3D-DIASemb: a computer-assisted system for reconstructing and motion analyzing in 4D every cell and nucleus in a...

Area of Science:

• Developmental Biology
• Cell Biology
• Biophysics

Background:

• Understanding cellular and nuclear dynamics during embryogenesis is crucial for developmental biology.
• Existing methods often lack the resolution or temporal detail to capture complex dynamic processes in live embryos.

Purpose of the Study:

• To develop and validate a novel computer-assisted system, 3D-DIASemb, for high-resolution 4D reconstruction and motion analysis of cells and nuclei in developing embryos.
• To demonstrate the system's capability in analyzing cellular lineages, nuclear dynamics, and cytoplasmic flow.

Main Methods:

• Utilized differential interference contrast microscopy to collect 75 optical sections (z-axis) of live embryos every 5 seconds.
• Developed beta-spline models from outlined cell and nuclear perimeters for 3D surface reconstruction.
• Implemented mathematical modeling to compute over 100 motility and morphology parameters and analyze cytoplasmic flow via vector flow plots.

Main Results:

• Successfully reconstructed and motion-analyzed a Caenorhabditis elegans embryo through the 28-cell stage.
• Demonstrated the ability to isolate and analyze individual cell or nuclear lineages.
• Quantified cellular and nuclear dynamics with high temporal resolution (as short as 5 seconds).

Conclusions:

• 3D-DIASemb provides a powerful new tool for comprehensive 4D analysis of cellular and nuclear dynamics in live developing embryos.
• The system facilitates the assessment of environmental perturbations, drug effects, and mutations on embryogenesis.
• Applicable to various embryonic systems beyond C. elegans, offering broad research potential.