A Spatial and Temporal Transcriptomic Atlas of Mouse Intestinal Regeneration

Area of Science:

• Gastroenterology
• Molecular Biology
• Regenerative Medicine

Background:

• The intestinal epithelium has significant regenerative potential after injury.
• Understanding the spatial and temporal aspects of intestinal injury and repair is crucial but incomplete.

Purpose of the Study:

• To create a detailed spatial and temporal atlas of the intestinal damage and repair response to ionizing radiation.
• To map molecular events driving epithelial recovery at high resolution.

Main Methods:

• Utilized spatial transcriptomics on mouse intestine samples over a six-day period.
• Analyzed mRNA expression of 19,042 genes across approximately 26 million bins at 2µm resolution.
• Examined samples spanning early apoptosis, tissue remodeling, and repair phases.

Main Results:

• Identified unique transcriptional patterns and niche signals missed by other methods, including non-random interferon-target gene activation.
• Observed temporal shifts in cytokine and growth factor gene expression, particularly in crypt and lower villus regions.
• Found global transcriptional upregulation (hypertranscription) in regenerating epithelium and altered cellular differentiation and villus patterning.

Conclusions:

• Generated a high-resolution spatiotemporal map of intestinal regeneration.
• Provided foundational data for future research into enhancing epithelial repair.
• Highlighted potential therapeutic targets for inflammatory bowel diseases, gastrointestinal pathologies, and cancer therapy side-effects.