UMMS Affiliation

Department of Medicine

Publication Date


Document Type



Base Pairing; Base Sequence; Cell Line; Down-Regulation; Exons; Humans; Introns; Muscular Atrophy, Spinal; Oligonucleotides, Antisense; RNA Splicing; Survival of Motor Neuron 2 Protein


Biochemistry, Biophysics, and Structural Biology | Life Sciences | Medicine and Health Sciences


Spinal muscular atrophy (SMA) is the leading genetic cause of infant mortality. Most SMA cases are associated with the low levels of SMN owing to deletion of Survival Motor Neuron 1 (SMN1). SMN2, a nearly identical copy of SMN1, fails to compensate for the loss of SMN1 due to predominant skipping of exon 7. Hence, correction of aberrant splicing of SMN2 exon 7 holds the potential for cure of SMA. Here we report an 8-mer antisense oligonucleotide (ASO) to have a profound stimulatory response on correction of aberrant splicing of SMN2 exon 7 by binding to a unique GC-rich sequence located within intron 7 of SMN2. We confirm that the splicing-switching ability of this short ASO comes with a high degree of specificity and reduced off-target effect compared to larger ASOs targeting the same sequence. We further demonstrate that a single low nanomolar dose of this 8-mer ASO substantially increases the levels of SMN and a host of factors including Gemin 2, Gemin 8, ZPR1, hnRNP Q and Tra2-beta1 known to be down-regulated in SMA. Our findings underscore the advantages and unmatched potential of very short ASOs in splicing modulation in vivo.

DOI of Published Version



RNA Biol. 2009 Jul;6(3):341-50. Epub 2009 Jul 14. Link to article on publisher's website

Journal/Book/Conference Title

RNA biology

Related Resources

Link to Article in PubMed

PubMed ID