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Published on: January 2, 2013
Understanding Human Cerebral Malaria through a Blood Transcriptomic Signature: Evidences for Erythrocyte Alteration,
Sandrine Cabantous1,2, Belco Poudiougou3, Aurélie Bergon4
1Aix Marseille Univ, INSERM, UMR906, GIMP, Labex ParaFrap, 13005 Marseille, France.
Insights
This study identified a blood RNA signature distinguishing cerebral malaria (CM) from uncomplicated malaria (UM) in children. Novel immune and neurodegenerative pathways were revealed, offering new insights into CM pathogenesis.
Area of Science:
- Genomics
- Immunology
- Neuroscience
Background:
- Cerebral malaria (CM) is a life-threatening condition in children with limited understanding of its underlying molecular mechanisms.
- Rapid assessment and treatment are crucial, but genetic and pathway insights remain incomplete.
Purpose of the Study:
- To identify key genes, proteins, and biological pathways involved in cerebral malaria (CM) pathogenesis.
- To differentiate molecular signatures between CM and uncomplicated malaria (UM) using transcriptomic analysis.
Main Methods:
- Whole blood transcriptomic analysis was performed on Malian children with CM and UM.
- Differential gene expression analysis, pathway analysis (IPA, KEGG), and network analysis were employed.
- Gene expression of selected genes and plasma levels of IP-10/CXCL10 and IL-18 were validated.
Main Results:
- A distinct blood RNA signature of 538 differentially expressed genes differentiated CM from UM.
- Identified pathways involved immune responses, erythrocyte alteration, and neurodegeneration.
- Found lower expression of CXCL10, IL18BP, and others, and higher expression of ARG1 and SLC6A9 in CM. Plasma IP-10/CXCL10 was lower, while IL-18 was higher in CM.
Conclusions:
- This study uncovered novel molecular factors and pathways critical to CM.
- Characterized biological pathways and upstream regulators contributing to CM.
- Findings provide new targets for understanding and potentially treating CM.
Background:
Cerebral malaria (CM), a reversible encephalopathy affecting young children, is a medical emergency requiring rapid clinical assessment and treatment. However, understanding of the genes/proteins and the biological pathways involved in the disease outcome is still limited.
Methods:
We have performed a whole transcriptomic analysis of blood samples from Malian children with CM or uncomplicated malaria (UM). Hierarchical clustering and pathway, network, and upstream regulator analyses were performed to explore differentially expressed genes (DEGs). We validated gene expression for 8 genes using real-time quantitative PCR (RT-qPCR). Plasma levels were measured for IP-10/CXCL10 and IL-18.
Results:
A blood RNA signature including 538 DEGs (∣FC | ≥2.0, adjusted P value ≤ 0.01) allowed to discriminate between CM and UM. Ingenuity Pathway Analysis (IPA) and Kyoto Encyclopedia of Genes and Genomes (KEGG) revealed novel genes and biological pathways related to immune/inflammatory responses, erythrocyte alteration, and neurodegenerative disorders. Gene expressions of CXCL10, IL12RB2, IL18BP, IL2RA, AXIN2, and NET were significantly lower in CM whereas ARG1 and SLC6A9 were higher in CM compared to UM. Plasma protein levels of IP-10/CXCL10 were significantly lower in CM than in UM while levels of IL-18 were higher. Interestingly, among children with CM, those who died from a complication of malaria tended to have higher concentrations of IP-10/CXCL10 and IFN-γ than those who recovered.
Conclusions:
This study identified some new factors and mechanisms that play crucial roles in CM and characterized their respective biological pathways as well as some upstream regulators.
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