Zebrafish skeleton development: High resolution micro-CT and FIB-SEM block surface serial imaging for phenotype...

Area of Science:

• Developmental Biology
• Biomineralization
• Zebrafish Models

Background:

• Bone formation mechanisms and skeletal development are complex and not fully understood.
• Zebrafish (Danio rerio) are a valuable model organism for studying vertebrate development due to their optical transparency and rapid embryonic development.

Purpose of the Study:

• To investigate the detailed process of skeletal development in zebrafish larvae.
• To characterize skeletal phenotypes and identify potential roles of novel structures in mineral storage.

Main Methods:

• Utilized calcein fluorescence, high-resolution micro-computed tomography (micro-CT) 3D imaging, and focused ion beam-scanning electron microscopy (FIB-SEM).
• Compared skeletal development in wild-type and nacre mutant zebrafish embryos up to 30 days post-fertilization.
• Quantified bone volumes and mineral content, including otoliths.

Main Results:

• Identified significant differences in skeletal development between wild-type and nacre mutant zebrafish.
• Observed mineralized aggregates within the notochord prior to axial skeleton ossification.
• Demonstrated the utility of high-resolution 3D imaging for characterizing skeletal phenotypes and developmental differences.

Conclusions:

• High-resolution 3D imaging techniques provide invaluable data for understanding zebrafish skeletal development.
• Mineralized aggregates in the notochord may play a role in mineral storage during early development.
• These advanced imaging approaches can aid in identifying and characterizing skeletal phenotypes.