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Thursday, August 19, 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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Thursday, August 19, 2021

Infographic: SMRT Sequencing – How it works

PacBio Systems are powered by Single Molecule, Real-Time (SMRT) Sequencing, a technology proven to produce exceptionally long reads with high accuracy. SMRT Sequencing allows you to accelerate your science with the complete range of PacBio applications to produce data you can trust.

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Thursday, August 19, 2021

Case Study: Pioneering a pan-genome reference collection

At DuPont Pioneer, DNA sequencing is paramount for R&D to reveal the genetic basis for traits of interest in commercial crops such as maize, soybean, sorghum, sunflower, alfalfa, canola, wheat, rice, and others. They cannot afford to wait the years it has historically taken for high-quality reference genomes to be produced. Nor can they rely on a single reference to represent the genetic diversity in its germplasm.

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Tuesday, June 1, 2021

Draft genome of horseweed illuminates expansion of gene families that might endow herbicide resistance.

Conyza canadensis (horseweed), a member of the Compositae (Asteraceae) family, was the first broadleaf weed to evolve resistance to glyphosate. Horseweed, one of the most problematic weeds in the world, is a true diploid (2n=2X=18) with the smallest genome of any known agricultural weed (335 Mb). Thus, it is an appropriate candidate to help us understand the genetic and genomic basis of weediness. We undertook a draft de novo genome assembly of horseweed by combining data from multiple sequencing platforms (454 GS-FLX, Illumina HiSeq 2000 and PacBio RS) using various libraries with different insertion sizes (~350 bp, ~600 bp, ~3…

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Tuesday, June 1, 2021

A comprehensive lincRNA analysis: From conifers to trees

We have produced an updated annotation of the Norway spruce genome on the basis of an in siliconormalised set of RNA-Seq data obtained from 1,529 samples and comprising 15.5 billion paired-end Illumina HiSeq reads complemented by 18Mbp of PacBio cDNA data (3.2M sequences). In addition to augmenting and refining the previous protein coding gene annotation, here we focus on the addition of long intergenic non-coding RNA (lincRNA) and micro RNA (miRNA) genes. In addition to non-coding loci, our analyses also identified protein coding genes that had been missed by the initial genome annotation and enabled us to update the annotation…

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Tuesday, June 1, 2021

Long read sequencing technology to solve complex genomic regions assembly in plants

Numerous whole genome sequencing projects already achieved or ongoing have highlighted the fact that obtaining a high quality genome sequence is necessary to address comparative genomics questions such as structural variations among genotypes and gain or loss of specific function. Despite the spectacular progress that has been done regarding sequencing technologies, accurate and reliable data are still challenging, at the whole genome scale but also when targeting specific genomic regions. These issues are even more noticeable for complex plant genomes. Most plant genomes are known to be particularly challenging due to their size, high density of repetitive elements and various…

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Tuesday, June 1, 2021

Single molecule high-fidelity (HiFi) Sequencing with >10 kb libraries

Recent improvements in sequencing chemistry and instrument performance combine to create a new PacBio data type, Single Molecule High-Fidelity reads (HiFi reads). Increased read length and improvement in library construction enables average read lengths of 10-20 kb with average sequence identity greater than 99% from raw single molecule reads. The resulting reads have the accuracy comparable to short read NGS but with 50-100 times longer read length. Here we benchmark the performance of this data type by sequencing and genotyping the Genome in a Bottle (GIAB) HG0002 human reference sample from the National Institute of Standards and Technology (NIST). We…

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Tuesday, June 1, 2021

Structural variant detection in crops using low-fold coverage long-read sequencing

Genomics studies have shown that the insertions, deletions, duplications, translocations, inversions, and tandem repeat expansions in the structural variant (SV) size range (>50 bp) contribute to the evolution of traits and often have significant associations with agronomically important phenotypes. However, most SVs are too small to detect with array comparative genomic hybridization and too large to reliably discover with short-read DNA sequencing. While de novo assembly is the most comprehensive way to identify variants in a genome, recent studies in human genomes show that PacBio SMRT Sequencing sensitively detects structural variants at low coverage. Here we present SV characterization in…

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Tuesday, June 1, 2021

A high-quality PacBio insect genome from 5 ng of input DNA

High-quality insect genomes are essential resources to understand insect biology and to combat them as disease vectors and agricultural pests. It is desirable to sequence a single individual for a reference genome to avoid complications from multiple alleles during de novo assembly. However, the small body size of many insects poses a challenge for the use of long-read sequencing technologies which often have high DNA-input requirements. The previously described PacBio Low DNA Input Protocol starts with ~100 ng of DNA and allows for high-quality assemblies of single mosquitoes among others and represents a significant step in reducing such requirements. Here,…

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Tuesday, June 1, 2021

Metagenomic analysis of type II diabetes gut microbiota using PacBio HiFi reads reveals taxonomic and functional differences

In the past decade, the human microbiome has been increasingly shown to play a major role in health. For example, imbalances in gut microbiota appear to be associated with Type II diabetes mellitus (T2DM) and cardiovascular disease. Coronary artery disease (CAD) is a major determinant of the long-term prognosis among T2DM patients, with a 2- to 4-fold increased mortality risk when present. However, the exact microbial strains or functions implicated in disease need further investigation. From a large study with 523 participants (185 healthy controls, 186 T2DM patients without CAD, and 106 T2DM patients with CAD), 3 samples from each…

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Friday, February 5, 2021

User Group Meeting: Application of genome assembly in Bovinae species

In this PacBio User Group Meeting presentation, Tim Smith of the USDA’s Agricultural Research Service describes efforts to generate reference-grade genome assemblies for various bovine species and analyze them to understand factors such as how selective breeding has affected certain breeds. Genome assemblies he presents span cattle, water buffalo, and gaur. Smith shows data for each assembly, noting that as data production shifted to the Sequel System, long-read PacBio data became even better at producing highly contiguous assemblies.

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Friday, February 5, 2021

Webinar: Unbiased, efficient characterization of metagenome functions with PacBio HiFi sequencing

Understanding interactions among plants and the complex communities of organisms living on, in and around them requires more than one experimental approach. A new method for de novo metagenome assembly, PacBio HiFi sequencing, has unique strengths for determining the functional capacity of metagenomes. With HiFi sequencing, the accuracy and median read length of unassembled data outperforms the quality metrics for many existing assemblies generated with other technologies, enabling cost-competitive recovery of full-length genes and operons even from rare species. When paired with the ability to close the genomes of even challenging isolates like Xanthomonas, the PacBio Sequel II System is…

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Friday, February 5, 2021

AGBT Presentation: Feed the World – Developing genomic resources for insects as food

In a push to develop insect-based food sources for people, Brenda Oppert from the USDA has been sequencing bug genomes with PacBio technology. Long reads are essential because of the highly repetitive sequences and large genomes. On the Sequel II System, a single SMRT Cell is sufficient to generate 350-fold coverage and produce a high-quality assembly for some of the insects she’s studying.

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Friday, February 5, 2021

Video: Introduction to PacBio highly accurate long-read sequencing

PacBio Sequencing is powered by Single Molecule, Real-Time (SMRT) Sequencing technology. The Sequel II System offers the affordable, highly accurate long reads needed to gain comprehensive views of genomes, transcriptomes, and epigenomes. Watch this video to get to know the Sequel II System, explore the key advantages of SMRT Sequencing, and learn how its applications can be used to drive new discoveries.

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