Detection of Locked Nucleic Acid Gapmers from Mouse Muscle Samples Using ELISA

Antisense oligonucleotide (ASO)-mediated therapy is promising for the treatment of a variety of genetic disorders, such as Duchenne muscular dystrophy. As more ASOs advance in therapeutic development and enter clinical trials, it becomes necessary to have a means of quantifying their amounts in biological samples post-treatment. This information will be valuable for evaluating the safety and pharmacokinetic profiles of ASOs, and in deciding how the efficacy of these drugs can be improved. Gapmers are a class of ASOs characterized by having a central DNA portion that is surrounded by chemically modified nucleotides on both ends. While relatively simple and accessible methods to quantify other ASOs such as phosphorodiamidate morpholino oligomers (PMOs) using enzyme-linked immunosorbent assay (ELISA)-based techniques are available and have been used for in vivo studies, no such method is available for gapmers to our knowledge. Here, we describe a sensitive ELISA protocol that can be used to quantify the levels of locked nucleic acid (LNA) gapmers in mouse muscle tissue.