Indirect mass spectrometric methods for characterizing and sequencing oligonucleotides

Area of Science:

• Analytical Chemistry
• Biochemistry
• Molecular Biology

Background:

• Oligonucleotide characterization and sequence determination are crucial in molecular biology.
• Traditional sequencing methods can be challenging for certain oligonucleotide types.
• Mass spectrometry offers a complementary approach for oligonucleotide analysis.

Purpose of the Study:

• To review the application of mass spectrometry for oligonucleotide characterization and sequencing.
• To focus on indirect sequencing methods utilizing sequence-specific fragments.
• To discuss the applicability of these methods for real-world samples, particularly antisense oligonucleotides.

Main Methods:

• Analysis of sequence-specific oligonucleotide fragments generated via solution-phase chemical reactions.
• Utilizing recent advances in electrospray ionization (ESI) and matrix-assisted laser desorption/ionization (MALDI).
• Generation of intact gas-phase ions from oligonucleotides for mass spectrometric analysis.

Main Results:

• Recent advances in ESI and MALDI have significantly improved the analysis of oligonucleotide ions.
• Indirect sequencing protocols provide valuable data for oligonucleotide characterization.
• These methods demonstrate applicability to complex, real-world samples.

Conclusions:

• Mass spectrometry, particularly through indirect sequencing methods, is a powerful tool for oligonucleotide analysis.
• The described protocols are effective for characterizing oligonucleotides, including antisense sequences.
• This approach offers a viable alternative for sequence determination in various biological and therapeutic applications.