Expression of the SMN gene, the spinal muscular atrophy determining gene, in the mammalian central nervous system.

TitleExpression of the SMN gene, the spinal muscular atrophy determining gene, in the mammalian central nervous system.
Publication TypeJournal Article
Year of Publication1997
AuthorsBattaglia, G, Princivalle, A, Forti, F, Lizier, C, Zeviani, M
JournalHum Mol Genet
Date Published1997 Oct
KeywordsAmino Acid Sequence, Animals, Antibody Specificity, Base Sequence, Central Nervous System, COS Cells, Cyclic AMP Response Element-Binding Protein, DNA, Complementary, Gene Expression, HeLa Cells, Humans, Immunoenzyme Techniques, In Situ Hybridization, Macaca nemestrina, Male, Molecular Sequence Data, Muscular Atrophy, Spinal, Nerve Tissue Proteins, Rabbits, Rats, RNA, Messenger, RNA-Binding Proteins, SMN Complex Proteins, Survival of Motor Neuron 1 Protein

The survival motor neuron (SMN) gene is the putative disease gene for human spinal muscular atrophy (SMA), an autosomal recessive disorder characterized by progressive degeneration of lower motor neurons. Two copies of the gene, centromeric and telomeric, are present in the same 5q13 chromosomal region in humans. However, only the telomeric gene is affected in SMA. The SMN gene(s) encode(s) a novel protein of unknown function. To gain insights into the role of SMN in neurons, we have identified the SMN gene ortholog in the rat, and investigated SMN expression in the CNS of rat, monkey and humans by immunocytochemistry and in situ hybridization experiments. Antibodies against the SMN amino-terminus specifically recognized a single protein identical to the in vitro translation products of human and rat SMN cDNAs. The SMN gene transcript and product were widely but unevenly expressed throughout cerebral and spinal cord areas. The SMN protein was localized mainly in the cytoplasm of specific neuronal systems, and it was particularly expressed in lower motor neurons of newborn and adult animals. Likewise, a strong hybridization signal was detected in lamina IX of the spinal ventral horn. These results support the relevance of SMN for the motor neuron function and the pathogenetic role of the SMN gene in the neuronal degeneration associated with SMA.

Alternate JournalHum. Mol. Genet.
Citation Key10.1093/hmg/6.11.1961
PubMed ID9302277