Rapid 3-dimensional imaging of embryonic craniofacial morphology using microscopic computed tomography

Area of Science:

• Developmental biology
• Imaging science
• Toxicology

Background:

• Microscopic computed tomography (microCT) is used for 3D imaging of mouse embryos.
• Existing methods require toxic osmium tetroxide processing.
• Rapid and safe embryo imaging is needed for morphological evaluation.

Purpose of the Study:

• To develop a modified, rapid 3D embryonic microCT technique.
• To eliminate the need for osmium tetroxide in embryo processing.
• To assess the utility of this technique for evaluating craniofacial anomalies.

Main Methods:

• Mouse embryos (days 10.5-11), both normal and teratogen-induced craniofacial anomalies, were fixed.
• Samples were processed using hexamethyldisilazane (HMDS) instead of osmium tetroxide.
• 3D microCT imaging was performed on processed embryos.

Main Results:

• The modified protocol produced clear 3D craniofacial images of normal and anomalous mouse embryos.
• Imaging was completed rapidly, within 20 minutes to 1 hour.
• Key anatomical landmarks were identifiable in reconstructed images.

Conclusions:

• The rapid, osmium tetroxide-free microCT technique is effective for 3D embryonic imaging.
• This method facilitates clear visualization of craniofacial structures and anomalies.
• MicroCT shows potential for high-throughput morphological screening of mouse embryos with craniofacial defects.