Changes in differential gene expression during a fatal stroke.

Area of Science:

• Neuroscience
• Immunology
• Genetics

Background:

• Previous studies on gene expression in stroke often involve delayed blood sample collection, potentially missing early inflammatory responses.
• Understanding early genetic changes in ischemic stroke is crucial for distinguishing it from stroke mimics.

Purpose of the Study:

• To analyze differential gene expression over time in a young patient experiencing a fatal ischemic stroke, starting from symptom onset.
• To compare the patient's gene expression profile with that of an identical twin and healthy controls to identify early stroke-related genetic changes.

Main Methods:

• Blood samples were collected from the patient at multiple time points: Emergency Department arrival (T0), and 1, 3, and 24 hours post-arrival (T1, T3, T24).
• Gene expression analysis was performed using microarrays and compared to samples from an identical twin and two age/sex-matched healthy controls.
• Differential gene expression was assessed with a fold change cutoff of ±1.5.

Main Results:

• At T0, 12 messenger RNA (mRNA) were significantly upregulated in the patient compared to controls, with no downregulated mRNA.
• Granzyme B showed the highest upregulation at T0, decreasing over time. S100 calcium-binding protein A12 (S100A12) expression increased from T0 to T24.
• Genes like matrix metalloproteinase 9 and interleukin-18 receptor I were upregulated between T1-T3 and decreased by T24.

Conclusions:

• Early detection of specific gene expression patterns, such as granzyme B and S100A12, may aid in the rapid diagnosis of ischemic stroke.
• Temporal analysis of gene expression provides insights into the dynamic immunopathological processes during ischemic stroke evolution.
• Identifying early genetic biomarkers could improve the differentiation between true stroke events and stroke mimics.