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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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Tuesday, June 1, 2021

Complete HIV-1 genomes from single molecules: Diversity estimates in two linked transmission pairs using clustering and mutual information.

We sequenced complete HIV-1 genomes from single molecules using Single Molecule, Real- Time (SMRT) Sequencing and derive de novo full-length genome sequences. SMRT sequencing yields long-read sequencing results from individual DNA molecules with a rapid time-to-result. These attributes make it a useful tool for continuous monitoring of viral populations. The single-molecule nature of the sequencing method allows us to estimate variant subspecies and relative abundances by counting methods. We detail mathematical techniques used in viral variant subspecies identification including clustering distance metrics and mutual information. Sequencing was performed in order to better understand the relationships between the specific sequences of…

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Tuesday, June 1, 2021

Rapid sequencing of HIV-1 genomes as single molecules from simple and complex samples.

Background: To better understand the relationships among HIV-1 viruses in linked transmission pairs, we sequenced several samples representing HIV transmission pairs from the Zambia Emory HIV Research Project (Lusaka, Zambia) using Single Molecule, Real-Time (SMRT) Sequencing. Methods: Single molecules were sequenced as full-length (9.6 kb) amplicons directly from PCR products without shearing. This resulted in multiple, fully-phased, complete HIV-1 genomes for each patient. We examined Single Genome Amplification (SGA) prepped samples, as well as samples containing complex mixtures of genomes. We detail mathematical techniques used in viral variant subspecies identification, including clustering distance metrics and mutual information, which were used…

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Tuesday, June 1, 2021

Characterization of NNRTI mutations in HIV-1 RT using Single Molecule, Real-Time SMRT Sequencing.

Background: Genotypic testing of chronic viral infections is an important part of patient therapy and requires assays capable of detecting the entire spectrum of viral mutations. Single Molecule, Real-Time (SMRT) sequencing offers several advantages to other sequencing technologies, including superior resolution of mixed populations and long read lengths capable of spanning entire viral protein coding regions. We examined detection sensitivity of SMRT sequencing using a mixture of HIV-1 RT gene coding regions containing single NNRTI mutations. Methodology: SMRTbell templates were prepared from PCR products generated from a prospective reference material being developed by BC Center of Excellence for HIV/AIDS, and…

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Tuesday, June 1, 2021

Full-length HIV-1 env deep sequencing in a donor with broadly neutralizing V1/V2 antibodies.

Background: Understanding the co-evolution of HIV populations and broadly neutralizing antibodies (bNAbs) may inform vaccine design. Novel long-read, next-generation sequencing methods allow, for the first time, full-length deep sequencing of HIV env populations. Methods: We longitudinally examined HIV-1 env populations (12 time points) in a subtype A infected individual from the IAVI primary infection cohort (Protocol C) who developed bNAbs (62% ID50>50 on a diverse panel of 105 viruses) targeting the V1/V2 loop region. We developed a PacBio single molecule, real-time sequencing protocol to deeply sequence full-length env from HIV RNA. Bioinformatics tools were developed to align env sequences, infer…

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Tuesday, June 1, 2021

Full-length env deep sequencing in a donor with broadly neutralizing V1/V2 antibodies.

Background: Understanding the co-evolution of HIV populations and broadly neutralizing antibody (bNAb) lineages may inform vaccine design. Novel long-read, next-generation sequencing methods allow, for the first time, full-length deep sequencing of HIV env populations. Methods: We longitudinally examined env populations (12 time points) in a subtype A infected individual from the IAVI primary infection cohort (Protocol C) who developed bNAbs (62% ID50>50 on a diverse panel of 105 viruses) targeting the V1/V2 region. We developed a Pacific Biosciences single molecule, real-time sequencing protocol to deeply sequence full-length env from HIV RNA. Bioinformatics tools were developed to align env sequences, infer…

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Tuesday, June 1, 2021

Long-read assembly of the Aedes aegypti Aag2 cell line genome resolves ancient endogenous viral elements

Transmission of arboviruses such as Dengue Virus by Aedes aegypti causes debilitating disease across the globe. Disease in humans can include severe acute symptoms such as hemorrhagic fever and organ failure, but mosquitoes tolerate high titers of virus in a persistent infection. The mechanisms responsible for this viral tolerance are unclear. Recent publications highlighted the integration of genetic material from non-retroviral RNA viruses into the genome of the host during infection that relies upon endogenous retro-transcriptase activity from transposons. These endogenous viral elements (EVEs) found in the genome are predicted to be ancient, and at least some EVEs are under…

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Tuesday, June 1, 2021

Long-read assembly of the Aedes aegypti Aag2 cell line genome resolves ancient endogenous viral elements

Transmission of arboviruses such as Dengue and Zika viruses by Aedes aegypti causes widespread and debilitating disease across the globe. Disease in humans can include severe acute symptoms such as hemorrhagic fever, organ failure, and encephalitis; and yet, mosquitoes tolerate high titers of virus in a persistent infection. The mechanisms responsible for tolerance to viral infection in mosquitoes are still unclear. Recent publications have highlighted the integration of genetic material from non-retroviral RNA viruses into the genome of the host during infection that relies upon endogenous retro-transcriptase activity from transposons. These endogenous viral elements (EVEs) found in the genome are…

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Friday, February 5, 2021

Movie: The new biology part II – cancer

Part II of The New Biology documentary. This documentary film features the wave of cutting-edge technologies that now provide the opportunity to create predictive models of living systems, and gain wisdom about the fundamental nature of life itself. The potential impact for humanity is immense: from fighting complex diseases such as cancer, enabling proactive surveillance of virulent pathogens, and increasing food crop production.

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Friday, February 5, 2021

Movie: The new biology part IV – food & conclusion

Part IV of The New Biology documentary. This documentary film features the wave of cutting-edge technologies that now provide the opportunity to create predictive models of living systems, and gain wisdom about the fundamental nature of life itself. The potential impact for humanity is immense: from fighting complex diseases such as cancer, enabling proactive surveillance of virulent pathogens, and increasing food crop production.

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Friday, February 5, 2021

Video: Overview of SMRT technology

PacBio’s SMRT technology harnesses the natural process of DNA replication, which is a highly efficient and accurate process. Our SMRT technology enables the observation of DNA synthesis as it occurs in real time.

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Friday, February 5, 2021

Movie: The new biology part III – infectious disease

Part III of The New Biology documentary. This documentary film features the wave of cutting-edge technologies that now provide the opportunity to create predictive models of living systems, and gain wisdom about the fundamental nature of life itself. The potential impact for humanity is immense: from fighting complex diseases such as cancer, enabling proactive surveillance of virulent pathogens, and increasing food crop production.

Read More »

Friday, February 5, 2021

AGBT PacBio Workshop: Full workshop recording

PacBio customers and thought leaders discuss the role SMRT sequencing is playing in comprehensive genomics: past, present, and future. Featuring J. Craig Venter, Gene Myers, Deanna Church, Jeong-Sun Seo and W. Richard McCombie.

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Friday, February 5, 2021

PAG Conference: The Bat1K project: bat genome, biology and implications

In this presentation, Sonja Vernes of the Max Plank Institute shares her work with the Bat1K project which aims to catalog the genetic diversity of all living bat species. She highlights the unique biology of bats, from their widely varying sizes to their capacity for healthy aging and disease resistance and provides recent findings from ongoing efforts to sequence and annotate the genomes of 21 phylogenetic families of bats.

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