Potent and selective antisense oligonucleotides targeting single-nucleotide polymorphisms in the Huntington disease gene / allele-specific silencing of mutant huntingtin

Research output: Contribution to journalJournal articleResearchpeer-review

Jeffrey B Carroll, Simon C Warby, Amber L Southwell, Crystal N Doty, Sarah Greenlee, Niels Skotte, Gene Hung, C Frank Bennett, Susan M Freier, Michael R Hayden

Huntington disease (HD) is an autosomal dominant neurodegenerative disorder caused by CAG-expansion in the huntingtin gene (HTT) that results in a toxic gain of function in the mutant huntingtin protein (mHTT). Reducing the expression of mHTT is therefore an attractive therapy for HD. However, wild-type HTT protein is essential for development and has critical roles in maintaining neuronal health. Therapies for HD that reduce wild-type HTT may therefore generate unintended negative consequences. We have identified single-nucleotide polymorphism (SNP) targets in the human HD population for the disease-specific targeting of the HTT gene. Using primary cells from patients with HD and the transgenic YAC18 and BACHD mouse lines, we developed antisense oligonucleotide (ASO) molecules that potently and selectively silence mHTT at both exonic and intronic SNP sites. Modification of these ASOs with S-constrained-ethyl (cET) motifs significantly improves potency while maintaining allele selectively in vitro. The developed ASO is potent and selective for mHTT in vivo after delivery to the mouse brain. We demonstrate that potent and selective allele-specific knockdown of the mHTT protein can be achieved at therapeutically relevant SNP sites using ASOs in vitro and in vivo.

Original languageEnglish
JournalMolecular therapy : the journal of the American Society of Gene Therapy
Volume19
Issue number12
Pages (from-to)2178-85
Number of pages8
ISSN1525-0016
DOIs
Publication statusPublished - Dec 2011

    Research areas

  • Alleles, Animals, Brain, Cells, Cultured, Female, Fibroblasts, Gene Silencing, Genetic Therapy, Humans, Huntingtin Protein, Huntington Disease, Male, Mice, Mice, Transgenic, Mutant Proteins, Nerve Tissue Proteins, Neurons, Nuclear Proteins, Oligonucleotides, Antisense, Pedigree, Polymorphism, Single Nucleotide, RNA, Messenger, Serotonin Plasma Membrane Transport Proteins, Trinucleotide Repeat Expansion, Journal Article, Research Support, Non-U.S. Gov't

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