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Friday, April 23, 2021

Case Study: Sequencing an historic bacterial collection for the future

The UK’s National Collection of Type Cultures (NCTC) is a unique collection of more than 5,000 expertly preserved and authenticated bacterial cultures, many of historical significance. Founded in 1920, NCTC is the longest established collection of its type anywhere in the world, with a history of its own that has reflected — and contributed to — the evolution of microbiology for more than 100 years.

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Friday, February 26, 2021

Automated, non-hybrid de novo genome assemblies and epigenomes of bacterial pathogens.

Understanding the genetic basis of infectious diseases is critical to enacting effective treatments, and several large-scale sequencing initiatives are underway to collect this information. Sequencing bacterial samples is typically performed by mapping sequence reads against genomes of known reference strains. While such resequencing informs on the spectrum of single-nucleotide differences relative to the chosen reference, it can miss numerous other forms of variation known to influence pathogenicity: structural variations (duplications, inversions), acquisition of mobile elements (phages, plasmids), homonucleotide length variation causing phase variation, and epigenetic marks (methylation, phosphorothioation) that influence gene expression to switch bacteria from non- pathogenic to pathogenic…

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Friday, February 26, 2021

Automated, non-hybrid de novo genome assemblies and epigenomes of bacterial pathogens

Understanding the genetic basis of infectious diseases is critical to enacting effective treatments, and several large-scale sequencing initiatives are underway to collect this information. Sequencing bacterial samples is typically performed by mapping sequence reads against genomes of known reference strains. While such resequencing informs on the spectrum of single nucleotide differences relative to the chosen reference, it can miss numerous other forms of variation known to influence pathogenicity: structural variations (duplications, inversions), acquisition of mobile elements (phages, plasmids), homonucleotide length variation causing phase variation, and epigenetic marks (methylation, phosphorothioation) that influence gene expression to switch bacteria from non-pathogenic to pathogenic…

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Friday, February 26, 2021

New discoveries from closing Salmonella genomes using Pacific Biosciences continuous long reads.

The newer hierarchical genome assembly process (HGAP) performs de novo assembly using data from a single PacBio long insert library. To assess the benefits of this method, DNA from several Salmonella enterica serovars was isolated from a pure culture. Genome sequencing was performed using Pacific Biosciences RS sequencing technology. The HGAP process enabled us to close sixteen Salmonella subsp. enterica genomes and their associated mobile elements: The ten serotypes include: Salmonella enterica subsp. enterica serovar Enteritidis (S. Enteritidis) S. Bareilly, S. Heidelberg, S. Cubana, S. Javiana and S. Typhimurium, S. Newport, S. Montevideo, S. Agona, and S. Tennessee. In addition,…

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Friday, February 26, 2021

Comparative genome analysis of Clavibacter michiganensis subsp. michiganensis strains provides insights into genetic diversity and virulence.

Clavibacter michiganensis subsp. michiganensis (Cmm) is a gram positive actinomycete, causing bacterial canker of tomato (Solanum lycopersicum) a disease that can cause significant losses in tomato production. In this study, we determined the complete genome sequence of 13 California Cmm strains and one saprophytic Clavibacter strain using a combination of Ilumina and PacBio sequencing. The California Cmm strains have genome size (3.2 -3.3 mb) similar to the reference strain NCPPB382 (3.3 mb) with =98% sequence identity. Cmm strains from California share =92% genes (8-10% are noble genes) with the reference Cmm strain NCPPB382. Despite this similarity, we detected significant alternatives…

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Friday, February 26, 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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Friday, February 26, 2021

Single chromosomal genome assemblies on the Sequel System with Circulomics high molecular weight DNA extraction for microbes

Background: The Nanobind technology from Circulomics provides an elegant HMW DNA extraction solution for genome sequencing of Gram-positive and -negative microbes. Nanobind is a nanostructured magnetic disk that can be used for rapid extraction of high molecular weight (HMW) DNA from diverse sample types including cultured cells, blood, plant nuclei, and bacteria. Processing can be completed in 7 kb repeats. Fragment size was increased to ~14 kb, with some fragments >30 kb. Results: Here we present a demonstration of these capabilities using isolates relevant to high-throughput sequencing applications, including common foodborne pathogens (Shigella, Listeria, Salmonella), and species often seen in…

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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.

Read More »

Friday, February 5, 2021

Movie: The new biology

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

Movie: The new biology part I – introduction

Part I 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

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.

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Friday, February 5, 2021

AGBT Virtual Poster: Interspecies interation amoung meat spoilage-related lactic acid bacteria

In this AGBT 2017 poster, the University of Helsinki’s Petri Auevinen reports on efforts to understand bacteria that grow on, and subsequently spoil, food. This analysis monitored DNA modifications and transcriptomic changes in three species of lactic acid bacteria. Scientists discovered that the organisms’ metabolic profiles change substantially when grown together compared to those cultured individually, and are now studying how Cas protein activity changes under these conditions too.

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Friday, February 5, 2021

Webinar: Long-read sequencing and infectious disease: New insights into longstanding challenges

One of the longstanding challenges in infectious disease has been the lack of high-quality reference genomes. However, developments in genome sequencing are helping researchers overcome this barrier. Recently, highly contiguous genome assemblies of Plasmodium falciparum, Aedes aegypti, and multiple trypanosomes have become available. The number of reference genomes for bacteria that cause infectious disease is similarly expanding rapidly. In this webinar Meredith Ashby discusses how these new resources are already yielding new biological insights into critical questions in infectious disease research, including how parasites evade the immune system add how pathogens are adapting to evolutionary pressures.

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