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Tuesday, June 1, 2021

Assessing diversity and clonal variation of Australia’s grapevine germplasm: Curating the FALCON-Unzip Chardonnay de novo genome assembly

Until recently only two genome assemblies were publicly available for grapevine—both Vitis vinifera L. Cv. Pinot Noir (PN). The best available PN genome assembly (Jaillon et al. 2007) is not representative of the genome complexity that is typical of wine-grape cultivars in the field and it is highly fragmented. To assess the genetic complexities of Chardonnay grapevine, assembly of a new de novo reference genome was needed. Here we describe a draft assembly using PacBio SMRT Sequencing data and PacBio’s new phased diploid genome assembler FALCON-Unzip (Chin et al. 2016).

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Tuesday, June 1, 2021

Phased diploid genome assembly with single-molecule real-time sequencing

While genome assembly projects have been successful in many haploid and inbred species, the assembly of non-inbred or rearranged heterozygous genomes remains a major challenge. To address this challenge, we introduce the open-source FALCON and FALCON-Unzip algorithms (https://github.com/PacificBiosciences/FALCON/) to assemble long-read sequencing data into highly accurate, contiguous, and correctly phased diploid genomes. We generate new reference sequences for heterozygous samples including an F1 hybrid of Arabidopsis thaliana, the widely cultivated Vitis vinifera cv. Cabernet Sauvignon, and the coral fungus Clavicorona pyxidata, samples that have challenged short-read assembly approaches. The FALCON-based assemblies are substantially more contiguous and complete than alternate short-…

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Tuesday, June 1, 2021

Best practices for diploid assembly of complex genomes using PacBio: A case study of Cascade Hops

A high quality reference genome is an essential resource for plant and animal breeding and functional and evolutionary studies. The common hop (Humulus lupulus, Cannabaceae) is an economically important crop plant used to flavor and preserve beer. Its genome is large (flow cytometrybased estimates of diploid length >5.4Gb1), highly repetitive, and individual plants display high levels of heterozygosity, which make assembly of an accurate and contiguous reference genome challenging with conventional short-read methods. We present a contig assembly of Cascade Hops using PacBio long reads and the diploid genome assembler, FALCON-Unzip2. The assembly has dramatically improved contiguity and completeness over…

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Tuesday, June 1, 2021

Characterizing the pan-genome of maize with PacBio SMRT Sequencing

Maize is an amazingly diverse crop. A study in 20051 demonstrated that half of the genome sequence and one-third of the gene content between two inbred lines of maize were not shared. This diversity, which is more than two orders of magnitude larger than the diversity found between humans and chimpanzees, highlights the inability of a single reference genome to represent the full pan-genome of maize and all its variants. Here we present and review several efforts to characterize the complete diversity within maize using the highly accurate long reads of PacBio Single Molecule, Real-Time (SMRT) Sequencing. These methods provide…

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Tuesday, June 1, 2021

Best practices for whole genome sequencing using the Sequel System

Plant and animal whole genome sequencing has proven to be challenging, particularly due to genome size, high density of repetitive elements and heterozygosity. The Sequel System delivers long reads, high consensus accuracy and uniform coverage, enabling more complete, accurate, and contiguous assemblies of these large complex genomes. The latest Sequel chemistry increases yield up to 8 Gb per SMRT Cell for long insert libraries >20 kb and up to 10 Gb per SMRT Cell for libraries >40 kb. In addition, the recently released SMRTbell Express Template Prep Kit reduces the time (~3 hours) and DNA input (~3 µg), making the…

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Friday, February 5, 2021

PAG Conference: Update on sequencing of the Cabernet sauvignon genome

Grant Cramer from the University of Nevada, Reno, and Dario Cantu from the Univeristy of Callifornia, Davis, discuss past challenges with sequencing Clone 8 of Cabernet Sauvignon (Vitis vinifera). An assembly of the genome was attempted with approximately 110x Illumina reads and 5x PacBio reads. The PacBio SMRT Sequencing read made major improvements in the assembly compared with the results of Illumina reads only. However, the assembly results were still unsatisfactory, so an additional 100-fold SMRT Sequencing coverage had been generated. An update on the current sequencing results and status of the assembly are presented.

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Friday, February 5, 2021

PAG 2016 Highlights: Customer interviews

See what PacBio users had to say about SMRT Sequencing at the Plant and Animal Genome (PAG) Conference in San Diego. This brief video captures highlights from posters, presentations, and the exhibit hall. See how SMRT Sequencing benefits plant and animal scientists in their genomic investigations. [Engligh, some Mandarin]

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Friday, February 5, 2021

Podcast: The 9 billion people problem – Rod Wing on plant genomics

By 2050, there will be 9 billion people on the planet. What will they eat? This is the question that led Rod Wing, Director of the Arizona Genomics Institute, into the field of plant genomics. What has been accomplished so far in the mission to come up with some super green crops? And how does Rod see anti-GMO sentiment and the recent trend toward gluten free diets factoring in? After answering these questions, he dives into a discussion on which sequencing instruments he has used for plant work. Unsurprisingly, Rod prefers the PacBio long reads even though the cost is…

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Friday, February 5, 2021

PAG PacBio Workshop: Introducing 5 new high-quality PacBio genome assemblies for rice to help solve the 10-billion people question

At PAG 2017, Rod Wing presented five new, high-quality rice genome assemblies developed with SMRT Sequencing, including one that has eight complete chromosomes including centromeres. He also offered an early look at data generated with the Sequel System for a new assembly underway. This work is done with the goal of developing rice varieties that will be better suited to feeding a rapidly growing global population.

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Friday, February 5, 2021

PAG PacBio Workshop: SMRT Sequencing for complete genomes

PacBio CSO Jonas Korlach kicks off the PAG 2017 SMRT Sequencing workshop with acknowledgement of the remarkable work scientists have done with long-read sequencing technology, culminating in more than 2,000 papers so far. Also: Sequel System data, new chemistry and software release, longer libraries, and more.

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Friday, February 5, 2021

Video: Get ready for super coffee strains. Scientists just sequenced the plant’s DNA

Genes are the future of coffee. Not nitro cold brewing or beans pooped out by civets, but genes. And coffee’s gene-fueled future just drew nearer, now that scientists have sequenced the genome of the Coffea arabica coffee plant—the species that makes up the vast majority of global production—and made the data public. That means the world is in for a coffee renaissance, as breeders use the information to develop new plant varieties—think new flavors and better resistance to cold and disease. That means more coffee grown in more places, a big deal as global warming throws local climates into chaos.

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