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Characterization of the human analogue of a Scrapie-responsive gene
M Dron1, F Dandoy-Dron, F Guillo
1Laboratory of Viral Oncology CNRS UPR 9045, IFC1, 94801 Villejuif cedex, France. mdron@infobiogen.fr
Abstract:
We have recently described a novel mRNA denominated ScRG-1, the level of which is increased in the brains of Scrapie-infected mice (Dandoy-Dron, F., Guillo, F., Benboudjema, L., Deslys, J.-P., Lasmézas, C., Dormont, D., Tovey, M. G., and Dron, M. (1998) J. Biol. Chem. 273, 7691-7697). The increase in ScRG-1 mRNA in the brain follows the accumulation of PrPSc, the proteinase K-resistant form of the prion protein (PrP), and precedes the widespread neuronal death that occurs in late stage disease. In the present study, we have isolated a cDNA encoding the human counterpart of ScRG-1. Comparison of the human and mouse transcripts firmly established that both sequences encode a highly conserved protein of 98 amino acids that contains a signal peptide, suggesting that the protein may be secreted. Examination of the distribution of human ScRG-1 mRNA in adult and fetal tissues revealed that the gene was expressed primarily in the central nervous system as a 0.7-kilobase message and was under strict developmental control.
Insights
Researchers identified the human ScRG-1 gene, a conserved protein involved in prion diseases. Its expression in the central nervous system is developmentally regulated, offering insights into scrapie pathogenesis.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- A novel mRNA, ScRG-1, was previously identified and found to be upregulated in the brains of scrapie-infected mice.
- ScRG-1 mRNA levels increase following PrPSc accumulation and precede neuronal death in late-stage scrapie disease.
Purpose of the Study:
- To isolate and characterize the human counterpart of the ScRG-1 gene.
- To investigate the conservation and expression pattern of the human ScRG-1 gene.
Main Methods:
- cDNA isolation and sequencing to identify the human ScRG-1 gene.
- Comparative sequence analysis between human and mouse ScRG-1.
- mRNA distribution analysis in adult and fetal human tissues using Northern blotting.
Main Results:
- A cDNA encoding the human ScRG-1 protein was successfully isolated.
- Human and mouse ScRG-1 proteins are highly conserved, consisting of 98 amino acids with a predicted signal peptide.
- Human ScRG-1 mRNA is predominantly expressed in the central nervous system as a 0.7-kilobase transcript.
- Gene expression exhibits strict developmental regulation.
Conclusions:
- The human ScRG-1 gene encodes a conserved, potentially secreted protein.
- ScRG-1 is primarily expressed in the central nervous system and its expression is tightly controlled during development.
- These findings contribute to understanding the molecular mechanisms underlying prion diseases like scrapie.