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April 20, 2022  |  Sample + library preparation

Technical note — Gel cassette size selection methods for WGS HiFi libraries

PacBio recommends to use size-selection beads are to remove short DNA fragments and enrich for the long fragments that are most valuable for downstream analysis. Although size-selection beads have many advantages, alternative methods — like gels and DNA precipitation — offer more flexibility in defining a size cutoff. This technical note provides guidance for alternative methods of size selection of WGS libraries prepared with the SMRTbell prep kit 3.0.


April 20, 2022  |  Human genetics research

Technical note — Human whole blood sample prep

Sample preparation is a critical factor for whole genome sequencing (WGS) projects that impacts sequencing yield, read length, and ultimately performance for variant calling and genome assembly. Best practices to optimize performance for PacBio HiFi sequencing are to collect whole human blood, store with potassium EDTA as the anticoagulant for fewer than 2 days at 4°C, and extract DNA from 200 μL of blood using the Nanobind CBB Big DNA kit. When it is not possible to extract from fresh samples, storing samples at 4°C maximizes extraction yield and minimizes degradation for at least 9 days.


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