads…

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Tuesday, June 1, 2021

SMRT Sequencing solutions for large genomes and transcriptomes.

Single Molecule, Real-Time (SMRT) Sequencing holds promise for addressing new frontiers in large genome complexities, such as long, highly repetitive, low-complexity regions and duplication events, and differentiating between transcript isoforms that are difficult to resolve with short-read technologies. We present solutions available for both reference genome improvement (>100 MB) and transcriptome research to best leverage long reads that have exceeded 20 Kb in length. Benefits for these applications are further realized with consistent use of size-selection of input sample using the BluePippin™ device from Sage Science. Highlights from our genome assembly projects using the latest P5-C3 chemistry on model organisms…

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Tuesday, June 1, 2021

Isoform sequencing: Unveiling the complex landscape in eukaryotic transcriptome on the PacBio RS II.

Advances in RNA sequencing have accelerated our understanding of the transcriptome, however isoform discovery remains challenging due to short read lengths. The Iso-Seq Application provides a new alternative to sequence full-length cDNA libraries using long reads from the PacBio RS II. Identification of long and often rare isoforms is demonstrated with rat heart and lung RNA prepared using the Clontech® SMARTer® cDNA preparation kit, followed by agarose-gel size selection in fractions of 1-2 kb, 2-3 kb and 3-6 kb. For each tissue, 1.8 and 1.2 million reads were obtained from 32 and 26 SMRT Cells, respectively. Filtering for reads with…

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Tuesday, June 1, 2021

Complex alternative splicing patterns in hematopoietic cell subpopulations revealed by third-generation long reads.

Background: Alternative splicing expands the repertoire of gene functions and is a signature for different cell populations. Here we characterize the transcriptome of human bone marrow subpopulations including progenitor cells to understand their contribution to homeostasis and pathological conditions such as atherosclerosis and tumor metastasis. To obtain full-length transcript structures, we utilized long reads in addition to RNA-seq for estimating isoform diversity and abundance. Method: Freshly harvested, viable human bone marrow tissues were extracted from discarded harvesting equipment and separated into total bone marrow (total), lineage-negative (lin-) progenitor cells and differentiated cells (lin+) by magnetic bead sorting with antibodies to…

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