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An exonic enhancer is required for inclusion of an essential exon in the SMA-determining gene SMN

Lorson, C. L.·2000·Human Molecular Genetics

Abstract

The survival motor neuron genes, SMN1 and SMN2, encode identical proteins; however, only homo- zygous loss of SMN1 correlates with the development of spinal muscular atrophy (SMA). We have previously shown that a single non-polymorphic nucleotide difference in SMN exon 7 dramatically affects SMN mRNA processing. SMN1 primarily produces a full-length RNA whereas SMN2 expresses dramatically reduced full-length RNA and abundant levels of an aberrantly spliced transcript lacking exon 7. The importance of proper exon 7 processing has been underscored by the identification of several mutations within splice sites adjacent to exon 7. Here we show that an AG-rich exonic splice enhancer (ESE) in the center of SMN exon 7 is required for inclusion of exon 7. This region functioned as an ESE in a heterologous context, supporting efficient in vitro splicing of the Drosophila double-sex gene. Finally, the protein encoded by the exon-skipping event, Delta7, was less stable than full-length SMN, providing additional evidence of why SMN2 fails to compensate for the loss of SMN1 and leads to the development of SMA.

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Metadata

Authors
Lorson, C. L.
Venue
Human Molecular Genetics
Published
2000-01-22
Volume
9
Issue
2
Pages
259-265
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2137021233
Cited by
435
References
37
FWCI
15.03
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: An exonic enhancer is required for inclusion of an essential exon in the SMA-determining gene SMN. https://app.cochat.ai/papers/10.1093/hmg/9.2.259
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Lorson, C. L. (2000). An exonic enhancer is required for inclusion of an essential exon in the SMA-determining gene SMN. Human Molecular Genetics. https://doi.org/10.1093/hmg/9.2.259

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