Whole Blood Transcriptomics Identifies Subclasses of Pediatric Septic Shock

Area of Science:

• Pediatric critical care medicine
• Immunology
• Genomics

Background:

• Sepsis heterogeneity impedes effective therapy development.
• Precision medicine requires identifying biologically homogenous patient subgroups.
• Transcriptomic analysis offers a pathway to identify novel therapeutic targets.

Approach:

• Genome-wide expression profiling via RNA-sequencing was performed on whole blood samples from pediatric septic shock patients and controls.
• Hierarchical clustering of gene expression identified distinct septic shock subclasses.
• Clinical characteristics, inflammatory markers, cell compositions, and immune repertoires were compared between subclasses.

Key Points:

• Two distinct pediatric septic shock subclasses were identified based on gene expression patterns.
• Subclass 1 exhibited upregulated innate immunity and downregulated adaptive immunity pathways.
• Subclass 1 patients experienced worse clinical outcomes, elevated inflammatory cytokines, and endothelial injury biomarkers, despite similar initial illness severity.

Conclusions:

• Genome-wide expression profiling revealed two subclasses of pediatric septic shock with significant biological and clinical differences.
• These findings support a precision medicine approach for pediatric septic shock.
• Subclassifications may guide targeted therapeutic strategies for improved patient outcomes.