NDLI: Bifunctional antisense oligonucleotides provide a trans-acting splicing enhancer that stimulates SMN2 gene expression in patient fibroblasts.

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Bifunctional antisense oligonucleotides provide a trans-acting splicing enhancer that stimulates SMN2 gene expression in patient fibroblasts.

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Bifunctional antisense oligonucleotides provide a trans-acting splicing enhancer that stimulates SMN2 gene expression in patient fibroblasts.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yue, Baigong Muntoni, Francesco Skordis, Leigh A. Eperon, Ian C. Dunckley, Matthew G.
Description	Author Affiliation: Skordis LA ( Dubowitz Neuromuscular Centre, Imperial College London, Hammersmith Hospital, London W12 0NN, United Kingdom.);
Abstract	The multiplicity of proteins compared with genes in mammals owes much to alternative splicing. Splicing signals are so subtle and complex that small perturbations may allow the production of new mRNA variants. However, the flexibility of splicing can also be a liability, and several genetic diseases result from single-base changes that cause exons to be skipped during splicing. Conventional oligonucleotide strategies can block reactions but cannot restore splicing. We describe here a method by which the use of a defective exon was restored. Spinal muscular atrophy (SMA) results from mutations of the Survival Motor Neuron (SMN) gene. Mutations of SMN1 cause SMA, whereas SMN2 acts as a modifying gene. The two genes undergo alternative splicing with SMN1, producing an abundance of full-length mRNA transcripts, whereas SMN2 predominantly produces exon 7-deleted transcripts. This discrepancy is because of a single nucleotide difference in SMN2 exon 7, which disrupts an exonic splicing enhancer containing an SF2ASF binding site. We have designed oligoribonucleotides that are complementary to exon 7 and contain exonic splicing enhancer motifs to provide trans-acting enhancers. These tailed oligoribonucleotides increased SMN2 exon 7 splicing in vitro and rescued the incorporation of SMN2 exon 7 in SMA patient fibroblasts. This treatment also resulted in the partial restoration of gems, intranuclear structures containing SMN protein that are severely reduced in patients with SMA. The use of tailed antisense oligonucleotides to recruit positively acting factors to stimulate a splicing reaction may have therapeutic applications for genetic disorders, such as SMA, in which splicing patterns are altered.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	7
Volume Number	100
Language	English
Publisher	National Academy of Sciences
Publisher Date	2003-04-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Alternative Splicing Enhancer Elements, Genetic Gene Expression Regulation Physiology Muscular Atrophy, Spinal Genetics Nerve Tissue Proteins Oligodeoxyribonucleotides, Antisense Pharmacology Transcriptional Activation Cyclic AMP Response Element-Binding Protein DNA Primers Exons Fibroblasts Drug Effects RNA, Messenger RNA-Binding Proteins Reverse Transcriptase Polymerase Chain Reaction SMN Complex Proteins Sequence Deletion Survival Of Motor Neuron 1 Protein Survival Of Motor Neuron 2 Protein Transcription, Genetic Transfection Research Support, Non-U.S. Gov't Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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