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Thursday, August 27, 2020

Case Study: Assembling high-quality human genomes – Beyond the ‘$1,000 genome’

Scientists from WashU, Macrogen, and Mount Sinai are using long-read sequencing with single-molecule, next-generation genome mapping to create gold-quality de novo assemblies of human genomes. Unbiased de novo assembled genomes also highlight the substantial amount of structural variation unique to individuals and populations, which cannot be accessed by short-read technologies that use a reference-based re-sequencing approach.

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Thursday, August 27, 2020

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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Thursday, August 27, 2020

SMRT Analysis Brochure: Gain a deeper understanding of your sequencing data

The PacBio Platform includes an extensive software portfolio that employs key advantages of SMRT (Single Molecule, Real-Time) Sequencing technology: extraordinarily long reads, highest consensus accuracy, uniform coverage and simultaneous epigenetic characterization. Core elements of our analytical portfolio include SMRT Analysis software, DevNet and SMRT Compatible products.

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Tuesday, April 21, 2020

The genome of cultivated peanut provides insight into legume karyotypes, polyploid evolution and crop domestication.

High oil and protein content make tetraploid peanut a leading oil and food legume. Here we report a high-quality peanut genome sequence, comprising 2.54?Gb with 20 pseudomolecules and 83,709 protein-coding gene models. We characterize gene functional groups implicated in seed size evolution, seed oil content, disease resistance and symbiotic nitrogen fixation. The peanut B subgenome has more genes and general expression dominance, temporally associated with long-terminal-repeat expansion in the A subgenome that also raises questions about the A-genome progenitor. The polyploid genome provided insights into the evolution of Arachis hypogaea and other legume chromosomes. Resequencing of 52 accessions suggests that…

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Tuesday, April 21, 2020

Platanus-allee is a de novo haplotype assembler enabling a comprehensive access to divergent heterozygous regions.

The ultimate goal for diploid genome determination is to completely decode homologous chromosomes independently, and several phasing programs from consensus sequences have been developed. These methods work well for lowly heterozygous genomes, but the manifold species have high heterozygosity. Additionally, there are highly divergent regions (HDRs), where the haplotype sequences differ considerably. Because HDRs are likely to direct various interesting biological phenomena, many genomic analysis targets fall within these regions. However, they cannot be accessed by existing phasing methods, and we have to adopt costly traditional methods. Here, we develop a de novo haplotype assembler, Platanus-allee ( http://platanus.bio.titech.ac.jp/platanus2 ), which…

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Tuesday, April 21, 2020

Urotensin-related gene transcripts mark developmental emergence of the male forebrain vocal control system in songbirds.

Songbirds communicate through learned vocalizations, using a forebrain circuit with convergent similarity to vocal-control circuitry in humans. This circuit is incomplete in female zebra finches, hence only males sing. We show that the UTS2B gene, encoding Urotensin-Related Peptide (URP), is uniquely expressed in a key pre-motor vocal nucleus (HVC), and specifically marks the neurons that form a male-specific projection that encodes timing features of learned song. UTS2B-expressing cells appear early in males, prior to projection formation, but are not observed in the female nucleus. We find no expression evidence for canonical receptors within the vocal circuit, suggesting either signalling to…

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Monday, March 30, 2020

ASHG PacBio Workshop: Going beyond the $1,000 genome? – the future of high quality de novo human genomes, epigenomes and transcriptomes?

Jonas Korlach, Chief Scientific Officer at PacBio, discussed the technology waves that have followed the initial human genome sequencing project, where we are today, and where we are going. Today, we are in what Korlach calls the 4th wave, where more comprehensive whole-genome re-sequencing is occurring, and we are nearing the 5th, when we will actually be able to free ourselves from reference genomes and sequence everything de novo.

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Monday, March 30, 2020

ASHG Conference: Comprehensive genome and transcriptome structural analysis of a breast cancer cell line using PacBio long read sequencing

During this presentation from ASHG 2015, Maria Nattestad of Cold Spring Harbor Laboratory described the study of a Her2-amplified breast cancer cell line using long-read sequencing from PacBio. With reads as long as 71 kb, she was able to characterize extensive and complex rearrangements and found more than 11,000 structural variants. She also used the Iso-Seq method to find gene fusions, including some novel ones.

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Monday, March 30, 2020

ASHG Virtual Poster: De novo assembly of a diploid Asian genome

Yunfei Guo, from the University of Southern California, presents his ASHG 2015 poster on a de novo assembly of a diploid Asian genome. The uniform coverage of long-read sequencing helped access regions previously unresolvable due to high GC bias or long repeats. The assembly allowed scientists to fill some 400 gaps in the latest human reference genome, including some as long as 50 kb.

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Monday, March 30, 2020

Customer Experience: Benefits of long reads

Yunfei Guo, a grad student at the University of Southern California, discusses the benefits of SMRT Sequencing: very long reads that make it possible to resolve long repetitive regions and discover structural variants, and a random error mode that allows for extremely high accuracy.

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Monday, March 30, 2020

AGBT PacBio Workshop: The human genome – from one to one million

In his talk from the AGBT 2015 PacBio workshop, Craig Venter detailed plans to sequence 1 million genomes and gather extensive phenotypic data to make sense of them. Included: generating 30 reference genomes to represent ethnogeographic diversity; the need for long-range continuity in sequencing; and truly predictive genomics.

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Monday, March 30, 2020

AGBT Virtual Poster: Observing heterozygotic DNA methylation patterns in diploid genomes using kinetics data from the PacBio RS

Yuta Suzuki from the University of Tokyo presents his AGBT poster on heterozygotic DNA methylation patterns. He used kinetic data from SMRT Sequencing to generate epigenetic information on samples ranging from human to medaka fish and was able to analyze haplotype-specific methylation data. He also shows that long reads are better able to capture data about CpG islands than short-read sequences.

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