DNA/RNA Shearing for NGS
Nucleic acid fragmentation is a crucial first step in the Next-Gen Sequencing workflow. While there are a variety of methods available, mechanical DNA shearing powered by AFA-energetics® remains the method of choice for achieving high sensitivity and unbiased results.
AFA Process for DNA and RNA Shearing
Adaptive Focused Acoustics® (AFA®) technology is firmly established as the fragmentation method of choice for NGS, and Covaris continues to innovate the tools required to shear DNA and RNA without GC bias or thermal damage.
The Covaris AFA process is conducted under isothermal conditions, ensuring the integrity of the nucleic acid sample is maintained and providing high recovery of double-stranded DNA during the shearing process.
Combined with the specifically engineered AFA Tubes it is possible to precisely and accurately fragment DNA and RNA to the 100 – 1500bp range (microTUBE), or 2 – 5kb range (miniTUBE). Focused-ultrasonicators range from the low through-put single-tube full-power S-Series, the mid-throughput, more affordable M-Series, to the higher throughput E and L-Series instruments.
Benefits of RNA or DNA Shearing using AFA Technology
Physical shearing of DNA or RNA using Covaris AFA is concentration independent, isothermal, and highly reproducible. Physical shearing does not require a cleanup step after shearing, thereby preserving the complexity of the sample for library preparation. This shearing method provides unmatched control and reproducibility of shearing.
|Temperature Controlled||Processing at controlled temperatures provides highest yields while preserving sample fidelity|
|Accurate and precise||Highly reproducible process, day to day, user to user. Protocols can be transferred instrument to instrument without further optimization|
|Non-contact, closed vessel||No cross-contamination, clean-up, or sample loss|
|Versatile||Generate tight fragment distribution centered from 100 bp to 20 kbp|
Unparalleled acoustic energy control enables shearing across a wide range of fragment sizes ranging from 150 bp to 5 kb and everything in between. AFA-energetics is the gold standard for DNA shearing providing you with highest sample complexity and unbiased sample yield paving the way for the most cost-effective library prep.
Comparison of Shearing Fragment Sizes
|Fragment Size*||Sample Volume||Covaris Products|
|175 to 1.5 kbp||5 to 50 µl||AFA-TUBE|
|150 to 1.5 kbp||130 µl||microTUBE-130|
|150 to 1.5 kbp||55 µl||microTUBE-50|
|150 to 1.5 kbp||15 µl||microTUBE-15|
|2 kbp||200 µl||miniTUBE-Clear|
|3 kbp||200 µl||miniTUBE-Blue|
|5 kbp||200 µl||miniTUBE-Red|
|6 – 20 kb||150 µl||g-TUBE|
*For validated fragment sizes, refer to the Covaris Focused-ultrasonicator Protocol.