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  • ‹ Back to DNA-seq
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Tech Note

A streamlined solution for generating high-quality NGS libraries from FFPE DNA samples

  • High library diversity
  • Balanced GC coverage
  • High on-bait coverage
Introduction Results Conclusions Methods References

Introduction  

Formalin-fixed, paraffin-embedded (FFPE) samples are typically collected and preserved from human biopsies for histological studies. The formalin fixation method allows storage of the material at room temperature for many years by cross-linking the cellular contents of nucleic acids and proteins and encasing the sample in wax. Biobanks and researchers worldwide have millions of FFPE samples stored. With advances in library preparation and next-generation sequencing (NGS) techniques, nucleic acids preserved in these samples can now be recovered to yield important genomic information. For this reason, archived FFPE samples have become a rich and precious source of study material. Increasingly, research laboratories are utilizing FFPE samples to profile and understand disease-related genes and mutations.

Multiple factors lead to variability in the quality of the DNA that is isolated from FFPE, including chemical alterations that occur to the nucleic acids during the preservation process, the lack of standardization of the preservation process, and the age of the archived samples. The low quality of the isolated DNA from FFPE samples is expected to generate low-complexity NGS libraries, since the "usable" amount of DNA is low, despite the apparent concentrations of isolated DNA.

In order to create libraries with maximum diversity, selecting the right library preparation method is critical. ThruPLEX technology uses stem-loop adapters that obviate the need for intermediate cleanup steps, maintain a single-tube workflow, and preserve the complexity of the libraries. The final amplification makes use of all of the repaired and ligated molecules, resulting in the high number of unique molecules found in the library (Figure 1). As an added benefit, the time to create libraries is reduced to around two hours. ThruPLEX DNA-seq libraries can also be easily integrated with other applications such as target enrichment. The high diversity of the input material ensures that capture will yield libraries with excellent coverage throughout the targeted regions of the genome.

Figure 1. ThruPLEX technology

Figure 1. ThruPLEX technology. This workflow uses a three-step, single-tube reaction that starts with fragmented double-stranded DNA, which is repaired in a highly efficient process. Next, stem-loop adapters are blunt-end ligated to the repaired input DNA. These molecules are extended, then amplified to include barcodes using a high-fidelity polymerase to yield an indexed Illumina NGS library.

In this technical note, we demonstrate the performance and features of the ThruPLEX DNA-seq Kit, our general purpose library preparation kit, when used with FFPE-derived DNA. While the recommended input range suggested by the standard protocol for this kit is 0.05–50 ng for non-FFPE samples, here we increased the input amount to 100 ng to compensate for damaged DNA in the FFPE samples. Our results showed that ThruPLEX DNA-seq technology is an excellent choice for preparing NGS libraries from FFPE-derived DNA for Illumina platforms. Compared to other library preparation kits, it provides more diverse libraries while minimizing GC bias. We further demonstrate how the ThruPLEX DNA-Seq Kit can be successfully integrated with Agilent SureSelect Enrichment Kits to carry out targeted sequencing of FFPE samples.

Results  

ThruPLEX DNA-seq technology produces libraries with greater diversity than either the NEBNext Ultra or the KAPA Hyper kits. On average, ThruPLEX libraries yielded an estimated library size that is 80% larger than NEBNext Ultra and 240% larger than KAPA Hyper, indicating the presence of a greater number of unique molecules in ThruPLEX libraries (Figure 2). As expected, ThruPLEX DNA-seq generated less than 2% of duplicate reads, comparable to NEBNext Ultra, while KAPA Hyper showed the highest range of duplicate reads (3–6%) (Figure 2). An examination of insert sizes of the library molecules showed that the ThruPLEX DNA-Seq Kit produced inserts of 190 bp, approximately equivalent to the KAPA Hyper libraries, but about 27% longer than the 150-bp inserts from NEBNext Ultra (Figure 2). A longer insert size is often advantageous when sequencing paired-end reads, as having more nonoverlapping reads provides a greater representation of the original sequence information.

Figure 2. Highly diverse libraries.

Figure 2. Highly diverse libraries. ThruPLEX DNA-seq libraries provide more unique molecules (top) and fewer duplicates (middle) than other tested kits. Bottom: ThruPLEX DNA-seq creates molecules with an average insert size that is ~27% longer than NEBNext Ultra.

GC coverage of libraries prepared with each of the three kits was compared. The ThruPLEX DNA-Seq Kit produced the most balanced GC coverage (Figure 3).

