Analyzing Poly(A) and Poly(T) Tail Lengths in Plasmid DNA
Author Information
Author(s): Nour Al Turihi, Delphine Allouche, Maëlle Quéré, Mathieu Scuiller, Isabelle Legastelois
Primary Institution: Sanofi
Hypothesis
Can a novel method using LC-MS accurately assess poly(A) and poly(T) tail lengths in plasmid DNA?
Conclusion
The developed LC-MS method can accurately determine poly(A) and poly(T) tail lengths in plasmid DNA, revealing minor populations not detected by Sanger sequencing.
Supporting Evidence
- The LC-MS method revealed minor poly(A) populations that Sanger sequencing could not detect.
- Three DNA templates with different poly(A) tail lengths were analyzed.
- The method is quick and easy to implement.
- LC-MS provided a single-nucleotide resolution for tail length assessment.
- Electrophoresis methods lacked the resolution to accurately determine tail lengths.
Takeaway
This study created a new way to measure the lengths of special parts of DNA that help make vaccines, showing that some lengths are different than expected.
Methodology
The study used ion-pair reversed-phase liquid chromatography coupled to high-resolution mass spectrometry (IP-RP-LC-HRMS) to analyze poly(A) and poly(T) tails in plasmid DNA.
Potential Biases
Potential bias introduced during the PCR amplification step.
Limitations
The method may introduce bias during the amplification step, and the resolution of other methods like Sanger sequencing is insufficient to detect minor populations.
Digital Object Identifier (DOI)
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