Oligonucleotide Synthesis Market By 2030: Things To Know About Worldwide Industrial Growth

Oligonucleotide synthesis is the chemical process of building short sequences of nucleotides, which are the building blocks of nucleic acids (DNA or RNA). Oligonucleotides are widely used in various fields, including research, diagnostics, and therapeutics. This process involves the stepwise addition of nucleotides to create a desired sequence.

Here's a detailed overview of the oligonucleotide synthesis process:

1. Nucleotide Protection: The synthesis begins with the protection of the 5'-hydroxyl group of the first nucleotide using a protecting group, typically a dimethoxytrityl (DMT) group. The DMT group prevents unwanted reactions during the subsequent steps.
2. Deblocking: If the previous oligonucleotide has been synthesized on solid support, it needs to be deblocked to expose the 5'-hydroxyl group for the addition of the next nucleotide. Deblocking involves the removal of the DMT group using an appropriate deblocking reagent.
3. Coupling: The next nucleotide, with its 3'-hydroxyl group protected, is coupled to the free 5'-hydroxyl group of the growing oligonucleotide chain. The coupling reaction is typically performed using phosphoramidite chemistry, where a phosphoramidite derivative of the nucleotide is reacted with the 5'-hydroxyl group. This reaction forms a phosphite triester linkage between the new nucleotide and the growing chain.
4. Capping: After the coupling step, it is necessary to cap any unreacted 5'-hydroxyl groups to prevent their further reaction in subsequent coupling steps. Capping involves the addition of a capping agent, which reacts with the unreacted hydroxyl groups, rendering them unreactive.
5. Oxidation: The phosphite triester linkage formed in the coupling step needs to be converted to a stable phosphodiester linkage. This is achieved by oxidizing the phosphite triester using an oxidizing reagent, such as iodine or tert-butyl hydroperoxide. Oxidation generates a phosphate group and removes the remaining protecting groups from the nucleotide.
6. Repeating Steps 2-5: Steps 2 to 5 are repeated iteratively to add additional nucleotides and extend the oligonucleotide chain. Each repetition introduces a new nucleotide, one at a time, until the desired sequence is achieved.
7. Final Deprotection and Purification: Once the desired sequence is synthesized, the oligonucleotide needs to be deprotected. This involves the removal of all remaining protecting groups from the nucleotides, typically by treatment with a deblocking reagent. The oligonucleotide is then purified to remove any impurities and excess reagents. Purification methods may include high-performance liquid chromatography (HPLC) or solid-phase extraction (SPE).
8. Analysis and Quality Control: The synthesized oligonucleotide is analyzed using techniques such as UV spectrophotometry or capillary electrophoresis to determine its concentration, purity, and sequence. Quality control checks are performed to ensure the integrity of the final product.

It's worth noting that there are different methods and variations of oligonucleotide synthesis, such as solid-phase synthesis and solution-phase synthesis. Solid-phase synthesis is the most commonly used method, where the growing oligonucleotide chain is attached to a solid support during the synthesis steps.

Oligonucleotide synthesis has greatly contributed to advancements in molecular biology, genetic engineering, and medical research, enabling the development of various applications such as DNA sequencing, PCR (polymerase chain reaction), gene synthesis, gene editing (e.g., CRISPR), and the production of therapeutic oligonucleotides for targeted therapies and gene silencing.