Figure 3. Uniform GC coverage.

Figure 3. Uniform GC coverage. ThruPLEX DNA-seq libraries made from FFPE-derived DNA produced consistent coverage across the human genome.

ThruPLEX DNA-seq libraries were then enriched using the Agilent ClearSeq Human DNA Kinome panel. In each case, the libraries were shown to be of high quality as evidenced by the data shown in Figure 4. Kinome coverage as measured by the depth of sequencing was sample dependent and sequenced at 40–50X coverage of the targeted panels. All samples had on-bait coverage greater than 70%.

Figure 4. Targeted sequencing metrics of ThruPLEX DNA-seq libraries

Figure 4. Targeted sequencing metrics of ThruPLEX DNA-seq libraries enriched using the Agilent ClearSeq Human DNA Kinome panel.

Conclusions  

FFPE samples can be extremely challenging to sequence. The variable degree of chemical damage introduced during the fixation process reduces the amount of "quality" material available to construct a library. To account for this, the standard ThruPLEX DNA-seq protocol was modified by increasing the input amount to 100 ng in this series of experiments. This allowed us to create libraries that were more diverse (80–240% higher library complexity) and contained fewer duplicates than other library preparation kits.

Methods  

FFPE tissue blocks were obtained from the Cooperative Human Tissue Network (CHTN) from a variety of tissues (see table below) and included tumor tissue (Malignant) along with a matching normal control (normal tissue adjacent to the tumor, or NAT). Six months to one year prior to DNA extraction, the tissue had been fixed in 10% neutral buffered formalin for 12–24 hours before embedding in paraffin blocks. From these blocks, 20-μm thick sections were cut with a microtome, DNA was extracted using QIAamp DNA FFPE Tissue Kit (Qiagen), and each sample was visualized on a Bioanalyzer DNA chip (Agilent Technologies), quantitated by Qubit (Thermo Fisher Scientific), and sheared to an average size of 200 bp using a Covaris shearing instrument.

SampleTypeSource tissue
1 NAT Cervix/uterus
2 Malignant Colon/rectum
3 Malignant Colon/rectum
4 NAT Colon/rectum
5 Malignant Ovary
6 Malignant Kidney
7 NAT Kidney
8 Malignant Kidney
9 NAT Kidney

Libraries were prepared with 100 ng in triplicate using the ThruPLEX DNA-Seq Kit, the NEBNext Ultra DNA Library Preparation Kit (New England Biolabs), or the KAPA Hyper Preparation Kit (Kapa Biosystems). All kits were used following the manufacturer's instructions with the exception that input DNA was increased to 100 ng for the ThruPLEX DNA-Seq Kit (recommended input range 0.05–50 ng). Pooled libraries were sequenced on an Illumina NextSeq® 500 in 2 x 76 bp paired-end runs. Sequence data was analyzed with the Picard Pipeline1 on DNAnexus. Briefly, reads were aligned to the human genome, hg19, using Burrows-Wheeler Algorithm2, BWA-MEM (Li and Durbin), to generate BAM files. Reads were then down-sampled to 2.7M read pairs across all samples. Picard Mark Duplicates (Picard) was used to count duplicate reads and estimate library diversity (Estimated Library Size), and Picard Collect GC Metrics was used to determine biases based on sequence GC content.

ThruPLEX DNA-seq libraries were then subjected to an enrichment step using Agilent ClearSeq Human DNA Kinome panel (~3.2 Mbp) with the Agilent SureSelectXT2 target enrichment kit. Briefly, libraries generated with 100 ng (triplicate) from FFPE samples 4, 6, 7, 8, and 9 (15 total libraries) were pooled and used for capture following our SureSelectXT2 integration protocol. The captured libraries were sequenced on the Illumina NextSeq 500 (2 x 76 mid-output reagent kit). A first low-pass run of all samples was downsampled to 2.7M reads. Deeper sequencing of a subset (1, 3, and 4) was downsampled to 30M reads to more accurately measure the key metrics. For kinome enrichment data, Picard CalculateHsMetrics was used to determine capture quality metrics after mapping with BWA-MEM.

References  

Broad Institute. Picard Tools - A set of command line tools (in Java) for manipulating high-throughput sequencing (HTS) data and formats such as SAM/BAM/CRAM and VCF. http://broadinstitute.github.io/picard/

Li, H. & Durbin, R. Fast and accurate short read alignment with Burrows-Wheeler transform. Bioinformatics 25, 1754–1760 (2009).

