Gene expression detection in developing mouse tissue using in situ hybridization and µCT imaging.

Area of Science:

• Biomedical Imaging
• Developmental Biology
• Molecular Biology

Background:

• Soft-tissue X-ray microtomography (µCT) is a powerful 3D imaging technique for morphology and development.
• A key limitation is the lack of molecular probes for visualizing gene activity with µCT.

Purpose of the Study:

• To develop a novel method for 3D visualization of gene expression in developing tissues using µCT.
• To establish gene expression CT (GECT) by combining in situ hybridization with enhanced metal deposition and µCT.

Main Methods:

• Horseradish peroxidase-assisted reduction of silver and catalytic gold enhancement were applied to in situ hybridization.
• Gene expression patterns were detected for collagen type II alpha 1 and sonic hedgehog in developing mouse tissues.
• Expression patterns were visualized using laboratory µCT.

Main Results:

• GECT successfully detected gene expression patterns comparable to alkaline phosphatase-based methods.
• The method demonstrated compatibility with varying gene expression levels and region sizes.
• GECT was shown to be compatible with phosphotungstic acid staining for enhanced contrast in µCT.

Conclusions:

• Gene expression CT (GECT) is a viable method for 3D detection of gene expression in developing tissues.
• GECT integrates with existing laboratory routines for spatially accurate imaging.
• This technique expands the utility of µCT for molecular and developmental studies.