High-performance affinity chromatography of messenger RNA

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• Oligonucleotide purification and messenger RNA (mRNA) isolation are crucial in molecular biology.
• Existing methods can be time-consuming and may affect RNA integrity.

Purpose of the Study:

• To develop and evaluate DNA-silica columns for efficient separation and purification of polynucleotides, specifically adenylic acid oligomers and poly(A) mRNA.
• To assess the speed, resolution, and utility of the purified mRNA in downstream enzymatic applications.

Main Methods:

• Coupling of a 50-mer of thymidylic acid (dT)50 to silica using N-hydroxysuccinimide chemistry to create (dT)50-silica columns.
• Resolution of adenylic acid oligomers ((dA)19-24) and purification of poly(A) mRNA from Saccharomyces using the prepared columns.
• Analysis of the purified poly(A) mRNA for integrity and suitability for enzymatic reactions (T4 RNA ligase, RNAse A, RNAse T1).

Main Results:

• The (dT)50-silica columns effectively resolved adenylic acid oligomers differing by a single nucleotide.
• Poly(A) mRNA purification from Saccharomyces was achieved in as little as 8 minutes.
• Isolated poly(A) mRNA was full-length and functional in subsequent enzymatic assays.
• Fractionation of poly(A) mRNA by tail length was demonstrated, though fractions contained multiple tail lengths, prompting discussion on RNA features versus method limitations.

Conclusions:

• DNA-silica columns provide a rapid and high-resolution method for separating polynucleotides, including mRNA.
• This technique offers an efficient alternative for purifying functional poly(A) mRNA.
• The method shows promise for fractionating RNA based on poly(A) tail length, with potential implications for understanding RNA biology.