Spinal muscular atrophy (SMA) results from loss of both telomeric 5q13 copies of the SMN1 gene. The centromeric 5q13 SMN2 gene encodes an identical protein. While loss of SMN2 does not lead to development of SMA, the presence of SMN2 acts as a disease modifier in a dose-dependent manner. The SMN1 gene produces a full-length transcript while the primary product of SMN2 is an exon-skipped mRNA lacking exon 7. The principal investigator that a single non-polymorphic nucleotide difference between SMN1 and SMN2 is the basis for this alternative splicing. By comparing hybrid SMN genes derived from SMA patients with unaffected relatives, the principal investigator and his group demonstrated that the origin of this nucleotide (SMN1 or SMN2) dictated clinical outcome. Therefore, the clinical evolution of SMA correlates with the splicing of SMN genes. They have also reported that the SMN protein self-associates and the protein translated from the alternative spliced SMN2 RNA have a reduced ability to form oligomers. Furthermore, SMN point mutants from SMA patients show defective oligomerization proportional to their disease severity. These studies have defined the genetic and biochemical basis for development of SMA.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS040275-06
Application #
6761783
Study Section
Special Emphasis Panel (ZRG1-BDCN-3 (01))
Program Officer
Gwinn, Katrina
Project Start
2000-07-01
Project End
2006-06-30
Budget Start
2004-07-01
Budget End
2006-06-30
Support Year
6
Fiscal Year
2004
Total Cost
$318,000
Indirect Cost
Name
University of Massachusetts Medical School Worcester
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
603847393
City
Worcester
State
MA
Country
United States
Zip Code
01655
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Singh, Natalia N; Androphy, Elliot J; Singh, Ravindra N (2004) An extended inhibitory context causes skipping of exon 7 of SMN2 in spinal muscular atrophy. Biochem Biophys Res Commun 315:381-8
Singh, Natalia N; Androphy, Elliot J; Singh, Ravindra N (2004) The regulation and regulatory activities of alternative splicing of the SMN gene. Crit Rev Eukaryot Gene Expr 14:271-85
Singh, Natalia N; Androphy, Elliot J; Singh, Ravindra N (2004) In vivo selection reveals combinatorial controls that define a critical exon in the spinal muscular atrophy genes. RNA 10:1291-305
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Monani, Umrao R; Pastore, Matthew T; Gavrilina, Tatiana O et al. (2003) A transgene carrying an A2G missense mutation in the SMN gene modulates phenotypic severity in mice with severe (type I) spinal muscular atrophy. J Cell Biol 160:41-52
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Zhang, M L; Lorson, C L; Androphy, E J et al. (2001) An in vivo reporter system for measuring increased inclusion of exon 7 in SMN2 mRNA: potential therapy of SMA. Gene Ther 8:1532-8

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