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326 This product is protected by U.S. Patents 7,803,550; 8,399,199; 8,728,737, 9,598,727, 10,196,686, 10,208,337, 11,072,823 and corresponding foreign patents. Additional patents are pending. For further license information, please contact a Takara Bio USA licensing representative by email at licensing@takarabio.com.
M54 This product is covered by the claims of U.S. Patent Nos. 7,704,713 and its foreign counterparts. 

The ThruPLEX DNA-Seq Kit builds on the innovative ThruPLEX chemistry to generate high-complexity DNA libraries from as little as 50 pg of DNA. Single index, dual index, and unique dual index kits are available and must be purchased separately. This product contains reagents for 24 reactions.

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Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

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R400674: ThruPLEX DNA-Seq Kit

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R400675 ThruPLEX® DNA-Seq Kit 48 Rxns USD $1360.00

License Statement

ID Number  
326 This product is protected by U.S. Patents 7,803,550; 8,399,199; 8,728,737, 9,598,727, 10,196,686, 10,208,337, 11,072,823 and corresponding foreign patents. Additional patents are pending. For further license information, please contact a Takara Bio USA licensing representative by email at licensing@takarabio.com.
M54 This product is covered by the claims of U.S. Patent Nos. 7,704,713 and its foreign counterparts. 

The ThruPLEX DNA-Seq Kit builds on the innovative ThruPLEX chemistry to generate high-complexity DNA libraries from as little as 50 pg of DNA. Single index, dual index, and unique dual index kits are available and must be purchased separately. This product contains reagents for 48 reactions.

Notice to purchaser

Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

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R400676 ThruPLEX® DNA-Seq Kit 96 Rxns USD $2493.00

License Statement

ID Number  
M54 This product is covered by the claims of U.S. Patent Nos. 7,704,713 and its foreign counterparts. 
326 This product is protected by U.S. Patents 7,803,550; 8,399,199; 8,728,737, 9,598,727, 10,196,686, 10,208,337, 11,072,823 and corresponding foreign patents. Additional patents are pending. For further license information, please contact a Takara Bio USA licensing representative by email at licensing@takarabio.com.

The ThruPLEX DNA-Seq Kit builds on the innovative ThruPLEX chemistry to generate high-complexity DNA libraries from as little as 50 pg of DNA. Single index, dual index, and unique dual index kits are available and must be purchased separately. This product contains reagents for 96 reactions.

Notice to purchaser

Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

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R400676: ThruPLEX DNA-Seq Kit

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R400677 ThruPLEX® DNA-Seq Kit 480 Rxns USD $11040.00

License Statement

ID Number  
M54 This product is covered by the claims of U.S. Patent Nos. 7,704,713 and its foreign counterparts. 
326 This product is protected by U.S. Patents 7,803,550; 8,399,199; 8,728,737, 9,598,727, 10,196,686, 10,208,337, 11,072,823 and corresponding foreign patents. Additional patents are pending. For further license information, please contact a Takara Bio USA licensing representative by email at licensing@takarabio.com.

The ThruPLEX DNA-Seq Kit builds on the innovative ThruPLEX chemistry to generate high-complexity DNA libraries from as little as 50 pg of DNA. Single index, dual index, and unique dual index kits are available and must be purchased separately. This product is composed of five 96-reaction kits (Cat. No. R400676), 480 reactions total, of ThruPLEX DNA-Seq reagents.

Notice to purchaser

Our products are to be used for Research Use Only. They may not be used for any other purpose, including, but not limited to, use in humans, therapeutic or diagnostic use, or commercial use of any kind. Our products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products or to provide a service to third parties without our prior written approval.

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R400677: SMARTer ThruPLEX DNA-Seq Kit

R400677: SMARTer ThruPLEX DNA-Seq Kit


See what our customers are saying about ThruPLEX DNA-seq technology!

"We are very happy with the results and we plan to start using ThruPLEX DNA-seq as a part of our capture workflows. Variants are called with very equal distribution (only a small fraction of low/high coverage extremes). In our classic sample preps, the coverage is not this homogenous, and low tail is much longer. Our lab staff was pleased with the convenience of the ThruPLEX workflow (less manual steps)."
—Pekka Ellonen, Head of DNA Sequencing Laboratory, INSTITUTE FOR MOLECULAR MEDICINE FINLAND FIMM

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