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Author(s): Baybayan, Primo and Lawniczak, Mara K. and Wyschetzki, Katharina von and Oliver, Karen and Corton, Craig and McCarthy, Shane and Berriman, Matt and Blaxter, Mark and Smith, Michelle and Gendrin, Mathilde and Herren, Jeremy and Nsango, Sandrine and Kingan, Sarah B. and Lambert, Christine C. and Chakraborty, Shreyasee and Dhillon, Harsharan and Wenger, Aaron and Korlach, Jonas

The latest advancements in Sequel II SMRT Sequencing have increased average read lengths up to 50% compared to Sequel II chemistry 1.0 which allows multiplexing of 2-3 small organisms (<500 Mb) such as insects and worms for producing reference quality assemblies, calling structural variants for up to 2 samples with ~3 Gb genomes, analysis of 48 microbial genomes, and up to 8 communities for metagenomic profiling in a single SMRT Cell 8M. With the improved processivity of the new Sequel II sequencing polymerase, more SMRTbell molecules reach rolling circle mode resulting in longer overall read lengths, thus allowing efficient detection of barcodes (up to 80%) in the SMRTbell templates. Multiplexing of genomes larger than microbial organisms is now achievable. In collaboration with the Wellcome Sanger Institute, we have developed a workflow for multiplexing two individual Anopheles coluzzii using as low as 150 ng genomic DNA per individual. The resulting assemblies had high contiguity (contig N50s over 3 Mb) and completeness (>98% of conserved genes) for both individuals. For microbial multiplexing, we multiplexed 48 microbes with varying complexities and sizes ranging 1.6-8.0 Mb in single SMRT Cell 8M. Using a new end-to-end analysis (Microbial Assembly Analysis, SMRT Link 8.0), assemblies resulted in complete circularized genomes (>200-fold coverage) and efficient detection of >3-200 kb plasmids. Finally, the long read lengths (>90 kb) allows detection of barcodes in large insert SMRTbell templates (>15 kb) thus facilitating multiplex of two human samples in 1 SMRT Cell 8M for detecting SVs, Indels and CNVs. Here, we present results and describe workflows for multiplexing samples for specific applications for SMRT Sequencing.

Organization: PacBio
Year: 2020

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