Tracking epithelial cell junctions in C. elegans embryogenesis with active contours guided by SIFT flow.

Area of Science:

• Developmental biology
• Cell biology
• Biophysics

Background:

• Quantitative analysis of live cell shape is crucial for understanding development.
• Automated cell nuclei tracking is established, but cell surface tracking remains challenging.
• Cell junctions are key indicators of cell shape and position changes.

Purpose of the Study:

• To develop and compare novel methods for automated cell junction segmentation and tracking.
• To enable quantitative analysis of cell shape and movement in developing C. elegans epidermis.
• To provide the first quantitative description of epidermal cell dynamics during embryonic development.

Main Methods:

• Two novel approaches for cell junction segmentation were developed: a projection approach and a volumetric approach.
• Both methods utilize active contours and scale-invariant feature transform (SIFT) flow for tracking.
• Cell junctions were manually initiated and then automatically tracked throughout live C. elegans embryo development.

Main Results:

• The study presents the first quantitative description of ventral epidermal cell movements and shape changes.
• The developed methods successfully track cell junctions in 3-D space.
• The methods allow for detailed analysis of cell boundary dynamics during epidermal enclosure.

Conclusions:

• The developed junction tracking methods offer a powerful tool for quantitative cell biology.
• This work provides new insights into the mechanical processes governing embryonic development.
• Automated tracking of cell junctions opens new avenues for studying cell dynamics in live biological systems.