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Oligonucleotide drugs are short sequences of nucleotides designed to interact with specific target molecules within cellular pathways. These drugs include antisense oligonucleotides, small interfering RNAs, microRNA, and aptamers.
In recent years, a once-obscure drug delivery technology has risen to prominence—lipid nanoparticles (LNPs). From mRNA vaccines and cancer immunotherapy to cutting-edge gene editing, LNPs are redefining the landscape of modern medicine.
circRNA is a type of RNA molecule that is a single-stranded closed ring formed by covalent bonds. First, because it lacks free ends, it is not easily degraded by nucleases and has stability. Secondly, the purified engineered circRNA shows low immunogenicity and side effects in vivo, reflecting its safety advantage as a drug. Compared with linear mRNA, circRNA with a closed-loop structure has become an attractive alternative due to its excellent stability, low immunogenicity and sustained expression.
RNA editing, as a precise and reversible gene modification technology that does not introduce DNA double-strand breaks, is emerging as an important branch of RNA-based therapeutics. Unlike conventional strategies such as mRNA vaccines, siRNA, or antisense oligonucleotides that primarily alter the expression level of gene products, RNA editing directly corrects single nucleotides on RNA molecules, enabling precise restoration or modification of protein function at the transcript level. With the rapid development of novel editing enzymes, delivery systems, and target design strategies, RNA editing is transitioning from basic research to clinical exploration, showing unique potential in treating rare genetic disorders, neurodegenerative diseases, and certain metabolic conditions.
nucleic acid aptamers have become an important class of synthetic ligands with broad potential across biomedical research and therapeutic development. Derived entirely through in vitro selection, these single-stranded oligonucleotides can fold into defined three-dimensional structures that enable high-affinity and high-specificity binding to a wide range of molecular targets. Continuous refinements in SELEX methodology, coupled with advances in chemical modification and screening technologies, have transformed aptamer research from a conceptual framework into practical biomedical applications.
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