Absolute quantification, using sealed-chip technology, for a reliable method and precise, sensitive data.
Next-generation sequencing (NGS) libraries can be quantified with minimal sample handling and without the need to generate a standard curve using digital PCR. This method enables accurate and precise library quantification, a critical step in both the Ion Torrent™ and Illumina® workflows, allowing for maximizing sequencing yields downstream. To achieve this high degree of precision, a TaqMan® Assay, designed to span both the forward and reverse adapters specific to each library, is available.
This approach limits quantification to library constructs that contain both adapter sequences. Ultimately, using digital PCR to quantify NGS libraries decreases overall sequencing costs by ensuring an accurate quantification upfront, minimizing the need to re-run or repeat sequencing of samples.
|Sample name||Library type (size)||Concentration determined by digital PCR||Templated beads pre-enrichment|
|L7734||Fragment (276 bp)||3.32 nM||12.1%|
Fragment (489 bp)
|L2444||Fragment (322 bp)||11.03 nM||10%|
Table 1: Correlation of QuantStudio™ 3D Digital PCR data with that of the Ion OneTouch™ 2 data. These quality-control data were generated for four Ion Torrent™ libraries using flow cytometry prior to enrichment.
Figure 3. Alternative views in the Absolute Quantification application module of the QuantStudio™ 3D AnalysisSuite™ software of the small RNA (A) and Nextera (B) libraries. Example of a chip view depicting color by calls, which shows the distribution of both the VIC (amplified) and the non-amplified wells. Note that a random distribution of VIC signal across the chip is ideal. The histogram view has two populations, the larger yellow population corresponds to the non-amplified wells with a lower fluorescence and the smaller red population corresponds to the amplified wells with a significantly higher fluorescence. The separation between non-amplified and amplified populations is indicative of good discrimination.
Figure 4. Correlation of QuantStudio™ 3D Digital PCR data with that of the Illumina® cluster density data. (A) Graph depicting the concentration (nM) for five Illumina® libraries as determined by the QuantStudio™ 3D Digital PCR System. (B) Cluster densities for the same libraries generated by the HiSeq. Library 2 shows under clustering as is evident by the lower concentration as calcuated by dPCR.
Peter Schweitzer, PhD, Director of the Genomics Facility at Cornell University, Ithaca, New York
Application Note: Precise quantification of Illumina® libraries on the QuantStudio 3D Digital PCR System Application Note: Precise Quantification of Ion Torrent™ Libraries on the QuantStudio 3D Digital PCR System Demonstrated protocols in Digital PCR Community
Product Bulletin: QuantStudio 3D Digital PCR System
User Guide: QuantStudio 3D Digital PCR System
Digital PCR Experiment Design Guide
Poster: Precise Quantification of Next Generation Sequencing Ion Torrent Libraries with the QuantStudio 3D Digital PCR Platform
For Research Use Only. Not for use in diagnostic procedures.