A three-method LC toolbox for mRNA poly(A) tail characterisation

By
  • Lara Nercessian
  • Simon Husser
  • Thomas Menneteau
  • Claire Butré
  • Damien Mouvet
  • Arnaud Delobel
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mRNA therapeutics are widely used in vaccines and protein‑based therapies, making robust analytical characterisation essential to ensure consistent product quality. The 3′ poly(A) tail is a critical quality attribute, directly impacting mRNA stability and translation efficiency.

This application note describes three complementary liquid chromatography (LC) methods for mRNA poly(A) tail characterisation after enzymatic digestion, providing a practical analytical toolbox for both routine quality control and in‑depth structural analysis.

Analytical approach overview

Three complementary LC‑based methods were developed to characterise mRNA poly(A) tails following RNase T1 digestion: SEC‑UV, IP‑RP‑UV and IP‑RP‑MS.

  • SEC‑UV enables rapid, calibration‑based determination of poly(A) tail length and provides information on tail polydispersity.
  • IP‑RP‑UV uses an orthogonal separation mechanism and a bracketing strategy to correct retention‑time drift, achieving robust length determination with RSD values below 0.5%.
  • IP‑RP‑MS delivers molecular‑level selectivity, enabling comprehensive profiling of poly(A) tail length distributions across the entire mRNA population.

Consistent poly(A) tail length values were obtained across multiple commercial mRNA samples using all three methods.

Supporting routine QC and in‑depth poly(A) tail characterisation

This three‑method LC toolbox supports reliable poly(A) tail characterisation throughout mRNA development and quality control. It:

  • Enables accurate determination of poly(A) tail length as a critical quality attribute.
  • Supports routine and high‑throughput QC using SEC‑UV and IP‑RP‑UV methods.
  • Provides orthogonal confirmation of results through complementary LC techniques.
  • Allows detailed assessment of poly(A) tail heterogeneity and distribution using IP‑RP‑MS.

The approach can be adapted to different analytical depth requirements and development stages.

Applications

  • Routine quality control of mRNA poly(A) tail length using UV‑based LC methods
  • Evaluation of poly(A) tail length distribution and polydispersity
  • In‑depth analysis of poly(A) tail composition and heterogeneity by LC‑MS

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