Research-grade oligonucleotides or Research Use Only (RUO) oligonucleotides are short strands of synthetic DNA or RNA manufactured specifically for laboratory research, assay development, and in vitro testing.
Unlike clinical-grade therapeutic oligonucleotides, research-grade products offer rapid turnaround, flexible modification options, and cost-efficiency.
A few practical parameters define research-grade oligos:
- Research-grade oligonucleotides are produced in standard laboratory environments rather than under strict GMP (Good Manufacturing Practice) regulations. Research-grade oligonucleotides come without exhaustive, legally binding documentation and cleanroom validation required for therapeutics.
- Depending on the application, the purity can range from raw, unpurified mixtures (desalted) to highly purified single-species products.
- Research-grade oligonucleotides are typically synthesized at scales ranging from 25 nmol to 10 µmol; however, customers can order larger bulk quantities for high-throughput screening.
| Purity Level | Description | Typical Application |
| Desalted | Residual biproducts from synthesis chemicals are removed, but short, truncated failure sequences (n-1, n-2 mers) can remain in the mix. | Standard PCR priming, DNA sequencing, high-throughput screening. |
| PAGE Purified | Polyacrylamide Gel Electrophoresis separates the target sequence from truncated fragments with single-base resolution. | Long oligos (greater than 50 bases), cloning, mutagenesis. |
| HPLC Purified | High-Performance Liquid Chromatography isolates the correct mass based on hydrophobicity or charge. Excellent for separating modified oligos from un-modified failures. | qPCR probes, in vitro cell assays, structural biology (NMR/X-ray). |
Technical Capabilities & Modifications
With few regulatory constraints, research-grade oligos offer a wide range of chemical modifications. Many of these can readily incorporate during synthesis:
Examples of backbone modifications include phosphorothioate (PS) linkages to resist nuclease degradation, as well as advanced chemistries such as mesyl phosphoramidate (MsPA) and phosphorodiamidate morpholino (PMO) structures.
Examples of sugar modifications include 2'-O-methyl (2'-OMe), 2'-Fluoro (2'-F), or Locked Nucleic Acids (LNA) to tune binding affinities.
Examples of conjugations and labels include fluorescent dyes (FAM, Cy5), quenchers, biotin tags, and targeting ligands such as GalNAc for cellular uptake studies.
Please note: Research-grade oligos are strictly labeled RUO (Research Use Only). They are not sterilized or tested for endotoxins, pyrogens, or bioburden to the level required for in vivo animal therapeutics or human clinical trials.