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Expression microarray analysis implicates apoptosis and interferon-responsive mechanisms in susceptibility to
Fiona E Lovegrove1, Sina A Gharib, Samir N Patel
1Institute of Medical Science, University of Toronto, Toronto, ON, Canada M5G 2C4.
Abstract:
Specific local brain responses, influenced by parasite sequestration and host immune system activation, have been implicated in the development of cerebral malaria. This study assessed whole-brain transcriptional responses over the course of experimental cerebral malaria by comparing genetically resistant and susceptible inbred mouse strains infected with Plasmodium berghei ANKA. Computational methods were used to identify differential patterns of gene expression. Overall, genes that showed the most transcriptional activity were differentially expressed in susceptible mice 1 to 2 days before the onset of characteristic symptoms of cerebral malaria. Most of the differentially expressed genes identified were associated with immune-related gene ontology categories. Further analysis to identify interaction networks and to examine patterns of transcriptional regulation within the set of identified genes implicated a central role for both interferon-regulated processes and apoptosis in the pathogenesis of cerebral malaria. Biological relevance of these genes and pathways was confirmed using quantitative RT-PCR and histopathological examination of the brain for apoptosis. The application of computational biology tools to examine systematically the disease progression in cerebral malaria can identify important transcriptional programs activated during its pathogenesis and may serve as a methodological approach to identify novel targets for therapeutic intervention.
Insights
Researchers identified key immune gene expression changes in mice before cerebral malaria symptoms appear. Computational analysis revealed interferon and apoptosis pathways are crucial in disease development, offering potential therapeutic targets.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Cerebral malaria pathogenesis involves local brain responses, parasite sequestration, and host immune activation.
- Understanding whole-brain transcriptional changes is crucial for elucidating disease mechanisms.
Purpose of the Study:
- To assess whole-brain transcriptional responses during experimental cerebral malaria progression.
- To identify differential gene expression patterns in resistant versus susceptible mouse strains.
- To pinpoint key pathways and regulatory networks involved in cerebral malaria pathogenesis.
Main Methods:
- Comparative analysis of gene expression in resistant and susceptible mouse strains infected with Plasmodium berghei ANKA.
- Application of computational biology tools to identify differential gene expression patterns and interaction networks.
- Validation of identified genes and pathways using quantitative RT-PCR and histopathological examination for apoptosis.
Main Results:
- Significant transcriptional activity and differential gene expression observed in susceptible mice 1-2 days before symptom onset.
- Predominantly immune-related gene ontology categories were identified among differentially expressed genes.
- Interferon-regulated processes and apoptosis emerged as central to cerebral malaria pathogenesis.
Conclusions:
- Computational analysis of transcriptional data provides insights into cerebral malaria progression.
- Interferon signaling and apoptosis are critical pathways in the development of cerebral malaria.
- This approach can identify novel therapeutic targets for cerebral malaria intervention.
