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Published on: April 10, 2013
Meta-Analysis of Microarray-Based Expression Profiles to Identify Differentially Expressed Genes in Intracranial
Zhe Xu1, Hao Li2, Jiangman Song3
1Monogenic Disease Research Center for Neurological Disorders, Beijing Tiantan Hospital, Capital Medical University, Beijing, China; Core Laboratory for Clinical Medical Research, Beijing Tiantan Hospital, Capital Medical University, Beijing, China; China National Clinical Research Center for Neurological Diseases, Beijing, China.
Molecular mechanisms of intracranial aneurysms (IAs) involve inflammation and immune responses contributing to formation. Angiogenesis and vascular remodeling roles in IA formation and rupture require further study.
Area of Science:
- Genomics
- Molecular Biology
- Vascular Biology
Background:
- Intracranial aneurysms (IAs) are complex vascular diseases.
- Understanding the molecular basis of IA formation and rupture is crucial for effective treatment strategies.
Purpose of the Study:
- To elucidate the molecular mechanisms underlying the formation and rupture of intracranial aneurysms (IAs).
Main Methods:
- Utilized Significance Analysis of Microarrays (SAM) on publicly available gene expression profiles of IAs.
- Performed functional annotation using Gene Ontology (GO) terms and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses.
- Validated key differentially expressed genes (DEGs) using quantitative polymerase chain reaction (qPCR).
Main Results:
- Identified 5232 significant DEGs across three microarray platforms, with MMP12 showing the highest upregulation.
- Found 1297 concordant DEGs, with upregulated genes enriched in inflammatory/immune responses and downregulated genes in smooth muscle cell pathways.
- Observed upregulation of angiogenic factors (HIF1A, VEGFA, ANGPTL4) in ruptured IAs, partially confirmed by qPCR.
Conclusions:
- Inflammation, immune response, and smooth muscle cell dysfunction are implicated in IA formation.
- The roles of angiogenesis and vascular remodeling in IA pathogenesis and rupture warrant further investigation.
