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The Purkinje cell degeneration (pcd) mouse: an unexpected molecular link between neuronal degeneration and
1Department of Developmental Neurobiology, St Jude Children's Research Hospital, Memphis, TN 38105, USA.
Abstract:
The spontaneous autosomal recessive mouse mutation, Purkinje cell degeneration (pcd), was first identified through its ataxic behavior. Since its discovery in the 1970s, the strain has undergone extensive investigation, although another quarter century elapsed until the mutant gene (agtpbp1 a.k.a. Nna1) underlying the pcd phenotype was identified. As Nna1 was initially discovered as a gene induced in motor neurons following axotomy the finding that its loss leads to selective neuronal degeneration points to a novel and unexpected common molecular mechanism contributing to the apparently opposing processes of degeneration and regeneration. The elucidation of this mechanism may of course have significant implications for an array of neurological disorders. Here we will first review the principle features of the pcd phenotype and then discuss the functional implications of more recent findings emanating from the characterization of Nna1, the protein that is lost in pcd. We also provide new data on the genetic dissection of the cell death pathways operative in pcd(3J) mice, proving that granule cell death and Purkinje cell death in these mice have distinct molecular bases. We also provide new information on the structure of mouse Nna1 as well as Nna1 protein levels in pcd(3J) mice.
Insights
The Purkinje cell degeneration (pcd) mouse model reveals that the Nna1 gene is crucial for neuronal survival. Loss of Nna1 causes degeneration, suggesting a role in both neuronal death and regeneration.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- The Purkinje cell degeneration (pcd) mouse mutation, identified by its ataxic behavior, has been studied since the 1970s.
- The gene responsible for the pcd phenotype, agtpbp1 (Nna1), was identified decades after the initial discovery of the mutation.
- Nna1 was initially found to be induced in motor neurons after axotomy, indicating a potential role in neuronal repair.
Purpose of the Study:
- To review the key features of the pcd phenotype.
- To discuss the functional implications of recent findings on the Nna1 gene and its protein product.
- To present new data on the genetic basis of cell death pathways in pcd(3J) mice and Nna1 protein characteristics.
Main Methods:
- Phenotypic analysis of the pcd mouse model.
- Genetic dissection of cell death pathways in pcd(3J) mice.
- Molecular characterization of the Nna1 gene and protein, including structural analysis and expression levels.
Main Results:
- The loss of Nna1 leads to selective neuronal degeneration, suggesting a novel molecular mechanism linking degeneration and regeneration.
- Granule cell death and Purkinje cell death in pcd(3J) mice have distinct molecular underpinnings.
- New data on mouse Nna1 structure and Nna1 protein levels in pcd(3J) mice are presented.
Conclusions:
- Understanding the mechanism of Nna1 may offer insights into neurological disorders.
- The distinct molecular bases for granule and Purkinje cell death highlight the complexity of neuronal degeneration.
- Further characterization of Nna1 provides a foundation for exploring its role in neuronal health and disease.
