Non-ATXN2 mRNAs with partial seed-region complementarity

Non-ATXN2 mRNAs with partial seed-region complementarity refers to a diverse group of messenger RNA transcripts that are unintentionally targeted by antisense oligonucleotides (ASOs) designed to silence the ATXN2 gene. This phenomenon occurs when an ASO sequence exhibits sufficient homology to non-target mRNAs, particularly within the 'seed' region, to facilitate hybridization and subsequent degradation via RNase H1 or other silencing mechanisms (Kamola et al., 2015). In the development of therapies for neurodegenerative diseases like Amyotrophic Lateral Sclerosis (ALS) and Spinocerebellar Ataxia Type 2 (SCA2), such off-target effects are a critical safety concern (Scoles et al., 2017). For instance, drugs like BIIB105 must be carefully screened to minimize interactions with these non-target transcripts to avoid cellular toxicity or loss-of-function in essential genes (Biogen, 2024). These mRNAs do not constitute a therapeutic target but rather represent a significant hurdle in ensuring the specificity and safety of RNA-targeted medicines. Rigorous bioinformatic screening and transcriptome-wide profiling are required to identify and mitigate the risks associated with these off-target interactions (Becker et al., 2017).

Other names

Off-target transcriptsSeed-region off-targetsNon-specific ASO binding sitesHybridization-dependent off-targets

Hybridization-dependent off-target knockdown via RNase H1-mediated cleavage or steric hindrance of translation.