Characterizing Stroke Clots Using Single-Cell Sequencing

Area of Science:

• Immunology
• Genomics
• Neurology
• Cardiology

Background:

• Ischemic stroke causes significant morbidity and mortality.
• Understanding stroke clot composition can reveal disease mechanisms and identify stroke cause biomarkers.
• Examining gene expression in stroke clot cells provides critical insights.

Purpose of the Study:

• To analyze immune cell composition and gene expression in stroke clots.
• To compare stroke clots from patients with atrial fibrillation versus carotid atherosclerosis.
• To identify potential biomarkers for stroke cause and pathogenesis.

Main Methods:

• Single-cell RNA sequencing of 10 large vessel occlusion stroke clot samples.
• Comparison of immune cell profiles between atrial fibrillation and carotid atherosclerosis clots.
• Multi-marker Analysis of Genomic Annotation and GWAS to assess genetic associations.

Main Results:

• Distinct immune cell populations (monocytes, macrophages, neutrophils, T cells) were identified.
• Significant gene expression differences were observed in mononuclear phagocytic cells between stroke subtypes.
• Specific genes linked to atherosclerosis and stroke were identified; cytotoxic genes were upregulated in atrial fibrillation clots.

Conclusions:

• The study elucidates the immune and transcriptomic landscape within stroke clots.
• Identified differences provide potential biomarkers for stroke cause.
• This research lays the groundwork for future investigations into stroke pathogenesis.