Why dsRNA Impurities Matter
in IVT mRNA & saRNA
RNA size is only one part of quality control. Learn why double-stranded RNA is an important impurity to monitor in IVT RNA workflows.
In vitro transcription (IVT) is widely used to produce mRNA, long RNA and self-amplifying RNA (saRNA).
But an IVT reaction does not necessarily generate only the intended single-stranded RNA transcript.
A variety of unwanted RNA species can also be generated, including double-stranded RNA (dsRNA).
RNA Ladder + electrophoresis
dsRNA-specific detection
What Is a dsRNA Impurity?
During IVT, RNA polymerase transcribes a DNA template to produce the intended RNA. However, unintended complementary RNA species may also form.
When complementary strands hybridize, they can create double-stranded RNA byproducts.
Single-stranded RNA
dsRNA · Short RNA · Other RNA species
Why Does dsRNA Matter?
Double-stranded RNA can resemble molecular patterns associated with viral RNA, allowing cells to recognize it through innate RNA-sensing pathways.
Innate Immune Recognition
dsRNA can interact with RNA-sensing pathways involving receptors such as TLR3, RIG-I and MDA5.
RNA Translation
dsRNA-associated cellular responses may reduce efficient translation of the intended RNA.
Purification Assessment
Measuring dsRNA before and after purification can help researchers compare RNA purification strategies.
RNA Ladder vs. dsRNA ELISA
These tools answer different questions.
| QC Question | Approach | Information |
|---|---|---|
| Is the RNA the expected size? | RNA Ladder | Size / migration |
| Does the RNA appear intact? | Electrophoresis | Band pattern / degradation |
| How much dsRNA is present? | J2-based dsRNA ELISA | Quantitative dsRNA measurement |
What Is the J2 Antibody?
J2 is a monoclonal antibody commonly used to detect double-stranded RNA.
J2-based detection can be used in techniques such as dot blot, while an ELISA format can provide a standard-curve-based quantitative readout for comparing dsRNA levels between samples.
Double-Stranded RNA (dsRNA) ELISA Kit
A quantitative double-antibody sandwich ELISA designed for detecting double-stranded RNA in IVT RNA research samples.
dsRNA
Sandwich ELISA
OD 450 nm
Standard curve
J2 Dot Blot or dsRNA ELISA?
Dot Blot
- Detect dsRNA signal
- Relative sample comparison
- Useful screening approach
Quantitative ELISA
- Standard curve-based analysis
- Quantitative comparison
- 96-well workflow
- Process optimization studies
Evaluate RNA Purification Performance
One practical application of dsRNA analysis is comparing pre- and post-purification samples.
dsRNA Measurement
dsRNA Measurement
A Practical IVT RNA QC Workflow
6K / 9K / 12K / 15K RNA Ladder
J2-based dsRNA ELISA
Which RNA ladder should you use?
Compare 6K, 9K, 12K and 15K RNA ladders for long IVT RNA, mRNA and saRNA applications.
Read the RNA Ladder Selection Guide →Go Beyond RNA Size
Build a research QC workflow for long RNA, mRNA and saRNA with high-range RNA ladders and dsRNA detection tools.
Explore RNA QC Solutions Find dsRNA ELISAFor Research Use Only. This article is intended to provide general information about research-use RNA QC workflows.